Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
General Description
Features
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.
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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.
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
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Datacom
Portable Device
Smart Phone
SOT-23-5
Figure 1. Package Type of AP3407/A
Dec. 2011
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
1
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
4
FB
VIN
(For AP3407)
VIN
1
GND
2
EN
3
5
SW
4
FB
(For AP3407A)
Figure 2. Pin Configuration of AP3407/A (Top View)
Pin Description
Pin Number
Pin Name
AP3407
Function
AP3407A
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
1
3
EN
2
2
GND
3
5
SW
Power switch output pin. Inductor connection to drain
of the internal PFET and NFET switches
4
1
VIN
Supply input pin. Bypass to GND with a 4.7µF or
greater ceramic capacitor
FB
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.
5
Dec. 2011
4
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
2
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
3
Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
Ordering Information
AP3407
G1: Green
Circuit Type
TR: Tape & Reel
Blank: AP3407
A: AP3407A
K: SOT-23-5
Package
Temperature
Range
SOT-23-5
-40 to 85 ºC
Part Number
Marking ID
Green
Green
AP3407KTR-G1
AP3407AKTR-G1
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
Symbol
Value
Unit
Input Voltage
VIN
-0.3 to 6.0
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
Thermal Resistance
Thermal Resistance
Power Dissipation
Operating Junction Temperature
VSW
θJA
θJC
PD
TJ
-0.3 to VIN+0.3
265
60
0.377
150
V
ºC/W
ºC/W
W
ºC
Storage Temperature
TSTG
-65 to 150
ºC
Lead Temperature (Soldering, 10sec)
TLEAD
260
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
Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
Recommended Operating Conditions
Parameter
Symbol
Min
Max
Unit
Input Voltage
VIN
2.5
5.5
V
IOUT (MAX)
1.2
TA
-40
Maximum Output Current
Operating Ambient Temperature
A
85
ºC
Electrical Characteristics
VIN=VDD =VPVDD=3.3V, TA=25℃, unless otherwise specified.
Parameters
Symbol
Input Voltage
VIN
Quiescent Current
Shutdown Supply Current
Conditions
Typ
2.5
Max
Unit
5.5
V
IQ
VFB=0.65V
62
100
µA
ISTBY
VEN=GND
0.1
1
µA
0.6
0.612
V
-0.1
0.1
µA
-2
2
%
Reference Voltage
VREF
For Adjustable Output
Voltage
Feedback Bias Current
IFB
VFB=VIN
Output Voltage Accuracy
Min
∆VOUT
0.588
PMOSFET RON
RDS(ON)_ P
ISW = 200mA
0.28
Ω
NMOSFET RON
RDS(ON) _N
ISW = -200mA
0.25
Ω
2.0
A
Switch Current Limit
ILIM
VFB=0.55V
VH
1.5
1.5
EN Pin Threshold
V
VL
UVLO Threshold
VUVLO
UVLO Hysteresis
VHYS
Oscillator Frequency
fOSC
0.4
VDD Rising
2.3
V
0.2
1.12
Max. Duty Cycle
DMAX
VFB=0V
Min. Duty Cycle
DMIN
VFB=6.5V
1.40
1.68
MHz
100
%
N-MOS
Current
SW
Leakage
0
0.1
µA
t
1
ms
Thermal Shutdown
TOTSD
160
ºC
Thermal
Hysteresis
THYS
20
ºC
Soft-start Time
Dec. 2011
Shutdown
VIN=3.3V, VSW=3.3V
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
5
Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
Typical Performance Characteristics
100
95
96
90
80
Efficiency (%)
Efficiency (%)
85
75
70
65
60
88
80
VOUT=2.5V
55
50
VIN=3.3V
45
VOUT=2.5V
40
200
400
600
800
IOUT=0.5A
72
1000
IOUT=1.0A
2
1200
3
4
5
6
Input Voltage (V)
Output Current (mA)
Figure 5. Efficiency vs. Input Voltage
Figure 4. Efficiency vs. Output Current
1.8
2.51
2.50
Frequency (MHz)
Output Voltage (V)
1.7
2.49
2.48
VIN=3.3V
1.6
1.5
1.4
IOUT=300mA
VOUT=2.5V
2.47
1.3
200
400
600
800
1000
1200
2.5
Output Current (mA)
3.5
4.0
4.5
5.0
5.5
6.0
6.5
Input Voltage (V)
Figure 6. Output Voltage vs. Output Current
Dec. 2011
3.0
Figure 7. Frequency vs. Input Voltage
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
6
Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
Typical Performance Characteristics (Continued)
1.7
0.62
0.61
Feedback Voltage (V)
Frequency (MHz)
1.6
1.5
1.4
1.3
VIN=3.3V
0.60
0.59
0.58
VOUT=2.5V
VIN=3.3V
1.2
-40
0
40
80
120
0.57
160
-40
0
40
O
Temperature ( C)
120
160
Figure 9. Feedback Voltage vs. Temperature
2.2
0.5
2.0
0.4
1.8
0.3
RDS(ON)-UP (Ω)
OCP Current Limit (A)
Figure 8. Frequency vs. Temperature
1.6
1.4
80
O
Temperature ( C)
0.2
0.1
VIN=3.3V
VIN=3.3V
VFB=0.55V
ISW=200mA
1.2
0.0
-40
0
40
80
120
160
-40
O
40
80
120
160
Temperature ( C)
Figure 10. OCP Current Limit vs. Temperature
Dec. 2011
0
O
Temperature ( C)
Figure 11. RDS (ON)_UP vs. Temperature
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
7
Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
Typical Performance Characteristics (Continued)
0.32
RDS(ON)-Low (Ω)
0.28
0.24
0.20
0.16
VIN=3.3V
ISW=200mA
0.12
-40
0
40
80
120
160
O
Temperature ( C)
Figure 12. RDS (ON)_LOW vs. Temperature
Dec. 2011
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
8
Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
Typical Application
R2
VIN
EN
R1
FB
SW
AP3407/A-ADJ
CIN
VOUT
L
VIN
2.2 H
COUT
F
GND
F
Figure 13. Typical Application of AP3407/A
Dec. 2011
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
9
Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
Mechanical Dimensions
SOT-23-5
Unit: mm(inch)
2.820(0.111)
3.020(0.119)
0.100(0.004)
0.200(0.008)
0.200(0.008)
0.700(0.028)
REF
0.950(0.037)
TYP
0.300(0.012)
0.400(0.016)
0°
8°
1.800(0.071)
2.000(0.079)
0.000(0.000)
0.150(0.006)
0.900(0.035)
1.300(0.051)
Dec. 2011
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
10
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http://www.bcdsemi.com
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