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LT1949IS8 Datasheet

  • LT1949IS8

  • 600kHz, 1A Switch PWM DC/DC Converter

  • 8頁

  • LINER

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LT1949
600kHz, 1A Switch
PWM DC/DC Converter
FEATURES
s
s
s
s
s
s
s
DESCRIPTIO
1A, 0.5鈩? 30V Internal Switch
Operates with V
IN
as Low as 1.5V
600kHz Fixed Frequency Operation
Low-Battery Detector Stays Active in Shutdown
Low V
CESAT
Switch: 410mV at 800mA
Pin-for-Pin Compatible with the LT1317B
Small 8-Lead MSOP and SO Packages
APPLICATIO S
s
s
s
s
s
LCD Bias Supplies
GPS Receivers
Battery Backup
Portable Electronic Equipment
Diagnostic Medical Instrumentation
The LT
廬
1949 is a fixed frequency step-up DC/DC con-
verter with a 1A, 0.5鈩?internal switch. Capable of gener-
ating 10V at 175mA from a 3.3V input, the LT1949 is ideal
for generating bias voltages for large screen LCD panels.
Constant frequency 600kHz operation results in a low
noise output that is easy to filter and the 30V switch rating
allows output voltage up to 28V using a single inductor. An
external compensation pin gives the user flexibility in
optimizing loop compensation, allowing small low ESR
ceramic capacitors to be used at the output. The 8-lead
MSOP and SO packages ensure a low profile overall
solution.
The LT1949 includes a low-battery detector that stays
alive when the device goes into shutdown. Quiescent
current in shutdown is 25碌A(chǔ), while operating current is
4.5mA.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
V
IN
3.3V
L1
10碌H
90
D1
80
SW
70
3.6V
IN
4.2V
IN
3V
IN
V
OUT
= 10V
+
C1
22碌F
V
IN
LT1949
SHUTDOWN
SHDN
V
C
68k
330pF
FB
GND
R2
140k
V
OUT
10V
175mA
C2
10碌F
CERAMIC
EFFICIENCY (%)
R1
1M
60
50
40
30
C1: AVX TAJA226M006R
C2: TAIYO YUDEN LMK325BJ106MN
D1: MBRM120LT3
L1: SUMIDA CDRH62B-100
1949 F01
20
5
10
50
100
LOAD CURRENT (mA)
300
1949 F02
Figure 1. 3.3V to 10V/175mA DC/DC Converter
Figure 2. 3.3V to 10V Converter Efficiency
U
U
U
1

LT1949IS8 產(chǎn)品屬性

  • LT1949

  • 100

  • 集成電路 (IC)

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

  • -

  • 升壓（升壓）

  • 可調(diào)式

  • 1

  • 1.24 V ~ 30 V

  • 1.7 V ~ 12 V

  • 電流模式

  • 600kHz

  • 1A

  • 無

  • -40°C ~ 85°C

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 管件

  • 8-SOIC

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