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PDF SC1188 Data sheet ( Hoja de datos )
| Número de pieza | SC1188 | |
| Descripción | Programmable Synchronous DC/DC Converter / Dual Low Dropout Regulator Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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SC1188
Programmable Synchronous DC/DC Converter,
Dual Low Dropout Regulator Controller
POWER MANAGEMENT
Description
Features
The SC1188 combines a synchronous voltage mode con- u Synchronous design, enables no heatsink solution
troller with two low-dropout linear regulators providing u 95% efficiency (switching section)
most of the circuitry necessary to implement three DC/ u 4 bit DAC for output programmability
DC converters for powering advanced, low cost u 1.8V, 2.5V short circuit protected linear controllers
microprocessors.
u VRM8.4 Compliant
The SC1188 switching section features an integrated 4
bit D/A converter, latched drive output for enhanced noise
immunity and pulse by pulse current limiting. The SC1188
switching section operates at a fixed frequency of
200kHz, providing an optimum compromise between
size, efficiency and cost in the intended application ar-
eas. The integrated D/A converter provides program-
mability of output voltage from 1.30V to 2.05V in 50mV
increments with no external components.
The SC1188 linear sections are low dropout regulators
with short circuit protection, supplying 1.8V for Bridge
and 2.5V for non-GTL I/O.
Applications
u Low Cost Motherboards
u 1.3V to 2.05V microprocessor supplies
u Programmable triple power supplies
Typical Application Circuit
12V IN
5V IN
Cin
1500uF
x4
+
VID0
VID1
VID2
VID3
3.3V IN
0.1uF
U5 SC1188CS
5
LDOEN
CS+
16 VID0
15
VID1
14 VID2
13 VID3
CS-
VOSENSE
BST
DH
DL
1 GATE2
4
LDOS2
GND
GATE1
LDOS1
7
6
12
11
10
9
8
2
3
0.1uF
+
47uF
0.1uF
IRLR3103N
2R2
IRLR3103N
2R2
1.9uH
R4 1.00k R5 2.32k
R8 5mOhm
VCC_CORE
R15 R11
C8 +
1500uF
x6
R12
1k
C10
0.1uF
330uF
+
IRLR024N
+
330uF
1.8V OUT
IRLR024N
+
330uF
2.5V OUT
Revision 11/3/2000
1
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1 page  
SC1188
POWER MANAGEMENT
Block Diagram
CS- CS+
VID3
VID2
VID1
VID0
VOSENSE
LDOS1
GATE1
REFERENCE
D/A
CURRENT LIMIT
COMPARATOR
70mV
+
-
+
-
ERROR AMP
-
+
REGULATOR
INTERNAL
BIAS
LEVEL SHIFT
AND HIGH SIDE
MOSFET DRIVE
OSCILLATOR
R
Q
S
SHOOT-THRU
CONTROL
FET
CONTROLLER
2.5V
1.265V
REFERENCE
FET
CONTROLLER
1.8V
SYNCHRONOUS
MOSFET DRIVE
BST
DH
DL
GND
LDOEN
GATE2 LDOS2
Applications Information - Output Voltage Table
Unless specified: VCC = 3.13V to 3.47V; GND = PGND = 0V; VOSENSE = VO; 0mV < (CS+-CS-) < 60mV; BST = 11.4V to 12.6V; TA = 0 to 70°C
Parameter
Conditions
VID
3210
Min.
Typ.
Max.
Output Voltage
IO = 2A in Evaluation Board
1111
1110
1.287
1.336
1.300
1.350
1.313
1.364
1101
1.386
1.400
1.414
1100
1.435
1.450
1.465
1011
1.485
1.500
1.515
1010
1.534
1.550
1.566
1001
1.584
1.600
1.616
1000
1.633
1.650
1.667
0111
1.683
1.700
1.717
0110
1.732
1.750
1.786
0101
1.782
1.800
1.818
0100
1.831
1.850
1.869
0011
1.881
1.900
1.919
0010
1.930
1.950
1.970
0001
1.980
2.000
2.020
0000
2.029
2.050
2.071
Units
V
© 2000 Semtech Corp.
5
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5 Page 
POWER MANAGEMENT
Evaluation Board Schematic
SC1188
© 2000 Semtech Corp.
11
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11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SC1188.PDF ] | |
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