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PDF SC283 Data sheet ( Hoja de datos )
| Número de pieza | SC283 | |
| Descripción | 1.8A Synchronous Step-Down Regulator | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC283 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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SC283
POWER MANAGEMENT
Features
Dual Channel 2.5MHz, 1.8A
Synchronous Step-Down Regulator
Description
VIN Range: 2.9 – 5.5V
VOUT Selectable: 0.8 - 3.3V
Up to 1.8A Output Current for Each Channel
Ultra-Small Footprint, <1mm Height Solution
2.5MHz Switching Frequency
Efficiency Up to 93%
Low Output Noise Across Load Range
Excellent Transient Response
Start Up into Pre-Bias Output
100% Duty-Cycle Low Dropout Operation
<1µA Shutdown Current
Internal Soft Start
Input Under-Voltage Lockout
Output Over-Voltage, Current Limit Protection
Over-Temperature Protection
Adjustable Output Voltage
2mm x 3mm x 0.8mm thermally enhanced
MLPQ-W18 package
-40 to +85°C Temperature Range
Pb-Free product. RoHS/WEEE and Halogen Free com-
pliant
Applications
The SC283 is a dual channel 1.8A synchronous step-
down regulator designed to operate with an input
voltage range of 2.9 to 5.5 Volts. Each channel offers
fifteen pre-determined output voltages via four 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
SC283 is also capable of adjusting the output voltage via
an external resistor divider.
The device operates with a fixed 2.5MHz oscillator
frequency, allowing the use of small surface mount
external components.
Connecting CTL0 — CTL3 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
according to Table 1. Other features include under-
voltage lockout, soft-start to limit inrush current, and
over-temperature protection.
The SC283 is available in a thermally-enhanced, 2mm
x 3mm x 0.8mm MLPQ-W18 package and has a rated
temperature range of -40 to +85°C.
Desktop Computing
Set-Top Box
LCD TV
Network Cards
Printer
Typical Application Circuit
July 20, 2010
www.DataSheet.in
www.semtech.com
1 page  
SC283
Typical Characteristics
Circuit Conditions: CIN= 10uF/6.3V; COUT= 22uF/6.3V, Unless otherwise noted, L= 2.2uH (TOKO: 1127AS-2R2M).
Efficiency vEs.ffLicoieancdy Current
Total Loss (Per ChaTnontael Ll)osvss. Load Current
100%
95%
90%
VIN=5.0V;VOUT=3.3V
1000
800
TA=25°C
VIN=5.0V;VOUT=3.3V
85%
80%
75%
VIN=3.3V;VOUT=1.5V
600
VIN=3.3V;VOUT=1.5V
400
70%
65%
TA=25°C
60%
0.0
0.3
VIN=5.0V;VOUT=1.5V
0.6 0.9 1.2 1.5 1.8
Output Current (A)
200
VIN=5.0V;VOUT=1.5V
0
0.0 0.3 0.6 0.9 1.2 1.5
Output Current (A)
1.8
LoadLoRaed gReuglualatitioonn
1.0%
0.8%
TA=25°C
0.6%
0.4%
VIN=3.3V;VOUT=1.5V
0.2%
0.0%
VIN=5.0V;VOUT=1.5V
-0.2%
-0.4%
-0.6%
-0.8%
VIN=5.0V;VOUT=3.3V
-1.0%
0.0 0.3 0.6 0.9 1.2 1.5
Output Current (A)
1.8
UVLOURViLsOinRgisiTnhg rTehsrehshoolldd VVaariraitaiotnion
1.0%
0.8%
0.6%
0.4%
0.2%
0.0%
-0.2%
-0.4%
-0.6%
-0.8% IOUT= 0A
-1.0%
-40
-15
10 35
Ambient Temperature (°C)
60
© 2010 Semtech Corp.
www.DataSheet.in
85
Dropout Voltage in 100% Duty Cycle Operation
Dropout Voltage of 100% Duty Cycle Operation
500
450 TA= 25°C
400
L= 1071AS-2R2M
350 (DCR= 60m_max)
300
250
200
150
100 L= 1127AS-2R2M
50 (DCR=48m_max)
0
0.0 0.3 0.6 0.9 1.2 1.5 1.8
Output Current (A)
UVLOUVHLyOsHtyesrteerseissisVVaarriiaatitoinon
5%
4%
3%
2%
1%
0%
-1%
-2%
-3%
-4% IOUT= 0A
-5%
-40 -15
10 35
Ambient Temperature (°C)
60
85
www.semtech.com
5 Page 
Block Diagram
AVIN
VOVOUTUAT
CCTLT0LA0
CTCLT1LA1
CTCLT2LA2
CTCLT3LA3
Oscillator &
Slope
Generator
Current Amp
PPlliimmiitt ACmomp p
Control
Logic
Voltage
Select
PWM
Comp
Error Amp
500mV
Ref
AGND
AVIN
VOVUOTUBT
CCTLT0LB0
CTCLT1LB1
CTCLT2LB2
CTCLT3LB3
Oscillator &
Slope
Generator
Current Amp
PPlliimmiitt ACmomp p
Control
Logic
Voltage
Select
PWM
Comp
Error Amp
500mV
Ref
© 2010 Semtech Corp.
www.DataSheet.in
AGND
11
SC283
VPIVNIAN
LXA
GPGNNDDA
VPIVNIBN
LXB
GPGNNDDB
www.semtech.com
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet SC283.PDF ] | |
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