HT7660芯片引脚定义引脚图及功能IC贸易商引脚图技术参数-中国IC网-芯三七

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产品型号HT7660的概述

芯片HT7660概述 HT7660是一款高效的电源转换芯片，主要用于实现直流直流转换，尤其是负电压的生成与转换。该芯片广泛应用于各类电子设备中，能够满足较高的电流需求，同时具有良好的电源稳压特性。通过内部的振荡电路和电流控制机制，HT7660能够将正电压直接转换为负电压，适合用于供电电路的设计中。芯片HT7660的详细参数 HT7660的主要电气性能参数如下： - 输入电压范围： 1.5V至16V，适用于各种电池供电和直流电源场合。 - 输出电压： -1.5V到-16V，用户可根据电路设计需求进行调节。 - 输出电流：最大400mA，足以支持一般电子产品的功耗需求。 - 开关频率：一般为10kHz至100kHz，能够有效控制电源转换效率。 - 效率：在理想情况下能够达到80%以上，表现出色。 - 静态电流：约为15μA，具备较好的低功耗特性。 - 温度范围： 0°C至70°C...

产品型号HT7660的Datasheet PDF文件预览

HT7660

CMOS Switched-Capacitor Voltage Converter

Features

No external diode required

Typically with no load voltage conversion,

99.9% efficiency

Simple conversion of V_DDto -V_DD

Cascade connection (two devices are

connected, V_OUT= -2 V_DD

)

Typical power efficiency is 98%

Wide operating voltage range: 3V to 12V

Boost pin for higher switching frequency

Easy to use

Requires only two external capacitors

Applications

RS-232 power supply

Operation amplifier supply

Data acquisition systems

Positive voltage doubler

On board negative supply for dynamic

RAMS

Supply voltage splitter, V_O= ± V_DD/2

General Description

HT7660 is a monolithic CMOS switched-capaci-

tor voltage converter. HT7660 is designed to

complete a voltage conversion from positive to

negative. The only required external compo-

nentsaretwolowcostelectrolyticcapacitors.

The frequency of an RC oscillator can be low-

ered by adding an external capacitor between

V_DDand the OSC pin, or an external clock can

be connected to the OSC pin to replace the origi-

nal oscillator. The LV terminal may be tied to

VSS to disable the voltage regulator. By doing

this, low voltage operation can be improved.

HT7660 includes a voltage regulator, an RC os-

cillator and four output power MOS switches.

Block Diagram

VDD

CAP+

OSC

Oscillator

Voltage

Level Shifter

BOOST

CAP

VOUT

Voltage

Regulator

Logic

Network

VSS

November 30, 1999

HT7660

Pin Assignment

A P

Pin Description

Internal

Connection

Pin No. Pin Name I/O

Description

CMOS

Pull-low

BOOST

Higher switching frequency selection input

This pin is connected to the positive terminal of Ca-

pacitor C1 for a charge pump

CAP+

VSS

CMOS

Negative power supply, ground

This pin is connected to the negative terminal of Ca-

pacitor C1 for a charge pump

NMOS

CAP-

This pin is connected to the negative terminal of Ca-

pacitor C2 for charge reservoir. Output voltage pass

through this pin

VOUT

NMOS

Floating this pin enables the voltage regulator. Con-

nect this pin to VSS (Ground) to bypass voltage reg-

ulator and improve low voltage operation

External clock input pin. This pin can be connected

with an external capacitor to reduce switching fre-

quency

Transmission

Gate

OSC

VDD

I/O

Positive power supply

November 30, 1999

HT7660

Absolute Maximum Ratings

Supply Voltage ..............................-0.3V to 13V

Storage Temperature.................-50°C to 125°C

Operating Temperature ..............-40°C to 85°C

Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi-

mum Ratings² 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 expo-

sure to extreme conditions may affect device reliability.

Electrical Characteristics

Ta=25°C

Test Conditions

Symbol

V_DD

Parameter

Min. Typ. Max. Unit

V_DD

Conditions

Operating Voltage

Standby Current

2.5

100

160

I_STB

No load

f_OSC

System Frequency

kHz

_OUT=10mA

_OUT=20mA

150

100

R_OUT

V_CON-EFF

P_EFF

Output Source Resistance

Voltage Conversion Efficiency

Power Efficiency

No load

99.9

R_L=5kW

November 30, 1999

HT7660

Functional Description

HT7660 needs only two external polarized elec-

trolytic capacitors to complete a negative volt-

age converter.

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 fre-

quency Fosc with high voltage range. For low

voltage operation, the LV pin is connected to

V_SSto bypass the voltage regulator of which in-

herent voltage drop can degrade the operation

at low voltages.

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 volt-

age V_DDthrough 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 V_DD. Because the positive ter-

minal of C2 is connected to V_SS, we get a -V_DD

voltage at V_OUTpin.

A capacitor may be connected between V_DDand

pin OSC to lower the switching Fosc, and an ex-

ternal clock may be added to replace the

built-in RC oscillator.

A P

The operating mode of HT7660

November 30, 1999

HT7660

Application Circuits

Simple negative voltage converter

0 F

A P

0 F

Simple voltage multiplier

0 F

A P

0 F

November 30, 1999

HT7660

External switching frequency

0 F

A P

0 F

Lower switching frequency

0 F

A P

0 F

November 30, 1999

HT7660

Positive voltage doubler

0 F

Voltage splitter

7 F

U T

7 F

A P

7 F

November 30, 1999

HT7660

Combined negative voltage converter and positive voltage doubler

0 F

November 30, 1999

HT7660

Holtek Semiconductor Inc. (Headquarters)

No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.

Tel: 886-3-563-1999

Fax: 886-3-563-1189

Holtek Semiconductor Inc. (Taipei Office)

5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.

Tel: 886-2-2782-9635

Fax: 886-2-2782-9636

Fax: 886-2-2782-7128 (International sales hotline)

Holtek Semiconductor (Hong Kong) Ltd.

RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong

Tel: 852-2-745-8288

Fax: 852-2-742-8657

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 pres-

ent a risk to human life due to malfunction or otherwise. 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.

November 30, 1999

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HT7660(8DIP)产品参数

型号:	HT7660(8DIP)
生命周期：	Active
IHS 制造商：	HOLTEK SEMICONDUCTOR INC
包装说明：	DIP, DIP8(UNSPEC)
Reach Compliance Code：	unknown
ECCN代码：	EAR99
风险等级：	5.84
最大输入电压：	12 V
最小输入电压：	3 V
JESD-30 代码：	R-PDIP-T8
端子数量：	8
最高工作温度：	85 °C
最低工作温度：	-40 °C
最大输出电流：	0.02 A
标称输出电压：	-12 V
封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP
封装等效代码：	DIP8(UNSPEC)
封装形状：	RECTANGULAR
封装形式：	IN-LINE
认证状态：	Not Qualified
子类别：	Other Analog ICs
表面贴装：	NO
技术：	CMOS
温度等级：	INDUSTRIAL
端子形式：	THROUGH-HOLE
端子位置：	DUAL

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产品型号HT7660的概述

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