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TC7660H-2 10/1/96

EVALUATION

KIT

AVAILABLE

TC7660H

HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER

FEATURES

■ Pin Compatible with 7660, High Frequency

Performance DC-to-DC Converter

■ Low Cost, Two Low Value External Capacitors

Required ........................................................ (1.0µF)

■ Converts +5V Logic Supply to ±5V System

■ Wide Input Voltage Range ....................1.5V to 10V

■ Voltage Conversion ........................................99.7%

■ Power Efficiency ................................................85%

■ Available in 8-Pin SOIC and 8-Pin PDIP Packages

GENERAL DESCRIPTION

The TC7660H is a pin-compatible, high frequency up-

grade to the Industry standard TC7660 charge pump volt-

age converter. It converts a +1.5V to +10V input to a

corresponding – 1.5V to – 10V output using only two low-

cost capacitors, eliminating inductors and their associated

cost, size and EMI.

The TC7660H operates at a frequency of 120kHz

(versus 10kHz for the TC7660), allowing the use of 1.0µF

external capacitors. Oscillator frequency can be reduced

(for lower supply current applications) by connecting an

external capacitor from OSC to ground.

The TC7660H is available in 8-pin DIP and small

outline (SOIC) packages in commercial and extended

temperature ranges.

FUNCTIONAL BLOCK DIAGRAM

ORDERING INFORMATION

Temperature

Part No. Package Range

TC7660HCOA 8-Pin SOIC 0°C to +70°C

TC7660HCPA 8-Pin Plastic DIP 0°C to +70°C

TC7660HEOA 8-Pin SOIC – 40°C to +85°C

TC7660HEPA 8-Pin Plastic DIP – 40°C to +85°C

TC7660EV Evaluation Kit for

Charge Pump Family

TC7660H

GND

INTERNAL

VOLTAGE

REGULATOR

OSCILLATOR

VOLTAGE–

LEVEL

TRANSLATOR

÷ 2

CAP

OSC

LOGIC

NETWORK

OUT

CAP

–

CAP

–

OUT

LOW

VOLTAGE (LV)

OSC

CAP

GND

CAP

–

OUT

LOW

VOLTAGE (LV)

OSC

NC = NO INTERNAL CONNECTION

TC7660HCPA

TC7660HEPA

TC7660HCOA

TC7660HEOA

PIN CONFIGURATION (DIP and SOIC)

Summary of content (8 pages)

PAGE 1
EVALUATION KIT AVAILABLE TC7660H HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER FEATURES GENERAL DESCRIPTION ■ The TC7660H is a pin-compatible, high frequency upgrade to the Industry standard TC7660 charge pump voltage converter. It converts a +1.5V to +10V input to a corresponding – 1.5V to – 10V output using only two lowcost capacitors, eliminating inductors and their associated cost, size and EMI. The TC7660H operates at a frequency of 120kHz (versus 10kHz for the TC7660), allowing the use of 1.
PAGE 2
HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER TC7660H Operating Temperature Range C Suffix .................................................. 0°C to +70°C E Suffix ............................................ – 40°C to +85°C Storage Temperature Range ............... – 65°C to +150°C Lead Temperature (Soldering, 10 sec) ................. +300°C ABSOLUTE MAXIMUM RATINGS* Supply Voltage ...................................................... +10.5V LV and OSC Inputs Voltage (Note 1) ........................
PAGE 3
HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER TC7660H To improve low-voltage operation, the LV pin should be connected to GND. For supply voltages greater than 3.5V, the LV terminal must be left open to ensure latch-upproof operation and prevent device damage. IS C1 1.
PAGE 4
HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER TC7660H Simple Negative Voltage Converter V+ Figure 3 shows typical connections to provide a negative supply where a positive supply is available. A similar scheme may be employed for supply voltages anywhere in the operating range of +1.5V to +10V, keeping in mind that pin 6 (LV) is tied to the supply negative (GND) only for supply voltages below 3.5V.
PAGE 5
HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER TC7660H V 1 8 2 C1 3 + TC7660H "1" 4 7 1 8 6 2 7 5 C1 3 TC7660H 4 "n" RL 6 5 RL + C2 Figure 5. Paralleling Devices Lowers Output Impedance V+ 1 8 2 7 1 kΩ 1.0 µF + 3 TC7660H Figure 8 combines the functions shown in Figures 3 and 8 to provide negative voltage conversion and positive voltage multiplication simultaneously. This approach would be, for example, suitable for generating +9V and –5V from an existing +5V supply.
PAGE 6
HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER TC7660H Efficient Positive Voltage Multiplication/ Conversion VOUT = –V– Since the switches that allow the charge pumping operation are bidirectional, the charge transfer can be performed backwards as easily as forwards. Figure 9 shows a TC7660H transforming –5V to +5V (or +5V to +10V, etc.). The only problem here is that the internal clock and switchdrive section will not operate until some positive voltage has been generated.
PAGE 7
HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER TC7660H PACKAGE DIMENSIONS PIN 1 8-Pin Plastic DIP Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging .260 (6.60) .240 (6.10) .045 (1.14) .030 (0.76) .070 (1.78) .040 (1.02) .310 (7.87) .290 (7.37) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .040 (1.02) .020 (0.51) .150 (3.81) .115 (2.92) .110 (2.79) .090 (2.29) .015 (0.38) .008 (0.20) 3° MIN. .400 (10.
PAGE 8
HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER TC7660H WORLDWIDE SALES AND SERVICE AMERICAS New York Corporate Office 150 Motor Parkway, Suite 202 Hauppauge, NY 11788 Tel: 631-273-5305 Fax: 631-273-5335 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: 480-792-7627 Web Address: http://www.microchip.com Rocky Mountain 2355 West Chandler Blvd.