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LTC3731H_15

Description
3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller
File Size418KB,34 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet View All

LTC3731H_15 Overview

3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

FeaTures
n
n
LTC3731H
3-Phase, 600kHz,
Synchronous Buck Switching
Regulator Controller
DescripTion
The LTC
®
3731H is a PolyPhase
®
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 operation
up to 140°C junction temperature. The 3-phase controller
drives its output stages with 120° phase separation at
frequencies up to 680kHz 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
external MOSFETs under short-circuit or overload condi-
tions. Please refer to the LTC3731 data sheet for 0°C to
70°C and –40°C to 85°C rated versions.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, OPTI-LOOP and PolyPhase
are registered trademarks and Stage Shedding is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5481178, 5929620, 6177787, 6144194, 6100678, 5408150, 6580258, 6462525,
6304066, 5705919.
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3-Phase Current Mode Controller with Onboard
MOSFET Drivers
±5% Output Current Matching Optimizes Thermal
Performance and Size of Inductors and MOSFETs
±2% V
REF
Accuracy Over Temperature Up to 140°C
Reduced Power Supply Induced Noise
±10% Power Good Output Indicator
225kHz to 680kHz Per Phase, PLL, Fixed Frequency
PWM, Stage Shedding™ or Burst Mode
®
Operation
OPTI-LOOP
®
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 and
5mm
×
5mm QFN Packages
applicaTions
n
n
Automotive and Industrial Power Supplies
High Output Current DC/DC Power Supplies
Typical applicaTion
V
CC
4.5V TO 7V
V
CC
10µF
LTC3731H
TG1
SW1
BG1
SENSE1
+
SENSE1
TG2
SW2
BG2
PGND
UVADJ
680pF
I
TH
5k
0.01µF
100pF
RUN/SS
SGND
EAIN
SENSE2
+
SENSE2
TG3
SW3
BG3
SENSE3
+
SENSE3
0.8µH
0.003
+
V
IN
5V TO 28V
22µF
35V
100
90 V
FCB
= OPEN
80 V
FCB
= 5V
V
FCB
= 0V
70
60
50
40
30
0.1µF
SW3 SW2 SW1
POWER GOOD INDICATOR
OPTIONAL SYNC IN
36k
12k
BOOST1
BOOST2
BOOST3
Efficiency vs I
OUT
V
IN
0.8µH
EFFICIENCY (%)
0.003
V
OUT
1.35V
55A
PGOOD
PLLIN
PLLFLTR
V
IN
V
IN
0.8µH
0.003
20
10
0
0.1
1
10
V
IN
= 8V
V
OUT
= 1.5V
100
3731H F01b
7.5k
6.04k
LOAD CURRENT (A)
+
C
OUT
470µF
4V
3731H F01
Figure 1. High Current Triple Phase Step-Down Converter
3731Hfb

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