参数资料
型号: LT3503EDCB#TRPBF
厂商: Linear Technology
文件页数: 7/20页
文件大小: 0K
描述: IC REG BUCK ADJ 1A 6DFN
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: 0.78 V ~ 16.2 V
输入电压: 3.6 V ~ 20 V
PWM 型: 电流模式
频率 - 开关: 2.2MHz
电流 - 输出: 1A
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(2x3)
LT3503
OPERATIO
(Refer to Block Diagram)
The LT3503 is a constant frequency, current mode step-
down regulator. A 2.2MHz oscillator enables an RS flip-
flop, turning on the internal 1.75A power switch Q1. An
amplifier and comparator monitor the current flowing
between the V IN and SW pins, turning the switch off when
this current reaches a level determined by the voltage at
V C . An error amplifier measures the output voltage through
an external resistor divider tied to the FB pin and servos the
V C node. If the error amplifier’s output increases, more
current is delivered to the output; if it decreases, less
current is delivered. An active clamp (not shown) on the V C
node provides current limit. The V C node is also clamped
to the voltage on the SHDN pin; soft-start is implemented
by generating a voltage ramp at the SHDN pin using an
external resistor and capacitor.
An internal regulator provides power to the control cir-
cuitry. This regulator includes an undervoltage lockout to
prevent switching when V IN is less than ~3.4V. The SHDN
pin is used to place the LT3503 in shutdown, disconnect-
ing the output and reducing the input current to less than
2 μ A.
The switch driver operates from either the input or from
the BOOST pin. An external capacitor and diode are used
to generate a voltage at the BOOST pin that is higher than
the input supply. This allows the driver to fully saturate the
internal bipolar NPN power switch for efficient operation.
The oscillator reduces the LT3503’s operating frequency
when the voltage at the FB pin is low. This frequency
foldback helps to control the output current during start-
up and overload.
3503f
7
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