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Semtech Corporation

SC1402 Datasheet Preview

SC1402 Datasheet

Multi-Output/ Low-Noise Power Supply Controller for Notebook Computers

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Multi-Output, Low-Noise Power Supply
Controller for Notebook Computers
SC1402
December 15, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1402 is pin compatible with the MAX1632 with
improved load regulation performance. The SC1402 is
a multiple-output power supply controller designed to
power logic supply components in battery operated
systems. The SC1402 utilizes synchronous rectified
buck topologies to generate two voltages, (3.3V and
5V) with up to 95% efficiency. It also provides two lin-
ear regulators for system housekeeping functions. The
12V linear regulator output is generated from a coupled
inductor of the 5V switching regulator.
Control functions include: power up sequencing, soft
start, power-good signaling, automatic bootstrapping
for high side MOSFETs, and frequency synchroniza-
tion. An internal precision 2.5V reference ensures ±2%
output voltage. The internal oscillator can be adjusted
to 200kHz, 300kHz or synchronized to an external
clock. The MOSFET drivers provide 1A peak drive
current for fast MOSFET switching.
The SC1402 includes a PSAVE enable input to select
a pulse skipping mode for high efficiency or a fixed fre-
quency mode for low noise operation.
FEATURES
= 6V to 30V Input range
= 3.3V and 5V dual synchronous rectified outputs
= Fixed frequency or PSAVE for maximum efficiency
over wide load current range
= 5V/50mA linear regulator
= 12V/120mA linear regulator
= Precision 2.5V reference output
= Programmable power-up sequence
= Power good output (RESET)
= Output over current protection
= Output over voltage protection
= Output under voltage shut down
= 4µA typical shut down current
= 7mW typical quiescent power
APPLICATIONS
= Notebook and subnotebook computers
= PDAs and Mobile communicators
= Desktop DC-DC converters
ORDERING INFORMATION:
DEVICE
PACKAGE(1)
SC1402ISS
SSOP-28
TEMP. (TA)
-40 - +85°C
TYPICAL APPLICATION CIRCUIT
Note:
(1) Only available in tape and reel packaging. (Suffix ‘.TR’).
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320




Semtech Corporation

SC1402 Datasheet Preview

SC1402 Datasheet

Multi-Output/ Low-Noise Power Supply Controller for Notebook Computers

No Preview Available !

Multi-Output, Low-Noise Power Supply
Controller for Notebook Computers
SC1402
December 15, 2000
ABSOLUTE MAXIMUM RATINGS
PARAMETERS
V+, BST3, BST5 to GND
PGND to GND
PHASE3 to BST3, and PHASE5 to BST5
VL to GND
REF,SYNC,SEQ,PSAVE,TIME_ON5,RESET to GND
RUN/ON3, SHDN to GND
VDD to GND
12 Out to GND
VL, REF Short to GND
12 Out Short to GND
REF Current
VL Current
12 Out Current
VDD Shunt Current
TS Storage Temperature
TL Lead soldering temperature
MAXIMUM
-0.3, +36
± 0.3
-6 to +0.3
-0.3 to 6
-0.3 to (VL+.3V)
-0.3 to (V+ + 0.3V)
-0.3 to +30V
-0.3 to (VDD + 0.3V)
Continuous
Continuous
+5
+50
+200
+15
-65 to +150
+300, 10 seconds
UNITS
V
V
V
V
V
V
V
V
sec.
sec.
mA
mA
mA
mA
°C
°C
ELECTRICAL CHARACTERISTICS(1)
(Unless otherwise noted: V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, PSAVE = 0V, TA =-40 to +85°C.
Typical values are at TA = +25°C).
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
MAIN SMPS CONTROLLERS
Input Voltage Range
3V Output Voltage in
V+ = 6V to 30V, CSH3-CSL3 = 0V,
Adjustable Mode
CSL3 tied to FB3
3V Output Voltage in Fixed Mode V+ = 6V to 30V, 0mV < CSH3-CSL3 < 80mV,
FB3 = 0V
5V Output Voltage in Adjustable V+ = 6V to 30V, CSH5-CSL5 = 0V,
Mode
CSL5 tied to FB5
5V Output Voltage in Fixed Mode V+ = 6V to 30V, 0mV < CSH5-CSL5 < 80mV,
FB5 = 0V
Output Voltage Adjust Range
Either SMPS
6.0
2.45
3.17
2.45
4.82
REF
2.5
3.3
2.5
5.0
30.0
2.55
3.43
2.55
5.18
5.5
V
V
V
V
V
V
Adjustable-Mode Threshold
Voltage
Load Regulation
Dual Mode comparator
Either SMPS, 0V < CSH_-CSL_ < 80mV
0.5 1.3
-0.8
V
%
Line Regulation
Either SMPS, 6V < V+ < 30V
0.03
%/V
Current-Limit Threshold
PSAVE Mode Threshold
CSH3-CSL3 or CSH5-CSL5
PSAVE = VL or V12OUT < 11.9V
PSAVE = 0V, not tested
80 100 120
-50 -100 -150
10 25
40
mV
mV
Soft-Start Ramp Time
Oscillator Frequency
Maximum Duty Factor
From enable to 95% full current limit with
respect to fOSC Note 2.
SYNC = VL
SYNC = 0V
SYNC = VL
SYNC = 0V
512
270 300
170 200
94
96
330
235
clks
kHz
%
2
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320


Part Number SC1402
Description Multi-Output/ Low-Noise Power Supply Controller for Notebook Computers
Maker Semtech Corporation
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SC1402 Datasheet PDF






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