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PDF SC286 Data sheet ( Hoja de datos )
| Número de pieza | SC286 | |
| Descripción | Dual Channel 4A Synchronous Step-Down Regulator | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC286 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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POWER MANAGEMENT
Features
Input Voltage Range — 2.9 to 5.5V
Output Voltage Range — 0.8V to 3.3V
Output Current — up to 4A for each channel
Ultra-Small Footprint — <1mm Height Solution
Switching Frequency — 1.6MHz
Automatic Power Save Mode
Efficiency Up to 95%
Low Output Noise Across Load Range
Excellent Transient Response
Start Up into Pre-Bias Output
Duty-Cycle Low Dropout Operation — 100%
Shutdown Current — <1µA
Externally Programmable Soft Start Time
Power Good indicator
Input Under-Voltage Lockout
Output Over-Voltage, Current Limit Protection
Over-Temperature Protection
Thermally Enhanced 4 x 4 x 0.6 (mm)
MLPQ-UT28 package
Lead-free, Halogen free, and RoHS/WEEE compliant
Applications
Routers and Network Cards
LCD TV
Office Automation
Printers
SC286
Dual Channel 4A Synchronous
Step-Down Regulator
Description
The SC286 is a dual channel 4A synchronous step-down
regulator designed to operate with an input voltage
range of 2.9V to 5.5V. Each channel offers fifteen pre-
determined output voltages via separate control pins
programmable from 0.8 to 3.3 Volts. The control pins
allow for on-the-fly voltage changes, enabling system
designers to implement dynamic power savings. The
device is also capable of adjusting output voltage via an
external resistor divider.
The SC286 is optimized for maximum efficiency over a
wide range of load currents. During full load operation,
the device operates in PWM mode with fixed 1.6MHz
oscillator frequency, allowing the use of small surface
mount external components. As the load decreases, the
regulator will transition into Power Save mode maintain-
ing high efficiency.
Connecting the control pins to logic low forces the device
into shutdown mode reducing the supply current to less
than 1μA. Connecting any of the control pins to logic high
enables the converter and sets the output voltage accord-
ing to Table 1. Other features include under-voltage
lockout, programmable soft-start to limit in-rush current,
power good indicator, over-temperature protection, and
output short circuit protection.
The SC286 is available in a thermally-enhanced, 4 x 4 x 0.6
(mm) MLPQ-UT28 package and has a rated temperature
range of -40 to +85°C.
Typical Application Circuit
VINA
CINA
22µF
RPGOODA
100kΩ
VINB
CINB
22µF
RPGOODB
100kΩ
CTL0A
CTL1A
CTL2A
CTL3A
RAVINA 1Ω
CAVINA0.1µF
RAVINB 1Ω
CAVINB0.1µF
PVINA
LXA
AVINA SC286 VOUTA
AGNDA
PGOODA
PVINB
LXB
VOUTB
SSA
PGNDA
AVINB
AGNDB
PGOODB
CTL0A
CTL1A
CTL2A
CTL3A
SSB
PGNDB
CTL0B
CTL1B
CTL2B
CTL3B
LA 1.0µH
LB 1.0µH
CSSA
1nF
CSSB
1nF
Revision 2.0
© 2011 Semtech Corporation
COUTA
47µF
COUTB
47µF
VOUTA
VOUTB
CTL0B
CTL1B
CTL2B
CTL3B
1 page  
SC286
Pin Descriptions
Pin #
1, 2
3
4
5, 6, 7, 8
9
10
11
12
13, 14
15, 16
17
18
19, 20, 21, 22
23
24
25
26
27, 28
T
Pin Name Pin Function
PVINA
Input supply voltage for the converter power stage
AGNDA
AVINA
CTLXA
PGOODA
SSA
VOUTA
Ground connection for the internal circuitry — AGNDA needs to be connected to PGNDA directly.
Power supply for the internal circuitry — AVINA is required to be connected to PVINA through an R-C filter of
1Ω and 100nF.
Control bit — see Table 1 for decoding. These pins have 500kΩ internal pull-down resistors which are switched
into the circuit whenever CTLXA is low or when the part is in under-voltage lockout.
Power good indicator — when the output voltage reaches the PGOODA threshold, this pin will be open-drain
(after the PGOODA delay), otherwise, it is pulled low internally.
Soft Start — connect a soft-start capacitor to program the soft start time. There is a 5µA charging current
flowing out of the pin.
Output voltage sense pin
PGNDB Ground connection for converter power stage
LXB Switching node — connect an inductor between this pin and the output capacitor.
PVINB
Input supply voltage for the converter power stage
AGNDB Ground connection for the internal circuitry — AGNDB needs to be connected to PGNDB directly.
AVINB
CTLXB
PGOODB
SSB
Power supply for the internal circuitry — AVINB is required to be connected to PVINB through an R-C filter of
1Ω and 100nF.
Control bit — see Table 1 for decoding. These pins have 500kΩ internal pull-down resistors which are switched
into the circuit whenever CTLXB is low or when the part is in under-voltage lockout.
Power good indicator — when the output voltage reaches the PGOODB threshold, this pin will be open-drain
(after the PGOODB delay), otherwise, it is pulled low internally.
Soft Start — connect a soft-start capacitor to program the soft start time. There is a 5µA charging current
flowing out of the pin.
VOUTB Output voltage sense pin
PGNDA Ground connection for converter power stage
LXA Switching node — connect an inductor between this pin and the output capacitor.
Thermal Pad Thermal pad for heat sinking purposes — recommend to connect to PGND. It is not connected internally.
5 Page 
SC286
Typical Characteristics (continued)
Circuit Conditions: CIN = 22µF/6.3V, COUT = 2 x 22µF/6.3V, CSS = 10nF. Unless otherwise noted, L = 1.0µH (TOKO: FDV0530S-1R0), each device
Output Short Circuit
Recovery from Short Circuit
VIN = 5V; VOUT = 1.5V
VIN = 5V; VOUT = 1.5V
VLX (5V/div)
PGOOD (5V/div)
VOUT (1V/div)
VLX (5V/div)
PGOOD (5V/div)
VOUT (1V/div)
IOUT (5V/div)
Time (20µs��/d��iv��)
Output Short Circuit
VIN = 5V; VOUT = 3.3V
VLX (5V/div)
VOUT (2V/div)
IOUT (5V/div)
Time (20µs��/d��iv��)
IOUT (2V/div)
Time (20µs��/d��iv��)
Recovery from Short Circuit
VIN = 5V; VOUT = 3.3V
VLX (5V/div)
PGOOD (5V/div)
VOUT (2V/div)
IOUT (2V/div)
Time (20µs��/d��iv��)
Transient Response (VOUT=1.5V, ISTEP=2A)
VIN = 5V; IOUT = 1A to 3A to 1A
Transient Response (VOUT=3.3V, ISTEP=2A)
VIN = 5V; IOUT = 1A to 3A to 1A
VOUT (100mV/div)
VOUT (100mV/div)
IOUT (1A/div)
Time (20µs��/d��iv��)
IOUT (1A/div)
Time (20µs��/d��iv��)
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet SC286.PDF ] | |
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