TC1047_06_技术文档

TC962

High Current Charge Pump DC-to-DC Converter

Features:

General Description:

• Pin Compatible With TC7662/ICL7662/SI7661

• High Output Current 80 mA

The TC962 is an advanced version of the industry

standard TC7662 high voltage DC-to-DC converter.

Using improved design techniques and CMOS

construction, the TC962 can source as much as 80 mA

versus the 7662’s 20 mA capability.

• No External Diodes Required

• Wide Operating Range 3V to 18V

• Low Output Impedance 28Ω Typ.

• No Low Voltage Terminal Required

• Application Zener On-Chip

As an inverter, the TC962 can put out voltages as high

as 18V and as low as 3V without the need for external

diodes. The output impedance of the device is a low

28Ω (with the proper capacitors), voltage conversion

efficiency is 99.9%, and power conversion efficiency is

97%.

• OSC Frequency Doubling Pin Option for Smaller

Output Capacitors

Applications:

The low voltage terminal (pin 6) required in some

TC7662 applications has been eliminated. Grounding

this terminal will double the oscillator frequency from 12

kHz to 24 kHz. This will allow the use of smaller

capacitors for the same output current and ripple, in

most applications. Only two external capacitors are

required for inverter applications. In the event an

external clock is needed to drive the TC962 (such as

paralleling), driving this pin directly will cause the

internal oscillator to sync to the external clock.

• Laptop Computers

• Disk Drives

• Process Instrumentation

• μP-Based Controllers

Device Selection Table

Operating

Temp.

Range

Part

Number

Package

Pin 1, which is used as a test pin on the 7662, is a

voltage reference Zener on the TC962. This Zener (6.4V

at 5 mA) has a dynamic impedance of 12Ω and is

intended for use where the TC962 is supplying current to

external regulator circuitry and a reference is needed for

the regulator circuit. (See Section 3.0 “Applications

Information” Applications Information).

TC962COE 16-Pin SOIC Wide

0°C to +70°C

TC962CPA

TC962EPA

TC962IJA

TC962MJA

8-Pin Plastic DIP

8-Pin CERDIP

-40°C to +85°C

-25°C to +85°C

-55°C to +125°C

The TC962 is compatible with the LTC1044, SI7661

and ICL7662. It should be used in designs that require

greater power and/or less input to output voltage drop.

It offers superior performance over the ICL7660S.

Package Type

16-Pin SOIC Wide

Zener

1

2

3

4

5

6

7

8

16

15

V

DD

Cathode

8-Pin DIP

8-Pin CERDIP

NC

+

Zener

14 C

C

OSC

V

1

2

3

4

8

7

6

5

DD

•

Cathode

NC

GND

NC

13

12

11

NC

+

TC962CPA

TC962EPA

TC962IJA

TC962MJA

C

OSC

TC962COE

FREQ x 2

NC

GND

FREQ x 2

–

C

V

OUT

–

C

10 V

9

OUT

NC

DS21484C-page 1

TC962

Functional Block Diagram

8

V

DD

6

I

FREQ x 2

TC962

–

7

OSC/C

Timing

Level

Shift

P SW1

N SW4

Q

2

+

–

F/F

CAP

C

Q

Level

Shift

+

C

P

Comparator

with Hysteresis

External

GND

3

1

Zener

V

Cathode

REF

6.4V

+

OUT

–

C

R

EXT

Level

Shift

N SW2

N SW3

4

CAP

R

L

Level

Shift

5

V

OUT

DS21484C-page 2

TC962

*Stresses above those listed under “Absolute

Maximum Ratings” may cause permanent damage to

the device. These are stress ratings only and functional

operation of the device at these or any other conditions

above those indicated in the operation sections of the

specifications is not implied. Exposure to Absolute

Maximum Rating conditions for extended periods may

affect device reliability.

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Supply Voltage (V_DDto GND) ..............................+18V

Input Voltage Any Pin

......................... (V_DD+0.3) to (V_SS-0.3) (Note 1)

Current Into Any Pin...........................................10 mA

ESD Protection ................................................±2000V

Output Short Circuit ........... Continuous (at 5.5V Input)

Package Power Dissipation (T_A≤ 70°C)

SOIC .......................................................760 mW

PDIP........................................................730 mW

CERDIP ..................................................800 mW

Package Thermal Resistance

CERDIP, Rθ_J-A.........................................90°C/W

PDIP, Rθ_J-A............................................140°C/W

Operating Temperature Range

CPA, COE ....................................... 0°C to +70°C

IJA................................................-25°C to +85°C

EPA ..............................................-40°C to +85°C

MJA............................................-55°C to +125°C

Storage Temperature Range .............-65°C to +150°C

TC962 ELECTRICAL SPECIFICATIONS

Electrical Characteristics: V = 15V, T = 25°C (See Figure ) unless otherwise noted.

DD

A

Symbol

Parameter

Min

Typ

Max

Units

Test Conditions

V

I

Supply Voltage

Supply Current

3

—

18

V

DD

—

700

—

μA

R = ∞

L

S

V

= 15V

510

560

650

190

210

T = +25°C

DD

A

0 ≤ T ≤ +70°C

A

-55°C ≤ T ≤ +125°C

A

V

= 5V

T = +25°C

DD

A

—

0 ≤ T ≤ +70°C

A

-55°C ≤ T ≤ +125°C

A

R

Output Source

Resistance

—

32

35

—

37

40

50

Ω

I = 20 mA, V = 15V

O

L

DD

I = 80 mA, V = 15V

L

DD

I = 3 mA, V = 5V

L

DD

F

Oscillator Frequency

Power Efficiency

—

12

24

—

kHz

%

Pin 6 Open

Pin 6 GND

OSC

P

93

—

97

—

R = 2 kΩ

EFF

DEF

L

V

Voltage Efficiency

99

—

96

99.9

—

%

R = ∞

L

Over temperature range

V

Z

Zener Voltage

6.0

6.2

6.4

V

I = 5 mA

Z

Zener Impedance

—

12

—

Ω

I = 2.5 mA to 7.5 mA

ZT

L

Note 1: Connecting any input terminal to voltages greater than V⁺or less than GND may cause destructive latch-up. It is recommended that no

inputs from sources operating from external supplies be applied prior to “power-up” of the TC962.

DS21484C-page 3

TC962

2.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

TABLE 2-1:

PIN FUNCTION TABLE

Pin No.

(8-Pin DIP)

Symbol

Description

(8-Pin CERDIP)

1

2

3

4

5

6

7

8

Zener Cathode Cathode of internal Zener diode.

+

C

Positive side of external CP capacitor (pump cap).

Ground terminal.

GND

-

C

Negative side of external CP capacitor (pump cap).

Output voltage.

V

OUT

FREQ x 2

If grounded, frequency doubles.

Capacitor to GND will decrease frequency.

Input voltage.

C

OSC

V

DD

Pin No.

(16-Pin SOIC)

Symbol

Zener Cathode Cathode of internal Zener diode.

Description

1

2

NC

No connect.

+

3

C

Positive side of external CP capacitor (pump cap).

4

NC

GND

NC

No connect.

5

Ground terminal.

6

No connect.

-

7

C

Negative side of external CP capacitor (pump cap).

No connect.

8

NC

9

No connect.

10

11

12

13

14

15

16

V

Output voltage.

OUT

NC

FREQ x 2

NC

No connect.

If grounded, frequency doubles.

No connect.

C

Capacitor to GND will decrease frequency.

No connect.

OSC

NC

V

Input voltage.

DD

DS21484C-page 4

TC962

current source and double the frequency. This will

double the charge current going into the internal

capacitor, as well as any capacitor added to pin 7.

3.0

3.1

APPLICATIONS INFORMATION

Theory of Operation

A Zener diode has been added to the TC962 for use as

a reference in building external regulators. This Zener

runs from pin 1 to ground.

The TC962 is a capacitive pump (sometimes called a

switched capacitor circuit), where four MOSFET

switches control the charge and discharge of a

capacitor.

3.2

Latch-Up

The functional block diagram shows how the switching

action works. SW1 and SW2 are turned on simulta-

neously, charging C_Pto the supply voltage, V_IN. This

assumes that the on resistance of the MOSFETs in

series with the capacitor results in a charging time

(3 time constants) that is less than the on time provided

by the oscillator frequency as shown:

All CMOS structures contain a parasitic SCR. Care

must be taken to prevent any input from going above or

below the supply rail, or latch-up will occur. The result

of latch-up is an effective short between V_DDand V_SS

.

Unless the power supply input has a current limit, this

latch-up phenomena will result in damage to the

device. (See AN763, Latch-up Protection for MOSFET

Drivers.)

3 (R_DS(ON)C_P) < C_P/(0.5 f_OSC

)

In the next cycle, SW1 and SW2 are turned off and after

a very short interval of all switches being off (this

prevents large currents from occurring due to cross

conduction), SW3 and SW4 are turned on. The charge

in C_Pis then transferred to C_R, but with the polarity

inverted. In this way, a negative voltage is now derived.

690

I

S

+

V

1

2

8

7

NC

(+5V)

I

L

An oscillator supplies pulses to a flip-flop that is then

fed to a set of level shifters. These level shifters then

drive each set of switches at one-half the oscillator

frequency.

+

10 μF

C

3

4

TC962

R

OSC

C

L

C

P

V

(–5V)

5

OUT

10 μF

R

The oscillator has two pins that control the frequency of

oscillation. Pin 7 can have a capacitor added that is

returned to ground. This will lower the frequency of the

oscillator by adding capacitance to the timing capacitor

internal to the TC962. Grounding pin 6 will turn on a

+

FIGURE 3-1:

Test Circuit

Combined Negative Converter and Positive Multiplier

+

Split V In Half

+

V

1

2

8

7

1

2

8

7

V

D1

10 μF

V

+

D2

+

10 μF

V

=

TC962

OUT

+

C

3

4

6

3

4

6

5

C

TC962

P

P2

+

= –V

V

OUT

2V –2V

10 μF

D

5

+

C

R1

+

10 μF

V

2

+

V

=

C

OUT

P1

+

C

R

10 μF

Lowering Output Resistance by Paralleling Devices

Positive Voltage Multiplier

+

V

+

V

1

2

8

7

8

1

2

1

2

8

7

V

D1

7

6

5

V

D2

+

10 μF

V

=

TC962

OUT

+

3

4

TC962

C

3

4

TC962

6

5

3

4

6

5

C

P2

P1

2V –2V

D

+

10 μF

C

P

10 μF

V

OUT

10 μF

C

R

+

FIGURE 3-2:

Typical Applications

DS21484C-page 5

TC962

4.0

TYPICAL CHARACTERISTICS

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.

Circuit of Figure , C_P= C_R= 10 μF, C_PESR≈ C_RESR≈ 1Ω.

Frequency vs. Temperature

Oscillator Frequency vs. C_OSC

Supply Current vs. Temperature

20

18

16

700

600

T

= +25°C

C

= FREQ x 2 = OPEN

A

OSC

10k

500

400

300

200

+

1k

14

12

10

V

= 15V

100

+

V

= 15V

8

6

100

0

10

1

10

100

1000

10,000

-60 -40 -20

0

20 40 60 80 100 120 140

-60 -40 -20

0

20 40 60 80 100 120 140

CAPACITANCE (pF)

TEMPERATURE (°C)

Output Resistance vs. Temperature

Current vs. Zener Voltage

Power Conversion Efficiency vs. I _LOAD

80

70

T

= +25°C

T

= +25°C

A

150

50

100

90

A

135

120

EFFICIENCY

60

50

40

30

20

80

70

60

+

105

90

V

= 5V I = 3 mA

L

SUPPLY

CURRENT

50

75

40

30

20

10

0

60

45

30

15

0

+

30

20

10

V

= 15V I = 20 mA

L

10

0

4.5

4.0

ZENER VOLTAGE (V)

5.5

6.0

6.5

7.0

8

16 24 32 40 48 56 64 72 80

-60 -40 -20

0

20 40 60 80 100 120 140

TEMPERATURE (°C)

LOAD CURRENT (mA)

Output Resistance vs. Input Voltage

110

100

90

T

= +25°C

A

80

70

60

50

40

30

20

3 μA

20 μA

10

0

2

4

6

8

10 12 14 16 18 20

INPUT VOLTAGE (V)

DS21484C-page 6

TC962

5.0

5.1

PACKAGING INFORMATION

Package Marking Information

Package marking data not available at this time.

5.2

Taping Form

Component Taping Orientation for 16-Pin SOIC (Wide) Devices

User Direction of Feed

Pin 1

W

P

Standard Reel Component Orientation

for 713 Suffix Device

Carrier Tape, Number of Components Per Reel and Reel Size

Package

Carrier Width (W)

Pitch (P)

Part Per Full Reel

Reel Size

16-Pin SOIC (W)

16 mm

12 mm

1000

13 in

5.3

Package Dimensions

8-Pin CDIP (Narrow)

.110 (2.79)

.090 (2.29)

Pin 1

.300 (7.62)

.230 (5.84)

.020 (0.51) Min.

.055 (1.40) Max.

.320 (8.13)

.290 (7.37)

.400 (10.16)

.370 (9.40)

.040 (1.02)

.020 (0.51)

.200 (5.08)

.160 (4.06)

.015 (0.38)

.008 (0.20)

3° Min.

.150 (3.81)

Min.

.200 (5.08)

.125 (3.18)

.400 (10.16)

.320 (8.13)

.065 (1.65)

.045 (1.14)

.020 (0.51)

.016 (0.41)

Dimensions: inches (mm)

DS21484C-page 7

TC962

Package Dimensions (Continued)

8-Pin Plastic DIP

Pin 1

.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)

.015 (0.38)

.008 (0.20)

3° Min.

.150 (3.81)

.115 (2.92)

.400 (10.16)

.310 (7.87)

.110 (2.79)

.090 (2.29)

.022 (0.56)

.015 (0.38)

Dimensions: inches (mm)

16-Pin SOIC (Wide)

Pin 1

.299 (7.59) .419 (10.65)

.291 (7.40) .398 (10.10)

.413 (10.49)

.398 (10.10)

.104 (2.64)

.097 (2.46)

8°

Max.

.013 (0.33)

.009 (0.23)

.012 (0.30)

.004 (0.10)

.019 (0.48)

.014 (0.36)

.050 (1.27) Typ.

.050 (1.27)

.016 (0.40)

Dimensions: inches (mm)

DS21484C-page 8

TC962

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DS21484C-page 9

TC962

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TC962

DS21484C

Literature Number:

Device:

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DS21484C-page 10

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. All of these methods, to our

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•

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DS21484C-page 11

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Tel: 86-532-8502-7355

Fax: 86-532-8502-7205

Atlanta

Korea - Seoul

Alpharetta, GA

Tel: 770-640-0034

Fax: 770-640-0307

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

Spain - Madrid

Tel: 34-91-708-08-90

Fax: 34-91-708-08-91

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

Boston

Malaysia - Penang

Tel: 60-4-646-8870

Fax: 60-4-646-5086

Westborough, MA

Tel: 774-760-0087

Fax: 774-760-0088

UK - Wokingham

Tel: 44-118-921-5869

Fax: 44-118-921-5820

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

Philippines - Manila

Tel: 63-2-634-9065

Fax: 63-2-634-9069

Chicago

Itasca, IL

Tel: 630-285-0071

Fax: 630-285-0075

China - Shenzhen

Tel: 86-755-8203-2660

Fax: 86-755-8203-1760

Singapore

Tel: 65-6334-8870

Dallas

Addison, TX

Tel: 972-818-7423

Fax: 972-818-2924

Fax: 65-6334-8850

China - Shunde

Tel: 86-757-2839-5507

Fax: 86-757-2839-5571

Taiwan - Hsin Chu

Tel: 886-3-572-9526

Fax: 886-3-572-6459

China - Wuhan

Tel: 86-27-5980-5300

Fax: 86-27-5980-5118

Detroit

Taiwan - Kaohsiung

Tel: 886-7-536-4818

Fax: 886-7-536-4803

Farmington Hills, MI

Tel: 248-538-2250

Fax: 248-538-2260

China - Xian

Tel: 86-29-8833-7250

Fax: 86-29-8833-7256

Taiwan - Taipei

Tel: 886-2-2500-6610

Fax: 886-2-2508-0102

Kokomo

Kokomo, IN

Tel: 765-864-8360

Fax: 765-864-8387

Thailand - Bangkok

Tel: 66-2-694-1351

Fax: 66-2-694-1350

Los Angeles

Mission Viejo, CA

Tel: 949-462-9523

Fax: 949-462-9608

San Jose

Mountain View, CA

Tel: 650-215-1444

Fax: 650-961-0286

Toronto

Mississauga, Ontario,

Canada

Tel: 905-673-0699

Fax: 905-673-6509

06/08/06

DS21484C-page 12


型号：	TC1047_06
厂家：	MICROCHIP
描述：	High Current Charge Pump DC-to-DC Converter 高电流电荷泵DC - DC转换器转换器泵
文件：	总12页 (文件大小：456K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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