参数资料
型号: LTC3427EDC#TRPBF
厂商: Linear Technology
文件页数: 5/12页
文件大小: 0K
描述: IC REG BOOST SYNC ADJ 0.5A 6DFN
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: 1.8 V ~ 5.25 V
输入电压: 1.8 V ~ 5 V
PWM 型: 电流模式
频率 - 开关: 1.25MHz
电流 - 输出: 500mA
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: 6-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 6-DFN-EP(2x2)
LTC3427
PI FU CTIO S
SW (Pin 1): Switch Pin for the Inductor Connection.
Minimize trace length between SW and the inductor. For
discontinuous inductor current, an internal 200 ? imped-
FB (Pin 5): Feedback Input to the Error Amplifier. Connect
resistor divider tap to this pin. Referring to the Block
Diagram, V OUT can be adjusted from 1.8V to 5.25V by:
V OUT = 1 . 24 V ? ? 1 +
ance  is  connected  from  SW  to  V IN to  eliminate  high
frequency ringing, reducing EMI radiation.
GND (Pin 2): Signal and Power Ground. Provide a short,
?
?
R1 ?
R 2 ? ?
direct PCB path between GND and the (–) side of the input
and output capacitor(s).
V IN (Pin 3): Input Supply Voltage. Connect V IN to the input
supply and decouple with a 2.2 μ F or larger ceramic
capacitor as close to V IN as possible.
SHDN (Pin 4): Shutdown Input. Less than 350mV on
SHDN shuts down the LTC3427. Placing 1V or more on
SHDN enables the LTC3427.
BLOCK DIAGRA
V OUT (Pin 6): Output Voltage Sense Input and Drain of the
Internal Synchronous Rectifier MOSFET. Driver bias is
derived from V OUT . PCB trace length from V OUT to the
output filter capacitor(s) should be as short and wide as
possible.
Exposed Pad (Pin 7): Ground for the LTC3427. This pin
must be soldered to the PCB ground plane for electrical
connection and rated thermal performance.
V IN
L1
4.7 μ H
OPTIONAL
1.8V TO 5V
+
C IN
2.2 μ F
4
SHDN
3
V IN
1
SW
BULK CONTROL
SIGNALS
V IN
ANTIRING
SHUTDOWN
AND
SHDN
V OUT
6
V OUT
1.8V TO 5.25V
V BIAS
PWM
LOGIC
AND
DRIVERS
CURRENT
+
IZERO
COMP
SENSE
1.24V
PWM
COMP
REFERENCE
1V
I LIM
REF
Σ
+
+
THERMAL
SHUTDOWN
GAIN ERROR
AMPLIFIER
+
FB
1.24V
5
R1
R2
C OUT
4.7 μ F
SLOPE COMPENSATION
START-UP
SOFT-START
OSCILLATOR
7
EXPOSED PAD
GND
2
3427 BD
3427fa
5
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