SC196A Datasheet, PDF (1/17 Pages) Semtech Corporation – 1.5A Synchronous Buck Converter with Integrated Power Devices

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 fixed 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 flexible 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 efficiency 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% efficiency
 1.00V/1.05V/1.20V/1.80V selectable output voltage
 Output current — 1.5A
 Quiescent current — 17µA
 Input range — 2.7V to 5.5V
 Dynamic voltage positioning capability
 Fixed 1MHz frequency or 750kHz to 1.25MHz
synchronized operation
 PSAVE operation to maximize efficiency 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 — 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
V_IN
2.7V to 5.5V
C_IN
10µF
SC196A
VIN
LX
EN
SYNC/PWM
VOUT
VID0
VID1
PGND
MODE
GND
L1
4.7µH
V_OUT
1.05V
1.5A
C_OUT
10µF
November 21, 2006

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