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PDF SC195 Data sheet ( Hoja de datos )
| Número de pieza | SC195 | |
| Descripción | 500mA Synchronous Step Down DC-DC Regulator | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC195 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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POWER MANAGEMENT
Features
Input Voltage — 2.9V to 5.5V
Output Voltage — 0.8V to 3.3V
Output current capability — 500mA
Efficiency up to 94%
15 Programmable output voltages
High light-load efficiency via automatic PSAVE mode
Fast transient response
Temperature range — -40 to +85°C
Oscillator frequency — 3.5MHz
100% duty cycle capability
Quiescent current — 38μA typ
Shutdown Current — 0.1μA typ
Internal soft-start
Over-voltage protection
Current limit and short circuit protection
Over-temperature protection
Under-voltage lockout
Floating control pin protection
MLPQ-UT8 1.5 x 1.5 x 0.6 (mm) package
Pb free, Halogen free, and RoHS/WEEE compliant
Applications
Smart phones and cellular phones
MP3/Personal media players
Personal navigation devices
Digital cameras
Single Li-ion cell or 3 NiMH/NiCd cell devices
Devices with 3.3V or 5V internal power rails
SC195
3.5MHz, 500mAwwSwy.DantacShheert4oU.ncoom us
Step Down DC-DC Regulator
Description
The SC195 is a high efficiency, 500mA step down regula-
tor designed to operate with an input voltage range of
2.9V to 5.5 V. Four control logic pins are used to select the
output voltage, eliminating the need for external feed-
back resistors. The control pins allow the output voltage
to be set to a single level or controlled dynamically.
Fifteen different output voltages can be selected. Pulling
all four control pins low disables the output.
The SC195 operates at a fixed 3.5MHz switching fre-
quency, minimizing the size and cost of external
components. A power-save (PSAVE) mode is used to opti-
mize efficiency at light loads for each output setting.
Hysteresis is included to prevent chattering between
PSAVE and normal pulse-width modulation (PWM)
mode.
The SC195 provides short-circuit and thermal protection
to safeguard the device under extreme operating condi-
tions. Other features include internal soft-start circuitry,
limiting in-rush current, and under-voltage lockout, pre-
venting the device from malfunction when the input
voltage drops below the rated minimum level. These fea-
tures coupled with the tiny 1.5x1.5x0.6 (mm) package
make the SC195 a versatile product well suited for porta-
ble applications.
Typical Application Circuit
VIN
2.9V to 5.5V
Control Logic
Lines
CIN
4.7μF
SC195
IN
LX
OUT
CTL3
CTL2
CTL1
CTL0
GND
LX
1.0μH
VOUT
0.8V to 3.3V
COUT
10μF
September 23, 2009
© 2009 Semtech Corporation
1
1 page  
SC195
www.DataSheet4U.com
Typical Characteristics
V = 4.0V for V = 3.3V, V = 3.6V for all others. C = 4.7μF, C = 10μF, L = 1μH, T = 25°C unless otherwise noted.
IN OUT IN
IN OUT X A
Efficiency vs. I (T = -40°C)
OUT A
Efficiency vs. VOUT (TA = -40°C)
100
90
80
70
60
50
40
30
20
10
0
0.1
3.3V
2.8V
1.8V
1V
1
10
Load Current (mA)
100
1000
100 IOUT = 200mA
95
90
85
80
75
70
65
0.5
1
1.5 2 2.5
VOUT (V)
3
3.6V
4.2V
5.0V
3.5
Efficiency vs. I (T = 25°C)
OUT A
100
90
80
70
60
50
40
30
20
10
0
0.1
3.3V
2.8V
1.8V
1V
1
10
Load Current (mA)
100
1000
Efficiency vs. V (T = 25°C)
OUT A
100 IOUT = 200mA
95
90
85
80
75
70
65
0.5
1
1.5 2 2.5
VOUT (V)
3
3.6V
4.2V
5.0V
3.5
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs. I (T = 85°C)
OUT A
3.3V
2.8V
1.8V
1V
1 10 100
Load Current (mA)
1000
Efficiency vs. VOUT (TA = 85°C)
100 IOUT = 200mA
95
90
85
80
75
70
65
0.5 1 1.5 2 2.5 3
VOUT (V)
3.6V
4.2V
5.0V
3.5
5
5 Page 
Block Diagram
SC195
www.DataSheet4U.com
Plimit Amp
Current Amp
8 IN
OSC & Slope
Generator
500mV
Ref
CTL3 4
CTL2 3
CTL1 2
CTL0 1
OUT 5
Voltage
Select
PWM
Comp
Error Amp
PSAVE
Comp
Control
Logic
Nlimit Amp
7 LX
6 GND
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet SC195.PDF ] | |
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