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HT7660
CMOS Switched-Capacitor Voltage Converter
Features
* Simple conversion of VDD to -VDD * Cascade connection (two devices are connected, * No external diode required * Typically with no load voltage conversion, 99.9% effi-
VOUT= -2 VDD)
* Boost pin for higher switching frequency * Easy to use - Requires only two external capacitors
ciency
* Typical power efficiency is 98% * Wide operating voltage range: 3V to 12V * 8-pin DIP/SOP package
Applications
* RS-232 power supply * On board negative supply for dynamic RAMS * Supply voltage splitter, VO= VDD/2 * Operation amplifier supply * Data acquisition systems * Positive voltage doubler
General Description
HT7660 is a monolithic CMOS switched-capacitor voltage converter. HT7660 is designed to complete a voltage conversion from positive to negative. The only required external components are two low cost electrolytic capacitors. HT7660 includes a voltage regulator, an RC oscillator and four output power MOS switches. The frequency of an RC oscillator can be lowered by adding an external capacitor between VDD and the OSC pin, or an external clock can be connected to the OSC pin to replace the original oscillator. The LV terminal may be tied to VSS to disable the voltage regulator. By doing this, low voltage operation can be improved.
Block Diagram
VDD OSC BOOST RC Oscillator Voltage Level Shifter CAP+ CAP
VOUT LV Voltage Regulator Logic Network
VSS
Rev. 1.10
1
January 21, 2003
HT7660
Pin Assignment
BOO CA V CA ST P+ SS P1 8 2 7 3 6 4 5 VDD OSC LV VOUT
H T7660 8 D IP -A /S O P -A
Pin Description
Pin No. Pin Name I/O 1 2 3 4 5 BOOST CAP+ VSS CAPVOUT I O 3/4 O O Internal Connection CMOS Pull-low CMOS 3/4 NMOS NMOS 3/4 Description Higher switching frequency selection input This pin is connected to the positive terminal of Capacitor C1 for a charge pump Negative power supply, ground This pin is connected to the negative terminal of Capacitor C1 for a charge pump This pin is connected to the negative terminal of Capacitor C2 for charge reservoir. Output voltage pass through this pin Floating this pin enables the voltage regulator. Connect this pin to VSS (Ground) to bypass voltage regulator and improve low voltage operation External clock input pin. This pin can be connected with an external capacitor to reduce switching frequency Positive power supply
6
LV
I
7 8
OSC VDD
I/O Transmission Gate 3/4 3/4
Absolute Maximum Ratings
Supply Voltage ...........................VSS-0.3V to VSS+13V Storage Temperature ............................-50C to 125C Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. Operating Temperature...........................-40C to 85C
Electrical Characteristics
Symbol VDD ISTB fOSC ROUT VCON-EFF PEFF Parameter Operating Voltage Standby Current Test Conditions VDD 3/4 3V 5V 3V 5V 3V 5V 3V 5V 3V 5V Conditions 3/4 No load 3/4 IOUT=10mA IOUT=20mA No load Min. 3 3/4 3/4 2.5 5 3/4 3/4 99 99 96 96 Typ. 3/4 26 80 4 10 97 60 3/4 99.9 3/4 98 Max. 12 100 160 3/4 3/4 150 100 3/4 3/4 3/4 3/4
Ta=25C Unit V mA kHz W %
System Frequency
Output Source Resistance
Voltage Conversion Efficiency
Power Efficiency
RL=5kW
%
Rev. 1.10
2
January 21, 2003
HT7660
Functional Description
HT7660 needs only two external polarized electrolytic capacitors to complete a negative voltage converter. HT7660 has four MOS power switches: S1, S2, S3 and S4. For the first half cycle, when S2 and S4 are open, Capacitor C1 is charged to a voltage VDD through S1 and S3. During the second half cycle, when S1 and S3 are open, the charge on Capacitor C1 is shifted to Capacitor C2 through S2 and S4. Thereby, the voltage across Capacitor C2 is VDD. Because the positive terminal of C2 is connected to VSS, we get a -VDD voltage at VOUT pin.
V V
DD
For high voltage operation, the LV pin is left floating to enable the voltage regulator. This can reduce the current consumption of the RC oscillator, and thus get a fixed switching frequency fOSC with high voltage range. For low voltage operation, the LV pin is connected to VSS to bypass the voltage regulator of which inherent voltage drop can degrade the operation at low voltages. A capacitor may be connected between VDD and pin OSC to lower the switching fOSC, and an external clock may be added to replace the built-in RC oscillator.
S1
CAP+ C1
S2
SS
V C2 S3 CAPS4 V
SS
OUT
= -V
DD
The operating mode of HT7660
Application Circuits
Simple Negative Voltage Converter
V
DD
V 1 2 BOOST CAP+ VDD LV 4 3 CAPVSS VOUT 8 6 5
DD
10m.
V
OUT
= -V
DD
H T7660
Simple Voltage Multiplier
V VDD 8 2 5 10m. 4 3
DD
10m.
2 10m. 4 3
CAP+
CAP+
VDD
8
CAPVSS VOUT
CAPVSS
VOUT
5 V 10m.
OUT
= -2V
DD
H T7660
H T7660
10m.
Rev. 1.10
3
January 21, 2003
HT7660
External Switching Frequency
V VDD OSC 4 3 CAPVSS VOUT 5 V 10m. 8 V 7 1kW
DD
2 10m.
CAP+
DD
CMOS G a te
OUT
H T7660
Lower Switching Frequency
V VDD OSC 4 3 CAPVSS VOUT 5 V 10m. 8 7 C
OSC DD
2 10m.
CAP+
OUT
N o te : C
Positive Voltage Doubler
OSC
H T7660 is te n s o f p ic o fa r a d
V VDD 8
DD
2 3
CAP+ VSS
D1 5 D2 V 10m.
VOUT
OUT
= 2V
DD
-2V
D
H T7660 N o te : V
D
10m.
is fo r w a r d v o lta g e d r o p o f d io d e D 1 a n d D 2
Voltage Splitter
V R
L1 DD
47m. V = V 2 2 47m. 4 3 47m. CAPVSS VDD CAP+ LV VOUT 6 5 8
V R
OUT L2
DD-
EE
H T7660
V
EE
Rev. 1.10
4
January 21, 2003
HT7660
Combined Negative Voltage Converter and Positive Voltage Doubler
V VDD 8
DD
2 10m. 4 3
CAP+
V D1 5 10m.
OUT
= -V
DD
CAPVSS
VOUT
H T7660
10m.
D2 V 10m.
OUT
= 2V
DD
-2V
D
N o te : V
D
is fo r w a r d v o lta g e d r o p o f d io d e D 1 a n d D 2
Rev. 1.10
5
January 21, 2003
HT7660
Package Information
8-pin DIP (300mil) Outline Dimensions
A B 1 8 5 4
H C D E . G
a
I
Symbol A B C D E F G H I a
Dimensions in mil Min. 355 240 125 125 16 50 3/4 295 335 0 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 100 3/4 3/4 3/4 Max. 375 260 135 145 20 70 3/4 315 375 15
Rev. 1.10
1
January 21, 2003
HT7660
8-pin SOP (150mil) Outline Dimensions
A 1
8
5 B 4
C
C' G D E .
H
a
Symbol A B C C D E F G H a
Dimensions in mil Min. 228 149 14 189 53 3/4 4 22 4 0 Nom. 3/4 3/4 3/4 3/4 3/4 50 3/4 3/4 3/4 3/4 Max. 244 157 20 197 69 3/4 10 28 12 10
Rev. 1.10
2
January 21, 2003
HT7660
Product Tape and Reel Specfications
Reel Dimensions
T2 D
A
B
C
T1
SOP 8N Symbol A B C D T1 T2 Description Reel Outer Diameter Reel Inner Diameter Spindle Hole Diameter Key Slit Width Space Between Flange Reel Thickness Dimensions in mm 3301.0 621.5 13.0+0.5 -0.2 2.00.15 12.8+0.3 -0.2 18.20.2
Rev. 1.10
3
January 21, 2003
HT7660
Carrier Tape Dimensions
D
E .
P0
P1
t
W C
B0
D1
P
K0 A0
SOP 8N Symbol W P E F D D1 P0 P1 A0 B0 K0 t C Description Carrier Tape Width Cavity Pitch Perforation Position Cavity to Perforation (Width Direction) Perforation Diameter Cavity Hole Diameter Perforation Pitch Cavity to Perforation (Length Direction) Cavity Length Cavity Width Cavity Depth Carrier Tape Thickness Cover Tape Width Dimensions in mm 12.0+0.3 -0.1 8.00.1 1.750.1 5.50.1 1.550.1 1.5+0.25 4.00.1 2.00.1 6.40.1 5.200.1 2.10.1 0.30.05 9.3
Rev. 1.10
4
January 21, 2003
HT7660
Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan Tel: 886-3-563-1999 Fax: 886-3-563-1189 http://www.holtek.com.tw Holtek Semiconductor Inc. (Taipei Sales Office) 4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan Tel: 886-2-2655-7070 Fax: 886-2-2655-7373 Fax: 886-2-2655-7383 (International sales hotline) Holtek Semiconductor Inc. (Shanghai Sales Office) 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China 200233 Tel: 021-6485-5560 Fax: 021-6485-0313 http://www.holtek.com.cn Holtek Semiconductor Inc. (Shenzhen Sales Office) 5/F, Unit A, Productivity Building, Cross of Science M 3rd Road and Gaoxin M 2nd Road, Science Park, Nanshan District, Shenzhen, China 518057 Tel: 0755-8616-9908, 8616-9308 Fax: 0755-8616-9533 Holtek Semiconductor Inc. (Beijing Sales Office) Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031 Tel: 010-6641-0030, 6641-7751, 6641-7752 Fax: 010-6641-0125 Holtek Semiconductor Inc. (Chengdu Sales Office) 709, Building 3, Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China 610016 Tel: 028-6653-6590 Fax: 028-6653-6591 Holmate Semiconductor, Inc. (North America Sales Office) 46729 Fremont Blvd., Fremont, CA 94538 Tel: 510-252-9880 Fax: 510-252-9885 http://www.holmate.com Copyright O 2003 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holteks products are not authorized for use as critical components in life support devices or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
Rev. 1.10
5
January 21, 2003

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