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LT1683IG Datasheet

  • LT1683IG

  • Ultralow Noise Push-Pull DC/DC Controller

  • 24頁

  • LINER

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FEATURES
s
s
s
LT1683
Ultralow Noise
Push-Pull DC/DC Controller
DESCRIPTIO
The LT
廬
1683 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 external
N-channel MOSFET switches. Current and voltage slew
rates can be independently set to optimize harmonic
content of the switching waveforms vs efficiency. The
LT1683 can reduce high frequency harmonic power by as
much as 40dB with only minor losses in efficiency.
The LT1683 utilizes a dual output (push-pull) current
mode architecture optimized for low noise topologies. The
IC includes gate drivers and all necessary oscillator,
control and protection circuitry. Unique error amp cir-
cuitry can regulate both positive and negative voltages.
The oscillator may be synchronized to an external clock for
more accurate placement of switching harmonics.
Protection features include gate drive lockout for low V
IN
,
opposite gate lockout, soft-start, output current limit,
short-circuit current limiting, gate drive overvoltage clamp
and input supply undervoltage lockout.
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
Dual N-Channel MOSFET Drivers
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
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
51k
510鈩?/div>
0.5W
FZT853
1N4148
2N3904
8.2V
11V
23.2k
14
976鈩?/div>
1.2nF
7
16.9k
25k
25k
3.3k
3.3k
1.5k
0.22碌F 22nF
10nF
8
16
15
12
5
6
SHDN
V5
SYNC
C
T
LT1683
R
T
R
VSL
R
CSL
V
C
SS
13
GND
11
GATE B
CS
GATE A
CAP B
68碌F
20V
17
3
V
IN
GCL
CAP A
2
1
5pF
18
19
4 Si9422
10碌F
20V
Ultralow Noise 48V to 5V DC/DC Converter
48V
39碌F
63V
MIDCOM 31244
MBR0530
MBRS340
22碌H
150碌F
OS-CON
5pF
10pF
200V
MBRS340
10pF
200V
30pF
Si9422
0.1鈩?/div>
PGND
FB
NFB
10
1683 TA01
OPTIONAL
B
22碌H
2脳100碌F
POSCAP
A 5V/2A
A
200碌V/DIV
B
20mV/DIV
20
7.50k
9
5碌s/DIV
1683 TA01a
30pF
2.49k
U
U
U
5V Output Noise
(Bandwidth = 100MHz)
200碌V
P-P
1683f
1

LT1683IG 產(chǎn)品屬性

  • LT1683

  • 66

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 250kHz

  • 46%

  • 4 V ~ 20 V

  • 無

  • 是

  • 是

  • 是

  • 無

  • 無

  • 無

  • 無

  • -40°C ~ 125°C

  • 20-SSOP（0.209"，5.30mm 寬）

  • 管件

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