Download Data Sheet Features General Description

Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
General Description
Features
The AP3417B 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 AP3417B. This feature greatly simplifies the
design of switch-mode power supplies.
AP3417B
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
Built-in Input Over Voltage Protection (IOVP)
The AP3417B is available in SOT-23-5 package.
Applications
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Set-top Box
Datacom
Portable Device
Smart Phone
SOT-23-5
Figure 1. Package Type of AP3417B
Jan. 2013
Rev. 1. 0
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
AP3417B
Pin Configuration
K Package
(SOT-23-5)
EN
1
GND
2
SW
3
5
FB
4
VIN
Figure 2. Pin Configuration of AP3417B (Top View)
Pin Description
Pin Number
Jan. 2013
Pin Name
Function
1
EN
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 1µA
2
GND
3
SW
4
VIN
5
FB
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
Rev. 1. 0
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
AP3417B
DRIVER
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3417B
Ordering Information
AP3417B
G1: Green
Circuit Type
TR: Tape & Reel
K: SOT-23-5
ADJ: Adjustable Output
Package
Temperature
Range
Part Number
SOT-23-5
-40 to 85ºC
AP3417BK-ADJTRG1
Marking
ID
G2J
Packing Type
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Jan. 2013
Rev. 1. 0
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
AP3417B
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
VSW
-0.3 to VIN+0.3
V
Thermal Resistance
θJA
265
ºC/W
Operating Junction Temperature
TJ
150
ºC
Storage Temperature
TSTG
-65 to 150
ºC
Lead Temperature (Soldering, 10sec)
TLEAD
260
ºC
ESD(Machine Model)
200
V
ESD(Human Body Model)
2000
V
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
Operating Ambient Temperature
TA
-40
85
ºC
Jan. 2013
Rev. 1. 0
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
AP3417B
Electrical Characteristics
VIN=5V, TA=25ºC, unless otherwise specified.
Parameters
Symbol
Input Voltage
VIN
Conditions
Min
Typ
2.5
Max
Unit
5.5
V
IQ
VFB=0.65V
62
100
µA
Shutdown Supply Current
ISTBY
VEN=GND
0.1
1
µA
Reference Voltage
VREF
0.6
0.612
V
Quiescent Current
0.588
IFB_H
VFB=1V
-0.1
0.1
IFB_L
VFB=0V
-0.1
0.1
Feedback Bias Current
µA
PMOSFET RON
RDS(ON)_ P
ISW=200mA
0.25
Ω
NMOSFET RON
RDS(ON) _N
ISW=-200mA
0.2
Ω
2.0
A
Switch Current Limit
ILIM
VFB=0.55V
1.5
1.5
VH
V
EN Pin Threshold
VL
0.4
UVLO Threshold
VUVLO
VIN Rising
2.3
UVLO Hysteresis
VHYS
Oscillator Frequency
fOSC
1.12
Max. Duty Cycle
DMAX
100
Min. Duty Cycle
DMIN
V
0.2
1.40
1.68
MHz
%
0
ISW_H
VSW=0V
0.1
ISW_L
VSW=5V
0.1
SW Leakage Current
Soft-start Time
µA
tSS
1
ms
Thermal Shutdown
TOTSD
160
ºC
Thermal
Hysteresis
THYS
20
ºC
6.3
V
0.5
V
Shutdown
Input OVP Threshold
VIOVP
Input OVP Hysteresis
VIOVP_HYS
Jan. 2013
VIN Rising
Rev. 1. 0
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
AP3417B
100
100
95
95
90
90
85
85
80
80
75
Efficiency (%)
Efficiency (%)
Typical Performance Characteristics
VIN=5.0V
VOUT=1.8V
70
75
70
65
65
60
60
55
55
50
0.0
VIN=5.0V
VOUT=1.8V
50
0.2
0.4
0.6
0.8
1.0
1.2
0.01
0.1
1
Output Current (A)
Output Current (A)
Figure 4. Efficiency vs. Output Current
Figure 5. Efficiency vs. Output Current
1.81
1.70
1.65
1.80
1.60
1.79
Frequency (MHz)
Output Voltage (V)
1.55
1.78
1.77
1.76
1.50
1.45
1.40
1.35
1.75
1.30
1.74
1.25
1.73
0
200
400
600
800
1000
1.20
2.5
1200
Output Current (mA)
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
Figure 7. Frequency vs. Input Voltage
Figure 6. Output Voltage vs. Output Current
Jan. 2013
3.0
Rev. 1. 0
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
AP3417B
Typical Performance Characteristics (Continued)
1.7
0.64
1.6
0.63
VIN=5.0V
0.62
Reference Voltage (V)
Frequency (MHz)
1.5
1.4
1.3
VIN=VEN=5.0V
1.2
1.1
0.61
0.60
0.59
0.58
0.57
1.0
-40
-20
0
20
40
60
80
100
120
0.56
-40
140
-20
0
20
o
0.40
2.3
0.38
2.2
0.36
100
120
140
0.34
2.1
PMOS RDS(ON)_UP (Ω)
Switch Current Limit (A)
80
Figure 9. Reference Voltage vs. Temperature
2.4
2.0
1.9
1.8
1.7
VIN=5.0V
1.6
0.32
0.30
0.28
0.26
0.24
0.22
1.5
VIN=5.0V
ISW=200mA
0.20
-20
0
20
40
60
80
100
120
0.18
-40
140
o
-20
0
20
40
60
80
100
120
140
o
Temperature ( C)
Temperature ( C)
Figure 11. RDS(ON)_UP vs. Temperature
Figure 10. Switch Current Limit vs. Temperature
Jan. 2013
60
Temperature ( C)
Figure 8. Frequency vs. Temperature
1.4
-40
40
o
Temperature ( C)
Rev. 1. 0
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
AP3417B
Typical Performance Characteristics (Continued)
0.32
NMOS RDS(ON)_DOWN (Ω)
0.28
VOUT_AC
5mV/div
0.24
VSW
5V/div
0.20
0.16
0.12
IL
100mA/div
VIN=5.0V
ISW=200mA
0.08
0.04
-40
-20
0
20
40
60
80
100
120
140
Time 4ms/div
o
Temperature ( C)
Figure 12. RDS(ON)_DOWN vs. Temperature
Figure 13. Output Ripple (IOUT=0A)
VOUT_AC
10mV/div
VOUT_AC
200mV/div
VSW
5V/div
VSW
5V/div
IL
1A/div
IOUT
1A/div
Time 400ns/div
Time 200µs/div
Figure 14. Output Ripple (IOUT=1.2A)
Jan. 2013
Figure 15. Load Transient (IOUT=0A to 1.2A)
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
AP3417B
Typical Performance Characteristics (Continued)
VEN
5V/div
VEN
5V/div
VSW
5V/div
VSW
5V/div
VOUT
1V/div
IL
1A/div
VOUT
1V/div
IL
1A/div
Time 400µs/div
Time 200µs/div
Figure 16. Enable Turn On (IOUT=1.2A)
Figure 17. Enable Turn Off (IOUT=1.2A)
VOUT
1V/div
VOUT
1V/div
VSW
5V/div
VSW
5V/div
IL
1A/div
IL
1A/div
Time 10ms/div
Time 10ms/div
Figure 18. Short Circuit Protection
(IOUT=1.2A)
Jan. 2013
Figure 19. Short Circuit Protection Recovery
(IOUT=1.2A)
Rev. 1. 0
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
AP3417B
Typical Performance Characteristics (Continued)
VIN
5V/div
VIN
5V/div
VSW
5V/div
VOUT
1V/div
VSW
5V/div
VOUT
1V/div
IL
1A/div
IL
1A/div
Time 20ms/div
Time 100ms/div
Figure 20. Over Voltage Protection
(IOUT=1.2A)
Jan. 2013
Figure 21. Over Voltage Protection Recovery
(IOUT=1.2A)
Rev. 1. 0
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
AP3417B
Typical Application
Figure 22. Typical Application of AP3417B
Jan. 2013
Rev. 1. 0
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Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
AP3417B
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)
Jan. 2013
Rev. 1. 0
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