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SC196A_08 Datasheet, PDF (1/17 Pages) Semtech Corporation – 1.5A Synchronous Buck Converter with Integrated Power Devices | |||
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POWER MANAGEMENT
Description
The SC196A is a synchronous step-down converter with
integrated power devices. The SC196A is designed for
single-cell Li-Ion battery applications but can also be used
in ï¬xed 3.3V or 5V applications. The switching frequency
is nominally set to 1MHz, allowing the use of small
inductors and capacitors. The maximum current rating of
the internal MOSFET switches allows a DC output current
of 1.5A.
Four programable output voltages 1.00V/1.05V/1.20V/
1.80V are available. See SC196 with external feedback
for other output voltage settings.
The SC196A has a ï¬exible clocking methodology that
allows it to be synchronized to an external oscillator or
controlled by the internal oscillator. The device can
operate in either forced PWM mode or in PSAVE mode. If
PSAVE mode is enabled, the part will automatically enter
PFM at light loads to maintain maximum efï¬ciency across
the full load range.
For noise sensitive applications, PSAVE mode can be
disabled by synchronizing to an external oscillator or
pulling the SYNC/PWM pin high. Shutdown turns off all
the control circuitry to achieve a typical shutdown current
of 0.1μA.
SC196A
1.5A Synchronous Buck Converter
with Integrated Power Devices
Features
 Up to 93% efï¬ciency
 1.00V/1.05V/1.20V/1.80V selectable output voltage
 Output current â 1.5A
 Quiescent current â 17μA
 Input range â 2.7V to 5.5V
 Dynamic voltage positioning capability
 Fixed 1MHz frequency or 750kHz to 1.25MHz
synchronized operation
 PSAVE operation to maximize efï¬ciency at light loads
 Minimal external components
 Fast transient response
 100% duty cycle in dropout
 Soft-start
 Over-temperature and short-circuit protection
 Space-saving lead-free package â MLP-10, 3 x 3mm
Applications
 Cell phones
 Wireless communication chipset power
 Personal media player
 Notebook and sub-notebook computers
 PDAs and mobile communicators
 WLAN peripherals
Typical Application Circuit
VIN
2.7V to 5.5V
CIN
10μF
SC196A
VIN
LX
EN
SYNC/PWM
VOUT
VID0
VID1
PGND
MODE
GND
L1
4.7μH
VOUT
1.05V
1.5A
COUT
10μF
July 14, 2008
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www.semtech.com
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