参数资料
型号: LT1946EMS8#TRPBF
厂商: Linear Technology
文件页数: 1/12页
文件大小: 0K
描述: IC REG BOOST 1.5A 8MSOP
标准包装: 2,500
类型: 升压(升压)
输出数: 1
输入电压: 2.45 V ~ 16 V
PWM 型: 电流模式
频率 - 开关: 2.7MHz
电流 - 输出: 1.5A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
包装: 带卷 (TR)
供应商设备封装: 8-MSOP
LT1946
1.2MHz Boost
DC/DC Converter with
1.5A Switch and Soft-Start
FEATURES
DESCRIPTIO
1.5A, 36V Internal Switch
1.2MHz Switching Frequency
Integrated Soft-Start Function
Output Voltage Up to 34V
Low V CESAT Switch: 300mV at 1.5A (Typ)
8V at 430mA from a 3.3V Input
Small 8-Lead MSOP Package
The LT ? 1946 is a fixed frequency step-up DC/DC converter
containing an internal 1.5A, 36V switch. Capable of gener-
ating 8V at 430mA from a 3.3V input, the LT1946 is ideal
for large TFT-LCD panel power supplies. The LT1946
switches at 1.2MHz, 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-
APPLICATIO S
mized transient response with low ESR ceramic output
capacitors. Soft-start is controlled with an external capaci-
TFT-LCD Bias Supplies
GPS Receivers
DSL Modems
Local Power Supplies
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 1.2mm high.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
Efficiency
V IN
3.3V
OFF ON
V IN
SHDN
4.7 μ H
SW
D1
28.7k
V OUT
8V
430mA
90
85
80
75
2.2 μ F
V C
LT1946
FB
20 μ F
70
49.9k
SS
COMP GND
65
5.23k
470pF
100nF
60
55
C1: 2.2 μ F, X5R OR X7R, 6.3V
C2: 2 × 10 μ F, X5R OR X7R, 10V
D1: MICROSEMI UPS120 OR EQUIVALENT
1946 F01
50
0
100
200
300
400
500
L1: TDK RLF5018T-4R7M1R4
LOAD CURRENT (mA)
1946 F01b
Figure 1. 3.3V to 8V, 430mA Step-Up DC/DC Converter
1946fb
1
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