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LT1946AEMS8E Datasheet

  • LT1946AEMS8E

  • 2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start

  • 12頁

  • LINER

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LT1946A
2.7MHz Boost DC/DC
Converter with 1.5A Switch
and Soft-Start
FEATURES
s
s
s
s
s
s
s
DESCRIPTIO
1.5A, 36V Internal Switch
2.7MHz Switching Frequency
Integrated Soft-Start Function
Adjustable Output from V
IN
to 35V
Low V
CESAT
Switch: 300mV at 1.5A (Typical)
12V at 430mA from a 5V Input
Small Thermally Enhanced 8-Lead MSOP Package
APPLICATIO S
s
s
s
s
TFT-LCD Bias Supplies
GPS Receivers
DSL Modems
Local Power Supply
The LT
廬
1946A is a fixed frequency step-up DC/DC con-
verter containing an internal 1.5A, 36V switch. Capable of
generating 12V at 430mA from a 5V input, the LT1946A is
ideal for powering large TFT-LCD panels. The LT1946A
switches at 2.7MHz, allowing the use of tiny, low profile
inductors and low value ceramic capacitors. Loop com-
pensation can be either internal or external, giving the user
flexibility in setting loop compensation and allowing opti-
mized transient response with low ESR ceramic output
capacitors. Soft-start is controlled with an external capaci-
tor which determines the input current ramp rate during
start up. The 8-lead MSOP package and high switching
frequency ensure a low profile overall solution less than
1.1mm high.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
V
IN
5V
3
1
L1
2.2碌H
6
V
IN
SHDN
V
C
SS
C
SS
100nF
8
OFF ON
C1
2.2碌F
R
C
27.4k
C
C
270pF
5
SW
D1
V
OUT
12V
430mA
R1
182k
EFFICIENCY (%)
90
85
80
2
LT1946A FB
7
COMP
GND*
4
R2
21k
C2
2.2碌F
75
70
65
60
C1: 2.2碌F, X5R or X7R, 6.3V
C2: 2.2碌F, X5R or X7R, 16V
D1: MICROSEMI UPS120 OR EQUIVALENT
L1: SUMIDA CR43-2R2
* EXPOSED PAD MUST ALSO BE GROUNDED
1946A TA01
55
50
0
100
200
300
400
LOAD CURRENT (mA)
500
1946A TA01
Figure 1. 5V to 12V, 430mA Step-Up DC/DC Converter
U
Efficiency
sn1946a 1946afs
U
U
1

LT1946AEMS8E 產品屬性

  • 50

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器

  • -

  • 升壓（升壓）

  • 可調式

  • 1

  • 1.25 V ~ 36 V

  • 2.45 V ~ 16 V

  • 電流模式

  • 2.7MHz

  • 1.5A

  • 無

  • -40°C ~ 85°C

  • 表面貼裝

  • 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）裸露焊盤

  • 管件

  • 8-MSOP-EP

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