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LTC3732CUHF#PBF

Description
DC/DC Cntrlr Single-OUT Step Down 750kHz Automotive 38-Pin QFN EP Tube
File Size322KB,28 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC3732CUHF#PBF Overview

DC/DC Cntrlr Single-OUT Step Down 750kHz Automotive 38-Pin QFN EP Tube

LTC3732CUHF#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
Number of Outputs1
TopologyStep Down
Output Voltage (V)1.1 to 7
Maximum Switching Frequency (kHz)750
Minimum Input Voltage (V)4.5
Maximum Input Voltage (V)32
Operating Supply Voltage (V)4.5 to 7
Maximum Supply Current (mA)3.5
Minimum Operating Temperature (°C)0
Maximum Operating Temperature (°C)70
Supplier Temperature GradeCommercial
PackagingTube
Pin Count38
Standard Package NameQFN
Supplier PackageQFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length7
Package Width5
PCB changed38
Lead ShapeNo Lead
FEATURES
s
s
LTC3732
3-Phase, 5-Bit VID,
600kHz, Synchronous Buck
Switching Regulator Controller
DESCRIPTIO
The LTC
®
3732 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 3-phase controller drives its
output stages with 120° 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 fre-
quency, improving transient response while operating
each controller at an optimal frequency for high efficiency
and ease of thermal design. Light load efficiency is opti-
mized by using a choice of output Stage Shedding or Burst
Mode technology.
A differential amplifier provides true remote sensing of both
the high and low side of the output voltage at load points.
Soft-start and a defeatable, timed short-circuit shutdown
protect the MOSFETs and the load. A foldback current
circuit also 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
s
s
s
s
s
s
s
s
s
s
s
s
s
s
3-Phase Current Mode Controller with
Onboard MOSFET Drivers
±5%
Output Current Matching Optimizes Thermal
Performance and Size of Inductors and MOSFETs
4.5V
V
CC
7V; 4.5V
V
IN
32V
Differential Amplifier Accurately Senses V
OUT
Reduced Input and Output Capacitance
Reduced Power Supply Induced Noise
VID DAC Programmable from 1.1V to 1.85V
(VRM9.0/9.1)
±10%
Power Good Output Indicator
250kHz to 600kHz Per Phase, PLL, Fixed Frequency
PWM, Stage Shedding
TM
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
Small 36-Lead Narrow (0.209") SSOP Package
QFN 5mm
×
7mm 38-Lead Package
Desktop Computers
High Performance Notebook Computers
High Output Current DC/DC Power Supplies
APPLICATIO S
s
s
s
TYPICAL APPLICATIO
V
CC
4.5V TO 7V
V
CC
10µF
LTC3732
BOOST1
BOOST2
BOOST3
0.1µF
SW3 SW2 SW1
TG1
SW1
BG1
SENSE1
+
SENSE1
TG2
SW2
BG2
PGND
SENSE2
+
SENSE2
TG3
SW3
BG3
SENSE3
+
SENSE3
V
IN
V
IN
1µH
0.003Ω
POWER GOOD INDICATOR
OPTIONAL SYNC IN
PGOOD
PLLIN
PLLFLTR
1µH
0.003Ω
5 VID BITS
680pF
VID0-VID4
I
TH
5k
0.1µF
RUN/SS
SGND
EAIN
IN
IN
+
1µH
0.003Ω
100pF
Figure 1. High Current Triple Phase Step-Down Converter
3732f
U
U
U
+
V
IN
5V TO 28V
22µF
35V
V
OUT
1.1V TO 1.85V
55A
+
C
OUT
470µF
4V
3732 F01
1

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LTC3732CUHF#PBF LTC3732CG#PBF LTC3732CG#TRPBF LTC3732CG LTC3732CUHF#TRPBF
Description DC/DC Cntrlr Single-OUT Step Down 750kHz Automotive 38-Pin QFN EP Tube DC/DC Cntrlr Single-OUT Step Down 750kHz Automotive 36-Pin SSOP Tube DC/DC Cntrlr Single-OUT Step Down 750kHz Automotive 36-Pin SSOP T/R DC/DC Cntrlr Single-OUT Step Down 750kHz Automotive 36-Pin SSOP DC/DC Cntrlr Single-OUT Step Down 750kHz Automotive 38-Pin QFN EP T/R
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Not Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Active Active Active Unconfirmed Active
Number of Outputs 1 1 1 1 1
Topology Step Down Step Down Step Down Step Down Step Down
Output Voltage (V) 1.1 to 7 1.1 to 7 1.1 to 7 1.1 to 7 1.1 to 7
Maximum Switching Frequency (kHz) 750 750 750 750 750
Minimum Input Voltage (V) 4.5 4.5 4.5 4.5 4.5
Maximum Input Voltage (V) 32 32 32 32 32
Operating Supply Voltage (V) 4.5 to 7 4.5 to 7 4.5 to 7 4.5 to 7 4.5 to 7
Maximum Supply Current (mA) 3.5 3.5 3.5 3.5 3.5
Maximum Operating Temperature (°C) 70 70 70 70 70
Supplier Temperature Grade Commercial Commercial Commercial Commercial Commercial
Pin Count 38 36 36 36 38
Standard Package Name QFN SOP SOP SOP QFN
Supplier Package QFN EP SSOP SSOP SSOP QFN EP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 0.75(Max) 2(Max) - 0.05(Min) 2(Max) - 0.05(Min) 2(Max) - 0.05(Min) 0.75(Max)
Package Length 7 13.1(Max) 13.1(Max) 13.1(Max) 7
Package Width 5 5.6(Max) 5.6(Max) 5.6(Max) 5
PCB changed 38 36 36 36 38
Lead Shape No Lead Gull-wing Gull-wing Gull-wing No Lead
HTS 8542.39.00.01 8542.39.00.01 - - 8542.39.00.01
Packaging Tube Tube Tape and Reel - Tape and Reel
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