参数资料
型号: LTC3421EUF#TRPBF
厂商: Linear Technology
文件页数: 10/16页
文件大小: 0K
描述: IC REG BOOST SYNC ADJ 1.5A 24QFN
标准包装: 2,500
类型: 升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 2.4 V ~ 5.25 V
输入电压: 0.5 V ~ 4.5 V
PWM 型: 电流模式,混合
频率 - 开关: 100kHz ~ 3MHz
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: 24-WFQFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 24-QFN 裸露焊盘(4x4)
LTC3421
OPERATIO
Simplified Diagram of Automatic Burst Mode Control Circuit
V CC
1mA
I OUT /3000
UV
V REF
–4%
+
SSDONE
SSDONE
FB 1
ERROR AMP/
SLEEP COMP
0.9V/
1.1V
9 BURST
R B
C B
+
MODE
1 = Burst Mode
OPERATION
0 = PWM MODE
V REF
± 1%
TO
MODULATOR
SLEEP
3421 TA03
CLAMP
0.5V TO 1V
24 V C
R COMP
C COMP
The circuit connected to BURST should be able to sink or
source up to 2mA. Note that Burst Mode operaton is
inhibited during start-up and soft-start.
Note that if V IN is above V OUT – 0.3V, the part will exit Burst
I O ( MAX ) =
2 ?
0 . 55
1 + ( V OUT – V IN )
V IN
in amps
Mode operation and the synchronous rectifier will be
disabled.
Note that if the load applied during forced Burst Mode
operation exceeds the current that can be supplied, the
output voltage will start to droop and the part will auto-
matically come out of Burst Mode operation and enter fixed
frequency mode, raising V OUT . The maximum current that
can be supplied in Burst Mode operation is given by:
OUTPUT DISCONNECT AND INRUSH LIMITING
The LTC3421 is designed to allow true output disconnect
by eliminating body diode conduction of the internal
P-channel MOSFET rectifier. This allows V OUT to go to zero
volts during shutdown without drawing any current from
the input source. It also allows for inrush current limiting
at turn-on, minimizing surge currents seen by the input
supply. Note that to obtain the advantages of output
3421f
10
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