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PDF SC194A Data sheet ( Hoja de datos )
| Número de pieza | SC194A | |
| Descripción | 1A Synchronous Buck Converter | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC194A (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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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 fixed 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 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.
SC194A
1A Synchronous Buck Converter
with Integrated Power Deviceswww.DataSheet4U.com
Features
Up to 93% efficiency
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 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
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 www.semtech.com
1 page  
POWER MANAGEMENT
Block Diagram
EN 4
SC194A
www.DPatRaSEheLeItM4U.IcNomARY
Plimit Amp
Current Amp
1 VIN
SYNC
/PWM 3
OSC & Slope
Generator
PWM
Comp
Control
Logic
10 LX
MODE 2
500mV
Ref
Error Amp
PSAVE
Comp
VID1 7
VID0 6
VOUT 5
Voltage
Select
Nlimit Amp
9 PGND
8 GND
© 2006 Semtech Corp.
5
www.semtech.com
5 Page 
POWER MANAGEMENT
Typical Characteristics
Efficiency vs. Load Current VOUT = 1.8V
100
90
80
VIN=4.2V PSAVE
70 VIN=3.6V PSAVE
60
VIN=2.7V PSAVE
50
VIN=4.2V PWM
40 VIN=3.6V PWM
30 VIN=2.7V PWM
20
10
0
0.0001
0.001
0.01
IOUT (A)
0.1
1
Efficiency vs. Load Current VOUT = 1.2V
100
90
80
70 VIN=4.2V PSAVE
60 VIN=3.6V PSAVE
VIN=2.7V PSAVE
50
40 VIN=4.2V PWM
30 VIN=3.6V PWM
20 VIN=2.7V PWM
10
0
0.0001
0.001
0.01
IOUT (A)
0.1
1
100
95
90
85
80
75
70
2.5
Efficiency vs. Input Voltage
VOUT=1.8V,PWM
VOUT=1.8V,PSAVE
VOUT=1V,PWM
VOUTt=1V,PSAVE
3.0 3.5 4.0 4.5 5.0
Vin(V)
IOUT=500 mA(PWM)/50 mA(PSAVE)
5.5
SC194A
www.DPatRaSEheLeItM4U.IcNomARY
Efficiency vs. Load Current VOUT = 1.5V
100
90
80
70
60
50
40
30
20
10
0
0.0001
VIN=4.2V PSAVE
VIN=3.6V PSAVE
VIN=2.7V PSAVE
VIN=4.2V PWM
VIN=3.6V PWM
VIN=2.7V PWM
0.001
0.01
IOUT (A)
0.1
1
Efficiency vs. Load Current VOUT = 1.0V
100
90
80
VIN=2.7V PSAVE
70
60 VIN=3.6V PSAVE
VIN=2.7V PWM
50 VIN=4.2V PSAVE
40
VIN=3.6V PWM
30
VIN=4.2V PWM
20
10
0
0.0001
0.001
0.01
IOUT (A)
0.1
1
PWM to PSAVE Hysteresis
95
PSAVE Entry for decreasing IOUT
PSAVE Exit for increasing IOUT
90
85 PSAVE Mode IOUT increasing
PSAVE MODE IOUT decreasing
PWM Mode
80
75
70
0.001
0.01
IOUT (A)
0.1
1
© 2006 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet SC194A.PDF ] | |
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