Fairchild FAN5602 service manual

August 2009

FAN5602 — Universal (Step-Up/Step-Down) Charge
Pump Regulated DC/DC Converter

FAN5602 — Universal (Step-Up/Step-Down) Charge Pump Regulated DC/DC Converter

Features

■

Low-Noise, Constant-Frequency Operation at Heavy Load

■

High-Efficiency, Pulse-Skip (PFM) Operation at Light Load

■ Switch Configurations (1:3, 1:2, 2:3, 1:1, 3:2, 2:1, 3:1)

■ 92% Peak Efficiency

■ Input Voltage Range: 2.7V to 5.5V

■ Output Current: 4.5V, 100mA at V

■ ±3% Output Voltage Accuracy

■ I

< 1µA in Shutdown Mode

CC

■ 1MHz Operating Frequency

■ Shutdown Isolates Output from Input

■ Soft-Start Limits Inrush Current at Startup

■ Short-Circuit and Over-Temperature Protection

■ Minimum External Component Count

■ No Inductors

= 3.6V

IN

Applications

■ Cell Phones

■ Handheld Computers

■ Portable RF Communication Equipment

■ Core Supply to Low-Power Processors

■ Low-Voltage DC Bus

■ DSP Supplies

Description

The FAN5602 is a universal switched capacitor DC/DC
converter capable of step-up or step-down operation.
Due to its unique adaptive fractional switching topology,
the device achieves high efficiency over a wider input/
output voltage range than any of its predecessors. The
FAN5602 utilizes resistance-modulated loop control,
which produces lower switching noise than other topolo­gies. Depending upon actual load conditions, the device
automatically switches between constant-frequency and
pulse-skipping modes of operation to extend battery life.

The FAN5602 produces a fixed regulated output within
the range of 2.7V to 5.5V from any type of voltage
source. High efficiency is achieved under various input/
output voltage conditions because an internal logic circuit
automatically reconfigures the system to the best possi­ble topology. Only two 1µF bucket capacitors and one
10µF output capacitor are needed. During power on,
soft-start circuitry prevents excessive current drawn from
the supply. The device is protected against short-circuit
and over-temperature conditions.

The FAN5602 is available with 4.5V and 5.0V output volt­ages in a 3x3mm 8-lead MLP package.

Ordering Information

Part Number Package Eco Status Output Voltage, N

FAM6502MP45X 3x3mm 8-Lead MLP Green 4.5V

FAN5602MP5X 3x3mm 8-Lead MLP Green 5.0V

Note:

1. Reference MLP08D Option B ONLY.

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

VOM

.

Application Diagram

Input 2.7V to 5.5V

V

IN

1

C

B

GND

C2+

C2-

2

FAN5602

3

4

C

IN

8
6

7

5

Figure 1. Typical Application Diagram

© 2005 Fairchild Semiconductor Corporation www.fairchildsemi.com

FAN5602 Rev. 1.5.3

C1+

C1-

ENABLE

C

V

OUT

OUT

Block Diagram

ENABLE

FAN5602 — Universal (Step-Up/Step-Down) Charge Pump Regulated DC/DC Converter

V

IN

C1+C1-

FB

BG

REF

V

IN

150mV

V

OUT

1.6V

V

IN

BAND GAP

SOFT-START

CURRENT
SENSE

Light load

EN

PFM

MODE

SC

UVLO

FB

ERROR
AMP

BG

Heavy Load

CONTROL LOGIC

OSCILLATOR

EN

V

IN V

DRIVER

OUT

S

W

I
T
C
H

A
R
R
A
Y

V

OUT

C2+

C2-

GND

Figure 2. Block Diagram

© 2005 Fairchild Semiconductor Corporation www.fairchildsemi.com

FAN5602 Rev. 1.5.3 2

Pin Assignments

V

IN

C2+

C2-

GND

1

2

3

4 5

8

7

6

ENABLE

C1+

V

OUT

C1-

3x3mm 8-Lead MLP

Figure 3. Pin Assignments

Pin Descriptions

Pin # Name Description

1VINSupply Voltage Input.

2 C2+ Bucket Capacitor2. Positive Connection.

3 C2- Bucket Capacitor2. Negative Connection.

4 GND Ground

5 C1- Bucket Capacitor1. Negative Connection.

6V

OUT

7 C1+ Bucket Capacitor1. Positive Connection.

8 ENABLE

Regulated Output Voltage. Bypass this pin with 10μF ceramic low-ESR capacitor.

Enable Input. Logic high enables the chip and logic low disables the chip, reducing the
supply current to less than 1µA. Do not float this pin.

FAN5602 — Universal (Step-Up/Step-Down) Charge Pump Regulated DC/DC Converter

© 2005 Fairchild Semiconductor Corporation www.fairchildsemi.com

FAN5602 Rev. 1.5.3 3

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. Unit

V

IN

P

D

T

L

T

J

T

STG

ESD

Note:

2. Using Mil Std. 883E, method 3015.7 (Human Body Model) and EIAJ/JESD22C101-A (Charged Device Model).

V

IN, VOUT,

Voltage at C1+,C1-,C2+, and C2-to GND -3.0 V

ENABLE, Voltage to GND -3.0 6.0 V

+0.3 V

IN

Power Dissipation Internally Limited

Lead Soldering Temperature (10 seconds) 300 C°

Junction Temperature 150 C°

Storage Temperature -55 150 C°

Human Body Model (HBM) 2 kV

Charged Device Model (CDM) 2 kV

FAN5602 — Universal (Step-Up/Step-Down) Charge Pump Regulated DC/DC Converter

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 Condition Min. Typ. Max. Unit

V

IN

I

L

T

A

Note:

3. Refer to Figure 9 in Typical Performance Characteristics.

Input Voltage 1.8 5.5 V

Load Current

VIN < 2V 30

4.5 & 5.5,V

= 3.6V 100

IN

mA

Ambient Temperature -40 +85 C°

© 2005 Fairchild Semiconductor Corporation www.fairchildsemi.com

FAN5602 Rev. 1.5.3 4