AP3403

A Product Line of
Diodes Incorporated
AP3403
600mA STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
Description
Pin Assignments
NEW PRODUCT
The AP3403 is a 2.0MHz fixed frequency, current mode, PWM
synchronous buck (step-down) DC-DC converter, capable of driving a
600mA load with high efficiency, excellent line and load regulation.
The high efficiency is easily configured by using an inductor, resistors
and capacitors as the external components. Current mode control
provides fast transient response and cycle-by-cycle current limit.
(Top View)
Pin 1 Mark
The AP3403 employs complete protection to ensure system security,
including input Under Voltage Lock Out, Over Temperature Protection
and hiccup mode Short Circuit Protection.
This IC is available in U-DFN1616-6 package.
Features


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
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
High Efficiency Buck Power Converter
Input Voltage Range: 2.3V to 5.5V
Output Voltage Range: 0.7V to 5.5V
Fixed 2.0MHz Oscillator Frequency
Built-in Soft-start Time
Built-in Over Current Protection
Built-in Thermal Shutdown Function
Built-in UVLO Function
Hiccup Mode SCP
Output Current: 600mA
Package: U-DFN1616-6
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
EN
1
AGND
2
PGND
3
EP
6
FB
5
VIN
4
SW
U-DFN1616-6 (Type G)
Applications


Post DC-DC Voltage Regulation
PDA and Notebook Computer
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
L 2.2μH
VIN
5
SW
VIN
CIN
4.7μF
AP3403
1
ON/OFF
AP3403
Document number: DS36839 Rev. 3 - 2
EN
FB
AGND
PGND
VOUT 1.8V
4
6
2
R1
240KΩ
R2
120KΩ
Cff
22pF
COUT
10μF
3
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AP3403
NEW PRODUCT
Pin Descriptions
Pin Number
Pin Name
Function
1
EN
Control input pin. EN is a digital input that turns the regulator on or off. Drive EN high to turn the regulator
on. Drive low to turn the regulator off.
2
AGND
Signal Ground Pin
3
PGND
Power Ground Pin
4
SW
Power switch output pin. This pin is connected to the inductor.
5
VIN
Supply power input pin. A capacitor should be connected between VIN pin and GND - to keep the input
voltage constant.
6
FB
Feedback pin. This pin is connected to an external resistor divider to program the system output voltage.
Functional Block Diagram
EN
VIN
5
1
Slope
Compensation
OCP
Comparator
Oscillator
Current
Sensing
Shutdown
Comparator
Bias
Generator
Buffer &
Dead Time
Control
Logic
Control
Logic
Soft
Start
FB
UVLO
4
SW
PWM
Comparator
6
Reverse Inductor
Current Comparator
Error
Amplifier
Bandgap
Reference
AP3403
Document number: DS36839 Rev. 3 - 2
3
PGND
Vin OVP Comparator
2
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AGND
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© Diodes Incorporated
A Product Line of
Diodes Incorporated
AP3403
Absolute Maximum Ratings (Note 4)
NEW PRODUCT
Symbol
Note 4:
Parameter
Rating
Unit
-0.3 to 6.5
V
-0.3 to VIN + 0.3
V
VIN
VIN Input Voltage
VSW
SW Pin Voltage
VEN
EN Pin Input Voltage
-0.3 to 6.5
V
VFB
VFB Pin Voltage
-0.3 to 6.5
V
ISW
SW Pin Output Current
1
A
PD
Power Dissipation (Standard Land Pattern)
640
mW
-55 to +125
°C
2000
V
TSTG
Storage Temperature Range
VHBM
ESD (Human Body Model)
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 (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Min
Max
Unit
VIN
Input Voltage
2.3
5.5
V
TA
Operating Ambient Temperature
-40
+85
ºC
AP3403
Document number: DS36839 Rev. 3 - 2
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AP3403
Electrical Characteristics
(VIN = VEN = 3.6V (VOUT ≤ 2.6V), VIN = VEN = VOUT+1V (VOUT > 2.6V), unless otherwise specified.
Specification with standard typeface are for TA = +25ºC, and those in boldface type apply over the full operating temperature rang (TA = -40ºC to
+85ºC))
Symbol
NEW PRODUCT
VIN
Parameter
Input Voltage
Conditions
Min
Typ
Max
1.0V ≤ VOUT
2.3
–
5.5
0.9V ≤ VOUT < 1.0V
2.3
–
5.25
0.7V ≤ VOUT < 0.9V
2.3
–
4.5
Unit
V
Supply Current
VIN = VEN = VFB = 3.6V
–
32
45
µA
ISTDB
Standby Current
VIN = 5.5V, VEN = 0V
–
0
5
µA
VUVLO
Input UVLO Threshold
VIN Rising
2.0
2.1
2.2
V
VHYS
Input UVLO Hysteresis
–
–
0.1
–
V
VENH
EN Active Threshold Voltage
VIN = 5.5V
1.0
–
–
V
VENL
EN Shutdown Threshold Voltage
VIN = 2.3V
–
–
0.4
V
VFB
Feedback Voltage
VIN = VEN = 3.6V
0.591
0.600
0.609
V
IFBH
FB High Input Current
VIN = VFB = 5.5V
VEN = 0V
-1
0
1
µA
IFBL
FB Low Input Current
VEN = VFB = 0V
VIN = 5.5V
-1
0
1
µA
RONH
High-side Switch On-resistance
VIN = 3.6V
ISW = 100mA
–
380
–
mΩ
RONL
Low-side Switch On-resistance
VIN = 3.6V
ISW = 100mA
–
300
–
mΩ
ILIMH
SW Current Limit
VIN = VEN = 3.6V
800
1000
–
mA
fOSC
Oscillator Frequency
–
1.7
2.0
2.3
MHz
DMAX
Max. Duty Cycle
–
100
–
–
%
TOTSD
Thermal Shutdown
–
–
+140
–
ºC
THYS
Thermal Shutdown Hysteresis
–
–
+40
–
ºC
Soft-start Time
VIN = VEN = 3.6V
–
150
300
µs
IDD
tSS
AP3403
Document number: DS36839 Rev. 3 - 2
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AP3403
Performance Characteristics (TA = +25ºC, VIN = 3.6V, VOUT = 1.8V, unless otherwise specified.)
Efficiency vs. Output Current
Output Voltage vs. Output Current
1.815
100
90
1.810
80
1.805
Output Voltage (V)
Efficiency (%)
60
50
40
30
VOUT = 1.8V
1.800
1.795
1.790
VIN = 3.6V
1.785
20
1.780
10
0
-50
1.775
0
50
0
100 150 200 250 300 350 400 450 500 550 600 650
400
500
600
Feedback Voltage vs. Temperature
0.68
0.66
0.64
Feedback Voltage (V)
44
42
40
38
36
34
VOUT = 1.8V, IOUT = 0A
32
0.62
0.60
0.58
0.56
0.54
VIN = 3.6V, Test Mode
0.52
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0.50
6.0
-40
-20
0
20
Input Voltage (V)
40
60
80
100
120
140
o
Temperature ( C)
PMOS RDSON vs. Temperature
NMOS RDSON vs. Temperature
440
360
420
340
400
320
NMOS RDSON (m)
380
360
340
320
300
280
300
280
260
240
220
ISW = 100mA
ISW = 100mA
200
260
240
-60
300
Supply Current vs. Input Voltage
46
Supply Current (A)
200
Output Current (mA)
48
30
2.0
100
Output Current (mA)
50
PMOS RDSON (m)
NEW PRODUCT
70
-40
-20
0
20
40
60
80
100
120
140
Document number: DS36839 Rev. 3 - 2
-40
-20
0
20
40
60
80
100
120
140
O
O
Temperature ( C)
Temperature ( C)
AP3403
180
-60
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AP3403
Performance Characteristics (Cont. TA = +25ºC, VIN = 3.6V, VOUT = 1.8V, unless otherwise specified.)
Output Ripple (IOUT = 0A)
Output Ripple (IOUT = 0.6A)
VSW
2V/div
NEW PRODUCT
VSW
5V/div
VOUT-AC
20mV/div
VOUT-AC
20mV/div
IL
500mA/div
IL
500mA/div
Time 1µs/div
Time 1.6ms/div
Enable Turn on Characteristic
(Resistance Load, RLOAD = 3Ω)
Enable Turn off Characteristic
(Resistance Load, RLOAD = 3Ω)
VEN
2V/div
VEN
2V/div
VOUT
2V/div
VOUT
2V/div
VSW
1V/div
VSW
1V/div
Time 50µs/div
Time 50µs/div
Short Current Protection
(Resistance Load, RLOAD =3Ω)
VOUT
1V/div
SCP Recovery
(Resistance Load, RLOAD = 3Ω)
VOUT
1V/div
IL
500mA/div
IL
500mA/div
VSW
2V/div
VSW
2V/div
Time 200µs/div
Time 200µs/div
AP3403
Document number: DS36839 Rev. 3 - 2
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AP3403
Application Information
Please refer to the Typical Applications Circuit, and to set the circuit parameters please refer to the following descriptions.
NEW PRODUCT
Under Voltage Lockout (UVLO) Circuit
When the VIN drops lower than the UVLO detector threshold, the UVLO circuit starts to operate, V REF stops, and high-side switch and low-side
switch built-in switch transistors turn “OFF”. As a result, V OUT drops according to the COUT capacitance value and the load. When the VIN is rising
higher than UVLO released voltage, the IC will restart the operation.
Short Circuit Protection and Recovery
When the AP3403 output node is shorted to GND, as VFB drops under 0.3V, the chip will enter hiccup mode to protect itself, when short circuit is
removed, and VFB rises over 0.4V, the AP3403 recovers to normal operation again. If the AP3403 reaches OCP threshold while short circuit, the
AP3403 will enter cycle by cycle current limit mode until the current under OCP threshold.
Input Over Voltage Protection
When input voltage of AP3403 is near 6.25V, the IC will enter Input-Over-Voltage-Protection. It would be shut down and there will be no output
voltage in this state. As the input voltage goes down below 6V, it will leave input OVP and recover the output voltage.
Over Temperature Protection
The internal thermal temperature protection circuitry is provided to protect the integrated circuit in the event that the maximum junction
temperature is exceeded. When the junction temperature exceeds +140ºC, it shuts down the internal control circuit and switching power MOSFET.
The AP3403 will restart automatically under the control of soft start circuit when the junction temperature decreases to +100ºC.
Ordering Information
AP3403 FLJ - 7
Package
Packing
FLJ : U-DFN1616-6
7 : Tape & Reel
7” Tape and Reel
Part Number
Package Code
AP3403FLJ-7
Packaging
FLJ
U-DFN1616-6
Quantity
Part Number Suffix
3000/Tape & Reel
-7
Marking Information
U-DFN1616-6 (Type G)
(Top View)
XX
YWX
AP3403
Document number: DS36839 Rev. 3 - 2
XX : Identification Code
Y : Year : 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : Internal Code
Part Number
Package
Identification Code
AP3403FLJ-7
U-DFN1616-6
DE
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AP3403
Package Outline Dimensions (All dimensions in mm (inch).)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version.
(1)
Package Type: U-DFN1616-6 (Type G)
A
A3
A1
NEW PRODUCT
Seating Plane
U-DFN1616-6
(Type G)
Dim
Min
Max
Typ
A
0.50 0.60
0.56
A1
0.00
0.05
0.02
A3
--0.203
b
0.15
0.25
0.20
D
1.55
1.65
1.60
D2
1.20
1.40
1.30
e
--0.50
E
1.55
1.65
1.60
E2
0.60
0.80
0.70
k
--0.20
L
0.20
0.30
0.25
z
--0.20
All Dimensions in mm
D
D2
k
E
E2
(Pin #1 ID)
C0.1
L
e
b
Z
Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
(1)
Package Type: U-DFN1616-6 (Type G)
X2
C
Y
Dimensions
Y2
Y1
C
G
X
X1
X2
Y
Y1
Y2
G
X1
Value
(in mm)
0.500
0.150
0.300
1.300
1.300
0.450
0.700
1.900
X
AP3403
Document number: DS36839 Rev. 3 - 2
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AP3403
IMPORTANT NOTICE
NEW PRODUCT
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
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final and determinative format released by Diodes Incorporated.
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Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
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1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
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failure of the life support device or to affect its safety or effectiveness.
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representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2015, Diodes Incorporated
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AP3403
Document number: DS36839 Rev. 3 - 2
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