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TC1240

Positive Doubling Charge Pump with Shutdown in SOT Package

TelCom Semiconductor Inc => Microchip 

Positive Doubling Charge Pump with

Shutdown in SOT Package

TC1240

ABSOLUTE MAXIMUM RATINGS*

Input Voltage (VIN to GND) .......................... +4.5V, –0.3V

Output Voltage (OUT to GND) .............. +9.0V, VIN – 0.3V

Current at OUT Pin ................................................. 50 mA

Short-Circuit Duration –OUT to GND ................ Indefinite

Operating Temperature Range ...............–40 °C to +85°C

Power Dissipation (TA ≤ 70°C)

6-Pin SOT-23A ..........................................240 mW

Storage Temperature (Unbiased) ......... –65 °C to +150°C

Lead Temperature (Soldering, 10 sec) ................. +300°C

*Static-sensitive device. Unused devices must be stored in conductive

material. Protect devices from static discharge and static fields. Stresses

above those listed under Absolute Maximum Ratings may cause perma-

nent 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 operational sections of the specifications is not implied.

Exposure to Absolute Maximum Rating Conditions for extended periods

may affect device reliability.

ELECTRICAL CHARACTERISTICS: TA = –40 to +85 °C, VIN = +2.8V, C1 = C2 = 3.3µF , SHDN = GND,

unless otherwise noted. Typical values are at TA = +25°C.

Symbol

Parameter

Test Conditions

Min

Typ

IDD

Supply Current

RLOAD = ∞

—

180

ISHDN

Shutdown Supply Current

SHDN = VIN

—

0.1

VMIN

VMAX

FOSC

Minimum Supply Voltage

Maximum Supply Voltage

Oscillator Frequency

RLOAD = 1.0KΩ

RLOAD = 1.0KΩ

TA = –40 °C to +85°C

2.5

—

—

—

—

160

FSW

Switching Frequency

TA = –40 °C to +85°C

40

80

VIH

Shutdown Input Logic High

VIN = VMIN to VMAX

1.4

—

VIL

PEFF

VEFF

Shutdown Input Logic Low

Power Efficiency

Voltage Conversion

Efficiency

VIN = VMIN to VMAX

RLOAD = 1.0KΩ

RLOAD = ∞

—

—

86

93

97.5

99.96

ROUT

Output Resistance

(Note 1)

RLOAD = 1.0KΩ

TA = –40°C to +85°C

—

17

—

—

NOTE: 1. Capacitor contribution is approximately 26% of the output impedance [ESR = 1 / pump frequency x capacitance)].

2. Switching frequency is one-half internal oscillator frequency.

Max

300

1.0

—

4.0

—

125

—

0.4

—

—

—

30

Units

µA

µA

V

V

kHz

kHz

V

V

%

%

Ω

PIN DESCRIPTION

Pin No.

(6-Pin SOT-23A)

1

2

3

4

5

6

Symbol

VIN

GND

C–

SHDN

OUT

C+

Description

Power Supply Input.

Ground.

Commutation Capacitor Negative Terminal.

Shutdown Input (Active High).

Doubled Output Voltage.

Commutation Capacitor Positive Terminal.

TC1240-1 7/7/00

2

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