TC7660EOATR 데이터 시트보기 (PDF) - Microchip Technology

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TC7660EOATR

Charge Pump DC-to-DC Voltage Converter

Microchip Technology 

TC7660

3.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

Pin No.

1

2

3

4

5

6

7

8

PIN FUNCTION TABLE

Symbol

Description

NC

CAP+

GND

CAP-

VOUT

LV

OSC

V+

No connection

Charge pump capacitor positive terminal

Ground terminal

Charge pump capacitor negative terminal

Output voltage

Low voltage pin. Connect to GND for V+ < 3.5V

Oscillator control input. Bypass with an external capacitor to slow the oscillator

Power supply positive voltage input

3.1 Charge Pump Capacitor (CAP+)

3.5 Low Voltage Pin (LV)

Positive connection for the charge pump capacitor, or

flying capacitor, used to transfer charge from the input

source to the output. In the voltage-inverting configura-

tion, the charge pump capacitor is charged to the input

voltage during the first half of the switching cycle. Dur-

ing the second half of the switching cycle, the charge

pump capacitor is inverted and charge is transferred to

the output capacitor and load.

It is recommended that a low ESR (equivalent series

resistance) capacitor be used. Additionally, larger

values will lower the output resistance.

3.2 Ground (GND)

Input and output zero volt reference.

3.3 Charge Pump Capacitor (CAP-)

Negative connection for the charge pump capacitor, or

flying capacitor, used to transfer charge from the input

to the output. Proper orientation is imperative when

using a polarized capacitor.

The low voltage pin ensures proper operation of the

internal oscillator for input voltages below 3.5V. The low

voltage pin should be connected to ground (GND) for

input voltages below 3.5V. Otherwise, the low voltage

pin should be allowed to float.

3.6 Oscillator Control Input (OSC)

The oscillator control input can be utilized to slow down

or speed up the operation of the TC7660. Refer to

Section 5.4 “Changing the TC7660 Oscillator Fre-

quency”, for details on altering the oscillator

frequency.

3.7 Power Supply (V+)

Positive power supply input voltage connection. It is

recommended that a low ESR (equivalent series resis-

tance) capacitor be used to bypass the power supply

input to ground (GND).

3.4 Output Voltage (VOUT)

Negative connection for the charge pump output

capacitor. In the voltage-inverting configuration, the

charge pump output capacitor supplies the output load

during the first half of the switching cycle. During the

second half of the switching cycle, charge is restored to

the charge pump output capacitor.

It is recommended that a low ESR (equivalent series

resistance) capacitor be used. Additionally, larger

values will lower the output ripple.

 2002-2011 Microchip Technology Inc.

DS21465C-page 5

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