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Impala Linear Corporation
ILC6377
0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown General Description The ILC6377 is a 95% efficient, 300kHz step-down DC-DC converter in an SO-8 package; capable of delivering 500mA output current. The device is also capable of driving an external FET for higher output current applications. The ILC6377 uses a unique p-channel architecture with built-in charge pump to maintain low on-resistance, even at low input voltages. At high or normal currents the ILC6377 operates in PWM mode with 300kHz operating frequency. When the load current drops and the device hits approximately 17% duty cycle, it automatically switches over to PFM or pulse skipping mode. PFM (pulse frequency modulation) mode of operation extends efficiency at light loads. Start-up is controlled via an external soft-start capacitor. The device will automatically re-enter start-up mode when an output current overload condition is sensed; thus providing automatic short-circuit protection. Voltage lockout prevents faulty operation below the minimum operating voltage level. In shutdown, the ILC6377 consumes only 1.5mA current. The ILC6377SO-XX offers fixed 3.3V or 5V ouput while ILC6377SO-Adj allows adjustable output. Both versions of ILC6377 are available in an SO-8 surface mount package. Features ! ! ! ! ! ! ! ! ! ! 2.5% accurate output voltages Guaranteed 500mA output current 95% efficiency 55mA no load battery input current 1.5mA shutdown current Built in short circuit and overcurrent protection Undervoltage lockout and soft-start External transistor drive available for higher Iout 300kHz operation Automatic switchover to PFM mode at low currents for longest battery life ! Fixed 3.3V or 5V or adjustable output ! SO-8 package Applications ! ! ! ! Cellular Phones Palmtops and PDAs Portable Instrumentation Buck Converter for Industrial / Networking Applications
Block Diagram
VI N VO UT
1 5
8 LX
Ordering Information
ILC6377SO-33 ILC6377SO-50 ILC6377SO-Adj 3.3V, 300 kHz step-down PWM/PFM converter 5V, 300 kHz step-down PWM/PFM converter Adjustable, 300 kHz step-down PWM/PFM converter
+ Error Amp S/ D, 4 So ftstar t, Vref S /D, V ref with S oftstart P rotection
7 EXT1
+ PWM Comp GATE DRIV ER
2 EXT2 3 P_BST
Pin Description
Pin Symbol
VIN EXT2 P-BST S/D Softstart, Vref VOUT/FB
P WM /PFM CONTROLLER
RAMP WAVE GENERATOR, OSCILLATOR
Function
Power Supply External gate drive pin (low when P-Ch FET is ON) P-Ch gate boost Shutdown, also soft-start capacitor pin and Vref output Output voltage sense pin for ILC6377SO-XX; 1V feedback for ILC6377SO adj Ground connection External gate drive pin (low when P-Ch FET is on) Inductor switch pin
6 GND
1 2 3 4
Pin Package Configurations
VI N EXT2 P_BST
1 2 3 8
LX EXT1 GND VO UT
VI N EXT2 P_BST
1 2 3
8
LX EXT1 GND FB
5
ILC6377
(TOP VIE W)
7 6 5
ILC6377
(TOP VIE W)
7 6 5
S/D, 4 CSS
S/D, 4 CSS
6 7 8
GND EXT1 LX
ILC6377SO-XX SO-8 Package
ILC6377SO-Adj SO-8 Package
Impala Linear Corporation
ILC6377 1.3
(408) 574-3939
www.impalalinear.com
June 1999
1
0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown Absolute Maximum Ratings (TA=25C)
Parameter VIN Input Voltage Pin VOUT Pin (ILC6370SO-XX) FB Pin (ILC6377SO-Adj) Voltage on LX pin Peak Switch Current on LX pin Voltage on P_BST pin Current EXT1, EXT2 pins Voltage on all other pins Continuous Total Power Dissipation Operating Ambient Temperature Storage Temperature Symbol VIN VOUT VFB VLX ILX VDP_BST IEXT1, IEXT2 ~ PD TOPR TSTG Ratings -0.3 to +12 -0.3 to +12 -0.3 to VIN +12 VIN - VLX = 0.3 to +12 700 VIN - VP_BST = 0.3 to +12 50 -0.3 to VIN 500 -30~+80 -40~+125 Units V V V mA V mA V mA C C
Electrical Characteristics ILC6377SO-33
Unless Otherwise specified all limits are at VOUT = 3.3V, VIN = 4V, FOSC=300kHz, IOUT = 130mA,TA = 25C. Circuit configuration of figure 1.
Parameter Output Voltage Input Voltage Output Voltage Input Current Supply Shutdown Current LX Switch On - Resistance LX Switch Leakage Current Oscillator Frequency Max Duty Cycle PFM Duty Cycle Efficiency Undervoltage Lockout Soft-Start Time
Symbol VOUT VIN IOUT IIN IS/D Rds(on) ILXL FOSC MAXDTY PFMDTY EFFI VUVLO TSS No Load
Conditions
Min 3.218
Typ
Max
Units V V mA
3.300 3.383 10
500 VIN 3.5V, No Loads VS/D = 0V Open Loop Measurement, VS/D = VIN, VLX = VIN - 0.4V, VOUT = 3V Open Loop Measurement, VOUT = VIN, VLX = 0V Measurement Waveform at EXT pin VIN = 3.6V IOUT = 20mA 255
600 55 1.5 0.64 86 2.5 0.85 2.0 300 100 345
A A A kHz %
10
17 95
25
% %
Minimum VIN when Vref does not start up Vref rises to 0V from 0.9V
1 6.0 10.0
1.8 16.0
V msec
Impala Linear Corporation
ILC6377 1.3
(408) 574-3939
www.impalalinear.com
June 1999
2
0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown Electrical Characteristics ILC6377SO-33
Unless Otherwise specified all limits are at VOUT = 3.3V, VIN = 4V, FOSC=300kHz, IOUT = 130mA,TA = 25C. Circuit configuration of figure 1.
Parameter Internal Protection Time Shutdown Input Voltage EXT1, EXT2 Hi On-Resistance EXT1, EXT2 Low On-Resistance
Symbol TPRO VSD REXtHI
Conditions Time from VOUT = 0V to VS/D going low High = Regulator "ON" Low = Regulator "OFF" 3V applied to VOUT with no external components
Min 3.0 0.65
Typ 5.0
Max Units 8.0 0.2 Msec V
3.5 29
47 37
REXtLOW 3.6V applied to VOUT with no external components
Electrical Characteristics ILC6377SO-50
Unless Otherwise specified all limits are at VOUT = 5.0V, VIN = 6V, FOSC=300kHz, IOUT = 200mA, TA = 25C. Circuit configuration of figure 1.
Parameter Output Voltage Input Voltage Output Current Input Supply Current Shutdown Current LX Switch On-Resistance LX Switch Leakage Current Oscillator Frequency Max Duty Cycle PFM Duty Cycle Efficiency Undervoltage Lockout Soft-Start Time Internal Protection Time Shutdown Input Voltage EXT1, EXT2 Hi On-Resistance
Symbol VOUT VIN IOUT IIN IS/D Rds(on) ILXL FOSC MAXDTY PFMDTY EFFI VUVLO TSS TPRO VS/D REXtHI
Conditions
Typ Max Units V 4.875 5.000 5.125 10 500 600 71 1.5 0.44 110 2.5 0.58 2.0 255 300 100 345 25 1.8 16.0 8.0 0.2 V mA A A A kHz % % % V msec msec V 24 20 32 26
Min
VIN 5.25V, No Load VS/D = 0V Open Loop Measurement, VS/D = VIN, VLX =VIN - 0.4V, VOUT = 4.5V Open Loop Measurement, VOUT = VIN, VLX = 0V Measure Waveform at EXT pin VIN = 5.3V IOUT = 20mA No Load Minimum VIN when Vref does not start up Vref rises to 0V from 0.9V Time form VOUT m = 0V to VS/D going low High = Regulator "ON" Low = Regulator "OFF" Open Loop Measurement Open Loop Measurement
10 1 6.0 3.0 0.65
17 95 10.0 5.0
EXT1, EXT2 Low On-Resistance REXtLOW
Impala Linear Corporation
ILC6377 1.3
(408) 574-3939
www.impalalinear.com
June 1999
3
0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown
Electrical Characteristics ILC6377SO-Adj
Unless Otherwise specified all limits are at VOUT programmed to 5.0V, VIN = 6V, FOSC=300kHz, IOUT = 200mA, TA = 25C. Circuit configuration of figure 1.
Parameter Feedback Voltage (pin5) Input Voltage Output Current Input Supply Current Shutdown Current LX Switch On-Resistance
Symbol VFB VOUT IOUT IIN IS/D Rds(on)
Conditions
Min .995
Typ 1.000
Max 1.015 8
Units V V mA
RFB1 + RFB2 < 2M
3 500 600 71 1.5 0.44
VIN 5.25V, No Load VS/D = 0V Open Loop Measurement, VS/D = VIN, VLX = VIN - 0.4V, VOUT = 4.5V Open Loop Measurement, VOUT = VIN, VLX = 0V Measure Waveform at EXT pin VIN = 5.3V IOUT = 20mA 255
110 2.5 0.58
A A
LX Switch On-Resistance
ILXL
2.0
A
Oscillator Frequency
FOSC
300
345
kHz
Max Duty Cycle PFM Duty Cycle Efficiency Undervoltage Lockout Soft-Start Time Internal Protection Time Shutdown Input Voltage EXT1, EXT2 Hi On-Resistance EXT1, EXT2 Low On-Resistance
MAXDTY PFMDTY EFFI VUVLO TSS TPRO VS/D REXtHI REXtLOW Minimum VIN when Vref does not start up Vref rises to 0V from 0.9V Time from VOUT m = 0V to VS/D going low High = Regulator "ON" Low = Regulator "OFF" Open Loop Measurement Open Loop Measurement 1 6.0 3.0 0.65 No Load 10
100 17 95 1.8 10.0 5.0 16.0 8.0 0.2 24 20 32 26 25
% % % V msec msec V
Impala Linear Corporation
ILC6377 1.3
(408) 574-3939
www.impalalinear.com
June 1999
4
0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown
SD1
VI N S/D
1
*CI N
+ 2 3 4
8
10F
ILC6377
(TOP VIE W)
7 6 5 +
L 22H
VO UT
CL 47F
CSS
Fig. 1: 1. Typical step-down DC-DC Fig Typical step-down wn DC-DC converter application converter application
SD1 : MA735 Schottky Diode ( MATSUSHITA ) CL : 10V/47F Tantalum Capacitor ( NICHICON, F93 ) CSS : 4700pF Ceramic Capacitor CIN : 16V / 10F Tantalum Capacitor ( NICHICON, F93 )
Figure 2 shows a typical fixed output voltage step-down DC-DC converter application circuit for ILC6377SO-XX
External component selection Proper selection of external components is important for achieving high performance. The output inductor selected should have low DC resistance on the order of 0.2W or less and saturation current rating of 1A or higher. Recommended inductors are Sumida CD54 (22mH, 0.18W max DC resistance) or Coilcraft DO3308P-223 (22mH, 0.18W max DC resistance) or equivalent. The catch diode should be a schottky diode with low forward drop and rated at 1A or greater current, MA735 or it's equivalent is recommended. Input and output capacitors should be tantalum capacitors with low equivalent series resistance (ESR) and voltage rating higher than the actual application. Soft-start Pin 4 of ILC6377 functions as the soft-start pin as well as the shutdown pin. A soft-start capacitor (from pin 4 to ground) controls the rate at which the power supply starts up; thus preventing large overshoots at the output as well as large inrush current. The value for CSS should be 100pF or greater. Shutdown The ILC6377 is placed in shutdown mode by taking pin 4 to ground. In shutdown, the quiescent current of the device is under 2mA. When using the shutdown feature, pin 4 must be driven from an open collector or open drain output without employing an external pull-up resistor, as shown in figure 2. Since pin 4 is also used to charge an external capacitor for soft-start, this pin should not be driven from a pushpull CMOS type output.
Over-current and short-circuit protection In the event of an over-current or short-circuit condition, the ILC6377 cycles the soft-start pin in a hiccup mode to provide fault protection. When the output voltage decreases due to overload, the ILC6377 will operate continuously at the maximum duty cycle. If the period of maximum duty cycle operation exceeds TPRO (typically 5 msec), pin 4 will be pulled low; thus discharging the external soft-start capacitor CSS. This action inhibits the regulator's PWM action. Next, the ILC6377's soft-start circuitry starts recharging CSS and initiates a controlled start-up. If the overload condition continues to exist, the above sequence of events will repeat; thus continuing to cycle the soft-start function. Note that very little power is dissipated with this method of fault protection versus constant current limit protection. Even though the internal power MOSFET is pulsed on and off at high peak current, the DC current is low; thus leading to low power dissipation even under short-circuit conditions. Keep in mind that the duration of maximum duty cycle condition is used to trigger the ILC6377's fault protection circuit. As such, a small input-output (VIN - VOUT) differential voltage may trigger the device's fault protection circuitry even at low output current. Undervoltage Lockout The undervoltage lockout feature prevents faulty operation by disabling the operation of the regulator when input voltage is below the minimum operating voltage, VUVLO. When the input voltage is lower than VUVLO the device disables the internal P-channel MOSFET and provides "high" output at both EXT1 and EXT2 outputs.
Impala Linear Corporation
ILC6377 1.3
(408) 574-3939
www.impalalinear.com
June 1999
5
0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown
To pin 8 EXT1
VI N S/D
*CI N
SD1
1 + 2 3 4 8
V OU T
L
6 5
ILC6377
(TOP VIE W)
7 6 5 +
CF B
R FB1 R FB2
VO UT
CL
RFB 1 + RF B2 2M 1 CF B chosen so that 1kHz < ----------------------------------------------------- < 20kHz 2 x x CF B x RFB1
CSS
Fig. 2: 1Amp output current application usingapplication Fig.2 1Amp output current external MOSFET
using external MOSFET The EXT1 and EXT2 pins are provided so as to drive external transistors; thus allowing design flexibility. The EXT output drive signal has the same timing as the gate drive to the internal P-channel MOSFET i.e. EXT output is low as long as the internal MOSFET is on. Both EXT1 and EXT2 pins are capable of driving 1000pF gate capacitance. For example, a high output current application circuit using an external Pchannel MOSFET is shown in figure 2.
Fig. 4: Adjustable output using ILC6377SO-Adj Fig.4 Adjustable output using ILC6377SO-Adj (Note: rest ( Note : rest of circuit is same as figureFig.1 ) of circuit is same as 1) Adjustable Output ( ILC6377SO-Adj ) For adjustable output voltage ILC6377SO-Adj should be used. All connections to the ILC6377SO-Adj are the same as ILC6377SO-XX, except for the feedback voltage divider network shown in figure 4. The output voltage, VOUT, can be calculated from the following equation:
VOUT = VFB ( 1 + RFB1/RFB2 ), where VFB is approximately 1V and RFB1 + RFB2 < 2M The feedback compensation capacitor should be chosen such that the pole frequency f is between 1kHz and 20kHz:
1
8
C BST 2200pF SD1 MA729 Schottky
2 3 4
ILC6377
(TOP VI EW)
7 6 5
1kHz<
Voltage between VIN and P_BST between Vin and must be less than 10V.
1 2 x X CFB X RFB1
<20kHz
Fig. 3. P-Channel Negative Figure 3: P-Channel Negative
P-Channel Boost Circuit The ILC6377 includes a unique P-Channel MOSFET architecture with built-in charge pump to maintain low on-resistance even at low input voltages. As shown in figure 3, a 2200pF ceramic capacitor and a schottky diode ( MA729 or equivalent ) allows the gate voltage of the internal P-Channel MOSFET to be driven negative; thus reducing the switch on-resistance. This technique can be employed to increase efficiency at low input voltages and high output currents. Note that the voltage between VIN and P_BST should not exceed 10V, otherwise damage to the device may occur. For high input voltage applications the schottky diode should be replaced by a low voltage zener diode so that the P_BST pin is clamped to a safe negative voltage.
The pole frequency should generally be set at 5kHz. The value of CFB calculated from the above equation may require some adjustment depending on the output inductor ( L ) and output capacitor ( CL ) values chosen. Example for 3V output : RFB1 = 400k RFB2 = 200k CFB = 100pF PC Board Layout As with all switching DC-DC converter designs, good PC board layout is critical for optimum performance. The heavy lines indicated in figure 1 schematic should be wide printed circuit board traces and should be kept as short as is practical. A large ground plane with as much copper area as is allowable should be used. All external components should be mounted as close to the IC as possible. For ILC6377SO-Adj, the feedback resistors and their associated wiring should be kept away from the inductor location and the vicinity of inductive flux.
Impala Linear Corporation
ILC6377 1.3
(408) 574-3939
www.impalalinear.com
June 1999
6
0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown Typical Performance Characteristics
General conditions for all curves: Circuit of figure 1; L = 20H (Sumida, CD54), CIN = 47F (tantalum) with 0.1F (ceramic), CL = 47H (tantalum) MA735 (Matsushita) schottky diode, CSS = 4700pF (ceramic), TA = 25C unless otherwise noted.
Output Voltage vs. Output Current
ILC6377SO-33
3.5 L = 22H (CD54)
OUTPUT VOLTAGE: VOUT (V)
5.0V
3.4
VIN = 3.96
3.3
3.2
8.0V
3.1
3.0 0.1 1 10 100 1000
OUTPUT CURRENT: IOUT (mA)
ILC6377SO-33
3.5
L = 10H (CD54) 3.5
ILC6377SO-33
L = 47H (CD105)
OUTPUT VOLTAGE: VOUT (V)
5.0V
3.4
VIN = 3.96
OUTPUT VOLTAGE: VOUT (V)
5.0V
3.4
VIN = 4.0V
3.3
3.3
3.2
8.0V
3.2
8.0V
3.1
3.1
3.0 0.1 1 10 100 1000
3.0 0.1 1 10 100 1000
OUTPUT CURRENT: IOUT (mA)
OUTPUT CURRENT: IOUT (mA)
ILC6377SO-50
5.4
L = 22H (CD54)
OUTPUT VOLTAGE: VOUT (V)
10.0V 8.0V
5.2
5.0
VIN = 6.0V
4.8
4.6
4.4 0.1 1 10 100 1000
OUTPUT CURRENT: IOUT (mA)
Impala Linear Corporation
ILC6377 1.3
(408) 574-3939
www.impalalinear.com
June 1999
7
0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown Typical Performance Characteristics
General conditions for all curves: Circuit of figure 1; L = 20H (Sumida, CD54), CIN = 47F (tantalum) with 0.1F (ceramic), CL = 47H (tantalum) MA735 (Matsushita) schottky diode, CSS = 4700pF (ceramic), TA = 25C unless otherwise noted.
ILC6377SO-33
100
VIN = 3.96
L = 22H (CD54)
80
EFFICIENCY: EFFI(%)
60
6.0V
5.0V
40
20
0 0.1 1 10 100 1000
OUTPUT CURRENT: IOUT (mA)
ILC6377SO-33
100
L = 10H (CD54) 100
ILC6377SO-33
L = 47H (CD105)
EFFICIENCY: EFFI(%)
80
80
60
5.0V 6.0V
VIN = 3.96
EFFICIENCY: EFFI(%)
60
5.0V
8.0V
40
40
VIN = 4.0
20
20
0 0.1 1 10 100 1000
0 0.1 1 10 100 1000
OUTPUT CURRENT: IOUT (mA)
OUTPUT CURRENT: IOUT (mA)
ILC6377SO-50
100
L = 22H (CD54)
EFFICIENCY: EFFI(%)
80
8.0V
60
VIN = 6.0V
10.0V
40
20
0 0.1 1 10 100 1000
OUTPUT CURRENT: IOUT (mA)
Impala Linear Corporation
ILC6377 1.3
(408) 574-3939
www.impalalinear.com
June 1999
8
0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown Typical Performance Characteristics
General conditions for all curves: Circuit of figure 1; L = 20H (Sumida, CD54), CIN = 47F (tantalum) with 0.1F (ceramic), CL = 47H (tantalum) MA735 (Matsushita) schottky diode, CSS = 4700pF (ceramic), TA = 25C unless otherwise noted. OUTPUT vs. AMBIENT TEMPERATURE ILC6377SO-33
OUTPUT VOLTAGE: VOUT1, VOUT2(V)
3.40 3.40
SUPPLY CURRENT vs. AMBIENT TEMPERATURE ILC6377SO-33
3.35 VOUT1 3.30 VOUT2 3.25 VOUT1
SUPPLY CURRENT: IDD(A)
40 60 80
3.35
3.30
3.25
3.20 -40 -20 0 20
3.20 -40 -20 0 20 40 60 80
AMBIENT TEMP.: Ta(C)
AMBIENT TEMP.: Ta(C)
STAND-BY CURRENT vs. AMBIENT TEMPERATURE ILC6377SO-33
LX SWITCH RESISTANCE: RSWON()
3.40
LX ON RESISTANCE vs. AMBIENT TEMPERATURE ILC6377SO-33
3.40
OUTPUT VOLATAGE: VOUT(V)
3.35
3.35
3.30
3.30
3.25
3.25
3.20 -40 -20 0 20 40 60 80
3.20 -40 -20 0 20 40 60 80
AMBIENT TEMP.: Ta(C)
AMBIENT TEMP.: Ta(C)
OSCILLATION FREQUENCY vs. AMBIENT TEMPERATURE ILC6377SO-33
3.40
PFM DUTY RATIO vs. AMBIENT TEMPERATURE ILC6377SO-33
3.40
OSCILLATION FREQUENCY: FOSC(kHz)
3.35
PFM DUTY RATIO: PFMDTY(%)
-40 -20 0 20 40 60 80
3.35
3.30
3.30
3.25
3.25
3.20
3.20 -40 -20 0 20 40 60 80
AMBIENT TEMP.: Ta(C)
AMBIENT TEMP.: Ta(C)
Impala Linear Corporation
ILC6377 1.3
(408) 574-3939
www.impalalinear.com
June 1999
9
0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown Typical Performance Characteristics
General conditions for all curves: Circuit of figure 1; L = 20H (Sumida, CD54), CIN = 47F (tantalum) with 0.1F (ceramic), CL = 47H (tantalum) MA735 (Matsushita) schottky diode, CSS = 4700pF (ceramic), TA = 25C unless otherwise noted. EFFICIENCY vs. AMBIENT TEMPERATURE ILC6377SO-33
MIN. OPERATING VOLTAGE: VOUT(V)
100 1.8
MINIMUM OPERATING VOLTAGE vs. AMBIENT TEMPERATURE ILC6377SO-33
EFFICIENCY: EFFI(%)
90
1.6
80
1.4
70
1.2
60 50 -40 -20 0 20 40 60 80
1.0
0.8 -40 -20 0 20 40 60 80
AMBIENT TEMP.: Ta(C)
AMBIENT TEMP.: Ta(C)
SOFT-START TIME vs. AMBIENT TEMPERATURE ILC6377SO-33
16
CE "L" VOLTAGE vs. AMBIENT TEMPERATURE ILC6377SO-33
1.0
SOFT-START TIME: TSS(V)
CE "L" VOLTAGE: VCEL(V)
-40 -20 0 20 40 60 80
12
0.8
0.6
8
0.4
4
0.2
0
0.0 -40 -20 0 20 40 60 80
AMBIENT TEMP.: Ta(C)
AMBIENT TEMP.: Ta(C)
CE "H" VOLTAGE vs. AMBIENT TEMPERATURE ILC6377SO-33
1.0
CE "H" VOLTAGE: VCEH(V)
0.8
0.6
0.4
0.2
0.0 -40 -20 0 20 40 60 80
AMBIENT TEMP.: Ta(C)
Impala Linear Corporation
ILC6377 1.3
(408) 574-3939
www.impalalinear.com
June 1999
10
0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown Typical Performance Characteristics
General conditions for all curves: Circuit of figure 1; L = 20H (Sumida, CD54), CIN = 47F (tantalum) with 0.1F (ceramic), CL = 47H (tantalum) MA735 (Matsushita) schottky diode, CSS = 4700pF (ceramic), TA = 25C unless otherwise noted. ILC6377SO-33
3.4
ILC6377SO-33
VIN = 4V, IOUT = 100A - 100mA 500 Output Voltage 3.4
VIN = 4V, IOUT = 100mA - 100A 500
OUTPUTCURRENT IOUT(mA)
3.3
400
OUTPUT VOLTAGE VOUT(V)
3.3 Output Voltage 3.2
400
3.2
300
300
3.1 Output Current 3.0 100mA 100A
200
3.1 Output Current 3.0 100mA 100A
200
100
100
2.9
0
2.9
0
TIME (0.5msec/div)
TIME (0.5msec/div)
ILC6377SO-33
VIN = 4V, IOUT = 100A - 100mA 3.4 500 3.4
ILC6377SO-33
VIN = 4V, IOUT = 300mA - 100A 500
OUTPUTCURRENT IOUT(mA)
OUTPUT VOLTAGE VOUT(V)
OUTPUT VOLTAGE VOUT(V)
3.3
400
3.3 Output Voltage 3.2 Output Current 300mA 3.0 100A
400
3.2 Output Current 300mA 3.0 100A 2.9
300
300
3.1
200
3.1
200
100
100
0
2.9
0
TIME (0.5msec/div)
TIME (0.5msec/div)
ILC6377SO-33
VIN = 4V, IOUT = 10mA - 300mA 3.4 Output Voltage 500
ILC6377SO-33
VIN = 4V, IOUT = 300mA - 10mA 500
OUTPUTCURRENT IOUT(mA)
3.3
400
400 Output Voltage 300
3.2
300
3.1 300mA 3.0 100A 2.9
Output Current
200
Output Current 300mA
200
100
100 100A
0
0
TIME (0.5msec/div)
TIME (0.5msec/div)
Impala Linear Corporation
ILC6377 1.3
OUTPUTCURRENT IOUT(mA)
OUTPUT VOLTAGE VOUT(V)
OUTPUT VOLTAGE VOUT(V)
OUTPUTCURRENT IOUT(mA)
Output Voltage
OUTPUTCURRENT IOUT(mA)
OUTPUT VOLTAGE VOUT(V)
(408) 574-3939
www.impalalinear.com
June 1999
11

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