LTC3892IUH-2#TRPBF datasheet, PDF

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LTC3892IUH-2#TRPBF: DescriptionDC/DC Cntrlr Dual-OUT Step Down 585kHz Automotive 32-Pin QFN EP T/R; File Size1MB，38 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LTC3892IUH-2#TRPBF Overview

DC/DC Cntrlr Dual-OUT Step Down 585kHz Automotive 32-Pin QFN EP T/R

LTC3892IUH-2#TRPBF Parametric

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
Number of Outputs	2
Topology	Step Down
Output Voltage (V)	0.8 to 59.4
Maximum Switching Frequency (kHz)	585
Minimum Input Voltage (V)	4.5
Maximum Input Voltage (V)	60
Operating Supply Voltage (V)	4.5 to 60
Typical Quiescent Current (mA)	0.029
Typical Gate Driver Pull Up Resistance (Ohm)	2.2
Typical Gate Driver Pull Down Resistance (Ohm)	1
Minimum Switching Frequency (kHz)	485
Typical Switching Frequency (kHz)	535
Synchronous Rectifier	Yes
Synchronous Clock	Yes
Programmability	Yes
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	125
Supplier Temperature Grade	Industrial
Packaging	Tape and Reel
Supplier Package	QFN EP
Pin Count	32
Standard Package Name	QFN
Mounting	Surface Mount
Package Height	0.75(Max)
Package Length	5
Package Width	5
PCB changed	32
Lead Shape	No Lead

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FEATURES

LTC3892/

LTC3892-1/LTC3892-2

60V Low I

, Dual, 2-Phase

Synchronous Step-Down

DC/DC Controller

DESCRIPTION

The

LTC

3892/LTC3892-1/LTC3892-2

is a high perfor-

mance dual step-down DC/DC switching regulator control-

ler that drives all N-channel synchronous power MOSFET

stages. Power loss and noise are minimized by operating

the two controller output stages out-of-phase.

The gate drive voltage can be programmed from 5V to

10V to allow the use of logic or standard-level FETs and

to maximize efficiency. Internal switches in the top gate

drivers eliminate the need for external bootstrap diodes.

A wide 4.5V to 60V input supply range encompasses a wide

range of intermediate bus voltages and battery chemistries.

Output voltages up to 99% of V

can be regulated. OPTI-

LOOP

compensation allows the transient response and

loop stability to be optimized over a wide range of output

capacitance and ESR values.

The 29μA no-load quiescent current extends operating run

time in battery powered systems. For a comparison of the

LTC3892 to the LTC3892-1 and LTC3892-2, see Table 1

in the Pin Functions section of this data sheet.

LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are

registered trademarks of Analog Devices, Inc. All other trademarks are the property of their

respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6144194,

6177787, 6580258.

Wide V

Range: 4.5V to 60V (65V Abs Max)

Wide Output Voltage Range: 0.8V ≤ V

OUT

≤ 99% • V

Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)

No External Bootstrap Diodes Required

Low Operating I

: 29μA (One Channel On)

Selectable Gate Drive UVLO Thresholds

Out-of-Phase Operation Reduces Required Input

Capacitance and Power Supply Induced Noise

Phase-Lockable Frequency: 75kHz to 850kHz

Selectable Continuous, Pulse Skipping or Low Ripple

Burst Mode

Operation at Light Loads

Selectable Current Limit (LTC3892/LTC3892-2)

Very Low Dropout Operation: 99% Duty Cycle

Power Good Output Voltage Monitors (LTC3892/LTC3892-2)

Low Shutdown I

: 3.6μA

Small 32-Lead 5mm

5mm QFN Package (LTC3892/

LTC3892-2) or TSSOP Package (LTC3892-1)

APPLICATIONS

Automotive and Industrial Power Systems

Distributed DC Power Systems

High Voltage Battery Operated Systems

TYPICAL APPLICATION

High Efficiency Dual 5V/12V Output Step-Down Converter

VIN

12.5V TO 60V

47µF

0.1µF

RUN1

TG1

BOOST1

SW1

BG1

LTC3892

1nF

SENSE1+

SENSE1–

FB1

ITH1

TRACK/SS1

VPRG1

7.5k

100pF

2.2nF

0.1µF

INTV

0.1µF

GND

SENSE2+

SENSE2–

FB2

ITH2

TRACK/SS2

DRVSET

DRVUV

DRV

4.7µF

3892 TA01

VIN

RUN2

TG2

BOOST2

SW2

BG2

0.1µF

15µH

OUT2

12V

EFFICIENCY (%)

150µF

100k

7.15k

34.8k

0.1µF

100pF

1nF

Efficiency vs Output Current

Efﬁciency vs Output Current

= 12V

OUT

= 5V

Burst Mode OPERATION

OUT1

220µF

5.6µH

1nF

GATE DRIVE

DRV

=5V

DRV

=6V

DRV

=8V

DRV

=10V

0.1

LOAD CURRENT (A)

3892 F01b

0.01

38921fc

For more information

www.linear.com/LTC3892

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