AP3403 User Guide

AP3403
EVB User Guide
CONFIDENTIAL INFORMATION
1. General Description
The AP3403 is a 2.0 MHz 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.
The AP3403 employs complete protection to ensure system security. Including input
Under Voltage Lock Out, programmable Soft Start, Over Temperature Protection and
hiccup mode Short Circuit Protection.
This IC is available in U-DFN1616-6 package.
2. Key Features
• Input Voltage Range :2.3V to 5.5V (Absolute maximum rating: 6.5V)
• Output Voltage Range: 0.7V to 5.5V(Note: As for 1.0V or less, input voltage range is
limited.)
• Feedback Voltage Accuracy : ±9mV (VFB=0.6V)
• Temperature-Drift Coefficient of Feedback Voltage: Typ. ±100ppm/°C
• Oscillator Frequency : Typ. 2.0MHz
• Maximum Duty Cycle : 100%
• Built-in Driver ON Resistance :Typ. Pch. 0.38Ω, Nch. 0.3Ω (VIN=3.6V)
• Supply Current (at no load):Typ. 34μA
• Standby Current :Max. 5μA
• UVLO Detector Threshold:Typ. 2.0V
• Soft-start Time: Typ. 150μs
• LX Current Limit Circuit: Typ. 1A
• Package: U-DFN1616-6
DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M
Pow er Analog Microelectronics, Inc.
Rev. V2.0
April. 2014
1
AP3403
EVB User Guide
CONFIDENTIAL INFORMATION
3. EV Board Schematic
4. EVB AP3403 Description
AP3403 is an evaluation board for the AP3403, a DC/DC converter. The board is
targeted to be used in providing a simple and convenient evaluation environment for the
AP3403. Requires parts, power supply connectors etc. on the board, which makes it
easy to be evaluated.
5. Recommended External Components
Symbol
CIN
COUT
Value
4.7uF
10uF
Components
Part Number
C1005X5R0J475M (TDK)
Ceramic
JMK105BBJ475MV (Taiyo Yuden)
Capacitor
GRM155R60J475ME47 (Murata)
Ceramic
GRM155R60J106ME44 (Murata)
Capacitor
JMK105CBJ106MV (Taiyo Yuden)
LQM21PN2R2NGC (Murata)
2.2uH
L
CIG21L2R2MNE (Samsung Electro-Mechanics)
MIPSZ2012D2R2 L (FDK)
Inductor
4.7uH
CIG21L4R7MNE (Samsung Electro-Mechanics)
MIPS2520D4R7 (FDK)
DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M
Pow er Analog Microelectronics, Inc.
Rev. V2.0
April. 2014
2
AP3403
EVB User Guide
CONFIDENTIAL INFORMATION
6. Inductance Select for Output Voltage Setting
Vo
1.0V
1.2V
1.5V
1.8V
L
2.2uH
2.2uH
2.2uH
2.2uH
2.5V
2.8V
3.3V
2.2uH
4.7uH
4.7uH
7. Resistor & Capacitor Select for Output Voltage Setting
The output voltage (VOUT) is adjustable by changing the R1 and R2 values as
follows.
(0.7V≤VOUT≤5.5V, VFB=0.6V)
VOUT = VFB × (R1 + R2) / R2
Set Output Valtage(V)
Resistor(KΩ)
Capacitor(pF)
VSET
R1
R2
Cff
1.0
120
180
22
1.2
180
180
22
1.5
270
180
22
1.8
240
120
22
2.5
380
120
15
2.8
275
75
15
3.3
270
60
15
8. EV Board BOM List
VSET=1.8V
Item
Value
Type
Rating
Description
CIN
4.7uF
0805
25V
Input Capacitor
COUT
10uF
0805
16V
Output Capacitor
Cff
22pF
0805
50V
Feed Forward Capacitor
L
2.2uH
>1A
Inductor
R1
121KΩ
0805
1%
R2
121KΩ
0805
1%
R3
121KΩ
0805
1%
IC
AP3403
Voltage Set Resistor
U-DFN1616-6
DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M
Pow er Analog Microelectronics, Inc.
Rev. V2.0
April. 2014
3
AP3403
EVB User Guide
CONFIDENTIAL INFORMATION
9. EV Board View
10. PCB Layout Example
Top Layer
Bottom Layer
DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M
Pow er Analog Microelectronics, Inc.
Rev. V2.0
April. 2014
4
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