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LTC3709

Description
Fast 2-Phase, No RSENSE Synchronous DC/DC Controller with Tracking/Sequencing
File Size281KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC3709 Overview

Fast 2-Phase, No RSENSE Synchronous DC/DC Controller with Tracking/Sequencing

FEATURES
LTC3709
Fast 2-Phase, No R
SENSE
TM
,
Synchronous DC/DC Controller
with Tracking/Sequencing
DESCRIPTIO
The LTC
®
3709 is a single output, dual phase, synchronous
step-down switching regulator. The controller uses a
constant on-time, valley current control architecture to
deliver very low duty cycles without requiring a sense
resistor. Operating frequency is selected by an external
resistor and is compensated for variations in input supply
voltage. An internal phase-locked loop allows the LTC3709
to be synchronized to an external clock.
A TRACK pin is provided for tracking or sequencing the
output voltage among several LTC3709 chips or an
LTC3709 and other DC/DC regulators. Soft-start is ac-
complished using an external timing capacitor.
Fault protection is provided by an output overvoltage com-
parator and an optional short-circuit shutdown timer. The
current limit level is user programmable. A wide supply
range allows voltages as high as 31V to step down to 0.6V.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No RSENSE and PolyPhase are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6476589, 6144194, 5847554, 6177678,
6304066, 6580258, 6674274, 6462525, 6593724.
PolyPhase
TM
Valley Current Mode Controller
Synchronizable to an External Clock with PLL
Coincident or Ratiometric Tracking
Sense Resistor Optional
2% to 90% Duty Cycle at 200kHz
t
ON(MIN)
< 100ns
True Remote Sensing Differential Amplifier
High Efficiency at Both Light and Heavy Loads
Power Good Output Voltage Monitor
0.6V
±1%
Reference
Adjustable Current Limit
Programmable Soft-Start and Operating Frequency
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
32-Lead (5mm
×
5mm) QFN Package
APPLICATIO S
Notebook Computers
Power Supply for DSP, ASIC, Graphic Processors
TYPICAL APPLICATIO
5V
4.7µF
1µF
47.5k
V
CC
DRV
CC
I
ON
TRACK
TG1
V
RNG
FCB
BOOST1
100k
0.1µF
PGOOD
RUN/SS
3.32k
100nF
680pF
20k
SGND
10k
V
FB
DIFFOUT
15k
V
OS–
V
OS+
TG2
BOOST2
SW2
SENSE2
+
BG2
SENSE2
PGND2
SW1
SENSE1
+
10Ω
324k
High Efficiency Dual Phase 1.5V/30A Step-Down Converter
1µF
1µF
PGND1
PGND2
10µF
35V
×3
HAT2168H
0.22µF
1.22µH
100
95
90
V
IN
4.5V TO 28V
10k
EFFICIENCY (%)
BG1
HAT2165H
EXTLPF
SENSE1
INTLPF
PGND1
I
TH
LTC3709
HAT2168H
0.22µF
V
IN
1.22µH
V
OUT
1.5V
30A
HAT2165H
+
330µF
2.5V
×4
3709 TA01a
U
U
U
Efficiency and Power Loss
V
IN
= 12V
10
9
8
EFFICIENCY
7
6
5
4
3
POWER LOSS
2
1
0.1
1
10
LOAD CURRENT (A)
0
100
3709 TA01b
85
80
75
70
65
60
55
50
0.01
POWER LOSS (W)
3709f
1

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