Diodes AP3406A User Manual
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Data Sheet
General Description
The AP3406A is a 1.1MHz fixed frequency, current
mode, PWM synchronous buck (step-down) DC-DC
converter, capable of driving a 800mA load with high
efficiency, excellent line and load regulation. The
device integrates a main switch and a synchronous
switch without an external Schottky diode. 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 AP3406A. This feature greatly simplifies the
design of switch-mode power supplies.
This IC is available in TSOT-23-5, MSOP-10 and
DFN-2×2-6(1) packages.
Features
High Efficiency: up to 95%
•
• Output Current: 800mA
• Input Voltage Range: 2.5V to 5.5V
• Fixed 1.1MHz Frequency
• Current Mode Control
• 100% Duty Cycle in Dropout
• Built-in Short Circuit Protection
• Built-in Thermal Shutdown Function
• Built-in Current Limit Function
• Shutdown Current: <1µA
Applications
• GPS
• WiFi Card
• Portable Media Player
• Digital Still and Video Cameras
TSOT-23-5 MSOP-10 DFN-2×2-6(1)
Figure 1. Package Types of AP3406A
Feb. 2013 Rev. 1. 5 BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Pin Configuration
KT Package MM Package DN Package
TSOT-23-5 MSOP-10 DFN-2×2-6(1)
P in 1 Mark
EN
GND
1
2
5
SW
34
FB
VIN
VIN
NC
GND
NC
FB
1
2
3
4
5
10
Figure 2. Pin Configuration of AP3406A (Top View)
Pin Description
Pin Number
Pin Name Function
TSOT-23-5 MSOP-10 DFN-2×2-6(1)
1 8 2 EN
2 3 5 GND Ground pin
3 9 4 SW
4 1 3 VIN
5 5 6 FB
2, 4, 6, 7 1 NC No connection
PGND
9
SW
8
EN
NC
7
6
NC
NC
EN
VIN
1
2
3
6
FB
GND
5
4
SW
Control input pin. Forcing this pin above
1.5V enables the IC. Forcing this pin
below 0.6V shuts down the IC. When
the IC is in shutdown mode, all
functions are disabled to decrease the
supply current below 1µA
Power switch output pin. Inductor
connection to drain of the internal PFET
and NFET switches
Supply input pin. Bypass to GND with a
10µF or greater ceramic capacitor
Feedback pin. Connect it with an
external resistor divider network to
program the system output voltage
10 PGND Power ground pin
Feb. 2013 Rev. 1. 5 BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3406A
Ordering Information
AP3406A -
Circuit Type
Package
KT: TSOT-23-5
MM: MSOP-10
DN: DFN-2×2-6(1)
Package
TSOT-23-5
MSOP-10 AP3406AMM-ADJTRG1 3406AMM-G1 Tape & Reel
DFN-2×2-6(1) AP3406ADN-ADJTRG1 BA Tape & Reel
Temperature
Range
-40 to 85°C
Part Number Marking ID Packing Type
AP3406AKT-ADJTRG1 L2A Tape & Reel
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
ADJ: Adjustable Voltage
Feb. 2013 Rev. 1. 5 BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
Input Voltage VIN -0.3 to 6 V
Feedback Voltage VFB -0.3 to VIN +0.3 V
EN Pin Voltage VEN -0.3 to VIN+0.3 V
SW Pin Voltage VSW -0.3 to VIN+0.3 V
TSOT-23-5 250
Thermal Resistance
Operating Junction Temperature TJ 150 ºC
Storage Temperature T
Lead Temperature (Soldering, 10sec) T
θ
JA
-65 to 150 ºC
STG
260 ºC
LEAD
MSOP-10 135
DFN-2×2-6(1) 100
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 2.5 5.5 V
Maximum Output Current I
Operating Ambient Temperature TA -40 85 ºC
OUT (MAX)
800 mA
Feb. 2013 Rev. 1. 5 BCD Semiconductor Manufacturing Limited
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