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LT1738

Description
Slew Rate Controlled Ultralow Noise DC/DC Controller
File Size246KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Compare View All

LT1738 Overview

Slew Rate Controlled Ultralow Noise DC/DC Controller

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
4
×
150µF
OSCON
17
V
IN
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
10nF
GND
11
CS
4
25mΩ
PGND
FB
NFB
10
20
21.5k
9
GATE
1
Si9426
3
GCL
CAP
2
B
10µH
150µF
OSCON
OPTIONAL
5pF
A
+
+
12V
1A
+
100µF
POINT A
ON SCHEMATIC
500µV/DIV
POINT B
ON SCHEMATIC
50mV/DIV
22nF
0.22µF
1.5k
2.5k
1738 TA01
U
12V Output Noise
(Bandwidth = 100MHz)
400µV
P-P
5µs/DIV
1738 TA01a
U
U
1738fa
1

LT1738 Related Products

LT1738 LT1738EG LT1738IG
Description Slew Rate Controlled Ultralow Noise DC/DC Controller Slew Rate Controlled Ultralow Noise DC/DC Controller Slew Rate Controlled Ultralow Noise DC/DC Controller
Brand Name - Linear Technology Linear Technology
Is it Rohs certified? - incompatible incompatible
Maker - Linear ( ADI ) Linear ( ADI )
Parts packaging code - SSOP SSOP
package instruction - SSOP, SSOP20,.3 SSOP, SSOP20,.3
Contacts - 20 20
Manufacturer packaging code - G G
Reach Compliance Code - _compli _compli
ECCN code - EAR99 EAR99
Analog Integrated Circuits - Other Types - SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode - CURRENT-MODE CURRENT-MODE
Maximum input voltage - 20 V 20 V
Minimum input voltage - 2.55 V 2.55 V
Nominal input voltage - 12 V 12 V
JESD-30 code - R-PDSO-G20 R-PDSO-G20
JESD-609 code - e0 e0
length - 7.2 mm 7.2 mm
Humidity sensitivity level - 1 1
Number of functions - 1 1
Number of terminals - 20 20
Maximum operating temperature - 70 °C 125 °C
Maximum output current - 0.3 A 0.3 A
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - SSOP SSOP
Encapsulate equivalent code - SSOP20,.3 SSOP20,.3
Package shape - RECTANGULAR RECTANGULAR
Package form - SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius) - 235 235
Certification status - Not Qualified Not Qualified
Maximum seat height - 2 mm 2 mm
surface mount - YES YES
Switch configuration - SINGLE SINGLE
Maximum switching frequency - 250 kHz 250 kHz
Temperature level - COMMERCIAL AUTOMOTIVE
Terminal surface - Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form - GULL WING GULL WING
Terminal pitch - 0.65 mm 0.65 mm
Terminal location - DUAL DUAL
Maximum time at peak reflow temperature - 20 20
width - 5.3 mm 5.3 mm
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