SC1403 PDF даташит
Спецификация SC1403 изготовлена «Semtech Corporation» и имеет функцию, называемую «Mobile Multi-Output PWM Controller with Virtual Current SenseTM». |
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Детали детали
Номер произв | SC1403 |
Описание | Mobile Multi-Output PWM Controller with Virtual Current SenseTM |
Производители | Semtech Corporation |
логотип |
30 Pages
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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
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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
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SC1403
POWER MANAGEMENT
PRELIMINARY
Electrical Characteristics (Cont.)
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
Current-Limit Threshold
CSH5 -CSL5, CSH3 -CSL3
40 50 70 mV
Negative OC limit Threshold
-50 mV
Zero Crossing Threshold
CSH5 - CSL5, CSH3 - CSL; PSAVE# = 0V,
not tested
5 mV
Soft-Start Ramp Time
Oscillator Frequency
From enable to 95% full current limit with respect to
fOSC
SYNC = VL
SYNC = 0V
Maximum Duty Factor
SYNC = VL
SYNC = 0V
SYNC Input High Pulse
Not Tested
SYNC Input Low Pulse Width
Not Tested
SYNC Rise/Fall Time
Not Tested
SYNC Input Frequency Range
Current-Sense Input Leakage
Current
CSH3 = CSH5 = 5.5V
ERROR AMP
Closed Loop Gain
Closed Loop Bandwidth
Out Resistance
COMP3, COMP5
Offset Voltage
Internal FB - REF
INTERNAL REGULATOR AND REFERENCE
VL Output Voltage
VL Undervoltage Lockout
Fault Threshold
SHDN# = V+; 6V < V+ <30V;
0mA <I LOAD <50mA; ON3 = ON5 = 0V
Falling edge, hysteresis = 0.7V
VL Switchover Lockout
Switchover at startup
REF Output Voltage
No external load
REF Load Regulation
0µA < ILOAD < 50µA
0mA < ILOAD < 5mA
512 clks
220 300 380 kHz
170 200 230
92 94
94 96
%
300 ns
300
200
240 350 kHz
3 10 µA
18 V/V
8 MHz
15 25 35 kΩ
±2 mV
4.6 5.2 V
3.5 3.7 4.0
2.45
4.5
2.5 2.55
12.5
50
mV
2002 Semtech Corp.
3
www.semtech.com
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