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Semtech Corporation

SC1404 Datasheet Preview

SC1404 Datasheet

Mobile Multi-Output PWM Controller

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SC1404
Mobile Multi-Output PWM Controller
with Virtual Current SenseTM
POWER MANAGEMENT
Description
Features
The SC1404 is a multiple-output power supply controller designed
to power battery operated systems. The SC1404 provides syn-
chronous rectified buck converter control for two power supplies.
An efficiency of 95% can be achieved. The SC1404 uses
Semtech’s proprietary Virtual Current SenseTM technology along
with external error amplifier compensation to achieve enhanced
stability and DC accuracy over a wide range of output filter compo-
nents while maintaining fixed frequency operation. The SC1404
also provides two linear regulators for system housekeeping. The
5V linear regulator takes its input from the battery; for efficiency,
the output is switched to the 5V output when available. The 12V
linear regulator output is generated from a coupled inductor off
the 5V switching regulator.
Control functions include: power up sequencing, soft start, power-
good signaling, and frequency synchronization. Line and load
regulation is to +/-1% of the output voltage. The internal oscilla-
tor can be adjusted to 200 kHz or 300 kHz or synchronized to an
external clock. The MOSFET drivers provide >1A peak drive cur-
rent for fast MOSFET switching.
The SC1404 includes a PSAVE# input to select pulse skipping
mode for high efficiency at light load, or fixed frequency mode for
low noise operation.
6 to 30V input range (operation possible below 6V)
3.3V and 5V dual synchronous outputs
Fixed-frequency or PSAVE for maximum efficiency over
wide load current range
5V/50mA linear regulator
12V/200mA linear regulator
Virtual Current Sense TM for enhanced stability
Accurate low-loss current limiting
Out-of-phase switching reduces input capacitance
External compensation supports wide range of
output filter components for reduced cost
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
IN P U T + 6V to + 30V
S C 1404 O N /O F F
10
0.22uF
S C 1404 O N /O F F
+3V O U TP U T
+
0.1uF
L1
3V O N /O F F
5V O N /O F F
0.1uF
U4
22 V+
23 SHDN
3 COMP3
C7
25 BST3
27 DH3
26 PHASE3
24 DL3
SC1404
1 CSH3
2 CSL3
28 RUN/ON3
7 ON5
12OUT 4
VDD 5
COMP5 12
C11
BST5 18
0.1uF
DH5 16
PHASE5 17
DL5 19
PGND 20
CSH5
CSL5
14
13
SEQ
REF
15
9
RESET 11
+5V A LW A Y S O N
0.1uF
+
4.7uF
+12V O U TP U T
+ 4.7uF
0.1uF
+
2.2uF
T1
+5V O U TP U T
+
+
0.1uF
+ 2.5V R E F
POW ER GOOD
Revision 4, July 2003
1
www.semtech.com




Semtech Corporation

SC1404 Datasheet Preview

SC1404 Datasheet

Mobile Multi-Output PWM Controller

No Preview Available !

SC1404
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
DESCRIPTION
MAXIMUM
UNITS
VDD, V+, PHASE3, PHASE5 to GND
PHASE3, PHASE5 to GND
BST3, BST5, DH3, DH5 to GND
PGND to GND
Supply and Phase Voltages
Phase Voltages
Boost voltages
Power Ground to Signal Ground
-0.3 to +30
-2.0 (transient - 100 nsec)
-0.3 to +36
± 0.3
V
V
V
V
VL to GND
BST3 to PHASE3; BST5 to PHASE5;
Logic Supply
High-side Gate Drive Supply
-0.3 to +6
-0.3 to +6
V
V
DH3 to PHASE3; DH5 to PHASE5
DL3, DL5 to GND
CSL5, CSH5, CSL3, CSH3 to GND
REF, SYNC, SEQ, PSAVE#, ON5, RESET#,
VL, FB3, FB5, COMP3, COMP5 to GND
ON3, SHDN# to GND
VL, REF Short to GND
REF Current
VL Current
12OUT to GND
12OUT Short to GND
12OUT Current
TJ
Package Thermal Resistance
High-side Gate Drive Outputs
Low-side Gate Drive Outputs
and Current Sense inputs
Logic inputs/outputs
12V output current
Junction Temperature Range
junction to ambient
-0.3 to (+BSTx + 0.3)
-0.3 to +(VL + 0.3)
V
V
-0.3 to +(VL + 0.3)
V
-0.3 to +(V+ + 0.3V)
Continuous
+5
+50
-0.3 to (+VDD + 0.3)
Continuous
+200
+150
76
V
mA
mA
V
mA
°C
°C/Watt
TS
Storage Temperature Range
-65 to +200
TL
Electrical Characteristics
Lead Temperature
+300 °C, 10 second max.
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
CODE
CONDITIONS
MIN TYP MAX
°C
°C
UNITS
MAIN SMPS CONTROLLERS
Input Voltage Range
VIN
6
30.0
V
3V Output Voltage
V3OUT
V+ = 6.0 to 30V, 3V load = 0A to current limit 3.23 3.3 3.37
V
5V Output Voltage
V5OUT
V+ = 6.0 to 30V, 5V load = 0A to current limit 4.9 5.0 5.1
V
Load Regulation
V3LDRG
V5LDRG
Either SMPS, 0A to current limit, PSAVE# = VL
-0.4
%
Line Regulation
2003 Semtech Corp.
V3LIRG
V5LIRG
Either SMPS, 6.0 < V+ < 30V, PSAVE# = VL
2
0.05
%/V
www.semtech.com


Part Number SC1404
Description Mobile Multi-Output PWM Controller
Maker Semtech Corporation
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SC1404 Datasheet PDF






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