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LTC1705

Description
Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO
File Size317KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC1705 Overview

Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO

FEATURES
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LTC1705
Dual 550kHz Synchronous
Switching Regulator Controller with
5-Bit VID and 150mA LDO
DESCRIPTIO
The LTC
®
1705 is a complete power supply controller for
Intel Mobile Pentium processors. It includes two switch-
ing regulator controllers, each designed to drive a pair of
N-channel MOSFETs in a voltage mode feedback, syn-
chronous buck configuration, to provide the core and I/O
supplies. The core controller includes a 5-bit DAC that
conforms to the Intel Mobile VID specification. The IC also
includes a low dropout linear regulator (LDO) that delivers
up to 150mA of output current to provide the CLK supply.
The LTC1705 uses a constant-frequency 550kHz PWM
architecture, minimizing external component size and
cost, as well as optimizing load transient performance. It
provides better than 1.25% DC accuracy at its core output,
and 2% at I/0 and CLK outputs. The high performance
feedback loops allow the circuit to keep total output
regulation within
±5%
under all transient conditions. An
open-drain PGOOD flag indicates that all three outputs are
within
±10%
of their regulated values. A shutdown circuit
disables all three outputs if the RUN/SS pin is pulled to
ground. In this mode, the LTC1705 supply current drops
to below 100µA.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
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Three Regulated Outputs: Core, I/O and CLK in One
Package
Integrated Intel Mobile 5-Bit VID DAC
No External Current Sense Resistors
All N-Channel External MOSFET Architecture
550kHz Switching Frequency Minimizes External
Component Size and Cost
Integrated 150mA LDO Linear Regulator
Excellent DC Accuracy: 1.25% for Core, 2% for I/O
and CLK Supplies
PGOOD Flag Monitors All Three Outputs
High Efficiency Over Wide Load Current Range
Low Shutdown Current: < 100µA
Switchers Run Out-of-Phase to Minimize C
IN
Small 28-Pin Narrow SSOP Package
APPLICATIO S
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Complete Power Supply Controller for Intel
Mobile Pentium
®
Processors
Intel Mobile Pentium Core, I/O, Clock Supplies
Multiple Logic Supply Generator
TYPICAL APPLICATIO
V
IN
5V
C
IN
330µF
10V
×3
Intel Mobile Pentium VRM Supply
D
CPC
MBR
0520LT1
QTCB
R
PGOOD
5k
2
PV
CC
5
TGC
3
BOOSTC
6
4
R
IMAXC
, 27k
8
13
11
SWC
BGC
I
MAXC
SENSEC
FBC
COMPC
RUN/SS
PGND
GND
VID4:0
V
OUTCLK
23
C
VOUTCLK
10µF
10V
LTC1705
22
PGOOD
10Ω
19
10µF
D
CPIO
MBR
0520LT1
QTIO
C
CPIO
1µF
L
IO
3µH
C
OUTIO
QBIO 100µF
10V
×2
RB2
10k
1%
+
1µF
QTCA
L
C
0.68µH
V
OUTC
0.9V TO 2V
15A
C
CPC
1µF
QBCB
QBCA
V
CC
26
TGIO
27
BOOSTIO
SWIO
BGIO
I
MAXIO
COMPIO
FBIO
V
INCLK
25
28
1
21
20
24
1µF
+
C
OUTC
180µF
4V
×6
+
R
IMAXI0
, 16k
R22, 11k
C22
100pF
C11
R31
C31 1.8k 1800pF
1800pF
R21, 11k
10k
C
IN
: KEMET T510X337K010AS
C
OUTC
: PANASONIC EEFUE0G181R
C
OUTIO
: AVX TPS0107M010R0065
L
C
: SUMIDA CEP125-4712-T007
L
IO
: SUMIDA CDRH6D28-3R0
QTCA, QTCB, QBCA, QBCB: FAIRCHILD FDS6670A
QTIO, QBIO: 1/2 FAIRCHILD NDS8926
SHUTDOWN
C21
330pF
C
SS
0.1µF
10
9
7
12
14–18
+
C
VINCLK
10µF
10V
+
5-BIT VID
U
U
U
+
1µF
V
OUTIO
1.5V
3A
C12
2200pF
V
INCLK
3.3V
R12
8.87k
1%
1µF
V
OUTCLK
2.5V
150mA
1705 TA01
1

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