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AP3211

BCD
Part Number AP3211
Manufacturer BCD
Description 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
Published Jul 30, 2015
Detailed Description Data Sheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 General Description The AP3211 is a 1.4MHz fixed freq...
Datasheet PDF File AP3211 PDF File

AP3211
AP3211

Overview
Data Sheet 1.
4MHz, 1.
5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 General Description The AP3211 is a 1.
4MHz fixed frequency, current mode, PWM buck (step-down) DC-DC converter, capable of driving a 1.
5A load with high efficiency, excellent line and load regulation.
The device integrates N-channel power MOSFET switch with low on-resistance.
Current mode control provides fast transient response and cycle-by-cycle current limit.
A standard series of inductors are available from several different manufacturers optimized for use with the AP3211.
This feature greatly simplifies the design of switch-mode power supplies.
The AP3211 is available in SOT-23-6 package.
Features • Input Voltage Range: 4.
5V to 18V • Output Voltage Adjustable from 0.
81V to 15V • Fixed 1.
4MHz Frequency • High Efficiency: up to 92% • Output Current: 1.
5A • Current Mode Control • Built-in Over Current Protection • Built-in Thermal Shutdown Function • Built-in UVLO Function • Built-in Over Voltage Protection • Built-in Soft-start Applications • LCD TV • DPF • Portable DVD SOT-23-6 Apr.
2013 Rev.
1.
4 Figure 1.
Package Type of AP3211 BCD Semiconductor Manufacturing Limited 1 Data Sheet 1.
4MHz, 1.
5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 Pin Configuration K Package (SOT-23-6) Pin 1 Mark BS 1 GND 2 FB 3 6 SW 5 IN 4 EN Figure 2.
Pin Configuration of AP3211 (Top View) Pin Description Pin Number Pin Name 1 BS 2 GND 3 FB 4 EN 5 IN 6 SW Function Bootstrap pin.
A bootstrap capacitor is connected between the BS pin and SW pin.
The voltage across the bootstrap capacitor drives the internal high-side NMOS switch Ground pin Feedback pin.
This pin is connected to an external resistor divider to program the system output voltage.
When VFB exceeds 20% of the nominal regulation value of 0.
81V, the OVP is triggered.
When VFB＜0.
25V, the oscillator frequency is lowered to realize short circuit protection Control input pin.
Forcing this pin above 1.
5V enables the IC.
Forcing this pin below 0.
4V shuts do...


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