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| SC194A Datasheet, PDF (1/17 Pages) Semtech Corporation – 1A Synchronous Buck Converter with Integrated Power Devices | |||
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SC194A
1A Synchronous Buck Converter
with Integrated Power Devices
POWER MANAGEMENT
Description
The SC194A is a synchronous step-down converter with
integrated power devices. The SC194A 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 1.3A maximum current rating of the
internal MOSFET switches allows a DC output current of
1A.
The SC194A 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.
Features
 Up to 93% efï¬ciency
 Output current - 1A
 Input range - 2.7V to 5.5V
 Quiescent current - 17μA
 Four selectable output voltages
 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 - 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
SC194A
VIN
LX
EN
SYNC/PWM
VOUT
VID0
VID1
PGND
MODE
GND
L1
4.7μH
COUT
VOUT
1.8V
1A
10μF
July 05, 2006
1
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