Diodes AP3410 User Manual

1.5MHz Synchronous Step-down DC-DC Converter AP3410

Preliminary Datasheet

General Description

The AP3410 is a high efficiency step-down DC-DC
voltage converter. The chip operation is optimized by
peak-current mode architecture with built-in
synchronous power MOSFET switchers. The
oscillator and timing capacitors are all built-in
providing an internal switching frequency of 1.5MHz
that allows the use of small surface mount inductors
and capacitors for portable product implementations.

Integrated Soft Start (SS), Under Voltage Lock Out
(UVLO), Thermal Shutdown Detection (TSD) and
Short Circuit Protection are designed to provide
reliable product applications.

The device is available in adjustable output voltage
version ranging from 0.6V to 0.9×V
voltage range is from 2.5V to 5.5V, and is able to
deliver up to 1.2A.

The AP3410 is available in SOT-23-5 and
DFN-2×2-6 packages.

when input

IN

Features

• High Efficiency Buck Power Converter

• Wide Input Voltage Range: 2.5V to 5.5V

• Adjustable Output Voltage: 0.6V to 0.9×V

• Low R

• Built-in Power Switches for Synchronous
Rectification with High Efficiency

• Output Current: 1.2A

• Feedback Voltage: 600mV

• 1.5MHz Constant Frequency Operation

• Thermal Shutdown Protection

• Low Dropout Operation at 100% Duty Cycle

• No Schottky Diode Required

• Input Over Voltage Protection

• Output Over Voltage Protection

• Over Current Protection

Internal Switches:200mΩ (VIN=5V)

DS(ON)

IN

Applications

• Post DC-DC Voltage Regulation

• PDA and Notebook Computer

SOT-23-5 DFN-2×2-6

Figure 1. Package Types of AP3410

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Preliminary Datasheet

1.5MHz Synchronous Step-down DC-DC Converter AP3410

Pin Configuration

K Package DN Package

(SOT-23-5) (DFN-2×2-6)

EN

GND

LX

1

2

34

Pin Description

Pin Number

SOT-23-5 DFN-2×2-6

FB

5

VIN

Figure 2. Pin Configuration of AP3410 (Top View)

Pin Name Function

1 2 EN Chip enable pin. Active high
2 5 GND Ground pin
3 4 LX Switch output pin
4 3 VIN Power supply
5 6 FB Feedback voltage of output

1 NC No internal connection

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Preliminary Datasheet

1.5MHz Synchronous Step-down DC-DC Converter AP3410

Functional Block Diagram

Figure 3. Functional Block Diagram of AP3410

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Preliminary Datasheet

1.5MHz Synchronous Step-down DC-DC Converter AP3410

Ordering Information

AP3410 -

G1: Green

Circuit Type
K: SOT-23-5

DN: DFN-2×2-6

Package

SOT-23-5 -40 to 85ºC AP3410KTR-G1 GHW Tape & Reel

Temperature

Range

Part Number

TR: Tape & Reel

Marking

ID

Packing Type

DFN-2×2-6 -40 to 85ºC AP3410DNTR-G1 CJ Tape & Reel

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Input Voltage for the MOSFET Switch VIN 0 to 6.0 V
Enable Input Voltage VEN -0.3 to VIN+0.3 V
LX Pin Switch Current ILX 1.8 A

Power Dissipation (on PCB, TA=25°C) PD

Thermal Resistance (Junction to Ambient,
Simulation)

Thermal Resistance (Junction to Case,
Simulation)

Operating Junction Temperature TJ 155 ºC
Storage Temperature T
Operating Temperature TOP -40 to 85 ºC
ESD (Machine Model) VMM 200 V
ESD (Human Body Model) 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.

θ

JA

θ

JC

-55 to 150 ºC

STG

2000 V

HBM

SOT-23-5 0.4

DFN-2×2-6 1.89

SOT-23-5

DFN-2×2-6

SOT-23-5 130 ºC/W

250

53

W

ºC/W

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Preliminary Datasheet

1.5MHz Synchronous Step-down DC-DC Converter AP3410

Recommended Operating Conditions

Parameter Symbol Min Max Unit

Supply Input Voltage VIN 2.5 5.5 V
Operating Ambient Temperature TA -40 85 ºC
Operating Junction Temperature TJ -40 125 ºC

Electrical Characteristics

VIN=VEN=5V, V
specified.

Parameters Symbol Conditions Min Typ Max Unit

=1.2V, VFB=0.6V, L=2.2µH, CIN=4.7µF, C

OUT

=10µF, TA=25°C, unless otherwise

OUT

Input Voltage Range VIN 2.5 5.5 V
Shutdown Current I
Active Current ION V

Regulated Feedback
Voltage
Regulated Output
Voltage Accuracy

∆V

Peak Inductor Current I
Oscillator Frequency f
PMOSFET R
NMOSFET R

R

DS(ON)

R

DS(ON)

EN High Level Input
Voltage
EN Low Level Input
Voltage

EN Input Current IEN 0.1
Soft Start Time t
Maximum Duty Cycle D

VEN=0 0.1

OFF

=0.55V 220

FB

0.588 0.6 0.612 V

V

FB

V

=2.5V to 5.5V,

IN

OUT/VOUT

PK

OSC

DS(ON)P

DS(ON)N

V

EN_H

V

EN_L

V

=0 to 1.2A

I

OUT

=2.5V to 5.5V 1.2 1.5 1.8 MHz

IN

VIN=5V 200
VIN=5V 200

1.5 V

-3 3 %

1.5

1.9

0.4 V

µA
µA

mΩ
mΩ

µA

SS

MAX

400

100 %

A

µs

Rising 2.3
Under Voltage Lock
Out Threshold

V

UVLO

2.1

V Falling

Hysteresis 0.2
Thermal Shutdown T

Hysteresis=30°C

SD

155 160 °C

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Preliminary Datasheet

1.5MHz Synchronous Step-down DC-DC Converter AP3410

Typical Performance Characteristics

VIN=5V, TA=25°C, unless otherwise noted.

100

95
90
85
80
75
70
65
60

Efficiency (%)

55
50
45
40

0.0 0.2 0.4 0.6 0.8 1.0 1.2

V

OUT_AC

10mV/div

V

SW

2V/div

500mA/div

I

Figure 4. Efficiency vs. Output Current

L

Figure 6. Output Ripple (I

Output Current (A)

Time 800µs/div

0.70

0.68

0.66

0.64

0.62

VIN=5.0V

V
V
V
V
V

OUT
OUT
OUT
OUT
OUT

=1.0V
=1.2V
=1.8V
=2.5V
=3.3V

0.60

0.58

0.56

0.54

Regulated Feedback Voltage (V)

0.52

0.50

-40 -20 0 20 40 60 80 100 120 140

Temperature (oC)

Figure 5. Regulated Feedback Voltage vs. Temperature

V

OUT_AC

10mV/div

V

SW

2V/div

I

L

1A/div

Time 400ns/div

=0A) Figure 7. Output Ripple (I

OUT

VIN=5.0V

=1.2A)

OUT

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Preliminary Datasheet

1.5MHz Synchronous Step-down DC-DC Converter AP3410

Typical Performance Characteristics (Continued)

V

=5V, T

IN

=25°C, unless otherwise noted.

A

V

5V/div

V

SW

5V/div

V

OUT

1V/div

EN

500mA/div

I

L

Time 200µs/div

Figure 8. Enable Turn On (I

=1.2A) Figure 9. Enable Turn Off (I

OUT

V

EN

5V/div

V

SW

5V/div

V

OUT

1V/div

500mA/div

I

L

Time 800µs /div

=1.2A)

OUT

V

OUT

1V/div

V

SW

5V/div

V

OUT

1V/div

V

SW

5V/div

I

2A/div

L

2A/div

I

L

Time 200µs/div

Time 200µs /div

Figure 10. Short Circuit Protection (I

=1.2A) Figure 11. Short Circuit Protection Recovery (I

OUT

=1.2A)

OUT

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Preliminary Datasheet

1.5MHz Synchronous Step-down DC-DC Converter AP3410

T ypical Application

Figure 12. Typical Applications of AP3410

Table 1. Component Guide

V

(V)

OUT

3.3 450 100 2.2

2.5 320 100 2.2

1.8 200 100 2.2

1.2 100 100 2.2

1.0 66 100 2.2

R1 (kΩ) R2 (kΩ) L (µH)

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Preliminary Datasheet

1.5MHz Synchronous Step-down DC-DC Converter AP3410

Mechanical Dimensions

SOT-23-5 Unit: mm(inch)

2.820(0.111)

0.100(0.004)

0.200(0.008)

0°

8°

0.950(0.037)

P

Y

T

3.100(0.122)

1.800(0.071)

2.000(0.079)

0.300(0.012)

0.500(0.020)

0.200(0.008)

0

(

0

0

7

.

0

.

R

E

F

)

8

2

0

0

(

0

0

0

.

0

0

5

1

.

0

0

(

0

0

9

.

0

3

.

1

3

0

.

0

(

0

0

5

0

.

)

0

0

.

0

0

(

)

6

0

0

.

)

5

)

1

Mar. 2013 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

1.5MHz Synchronous Step-down DC-DC Converter AP3410

Mechanical Dimensions (Continued)

DFN-2×2-6 Unit: mm(inch)

Mar. 2013 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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