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LTC3731H Datasheet

  • LTC3731H

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

  • 323.27KB

  • 32頁

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FEATURES
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LTC3731H
3-Phase, 600kHz,
Synchronous Buck Switching
Regulator Controller
DESCRIPTIO
The LTC
廬
3731H is a PolyPhase
廬
synchronous step-down
switching regulator controller that drives all N-channel
external power MOSFET stages in a phase-lockable fixed
frequency architecture. The LTC3731H is rated for opera-
tion up to 140擄C junction temperature. The 3-phase con-
troller drives its output stages with 120擄 phase separation
at frequencies 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 controller at an optimal frequency for
efficiency and ease of thermal design. Light load efficiency
is optimized by using a choice of output Stage Shedding
or Burst Mode operation.
The precision reference supports output voltages from 0.6V
to 6V. Current foldback provides protection for the exter-
nal MOSFETs under short-circuit or overload conditions.
Please refer to the LTC3731 data sheet for 0擄C to 70擄C and
鈥?0擄C to 85擄C rated versions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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
鹵2%
V
REF
Accuracy Over Temperature up to 140擄C
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 36-Pin Narrow (0.209") SSOP Package
APPLICATIO S
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Automotive and Industrial Power Supplies
High Output Current DC/DC Power Supplies
TYPICAL APPLICATIO
V
CC
4.5V TO 7V
V
CC
10碌F
LTC3731H
BOOST1
BOOST2
BOOST3
0.1碌F
SW3 SW2 SW1
TG1
SW1
BG1
SENSE1
+
SENSE1
鈥?/div>
TG2
SW2
BG2
PGND
SENSE2
+
SENSE2
鈥?/div>
TG3
SW3
BG3
SENSE3
+
SENSE3
鈥?/div>
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
UVADJ
0.8碌H
0.003鈩?/div>
Figure 1. High Current Triple Phase Step-Down Converter
3731hf
U
U
U
+
V
IN
5V TO 28V
22碌F
35V
V
OUT
1.35V
55A
+
C
OUT
470碌F
4V
3731H F01
1

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