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PDF SC3102 Data sheet ( Hoja de datos )
| Número de pieza | SC3102 | |
| Descripción | 2A Synchronous Step-Down Regulator | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC3102 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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POWER MANAGEMENT
Features
VIN Range: 2.9 – 5.5V
Preset VOUT Range: 1.0V to 3.3V
Up to 2A Output Current
Ultra-Small Footprint, <1mm Height
1.5MHz Switching Frequency
Selectable Forced PSAVE or Forced PWM Operation
Efficiency Up to 95%
Low Output Noise Across Load Range
Excellent Transient Response
Start Up into Pre-Bias Output
100% Duty-Cycle Low Dropout Operation
<1μA Shutdown Current
Externally Programmable Soft-Start Time
Power Good indicator
Input Under-Voltage Lockout
Output Over-Voltage, Current Limit Protection
Over-Temperature Protection
3mm x 3mm x 0.6mm thermally enhanced
MLPQ-UT16 package
-40 to +85°C Temperature Range
Pb-free, Halogen free, and RoHS/WEEE compliant
Applications
Office Automation
Switches and Routers
Network Cards
LCD TV
SC3102
2A Synchronous
Step-Down Regulator
Description
The SC3102 is a 2A synchronous step-down regulator
designed to operate with an input voltage range of 2.9V
to 5.5V.The device requires minimal external components
for a complete step down regulator solution. The output
voltage is factory predetermined with an available range
of 1.0V to 3.3V.
The SC3102 is optimized for maximum efficiency over a
wide range of load currents. During full load operation,
the SC3102 operates in forced PWM mode with a fixed
1.5MHz oscillator frequency, allowing the use of small
surface mount external components. As the load
decreases, the regulator has the option to transition, via
the MODE pin, into forced Power Save mode to maximize
efficiency or to stay in forced PWM mode.
The SC3102 offers output short circuit and thermal
protection to safe guard the device under extreme
operating conditions. The enable pin provides on/off
control of the regulator. When connected to logic
low, the device enters shutdown and consumes less
than 1μA of current. Other protection features include
programmable soft-start with Power Good indicator, over
voltage protection and under voltage lockout.
The SC3102 is available in a thermally-enhanced, 3mm
x 3mm x 0.6mm MLPQ-UT16 package and has a rated
temperature range of -40 to +85°C.
Typical Application Circuit
VIN
CIN
10μF
1Ohm
0.1μF
PVIN
LX
AVIN
VOUT
SC3102
PGOOD
EN
MODE
SS
PGND
AGND
CSS
L 1.5μH
VOUT
COUT
47μF
Rev 2.2
© Semtech Corporation
1
1 page  
SC3102
Pin Descriptions
Pin #
1,2
3
4
5
6
7
8
9
10
11,12,13
14,15,16
T
Pin Name Pin Function
PVIN
Input supply voltage for the converter power stage.
AGND Ground connection for the internal circuitry. AGND needs to be connected to PGND directly.
AVIN
Power supply for the internal circuitry. AVIN is required to be connected to PVIN through an R-C filter of 1Ω
and 100nF.
MODE
MODE select pin. When connected to logic high, the device operates in forced PWM mode. When connected
to logic low, it operates in forced PSAVE mode at light load. The MODE pin has a 500kΩ internal pulldown re-
sistor. This resistor is switched in circuit whenever the MODE pin is “Low” or when the part is in undervoltage
lockout or disabled.
Enable pin. When connected to logic high or tied to the AVIN pin, the SC3102 is on. When connected to logic
EN
low, the device enters shutdown and consumes less than 1μA current (typ.). The enable pin has a 500kΩ
internal pulldown resistor. This resistor is switched in circuit whenever the EN pin is “Low” or when the part is
in undervoltage lockout.
PGOOD
NC
SS
Power good indicator. When the output voltage reaches the PGOOD threshold, this pin will be open-drain
(after the PGOOD delay), otherwise it is pulled low internally.
No connection.
Soft-Start. Connect a soft-start capacitor to program the soft-start time. There is a 5μA charging current flow-
ing out of the pin.
VOUT
Output voltage sense pin.
PGND
Ground connection for converter power stage.
LX Switching node - connect an inductor between this pin and the output capacitor.
Thermal Pad Thermal pad for heatsinking purposes. Connection to PGND is recommended. It is not connected internally.
5
5 Page 
SC3102
Typical Waveforms (continued)
Circuit Conditions: CIN= 10μF/6.3V, COUT= 2 x 22μF/6.3V, CSS= 2.2nF, L= 1.5μH.
Load Transient: MODE = High
VIN = 5V, VOUT = 1.5V, IOUT = 400mA to 1.2A
Over-Current Protection: Fold Back
VIN = 5V, VOUT = 1.5V, Load Step = 0A to 3.2A
(100mV/div)
VOUT
(500mV/div) VOUT
(5V/div)
LX
(1A/div)
LOAD STEP
(1A/div)
(1A/div)
INDUCTOR CURRENT
LOAD STEP
Time (10μs/div)
Load Transient: MODE = High
VIN = 5V, VOUT = 1.5V, IOUT = 1.2A to 400mA
(100mV/div)
VOUT
(5V/div)
LX
(1A/div) INDUCTOR CURRENT
(5V/div) LX
Time (5μs/div)
(1A/div) INDUCTOR CURRENT
(1A/div)
Time (10μs/div)
LOAD STEP
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet SC3102.PDF ] | |
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