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SC1102A Datasheet Preview

SC1102A Datasheet

Synchronous Voltage Mode Controller

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SC1102/SC1102A
Synchronous Voltage Mode Controller
for Distributed Power Supply Applications
POWER MANAGEMENT
Description
Features
The SC1102 and SC1102A are low-cost, full featured,
synchronous voltage-mode controllers designed for use
in single ended power supply applications where efficiency
is of primary concern. Synchronous operation allows for
the elimination of heat sinks in many applications. The
SC1102s are ideal for implementing DC/DC converters
needed to power advanced microprocessors in low cost
systems, or in distributed power applications where effi-
ciency is important. Internal level-shift, high-side drive
circuitry, and preset shoot-thru control, allows the use of
inexpensive N-channel power switches.
SC1102s features include temperature compensated
voltage reference, triangle wave oscillator and current
sense comparator circuitry. Power good signaling, shut-
down, and over voltage protection are also provided.
The SC1102 operates at a fixed frequency of 200kHz
and the SC1102A at 500kHz, providing a choice for op-
timum compromise between efficiency, external compo-
nent size, and cost.
‹ 1.265V reference available
‹ Synchronous operation for high efficiency (95%)
‹ RDS(ON) current sensing
‹ On-chip power good and OVP functions
‹ Small size with minimum external components
‹ Soft Start
‹ Enable function
‹ 14 Pin SOIC lead free package available. Fully
WEEE and RoHS compliant
Applications
‹ Microprocessor core supply
‹ Low cost synchronous applications
‹ Voltage Regulator Modules (VRM)
‹ DDR termination supplies
‹ Networking power supplies
‹ Sequenced power supplies
Two SC1102s can be used together to sequence power
up of telecom systems. The power good of the first
SC1102 connected to the enable of the second SC1102
makes this possible.
Typical Application Circuit
Typical Distributed Power Supply
+5V
R1 R2
1k
PWRGD
OVP
0.1
C1
opt. C2
0.1
R4
10 U1
SC1102
1 VCC
GND
14
2 PWRGD
SS/SHDN 13
R3
1k
3 OVP
VREF 12
4 OCSET
SENSE 11
5 PHASE
D1
MBR0520 6 DRVH
BSTH 10
BSTL 9
7 PGND
DRVL 8
C3
0.1
SHDN
VREF
+12V
C4
1.0
R5
3.9
R6
2.2
+
C5 C6 C7 C8 Vin 5V
10.0 680/6.3V 680/6.3V 680/6.3V
_
Q1
STP40NE
Q2
STP40NE
L2u1H
R1284*
R7
127
C9
180/4V
C10
180/4V
C11
180/4V
C12
180/4V
+
C13
180/4V
Vout=2.5V*
_
Figure 1.
NOTE:
*) Vout = 1.265 x (1+R8/R7)
Revision: January 5, 2006
1
www.semtech.com




Semtech Corporation

SC1102A Datasheet Preview

SC1102A Datasheet

Synchronous Voltage Mode Controller

No Preview Available !

SC1102/SC1102A
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified
in the Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device
reliability.
Parameter
Symbol
Maximum
Units
VCC, BSTL to GND
PGND to GND
PHASE to GND (1)
VIN -1.0 to 14
± 0.5
-0.5 to 18
V
V
V
BSTH to PHASE
14
Thermal Resistance Junction to Case
Thermal Resistance Junction to Ambient
Operating Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering) 10 Sec.
Note: (1) -1.5V to 20V for 25ns repetitive every cycle.
θJC
θJA
TA
TJ
TSTG
TLEAD
45
115
0 to 70
125
-65 to +150
300
Electrical Characteristics
Unless specified: VCC = 4.75V to 12.6V; GND = PGND = 0V; FB = VO; VBSTL = 12V; V =BSTH-PHASE 12V; TJ = 25oC
Parameter
Conditions
Min Typ
V
°C/W
°C/W
°C
°C
°C
°C
Max Units
Power Supply
Supply Voltage
Supply Current
Line Regulation
VCC
EN = VCC
VO = 2.5V
4.2 12.6 V
6 10 mA
0.5 %
Error Amplifier
Gain (AOL)
Input Bias
35 dB
5 8 µA
Oscillator
Oscillator Frequency
Oscillator Max Duty Cycle
MOSFET Drivers
SC1102
SC1102A
170 200 230 kHz
425 500 575
90 95
%
DH Source/Sink
DL Source/Sink
BSTH - DH = 4.5V,
DH- PHASE = 2V
BSTL - DL = 4.5V.
DL - PGND. = 2V
1
1
A
A
2006 Semtech Corp.
2
www.semtech.com


Part Number SC1102A
Description Synchronous Voltage Mode Controller
Maker Semtech Corporation
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SC1102A Datasheet PDF






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