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Diodes Semiconductor Electronic Components Datasheet

AP3512E Datasheet

2A Synchronous DC-DC Buck Converter

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AP3512E pdf
Preliminary Datasheet
18V, 2A Synchronous DC-DC Buck Converter
AP3512E
General Description
The AP3512E is a 500kHz fixed frequency, current
mode, PWM synchronous buck (step-down) DC-DC
converter, capable of driving a 2A load with high
efficiency, excellent line and load regulation. The
AP3512E exhibits high efficiency at light load. 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.
The AP3512E employs complete protection to ensure
system security, including output Over Voltage
Protection, input Under Voltage Lock Out,
programmable Soft-start, Over Temperature
Protection and hiccup mode Short Circuit Protection.
This IC is available in SOIC-8 and PSOP-8 packages.
Features
• Input Voltage Range: 4.5V to 18V
• Fixed 500kHz Frequency
• High Efficiency at Light Load
• Output Current: 2A
• Current Mode Control
• Built-in Over Current Protection
• Built-in Thermal Shutdown Function
• Built-in UVLO Function
• Built-in Over Voltage Protection
• Programmable Soft-start
• Hiccup Mode SCP
Applications
• Monitor
• TV
• STB
• Datacom
SOIC-8
PSOP-8
Figure 1. Package Types of AP3512E
Dec. 2012 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
1


Diodes Semiconductor Electronic Components Datasheet

AP3512E Datasheet

2A Synchronous DC-DC Buck Converter

No Preview Available !

AP3512E pdf
Preliminary Datasheet
18V, 2A Synchronous DC-DC Buck Converter
AP3512E
Pin Configuration
M Package
(SOIC-8)
BS 1
IN 2
SW 3
GND 4
8 SS
7 EN
6 COMP
5 FB
MP Package
(PSOP-8)
BS 1
IN 2
SW 3
GND 4
EP
8 SS
7 EN
6 COMP
5 FB
Pin Description
Figure 2. Pin Configuration of AP3512E (Top View)
Pin Number
1
2
3
4
5
6
7
8
Pin Name
BS
IN
SW
GND
FB
COMP
EN
SS
EP
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.
Supply input pin. A capacitor should be connected between
the IN pin and GND pin to keep the DC input voltage
constant.
Power switch output pin. This pin is connected to the inductor
and bootstrap capacitor.
Ground pin
Feedback pin. This pin is connected to an external resistor
divider to program the system output voltage. When the FB
pin voltage exceeds 1.1V, the over voltage protection is
triggered. When the FB pin voltage is below 0.3V, the
oscillator frequency is lowered to realize short circuit
protection.
Compensation pin. This pin is the output of the
transconductance error amplifier and the input to the current
comparator. This pin is used to compensate the control loop.
Connect a series RC network from this pin to GND pin. In
some cases, an additional capacitor from this pin to GND pin
is required.
Enable Input. EN is a digital input that turns the regulator on
or off. Drive EN high to turn on the regulator, drive it low to
turn off. Pull up with 100kresistor for automatic startup.
Soft-start control input pin. SS controls the soft start period.
Connect a capacitor from SS to GND to set the soft-start
period. A 0.1µF capacitor sets the soft-start period to 15ms.
To disable the soft-start feature, leave SS unconnected.
Exposed pad. It should be connected to GND in PCB layout
Dec. 2012 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
2


Part Number AP3512E
Description 2A Synchronous DC-DC Buck Converter
Maker BCD
Total Page 13 Pages
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