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LT3640IUFD#TRPBF

Description
Conv DC-DC 4V to 36V Synchronous Step Down Dual-Out 35.12V 1.3A/1.3A Automotive 28-Pin QFN EP T/R
File Size492KB，24 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LT3640IUFD#TRPBF Overview

Conv DC-DC 4V to 36V Synchronous Step Down Dual-Out 35.12V 1.3A/1.3A Automotive 28-Pin QFN EP T/R

LT3640IUFD#TRPBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
TypeSynchronous Step Down
Output TypeAdjustable
Switching Frequency (kHz)350 to 2500
Switching RegulatorYes
Number of Outputs2
Output Voltage (V)35.12(Max)
Maximum Output Current (A)1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3
Minimum Input Voltage (V)4
Typical Input Voltage (V)12
Maximum Input Voltage (V)36
Operating Supply Voltage (V)12
Typical Quiescent Current (uA)275
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)125
Supplier Temperature GradeIndustrial
PackagingTape and Reel
Pin Count28
Standard Package NameQFN
Supplier PackageQFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length5
Package Width4
PCB changed28
Lead ShapeNo Lead

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FeaTures
n
LT3640
Dual Monolithic Buck
Regulator with Power-On
Reset and Watchdog Timer
DescripTion
The LT
®
3640 is a dual channel, current mode monolithic
buck switching regulator with a power-on reset and a
watchdog timer. Both regulators are synchronized to a
single oscillator with an adjustable frequency (350kHz to
2.5MHz). At light loads, both regulators operate in low
ripple Burst Mode
®
to maintain high efficiency and low
output ripple.
The high voltage channel is a nonsynchronous buck with
an internal 2.4A top switch that operates from an input
of 4V to 35V; a 36.5V OVLO protects the device to 55V.
The low voltage channel operates from an input of 2.5V to
5.5V. Internal synchronous power switches provide high
efficiency without the need of external Schottky diode.
Both channels have cycle-by-cycle current limit, providing
protection against shorted outputs.
The power-on reset and watchdog timeout periods are
both adjustable using external capacitors. The window
mode watchdog timer flags when the µP pulses group
too close together or too far apart.
The LT3640 is available in a 28-pin 4mm
×
5mm QFN
package and 28-pin TSSOP package. Both packages have
an exposed pad for low thermal resistance.
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High Voltage Buck Regulator:
4V to 35V Operating Range
1.3A Output Current
OVLO Protects Input to 55V
Low Voltage Synchronous Buck Regulator:
2.5V to 5.5V Input Voltage Range
1.1A Output Current
Synchronizable, Adjustable 350kHz to 2.5MHz
Switching Frequency
Programmable Power-On Reset Timer
Programmable Window Mode Watchdog Timer
Typical Quiescent Current: 290µA
Short-Circuit Robust
Programmable Soft-Start
Low Shutdown Current: I
Q
< 1µA
Available in Thermally Enhanced 28-Lead
(4mm
×
5mm) QFN and 28-Lead TSSOP Packages
applicaTions
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Industrial Power Supplies
Automotive Electronic Control Units
L,
LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical applicaTion
2MHz 3.3V/0.8A and 1.8V/0.8A Step Down Regulators
0.22µF
V
IN
5V TO 35V
10µF
EN/UVLO V
IN
SW
SYNC
WDE
PGOOD
V
OUT1
100k
100k
RST1
RST2
WDO
WDI
CWDT
CPOR
1.5nF
LT3640
V
IN2
EN2
SW2
FB2
SS1
1nF
1nF
3640 TA01a
HV Channel Efficiency,
2MHz, V
OUT1
= 3.3V
90
90
LV Channel Efficiency,
2MHz, V
OUT2
= 1.8V
V
IN2
= 3.3V
3.3µH
BST SW1
DA
FB1
80.6k
49.9k
V
OUT1
3.3V/0.8A
22µF
EFFICIENCY (%)
85
V
IN
= 12V
EFFICIENCY (%)
0
0.2
0.4
0.6
0.8
1.0
V
OUT1
CURRENT (A)
1.2
3640 TA01b
85
80
80
µP
1µH
100k
V
OUT2
1.8V/0.8A
22µF
75
75
RT GND SS2
1.5nF
32.4k
49.9k
70
70
0
0.2
0.4
0.6
V
OUT2
CURRENT (A)
0.8
3640 TA01c
1
3640f


LT3640IUFD#TRPBF Related Products

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Description Conv DC-DC 4V to 36V Synchronous Step Down Dual-Out 35.12V 1.3A/1.3A Automotive 28-Pin QFN EP T/R Conv DC-DC 4V to 36V Synchronous Step Down Dual-Out 35.12V 1.3A/1.3A Automotive 28-Pin QFN EP Tube Conv DC-DC 4V to 36V Synchronous Step Down Dual-Out 35.12V 1.3A/1.3A Automotive 28-Pin TSSOP EP Tube Conv DC-DC 4V to 36V Synchronous Step Down Dual-Out 35.12V 1.3A/1.3A Automotive 28-Pin TSSOP EP T/R Conv DC-DC 4V to 36V Synchronous Step Down Dual-Out 35.12V 1.3A/1.3A Automotive 28-Pin QFN EP T/R Conv DC-DC 4V to 36V Synchronous Step Down Dual-Out 35.12V 1.3A/1.3A Automotive 28-Pin TSSOP EP Tube Conv DC-DC 4V to 36V Synchronous Step Down Dual-Out 35.12V 1.3A/1.3A Automotive 28-Pin TSSOP EP T/R Conv DC-DC 4V to 36V Synchronous Step Down Dual-Out 35.12V 1.3A/1.3A Automotive 28-Pin QFN EP Tube
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Compliant Compliant Compliant Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Active Active Active Active Active Active Active Active
Type Synchronous Step Down Synchronous Step Down Synchronous Step Down Synchronous Step Down Synchronous Step Down Synchronous Step Down Synchronous Step Down Synchronous Step Down
Output Type Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable
Switching Frequency (kHz) 350 to 2500 350 to 2500 350 to 2500 350 to 2500 350 to 2500 350 to 2500 350 to 2500 350 to 2500
Switching Regulator Yes Yes Yes Yes Yes Yes Yes Yes
Number of Outputs 2 2 2 2 2 2 2 2
Output Voltage (V) 35.12(Max) 35.12(Max) 35.12(Max) 35.12(Max) 35.12(Max) 35.12(Max) 35.12(Max) 35.12(Max)
Maximum Output Current (A) 1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3 1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3 1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3 1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3 1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3 1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3 1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3 1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3|1.3
Minimum Input Voltage (V) 4 4 4 4 4 4 4 4
Typical Input Voltage (V) 12 12 12 12 12 12 12 12
Maximum Input Voltage (V) 36 36 36 36 36 36 36 36
Operating Supply Voltage (V) 12 12 12 12 12 12 12 12
Typical Quiescent Current (uA) 275 275 275 275 275 275 275 275
Minimum Operating Temperature (°C) -40 -40 -40 -40 -40 -40 -40 -40
Maximum Operating Temperature (°C) 125 125 125 125 125 125 125 125
Supplier Temperature Grade Industrial Extended Extended Extended Extended Industrial Industrial Industrial
Packaging Tape and Reel Tube Tube Tape and Reel Tape and Reel Tube Tape and Reel Tube
Pin Count 28 28 28 28 28 28 28 28
Standard Package Name QFN QFN SOP SOP QFN SOP SOP QFN
Supplier Package QFN EP QFN EP TSSOP EP TSSOP EP QFN EP TSSOP EP TSSOP EP QFN EP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 0.75(Max) 0.75(Max) 1.05(Max) 1.05(Max) 0.75(Max) 1.05(Max) 1.05(Max) 0.75(Max)
Package Length 5 5 9.8(Max) 9.8(Max) 5 9.8(Max) 9.8(Max) 5
Package Width 4 4 4.5(Max) 4.5(Max) 4 4.5(Max) 4.5(Max) 4
PCB changed 28 28 28 28 28 28 28 28
Lead Shape No Lead No Lead Gull-wing Gull-wing No Lead Gull-wing Gull-wing No Lead
HTS 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 - 8542.39.00.01 8542.39.00.01 -

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