Fairchild FAN4603 service manual

August 2010

FAN4603 600mA, Fully Integrated, Buck Power Supply Module

FAN4603 — 600mA, Fully Integrated Buck Power Supply Module

Features

 Solder and Play DC/DC Converter;

No External Components Required

 Up to 91% Efficiency  600mA Output Current Capability  2.3V to 5.5V Input Voltage Range  Fixed Output Voltages from 1.0V to 1.8V  35µA PFM Quiescent Current  Best-in-Class Load and Line Transient Response  ±2% PWM DC Voltage Accuracy  No External Components Required  High-Efficiency, Low-Ripple, Light-Load PFM  Thermal Shutdown (TSD), Under-Voltage Lockout,

(UVLO), and Short-Circuit (SCP) Protection

 4.0 x 2.5mm MLP Package  Maximum Height: 1.1mm

Applications

 POL and Distributed DC-DC Module Applications  Small Form Factor, Battery-Powered Applications  POL Core Power for FPGA, DSP, CPU, and GPU with

Fast-Transient, Wide Dynamic Load Requirements

 Wireless Cards, Meters, Hearing Aids, Bluetooth

Headsets, POS Equipment, VOIP, PDAs, MIDs, Netbooks, and Servers

Description

The FAN4603 is a fully integrated synchronous DC/DC buck converter that provides up to 600mA of output current over an input voltage ranging from 2.3V to 5.5V. It provides a fixed output voltage level ranging from 1.0V to 1.8V. Other voltage options are available on request.

The FAN4603 converter is offered as an ultra-miniature “Solder and Play” solution that requires no external components and is able to achieve a DC accuracy of ±2% PWM and an output ripple less than 12mV.

Total footprint is 4.0 x 2.5mm with a maximum height of

1.1mm. It can be used in small battery-powered devices and applications with distributed DC POL requirements.

At moderate and light loads, pulse frequency modulation is used to operate the device in power-save mode with a typical quiescent current of 35µA. Even with such a low quiescent current, the part exhibits excellent transient response during large load swings. At higher loads, the system automatically switches to fixed-frequency control.

In shutdown mode, the supply current drops below 2µA, reducing power consumption.

Ordering Information

Part Number Output Voltage

FAN4603MM18X 1.82V

FAN4603MM15X 1.5V

FAN4603MM13X 1.3V

FAN4603MM12X 1.23V

FAN4603MM10X 1.0V

Note:

1. Other voltage options are available on request. Contact a Fairchild representative.

(1)

Package Temperature Range Packing

6-Lead Molded Leadless Package (MLP), 4 x 2.5 x 1mm

–40 to 85°C

Tape and

Reel

Typical Application

Pin Configuration

FAN4603 — 600mA, Fully Integrated Buck Power Supply Module

Figure 1. Typical Application

Figure 2. MLP 4.0 x 2.5 mm (Top View) Figure 3. 3D Package View

Pin Definitions

Pin # Name Description

1 VIN

2 EN

3 SW

4 VOUT

5 FB

6 GND

P1 GND

Input Voltage. Connect to input power source Enable. The device is in shutdown mode when voltage to this pin is <0.4V and enabled when >1.2V.

Do not leave this pin floating.

Switching Node. Leave this pin floating. Output Voltage. Connect to Load. Feedback/V Ground. Power and IC ground. All signals are referenced to this pin. Optional Ground Connection. Not typically used.

. This pin must be shorted directly to VOUT (Pin 4).

OUT

FAN4603 — 600mA, Fully Integrated Buck Power Supply Module

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.

Symbol Parameter Min. Max. Units

VIN

TJ Junction Temperature -40 +150 °C

STG

TL Lead Temperature (Soldering, 10 Seconds) +260 °C

ESD

Input Voltage with Respect to GND -0.3 6.0 V

Voltage on Any Other Pin with Respect to GND -0.3 VIN V

Storage Temperature -65 +150 °C

Electrostatic Discharge Capability

Human Body Model JESD22-A114 6

Charged Device Model, JESD22-C101 2

Recommended Operating Conditions

The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings.

Symbol Parameter Min. Max. Units

VCC Supply Voltage Range 2.3 5.5 V

Output Current 0 600 mA

OUT

TA Operating Ambient Temperature -40 +85 °C

TJ Operating Junction Temperature -40 +125 °C

Thermal Properties

Symbol Parameter Typical Units

ΘJA Junction-to-Ambient Thermal Resistance

Note:

2. Junction-to-ambient thermal resistance is a function of application and board layout. This data is measured with a twolayer 2s0p board in accordance to the JESD51- JEDEC standard. Special attention must be paid not to exceed junction temperature T

at a given ambient temperature TA.

J(max)

(2)

120

°C/W

Electrical Specifications

Unless otherwise noted, VIN = 2.5 to 5.5V, EN = VIN. TA = -40°C to +85°C, using circuit of Figure 1. Typical values are at

, TA = 25°C.

3.6V

Symbol Parameter Conditions Min. Typ. Max. Units

Power Supplies

IQ Quiescent Current 35 55 µA

ISD Shutdown Supply Current VIN = 3.6V, EN = GND 0.1 2.0 µA

Under-Voltage Lockout Threshold Rising VIN 2.15 2.25 V

UVLO

Oscillator

Regulation

Under-Voltage Lockout Hysteresis 150 mV

UVHYST

Enable HIGH-Level Input Voltage 1.05 V

ENH

Enable LOW-Level Input Voltage 0.4 V

ENL

Enable Logic Input Hysteresis 100 mV

EN_HYS

IEN Enable Input Leakage Current EN = VIN or GND 0.01 1.00 µA

Oscillator Frequency

OSC

(3)

PWM Mode 5.4 6.0 6.6 MHz

FAN4603 — 600mA, Fully Integrated Buck Power Supply Module

= 0 to 600mA 1.784 1.820 1.890

1.82V

LOAD

PWM Mode 1.784 1.820 1.856

= 0 to 600mA 1.470 1.500 1.560

1.50V

LOAD

PWM Mode 1.470 1.500 1.530

= 0 to 600mA 1.274 1.300 1.352

VO Output Voltage Accuracy

1.30V

LOAD

PWM Mode 1.274 1.300 1.326

= 0 to 600mA 1.207 1.233 1.283

1.23V

LOAD

PWM Mode 1.207 1.233 1.260

= 0 to 600mA 0.975 1.000 1.050

1.00V

LOAD

PWM Mode 0.975 1.000 1.025

tSS Soft-Start Time Rising EN to V

Regulation 180 300 µs

OUT

Protection

Peak Input Current Limit 850 1050 1250 mA

LIM

Thermal Shutdown +150 °C

TSD

Thermal Shutdown Hysteresis +15 °C

HYS

Note:

3. PWM frequency may be lower than specified when limited by t

(minimum on-time) or t

ON-min

(minimum off-time), at

OFF_min

duty cycle extremes, but output regulation is maintained.

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