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LT3844IFE#PBF

Description
DC/DC Cntrlr Single-OUT Step Down 600kHz Automotive 16-Pin TSSOP EP Tube
File Size260KB,26 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LT3844IFE#PBF Overview

DC/DC Cntrlr Single-OUT Step Down 600kHz Automotive 16-Pin TSSOP EP Tube

LT3844IFE#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)1.231 to 36
Maximum Switching Frequency (kHz)600
Minimum Input Voltage (V)4
Maximum Input Voltage (V)60
Operating Supply Voltage (V)4 to 60
Maximum Supply Current (mA)2.1
Typical Quiescent Current (mA)0.12
Minimum Switching Frequency (kHz)100
Synchronous RectifierNo
Synchronous ClockYes
Control MethodPWM
ProgrammabilityYes
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)125
Supplier Temperature GradeIndustrial
PackagingTube
Pin Count16
Standard Package NameSOP
Supplier PackageTSSOP EP
MountingSurface Mount
Package Height0.95(Max)
Package Length5.1(Max)
Package Width4.5(Max)
PCB changed16
Lead ShapeGull-wing
LT3844
High Voltage, Current Mode
Switching Regulator Controller with
Programmable Operating Frequency
FeaTures
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DescripTion
The
LT
®
3844
is a DC/DC controller used for medium power,
low part count, high efficiency supplies. It offers a wide
4V to 60V input range (7.5V minimum start-up voltage)
and can implement step-down, step-up, inverting and
SEPIC topologies.
The LT3844 includes Burst Mode operation, which reduces
quiescent current below 120µA and maintains high effi-
ciency at light loads. An internal high voltage bias regulator
allows for simple biasing.
Additional features include current mode control for fast
line and load transient response; programmable fixed
operating frequency that can be synchronized to an ex-
ternal clock for noise sensitive applications; a gate driver
capable of driving large N-channel MOSFETs; a precision
undervoltage lockout function; 10µA shutdown current;
short-circuit protection and a programmable soft-start
function.
The LT3844 is available in a 16-lead thermally enhanced
TSSOP package.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5731694, 6498466, 6611131
n
n
n
n
n
n
n
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High Voltage Operation: Up to 60V
Output Voltages Up to 36V (Step Down)
Programmable Constant Frequency: 100kHz to
500kHz
Synchronizable up to 600kHz
Burst Mode
®
Operation: 120µA Supply Current
10µA Shutdown Supply Current
±1.3% Reference Accuracy
Drives N-Channel MOSFET
Programmable Soft-Start
Programmable Undervoltage Lockout
Internal High Voltage Regulator for Gate Drive
Thermal Shutdown
Current Limit Unaffected by Duty Cycle
16-Pin Thermally Enhanced TSSOP Package
applicaTions
n
n
n
n
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Industrial Power Distribution
12V and 42V Automotive and Heavy Equipment
High Voltage Single Board Systems
Distributed Power Systems
Avionics
Telecom Power
Typical applicaTion
High Voltage Step-Down Regulator 48V to 12V, 50W
V
IN
36V TO 60V
Efficiency and Power Loss
vs Load Current
90
88
V
IN
= 48V
7
6
EFFICIENCY
5
4
LOSS
3
2
1
0
10
3844 TA01b
68µF
22µF
1M
1000pF
V
IN
SHDN
C
SS
BURST_EN
V
FB
V
C
SYNC
f
SET
0.22µF
BOOST
TG
SW
V
CC
PGND
SENSE
+
SENSE
SGND
10
Si7850DP
EFFICIENCY (%)
82.5k
86
84
82
80
78
76
0.1
POWER LOSS (W)
LT3844
1µF
10µH
PDS5100H
0.015
68µF
V
OUT
12V
50W
33µF
14.7k
10k
680p
120pF
130k
R7
49.9k
1
LOAD CURRENT (A)
3844 TA01
3844fc
For more information
www.linear.com/LT3844
1

LT3844IFE#PBF Related Products

LT3844IFE#PBF LT3844EFE#PBF LT3844EFE#TRPBF LT3844IFE#TRPBF LT3844IFE
Description DC/DC Cntrlr Single-OUT Step Down 600kHz Automotive 16-Pin TSSOP EP Tube DC/DC Cntrlr Single-OUT Step Down 600kHz Automotive 16-Pin TSSOP EP Tube DC/DC Cntrlr Single-OUT Step Down 600kHz Automotive 16-Pin TSSOP EP T/R DC/DC Cntrlr Single-OUT Step Down 600kHz Automotive 16-Pin TSSOP EP T/R DC/DC Cntrlr Single-OUT Step Down 600kHz Automotive 16-Pin TSSOP EP
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Compliant Not Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Active Active Active Active Unconfirmed
HTS 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01
Number of Outputs 1 1 1 1 1
Topology Step Down Step Down Step Down Step Down Step Down
Output Voltage (V) 1.231 to 36 1.231 to 36 1.231 to 36 1.231 to 36 1.231 to 36
Maximum Switching Frequency (kHz) 600 600 600 600 600
Minimum Input Voltage (V) 4 4 4 4 4
Maximum Input Voltage (V) 60 60 60 60 60
Operating Supply Voltage (V) 4 to 60 4 to 60 4 to 60 4 to 60 4 to 60
Maximum Supply Current (mA) 2.1 2.1 2.1 2.1 2.1
Typical Quiescent Current (mA) 0.12 0.12 0.12 0.12 0.12
Minimum Switching Frequency (kHz) 100 100 100 100 100
Synchronous Rectifier No No No No No
Synchronous Clock Yes Yes Yes Yes Yes
Control Method PWM PWM PWM PWM PWM
Programmability Yes Yes Yes Yes Yes
Minimum Operating Temperature (°C) -40 -40 -40 -40 -40
Maximum Operating Temperature (°C) 125 125 125 125 125
Supplier Temperature Grade Industrial Extended Extended Industrial Industrial
Pin Count 16 16 16 16 16
Standard Package Name SOP SOP SOP SOP SOP
Supplier Package TSSOP EP TSSOP EP TSSOP EP TSSOP EP TSSOP EP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 0.95(Max) 0.95(Max) 0.95(Max) 0.95(Max) 0.95(Max)
Package Length 5.1(Max) 5.1(Max) 5.1(Max) 5.1(Max) 5.1(Max)
Package Width 4.5(Max) 4.5(Max) 4.5(Max) 4.5(Max) 4.5(Max)
PCB changed 16 16 16 16 16
Lead Shape Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing
Packaging Tube Tube Tape and Reel Tape and Reel -
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