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TC1235

Inverting Dual (–VIN, –2VIN) Charge Pump Voltage Converters with Shutdown

Microchip Technology 

TC1235

TC1236

TC1237

Inverting Dual (–VIN, –2VIN)

Charge Pump Voltage Converters

with Shutdown

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

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.

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

= 0.33µF (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

ISHDN

VMIN

VMAX

FOSC

Supply Current

TC1235

TC1236

TC1237

Shutdown Supply Current All

Minimum Supply Voltage All

Maximum Supply Voltage All

Oscillator Frequency

TC1235

TC1236

TC1237

SHDN = VIN

SHDN = VIN

SHDN = VIN

SHDN = GND, VIN = +5V

RLOAD = 1kΩ for –VIN output

RLOAD = 10kΩ for –2VIN output

RLOAD = 1kΩ for –VIN output

RLOAD = 10kΩ for –2VIN output

—

75

—

200

—

625

—

0.1

1.8

—

—

—

8.4

12

24.5

35

65

125

VIH

Shutdown Input

All

VIN = VMIN to VMAX

Logic High

1.4

—

VIL

VEFF1

VEFF2

ROUT1

ROUT2

TWK1

Shutdown Input

Logic low

Voltage Conversion

Efficiency (Stage 1)

Voltage Conversion

Efficiency (Stage 2)

Output Resistance

for –VIN output (Note 1)

Output Resistance

for –2VIN output (Note 1)

Wake-Up Time

From Shutdown Mode

Stage 1

All

All

All

All

All

TC1235

TC1236

TC1237

VIN = VMIN to VMAX

RLOAD = ∞ for –VIN output

RLOAD = ∞ for –2VIN output

RLOAD = ∞ for –VIN output

RLOAD = ∞ for –2VIN output

ILOAD = 0.5mA to 5mA

No Load at -VIN Output

ILOAD = 0.1mA to 1mA

No Load at -2VIN Output

RLOAD = 1kΩ for -VIN Output

RLOAD = 10kΩ for -2VIN Output

—

—

96

99.5

94

99

—

45

—

135

—

650

—

250

—

100

TWK2

Wake-Up Time

From Shutdown Mode

Stage 2

TC1235

TC1236

TC1237

RLOAD = 1kΩ for -VIN Output

RLOAD = 10kΩ for -2VIN Output

—

750

—

280

—

120

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

120

360

1500

1

—

5.5

15.6

45.5

170

—

0.4

—

—

80

420

—

—

—

—

—

µA

µA

V

V

kHz

V

V

%

%

Ω

Ω

µsec

µsec

PIN DESCRIPTION

Pin Number

1

2

3

4

5

6

7

8

9

10

Name

C1–

C2+

NC

C2–

–2VIN

GND

VIN

SHDN

C1+

–VIN

Description

C1 Commutation Capacitor Negative Terminal.

C2 Commutation Capacitor Positive Terminal.

No Connection.

C2 Commutation Capacitor Negative Terminal.

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

Ground.

Positive Power Supply Input.

Shutdown Input (Active Low).

C1 Commutation Capacitor Positive Terminal.

Inverting Charge Pump Output (–1 x VIN).

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

2

© 2001 Microchip Technology Inc. DS21371A

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