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FAN5601 Regulated Step-Down Charge Pump DC/DC Converter
July 2005
FAN5601
Regulated Step-Down Charge Pump DC/DC Converter
Features
■
> 85% Peak Efficiency
■
Low EMI
■
Low Ripple
■
■
■
■
Output Voltage 1.3V/1.8V
Input Voltage Range: 2.2V to 5.5V
Output Current: Up to 250mA
±2.5% Output Voltage Accuracy
Description
The FAN5601 is an advanced third generation switched capaci-
tor step down DC/DC converter utilizing Fairchild’s proprietary
ScalarPump™ technology. This innovative architecture utilizes
scalar switch re-configuration and fractional switching tech-
niques to produce low output ripple, low ESR spikes and
improve efficiency over a wide load range.
The FAN5601 produces a fixed regulated output from 2.2V to
5V input voltage. Customized output voltages are available in
100mV increments from 1V to 1.8V. Contact marketing for cus-
tomized outputs.
In order to maximize efficiency, the FAN5601 achieves
regulation by skipping pulses. Depending upon load current, the
size of the switches is scaled dynamically, consequently, current
spikes and EMI are minimized. An internal soft start circuitry
prevents excessive current drawn from the supply. The device is
internally protected against short circuit and over temperature
conditions.
The FAN5601 is available in 6-lead 3x3mm MLP.
ScalarPump
™
is a registered trademark of Fairchild Semiconductor Corporation.
■
30
µ
A Operating Current
■
I
CC
< 1
µ
A in Shutdown Mode
■
2MHz Operating Frequency
■
Shutdown Isolates Output from Input
■
Soft-Start Limits Inrush Current
■
Short Circuit and Over Temperature Protection
■
Minimum External Component Count
■
6-Lead 3x3mm MLP Package
Applications
■
■
■
■
■
■
■
Cell Phones
Handheld Computers
Portable Electronic Equipment
Core Supply to Next Generation Processors
Low Voltage DC Bus
Digital Cameras
DSP Supplies
Typical Application
C
B
= 1µF
V
IN
C
IN
= 10µF
FAN5601
INPUT 2.2V to 5.5V
C+
C-
V
OUT
OUTPUT 1.0V t o 1.8V
ENABLE GND
C
OUT
= 10µF
©2005 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
FAN5601 Rev. 1.0.5
FAN5601 Regulated Step-Down Charge Pump DC/DC Converter
Pin Assignment
FAN5601
Top-View
C+
C-
ENABLE
1
2
3
6
5
4
V
IN
V
OUT
GND
6-Lead 3x3mm MLP
Pin Description
Pin Name
Pin No.
1
2
3
4
5
6
6-Lead 3x3mm MLP
C+
C-
ENABLE
GND
V
OUT
V
IN
Pin Function Description
Bucket Capacitor Positive Connection
Bucket Capacitor Negative Connection
Enable Pin
Ground
Regulated Output Voltage. Bypass this pin with 10µF ceramic low ESR capacitor.
Supply Voltage Input
2
FAN5601 Rev. 1.0.5
www.fairchildsemi.com
FAN5601 Regulated Step-Down Charge Pump DC/DC Converter
Absolute Maximum Ratings
(Note1)
Parameter
V
IN
,V
OUT
, ENABLE to GND
C+, C-, to GND
V
OUT
Short Circuit Duration
Lead Soldering Temperature (10 seconds)
Operating Temperature Range
Junction Temperature
Storage Temperature
Electrostatic Discharge (ESD) Protection (Note2)
HBM
CDM
-55
4
1
-40
Min
-0.3
-0.3
Max
6.0
V
IN
+ 0.3
INDEFINITE
300
+85
150
150
Unit
V
V
°C
°C
°C
°C
kV
Recommended Operating Conditions
Parameter
Input Voltage
Output Current
Operating Ambient Temperature
Thermal Resistance Junction to Tab
Thermal Resistance Junction to Ambient
6-lead 3x3mm MLP
6-lead 3x3mm MLP (Note 3)
-40
8
90
Package
Min
2.2
Typ
Max
5.5
250
85
Unit
V
mA
°C
°C/W
°C/W
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. One square inch, 1oz bottom side GND plane connected to top side GND plane by field of via.
3
FAN5601 Rev. 1.0.5
www.fairchildsemi.com
FAN5601 Regulated Step-Down Charge Pump DC/DC Converter
Electrical Characteristics
V
IN
= 2.2V to 5.5V, I
OUT
= 1mA, C
B
= 1µF, C
IN
= 10µF, C
OUT
= 10µF, T
A
= -40°C to +85°C, typical values
measured at T
A
= 25°C, unless otherwise noted.
Parameter
Input Undervoltage Lockout
Output Voltage
Output Voltage Accuracy
T
A
= 25°C, V
IN
= 3.3V
V
IN
= 3.3V
Output Voltage Temperature Coefficient
Load Regulation
Line Regulation
No load Supply Current (Note 4)
Shutdown Supply Current
Output Short-circuit Current (Note 5)
Efficiency
V
IN
at Configuration Change
Oscillator Frequency
Thermal Shutdown Threshold
Thermal Shutdown Threshold Hysteresis
ENABLE Logic Input High Voltage, V
IH
ENABLE Logic Input Low Voltage, V
IL
ENABLE Logic Input Current
V
OUT
Turn On Time
V
IN
= 2.2V to 5.5V
V
IN
= 2.2V to 5.5V
ENABLE = V
IN
or GND
V
IN
= 3.6V, I
OUT
= 0mA,
10% to 90%
-1
1
1.3
0.4
1
T
A
= 25°C
I
OUT
= 0mA,
V
IN
= 2.2V
ENABLE =GND.
V
OUT
= 0
V
OUT
= GND.
V
IN
= 2.35
×
V
OUT
I
OUT
=150mA
From 2:1 to 1:1 mode
V
IN
= 3.3V
-2
-2.5
25
0.133
1.35
30
0.1
25
85
2.22 x Vnom
2.0
150
15
2
60
1
Conditions
Min.
1.9
Typ.
2.0
Vnom
Max.
2.17
Units
V
V
+2
+2.5
%
%
ppm
mV/mA
mV/V
µ
A
µ
A
mA
%
V
MHz
°
C
°
C
V
V
µ
A
mS
Notes:
4. No load supply current is measured when the oscillator is off.
5. The short circuit protection is designed to protect against pre-existing short circuit conditions, i.e. assembly shorts
that exist prior to device power-up. The short circuit current limit is 25mA
Average
. Short circuit currents in normal
operation are inherently limited by the ON-resistance of internal device. Since this resistance is in the range of 1
Ω
,
in some cases thermal shutdown may occur. However, immediately following the first thermal shutdown event, the
short circuit condition will be treated as pre-existing, and the load current will reduce to 25mA
Average
.
4
FAN5601 Rev. 1.0.5
www.fairchildsemi.com
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