ILC6375 Datasheet, PDF (1/4 Pages) Impala Linear Corporation – 1 AMP SOT - 89 STEP DOWN PWM SWITCHER CONTROLLER

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 ±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
! 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 ±15% internal oscillator
! 10V(max) input voltage
! ±2.5% precision output
! Tiny SOT-89 package
Applications
! Cellular Phones
! Palmtop PCs and PDAs
! Portable instrumentation
! Digital cameras
! High efficiency 5V to 3.3V converter
Block Diagram
VDD
V_{I N}
BUFFE R
EXT
Slow Start
P WM Co ntrol led
OSC
1 0 0 kH z
Vre f
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
Typical Application
Tr
C_{I N +}
V_{I N}
R_B
( 10V )
L
3
2
1
ILC6375
SD
4
5
GND
V_OUT
5V/1A
+
CL
Pin Package Configuration
GN D
5
EXT
4
SOT -89-5
(TOP V IEW)
1
N/C
2
3
V_IN V_{O UT}
ILC6375
Impala Linear Corporation
ILC6375 1.1
[phone] www.impalalinear.com
June 1999 1