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Preliminary Datasheet

2A, 4MHz High Efficiency Synchronous Buck Converter AP3408

Jan. 2013 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

General Description

The AP3408 is a current mode, PWM synchronous

buck DC/DC converter, capable of driving a 2A load

with high efficiency, excellent line and load

regulation. It operates in continuous PWM mode.

The AP3408 integrates synchronous P-channel and

N-channel power MOSFET switches with low

on-resistance. It is ideal for portable applications

powered from a single Li-ion battery. 100% duty

cycle and low on-resistance P-channel internal power

MOSFET can maximize the battery life.

The switching frequency of AP3408 can be

programmable from 300kHz to 4MHz, which allows

small-sized components, such as capacitors

and

inductors

A standard series of inductors from several

different manufacturers are available. This feature

greatly simplifies the design of switch-mode power

supplies.

The AP3408 is available in DFN-3×3-10 and PSOP-8

packages.

Features

•

Input Voltage Range: 2.6 to 5.5V

• Adjustable Output from 0.8 to 5V

• 0.8V Reference Voltage with ± 2% Precision

• Output Current: 2A

• High Efficiency up to 95%

• Low R

DSON

Internal Switches

• Programmable Frequency: 300kHz to 4MHz

• Current Mode Control

• Forced Continuous-mode Operation

• 100% Duty Cycle

• Synchronizable Switching Frequency

•

Power Good Output Voltage Monitoring

• Built-in Soft-start

• Built-in Short Circuit Protection

• Built-in Thermal Shutdown Protection

• Built-in Current Limit Function

Applications

• Portable Media Player

• Digital Still and Video Cameras

• Notebook

Figure 1. Package Types of AP3408

DFN-3×3-10 PSOP-8

Summary of content (12 pages)

PAGE 1
Preliminary Datasheet 2A, 4MHz High Efficiency Synchronous Buck Converter General Description Features The AP3408 is a current mode, PWM synchronous buck DC/DC converter, capable of driving a 2A load with high efficiency, excellent line and load regulation. It operates in continuous PWM mode. • • • • • • • • • • • • • • • • The AP3408 integrates synchronous P-channel and N-channel power MOSFET switches with low on-resistance. It is ideal for portable applications powered from a single Li-ion battery.
PAGE 2
Preliminary Datasheet 2A, 4MHz High Efficiency Synchronous Buck Converter AP3408 Pin Configuration DN Package MP Package (DFN-3×3-10) (PSOP-8) Pin 1 Mark SHDN/ RT 1 10 COMP SYNC 2 9 FB GND 3 8 PGOOD SW 4 7 VDD PGND 5 6 PVDD Exposed Pad Connected to PGND SHDN/RT 1 GND 2 SW 3 PGND 4 Exposed Pad Connected to PGND 8 COMP 7 FB 6 VDD 5 PVDD Figure 2.
PAGE 3
Preliminary Datasheet 2A, 4MHz High Efficiency Synchronous Buck Converter AP3408 Functional Block Diagram SHDN/RT 1(1) SYNC 0.8V 9(7) FB EA Clamp PWM OCP 4(3) SS 0.7V 5(4) PGND 0.9V 8 SW Control Logic 0.4V PGOOD PVDD SUM Oscillator 10(8) COMP 6(5) CS SD Driver 2 DC VREF 3(2) UVLO OTP GND 7(6) A (B) A for DFN-3X3-10 B for PSOP-8 VDD Figure 3. Functional Block Diagram of AP3408 Jan. 2013 Rev. 1.
PAGE 4
Preliminary Datasheet 2A, 4MHz High Efficiency Synchronous Buck Converter AP3408 Ordering Information AP3408 G1: Green Circuit Type TR: Tape & Reel Blank: Tube Package DN: DFN-3×3-10 MP: PSOP-8 Package Temperature Range DFN-3×3-10 PSOP-8 -40 to 125°C Part Number Marking ID Green Green Packing Type AP3408DNTR-G1 BFA AP3408MP-G1 3408MP-G1 Tape & Reel Tube AP3408MPTR-G1 3408MP-G1 Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS
PAGE 5
Preliminary Datasheet 2A, 4MHz High Efficiency Synchronous Buck Converter AP3408 Recommended Operating Conditions Parameter Symbol Min Max Unit Input Voltage VIN 2.6 5.5 V IOUT (MAX) 2 TJ -40 Maximum Output Current Operating Junction Temperature A 125 ºC Electrical Characteristics VIN=VDD =VPVDD=3.3V, TA=25℃, unless otherwise specified. Parameters Symbol Conditions Min Typ Max Unit 5.
PAGE 6
Preliminary Datasheet 2A, 4MHz High Efficiency Synchronous Buck Converter AP3408 Electrical Characteristics (Continued) VIN=VDD =VPVDD=3.3V, TA=25℃, unless otherwise specified. Parameters Symbol Conditions Min Typ Max Unit OSCILLATOR SECTION RT Pin Voltage VRT Switching Frequency fOSC Maximum Duty Cycle DMAX 0.8 1 V ROSC=330kΩ 0.8 1.2 MHz ADJ Frequency 0.3 4 MHz VFB=0.75V 100 ILIMIT VFB=0.75V 2.2 RPDSON ISW=500mA 0.11 0.16 Ω RNDSON ISW=-500mA 0.11 0.17 Ω VDD-0.
PAGE 7
Preliminary Datasheet 2A, 4MHz High Efficiency Synchronous Buck Converter AP3408 Typical Performance Characteristics VIN=VDD =VPVDD=3.3V, TA=25℃, unless otherwise specified. 700 600 600 Supply Current (µA) Supply Current (µA) 500 400 300 500 400 300 VIN=3.3V 200 200 VFB=0.75V VFB=0.75V 100 -60 100 2.5 3.0 3.5 4.0 4.5 5.0 5.5 -30 0 6.0 30 60 90 120 150 o Ambient Temperature ( C) Input Voltage (V) Figure 5. Supply Current vs. Ambient Temperature Figure 4.
PAGE 8
Preliminary Datasheet 2A, 4MHz High Efficiency Synchronous Buck Converter AP3408 Typical Performance Characteristics (Continued) VIN=VDD =VPVDD=3.3V, TA=25℃, unless otherwise specified. 1.2 140 Frequency (MHz) NMOS ON Resistance (mΩ) 1.1 120 100 80 0.9 ROSC=330k 0.8 VIN=3.3V 60 1.0 VIN=3.3V VFB=0.85V -60 -30 0 30 60 90 120 VOUT=2.5V 0.7 -60 150 -30 0 30 60 90 120 150 O o Ambient Temperature ( C) Ambient Temperature ( C) Figure 8. NMOS ON Resistance vs.
PAGE 9
Preliminary Datasheet 2A, 4MHz High Efficiency Synchronous Buck Converter AP3408 Typical Application Figure 12. Typical Application of AP3408 Jan. 2013 Rev. 1.
PAGE 10
Preliminary Datasheet 2A, 4MHz High Efficiency Synchronous Buck Converter AP3408 Mechanical Dimensions DFN-3×3-10 Unit: mm(inch) 1.600(0. 063) 0.300(0. 012) 1.800(0. 071) 0.500(0. 020) 0.500(0. 020) 2.900(0. 114) TYP 3.100(0.122) N6 N10 2.300(0. 090) 2.500(0. 098) 2.900(0. 114) PIN #1 IDENTIFICATION See DETAIL A 3.100(0. 122) Pin 1 Mark N5 N1 0.200(0. 008) 0.700(0.028) 0.800(0. 031) 0.000(0. 000) 0.300(0. 012) DETAIL A 0.050(0. 002) 0.153(0. 006) 0.253(0.
PAGE 11
Preliminary Datasheet 2A, 4MHz High Efficiency Synchronous Buck Converter AP3408 Mechanical Dimensions (Continued) Unit: mm(inch) 3.202(0.126) 3.402(0.134) PSOP-8 Jan. 2013 Rev. 1.
PAGE 12
BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein.