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ILC6377 Datasheet(PDF) 1 Page - Impala Linear Corporation

Part No. ILC6377
Description  0.5A, 300KHZ, SO-8 PWM/PFM STEP DOWN CONVERTER WITH SHUTDOWN
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Maker  IMPALA [Impala Linear Corporation]
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ILC6377 Datasheet(HTML) 1 Page - Impala Linear Corporation

 
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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
P rotection
LX
GND
EXT1
RAMP WAVE
VIN
VOUT
P_BST
GATE
DRIV ER
GENERATOR,
OSCILLATOR
CONTROLLER
+
-
PWM
Comp
EXT2
+
-
Error
Amp
1
5
4
6
3
2
7
8
S/ D,
So ftstar t,
Vref
S/D,
Vref
with
Soft-
start
ILC6377
(TOP VIE W)
3
45
1
2
6
7
8
L X
FB
EXT1
S/D,
GND
P_BST
EXT2
V
IN
ILC6377SO- Adj
C
SS
SO- 8 Package
ILC6377
(TOP VIE W)
3
L X
V
OUT
EXT1
45
S/D,
GND
1
2
6
7
8
P_BST
EXT2
V
IN
C
SS
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 converter
Pin
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 voltage sense pin for
ILC6377SO-XX; 1V feedback for
ILC6377SO adj
6
GND
Ground connection
7
EXT1
External gate drive pin (low when
P-Ch FET is on)
8
LX
Inductor switch pin
ILC6377
0.5A, 300kHz, SO-8 PWM/PFM Step Down
Converter with Shutdown
Impala Linear Corporation
General Description
Features
Applications
Block Diagram
Pin Package Configurations
Pin Description


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