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LTC1736C Datasheet

  • LTC1736C

  • Linear Technology [5-Bit Adjustable High Efficiency Synchro...

  • 325.34KB

  • LINER

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LTC1736
5-Bit Adjustable
High Efficiency Synchronous
Step-Down Switching Regulator
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
Dual N-Channel MOSFET Synchronous Drive
Synchronizable/Programmable Fixed Frequency
Wide V
IN
Range: 3.5V to 36V Operation
5-Bit Digital-to-Analog V
OUT
Selection:
0.925V to 2.00V Range with 50mV/25mV Steps
OPTI-LOOP
TM
Compensation Minimizes C
OUT
鹵
1% Output Voltage Accuracy
Power Good Output Voltage Monitor
Active Voltage Positioning Compatible
Output Overvoltage Crowbar Protection
Internal Current Foldback
Latched Short-Circuit Shutdown Timer
with Defeat Option
Forced Continuous Control Pin
Optional Programmable Soft-Start
Remote Output Voltage Sense
Available in 24-Lead SSOP Package
The LTC
廬
1736 is a synchronous step-down switching
regulator controller optimized for CPU power. The output
voltage is programmed by a 5-bit digital-to-analog con-
verter (DAC) that adjusts the output voltage from 0.925V
to 2.00V according to Intel mobile VID specifications. The
0.8V reference is compatible with future microprocessor
generations.
The operating frequency (synchronizable up to 500kHz) is
set by an external capacitor allowing maximum flexibility
in optimizing efficiency. The output voltage is monitored by
a power good window comparator that indicates when the
output is within 7.5% of its programmed value.
Protection features include: internal foldback current lim-
iting, output overvoltage crowbar and optional short-cir-
cuit shutdown. Soft-start is provided by an external capaci-
tor that can be used to properly sequence supplies. The
operating current level is user-programmable via an exter-
nal current sense resistor. Wide input supply range allows
operation from 3.5V to 30V (36V maximum).
Pin defeatable Burst Mode
TM
operation provides high effi-
ciency at low load currents. OPTI-LOOP compensation
allows the transient response to be optimized over a wide
range of output capacitance and ESR values.
APPLICATIO S
s
s
s
Notebook and Palmtop Computers, PDAs
Power Supply for Mobile Pentium
廬
II and
Pentium III Processors
Low Voltage Power Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
OPTI-LOOP and Burst Mode are trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
TYPICAL APPLICATIO
C
OSC
47pF
C
SS
0.1碌F
C
C1
330pF
V
IN
5V TO 24V
C
OSC
V
IN
TG
RUN/SS
SW
I
TH
PGOOD
VID4
VID3
VID2
VID1
VID0
SGND
LTC1736
VIDV
CC
INTV
CC
BOOST
BG
PGND
D
B
CMDSH-3
C
B
0.22碌F
M1
FDS6680A
C
IN
22碌F/50V
脳
2
CERAMIC
L1
1.2碌H
R
C
33k
C
C2
47pF
+
4.7碌F
M2
FDS6680A
脳
2
D1
MBRS340T3
V
OSENSE
SENSE
鈥?/div>
SENSE
+
1000pF
47pF
Figure 1. High Efficiency Step-Down Converter
U
R
SENSE
0.004鈩?/div>
V
OUT
1.35V TO 1.60V
12A
U
U
+
C
OUT
180碌F/4V
脳
4
C
OUT
: PANASONIC EEFUEOG181R
C
IN
: MARCON THCR70EIH226ZT
L1: PANASONIC ETQP6RZIR20HFA
R
SENSE
: IRC LRF2010-01-R004J
1736 F01
1

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