LTC1429CS8-4 datasheet(3/12 Pages) LINER

Part #	LTC1429CS8-4

Description	Clock-Synchronized Switched Capacitor Regulated Voltage Inverter

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Manufacturer	LINER [Linear Technology]

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LTC1429

ELECTRICAL CHARACTERISTICS

The q denotes specifications which apply over the full operating

temperature range.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2: Setting output to < – 7V will exceed the total voltage maximum

rating with a 5V supply. With supplies higher than 4V the output should

never be set to exceed (VCC – 12V).

Note 3: All currents into device pins are positive; all currents out of device

pins are negative. All voltages are referenced to ground, unless otherwise

specified. All typicals are given at TA = 25°C.

Note 4: C1 = C2 = 0.1

µF means the specifications apply to tripler mode

where VCC – VOUT = 3.3VCC (LTC1429CS only; the LTC1429CS8 cannot be

connected in tripler mode), with C1 connected between C1+ and C1– and

C2 connected between C2+ and C2–. C2 = 0 implies doubler mode where

VCC – VOUT = 2VCC; for the LTC1429CS, this means C1 connects from C1

+

to C2– with C1– and C2+ floating. For the LTC1429CS8 in doubler mode,

C1 connects from C1+ to C1– ; there are no C2 pins.

Note 5: Adjustable output parts only; does not apply to fixed output parts.

Note 6: For output voltages below – 4.5V, the LTC1429 may reach 50%

duty cycle and fall out of regulation with heavy load or low input voltages.

Beyond this point, the output will follow the input with no regulation.

Note 7: LTC1429 will operate with square wave of 40% to 60% duty cycle.

For best performance, use a square wave with 50% duty cycle.

Note 8: Maximum frequency is not tested. Typical part can be used

beyond 2MHz.

LTC1429CS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

∆VOUT

Output Regulation

– 1.24V

≥ VOUT ≥ –4V, 0 ≤ IOUT ≤ 12mA

q

15

%

– 4V

≥ VOUT ≥ –5V, 0 ≤ IOUT ≤ 8mA

q

25

%

ISC

Output Short Circuit Current

VOUT = 0V

q

35

75

mA

VRIP

Output Ripple Voltage

IOUT = 5mA, VOUT = – 4V

5

mV

Doubler Mode, VCC = 5V, C1 = 0.1µF, C2 = 0 (Note 4), COUT = 3.3µF, FSYNC =700kHz with 50% duty cycle, unless otherwise noted.

LTC1429CS8/LTC1429CS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

∆VOUT

Output Regulation

– 1.24V

≥ VOUT ≥ –4V, 0 ≤ IOUT ≤ 10mA

q

15

%

– 4V

≥ VOUT ≥ –4.5V, 0 ≤ IOUT ≤ 10mA (Note 6)

q

25

%

VOUT

Output Voltage

VOUT Set to – 4V, 0 ≤ IOUT ≤ 10mA

q

– 3.80

– 4.00

– 4.20

V

ISC

Output Short Circuit Current

VOUT = 0V

q

80

125

mA

VRIP

Output Ripple Voltage

IOUT = 5mA, VOUT = – 4V

10

mV

Tripler Mode,VCC = 3.3V, C1 = C2 = 0.1µF (Note 4), COUT = 3.3µF,

FSYNC = 700kHz with 50% duty cycle square wave, unless otherwise noted.

Maximum Output Current vs

Supply Voltage

TYPICAL PERFORMANCE CHARACTERISTICS

Output Voltage vs Output Current

Output Voltage vs Supply Voltage

OUTPUT CURRENT (mA)

0

–4.02

–4.06

–4.10

–4.08

–4.04

–4.00

–3.96

–3.92

8

LTC1429 • TPC01

–3.98

– 3.94

–3.90

2

135

79

4

6

10

TA = 25°C

VCC = 3.3V

TRIPLER MODE

VCC = 5V

DOUBLER MODE

SUPPLY VOLTAGE (V)

3.0

–4.04

–4.05

–4.06

7.0

LTC1429 • TPC02

–4.03

–4.02

–4.00

4.0

5.0

6.0

–4.01

–4.08

–4.07

3.5

4.5

5.5

6.5

DOUBLER MODE

IL = 5mA

TRIPLER MODE

IL = 5mA

TA = 25°C

SUPPLY VOLTAGE (V)

3.0

0

5

15

20

25

6.5

6.0

45

LTC1429 • TPC03

10

3.5

4.0

4.5

5.0

5.5

7.0

30

35

40

VOUT = –4V ± 5%

TA = 25°C

TRIPLER MODE

DOUBLER MODE

(See Test Circuits; Figure 1 for Doubler Mode, Figure 2 for Tripler Mode)

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