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PDF FAN5660 Data sheet ( Hoja de datos )
| Número de pieza | FAN5660 | |
| Descripción | Monolithic Inductorless CMOS DC/DC Converter | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.fairchildsemi.com
FAN5660
Monolithic Inductorless CMOS DC/DC Converter
Features
• Inverts, Doubles or Splits Input Supply Voltage
• 90% Typ Conversion Efficiency at 100mA load current
• 0.5V Typ Loss at 100mA Load
• Low 160µA Operating Current
• 5.0Ω Typ Output Resistance for C1 = C2 = 100µF
• Selectable Oscillator Frequency: 5kHz/50kHz
• 8-pin SOIC package.
Applications
• Laptop Computers
• Medical Instruments
• Interface Power Supplies
• Hand-Held Instruments
• Operational-Amplifier Power Supplies
General Description
The FAN5660 is a monolithic charge-pump which can
invert, double or split a +1.5V to +5.5V input voltage.
Using only two identical low-cost capacitors, the charge
pump replaces switching regulators, thus eliminating
inductors and their associated cost, size, and EMI. The
device has a greater than 90% efficiency over most of its load
current range and a typical operating current of only 160µA.
The FAN5660 is ideal for both battery-powered and board-
level voltage conversion applications.
In order to enable the user optimize capacitor size and
quiescent current, the FAN5660 is offered with a frequency
control (FC) pin which selects either 5kHz or 50kHz
operation.
The Oscillator frequency can also be driven with an external
clock. The FAN5660 is available in 8-pin small-outline
packages.
Simplified Block Diagram
VSS
CAP+
CAP–
V+
SYNC
CONTROL
OSCILLATOR
VSH
LV
FC
REV. 1.0.2 3/28/02
1 page  
FAN5660
Typical Applications Diagrams
Unless otherwise specified TA=25°C,V+=5V, C1=C2=100µF, Iload=0, FC and LV open, using circuit in Figure 1
Supply Current vs. Supply Voltage
1.2
1.0
FC = V+
0.8
0.6 FC = V+,
LV = GND
0.4
0.2
LV to
GND
0
1
2
FC and LV open
34
Supply Voltage (V)
5
6
Supply Current vs. Oscillator Frequency
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1 10
Oscillator frequency (kHz)
100
Oscillator Frequency vs.
Supply Voltage, FC to V+
60
LV to GND
55
50
45
40
1.5 2 2.5 3 3.5 4 4.5 5 5.5
Supply Voltage (V)
Oscillator Frequency vs. Supply Voltage
7
6
5
4
LV to
GND
3
1.5 2 2.5 3 3.5 4 4.5 5 5.5
Supply Voltage (V)
Efficiency vs. Operating Frequency
100
Iload = 10mA
90
Iload = 80mA
80
70
60
1
Iload = 1mA
10
Operating Frequency (kHz)
100
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0
Efficiency vs. Load Current
V+ = 1.5V
V+ = 5.5V
V+ = 4.5V
V+ = 3.5V
V+ = 2.5V
20 40 60 80 100 120
Load Current (mA)
REV. 1.0.2 3/28/02
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet FAN5660.PDF ] | |
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