Impala Linear Corporation
ILC6375
1 Amp SOT-89 Step Down PWM Switcher Controller
General Description
The ILC6375 is a high efficiency step-down DC-DC con-
troller using a PWM control scheme. The typical efficiency
can be as high as 85% to 90% at 10mA to 1 Amp load.
The ILC6375 drives an external switching transistor to
deliver up to 1 Amp of output current. The internal oscillator
operates at a fixed 100kHz frequency. Meanwhile, the
device is capable of 100% duty cycle thus allowing true low
drop-out operation to maximize battery life in portable
applications. Output voltage is trimmed to 鹵2.5% accuracy.
The device includes internal phase compensation and soft-
start circuitry. Available in a tiny SOT-89 package, the
ILC6375 requires an external PNP switching transisitor, an
inductor, a shottky diode and capacitors.
Features
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Up to 1 Amp output current
85% to 90% efficiency at 0.5A to1A (V
IN
= 7V, V
OUT
= 5V)
85% efficiency at 10mA (V
IN
= 7V, V
OUT
= 5V)
100% Duty Cycle for ultra low drop-out
100kHz 鹵15% internal oscillator
10V(max) input voltage
鹵2.5% precision output
Tiny SOT-89 package
Applications
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Cellular Phones
Palmtop PCs and PDAs
Portable instrumentation
Digital cameras
High efficiency 5V to 3.3V converter
Block Diagram
V
DD
V
I N
Slow Start
V
re f
P WM Co ntrol led
BUFFE R
OSC
100kHz
P WM comp
V
OUT
Ordering Information*
ILC6375CP-33
3.3V+2.5% @100kHz external xtor
ILC6375CP-50
5.5V+2.5% @100kHz external xtor
* Standard product offering comes in tape & reel, quantity
1000 per reel, orientation right for SOT-89
EXT
+
-
Typical Application
L
Tr
3
2
1
Pin Package Configuration
GN D
V
OUT
5V/1A
5
EXT
4
SOT -89-5
(TOP V IEW)
1
2
3
C
I N
V
I N
( 10V )
+
R
B
4
ILC6375
5
SD
+
N/C
C
L
V
IN
V
O UT
ILC6375
GND
Impala Linear Corporation
ILC6375 1.1
(408) 574-3939
www.impalalinear.com
June 1999
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