Diodes Ap61300 Ev M 2.3v To 5.5v Input 3a Synchronous Buck Converter User Guide

AP61300 EV M 2.3v To 5.5v Input 3a Synchronous Buck Converter

AP61300Z6-EVM
2.3V TO 5.5V INPUT, 3A SYNCHRONOUS BUCK CONVERTER

Description
The DIODESTM AP61300 is a 3A, synchronous buck converter with an input voltage range of 2.4V to 5.5V and fully integrates a 70m highside power MOSFET and a 50m low-side power MOSFET to provide high-efficiency step-down DC-DC conversion.

Pin Assignments

The AP61300 device is easily used by minimizing the external component count due to its adoption of constant on-time (COT) control to achieve fast transient responses, ease loop stabilization, and low output voltage ripple. Moreover, AP61300 also features force PWM mode control through EN pin.

The device is available in a SOT563 package.

Features
Input Range: 2.4V to 5.5V Wide Output Voltage Range: 0.6V to VIN 3A Continuous Output Current 0.6V ± 2% Reference Voltage 19µA Ultralow Quiescent Current (Pulse Frequency Modulation) 2.2MHz Switching Frequency Programmable Modulation Mode Through EN
o PFM (Vin ­VEN < 200mV) o PWM Regardless of Output Load ( Vin ­VEN > 200mV )
Protection Circuitry o Undervoltage Lockout (UVLO)
o VIN Overvoltage Protection (OVP)
o Peak Current Limit
o Valley Current LimitThermal Shutdown

Applications
5V Input Distributed Power Bus Supplies White Goods and Small Home Appliances FPGA, DSP, and ASIC Supplies Network Video Cameras Wireless Routers Consumer Electronics General Purpose Point of Load

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Functional Block

AP61300Z6-EVM
2.3V TO 5.5V INPUT, 3A SYNCHRONOUS BUCK CONVERTER

Figure 1. Functional Block Diagram

Absolute Maximum Ratings (Note 1) At TA = +25°C, unless otherwise specified.)

Symbol
VIN
VFB
VSW
VEN TST TJ TL ESD Susceptibility (Note 2) HBM CDM

Parameter
Supply Pin Voltage Feedback Pin Voltage
Switch Pin Voltage Enable Pin Voltage Storage Temperature Junction Temperature Lead Temperature
Human Body Model Charged Device Model

Rating

Unit

-0.3 to +6.5 (DC) V
-0.3 to + 7.0 (400ms)

-0.3 to VIN + 0.3

V

-1.0 to VIN + 0.3 (DC)

-2.5 to VIN + 2.0 (20ns)

V

-0.3 to VIN + 0.3

V

-65 to +150

°C

+160

°C

+260

°C

6000

V

1500

V

Notes:

1. Stresses greater than the Absolute Maximum Ratings specified above may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not im plied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time.
2. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be take n when handling and transporting these devices.

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AP61300Z6-EVM
2.3V TO 5.5V INPUT, 3A SYNCHRONOUS BUCK CONVERTER

Recommended Operating Conditions (At TA = +25°C, unless otherwise specified.)

Symbol

Parameter

Min

Max

Unit

VIN

Supply Voltage

2.4

5.5

V

VOUT

Output Voltage

0.6

VIN

V

TA

Operating Ambient Temperature Range

-40

+85

°C

TJ

Operating Junction Temperature Range

-40

+125

°C

Quick Start Guide:
The AP61300Z6-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP61300Z6, follow the procedure below:
1. For evaluation board configured at VOUT=1.8V, connect a power supply to the input terminals VIN and GND. Set VIN to 5V. 2. Connect the positive terminal of the electronic load to VOUT and negative terminal to GND. 3. For Enable, place a jumper to “H” position to enable IC. Jump to “L” position to disable IC.
4. The evaluation board should now power up with a 1.8V output voltage. 5. Check for the proper output voltage of 1.8V (±1%) at the output terminals VOUT and GND. Measurement can also be done with a multimeter with the positive and negative leads between VOUT and GND. 6. Set the load to 3A through the electronic load. Check for the stable operation of the SW signal on the oscilloscope. Measure the switching frequency.
Measurement Performance Guidelines:
1) When measuring the output voltage ripple, maintain the shortest possible ground lengths on the oscilloscope probe. Long ground leads can erroneously inject high frequency noise into the measured ripple.
2) For efficiency measurements, connect an ammeter in series with the input supply to measure the input current. Connect an electronic load to the output for output current. Test the input capacitor voltage and output capacitor voltage with a multimeter as input voltage and output voltage.

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AP61300Z6-EVM
2.3V TO 5.5V INPUT, 3A SYNCHRONOUS BUCK CONVERTER

Setting the Output Voltage of AP61300
1) Setting the output voltage

The AP61300 features external programmable output voltage by using a resistor divider network R1 and R2 as shown in the typical application circuit. The output voltage is calculated as below,

VOUT

0.6

R1

R2

R

2

First, select a value for R2 according to the value recommended in the table 1. Then, R2 is determined. The output voltage is given by Table 1 for reference. For accurate output voltage, 1% tolerance is required.

Table 1. Resistor selection for output voltage setting

Evaluation Board Schematic

VIN=5V
C1 Open
H EN
L

VIN
C2 22uF
R3 100k
EN

AP61300

VOUT SW
FB GND

SW

L
1.0uH
C5 Open

R1 200k

R2 100k

Figure 2. Typical Application Circuit

VOUT=1.8V
C3 C4 22uF Open

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PCB Top Layout

AP61300Z6-EVM
2.3V TO 5.5V INPUT, 3A SYNCHRONOUS BUCK CONVERTER

PCB Bottom Layout

Figure 3. AP61300Z6 – EVM – Top Layer

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Figure 4. AP61300Z6 – EVM – Bottom Layer 5 of 9

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EV Board View

AP61300Z6-EVM
2.3V TO 5.5V INPUT, 3A SYNCHRONOUS BUCK CONVERTER

Figure 5. AP61300Z6 EV Board View

Bill Of Materials for AP61300Z6-EVM (VOUT=1.8V)

Item

Value

Type

Rating

Descriptio n

C2

22µF

X5R/X7R, Ceramic/0805

10V

Input coupling CAP

C3

22µF

X5R/X7R, Ceramic/0805

10V

Output coupling CAP

L

1.0µH

SMD

>5A

Inductor

R1

200K

R2

100K

R3

100K

U1

0805 0805 0805 AP61300

1% Voltage set RES*
1%

1%

EN RES*

SOT563

Descriptio n TAIYO YUDEN EMK212ABJ106KD-T TAIYO YUDEN EMK212ABJ106KD-T WURTH ELEC 744 383 560 10
Diodes BCD

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AP61300Z6-EVM
2.3V TO 5.5V INPUT, 3A SYNCHRONOUS BUCK CONVERTER
Typical Performance Characteristics
Figure 6. PFM Efficiency vs. Output Current

Figure 7. PWM Efficiency vs. Output Current

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AP61300Z6-EVM
2.3V TO 5.5V INPUT, 3A SYNCHRONOUS BUCK CONVERTER
Figure 8. Output Voltage Ripple, IOUT = 50mA

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Figure 9. Output Voltage Ripple, IOUT =3A 8 of 9

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AP61300Z6-EVM
2.3V TO 5.5V INPUT, 3A SYNCHRONOUS BUCK CONVERTER

IMPORTANT NOTICE

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References

• didoes.com
• Diodes Incorporated - Analog, Discrete, Logic, Mixed-Signal
• Important Notice
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