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LT3641HFE#TRPBF

Description
Conv DC-DC 4V to 42V Synchronous Step Down Dual-Out 1.265V to 40.97V 1.3A/1.3A Automotive 28-Pin TSSOP EP T/R
File Size454KB，28 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LT3641HFE#TRPBF Overview

Conv DC-DC 4V to 42V Synchronous Step Down Dual-Out 1.265V to 40.97V 1.3A/1.3A Automotive 28-Pin TSSOP EP T/R

LT3641HFE#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)1.265 to 40.97
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
Minimum Input Voltage (V)4
Maximum Input Voltage (V)42
Operating Supply Voltage (V)4 to 42
Typical Quiescent Current (uA)275
Line Regulation0.001%/V(Typ)
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)150
Supplier Temperature GradeAutomotive
PackagingTape and Reel
Pin Count28
Standard Package NameSOP
Supplier PackageTSSOP EP
MountingSurface Mount
Package Height1.05(Max)
Package Length9.8(Max)
Package Width4.5(Max)
PCB changed28
Lead ShapeGull-wing

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FEATURES
n
LT3641
Dual Monolithic Buck
Regulator with Power-On
Reset and Watchdog Timer
DESCRIPTION
The LT
®
3641 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 42V and input transient protection 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 LT3641 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 42V Operating Range
1.3A Output Current
Input Transient Protection 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
Thermal Shutdown
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 5V/0.8A and 3.3V/0.5A Step Down Regulators
0.22μF
V
IN
7V TO 42V*
10μF
EN/UVLO V
IN
SW
SYNC
WDE
PGOOD2
V
OUT1
100k
100k
RST1
RST2
WDO
WDI
CWDT
CPOR
1.5nF
LT3641
V
IN2
EN2
SW2
226k
RT GND SS2
FB2
SS1
1nF
1nF
3641 TA01a
4.7μH
BST SW1
DA
FB1
301k
HV Channel Efficiency,
2MHz, V
OUT1
= 5V
V
OUT1
5V/0.8A
22μF
85
EFFICIENCY (%)
EFFICIENCY (%)
90
V
IN
= 12V
95
LV Channel Efficiency,
2MHz, V
OUT2
= 3.3V
90
V
IN2
= 5V
100k
85
80
μP
2.2μH
V
OUT2
3.3V/0.5A
22μF
80
75
75
49.9k
1.5nF
32.4k
70
0
0.2
0.4 0.6 0.8 1.0
V
OUT1
CURRENT (A)
1.2
1.4
70
0
0.2
0.4
0.6
0.8
V
OUT2
CURRENT (A)
1.0
1.2
3641 TA01b
3641 TA01c
* FOR INPUT VOLTAGES ABOVE 42V RESTRICTIONS APPLY
3641fa
1

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Description Conv DC-DC 4V to 42V Synchronous Step Down Dual-Out 1.265V to 40.97V 1.3A/1.3A Automotive 28-Pin TSSOP EP T/R Conv DC-DC 4V to 42V Synchronous Step Down Dual-Out 1.265V to 40.97V 1.3A/1.3A Automotive 28-Pin TSSOP EP Tube Conv DC-DC 4V to 42V Synchronous Step Down Dual-Out 1.265V to 40.97V 1.3A/1.3A Automotive 28-Pin TSSOP EP T/R Conv DC-DC 4V to 42V Synchronous Step Down Dual-Out 1.265V to 40.97V 1.3A/1.3A Automotive 28-Pin QFN EP Tube Conv DC-DC 4V to 42V Synchronous Step Down Dual-Out 1.265V to 40.97V 1.3A/1.3A Automotive 28-Pin QFN EP T/R Conv DC-DC 4V to 42V Synchronous Step Down Dual-Out 1.265V to 40.97V 1.3A/1.3A Automotive 28-Pin TSSOP EP Tube Conv DC-DC 4V to 42V Synchronous Step Down Dual-Out 1.265V to 40.97V 1.3A/1.3A Automotive 28-Pin TSSOP EP Tube Conv DC-DC 4V to 42V Synchronous Step Down Dual-Out 1.265V to 40.97V 1.3A/1.3A Automotive 28-Pin TSSOP EP T/R Conv DC-DC 4V to 42V Synchronous Step Down Dual-Out 1.265V to 40.97V 1.3A/1.3A Automotive 28-Pin QFN EP Tube Conv DC-DC 4V to 42V Synchronous Step Down Dual-Out 1.265V to 40.97V 1.3A/1.3A Automotive 28-Pin QFN EP T/R
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Compliant Compliant Compliant Compliant Compliant Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Active Active 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 Synchronous Step Down Synchronous Step Down
Output Type Adjustable Adjustable 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 350 to 2500 350 to 2500
Switching Regulator Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Number of Outputs 2 2 2 2 2 2 2 2 2 2
Output Voltage (V) 1.265 to 40.97 1.265 to 40.97 1.265 to 40.97 1.265 to 40.97 1.265 to 40.97 1.265 to 40.97 1.265 to 40.97 1.265 to 40.97 1.265 to 40.97 1.265 to 40.97
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|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 4 4
Maximum Input Voltage (V) 42 42 42 42 42 42 42 42 42 42
Operating Supply Voltage (V) 4 to 42 4 to 42 4 to 42 4 to 42 4 to 42 4 to 42 4 to 42 4 to 42 4 to 42 4 to 42
Typical Quiescent Current (uA) 275 275 275 275 275 275 275 275 275 275
Line Regulation 0.001%/V(Typ) 0.001%/V(Typ) 0.001%/V(Typ) 0.001%/V(Typ) 0.001%/V(Typ) 0.001%/V(Typ) 0.001%/V(Typ) 0.001%/V(Typ) 0.001%/V(Typ) 0.001%/V(Typ)
Minimum Operating Temperature (°C) -40 -40 -40 -40 -40 -40 -40 -40 -40 -40
Maximum Operating Temperature (°C) 150 125 125 125 125 150 125 125 125 125
Supplier Temperature Grade Automotive Extended Extended Extended Extended Automotive Industrial Industrial Industrial Industrial
Packaging Tape and Reel Tube Tape and Reel Tube Tape and Reel Tube Tube Tape and Reel Tube Tape and Reel
Pin Count 28 28 28 28 28 28 28 28 28 28
Standard Package Name SOP SOP SOP QFN QFN SOP SOP SOP QFN QFN
Supplier Package TSSOP EP TSSOP EP TSSOP EP QFN EP QFN EP TSSOP EP TSSOP EP TSSOP EP QFN EP QFN EP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 1.05(Max) 1.05(Max) 1.05(Max) 0.75(Max) 0.75(Max) 1.05(Max) 1.05(Max) 1.05(Max) 0.75(Max) 0.75(Max)
Package Length 9.8(Max) 9.8(Max) 9.8(Max) 5 5 9.8(Max) 9.8(Max) 9.8(Max) 5 5
Package Width 4.5(Max) 4.5(Max) 4.5(Max) 4 4 4.5(Max) 4.5(Max) 4.5(Max) 4 4
PCB changed 28 28 28 28 28 28 28 28 28 28
Lead Shape Gull-wing Gull-wing Gull-wing No Lead No Lead Gull-wing Gull-wing Gull-wing No Lead 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 8542.39.00.01 8542.39.00.01 - 8542.39.00.01

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Shortcut:   00 01 02 03 04 05 06 07 08 09 0A 0C 0F 0J 0L 0M 0R 0S 0T 0Z 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 1H 1K 1M 1N 1P 1S 1T 1V 1X 1Z 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 2G 2K 2M 2N 2P 2Q 2R 2S 2T 2W 2Z 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 3G 3H 3J 3K 3L 3M 3N 3P 3R 3S 3T 3V 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4M 4N 4P 4S 4T 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5E 5G 5H 5K 5M 5N 5P 5S 5T 5V 60 61 62 63 64 65 66 67 68 69 6A 6C 6E 6F 6M 6N 6P 6R 6S 6T 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7M 7N 7P 7Q 7V 7W 7X 80 81 82 83 84 85 86 87 88 89 8A 8D 8E 8L 8N 8P 8S 8T 8W 8Y 8Z 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9F 9G 9H 9L 9S 9T 9W

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