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参数资料
| 型号： | LT1949IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/8页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1A 8SOIC |
| 标准包装： | 100 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.24 V ~ 30 V |
| 输入电压： | 1.7 V ~ 12 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 600kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
Final Electrical Specifications
LT1949-1
1.1MHz, 1A Switch
PWM DC/DC Converter
June 2000
DESCRIPTIO
FEATURES
The LT ? 1949-1 is a fixed frequency step-up DC/DC con-
verter with a 1A, 0.5 ? internal switch. Capable of gener-
s
s
s
s
s
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1A, 0.5 ? , 30V Internal Switch
1.1MHz Fixed Frequency Operation
Operates with V IN as Low as 1.5V
Low-Battery Detector Stays Active in Shutdown
Low V CESAT Switch: 410mV at 800mA
Pin-for-Pin Compatible with the LT1317B
Uses Ceramic Capacitors
Small 8-Lead MSOP Package
ating 10V at 175mA from a 3.3V input, the LT1949-1 is
ideal for generating bias voltages for large screen LCD
panels. Constant frequency 1.1MHz 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. The high switching frequency allows the use of
ceramic output capacitors. An external compensation pin
gives the user flexibility in optimizing loop compensation,
allowing small, low ESR ceramic capacitors to be used at
APPLICATIO S
the output. The 8-lead MSOP package ensures a low
profile overall solution.
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LCD Bias Supplies
GPS Receivers
Battery Backup
Portable Electronic Equipment
Diagnostic Medical Instrumentation
The LT1949-1 includes a low-battery detector that stays
alive when the device goes into shutdown. Quiescent
current in shutdown is 50 μ A, while operating current is
8mA.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
V IN
90
3.3V
L1
4.7 μ H
D1
80
V OUT = 10V
C1
3.3 μ F
CERAMIC
V IN
LT1949-1
SW
R1
196k
1%
V OUT
70
60
3.6V IN 4.2V IN 3V IN
SHUTDOWN
SHDN
FB
10V
V C
84.5k
50pF
GND
3pF
R2
28k
1%
175mA
C2
3.3 μ F
CERAMIC
50
40
30
20
C1, C2: TAIYO YUDEN LMK325BJ335MD
D1: MBRM120LT3
1949-1 F01
5
10
50 100
LOAD CURRENT (mA)
300
L1: SUMIDA CLQ4D10-4R7
Figure 1. 3.3V to 10V/175mA DC/DC Converter
1949-1 F02
Figure 2. 3.3V to 10V Converter Efficiency
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1
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