TC1235 datasheet(2/10 Pages) MICROCHIP

2 / 10 page

Inverting Dual (–VIN, –2VIN)

Charge Pump Voltage Converters

with Shutdown

TC1235

TC1236

TC1237

TC1235/6/7-1 3/24/00

DS21371A

Power Dissipation (TA ≤ 70°C) MSOP-10 ............. 320mW

Storage Temperature (Unbiased) ......... – 65

°C to +150°C

Lead Temperature (Soldering, 10sec) .................. +260

°C

*This is a stress rating 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.

ABSOLUTE MAXIMUM RATINGS*

Input Voltage (VIN to GND) ......................... +6.0V, – 0.3V

Output Voltage (–VIN, –2VIN to GND) ........ –12.0V, + 0.3V

Current at –VIN, –2VIN Pins ...................................... 10mA

Short-Circuit Duration –VIN, –2VIN to GND ........ Indefinite

Operating Temperature Range ............... – 40

°C to +85°C

PIN DESCRIPTION

Pin Number

Name

Description

1C1–

C1 Commutation Capacitor Negative Terminal.

C2+

C2 Commutation Capacitor Positive Terminal.

No Connection.

4C2–

C2 Commutation Capacitor Negative Terminal.

–2VIN

Doubling Inverting Charge Pump Output (–2 x VIN).

GND

Ground.

7VIN

Positive Power Supply Input.

SHDN

Shutdown Input (Active Low).

C1+

C1 Commutation Capacitor Positive Terminal.

–VIN

Inverting Charge Pump Output (–1 x VIN).

NOTES: 1. Capacitor contribution is approximately 20% of the output impedance [ESR = 1 / pump frequency x capacitance)].

ELECTRICAL CHARACTERISTICS: TA = –40°C to +85°C, VIN = +5V, C1 = 3.3µF, C2 = 1µF (TC1235); C1 = 1µF, C2

= 0.33

µF (TC1236); C1 = 0.33µF, C2 = 0.1µF (TC1237), SHDN = VIN, unless otherwise noted. Typical values are at TA = +25°C.

Symbol Parameter

Device

Test Conditions

Min

Typ

Max

Unit

IDD

Supply Current

TC1235

SHDN = VIN

—

120

µA

TC1236

SHDN = VIN

—

200

360

TC1237

SHDN = VIN

—

625

1500

ISHDN

Shutdown Supply Current All

SHDN = GND, VIN = +5V

—

0.1

µA

VMIN

Minimum Supply Voltage All

RLOAD = 1kΩ for –VIN output

1.8

——

RLOAD = 10kΩ for –2VIN output

VMAX

Maximum Supply Voltage All

RLOAD = 1kΩ for –VIN output

——

5.5

RLOAD = 10kΩ for –2VIN output

FOSC

Oscillator Frequency

TC1235

8.4

15.6

kHz

TC1236

24.5

45.5

TC1237

125

170

VIH

Shutdown Input

All

VIN = VMIN to VMAX

1.4

——

Logic High

VIL

Shutdown Input

All

VIN = VMIN to VMAX

——

0.4

Logic low

VEFF1

Voltage Conversion

All

RLOAD = ∞ for –VIN output

99.5

—

Efficiency (Stage 1)

RLOAD = ∞ for –2VIN output

VEFF2

Voltage Conversion

All

RLOAD = ∞ for –VIN output

—

Efficiency (Stage 2)

RLOAD = ∞ for –2VIN output

ROUT1

Output Resistance

All

ILOAD = 0.5mA to 5mA

—

Ω

for –VIN output (Note 1)

No Load at -VIN Output

ROUT2

Output Resistance

All

ILOAD = 0.1mA to 1mA

—

135

420

Ω

for –2VIN output (Note 1)

No Load at -2VIN Output

TWK1

Wake-Up Time

TC1235

RLOAD = 1kΩ for -VIN Output

—

650

—

µsec

From Shutdown Mode

TC1236

RLOAD = 10kΩ for -2VIN Output

—

250

—

Stage 1

TC1237

—

100

—

TWK2

Wake-Up Time

TC1235

RLOAD = 1kΩ for -VIN Output

—

750

—

µsec

From Shutdown Mode

TC1236

RLOAD = 10kΩ for -2VIN Output

—

280

—

Stage 2

TC1237

—

120

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