Diodes AP3015 User manual

Demo Board Manual --- DB-A
Micro Power Step-Up DC/DC Converter AP3015
August. 2006 Rev. 1.2 BCD Semiconductor Manufacturing Limited
1
Content:
1. Description
2. Specification
3. Schematic of the Demo Board
4. PCB Layout
5. Photo View of the Demo Board
6. PCB Dimensions
7. BOM
8. Test Result

Demo Board Manual --- DB-A
Micro Power Step-Up DC/DC Converter AP3015
August. 2006 Rev. 1.2 BCD Semiconductor Manufacturing Limited
2
Description
The AP3015 is a step-up DC/DC converter, which can be used for 1 or 2 cell powered system. In
fact, it is a standard boost circuit, where the AP3015 works as the driver and control device.
The AP3015 features a wide input voltage range. The operation voltage is ranged from 1.2V to
12V. And the output voltage is up to 34V. A current limited, fixed off-time control scheme conserves
operating current, resulting in high efficiency over a broad range of load current. The switch and all
of the control circuit are integrated in the AP3015, so fewer tiny external components are needed in
the PCB board, which are bypass capacitor (Cin), boost inductor (L), boost schottky diode (D),
output capacitor (Cout), feedback resistor network (R1,R2) and feedback capacitor (Cf).
The demo board can be powered from 1.2V to 2.5V. The output voltage can be controlled by the
feedback resistor network. The feedback reference is 1.23V, so the output voltage can be calculated
as 1.23*(R2+R1)/R2. To achieve at flexible operation, a disable terminal is designed to turn on or
turn off the demo board output.
Specification
Item Value
Supply Voltage 1.2 to 2.5V
40mA@Vin=1.2V
50mA@Vin=1.5V
Output Current (Max.)
80mA@Vin=2.5V
Output Voltage 3.3V±5%
Ripple & Noise (Max.) 150mV
70%@ Vin=1.2V,Io=40mA
73％@Vin=1.5V,Io=50mA
Efficiency (Typ.)
81％@Vin=2.5V,Io=80mA

Demo Board Manual --- DB-A
Micro Power Step-Up DC/DC Converter AP3015
August. 2006 Rev. 1.2 BCD Semiconductor Manufacturing Limited
3
Schematic of the Demo Board
Cin
4.7u
L
10u
R1
1M
Cout1
10u
R2A
1M
Cf
10p
1
2
3
4
5
J1
1
2
3
4
5
J2
D
SS14
R2B
1.5M
Cout2
10u
Vin 5
SW 1
GND
2
FB 3 SHDN
4
AP3015/A
U1
Note: Cout2 is backup. Figure 1
PCB Layout
Figure 2

Demo Board Manual --- DB-A
Micro Power Step-Up DC/DC Converter AP3015
August. 2006 Rev. 1.2 BCD Semiconductor Manufacturing Limited
4
Photo View of the Demo Board
Figure 3
PCB Dimensions
57.5mm
35mm

Demo Board Manual --- DB-A
Micro Power Step-Up DC/DC Converter AP3015
August. 2006 Rev. 1.2 BCD Semiconductor Manufacturing Limited
5
BOM
Item Quantity Location Part Footprint
1 1 U1 AP3015 SOT23-5
2 1 L 10uF, Sumida: CDRH5D28RNP-100NC SMD
3 1 Cin 4.7uF, X7R Ceramic 1206
4 1 Cout1 10uF, X7R Ceramic 1206
5 1 Cf 10pF, X7R Ceramic 0805
6 1 D SS14, Schottky SMD
7 1 R1 1M, 1% 0805
8 1 R2A 1M, 1% 0805
9 1 R2B 1.5M, 1% 0805
10 2 J1, J2 5 Pin Connector SIP-5
11 1 Cout2 NC
Test Result
1) Output Voltage
Vin Vout @ Iout=0mA Vout @ Io=40mA Vout @ Io= 50mA Vout @ Io= 100mA
1.2V 3.299V 3.185V --- ---
1.5V 3.302V 3.225 3.189V ---
2.5V 3.324V 3.302V 3.289V 3.218V
2) Ripple & Noise
Vin=1.2V, Iout=40mA Vin=1.5V, Iout=50mA

Demo Board Manual --- DB-A
Micro Power Step-Up DC/DC Converter AP3015
August. 2006 Rev. 1.2 BCD Semiconductor Manufacturing Limited
6
Vin=2.5V, Iout=100mA
3) Efficiency
0.1 1 10 100
40
45
50
55
60
65
70
75
80
85
Efficiency (%)
Output Current (mA)
AP3015 Output Capability & Efficiency
Vo=3.3V, L=10uF
Vin=2.5V
Vin=1.5V
Vin=1.2V
Note: The Max. Output Capability is 46mA @ Vin=1.2V, 55mA @Vin=1.5V and 125mA @Vin=2.5V.
The recommended maximum Output Capability is 40mA @ Vin=1.2V, 50mA @Vin=1.5V and 100mA
@Vin=2.5V.