www.fairchildsemi.com
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
• Adaptive Seven 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:3.3V, 200mA 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 Start-up
• Short Circuit and Over Temperature Protection
• Minimum External Component Count
• No Inductors
Description
The FAN5602 is a universal switched capacitor DC/DC con-
verter 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 (PFM)
modes of operation in order 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 effi-
ciency is achieved under any input/output voltage conditions
because an internal logic circuitry 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 cur-
rent drawn from the supply. The device is protected against
short circuit and over temperature conditions.
The FAN5602 is available with 3.3V, 4.5V, and 5.0V output
voltage. Any other output voltage option within the 1.5V to
5V range is available upon request. The FAN5602 is avail-
able in 8-lead MSOP and 3x3mm 8-lead MLP packages
Applications
•
•
•
•
•
•
Cell Phones
Handheld Computers
Portable RF Communication Equipment
Core Supply to Low Power Processors
Low Voltage DC Bus
DSP Supplies
Typical Application
Input 2.7V to 5.5V
V
IN
1
C
IN
C
B
C2-
C2+
ENABLE
2
3
4
FAN5602
8
6
7
5
C1+
V
OUT
C
OUT
GND
C1-
REV. 1.1 10/7/04
FAN5602
PRODUCT SPECIFICATION
Pin Assignment
TOP VIEW
V
IN
C2+
C2-
GND
1
2
3
4
8
7
6
5
ENABLE
C1+
V
OUT
C1-
V
IN
C2+
C2-
GND
ENABLE
C1+
V
OUT
C1-
3x3mm 8-Lead MLP
FAN5602
8-Lead MSOP
Pin Description
Pin No.
1
2
3
4
5
6
7
8
Pin Name
V
IN
C2+
C2-
GND
C1-
V
OUT
C1+
ENABLE
Supply Voltage Input
Bucket Capacitor2 Positive Connection
Bucket Capacitor2 Negative Connection
Ground
Bucket Capacitor1 Negative Connection
Regulated Output Voltage. Bypass this pin with 10
µ
F 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.
Pin Description
2
REV. 1.1 10/7/04
PRODUCT SPECIFICATION
FAN5602
Absolute Maximum Ratings
(Note 1)
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
Electrostatic Discharge (ESD) Protection (Note 2)
HBM
CDM
-55
2
2
Min
-0.3
-0.3
Typ
Max
6.0
V
IN
+ 0.3
Internally
Limited
300
150
150
°C
°C
°C
kV
Unit
V
V
Recommended Operating Conditions
Parameter
Input Voltage
Load Current (Note 3)
V
IN
< 2V
3.3V, V
IN
= 3.6V
4.5 & 5.0V, V
IN
= 3.6V
Ambient Temperature
-40
Conditions
Min
1.8
Typ
Max
5.5
30
200
100
85
Unit
V
mA
mA
mA
°C
Notes
:
1. Operation beyond the absolute maximum rating may cause permanent damage to device.
2. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
3. Refer to “load Current Capability vs Input Voltage” in “Typical Performance Characteristics”.
REV. 1.1 10/7/04
3
FAN5602
PRODUCT SPECIFICATION
DC Electrical Characteristics
V
IN
= 2.7V to 5.5V, C
1
= C
2
= 1µF, C
IN
= C
OUT
= 10µF, ENABLE = V
IN
, T
A
= -40 °C to +85 °C unless otherwise
noted. Typical values are at T
A
= 25°C.
Parameter
Input Undervoltage Lockout
Output Voltage, V
OUT
Quiescent Current
V
IN
≥
0.75 x V
NOM
,
0mA < I
LOAD
< 100mA
V
IN
≥
1.1 x V
NOM
,
I
LOAD
= 0mA
Conditions
Min.
1.5
Typ.
1.7
Max.
2.2
Units
V
V
µA
0.97 x V
NOM
V
NOM
1.03 x V
NOM
100
300
Off Mode Supply Current
Output Short-circuit Current
Efficiency
ENABLE = GND
V
OUT
< 150mV
V
IN
= 0.85 x V
NOM
,
I
LOAD
= 30mA
V
IN
= 1.1 x V
NOM
,
I
LOAD
= 30mA
3.3V
4.5V, 5.0V
3.3V
4.5V, 5.0V
0.7
0.1
1
200
µ
A
mA
%
%
75
80
90
92
1.0
145
15
1.5
0.5
1.3
Oscillator Frequency
Thermal Shutdown Threshold
Thermal Shutdown Threshold
Hysteresis
ENABLE Logic Input High
Voltage, V
IH
ENABLE Logic Input Low
Voltage, V
IL
ENABLE Input Bias Current
V
OUT
Turn On Time
T
A
= 25°C
MHz
°C
°C
V
V
µ
A
mS
ENABLE = V
IN
or GND
V
IN
= 0.9 x V
NOM
,
I
LOAD
=0mA,
10% to 90%
V
IN
= 2.5V
I
LOAD
= 200mA
-1
0.5
1
V
OUT
Ripple
10
mVpp
4
REV. 1.1 10/7/04
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