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LT1738IG Datasheet

  • LT1738IG

  • Slew Rate Controlled Ultralow Noise DC/DC Controller

  • 20頁(yè)

  • LINER

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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
廬
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
22碌H
Ultralow Noise 5V to 12V Converter
MBRD620
B
10碌H
150碌F
OSCON
OPTIONAL
5pF
2
A
+
4
脳
150碌F
OSCON
17
V
IN
3
GCL
CAP
+
12V
1A
+
100碌F
14
5
6
1.3nF
7
16.9k
25k
25k
3.3k
3.3k
8
16
15
12
POINT A
ON SCHEMATIC
500碌V/DIV
SHDN
V5
SYNC
C
T
LT1738
R
T
R
VSL
R
CSL
V
C
SS
13
GND
11
GATE
1
Si9426
CS
4
25m鈩?/div>
POINT B
ON SCHEMATIC
50mV/DIV
22nF
PGND
FB
NFB
10
20
21.5k
9
0.22碌F
1.5k
10nF
2.5k
1738 TA01
U
12V Output Noise
(Bandwidth = 100MHz)
400碌V
P-P
5碌s/DIV
1738 TA01a
U
U
1738fa
1

LT1738IG 產(chǎn)品屬性

  • LT1738

  • 66

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 250kHz

  • 93.5%

  • 2.55 V ~ 20 V

  • 無(wú)

  • 是

  • 是

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 是

  • 無(wú)

  • -40°C ~ 125°C

  • 20-SSOP（0.209"，5.30mm 寬）

  • 管件

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