参数资料
型号: LT3430IFE-1#PBF
厂商: Linear Technology
文件页数: 26/28页
文件大小: 0K
描述: IC REG BUCK ADJ 3A 16TSSOP
标准包装: 95
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: 管件
供应商设备封装: 16-TSSOP-EP
产品目录页面: 1331 (CN2011-ZH PDF)
LT3430/LT3430-1
APPLICATIONS INFORMATION
value equal to the peak-to-peak triangular waveform of the
inductor. The low output ripple design in Figure 15 places
the input capacitor between V IN and the regulated negative
output. This placement of the input capacitor signi?cantly
reduces the size required for the output capacitor (versus
placing the input capacitor between V IN and ground).
The peak-to-peak ripple current in both the inductor and
output capacitor (assuming continuous mode) is:
ESR of the chosen capacitor (see Output Ripple Voltage
in Applications Information).
Diode Current
Average diode current is equal to load current. Peak diode
current will be considerably higher.
Peak diode current:
Continuous Mode =
I P-P =
I COUT ( RMS ) =
I OUT IN OUT +
Discontinuous Mode =
DC ? V IN
f ? L
DC = Duty Cycle =
I P-P
12
V OUT + V F
V OUT + V IN + V F
( V + V ) ( V IN )( V OUT )
V IN 2 ( L )( f )( V IN + V OUT )
2 ( I OUT )( V OUT )
( L )( f )
Keep in mind that during start-up and output overloads,
average diode current may be much higher than with nor-
The output ripple voltage for this con?guration is as low
as the typical buck regulator based predominantly on the
inductor’s triangular peak-to-peak ripple current and the
mal loads. Care should be used if diodes rated less than
1A are used, especially if continuous overload conditions
must be tolerated.
TYPICAL APPLICATION
3.3V, 2A Buck Converter
MMSD914TI
6
V IN
5.5V*
TO 60V
4.7 μ F
100V
OFF ON
3, 4
15
V IN SW
BOOST
LT3430-1
SHDN BIAS
2, 5
10
1.5 μ F
30BQ060
68 μ H
+
V OUT
3.3V
2A
100 μ F 10V
SOLID
TANTALUM
14
SYNC
FB
12
20.5k
2 IN PARALLEL
GND
1, 8, 9, 16
V C
11
12.1k
220pF
3.3k
0.022 μ F
3430 F16
*FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY
34301fa
26
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