ILC6377SO-ADJ - Impala Linear Corporation

Impala Linear Corporation 1

(408) 574-3939 www.impalalinear.com June 1999

ILC6377 1.3

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 approxi-

mately 17% duty cycle, it automatically switches over to

PFM or pulse skipping mode. PFM (pulse frequency mod-

ulation) 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.

!±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

!Cellular Phones

!Palmtops and PDAs

!Portable Instrumentation

!Buck Converter for Industrial / Networking Applications

PWM/PFM

Protection

LX

GND

EXT1

RA MP WAVE

VIN

VOUT

P_BST

GATE

DR IV ER

GENERATOR,

OSCILLATORCONTROLLER

+

-

PWM

Comp EXT2

+

-

Error

Amp

1

5

4

6

3

2

7

8

S/D,

Softstart,

Vref S/D,

Vref

with

Soft-

start

ILC6377

(TOP VIE W)

3

45

1

2

6

7

8LX

FB

EXT1

S/D, GND

P_BST

EXT2

VIN

ILC6377SO-Adj

CSS

SO-8 Package

ILC6377

(TOP VIE W)

3

LX

VOUT

EXT1

45S/D, GND

1

2

6

7

8

P_BST

EXT2

VIN

CSS

SO-8 Package

ILC6377SO-XX

Ordering Information

ILC6377SO-33 3.3V, 300 kHz step-down PWM/PFM converter

ILC6377SO-50 5V, 300 kHz step-down PWM/PFM converter

ILC6377SO-Adj Adjustable, 300 kHz step-down PWM/PFM conv erter

Symbol

Function

1

VIN

Power Supply

2

EXT2

External gate drive pin (low when

P-Ch FET is ON)

3

P-BST

P-Ch gate boost

4

S/D

Softstart, Vref

Shutdown, also soft-start capacitor

pin and Vref output

5

VOUT/FB

Output volt age sense pin for

ILC6377SO-XX; 1V feedback for

ILC6377SO adj

6

GND

Ground connect i on

7

EXT1

External gate drive pin (low when

P-Ch FET is on)

8

LX

Induct or swi tch pin

ILC6377

0.5A, 300kHz, SO-8 PWM/PFM Step Down

Converter with Shutdown

Impala Linear Cor por ation

General Description Features

Applications

Block Diagram

Pin Package Configurations

Pin Description

0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown

Impala Linear Corporation 2

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ILC6377 1.3

Conditions

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

No Load

Minimum VIN when Vref does not start up

Vref rises to 0V from 0.9V

Parameter

Output Voltage

Input Voltage

Output Voltage

Input Current Supply

Shutdown Current

LX Switch On - Resistance

LXSwitch 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

Unless Otherwise specified all limits are at VOUT = 3.3V, VIN = 4V, FOSC=300kHz, IOUT = 130mA,TA= 25°C. Circuit configuration of figure 1.

Parameter

VIN Input Voltage Pin

VOUT Pin (ILC6370SO-XX)

FB Pin (ILC6377SO-Adj)

Voltage on LXpin

Peak Switch Current on LXpin

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 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

mA

V

mA

V

mA

°C

Typ

3.300

600

55

1.5

0.64

300

100

17

95

10.0

Min

3.218

500

255

10

1

6.0

Max

3.383

10

86

2.5

0.85

2.0

345

25

1.8

16.0

Units

V

mA

µA

Ω

µA

kHz

%

V

msec

Absolute Maximum Ratings (TA=25°C)

Electrical Characteristics ILC6377SO-33

0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown

Impala Linear Corporation 3

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ILC6377 1.3

Min

4.875

500

255

10

1

6.0

3.0

0.65

Typ

5.000

600

71

1.5

0.44

300

100

17

95

10.0

5.0

24

20

Symbol

VOUT

VIN

IOUT

IIN

IS/D

Rds(on)

ILXL

FOSC

MAXDTY

PFMDTY

EFFI

VUVLO

TSS

TPRO

VS/D

REXtHI

REXtLOW

Parameter

Output Voltage

Input Voltage

Output Current

Input Supply Current

Shutdown Current

LXSwitch On-Resistance

LXSwitch 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

EXT1, EXT2 Low On-Resistance

Parameter

Internal Protection Time

Shutdown Input Voltage

EXT1, EXT2 Hi On-Resistance

EXT1, EXT2 Low On-Resistance

Symbol

TPRO

VSD

REXtHI

REXtLOW

Conditions

Time from VOUT = 0V to VS/D going low

High = Regulator “ON”

Low = Regulator “OFF”

3V applied to VOUT with no external components

3.6V applied to VOUT with no external components

Min

3.0

0.65

Typ

5.0

3.5

29

Max

8.0

0.2

47

37

Units

Msec

V

Ω

Conditions

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

Max

5.125

10

110

2.5

0.58

2.0

345

25

1.8

16.0

8.0

0.2

32

26

Units

V

mA

µA

Ω

µA

kHz

%

V

msec

V

Ω

Electrical Characteristics ILC6377SO-33

Electrical Characteristics ILC6377SO-50

Unless Otherwise specified all limits are at VOUT = 3.3V, VIN = 4V, FOSC=300kHz, IOUT = 130mA,TA= 25°C. Circuit configuration of figure 1.

Unless Otherwise specified all limits are at VOUT = 5.0V, VIN = 6V, FOSC=300kHz, IOUT = 200mA, TA= 25°C. Circuit configuration of figure 1.

0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown

Impala Linear Corporation 4

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ILC6377 1.3

Parameter Symbol Conditions Min Typ Max Units

Feedback Voltage (pin5) VFB .995 1.000 1.015 V

Input Voltage VOUT RFB1 + RFB2 < 2MΩ38V

Output Current IOUT 500 600 mA

Input Supply Current IIN VIN 5.25V, No Load 71 110 µA

Shutdown Current IS/D VS/D = 0V 1.5 2.5 µA

LX Switch On-Resistance Rds(on) Open Loop Measurement, VS/D = VIN, 0.44 0.58 Ω

VLX = VIN - 0.4V, VOUT = 4.5V

LX Switch On-Resistance ILXL Open Loop Measurement, VOUT = VIN, 2.0 µA

VLX = 0V

Shutdown Input Voltage VS/D High = Regulator “ON” 0.65 0.2 V

Low = Regulator “OFF”

Oscillator Frequency FOSC Measure Waveform at EXT pin VIN = 255 300 345 kHz

5.3V IOUT = 20mA

Max Duty Cycle MAXDTY 100 %

PFM Duty Cycle PFMDTY No Load 10 17 25 %

Efficiency EFFI 95 %

Undervoltage Lockout VUVLO Minimum VIN when Vref does not start up 1 1.8 V

Soft-Start Time TSS Vref rises to 0V from 0.9V 6.0 10.0 16.0 msec

Internal Protection Time TPRO T ime from VOUT m = 0V to VS/D going low 3.0 5.0 8.0 msec

EXT1, EXT2 Hi On-Resistance REXtHI Open Loop Measurement 24 32 Ω

EXT1, EXT2 Low On-Resistance REXtLOW Open Loop Measurement 20 26 Ω

Electrical Characteristics ILC6377SO-Adj

Unless Otherwise specified all limits are at VOUT programmed to 5.0V, VIN = 6V, FOSC=300kHz, IOUT = 200mA, TA= 25°C. Circuit configuration of figure 1.

0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown

Impala Linear Corporation 5

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ILC6377 1.3

+

VOUT

ILC6377

(TOP VIE W)

3

45

1

2

6

7

8

+CL

VIN

S/D

CSS

SD1

L

*CIN

Fi g 1. Typi cal ste p-down DC-DC

con verter application

SD1 : MA735 Schot tk y Diode ( M AT SUSH ITA )

CL : 1 0 V /4 7 µF Tant alum Capac itor ( NI CH IC ON, F 93 )

CSS : 4700pF C eramic C apacit or

CIN : 16V / 10µF Tantalum Capac itor ( N IC HICON, F93 )

22µH

47µF

10µF

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 for-

ward 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 rat-

ing 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 in-

rush 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 with-

out employing an external pull-up resistor, as shown in fig-

ure 2. Since pin 4 is also used to charge an external capac-

itor for soft-start, this pin should not be driven from a push-

pull 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 max-

imum duty cycle. If the period of maximum duty cycle oper-

ation 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 initi-

ates a controlled start-up. If the overload condition continues

to exist, the above sequence of events will repeat; thus con-

tinuing 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 protec-

tion circuit. As such, a small input-output (VIN - VOUT)

differential voltage may trigger the device’ s fault protec-

tion circuitry even at low output current.

Undervoltage Lockout

The undervoltage lockout feature prevents faulty operation

by disabling the operation of the regulator when input volt-

age 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.

Figure 2 shows a typical fixed output voltage step-down DC-DC

converter application circuit for ILC6377SO-XX

Fig. 1: Typical step-down wn DC-DC

converter application

0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown

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ILC6377 1.3

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 out-

put current application circuit using an external P-

channel MOSFET is shown in figure 2.

VOUT

ILC6377

(TOP VIE W)

3

45

1

2

6

7

8

+CL

+

VIN

S/D

CSS

SD1

L

*CIN

EXT1

Fi g. 2 1Am p output c ur r ent appli cation

us ing external MOSFET

Figure 3. P-Channel Negative

CBST

Voltage between Vin and

ILC6377

(T OP VI EW )

3

45

1

2

6

7

8

SD1

2200pF

MA729

Schottky

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 neg-

ative; 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.

VOUT

5

6CFB RFB1

RFB2

RFB1 + RFB2 ≤ 2MΩ

CFB chosen so that 1kHz 1

2π× CFB×RFB1×

----------------------------------------------------- 20kHz<<

To pin 8

Fi g.4 Adj ustable output usi ng I LC637 7SO -Adj

( Note : rest o f cir cuit is sa me as Fig.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 < 2MΩ

The feedback compensation capacitor should be chosen

such that the pole frequency f is between 1kHz and 20kHz:

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 = 400kΩ

RFB2 = 200kΩ

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 compo-

nents should be mounted as close to the IC as possible. For

ILC6377SO-Adj, the feedback resistors and their associat-

ed wiring should be kept away from the inductor location

and the vicinity of inductive flux.

1

2 x Π X CFB X RFB1

1kHz< <20kHz

Fig. 2: 1Amp output current application using external MOSFET

Fig. 3: P-Channel Negative

Fig. 4: Adjustable output using ILC6377SO-Adj

(Note: rest of circuit is same as figure 1)

Voltage between VIN and P_BST

must be less than 10V.

0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown

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ILC6377 1.3

Output Voltage vs. Output Current

ILC6377SO-33

ILC6377SO-50

ILC6377SO-33

3.5

3.4

3.3

3.2

3.1

3.0

OUTPUT VOLTAGE: VOUT (V)

0.1 1 10 100 1000

OUTPUT CURRENT: IOUT (mA)

VIN = 3.96

VIN = 3.96 VIN = 4.0V

5.0V

8.0V

10.0V

VIN = 6.0V

8.0V

L = 22µH (CD54)

L = 10µH (CD54)

L = 22µH (CD54)

L = 47µH (CD105)

OUTPUT CURRENT: IOUT (mA)

OUTPUT VOLTAGE: VOUT (V)

3.5

3.4

3.3

3.2

3.1

3.0 0.1 1 10 100 1000

OUTPUT CURRENT: IOUT (mA)

OUTPUT VOLTAGE: VOUT (V)

OUTPUT CURRENT: IOUT (mA)

0.1 1 10 100 1000

3.5

3.4

3.3

3.2

3.1

3.0

OUTPUT VOLTAGE: VOUT (V)

5.4

5.2

5.0

4.8

4.6

4.4 0.1 1 10 100 1000

Typical Performance Characteristics

General conditions for all curves: Circuit of figure 1; L = 20µH (Sumida, CD54), CIN = 47µF (tantalum) with 0.1µF (ceramic),

CL= 47µH (tantalum) MA735 (Matsushita) schottky diode, CSS = 4700pF (ceramic), TA= 25°C unless otherwise noted.

0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown

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ILC6377 1.3

ILC6377SO-50

ILC6377SO-33

ILC6377SO-33 ILC6377SO-33

OUTPUT CURRENT: IOUT (mA)

EFFICIENCY: EFFI(%)

OUTPUT CURRENT: IOUT (mA)

100

80

60

40

20

00.1 1 10 100 1000

6.0V

8.0V

10.0V

8.0V

5.0V

VIN = 3.96

VIN = 4.0

VIN = 6.0V

L = 22µH (CD54)

L = 10µH (CD54) L = 47µH (CD105)

L = 22µH (CD54)

OUTPUT CURRENT: IOUT (mA)

100

80

60

40

20

00.1 1 10 100 1000

100

80

60

40

20

00.1 1 10 100 1000

EFFICIENCY: EFFI(%)

OUTPUT CURRENT: IOUT (mA)

100

80

60

40

20

00.1 1 10 100 1000

EFFICIENCY: EFFI(%)

Typical Performance Characteristics

General conditions for all curves: Circuit of figure 1; L = 20µH (Sumida, CD54), CIN = 47µF (tantalum) with 0.1µF (ceramic),

CL= 47µH (tantalum) MA735 (Matsushita) schottky diode, CSS = 4700pF (ceramic), TA= 25°C unless otherwise noted.

0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown

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ILC6377 1.3

ILC6377SO-33 ILC6377SO-33

AMBIENT TEMP.: Ta(°C)

OUTPUT vs. AMBIENT TEMPERATURE SUPPLY CURRENT vs. AMBIENT TEMPERATURE

LXON RESISTANCE vs. AMBIENT TEMPERATURE

STAND-BY CURRENT vs. AMBIENT TEMPERATURE

OSCILLATION FREQUENCY vs. AMBIENT TEMPERATURE PFM DUTY RATIO vs. AMBIENT TEMPERATURE

3.40

3.35

3.30

3.25

3.20

3.40

3.35

3.30

3.25

3.20

3.40

3.35

3.30

3.25

3.20

3.40

3.35

3.30

3.25

3.20

3.40

3.35

3.30

3.25

3.20

3.40

3.35

3.30

3.25

3.20

-40 -20 0 20 40 60 80

AMBIENT TEMP.: Ta(°C)

OUTPUT VOLTAGE: VOUT1, VOUT2(V)

SUPPLY CURRENT: IDD(µA)

OUTPUT VOLATAGE: VOUT(V)

LXSWITCH RESISTANCE: RSWON(Ω)

PFM DUTY RATIO: PFMDTY(%)

OSCILLATION FREQUENCY: FOSC(kHz)

VOUT2

VOUT1

Typical Performance Characteristics

General conditions for all curves: Circuit of figure 1; L = 20µH (Sumida, CD54), CIN = 47µF (tantalum) with 0.1µF (ceramic),

CL= 47µH (tantalum) MA735 (Matsushita) schottky diode, CSS = 4700pF (ceramic), TA= 25°C unless otherwise noted.

0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown

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ILC6377 1.3

ILC6377SO-33 ILC6377SO-33

ILC6377SO-33

EFFICIENCY vs. AMBIENT TEMPERATURE MINIMUM OPERATING VOLTAGE vs. AMBIENT TEMPERATURE

SOFT-START TIME vs. AMBIENT TEMPERATURE CE “L” VOLTAGE vs. AMBIENT TEMPERATURE

CE “H” VOLTAGE vs. AMBIENT TEMPERATURE

CE “H” VOLTAGE: VCEH(V) SOFT-START TIME: TSS(V)

CE “L” VOLTAGE: VCEL(V)

EFFICIENCY: EFFI(%)

MIN. OPERATING VOLTAGE: VOUT(V)

-40 -20 0 20 40 60 80 -40 -20 0 20 40 60 80

-40 -20 0 20 40 60 80

AMBIENT TEMP.: Ta(°C)

1.0

0.8

0.6

0.4

0.2

0.0

16

12

8

4

0

100

90

80

70

60

50

1.0

0.8

0.6

0.4

0.2

0.0

1.8

1.6

1.4

1.2

1.0

0.8

Typical Performance Characteristics

General conditions for all curves: Circuit of figure 1; L = 20µH (Sumida, CD54), CIN = 47µF (tantalum) with 0.1µF (ceramic),

CL= 47µH (tantalum) MA735 (Matsushita) schottky diode, CSS = 4700pF (ceramic), TA= 25°C unless otherwise noted.

0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown

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ILC6377 1.3

ILC6377SO-33 ILC6377SO-33

ILC6377SO-33

TIME (0.5msec/div)

TIME (0.5msec/div) TIME (0.5msec/div)

OUTPUT VOLTAGE VOUT(V)

OUTPUTCURRENT IOUT(mA)

OUTPUTCURRENT IOUT(mA) OUTPUTCURRENT IOUT(mA)

OUTPUTCURRENT IOUT(mA)

OUTPUT VOLTAGE VOUT(V)

3.4

3.3

3.2

3.1

3.0

2.9

3.4

3.3

3.2

3.1

3.0

2.9

3.4

3.3

3.2

3.1

3.0

2.9

3.4

3.3

3.2

3.1

3.0

2.9

3.4

3.3

3.2

3.1

3.0

2.9

TIME (0.5msec/div)

500

400

300

200

100

0

500

400

300

200

100

0

500

400

300

200

100

0

500

400

300

200

100

0

500

400

300

200

100

0

Output Voltage

Output Current

100mA

300mA 300mA

300mA

100mA

100µA

100µA 100µA

100µA

VIN = 4V, IOUT = 100µA - 100mA

VIN = 4V, IOUT = 100µA - 100mA VIN = 4V, IOUT = 300mA - 100µA

VIN = 4V, IOUT = 300mA - 10mA

VIN = 4V, IOUT = 10mA - 300mA

VIN = 4V, IOUT = 100mA - 100µA

ILC6377SO-33

500

400

300

200

100

0

Typical Performance Characteristics

General conditions for all curves: Circuit of figure 1; L = 20µH (Sumida, CD54), CIN = 47µF (tantalum) with 0.1µF (ceramic),

CL= 47µH (tantalum) MA735 (Matsushita) schottky diode, CSS = 4700pF (ceramic), TA= 25°C unless otherwise noted.