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LTC3731IG Datasheet

  • LTC3731IG

  • 3-Phase, 600kHz, Synchronous Buck Switching Regulator Contro...

  • 32頁

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FEATURES
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LTC3731
3-Phase, 600kHz,
Synchronous Buck Switching
Regulator Controller
DESCRIPTIO
The LTC
廬
3731 is a PolyPhase
廬
synchronous step-down
switching regulator controller that drives all N-channel ex-
ternal power MOSFET stages in a phase-lockable fixed fre-
quency architecture. The 3-phase controller drives its
output stages with 120擄 phase separation at frequencies of
up to 600kHz per phase to minimize the RMS current losses
in both the input and output filter capacitors. The 3-phase
technique effectively triples the fundamental frequency,
improving transient response while operating each control-
ler at an optimal frequency for efficiency and ease of ther-
mal design. Light load efficiency is optimized by using a
choice of output Stage Shedding or Burst Mode operation.
A differential amplifier provides true remote sensing of both
the high and low side of the output voltage at the point of
load. The precision reference supports output voltages from
0.6V to 6V.
Soft-start and a defeatable, timed short-circuit shutdown
protect the MOSFETs and the load. Current foldback
provides protection for the external MOSFETs under
short-circuit or overload conditions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode, OPTI-LOOP and PolyPhase are registered trademarks of Linear Technology
Corporation. Stage Shedding is a trademark of Linear Technology Corporation.
*Protected by U.S. Patents including 5481178, 5929620, 6177787, 6144194, 6100678,
5408150, 6580258, 6462525, 6304066, 5705919.
3-Phase Current Mode Controller with Onboard
MOSFET Drivers
鹵5%
Output Current Matching Optimizes Thermal
Performance and Size of Inductors and MOSFETs
Differential Amplifier Accurately Senses V
OUT
鹵1%
V
REF
Accuracy Over Temperature
Reduced Power Supply Induced Noise
鹵10%
Power Good Output Indicator
250kHz to 600kHz Per Phase, PLL, Fixed Frequency
PWM, Stage Shedding
TM
or Burst Mode
廬
Operation
OPTI-LOOP
廬
Compensation Minimizes C
OUT
Adjustable Soft-Start Current Ramping
Short-Circuit Shutdown Timer with Defeat Option
Overvoltage Soft Latch
Adjustable Undervoltage Lockout Threshold
Selectable Phase Output for Up to 12-Phase Operation
Available in 5mm
脳
5mm QFN and 36-Pin Narrow
(0.209") SSOP Packages
APPLICATIO S
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Desktop Computers and Servers
High Performance Notebook Computers
High Output Current DC/DC Power Supplies
TYPICAL APPLICATIO
V
CC
4.5V TO 7V
V
CC
10碌F
LTC3731
BOOST1
BOOST2
BOOST3
0.1碌F
SW3 SW2 SW1
TG1
SW1
BG1
SENSE1
+
SENSE1
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TG2
SW2
BG2
PGND
SENSE2
+
SENSE2
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TG3
SW3
BG3
SENSE3
+
SENSE3
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V
IN
V
IN
0.8碌H
0.003鈩?/div>
POWER GOOD INDICATOR
OPTIONAL SYNC IN
PGOOD
PLLIN
PLLFLTR
0.8碌H
0.003鈩?/div>
36k
V
IN
12k
680pF
I
TH
5k
0.01碌F
100pF
7.5k
6.04k
RUN/SS
SGND
EAIN
DIFFOUT
IN
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IN
+
UVADJ
0.8碌H
0.003鈩?/div>
Figure 1. High Current Triple Phase Step-Down Converter
3731fa
U
U
U
+
V
IN
5V TO 28V
22碌F
35V
V
OUT
1.35V
55A
+
C
OUT
470碌F
4V
3731 F01
1

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