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Semtech Corporation

SC1403 Datasheet Preview

SC1403 Datasheet

Mobile Multi-Output PWM Controller with Virtual Current SenseTM

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SC1403
Mobile Multi-Output PWM Controller
with Virtual Current SenseTM
POWER MANAGEMENT
PRELIMINARY
Description
Features
The SC1403 is a multiple-output power supply controller
designed to power battery operated systems. The
SC1403 provides synchronous rectified buck converter
control for two (3.3 V and 5 V) power supplies. An effi-
ciency of 95% can be achieved for the two supplies. The
SC1403 uses Semtech’s proprietary Virtual Current
SenseTM technology along with external error amplifier
compensation to achieve enhanced stability and DC ac-
curacy over a wide range of output filter components
while maintaining fixed frequency operation. The SC1403
also provides a linear regulator for system housekeep-
ing. The 5 V linear regulator takes its input from the
battery; for efficiency, the output is switched to the 5V
output when available.
Control functions include: power up sequencing, soft
start, power-good signaling, and frequency synchroniza-
tion. Line and load regulation is to +/-1% of the output
voltage. The internal oscillator can be adjusted to 200
kHz or 300 kHz or synchronized to an external clock.
The MOSFET drivers provide >1A peak drive current for
fast MOSFET switching.
The SC1403 includes a PSAVE# input to select pulse
skipping mode for high efficiency at light load, or fixed
frequency mode for low noise operation.
‹ 3.3V and 5V dual synchronous outputs, resistor
programmable to 2.5V
‹ Fixed frequency or PSAVE for maximum efficiency
over wide load current range
‹ 5V / 50mA linear regulator
‹ Virtual Current Sense TM for enhanced stability
‹ Accurate low loss current limiting
‹ Out of phase switching reduces input capacitance
requirements
‹ External compensation supports wide range of
output filter components
‹ Programmable power-up sequence
‹ Power good output
‹ Output overvoltage & overcurrent protection with
output undervoltage shutdown
‹ 4µA typical shutdown current
‹ 6mW typical quiescent power
Applications
‹ Notebook and subnotebook computers
‹ Automotive electronics
‹ Desktop DC-DC converters
Typical Application Circuit
Revision 3, August 2002
SHDN# V+ SYNC VL
4 COMP3
COMP5 5
BST3
BST5
DH3 DH5
L1
PHASE3
PHASE5
DL3 DL5
PGND
CSH3
CSH5
CSL3
CSL5
FB3 FB5
SEQ
ON3 REF
ON5
PSAV#
RST#
GND
1
L2
www.semtech.com




Semtech Corporation

SC1403 Datasheet Preview

SC1403 Datasheet

Mobile Multi-Output PWM Controller with Virtual Current SenseTM

No Preview Available !

SC1403
POWER MANAGEMENT
PRELIMINARY
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.
Parameter
Symbol
Maximum
Units
Supply Voltage, V+ to GND
Boost Voltages, BST3, BST5, to GND
VIN -0.3 to +30 V
-0.3 to +36
V
PGND to GND
± 0.3
V
BST3 to PHASE3; BST5 to PHASE5;
CSL5, CSH5 to GND; CSL3, CSH3 to GND
-0.3 to +6 DC
-2.0 to +7 Transient , 100nS
V
REF, SYNC, SEQ, PSAVE#, ON5, RESET#, VL, FB3,
FB5, COMP3, COMP5 to GND
-0.3V to +6
V
ON3, SHDN# to GND
-0.3V to (V+ + 0.3V)
V
VL, REF Short to GND
Continuous
REF Current
+5 mA
VL Current
+50 mA
Lead Temperature (Soldering) 10 seconds
Storage Temperature Range
Junction Temperature Range
Electrical Characteristics
TLEAD
TSTG
TJ
+300
-65 to +200
+150
°C
°C
°C
Unless otherwise noted: V+ = 15V, both PWMs on, SYNC = 0V, VL load = 0mA, REF load = 0mA, PSAVE# = 0V, TA =-40 to 85°C. Typical values are at
TA = +25°C. Circuit = Typical Application Circuit
Parameter
Conditions
Min Typ Max Units
MAIN SMPS CONTROLLERS
Input Voltage Range
3.3V Output Voltage in
Adjustable Mode
3.3V Output Voltage in
Fixed Mode
5V Output Voltage in
Adjustable Mode
5V Output Voltage in
Fixed Mode
Output Voltage Adjust Range
Adjustable Mode Threshold
Voltage
Load Regulation
Line Regulation
V+ = 6.0 to 30V, CSL3 tied to FB3,
3V Load = 0A to current limit
V+ = 6.0 to 30V, FB3 = 0V,
3V Load = 0A to current limit
V+ = 6.0 to 30V, CSL5 tied to FB5,
5V Load = 0A to current limit
V+ = 6.0 to 30V, FB5 = 0V,
5V Load = 0A to current limit
Either SMPS
Either SMPS, 0A to current limit
Either SMPS, 6.0V < V+ <30; PSAVE# = VL
6.0 30.0
2.45 2.5 2.55
V
V
3.23 3.3 3.37
V
2.45 2.5 2.55
V
4.9 5.0 5.1
V
REF
0.5 0.8
5.5
1.1
V
V
-0.4 %
0.05 %/V
2002 Semtech Corp.
2
www.semtech.com


Part Number SC1403
Description Mobile Multi-Output PWM Controller with Virtual Current SenseTM
Maker Semtech Corporation
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SC1403 Datasheet PDF






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