Diodes AP3201A User Manual
380kHz, 2A Asynchronous DC-DC Buck Converter AP3201A
Preliminary Datasheet
General Description
The AP3201A is a 380kHz fixed frequency, current
mode, PWM buck (step-down) DC-DC converter,
capable of driving a 2A 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 AP3201A. This feature greatly simplifies the
design of switch-mode power supplies.
This IC is available in HMSOP-10 package.
Features
• Input Voltage Range: 4.75V to 18V
• Fixed 380kHz Frequency
• High Efficiency: up to 93%
• 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
Applications
• LCD TV
• Set Top Box
• Portable DVD
• Digital Photo Frame
HMSOP-10
Figure 1. Package Type of AP3201A
Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter AP3201A
Pin Configuration
MH Package
(HMSOP-10)
1
2
3
4
5
10
9
8
7
6
Figure 2. Pin Configuration of AP3201A (Top View)
Pin Description
Pin Number Pin Name Function
1, 3
2
4
5
6
7
8
9
10
Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
NC No connection or tied to ground
Bootstrap pin. A bootstrap capacitor is connected between the BS pin
BS
and SW pin. The voltage across the bootstrap capacitor drives the
internal high-side power MOSFET
IN
SW
Supply input pin. A capacitor should be connected between the IN pin
and GND pin to keep the input voltage constant
Power switch output pin. This pin is connected to the inductor and
bootstrap capacitor
GND Ground pin
Feedback pin. This pin is connected to an exte rnal resistor divider to
program the system output voltage. When the FB pin voltage exceeds
FB
20% of the nominal regulation value of 0.920V, the over voltage
protection is triggered. When the FB pin voltage is below 0.6V, 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. It is used to
COMP
compensate the control loop. Connect a series RC network from this
pin to GND. In some cases, an additional capacitor from this pin to
GND pin is required
Control input pin. Forcing this pin above 1.5V or set this pin floating
EN
enables the IC. Forcing this pin below 0.5V shut s down the IC. When
the IC is in shutdown mode, all functions are disabled to decrease the
supply current below 1µA
Soft-start control input pin. SS controls the soft start period. Connect
SS
a capacitor from SS to GND to set the soft-start period. A 0.1µF
capacitor sets the soft-start period to 10ms. To disable the soft-start
feature, leave SS unconnected
2
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter AP3201A
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3201A
Ordering Information
AP3201A -
Circuit Type
Package
MH: HMSOP-10
Package
HMSOP-10 -40 to 85ºC AP3201AMHTR-G1 3201AMH-G1 Tape & Reel
Temperature
Range
Part Number Marking ID Packing Type
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
G1: Green
TR: Tape & Reel
Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter AP3201A
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
IN Pin Voltage VIN -0.3 to 20 V
EN Pin Voltage VEN -0.3 to VIN V
SW Pin Voltage VSW 20 V
BS Pin Voltage VBS -0.3 to VSW+6 V
FB Pin Voltage VFB -0.3 to 6 V
COMP Pin Voltage V
SS Pin Voltage VSS -0.3 to 6 V
Thermal Resistance
Operating Junction Temperature TJ 150 ºC
Storage Temperature T
Lead Temperature (Soldering, 10sec) T
ESD (Machine Model) 200 V
ESD (Human Body Model) 2000 V
-0.3 to 6 V
COMP
θ
JA
-65 to 150 ºC
STG
260 ºC
LEAD
60 ºC/W
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter Symbol Min Max Unit
Input Voltage VIN 4.75 18 V
Maximum Output Current I
Operating Ambient Temperature TA -40 85 ºC
OUT (Max)
2 A
Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
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