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LTC1705 Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC1705
Description  Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1705 Datasheet(HTML) 1 Page - Linear Technology

 
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LTC1705
1
DESCRIPTIO
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
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 100
µA.
s
Complete Power Supply Controller for Intel
Mobile Pentium
® Processors
s
Intel Mobile Pentium Core, I/O, Clock Supplies
s
Multiple Logic Supply Generator
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Three Regulated Outputs: Core, I/O and CLK in One
Package
s
Integrated Intel Mobile 5-Bit VID DAC
s
No External Current Sense Resistors
s
All N-Channel External MOSFET Architecture
s
550kHz Switching Frequency Minimizes External
Component Size and Cost
s
Integrated 150mA LDO Linear Regulator
s
Excellent DC Accuracy: 1.25% for Core, 2% for I/O
and CLK Supplies
s
PGOOD Flag Monitors All Three Outputs
s
High Efficiency Over Wide Load Current Range
s
Low Shutdown Current: < 100
µA
s
Switchers Run Out-of-Phase to Minimize CIN
s
Small 28-Pin Narrow SSOP Package
Dual 550kHz Synchronous
Switching Regulator Controller with
5-Bit VID and 150mA LDO
Pentium is a registered trademark of Intel Corporation.
Intel Mobile Pentium VRM Supply
SWC
BGC
IMAXC
6
4
8
SENSEC
13
RIMAXC, 27k
COUTC
180
µF
4V
×6
LC
0.68
µH
QBCA
QBIO
QBCB
PVCC
PGOOD
LTC1705
VID4:0
5-BIT VID
VCC
TGC
5
222
19
BOOSTC
3
+
COUTIO
100
µF
10V
×2
+
CIN
330
µF
10V
×3
1
µF
VIN
5V
VOUTC
0.9V TO 2V
15A
+
QTCB
QTIO
CCPC
1
µF
DCPC
MBR
0520LT1
QTCA
RIMAXI0, 16k
LIO
3
µH
VOUTIO
1.5V
3A
VOUTCLK
2.5V
150mA
FBC
11
R31
1.8k
R21, 11k
COMPC
10
RPGOOD
5k
CCPIO
1
µF
DCPIO
MBR
0520LT1
10
10
µF
C31
1800pF
1
µF
CVOUTCLK
10
µF
10V
CVINCLK
10
µF
10V
1
µF
1705 TA01
+
C11
1800pF
C21
330pF
C22
100pF
1
µF
C12
2200pF
RB2
10k
1%
RUN/SS
9
PGND
7
CSS
0.1
µF
10k
SHUTDOWN
CIN: KEMET T510X337K010AS
COUTC: PANASONIC EEFUE0G181R
COUTIO: AVX TPS0107M010R0065
LC: SUMIDA CEP125-4712-T007
LIO: SUMIDA CDRH6D28-3R0
QTCA, QTCB, QBCA, QBCB: FAIRCHILD FDS6670A
QTIO, QBIO: 1/2 FAIRCHILD NDS8926
VINCLK
3.3V
+
GND
12
14–18
SWIO
BGIO
IMAXIO
25
28
1
COMPIO
21
TGIO
26
BOOSTIO
27
FBIO
20
VINCLK
24
VOUTCLK
23
R22, 11k
R12
8.87k
1%


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