MC1121

http://onsemi.com

2

PIN DESCRIPTION

Pin No.

Symbol

Description

1

FC

Frequency control for internal oscillator, FC = open, FOSC = 10kHz typ; FC = VDD, FOSC = 200kHz

typ, FC has no effect when OSC pin is driven externally

2

CAP+

Charge–pump capacitor, positive terminal

3

GND

Power–supply ground input

4

CAP–

Charge–pump capacitor, negative terminal

5

VOUT

Output, negative voltage

6

SHDN

Shutdown

7

OSC

Oscillator control input. An external capacitor can be added to slow the oscillator. Take care to

minimize stray capacitance. An external oscillator also may be connected to overdrive OSC

8

VDD

Power–supply positive voltage input

ABSOLUTE MAXIMUM RATINGS*

Parameter

Value

Unit

VDD Supply Voltage

6.0

V

Operating Temperature Range

–40 to +85

°C

OSC, FC, SHDN Input Voltage

–0.3 to (VDD + 0.3)

V

Output Short Circuit Duration

10

Sec

Storage Temperature Range

–65 to +150

°C

Package Power Dissipation (TA ≤ 70°C) Micro8

Derate by 4mW/

°C for TA > 70°C

333

mW

Lead Temperature (Soldering, 10 Seconds)

+300

°C

* Maximum Ratings are those values beyond which damage to the device may occur.

ELECTRICAL CHARACTERISTICS (TA = –40°C to +85°C, VDD = 5V ±10% COSC = OPEN, C1, C2 = 10µF, FC = VDD,

SHDN = VIH, unless otherwise noted. Typical values are at TA = 25°C.)

Symbol

Characteristic

Min

Typ

Max

Unit

IDD

Active Supply Current

RL = Open, FC = Open or GND

RL = Open, FC = VDD

—

—

50

0.6

100

1.0

µA

mA

IDD(SHDN)

Shutdown Supply Current (SHDN = 0V)

—

0.2

1.0

µA

VDD

Supply Voltage

2.4

—

5.5

V

VIH

SHDN Logic High Input Voltage

VDD x 0.8

—

—

V

VIL

SHDN Logic Low Input Voltage

—

—

0.4

V

IIN

Input Leakage Current

SHDN, OSC

FC Pin

–1.0

–4.0

—

—

1.0

4.0

µA

ROUT

Output Source Resistance (IOUT = 60 mA)

—

12

20

W

IOUT

Output Current (VOUT more negative than –3.75V)

60

100

—

mA

FOSC

Oscillator Frequency

OSC Open, FC = Open or GND

SHDN = VIH, FC = VDD

5.0

100

10

200

—

—

kHz

PEFF

Power Efficiency (FC = GND)

RL = 2kW between VDD and VOUT

RL = 1 kW between VOUT and GND

IL = 60 mA to GND

93

94

—

97

97

92

—

—

—

%

VEFF

Voltage Conversion Efficiency (RL = OPEN)

99

99.9

—

%