AP3407A Datasheet PDF - BCD Semiconductor

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AP3407A
BCD Semiconductor

Part Number AP3407A
Description 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
Page 11 Pages


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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
General Description
The AP3407/A is a 1.4MHz fixed frequency, current
mode, PWM synchronous buck (step-down) DC-DC
converter, capable of driving a 1.2A load with high
efficiency, excellent line and load regulation. The
device integrates synchronous P-channel and
N-channel power MOSFET switches with low
on-resistance. It is ideal for powering portable
equipment that runs from a single Li-ion battery.
A standard series of inductors are available from
several different manufacturers optimized for use
with the AP3407/A. This feature greatly simplifies
the design of switch-mode power supplies.
The AP3407/A is available in SOT-23-5.
Features
Input Voltage Range: 2.5V to 5.5V
Output Voltage: 0.6V to VIN
• ADJ Output
• Fixed 1.4MHz Frequency
• High Efficiency up to 95%
• Output Current: 1.2A
Current Mode Control
100% Duty Cycle in Dropout
Built-in Over Current Protection
Built-in Short Circuit Protection
Built-in Thermal Shutdown Protection
• Built-in UVLO Function
Built-in Soft-start
Applications
• Datacom
• Portable Device
Smart Phone
Dec. 2011 Rev. 1. 3
SOT-23-5
Figure 1. Package Type of AP3407/A
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
Pin Configuration
K Package
(SOT-23-5)
EN 1
GND 2
SW 3
5 FB
4 VIN
VIN 1
GND 2
EN 3
5 SW
4 FB
(For AP3407)
(For AP3407A)
Figure 2. Pin Configuration of AP3407/A (Top View)
Pin Description
Pin Number
AP3407
AP3407A
13
22
35
41
54
Pin Name
EN
GND
SW
VIN
FB
Function
Control input pin. Forcing this pin above 1.5V enables
the IC. Forcing this pin below 0.4V shuts down the IC.
When the IC is in shutdown mode, all functions are
disabled to decrease the supply current below 1.2A
Ground pin
Power switch output pin. Inductor connection to drain
of the internal PFET and NFET switches
Supply input pin. Bypass to GND with a 4.7µF or
greater ceramic capacitor
This is the feedback pin of the device. Connect this pin
directly to the output if the fixed output voltage version
is used. For the adjustable version an external resistor
divider is connected to this pin.
Dec. 2011 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3407/A
Dec. 2011 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
Ordering Information
AP3407
Circuit Type
Blank: AP3407
A: AP3407A
-
G1: Green
TR: Tape & Reel
K: SOT-23-5
Package
SOT-23-5
Temperature
Range
-40 to 85 ºC
Part Number
Green
AP3407KTR-G1
AP3407AKTR-G1
Marking ID
Green
GJA
GJB
Packing Type
Tape & Reel
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Absolute Maximum Ratings (Note 1)
Parameter
Input Voltage
Feedback Voltage
EN Pin Voltage
SW Pin Voltage
Thermal Resistance
Thermal Resistance
Power Dissipation
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10sec)
Symbol
VIN
VFB
VEN
VSW
θJA
θJC
PD
TJ
TSTG
TLEAD
Value
-0.3 to 6.0
-0.3 to VIN +0.3
-0.3 to VIN+0.3
-0.3 to VIN+0.3
265
60
0.377
150
-65 to 150
260
Unit
V
V
V
V
ºC/W
ºC/W
W
ºC
ºC
ºC
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.
Note 2: The junction temperature rise is given by TRISING=PD*θJA, where PD is the power dissipated by regulator,
θJA is the thermal resistance from junction of the die to the ambient temperature; The junction temperature, TJ is
given by TJ=TA+TR, where TA is the ambient temperature.
Dec. 2011 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
4



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