参数资料
型号: LT3430IFE-1#TRPBF
厂商: Linear Technology
文件页数: 1/28页
文件大小: 0K
描述: IC REG BUCK ADJ 3A 16TSSOP
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 1.2 V ~ 54 V
输入电压: 5.5 V ~ 60 V
PWM 型: 电流模式
频率 - 开关: 100kHz
电流 - 输出: 3A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm)裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 16-TSSOP-EP
LT3430/LT3430-1
High Voltage, 3A,
200kHz/100kHz Step-Down
Switching Regulators
FEATURES
DESCRIPTION
Wide Input Range: 5.5V to 60V
3A Peak Switch Current over All Duty Cycles
Constant Switching Frequency:
200kHz (LT3430)
100kHz (LT3430-1)
0.1 Ω Switch Resistance
Current Mode
Effective Supply Current: 2.5mA
Shutdown Current: 30μA
1.2V Feedback Reference Voltage
Easily Synchronizable
Cycle-by-Cycle Current Limiting
Small, 16-Pin Thermally Enhanced TSSOP Package
The LT ? 3430/LT3430-1 are monolithic buck switching
regulators that accept input voltages up to 60V. A high ef-
?ciency 3A, 0.1 Ω switch is included on the die along with
all the necessary oscillator, control and logic circuitry. A
current mode architecture provides fast transient response
and excellent loop stability.
Special design techniques and a new high voltage process
achieve high ef?ciency over a wide input range. Ef?ciency
is maintained over a wide output current range by using
the output to bias the circuitry and by utilizing a supply
boost capacitor to saturate the power switch. Patented
circuitry* maintains peak switch current over the full duty
cycle range. A shutdown pin reduces supply current to
APPLICATIONS
30μA and a SYNC pin can be externally synchronized with
a logic level input from 228kHz to 700kHz for the LT3430
Industrial and Automotive Power Supplies
Portable Computers
Battery Chargers
Distributed Power Systems
or from 125kHz to 250kHz for the LT3430-1.
The LT3430/LT3430-1 are available in a thermally enhanced
16-pin TSSOP package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
*US Patent # 6498466
TYPICAL APPLICATION
5V, 2A Buck Converter
Ef?ciency vs Load Current
MMSD914TI
100
V OUT = 5V
V IN = 12V
V IN
5.5V*
TO 60V
4.7 μ F
100V
OFF ON
V IN SW
BOOST
LT3430**
SHDN BIAS
0.68 μ F
30BQ060
22 μ H
+
V OUT
5V
2A
100 μ F 10V
SOLID
TANTALUM
90
80
70
V IN = 42V
15.4k
SYNC
FB
60
GND
V C
4.99k
50
0
0.5
1.0
LT3430-1 L = 68 μ H
LT3430 L =27 μ H
1.5 2.0 2.5
3.3k
220pF
LOAD CURRENT (A)
3430 TA02
0.022 μ F
3430 TA01
*FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY
** SEE LT3430-1 CIRCUIT IN APPLICATIONS INFORMATION SECTION
34301fa
1
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