TL7660
CMOS VOLTAGE CONVERTER
www.ti.com
SCAS794–JUNE 2006
FEATURES
APPLICATIONS
•
•
•
On-Board Negative Supplies
Data-Acquisition Systems
Portable Electronics
•
Simple Voltage Conversion, Including
– Negative Converter
– Voltage Doubler
•
•
Wide Operating Range…1.5 V to 10 V
D, DGK, OR P PACKAGE
(TOP VIEW)
Requires Only Two External (Noncritical)
Capacitors
NC
CAP+
GND
VCC
1
2
3
4
8
7
6
5
•
•
No External Diode Over Full Temperature and
Voltage Range
OSC
LV
Typical Open-Circuit Voltage Conversion
CAP−
VOUT
Efficiency…99.9%
•
•
Typical Power Efficiency…98%
NC − No internal connection
Full Testing at 3 V
DESCRIPTION/ORDERING INFORMATION
The TL7660 is a CMOS switched-capacitor voltage converter that perform supply-voltage conversions from
positive to negative. With only two noncritical external capacitors needed for the charge pump and charge
reservoir functions, an input voltage within the range from 1.5 V to 10 V is converted to a complementary
negative output voltage of –1.5 V to –10 V. The device can also be connected as a voltage doubler to generate
output voltages up to 18.6 V with a 10-V input.
The basic building blocks of the IC include a linear regulator, an RC oscillator, a voltage-level translator, and four
power MOS switches. To ensure latch-up-free operation, the circuitry automatically senses the most negative
voltage in the device and ensures that the N-channel switch source-substrate junctions are not forward biased.
The oscillator frequency runs at a nominal 10 kHz (for VCC = 5 V), but that frequency can be decreased by
adding an external capacitor to the oscillator (OSC) terminal or increased by overdriving OSC with an external
clock.
For low-voltage operation (VIN < 3.5 V), LV should be tied to GND to bypass the internal series regulator. Above
3.5 V, LV should be left floating to prevent device latchup.
The TL7660C is characterized for operation over a free-air temperature range of –40°C to 85°C. The TL7660I is
characterized for operation over a free-air temperature range of –40°C to 125°C.
ORDERING INFORMATION
TA
PACKAGE(1)
ORDERABLE PART NUMBER
TL7660CDGKT
TL7660CDGKR
TL7660CP
TOP-SIDE MARKING(2)
TM_
Reel of 250
MSOP/VSSOP – DGK
PDIP – P
Reel of 2500
Tube of 50
Tube of 75
Reel of 2500
Reel of 250
Reel of 2500
Tube of 50
Tube of 75
Reel of 2500
–40°C to 85°C
TL7660CP
7660C
TL7660CD
SOIC – D
TL7660CDR
TL7660IDGKT
TL7660IDGKR
TL7660IP
MSOP/VSSOP – DGK
PDIP – P
TN_
–40°C to 125°C
TL7660IP
7660I
TL7660ID
SOIC – D
TL7660IDR
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
(2) DGK: The actual top-side marking has one additional character that indicates the assembly/test site.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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