FAN5350_08 FAIRCHILD [Fairchild Semiconductor], FAN5350_08 Datasheet

FAN5350_08

Manufacturer Part Number

FAN5350_08

Description

3MHz, 600mA Step-Down DC-DC Converter in Chip-Scale and MLP Packaging

Manufacturer

FAIRCHILD [Fairchild Semiconductor]

Datasheet

1.FAN5350_08.pdf (15 pages)

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FAN5350 Rev. 1.0.3

FAN5350

3MHz, 600mA Step-Down DC-DC Converter in

Chip-Scale and MLP Packaging

Features

Applications

Ordering Information

Please refer to tape and reel specifications on www.fairchildsemi.com; http://www.fairchildsemi.com/packaging.

Part Number

FAN5350UCX

FAN5350MPX

For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.

3MHz Fixed-Frequency Operation

16µA Typical Quiescent Current

600mA Output Current Capability

2.7V to 5.5V Input Voltage Range

1.82V Fixed Output Voltage

Synchronous Operation

Power-Save Mode

Soft-Start Capability

Input Under-Voltage Lockout (UVLO)

Thermal Shutdown and Overload Protection

6-Lead 3 x 3mm MLP

5-Bump 1 x 1.37mm WLCSP

Cell Phones, Smart-Phones

Pocket PCs

WLAN DC-DC Converter Modules

PDA, DSC, PMP, and MP3 Players

Portable Hard Disk Drives

Temperature Range

-40°C to 85°C

Operating

WLCSP-5 1x1.37mm

MLP-6 3 x 3mm

Package

Description

The FAN5350 is a step-down switching voltage

regulator that delivers a fixed 1.82V from an input

voltage supply of 2.7V to 5.5V. Using a proprietary

architecture

FAN5350 is capable of delivering 600mA at over 90%

efficiency, while maintaining a very high efficiency of

over 80% at load currents as low as 1mA. The regulator

operates at a nominal fixed frequency of 3MHz at full

load, which reduces the value of the external

components to 1µH for the output inductor and 4.7µF

for the output capacitor.

modulation is used to operate the device in power-save

mode with a typical quiescent current of 16µA. 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, operating at 3MHz. In shutdown

mode, the supply current drops below 1µA, reducing

power consumption.

The FAN5350 is available in a 6-lead Molded Leadless

Package (MLP) and a 5-bump Wafer Level Chip Scale

Package (WLCSP).

moderate

with

Eco Status

and

Green

synchronous

light

loads,

Packing Method

Tape and Reel

rectification,

pulse

www.fairchildsemi.com

frequency

June 2008

the

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FAN5350_08 Summary of contents

Page 1

FAN5350 3MHz, 600mA Step-Down DC-DC Converter in Chip-Scale and MLP Packaging Features 3MHz Fixed-Frequency Operation 16µA Typical Quiescent Current 600mA Output Current Capability 2.7V to 5.5V Input Voltage Range 1.82V Fixed Output Voltage Synchronous Operation Power-Save Mode Soft-Start Capability Input ...

Page 2

Page 3

Pin Configurations VIN Figure 4. WLCSP - Bumps Facing Down Pin Definitions WLCSP Pin # Name Description A1 V Power Supply Input GND Ground Pin. Signal and power ground for the part. ...

Page 4

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 ...

Page 5

Electrical Characteristics Minimum and maximum values are at V otherwise noted. Typical values are at T Symbol Parameter Power Supplies I Quiescent Current Q I Shutdown Supply Current (SD) V Under-Voltage Lockout Threshold UVLO V Enable HIGH-Level Input Voltage (ENH) ...

Page 6

Operation Description The FAN5350 is a step-down switching voltage regulator that delivers a fixed 1.82V from an input voltage supply of 2.7V to 5.5V. Using a proprietary architecture with synchronous rectification, the FAN5350 is capable of delivering 600mA at over ...

Page 7

Applications Information Selecting the Inductor The output inductor must meet both the required inductance and the energy handling capability of the application. The inductor value affects the average current limit, the PWM-to-PFM transition point, the output voltage ripple, and the ...

Page 8

PCB Layout Guidelines For the bill of materials of the FAN5350 evaluation board, see Table 1. There are only three external components: the inductor and the input and output capacitors. For any buck switcher IC, including the FAN5350 ...

Page 9

Typical Performance Characteristics V = 3.6V 25° 2.5 3.0 3.5 Battery Voltage (V) Figure 8. Quiescent Current vs. Battery Voltage 600 500 400 ...

Page 10

Typical Performance Characteristics V = 3.6V 25° 100 0.001 0.010 Load Current (A) Figure 14. Power Efficiency vs. Load Current 1.3 1.2 1.1 ...

Page 11

Typical Performance Characteristics V = 3.6V 25° scale: 20µs / div. Figure 20. Start-Up, Full Load H scale: 1µs / div. Figure 22. Fast Load Transient, No Load to Full ...

Page 12

Typical Performance Characteristics V = 3.6V 25° scale: 20µs / div. Figure 26. Fast Load Transient DCM – CCM – DCM scale: 10µs / div. ...

Page 13

Physical Dimensions Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or ...

Page 14

Physical Dimensions (Continued) F BALL INDEX AREA 0. TOP VIEW 0. SEATING PLANE C (X)+/-.018 0.50 0. 0.433 (Y)+/-.018 F BOTTOM VIEW Product Specific Dimensions Product FAN5350UCX ...

Page 15

Fairchild Semiconductor Corporation FAN5350 Rev. 1.0.3 15 www.fairchildsemi.com ...

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