FAN5602 — Universal (Step-Up/Step-Down) Charge Pump Regulated DC/DC Converter
August 2009
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
IN
= 3.6V
■
±3% Output Voltage Accuracy
■
I
CC
< 1µA in Shutdown Mode
■
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
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 topolo-
gies. 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 possi-
ble 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 volt-
ages in a 3x3mm 8-lead MLP package.
Applications
■
Cell Phones
■
Handheld Computers
■
Portable RF Communication Equipment
■
Core Supply to Low-Power Processors
■
Low-Voltage DC Bus
■
DSP Supplies
Ordering Information
Part Number
FAM6502MP45X
FAN5602MP5X
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.
Package
3x3mm 8-Lead MLP
3x3mm 8-Lead MLP
Eco Status
Green
Green
Output Voltage, N
VOM
4.5V
5.0V
Application Diagram
Input 2.7V to 5.5V
V
IN
ENABLE
1
C
IN
C
B
C2-
C2+
2
3
4
FAN5602
8
6
7
5
C1+
V
OUT
C
OUT
GND
C1-
Figure 1. Typical Application Diagram
© 2005 Fairchild Semiconductor Corporation
FAN5602 Rev. 1.5.3
www.fairchildsemi.com
FAN5602 — Universal (Step-Up/Step-Down) Charge Pump Regulated DC/DC Converter
Pin Assignments
V
IN
C2+
C2-
GND
1
2
3
4
8
7
6
5
ENABLE
C1+
V
OUT
C1-
3x3mm 8-Lead MLP
Figure 3. Pin Assignments
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
Name
V
IN
C2+
C2-
GND
C1-
V
OUT
C1+
ENABLE
Supply Voltage Input.
Description
Bucket Capacitor2. Positive Connection.
Bucket Capacitor2. Negative Connection.
Ground
Bucket Capacitor1. Negative Connection.
Regulated Output Voltage. Bypass this pin with 10μF ceramic low-ESR capacitor.
Bucket Capacitor1. Positive Connection.
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.
© 2005 Fairchild Semiconductor Corporation
FAN5602 Rev. 1.5.3
www.fairchildsemi.com
3
FAN5602 — Universal (Step-Up/Step-Down) Charge Pump Regulated DC/DC Converter
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only.
Symbol
V
IN
P
D
T
L
T
J
T
STG
ESD
Parameter
V
IN,
V
OUT,
ENABLE, Voltage to GND
Voltage at C1+,C1-,C2+, and C2-to GND
Power Dissipation
Lead Soldering Temperature (10 seconds)
Junction Temperature
Storage Temperature
Human Body Model (HBM)
Charged Device Model (CDM)
Min.
-3.0
-3.0
Max.
6.0
V
IN
+0.3
Internally Limited
300
150
Unit
V
V
C°
C°
C°
kV
kV
-55
150
2
2
Note:
2. Using Mil Std. 883E, method 3015.7 (Human Body Model) and EIAJ/JESD22C101-A (Charged Device Model).
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
V
IN
I
L
T
A
Parameter
Input Voltage
Load Current
Ambient Temperature
V
IN
< 2V
Condition
Min.
1.8
Typ.
Max.
5.5
30
100
Unit
V
mA
C°
4.5 & 5.5,V
IN
= 3.6V
-40
+85
Note:
3. Refer to Figure 9 in Typical Performance Characteristics.
© 2005 Fairchild Semiconductor Corporation
FAN5602 Rev. 1.5.3
www.fairchildsemi.com
4
Analog electronics
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