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ACE707A
Technology Description
Micro Power Step-up DC-DC Converter
The ACE707A are Pulse Frequency Modulation (PFM) DC/DC converters. These two devices are functionally equivalent except the switching current limit. The ACE707A is for lower power systems with 100mA current limit. The ACE707A feature a wide input voltage. The operation voltage is ranged from 1V to 12V. A current limited, fixed off-time control scheme conserves operating current, resulting in high efficiency over a broad range of load current. They also feature low quiescent current, switching current limiting, low temperature coefficient, etc. Fewer tiny external components are required in the applications to save space and lower cost. Furthermore, to ease its use in different systems, a disable terminal is designed to turn on or turn off the chip. The ACE707A are available in SOT-23-5 package.
Features
* * * * * * * * * * * *
Low Quiescent Current In Active Mode (Not Switching): 17A Typical ,In Shutdown Mode: < 1A Low Operating VIN 1.0V Typical for ACE707A Low VCESAT Switch 70mV Typical at 70mA for ACE707A High Output Voltage: up to 34V Fixed Off-Time Control Switching Current Limiting 100mA Typical for ACE707A Operating Temperature Range: -40 to 85
Application
MP3, MP4 Battery Power Supply System LCD/OLED Bias Supply Handheld Device Portable Communication Device
VER 1.2
1

ACE707A
Technology Absolute Maximum Ratings
Parameter Input voltage SW Voltage FB Voltage
Micro Power Step-up DC-DC Converter
Symbol VIN VSW VFB
Max 15 36 VIN 15 265 150
Unit V V V V /W
SHDN Pin Voltage VSHDN Thermal Resistance (Junction to Ambient, no Heat sink) RJA Operating Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10sec) ESD (Human Body Model) TJ TSG TLEAD
-65 TO 150 260 3000 V
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" 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 under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability.
Packaging Type
SOT-23-5
5 4
1
2
3
Pin SW GND FB
SOT-23-5 1 2 3
Function Switch Pin. This is the collector of the internal NPN power switch. Minimize the trace area connected to this Pin to minimize EMI Ground Pin. GND should be tied directly to ground plane for best performance Feedback Pin. Set the output voltage through this pin. The formula is VOUT=1.23V*(1+R1/R2). Keep the loop between Vout and FB as short as possible to minimize the ripple and noise, which is beneficial to the stability and output ripple Shutdown Control Pin. Tie this pin above 0.9V to enable the device. Tie below 0.25V to turn off the device Supply Input Pin. Bypass this pin with a capacitor as close to the device as possible
SHDN VIN
4 5
VER 1.2
2

ACE707A
Technology Ordering Information
Selection Guide ACE707A XX + H Halogen - free Pb - free BN : SOT-23-5
Micro Power Step-up DC-DC Converter
Functional Block Diagram
Recommended Work Conditions
Item Input voltage Operating Temperature Symbol VIN TA Min 1.0 -40 Max 12ut 85 Unit V
VER 1.2
3

ACE707A
Technology Electrical Characteristics
VIN=VSHDN=1.2V, TA=25, unless otherwise specified.
Micro Power Step-up DC-DC Converter
Parameter Input Voltage Quiescent Current Feedback Voltage FB Comparator Hysteresis FB Pin Bias Current Output Voltage Line Regulation Switching Current Limit Switch Saturation Voltage Switch Off Time SHDN Input Threshold High SHDN Input Threshold Low SHDN Pin Current Switch Leakage Current
Symbol VIN IQ VFB VFBH IFB LNR IL VCESAT TOFF VTH VTL ISHDN ISWL
Test Conditions Not Switching VSHDN=0V
Min 1.0
Typ 17
1.205 VFB=1.23V 1.2V1V VFB<0.6V 0.9
1.23 8 30 0.05 100 70 400 1.5
Max 12 30 1 1.255 80 0.1 125 120
Unit V A V mV nA %/V mA mV nS S V
0.25 VSHDN=1.2V VSHDN=5V Switch Off, VSW=5V 2 8 0.01 3 12 5 A A
VER 1.2
4

ACE707A
Technology Typical Performance Characteristics
Unless otherwise note, VIN=1.2V
Micro Power Step-up DC-DC Converter
Junction Temperature ()
Junction Temperature ()
Figure 1. Quiescent Current vs. Junction Temperature
Figure 2. Feedback Voltage vs. Junction Temperature
Junction Temperature ()
Shutdown Pin Voltage (V)
Figure 3. Switch Off Time vs. Junction Temperature
Figure 4. Shutdown Pin Current vs. Shutdown Pin Voltage
ACE707A
ACE707A
Junction Temperature ()
Junction Temperature ()
Figure 5. Switch Current Limit vs. Junction Temperature
Figure 6. Switch Current Limit vs. Junction Temperature
VER 1.2
5

ACE707A
Technology
Micro Power Step-up DC-DC Converter
ACE707A, ISMITCH=300mA
ACE707A, ISMITCH=70mA
Junction Temperature ()
Junction Temperature ()
Figure 7. Saturation Voltage vs. Junction Temperature
Figure 8. Saturation Voltage vs. Junction Temperature
Load Current (mA)
Load Current (mA)
Figure 9. Efficiency
Figure 10. Efficiency
Application Information
Operating Principles ACE707A feature a constant off-time control scheme. Refer to Figure 3 the bandgap voltage VREF (1.23V typical) is used to control the output voltage. When the voltage at the FB pin drops below the lower hysteresis point of Feedback Comparator (typical hysteresis is 8mV), the Feedback Comparator enables the chip and the NPN power switch is turned on, the current in the inductor begins to ramp up and store energy in the coil while the load current is supplied by the output capacitor. Once the current in the inductor reaches the current limit, the Current-Limit Comparator resets the 400ns One-Shot which turns off the NPN switch for 400ns. The SW voltage rises to the output voltage plus a diode drop and the inductor current begins to ramp down. During this time the energy stored in the inductor is transferred to COUT and the load. After the 400ns off-time, the NPN switch is turned on and energy will be stored in the inductor again. This cycle will continue until the voltage at FB pin reaches 1.23V, the Feedback Comparator disables the chip and turns off the NPN switch. The load current is then supplied solely by output capacitor and the output voltage will decrease. When the FB pin voltage drops below the lower hysteresis point of Feedback Comparator, the Feedback Comparator enables the device and repeats the cycle described previously. Under not switching condition, the IQ of the device is about 17A.
VER 1.2 6

ACE707A
Technology
Micro Power Step-up DC-DC Converter
The ACE707A contain additional circuitry to provide protection during start-up or under short-circuit conditions. When the FB pin voltage is lower than approximately 0.6V, the switch off-time is increased to 1.5s and the current limit is reduced to about 250mA (70mA for ACE707A). This reduces the average inductor current and helps to minimize the power dissipation in the ACE707A power switch, in the external inductor and in the diode. The SHDN pin can be used to turn off the ACE707A and reduce the IQ to less than 1A. In shutdown mode the output voltage will be a diode drop below the input voltage.
Typical Application
Vin 2.5V to 4.2V L1 10uH D1 SS14 Vout 20V
R1 2M C1 4.7 uF SW ACE707A SHEN FB GND R2 130K Vin C2 1uF RLOAD
C1, C2: X5R or X7R Ceramic Capacitor L1: SUMIDA CDRH4D16FB/NP-100MC or Equivalent Figure 11. ACE707A Typical Application in LCD/OLED Bias Supply
ACE707A
C1, C2, C3: X5R or X7R Ceramic Capacitor L1: SUMIDA CDRH4D16FB/NP-100MC or Equivalent Figure 12. ACE707A Typical Application in 1 or 2 Cells to 3.3V Boost Converter
VER 1.2 7

ACE707A
Technology Packing Information
SOT-23-5
Micro Power Step-up DC-DC Converter
VER 1.2
8

ACE707A
Technology
Micro Power Step-up DC-DC Converter
Notes ACE does not assume any responsibility for use as critical components in life support devices or systems without the express written approval of the president and general counsel of ACE Electronics Co., LTD. As sued herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and shoes failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
ACE Technology Co., LTD. http://www.ace-ele.com/
VER 1.2
9

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