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LTC1703 Datasheet

  • LTC1703

  • Dual 550kHz Synchronous 2-Phase Switching Regulator Controll...

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LTC1703
Dual 550kHz Synchronous
2-Phase Switching Regulator
Controller with 5-Bit VID
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
Two Independent PWM Controllers in One Package
Side 1 Output Is Compliant with Intel Mobile
VID Specifications (Includes 5-Bit DAC)
0.9V to 2.0V Output Voltage with 25mV/50mV Steps
Two Sides Run Out-of-Phase to Minimize C
IN
All N-Channel External MOSFET Architecture
No External Current Sense Resistor
Precision Internal 0.8V
鹵
1% Reference
550kHz Switching Frequency Minimizes External
Component Size
Very Fast Transient Response
Up to 25A Output Current per Channel
Low Shutdown Current: < 100碌A
Small 28-Pin SSOP Package
APPLICATIO S
s
s
s
s
Mobile Pentium
廬
III Processor Systems
Microprocessor Core and I/O Supplies
Multiple Logic Supply Generator
High Efficiency Power Conversion
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation. Pentium is a registered trademark
of Intel Corporation.
The LTC
廬
1703 is a dual switching regulator controller opti-
mized for high efficiency with low input voltages. It includes
two complete, on-chip, independent switching regulator
controllers. Each is designed to drive a pair of external
N-channel MOSFET devices in a voltage mode feedback,
synchronous buck configuration. The LTC1703 includes
digital output voltage adjustment on side 1 that conforms to
the Intel Mobile VID specification. It uses a constant-
frequency, true PWM design switching at 550kHz, minimiz-
ing external component size and cost and optimizing load
transient performance. The synchronous buck architecture
automatically shifts to discontinuous and then to Burst
Mode
TM
operation as the output load decreases, ensuring
maximum efficiency over a wide range of load currents.
The LTC1703 features an onboard reference trimmed to 1%
and delivers better than 1.5% regulation at the converter
outputs. An optional latching FAULT mode protects the load
if the output rises 15% above the intended voltage. Each
channel can be enabled independently; with both channels
disabled, the LTC1703 shuts down and supply current drops
below 100碌A.
TYPICAL APPLICATIO
V
OUT1
0.9V
TO 2V
15A
L1
1碌H
QT1
Dual Output Mobile Pentium III Processor Supply
DCP1
MBR0520LT1
1碌F
DCP2
MBR0520LT1
QT2
L2
2.2碌H
LTC1703
C
OUT1
180碌F
4V
脳
6
QB1A
1
2
QB1B
CCP1
1碌F
3
4
5
R
IMAX1
,18.7k 6
7
8
9
10
C21
C11
11
15pF
220pF
12
13
R31, 10k
14
VID0
VID1
VID2
VID3
VID4
PV
CC
I
MAX2
BOOST1
BOOST2
BG1
BG2
TG1
TG2
SW1
SW2
I
MAX1
PGND
FCB
FAULT
RUN/SS1 RUN/SS2
COMP1
COMP2
SGND
FB2
FB1
V
CC
VID4
SENSE
VID3
VID0
VID2
VID1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
CCP2
1碌F
+
QB2
R
IMAX2
20k
GND
C
SS1
0.22碌F
R21
100k
C31
220pF
R22, 100k
C22
15pF
1碌F
L1: MURATA LQT12535C1R5N12
L2: COILTRONICS UP2B-2R2
QT1, QB1A, QB1B: INTERNATIONAL RECTIFIER IRF7811
QT2, QB2: 1/2 FAIRCHILD NDS8926
U
V
IN
4.5V TO 5.5V
U
U
+
C
IN
150碌F
10V
脳
2
V
OUT2
1.5V
3A
+
C
OUT2
180碌F
4V
C32
2200pF
R12
10.2k
0.1%
R32
1k
10鈩?/div>
RB2
11.5k
0.1%
C12
220pF
GND
GND
1703 TA01
C
SS2
0.22碌F
1

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