AE2359 查看數據表（PDF） - BaiDu Micro electrons Co., Ltd
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AE2359 Datasheet PDF : 11 Pages
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BAIDU MICRO ELECTRONS CO., LTD.
1.2A, 24V, 1.4MHz Step-down Converter
Pin Assignments
AE2359
PIN DESCRIPTION
Pin Name
Description
1
BST
2
GND
3
FB
4
EN
5
IN
6
SW
Bootstrap. To form a boost circuit, a capacitor is connected between SW and BST
pins to form a floating supply across the power switch driver. This capacitor is
needed to drive the power switch’s gate above the supply voltage. Typical values
for CBST range from 0.1uF to 1uF.
Ground. This pin is the voltage reference for the regulated output voltage. All
control circuits are referenced to this pin. For this reason care must be taken in its
layout.
Feedback. To set the output voltage, connect this pin to the output resistor divider
or directly to VOUT. To prevent current limit run away during a current limit
condition, the frequency feedback comparator lowers the oscillator frequency
when the FB voltage is below 400mV.
On/Off Control Input. Do not leave this pin floating. To turn the device ON, pull EN
above 1.2V and to turn it off pull below 0.4V.
If enable/disable is not used, connect a 100kOhm resistor between EN to VIN.
Supply Voltage. The AE2359 operates from a +4.75V to +24V unregulated input.
A decoupling capacitor C1 is required to prevent large voltage spikes from
appearing at the input. Place this capacitor near the IC.
Switch Output. This is the reference for the floating top gate driver.
2
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