Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsPMICsPMIC - DC/DC voltage regulator Switched-capacitor voltage converter SOIC 8

 2001-2013 Microchip Technology Inc. DS20001467B-page 1

TC7660S

Features:

• Oscillator boost from 10 kHz to 45 kHz

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

• Wide Input Voltage Range: +1.5V to +12V

• Efficient Voltage Conversion (99.9%, typical)

• Excellent Power Efficiency (98%, typical)

• Low Power Consumption: 80 µA (typical) @ V

= 5V

• Low Cost and Easy to Use

- Only Two External Capacitors Required

• Available in 8-Pin Small Outline (SOIC) and 8-Pin

PDIP Packages

• Improved ESD Protection (10 kV HBM)

• No External Diode Required for High-Voltage

Operation

Applications:

• RS-232 Negative Power Supply

• Simple Conversion of +5V to ±5V Supplies

• Voltage Multiplication V

OUT

= ± n V

• Negative Supplies for Data Acquisition Systems

and Instrumentation

Package Types

General Description:

The TC7660S device is a pin-compatible replacement

for the industry standard 7660 charge pump voltage

converter. It converts a +1.5V to +12V input to a corre-

sponding -1.5V to -12V output using only two low-cost

capacitors, eliminating inductors and their associated

cost, size and electromagnetic interference (EMI).

Added features include an extended supply range to

12V, and a frequency boost pin for higher operating fre-

quency, allowing the use of smaller external capacitors.

The on-board oscillator operates at a nominal fre-

quency of 10 kHz. Frequency is increased to 45 kHz

when pin 1 is connected to V

. Operation below 10 kHz

(for lower supply current applications) is possible by

connecting an external capacitor from OSC to ground

(with pin 1 open).

The TC7660S is available in 8-Pin PDIP and 8-Pin

Small Outline (SOIC) packages in commercial and

extended temperature ranges.

TC7660S

BOOST

CAP

GND

CAP

OUT

LOW

VOLTAGE (LV)

OSC

PDIP/CERDIP/SOIC

Super Charge Pump DC-to-DC Voltage Converter

Summary of content (22 pages)

PAGE 1
TC7660S Super Charge Pump DC-to-DC Voltage Converter Features: • • • • • • • Oscillator boost from 10 kHz to 45 kHz Converts +5V Logic Supply to ±5V System Wide Input Voltage Range: +1.5V to +12V Efficient Voltage Conversion (99.
PAGE 2
TC7660S Functional Block Diagram V+ CAP+ 8 BOOST OSC LV 2 1 7 RC Oscillator 2 Voltage Level Translator 4 6 5 CAP- VOUT Internal Internal Voltage Voltage Regulator Regulator Logic Network TC7660S 3 GND DS20001467B-page 2  2001-2013 Microchip Technology Inc.
PAGE 3
TC7660S 1.0 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, 10s) ...... ....................... 150°C ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings* Supply Voltage ................................................................
PAGE 4
TC7660S 2.0 TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
PAGE 5
TC7660S Note: Unless otherwise indicated, C1 = C2 = 10 µF, ESRC1 = ESRC2 = 1 , TA = 25°C. See Figure 4-1. 100 0 POWER EFFICIENCY (%) -4 -6 -8 -10 -12 Boost Pin = V+ 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA) FIGURE 2-7: Current. LOAD CURRENT (mA) Output Voltage vs. Output FIGURE 2-10: Power Conversion Efficiency vs. Load. 200 200 175 175 SUPPLY CURRENT IDD (μA) SUPPLY CURRENT IDD (μA) Boost Pin = Open 80 150 125 VIN = 12.5V 100 75 50 VIN = 5.
PAGE 6
TC7660S 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: 3.1 PIN FUNCTION TABLE Pin No. Symbol 1 BOOST 2 CAP+ Charge pump capacitor positive terminal 3 GND Ground terminal 4 CAP- Charge pump capacitor negative terminal 5 VOUT Output voltage 6 LV 7 OSC 8 V+ Description Switching Frequency boost pin Low voltage pin. Connect to GND for V+ < 3.5V Oscillator control input. Bypass with an external capacitor to slow the oscillator.
PAGE 7
TC7660S 4.0 DETAILED DESCRIPTION 4.1 V+ Theory of Operation The four switches in Figure 4-2 are MOS power switches; S1 is a P-channel device, and S2, S3 and S4 are N-channel devices. The main difficulty with this approach is that in integrating the switches, the substrates of S3 and S4 must always remain reversebiased with respect to their sources, but not so much as to degrade their ON resistances.
PAGE 8
TC7660S 5.0 APPLICATIONS INFORMATION 5.1 Simple Negative Voltage Converter The dynamic output impedance of the TC7660S is due, primarily, to capacitive reactance of the charge transfer capacitor (C1). Since this capacitor is connected to the output for only half of the cycle, the equation is: Figure 5-1 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.
PAGE 9
TC7660S 5.3 Cascading Devices The TC7660S may be cascaded as shown (Figure 5-3) to produce larger negative multiplication of the initial supply voltage. However, due to the finite efficiency of each device, the practical limit is 10 devices for light loads. The output voltage is defined by: C1 + 2 3 7 TC7660S COSC 6 VOUT 5 4 EQUATION V+ 8 1 + V OUT = – n  V  + where n is an integer representing the number of devices cascaded.
PAGE 10
TC7660S 5.6 Combined Negative Voltage Conversion and Positive Supply Multiplication Figure 5-7 combines the functions shown in Figure 5-3 and Figure 5-6 to provide negative voltage conversion and positive voltage multiplication simultaneously. For example, this approach would be suitable for generating +9V and – 5V from an existing +5V supply.
PAGE 11
TC7660S 6.0 PACKAGING INFORMATION 6.1 Package Marking Information 8-Lead PDIP (300 mil) Example XXXXXXXX XXXXXNNN YYWW 8-Lead SOIC (3.90 mm) TC7660S CPA e3 256 1320 TC7660S CPA e3 256 Example Example TC7660SE TC7660SE OA e3 1320 NNN Legend: XX...
PAGE 12
TC7660S 4 & ' !& " & 5 && 366*** ' '6 # * !( 5 ! ! & 5 % & & # & N NOTE 1 E1 1 3 2 D E A2 A L A1 c e eB b1 b 7 &! ' ! : ' &! 8"') % ! 8,9. 8 8 8; < = & 2 , & & > > 1 - 1 1 > > " # & " # ? #& . - - 1 # # 5 .
PAGE 13
TC7660S Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging  2001-2013 Microchip Technology Inc.
PAGE 14
TC7660S Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS20001467B-page 14  2001-2013 Microchip Technology Inc.
PAGE 15
TC7660S ! " " ## $% &' !" ( 4 & ' !& " & 5 && 366*** ' '6  2001-2013 Microchip Technology Inc.
PAGE 16
TC7660S NOTES: DS20001467B-page 16  2001-2013 Microchip Technology Inc.
PAGE 17
TC7660S APPENDIX A: REVISION HISTORY Revision B (August 2013) The following is the list of modifications. 1. 2. Added Appendix A and the “Product Identification System” page. Updated Section 6.0 “Packaging Information”. Revision A (May 2001) • Original release of this document.  2001-2013 Microchip Technology Inc.
PAGE 18
TC7660S NOTES: DS20001467B-page 18  2001-2013 Microchip Technology Inc.
PAGE 19
TC7660S PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO.
PAGE 20
TC7660S NOTES: DS20001467B-page 20  2001-2013 Microchip Technology Inc.
PAGE 21
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 22
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