TL7660_14 Datasheet, PDF (1/23 Pages) Texas Instruments – CMOS VOLTAGE CONVERTER

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FEATURES
• Simple Voltage Conversion, Including
– Negative Converter
– Voltage Doubler
• Wide Operating Range…1.5 V to 10 V
• Requires Only Two External (Noncritical)
Capacitors
• No External Diode Over Full Temperature and
Voltage Range
• Typical Open-Circuit Voltage Conversion
Efficiency…99.9%
• Typical Power Efficiency…98%
• Full Testing at 3 V
TL7660
CMOS VOLTAGE CONVERTER
SCAS794 – JUNE 2006
APPLICATIONS
• On-Board Negative Supplies
• Data-Acquisition Systems
• Portable Electronics
D, DGK, OR P PACKAGE
(TOP VIEW)
NC 1
CAP+ 2
GND 3
CAP− 4
8
V
CC
7 OSC
6 LV
5
V
OUT
NC − No internal connection
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 V_CC = 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 (V_IN < 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.
T_A
–40°C to 85°C
–40°C to 125°C
ORDERING INFORMATION
PACKAGE ⁽¹⁾
ORDERABLE PART NUMBER
Reel of 250
MSOP/VSSOP – DGK
Reel of 2500
TL7660CDGKT
TL7660CDGKR
PDIP – P
Tube of 50
TL7660CP
SOIC – D
Tube of 75
Reel of 2500
TL7660CD
TL7660CDR
Reel of 250
MSOP/VSSOP – DGK
Reel of 2500
TL7660IDGKT
TL7660IDGKR
PDIP – P
Tube of 50
TL7660IP
SOIC – D
Tube of 75
Reel of 2500
TL7660ID
TL7660IDR
TOP-SIDE MARKING⁽²⁾
TM_
TL7660CP
7660C
TN_
TL7660IP
7660I
(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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated