Fairchild FAN4860 service manual

November 2010

FAN4860

3MHz, Synchronous TinyBoost™ Regulator

FAN4860 — 3MHz, Synchronous TinyBoost™ Regulator

Features

Operates with Very Small External Components:



1μH Inductor and 0402 Case Size Input and Output Capacitors

 Input Voltage Range from 2.3V to 4.5V  Fixed 3.3V or 5.0V Output Voltage Options  Maximum Load Current >200mA at V  Maximum Load Current 300mA at V  Maximum Load Current 300mA at V

=2.3V

IN

=3.3V, V

IN

=2.7V, V

IN

OUT

=5V

=3.3V

 Up to 92% Efficient  Low Operating Quiescent Current  True Load Disconnect During Shutdown  Variable On-time Pulse Frequency Modulation (PFM) with

Light-Load Power-Saving Mode

 Internal Synchronous Rectifier

(No External Diode Needed)

 Thermal Shutdown and Overload Protection  6-Pin 2 x 2mm UMLP  6-Bump WLCSP, 0.4mm Pitch

Applications

Description

The FAN4860 is a low-power boost regulator designed to provide a regulated 3.3V or 5V output from a single cell Lithium or Li-Ion battery. Output voltage options are fixed at either 3.3V or 5.0V with a guaranteed maximum load current of 200mA at V in shut-down mode is less than 1µA, which maximizes battery life.

Light-load PFM operation is automatic and “glitch-free”. The regulator maintains output regulation at no-load with as low as 37µA quiescent current.

The combination of built-in power transistors, synchronous rectification, and low supply current make the FAN4860 ideal for battery powered applications.

The FAN4860 is available in 6-bump 0.4mm pitch WaferLevel Chip Scale Package (WLCSP) and a 6-lead 2x2mm ultra-thin MLP package.

=2.3V and 300mA at VIN=3.3V. Input current

IN

 USB “On the Go” 5V Supply  5V Supply – HDMI, H-Bridge Motor Drivers  Powering 3.3V Core Rails  PDAs, Portable Media Players

Figure 1. Typical Application

 Cell Phones, Smart Phones, Portable Instruments

Ordering Information

Part Number Operating Temperature Range Package Packing Method

FAN4860UC5X -40°C to 85°C WLCSP, 0.4mm Pitch Tape and Reel

FAN4860UMP5X -40°C to 85°C UMLP-6, 2 x 2mm Tape and Reel

FAN4860UC33X -40°C to 85°C WLCSP, 0.4mm Pitch Tape and Reel

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

Block Diagrams

Figure 2. IC Block Diagram

FAN4860 — 3MHz, Synchronous TinyBoost™ Regulator

Pin Configuration

Figure 3. WLCSP (Top View) Figure 4. WLCSP (Bottom View) Figure 5. 2X2mm UMLP (Top View)

Pin Definitions

Pin #

WLCSP UMLP

A1 6 VIN

B1 5 SW

C1 4 EN

C2 3 FB

B2 2 VOUT

A2 1, P1 GND

Name Description

Input Voltage. Connect to Li-Ion battery input power source and input capacitor (C Switching Node. Connect to inductor. Enable. When this pin is HIGH, the circuit is enabled. This pin should not be left floating. Feedback. Output voltage sense point for V Output Voltage. This pin is both the output voltage terminal as well as an IC bias supply. Ground. Power and signal ground reference for the IC. All voltages are measured with

respect to this pin.

. Connect to output capacitor (C

OUT

).

IN

).

FAN4860 — 3MHz, Synchronous TinyBoost™ Regulator

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 VIN Pin -0.3 5.5 V

V

VOUT Pin –2 6 V

OUT

VFB FB Pin –2 14 V

VSW SW Node

VEN EN Pin -0.3 5.5 V

ESD

TJ Junction Temperature –40 +150 °C

T

STG

TL Lead Soldering Temperature, 10 Seconds +260 °C

Electrostatic Discharge Protection Level

Storage Temperature –65 +150 °C

DC

Transient: 10ns, 3MHz -1.0 6.5

Human Body Model per JESD22-A114 2

Charged Device Model per JESD22-C101 1

-0.3 5.5 V

kV

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

VIN Supply Voltage

I

Output Current 200 mA

OUT

TA Ambient Temperature –40 +85 °C

TJ Junction Temperature –40 +125 °C

5.0 V

3.3 V

2.3 4.5 V

OUT

2.5 3.2 V

OUT

Thermal Properties

Junction-to-ambient thermal resistance is a function of application and board layout. This data is measured with four-layer 2s2p boards in accordance to JEDEC standard JESD51. Special attention must be paid not to exceed junction temperature

at a given ambient temperate TA.

T

J(max)

Symbol Parameter Typical Units

θJA

Junction-to-Ambient Thermal Resistance

WLCSP 130 °C/W

UMLP 57 °C/W

FAN4860 — 3MHz, Synchronous TinyBoost™ Regulator

Electrical Specifications

Minimum and maximum values are at VIN=VEN=2.3V to 4.5V (2.5 to 3.2 VIN for 3.3 V Figure 1, unless otherwise noted. Typical values are at T

=25°C, VIN=VEN=3.6V for V

A

Symbol Parameter Conditions Min. Typ. Max. Units

5.0 V

OUT

IIN VIN Input Current

3.3 V

OUT

I

V

LK_OUT

I

LK_RVSR

V

Under-Voltage Lockout VIN Rising 2.2 2.3 V

UVLO

V

UVLO_HYS

V

Enable HIGH Voltage 1.05 V

ENH

V

Enable LOW Voltage 0.4 V

ENL

I

Enable Input Leakage Current 0.01 1

LK_EN

Leakage Current V

OUT

V

to VIN Reverse Leakage

OUT

Under-Voltage Lockout Hysteresis 190 mV

Quiescent: V

Shutdown: EN=0, VIN=3.6V 0.5 1.5

Quiescent: V

Shutdown: EN=0, VIN=2.7V 0.5 1.5

=0, EN=0, VIN≥3V 10 nA

OUT

V

=5V, VIN=3.6V, EN=0

OUT

V

=3.3V, VIN=3V, EN=0

OUT

VIN from 2.3V to 4.5V, I

(1)

VIN from 2.7V to 4.5V, I

VIN from 3.3V to 4.5V, I

(1)

VIN from 2.5V to 3.2V, I

Referred to V

=3.6V, V

V

IN

VIN=2.7V, V

V

=2.3V 200

IN

OUT

VIN=3.3V 300

VIN=3.6V 400

V

=2.5V 250

IN

OUT

VIN=2.7V 300

VIN=3.6V, V

VIN=2.7V, V

VIN=3.6V, V

VIN=2.7V, V

VIN=3.6V, I

VIN=2.7V, I

=3.6V 300

IN

=10mA 150 °C

LOAD

OUT

5.0 V

V

3.3 V

V

Reference Accuracy

REF

t

Off Time

OFF

I

OUT

Maximum Output Current

Output Voltage Accuracy

OUT

Output Voltage Accuracy

OUT

(2)

ISW SW Peak Current Limit

ISS

tSS Soft-Start Time

R

DS(ON)

T

TSD_HYS

Soft-Start Input Peak Current Limit

N-Channel Boost Switch V

P-Channel Sync Rectifier VIN=3.6V 400

Thermal Shutdown I

TSD

(2)

(3)

Thermal Shutdown Hysteresis 30 °C

5.0 V

3.3 V

5.0 V

3.3 V

5.0 V

3.3 V

5.0 V

3.3 V

=3.6V, I

IN

=2.7V, I

IN

=5V 4.975 5.050 5.125

OUT

=3.3V 3.280 3.330 3.380

OUT

=5V, I

OUT

=3.3V, I

OUT

OUT>VIN

< VIN 850

OUT

< VIN 700

OUT

=200mA 100 300

OUT

=200mA 250 750

OUT

=0, EN=V

OUT

=0, EN=V

OUT

≤200mA 4.80 5.05 5.15

OUT

≤200mA 4.85 5.05 5.15

OUT

≤300mA 4.85 5.05 5.15

OUT

≤200mA 3.17 3.33 3.41

OUT

=200mA 195 240 265

OUT

=200mA 240 290 350

OUT

930 1100 1320

650 800 950

Notes:

1. I

from 0 to I

LOAD

; also includes load transient response. V

OUT

Effective capacitance of C

> 1.5μF.

OUT

measured from mid-point of output voltage ripple.

OUT

2. Guaranteed by design and characterization; not tested in production.

3. Elapsed time from rising EN until regulated V

OUT.

option), TA=-40°C to +85°C; circuit of

OUT

=5V, and VIN=VEN=2.7V for V

OUT

37 45

IN

50 65

IN

OUT

2.5

=3.3V.

μA

V

ns

mA

μs

mΩ

FAN4860 — 3MHz, Synchronous TinyBoost™ Regulator

5.0 V

Typical Characteristics

OUT

Unless otherwise specified, circuit per Figure 1, 3.6VIN, TA=25°C.

100

95

90

85

Efficiency (%)

80

75

0 50 100 150 200 250 300

Load Current (mA)

2.5 Vin

3.3 Vin

3.6 Vin

4.5 Vin

Figure 6. Efficiency vs. VIN Figure 7. Efficiency vs. Temperature, 3.6VIN

50

25

0

-25

2.5 Vin

3.3 Vin

3.6 Vin

4.5 Vin

95

92

89

Efficiency (%)

86

83

80

0 50 100 150 200 250 300

Load Current (mA)

50

25

0

-25

-40C

+25C

+85C

-40C

+25C

+85C

-50

VOUT - 5.05V (mV)

-75

-100 0 50 100 150 200 250 300

Load Current (mA)

Figure 8. Line and Load Regulation Figure 9. Load Regulation vs. Temperature, 3.6V

4000

3200

2400

1600

Frequency (KHz)

800

0

0 50 100 150 200 250 300

Load Current (mA)

Figure 10. Switching Frequency Figure 11. Quiescent Current

2.5 Vin

3.6 Vin

4.5 Vin

-50

VOUT - 5.05V (mV)

-75

-100 0 50 100 150 200 250 300

Load Current (mA)

IN

50

45

40

35

Quiescent Current (uA)

30

25

2.0 2.5 3.0 3.5 4.0 4.5 5.0

Input Voltage(V)

-40C

+25C

+85C

FAN4860 — 3MHz, Synchronous TinyBoost™ Regulator

5.0 V

Unless otherwise specified, circuit per Figure 1, 3.6VIN, TA=25°C.

Typical Characteristics

OUT

Figure 12. Maximum DC Load Current Figure 13. Peak Inductor Current

Figure 14. Output Ripple, 10mA PFM Load Figure 15. Output Ripple, 200mA PWM Load

Figure 16. 0-50mA Load Transient, 100ns Step Figure 17. 50-200mA Load Transient, 100ns Step