SC192 Datasheet, PDF (1/15 Pages) Semtech Corporation – Synchronous Buck Converter with Integrated Power Devices

SC192
Synchronous Buck Converter
with Integrated Power Devices
POWER MANAGEMENT
Description
The SC192 is a synchronous step-down converter with
integrated power devices designed for battery operated
systems. The internal power switches reduce system
size and cost. In addition, an efficiency of 95% can be
achieved for significant line and load ranges. The SC192
is designed for single-cell Li-Ion battery applications, but
also performs well in fixed 3.3V or 5V input circuits.
The SC192 has a flexible clocking scheme. It can be
synchronized to an external oscillator, fixed to the inter-
nal oscillator, or allowed to modulate the frequency dur-
ing light loads (PSAVE) for maximum battery life, by the
method called pulse frequency modulation (PFM). Shut-
down places the switches in a high impedance state and
turns off all control circuitry to achieve a typical quies-
cent current of 0.1μA.
Line and load regulation is to +/-0.5% of the output volt-
age. The internal MOSFET switches provide >1A peak
current to provide a DC output of at least 700mA.
Grounding the ILIM pin reduces the current limit by half.
Features
‹ 2.7V to 7V Input Range
‹ Output Adjustable from 0.75V to Vin
‹ Fixed Frequency or PSAVE for Maximum
Efficiency Over Wide Load Current Range
‹ 700mA Guaranteed Output Current
‹ No Schottky Diode Required
‹ 35μA Quiescent Current
‹ 100% Duty Cycle in Dropout
‹ 95% Efficiency
‹ Fast Transient Response
‹ Over Temperature Protection
‹ Space-saving Micro Lead-Frame Package
MLPD-10 3x3
Applications
‹ Cell Phones
‹ Cordless Phones
‹ Notebook and Subnotebook Computers
‹ PDAs and Mobile Communicators
‹ 1 Li-Ion or 3 NiMH/NiCd Powered Devices
The SC192 can achieve 100% duty cycle for excellent
low dropout performance and comes in a tiny MLPD-10,
3 x 3 package having a maximum height of 1mm.
Typical Application Circuit
Vin = 2.7V to 7V
C1
C3
SC192
L1
1
VIN
9
LX
8
EN
6
ILIM
ADJ ⁵
2
BP
3
GND
10
PGND
7
SYNC/PWM
C4
R8
4
COMP
Vout = 0.75V to Vin
C5
R1
C6
R2
Revision 8, March 26, 2007
1
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