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Datasheet
AS1302
5V/30mA Adaptive Inductorless Boost Converter
1 General Description
The AS1302 is a 30mA inductorless boost converter using a double H-bridge charge-pump topology with two external flying capacitors. The AS1302 charge pump features 1:2 and 2:3 operation modes as well as a 1:1 operation mode where the input is directly connected to the output. The AS1302 runs on a 1.2MHz fixed frequency and is utilized with a low noise regulation scheme to allow usage together with sensitive RF circuitry from the same battery supply. Additionally to increase efficiency the AS1302 switches to 49kHz at light loads. Designed to reside in portable and space limited equipment the 1.2MHz charge pump converts a 2.9V to 5.15V input to regulated 5V output with 3% accuracy. The shutdown function reduces the supply current to <1A and disconnects the load from the output. The integrated soft-start circuitry prevents high inrush currents being drawn from the battery during start-up. The AS1302 includes built-in under-voltage lockout, short circuit-, and thermal protection circuitry. The AS1302 is available in TDFN (3x3x0.8mm) 10-pin and an extremely small 1.2x1.2mm WL-CSP 8-bumps package with 0.4mm pitch.
2 Key Features
! ! ! ! ! ! ! ! ! ! ! !
Up to 90% Efficiency 2.9V to 5.15V Input Voltage Regulated 5V Output Automatic Mode Switching <1A Shutdown Current Startup with Full Load (within 1ms) Up to 30mA Load Current Short Circuit Protection Output Disconnected During Shutdown Soft-Start No Inductor Required Small External Components Required (COUT =2.2F, CFLY =220nF) Low Noise Fixed Frequency (1.2MHz, 49kHz) Charge Pump: - 1:1 Battery Feed Through Mode - 2:3 Single Phase Mode - 1:2 Single Phase Mode Package Options: - TDFN (3x3x0.8mm) 10-pin - WL-CSP 8-bumps with 0.4mm Pitch
!
!
3 Applications
The device is ideal for two or three AA cells or a single Li-Ion battery cell to 5V conversion, mobile phones, portable instruments, microprocessor based systems and remote data-acquisition systems. Figure 1. AS1302 - Typical Application Diagram
CFLY1 220nF C1+ VBATT 2.9V to 5.15V VBATT CBAT 2.2F On Off EN C2+ CFLY2 C2220nF C1VOUT VOUT = 5V COUT 2.2F GND
AS1302
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AS1302
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Through View)
C1GND 1 C1- 2 NC 3 C1+ 4 GND VOUT 5 6 C2+ TDFN (3x3x0.8mm) 10-pin 10 EN 9 VBATT
A1
GND
A2
EN
A3
AS1302
8 C27 NC
C1+
B1
B3
VBATT
C1
C2
C3
VOUT C2+ C2WL-CSP 8-bumps
Pin Descriptions
Table 1. Pin Descriptions Pin Name C1GND EN C1+ VBATT VOUT C2+ C2Pin Number A1 A2 A3 B1 B3 C1 C2 C3 Description Connector 1-. Negative terminal of flying cap 1. Ground. Enable. (operating if EN = 1). Set this digital input to logic high for normal operation. For shutdown, set to logic low. Connector 1+. Positive terminal of flying cap 1. +2.9V to 5.15V Input Voltage. Bypass this pin to GND with a 2.2F low ESR ceramic capacitor. +5V Output Voltage. This pin must be bypassed with a 2.2F low ESR ceramic capacitor. Connector 2+. Positive terminal of flying cap 2. Connector 2-. Negative terminal of flying cap 2.
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AS1302
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Section 6 Electrical Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2. Absolute Maximum Ratings Parameter All pins to GND Operating Temperature Range Storage Temperature Range ESD Min -0.3 -40 -65 2 500 Max +7.0 +85 +125 Units V C C kV V HBM MIL-Std. 883E 3015.7 methods CDM JESD22-C101C methods The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD020D "Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices". The lead finish for Pb-free leaded packages is matte tin (100% Sn). Notes
Package Body Temperature
+260
C
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AS1302
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
VBATT = 2.9V to 5.15V, VOUT = 5V, COUT = CBAT = 2.2F, CFLY1 = CFLY2 =220nF, TAMB = -40 to +85C. Typical values are at TAMB = +25C and VIN = 3.3V, unless otherwise specified. Table 3. Electrical Characteristics Symbol Parameter Conditions Rising VBATT Falling VBATT 2.4 2.9 IOUT = 0mA, 15mA VBATT = 5.4V, IOUT = 10~30mA VBATT = 4.3V, IOUT = 10~30mA VBATT = 3.3V, IOUT = 10~30mA 1:1 / 2:3 mode, falling VBATT Mode Switching Voltage 2:3 / 1:2 mode, falling VBATT Mode switching voltage hysteresis IOUT Vripple Iinr Ishort 12 Efficiency in Switching Mode 23 IOP12 IOP23 IOP11 IOFF VIH VIL Timing fOSC tSTART TOFF Oscillator Frequency Startup Time VBATT = 3.6V, IOUT = 30mA VBATT = 3.6V, IOUT = 2mA 0.9 40 1.2 49 0.5 1.5 65 1 MHz kHz ms Shutdown Current Operating Quiescent Current Load Current
1
Min
Typ 2.8 2.5
Max 2.9 2.8 5.15
Units V V V V
VBATT(on) Undervoltage Lockout VBATT(off) Undervoltage Lockout VBATT VOUT Battery Supply Voltage Output Voltage Accurracy
4.85
5.0 2 3 3 5.1
5.15
VO/IO11 Load Regulation in 1:1 Mode VO/IO23 Load Regulation in 2:3 Mode VO/IO12 Load Regulation in 1:2 Mode Vtgr11/23 Vtgr23/12
mV/mA
V 3.6 150 30 mV mA mVPP mVPP 150 150 mA mA % % 300 230 150 1 A A
VBATT = 3.6V, IOUT = 30mA Output Voltage Ripple VBATT = 3.6V, IOUT = 2mA Inrush Current
2
22 40
Short-Circuit Current 1:2 mode, VBATT = 2.9V, IOUT = 30mA 2:3 mode, VBATT = 3.8V, IOUT = 30mA VBATT = 3.4V (1:2 mode without load) VBATT = 4.5V (2:3 mode without load) VBATT = 5.3V (1:1 mode without load) EN = 0V 85 85 240 170 100 0.01
Input Levels Input High Level Input Low Level pin EN 1.1 0.0 5.5 0.4 V V
Thermal Regulation Temperature Shutdown Temperature rising Hysteresis 1. The device is tested in a proprietary test mode. 2. The inrush current is limited by the internal soft-start circuitry. 145 10 C
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AS1302
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
VBATT = 3.3V, VOUT = 5V, COUT = CBAT = 2.2F, CFLY1 = CFLY2 =220nF, TAMB = +25C, unless otherwise specified.
Figure 3. Efficiency vs. Input Voltage; ILOAD = 1mA
100 90 80
Figure 4. Efficiency vs. Input Voltage; ILOAD = 10mA
100 90 80
Efficiency (%)
60 50 40 30 20 10 0 2.6 3 3.4 3.8 4.2 4.6 5 5.4
1:2 mode 2:3 mode 1:1 mode
Efficiency (%)
70
70 60 50 40 30 20 10 0 2.6 3 3.4 3.8 4.2 4.6 5 5.4
1:2 mode 2:3 mode 1:1 mode
Input Voltage (V) Figure 5. Efficiency vs. Input Voltage; ILOAD = 20mA
100 90 80
Input Voltage (V) Figure 6. Efficiency vs. Input Voltage; ILOAD = 30mA
100 90 80
Efficiency (%)
60 50 40 30 20 10 0 2.6 3 3.4 3.8 4.2 4.6 5 5.4
1:2 mode 2:3 mode 1:1 mode
Efficiency (%)
70
70 60 50 40 30 20 10 0 2.6 3 3.4 3.8 4.2 4.6 5 5.4
1:2 mode 2:3 mode 1:1 mode
Input Voltage (V) Figure 7. Quiescent Current vs. Input Voltage
300 275
Input Voltage (V) Figure 8. Quiescent Current vs. Temperature
300
Vi n=3.4V (1:2 Mode)
275
Vi n=4.5V (2:3 Mode) Vi n=5.3V (1:1 Mode)
Quiescent Current (A)
225 200 175 150 125 100 75 50 2.4 2.9 3.4 3.9 4.4 4.9 5.4
Quiescent Current (A)
250
250 225 200 175 150 125 100 75
50 -45 -30 -15
0
15
30
45
60
75
90
Input Voltage (V) www.austriamicrosystems.com Revision 1.02
Temperature (C) 5 - 18
AS1302
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 9. Efficiency vs. Output Current; VBATT = 2.9V
100 90 80
Figure 10. Efficiency vs. Output Current; VBATT = 3.3V
100 90 80
Efficiency (%)
60 50 40 30 20 10 0 0.1 1
Efficiency (%)
70
49kHz 1.2MHz
70 60 50 40 30 20 10 0
49kHz 1.2MHz
10
100
0.1
1
10
100
Output Current (mA)
Output Current (mA)
Figure 11. Efficiency vs. Output Current; VBATT = 3.6V
100 90 80
Figure 12. Efficiency vs. Output Current; VBATT = 4V
100 90 80
Efficiency (%)
60
49kHz 1.2MHz
Efficiency (%)
70
70 60 50 40 30 20 10 0
49kHz 1.2MHz
50 40 30 20 10 0 0.1 1 10 100
0.1
1
10
100
Output Current (mA)
Output Current (mA)
Figure 13. Efficiency vs. Output Current; VBATT = 4.3V
100 90 80
Figure 14. Efficiency vs. Output Current; VBATT = 5.4V
100 90 80
permanent 1:1 Mode
Efficiency (%)
60 50 40 30 20 10 0 0.1
Efficiency (%)
100
70
49kHz 1.2MHz
70 60 50 40 30 20 10 0
1
10
0.1
1
10
100
Output Current (mA)
Output Current (mA)
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AS1302
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 15. Output Voltage vs. Output Current
5.15 5.1
Figure 16. Output Voltage vs. Output Current
5.15 5.1
49kHz
1.2MHz
49kHz
1.2MHz
Output Voltage (V)
5.05 5 4.95 4.9 4.85 0.01
Vi n = 2.9V Vi n = 3.3V Vi n = 4.3V
Output Voltage (V)
5.05 5 4.95 4.9 4.85 0.01
Vi n = 3.0V Vi n = 3.6V Vi n = 4.0V
0.1
1
10
100
0.1
1
10
100
Output Current (mA)
Output Current (mA)
Figure 17. Output Voltage vs. Input Voltage
5.15 5.1
1:2 mode 2:3 mode 1:1 mode
Figure 18. Output Voltage vs. Temperature
5.15 5.1
5.05 5 4.95 4.9 4.85 2.9 3.2 3.5 3.8 4.1 4.4 4.7 5
Iout = 4mA
Output Voltage (V)
Output Voltage (V)
5.05 5 4.95 4.9 4.85 -45 -30 -15
Iout = 0.1mA Iout = 10mA Iout = 30mA
Iout = 10mA Iout = 20mA Iout = 30mA
5.3
0
15
30
45
60
75
90
Input Voltage (V)
Temperature (C)
Figure 19. Startup Time vs. Input Voltage; load=166
1 0.875
Startup Time (ms)
0.75 0.625 0.5 0.375 0.25 0.125 0 2.9 3.15 3.4 3.65 3.9 4.15 4.4 4.65 4.9
Input Voltage (V)
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AS1302
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 20. Turn-ON / Turn-OFF Time @ load = 166
Figure 21. Inrush Current; no load
2V/Div
VOUT
1V/Div
EN
VOUT
200s/Div
50s/Div
Figure 22. Switching Frequency vs. Input Voltage; IOUT = 2mA
65
Figure 23. Switching Frequency vs. Input Voltage; IOUT = 20mA
1.5
Switching Frequency (MHz)
Switching Frequency (kHz)
60
1.4 1.3 1.2 1.1 1 0.9
55
50
45
40 2.9 3.2 3.5 3.8 4.1 4.4 4.7 5
2.9
3.2
3.5
3.8
4.1
4.4
4.7
Input Voltage (V)
Figure 24. Switching Frequency vs. Temperature; IOUT = 2mA
65
Input Voltage (V)
Figure 25. Switching Frequency vs. Temperature; IOUT = 20mA
1.5
Switching Frequency (MHz)
Switching Frequency (kHz)
60
1.4 1.3 1.2 1.1 1 0.9 -45 -30 -15
55
50
45
40 -45 -30 -15
0
15
30
45
60
75
90
0
15
30
45
60
75
Temperature (C) www.austriamicrosystems.com Revision 1.02
Temperature (C) 8 - 18
2V/Div
EN
2V/Div
50mA/Div
Iinr
5
90
AS1302
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 26. Load Transient; Mode = 1:1, IOUT = 30 to 10 to 30 mA
Figure 27. Load Transient; Mode = 2:3, IOUT = 30 to 10 to 30 mA
30mA
IOUT
10mA
IOUT
50mV/Div
500s/Div
500s/Div
Figure 28. Load Transient; Mode = 1:2, IOUT = 30 to 10 to 30 mA
Figure 29. Load Transient; Mode = 1:2, IOUT = 20 to 4 to 20 mA
30mA
IOUT
IOUT
10mA
50mV/Div
500s/Div
500s/Div
Figure 30. Line Transient
Figure 31. Output Ripple
20mV/Div - BW=20MHZ 10s/Div 1V/Div
3.8V 4.8V
VIN
5mV/Div
VOUT
5ms/Div
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VOUT
50mV/Div
VOUT
VOUT
4mA
20mA
50mV/Div
VOUT
VOUT
10mA
30mA
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AS1302
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
Functional Description
The AS1302 is a high efficiency and low noise switched capacitor DC-DC converter that is capable of boost operation. It is equipped with two built-in coupled H-bridge type switch configurations. Based on the value of the output voltage the system automatically initiates mode-switching to achieve the highest possible efficiency. The regulation of the output voltage is achieved by a regulation loop, which modulates the current drive capability of the power transistors so that the amount of charge transferred from the input to the output at each clock cycle is controlled and is equal to the charge needed by the load.
Regulation Loop
The AS1302 operates at a constant frequency. For the regulation loop power transistors, a resistor divider and an error amplifier are used to keep the output voltage within the allowed limits. The error amplifier takes the feedback and reference signals as inputs and generates the error voltage signal. The error voltage controls a driver that triggers the gate voltage of the power transistor which modulates the current drive capability of the power amplifier. The modulated transistor controls the charge transferred from the input to the output and therefore the regulation of the output is realized. This regulation concept which is based on adjusting the amount of charge transferred, delivers the smallest voltage ripple possible.
Figure 32. AS1302 - Functional Block Diagram
CFLY1 C1CFLY2 C2+ C2VOUT COUT
C1+ VBATT + CBAT
Double-H Bridge Topology
Vmode
Vctrl
i ( t ) dt
Softstart
Mode Select State Machine & Control Logic Temp
Ref Bias
POR
CLK On Off EN
AS1302
GND
Light/Heavy Load Monitor
To detetect the output current in the 2:3 and in the 1:2 mode, a current sense is used. The device switches to a lower switching frequency (49kHz typ), due to a detected light-load condition. With this frequency an excellent light-load efficiency is achieved and no audible noise is generated. If the load is increasing (typically more than 3mA), the device operates at 1.2MHz.
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AS1302
Datasheet - D e t a i l e d D e s c r i p t i o n
Switch Configuration
The AS1302 has nine built-in power switches in the shape of two coupled H-bridge topologies. The system features 1:2 and 2:3 operation modes as well as a 1:1 operation where the input is directly connected to the output. In 2:3 operation mode two flying capacitors are placed in series and each capacitor is charged to the half of the input voltage. In pumping phase the flying capacitors are placed in parallel. The bottom-plates of the parallel flying capacitors CFLY1 and CFLY2 are connected to the input voltage so that the voltage at the top-plates of the flying capacitors is boosted to a voltage equal to VBATT + VBATT/2. By connecting the top-plates of the capacitors to the output, the output voltage in the 2:3 mode can be up to one and a half of VBATT. If the top-plate voltage is higher than 5V, the regulation loop adapts the power transistor's on-resistance to drop some voltage.
Figure 33. 2:3 Operating Mode
Charging Phase VOUT +5V SW1 VBATT +2.9V to 5.15V SW2 CFLY1 CFLY2 SW3 SW4 SW4 VBATT +2.9V to 5.15V SW2 CFLY1 CFLY2 SW3 SW1 Pumping Phase VOUT +5V
In 1:2 operation both flying capacitors are placed in parallel to the input voltage, and therefore charged to the input voltage. During pumping phase the input voltage is connected to the bottom of the charged flying capacitors. The voltage at the top-plates of the parallel capacitors is now boosted to 2VBATT. By connecting the top-plates of the capacitors to the output, the output can be charged to twice the voltage of VBATT. If the top-plate voltage is higher than 5V the regulation loop limits the charge transfer to the output.
Figure 34. 1:2 Operating Mode
Charging Phase VOUT +5V SW1 VBATT +2.9V to 5.15V SW2 CFLY1 CFLY2 SW3 SW4 SW4 VBATT +2.9V to 5.15V SW2 CFLY1 CFLY2 SW3 SW1 Pumping Phase VOUT +5V
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AS1302
Datasheet - D e t a i l e d D e s c r i p t i o n
Soft-start
The soft-start circuit prevents the supply from high inrush currents caused by the converter's power-up sequence. During the soft-start (0.5ms typ) the device limits the inrush current. The device is capable to power-up at the minimum specified battery voltage and with the maximum load (ohmic equivalent) applied to the output.
Undervoltage Lockout, UVLO
The AS1302 is equipped with an undervoltage lockout functionality. If the battery voltage drops below 2.5V (typ) the device enters the undervoltage lockout condition. The device remains in this condition until the battery voltage is high enough to enter the soft start sequence. An internal hysteresis of 300mV prevents ringing during startup. If the input voltage increases to 2.8V (typ) again after such a condition the device turns-on automatically.
Shutdown Mode
The AS1302 enters low-power shutdown mode when EN is set to logic low. In shutdown the charge-pump action is halted, the output is completely disconnected from the input and VOUT will drop to 0V.
Short-Circuit Protection
Short-circuit protection prevents damage to the device if the output is shorted to ground. Whenever the output voltage is pulled significantly below VBATT, short-circuit protection is triggered and limits the current. As soon as VOUT recovers the protection is released and the device enters soft-start mode.
Thermal Shutdown
The AS1302 offers thermal shutdown, which prevents damage due to an over-temperature condition. Thermal shutdown will be initiated if the junction temperature exceeds 145C. If the temperature drops below this value, the thermal shutdown will be released automatically and the device resumes operation. A hysteresis prevents the thermal shutdown from oscillating.
Efficiency Consideration
In the 2:3 operation mode the input current of the charge pump is approximately 1.5x the load current. In an ideal charge pump the efficiency can be calculated by:
V OUT V OUT x I OUT P OUT = ------------- = ------------------------------------------- = -----------------------V BATT x 1, 5I OUT P IN 1, 5V BATT
(EQ 1)
The same works for the 1:2 operation mode. The input current of the charge pump is approximately 2x the load current. The efficiency of a charge pump in 1:2 operation mode can be calculated by:
V OUT V OUT x I OUT P OUT = ------------- = ------------------------------------- = -----------------P IN 2V BATT V BATT x 2I OUT
(EQ 2)
For typical and high output power conditions the quiescent current and the switching losses are negligible and (EQ 1) and (EQ 2) are valid. Hence, with the same input Voltage the 2:3 operation mode will result into a higher efficiency than the 1:2 operation mode.
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AS1302
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
External Component Selection
The high internal oscillator frequency of 1.2MHz permits the use of small capacitors for both, the flying capacitors and the output capacitors. For any given load the value of the flying- and output capacitors as well as their ESR are affecting the output voltage performance. In general, the capacitor's ESR is inversely proportional to its physical size. Larger capacitances and higher voltage ratings tend to reduce ESR. The ESR is a function of the frequency too, so it must be rated at the devices operating frequency. Another factor affecting capacitor ESR is temperature.
Note: Many capacitors have a huge capacity variation over temperature. This can be compensated by choosing a capacitor with a better thermal coefficient or by choosing a larger nominal value to ensure proper operation over temperature.
It is not critical which type of input bypass capacitor CBAT and output filter capacitor COUT is used, but it will affect the performance of the charge pump. Low ESR capacitors should be used to minimize VOUT ripple. Multi-layer ceramic capacitors are recommended since they have extremely low ESR and are available in small footprints.
Input Capacitor
A 2.2F input bypass low ESR capacitor such as tantalum or ceramic is recommended to reduce noise and supply transients. During startup and mode change it supplies a part of the peak input current drawn by the device.
Output Capacitor
The output capacitor is charged to VOUT during the pumping phase. The ESR of the output capacitor introduces spikes in the output voltage waveform whenever the charge pump charges COUT. These spikes contribute to the ripple voltage of VOUT. Therefore, ceramic or tantalum low ESR capacitors are recommended for COUT to minimize the output voltage ripple.
Table 4. Recommended Input and Output Capacitors Part Number C TC Code Rated Voltage Dimensions Manufacturer Murata www.murata.com
GRM188R61C225KE15 GRM21BR71E225KA73 GRM188R60J475KE19 GRM188R60J106ME47
2.2F 2.2F 4.7F 10F
X5R X7R X5R X5R
16V 25V 6.3V 6.3V
0603 0805 0603 0603
Figure 35. Load Regulation Comparision with different Capacitors
5.15 5.1 5.05 5 4.95 4.9 4.85 0 5 10 15 20 25 30
2.2F 16V 0603 2.2F 25V 0805 4.7F 6.3V 0603 10F 6.3V 0603
Figure 36. Output Ripple vs. Output Current Comparision with different Capacitors
100
2.2F 16V 0603
49kHz
1.2MHz
2.2F 25V 0805 4.7F 6.3V 0603 10F 6.3V 0603
80
Output Ripple (mV)
Output Voltage (V)
60
40
20
0 0 5 10 15 20 25 30
Load Current (mA)
Load Current (mA)
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AS1302
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Flying Capacitor Selection
To ensure the required output current and avoid high peak currents the values of the flying capacitors CFLY1 and CFLY2 are very critical. A 220nF capacitor is sufficient for most applications. Dependent on the operation mode the AS1302 alternately charges and discharges the CFLY1/2 . While the ESR of the output capacitor produces a part of the output voltage ripple, the ESR of the flying capacitors directly adds to the charge pump's output source resistance. Therefore low ESR capacitors, e.g. tantalum or ceramic, are recommended for the flying capacitors as well. Due to different materials for ceramic capacitors the on the material depending temperature and voltage coefficients have to be considered. The capacitance of a X7R ceramic capacitor is more stable than a Z5U or Y5V ceramic capacitor over the whole temperature range from -40C to +85C. As an additional effect a Z5U or Y5V ceramic capacitor will loose about the half of his nominal capacitance when the rated voltage is applied. It is important to choose the ceramic capacitor according to the minimum available capacitance over the operating voltage and the bias voltage. This information is stated in the datasheets of the capacitor manufacturer.
Table 5. Recommended Flying Capacitors Part Number C TC Code Rated Voltage Dimensions Manufacturer Murata www.murata.com
GRM188R71E224KA88 GRM155R61A224KE19
220nF 220nF
X7R X5R
25V 10V
0603 0402
Layout Consideration
To achieve the best performance of the AS1302 a careful board layout is necessary to reduce the impact of the high switching frequency and the high transient currents which are produced by the device. For a proper regulation under all conditions a true ground plane and short connections to all external capacitors are needed.
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AS1302
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
The device is available in a TDFN (3x3x0.8mm) 10-pin and WL-CSP 8-bumps package.
Figure 37. TDFN (3x3x0.8mm) 10-pin Package Diagram
D D2 SEE DETAIL B B A L E2/2
2x aaa C PIN 1 INDEX AREA (D/2 xE/2)
D2/2
E2 K N N-1 e (ND-1) X e b ddd bbb C CAB
BTM VIEW
PIN 1 INDEX AREA (D/2 xE/2)
aaa C
2x TOP VIEW
e DETAIL B
Terminal Tip
ccc C
E
A3
C
SEATING PLANE
0.08 C
A
Datum A or B ODD TERMINAL SIDE
Table 6. TDFN (3x3x0.8mm) 10-pin Package Dimensions Symbol Min Typ Max A 0.70 0.75 0.80 A1 0.00 0.02 0.05 A3 0.20 REF L1 0.03 0.15 L2 0.13 aaa 0.15 bbb 0.10 ccc 0.10 ddd 0.05 eee 0.08 ggg 0.10 Note:
Symbol D BSC E BSC D2 E2 L
Min
Typ 3.00 3.00
A1
SIDE VIEW
Max
k b e N ND
2.20 1.40 0.30 0 0.20 0.18
0.40
2.70 1.75 0.50
0.25 0.50 10 5
0.30
1. 2. 3. 4.
Figure 37 is shown for illustration only. N is the total number of terminals. All dimensions are in millimeters, angle is in degrees. Dimensioning and tolerancing conform to ASME Y14.5M-1994.
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AS1302
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
Figure 38. WL-CSP 8-bumps Package Diagram
Top through view
Bottom view Ball side
40 typ.
200 typ.
400
121020.00
20520
20
121020.00
20520
350 typ. 60030
Notes: ccc Coplanarity All dimensions in m
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CCC
20m
270 10
AS1302
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The device is available as the standard products shown in Table 7.
Table 7. Ordering Information Ordering Code Marking Description 5V/30mA Adaptive Inductorless Boost Converter 5V/30mA Adaptive Inductorless Boost Converter Delivery Form Package
AS1302-BWLT AS1302-BTDT
ASQ7 ASQ7
Tape and Reel Tape and Reel
WL-CSP 8-bumps TDFN (3x3x0.8mm) 10-pin
Note: All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
For further information and requests, please contact us mailto:sales@austriamicrosystems.com or find your local distributor at http://www.austriamicrosystems.com/distributor
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AS1302
Datasheet
Copyrights
Copyright (c) 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters austriamicrosystems AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact
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