GS7660 Datasheet PDF - Vishay Siliconix
Part Number | GS7660 | |
Description | Switched-Capacitor Voltage Converter | |
Manufacturers | Vishay Siliconix | |
Logo | ||
There is a preview and GS7660 download ( pdf file ) link at the bottom of this page. Total 9 Pages |
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Vishay
formerly General Semiconductor
Switched-Capacitor Voltage Converter
8 Pin Dip
SO-8
Features
• Low output impedance ( typical 35Ω at VIN = 5V )
• Low quiescent current ( typical 36µA at VIN = 5V)
• High power conversion efficiency ( typical 98% )
• Simple and accurate voltage conversion from
positive to negative polarities
• Improved latch-up protection
• No external diodes required
Applications
• – 5V supply from + 5V logic supply
• EIA/TIA – 232E and EIA/TIA – 562 power supplies
• Portable telephones
• Data acquisition systems
• Personal communications equipment
• Panel meters
• Handheld instruments
Description
The GS7660 is a monolithic CMOS switched capacitor
voltage converter, designed to be an improved direct
replacement of the popular ICL7660, MAX1044 and
LTC1044. They perform supply voltage conversions from
positive to negative for an input voltage range of +1.5V to
+6.0V to their negative complements of –1.5V to –6.0V.
The input voltage can also be doubled (VOUT = 2VIN),
halved (VOUT = VIN/2), or multiplied (VOUT = ± n.VIN).
Contained on the chip are a series Power Supply regula-
tor, Oscillator, control Circuitry and four Power MOS
Switches. The oscillator, when unloaded, oscillates at a
nominal frequency of 10 kHz, with an Input voltage of 5.0V.
This frequency can be lowered by the addition of an external
capacitor to the “Osc” terminal or overdriven by an external
frequency source.
An Oscillator “boost” function is available to increase the
oscillator frequency which will optimize performance of
certain parameters. The Lv input can be connected to
ground to improve low voltage operation (VIN ≤ 3V), or left
open for input voltages greater than 3V to reduce power
dissipation.
The GS7660 provides superior performance over earlier
designs by combining low output impedance and low qui-
escent current with high efficiency and by eliminating diode
voltage drop losses. The only external components
required are two low cost electrolytic capacitors.
Typical Application Circuit
VIN (1.5V to 6V)
10µF +
C1
15
26
GS7660
37
Required for
VIN 3V
4 8 VOUT = --VIN
10µF
+ C2
Negative Voltage Converter
Document Number 74819
24-May-02
www.vishay.com
1
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GS7660
Vishay
formerly General Semiconductor
Pin Description
Pin Name
Function
BOOST Frequency Boost. Connecting BOOST to VIN increases the oscillator frequency by a factor of five.
1 When the oscillator is driven externally, BOOST has no effect and should be left open.
N.C.
No Connection
2
CAP+
Connection to positive terminal of Charge-Pump Capacitor
3
GND
Ground. For most applications, the positive terminal of the reservoir capacitor is connected to this pin.
4
CAP–
Connection to negative terminal of Charge-Pump Capacitor
5
VOUT
Negative Voltage Output. For most applications, the negative terminal of the reservoir capacitor is
connected to this pin.
6 LV Low-Voltage Operation. Connect to ground for supply voltages below 3.5V.
7
OSC
Oscillator Control Input. Connecting an external capacitor reduces the oscillator frequency.
8 VIN Power Supply Positive Voltage Input. (1.5V to 6V). VIN is also the substrate connection.
Detailed Description
The GS7660 is a charge-pump voltage converter. The
basic operations is as follows: Switch pairs S1, S2 and S3,
S4 (Fig.7) are alternately closed and opened at the rate of
the oscillator frequency divided by two.
During the first half of the cycle, when S1 and S2 are
closed and S3 and S4 are open, bucket capacitor C1 is
charged by input voltage. During the second half of the
cycle, when the switches assume the opposite state,
capacitor C1 is connected in parallel with output capacitor
C2 and any voltage differential causes a transfer of charge
from C1 to C2. This process will continue until the voltage
across C2 equals the –VIN voltage.
In normal operation, the output voltage will be less than
–VIN, since the switches have internal resistance and C2 is
being discharged by the load.
S1
VIN
S2
C1
S3 S4
C2
VOUT = -(VIN)
Fig. 7 – Ideal Voltage Inverter
Document Number 74819
24-May-02
www.vishay.com
5
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for GS7660 electronic component. |
Information | Total 9 Pages | |
Link URL | [ Copy URL to Clipboard ] | |
Download | [ GS7660.PDF Datasheet ] |
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