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LT1738IG

Description
DC/DC Cntrlr Single-OUT Step Up 250kHz 20-Pin SSOP
File Size243KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Download user manual Parametric Compare View All

LT1738IG Overview

DC/DC Cntrlr Single-OUT Step Up 250kHz 20-Pin SSOP

LT1738IG Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesNot Compliant
ECCN (US)EAR99
Part StatusUnconfirmed
HTS8542.39.00.01
SVHCYes
SVHC Exceeds ThresholdYes
Number of Outputs1
TopologyStep Up
Output Voltage (V)5 to 100
Maximum Switching Frequency (kHz)250
Minimum Input Voltage (V)4
Maximum Input Voltage (V)20
Operating Supply Voltage (V)20(Max)
Maximum Supply Current (mA)55
Minimum Switching Frequency (kHz)20
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)125
Supplier Temperature GradeIndustrial
Pin Count20
Standard Package NameSOP
Supplier PackageSSOP
MountingSurface Mount
Package Height2(Max) - 0.05(Min)
Package Length7.5
Package Width5.6(Max)
PCB changed20
Lead ShapeGull-wing
LT1738
Slew Rate Controlled
Ultralow Noise DC/DC Controller
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
s
Greatly Reduced Conducted and Radiated EMI
Low Switching Harmonic Content
Independent Control of Output Switch Voltage and
Current Slew Rates
Greatly Reduced Need for External Filters
Single N-Channel MOSFET Driver
20kHz to 250kHz Oscillator Frequency
Easily Synchronized to External Clock
Regulates Positive and Negative Voltages
Easier Layout Than with Conventional Switchers
APPLICATIO S
s
s
s
s
s
s
Power Supplies for Noise Sensitive Communication
Equipment
EMI Compliant Offline Power Supplies
Precision Instrumentation Systems
Isolated Supplies for Industrial Automation
Medical Instruments
Data Acquisition Systems
The LT
®
1738 is a switching regulator controller designed
to lower conducted and radiated electromagnetic interfer-
ence (EMI). Ultralow noise and EMI are achieved by
controlling the voltage and current slew rates of an exter-
nal N-channel MOSFET switch. Current and voltage slew
rates can be independently set to optimize harmonic
content of the switching waveforms vs efficiency. The
LT1738 can reduce high frequency harmonic power by as
much as 40dB with only minor losses in efficiency.
The LT1738 utilizes a current mode architecture opti-
mized for single switch topologies such as boost, flyback
and Cuk. The IC includes gate drive and all necessary
oscillator, control and protection circuitry. Unique error
amp circuitry can regulate both positive and negative
voltages. The internal oscillator may be synchronized to
an external clock for more accurate placement of switch-
ing harmonics.
Protection features include gate drive lockout for low V
IN
,
soft-start, output current limit, short-circuit current limit-
ing, gate drive overvoltage clamp and input supply
undervoltage lockout.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5V
V
IN
P3
22µH
Ultralow Noise 5V to 12V Converter
MBRD620
B
10µH
150µF
OSCON
OPTIONAL
5pF
2
A
+
4
×
150µF
OSCON
17
V
IN
3
GCL
CAP
+
12V
1A
+
100µF
14
5
6
1.3nF
7
16.9k
25k
25k
3.3k
3.3k
8
16
15
12
SHDN
V5
SYNC
C
T
LT1738
R
T
R
VSL
R
CSL
V
C
SS
13
GND
11
POINT A
ON SCHEMATIC
500µV/DIV
GATE
1
Si9426
POINT B
ON SCHEMATIC
50mV/DIV
25mΩ
PGND
FB
NFB
10
20
21.5k
9
CS
4
22nF
0.22µF
1.5k
10nF
2.5k
1738 TA01
U
12V Output Noise
(Bandwidth = 100MHz)
400µV
P-P
5µs/DIV
1738 TA01a
U
U
1738fa
1

LT1738IG Related Products

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Description DC/DC Cntrlr Single-OUT Step Up 250kHz 20-Pin SSOP DC/DC Cntrlr Single-OUT Step Up 250kHz 20-Pin SSOP Tube DC/DC Cntrlr Single-OUT Step Up 250kHz 20-Pin SSOP T/R DC/DC Cntrlr Single-OUT Step Up 250kHz Automotive 20-Pin SSOP Tube DC/DC Cntrlr Single-OUT Step Up 250kHz Automotive 20-Pin SSOP T/R
EU restricts the use of certain hazardous substances Not Compliant Compliant Compliant Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Unconfirmed Active Active Active Active
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 Up Step Up Step Up Step Up Step Up
Output Voltage (V) 5 to 100 5 to 100 5 to 100 5 to 100 5 to 100
Maximum Switching Frequency (kHz) 250 250 250 250 250
Minimum Input Voltage (V) 4 4 4 4 4
Maximum Input Voltage (V) 20 20 20 20 20
Operating Supply Voltage (V) 20(Max) 20(Max) 20(Max) 20(Max) 20(Max)
Maximum Supply Current (mA) 55 55 55 55 55
Minimum Switching Frequency (kHz) 20 20 20 20 20
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 20 20 20 20 20
Standard Package Name SOP SOP SOP SOP SOP
Supplier Package SSOP SSOP SSOP SSOP SSOP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 2(Max) - 0.05(Min) 2(Max) - 0.05(Min) 2(Max) - 0.05(Min) 2(Max) - 0.05(Min) 2(Max) - 0.05(Min)
Package Length 7.5 7.5 7.5 7.5 7.5
Package Width 5.6(Max) 5.6(Max) 5.6(Max) 5.6(Max) 5.6(Max)
PCB changed 20 20 20 20 20
Lead Shape Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing
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