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PDF FAN5601 Datasheet ( Hoja de datos )

Número de pieza FAN5601
Descripción Regulated Step-Down Charge Pump DC/DC Converter
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo

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FAN5601 Hoja de datos, Descripción, Manual
July 2005
www.DataSheet4U.com
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
30µA Operating Current
ICC < 1µA 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
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.
ScalarPumpis a registered trademark of Fairchild Semiconductor Corporation.
CB = 1µF
INPUT 2.2V to 5.5V
CIN = 10µF
C+
VIN
C- OUTPUT 1.0V t o 1.8V
VOUT
ENABLE GND
COUT = 10µF
©2005 Fairchild Semiconductor Corporation
FAN5601 Rev. 1.0.5
1
www.fairchildsemi.com

1 page

FAN5601 pdf
Typical Performance Characteristics
TA = 25°C, CIN = COUT =10µF, CB = 1µF, VOUT = 1.3V, unless otherwise noted.
Line Transient Response
Load Transient Response
VIN = 4.4V
VIN = 2V
VIN = 2 V to 4.4V
IOUT = 10mA
Time (10µs/div)
46
44
42
40
38
36
34
32
30
28
2.0
Input Current vs Input Voltage
IOUT = 0mA
2.5 3.0 3.5 4.0 4.5 5.0
Input Voltage (V)
5.5
Output Voltage vs Ambient Temperature
1.31
1.30
1.29
1.28
VIN = 4V
IOUT = 10mA
1.27
1.26
-60 -40 -20 0 20 40 60 80 100 120 140
Ambient Temperature (°C)
VIN = 3.3V
IOUT = 100mA
IOUT = 1mA
Time (1ms/div)
Shutdown Current vs Input Voltage
70
VOUT = 0V
60
50
40
30
20
10
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Mode Change Threshold and Hysteresis
vs Load Current
3. 5
3. 0
2. 5
Low Threshold
2. 0
High Threshold
1. 5
1.0 Hysteresis
0. 5
0. 0
0
20 40 60 80 100 120 140 160
Load Current (mA)
5 www.fairchildsemi.com
FAN5601 Rev. 1.0.5

5 Page

FAN5601 arduino
Shutdown, UVLO, Short Circuit Current Limit
and Thermal Shutdown
The device has an active-low shutdown pin to decrease supply
current to less than 1µA. In shutdown mode the supply is dis-
Switch Configuration
VIN
connected from the output. UVLO triggers when supply voltage
drops below 2V. When the output voltage is lower than 150mV, a
short circuit protection is triggered. In this mode 15 out of 16
pulses during the switching will be skipped and the supply cur-
rent is limited. Thermal shutdown triggers at 150°C.
VIN
S1
C+
S2
VOUT
C
B
S3
C-
S4
C
OUT
S1
C+
S2
VOUT
S3
C-
CB
S4
C
OUT
GND
Figure 2. (A)
2:1 configuration
Switches in charging phase
Reverse all switches for pumping phase
GND
Figure 2. (B)
1:1 configuration
Switch 3 is always off and
Switch 4 is always on
Switches 1 and 2 are in phase 1
Reverse the position of switches 1&2
for phase 2
Applications Information
Proper operation of the FAN5601 requires one ceramic bucket
capacitor in the 0.1µF to 1µF range; one 10µF output bypass
capacitor and one 10µF input bypass capacitor. In order to
obtain optimum output ripple and noise performance, use of low
ESR (<0.05) ceramic input and output bypass capacitors is
recommended. The X5R and X7R rated capacitors provide ade-
quate performance over the -40°C to 85°C temperature range.
The value of the bucket capacitor is dependent on load current
requirements. A 1µF bucket capacitor will work well in all appli-
cations at all load currents, while a 0.1µF capacitor will support
most applications under 100mA of load current. The choice of
bucket capacitor values should be verified in the actual applica-
tion at the lowest input voltage and highest load current. A 30%
margin of safety is recommended in order to account for the tol-
erance of the bucket capacitor and the variations in the on-resis-
tance of the internal switches.
11 www.fairchildsemi.com
FAN5601 Rev. 1.0.5

11 Page


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