LTC1429CS8-4 datasheet(4/12 Pages) LINER

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LTC1429

TYPICAL PERFORMANCE CHARACTERISTICS

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

Supply Current vs Supply Voltage

Supply Current vs Temperature

TEMPERATURE (˚C)

700

LTC1429 • TPC05

400

200

100

800

600

500

300

VCC = 5V

DOUBLER MODE

VCC= 3.3V

TRIPLER MODE

VOUT = –4V

SUPPLY VOLTAGE (V)

3.0

600

800

1000

900

700

500

300

100

7.0

LTC1429 • TPC04

400

200

4.0

3.5

4.5

5.5

6.5

7.5

5.0

6.0

8.0

VOUT = –4V

TA = 25°C

TRIPLER MODE

DOUBLER MODE

PIN FUNCTIONS

Pin numbers are shown as (LTC1429CS/LTC1429CS8).

NC (Pin 1/NA): No Internal Connection.

C1+ (Pin 2/Pin 2): C1 Positive Input. Connect an 0.1

µF

capacitor between C1+ and C1–. With the LTC1429CS in

doubler mode, connect a 0.1

µF capacitor from C1+ to C2–.

C1– (Pin 3/Pin 3): C1 Negative Input. Connect a 0.1

µF

capacitor from C1+ to C1–. With the LTC1429CS in doubler

mode only, C1– should float.

C2+ (Pin 4/NA): C2 Positive Input. In tripler mode, connect

a 0.1

µF capacitor from C2+ to C2– . This pin is used with

the LTC1429CS in tripler mode only; in doubler mode, this

pin should float.

C2– (Pin 5/NA): C2 Negative Input. In tripler mode, con-

nect a 0.1

µF capacitor from C2+ to C2–. In doubler mode,

connect a 0.1

µF capacitor from C1+ to C2–.

GND (Pin 6/Pin 4): Ground. Connect to a low-impedance

ground. A ground plane will help to minimize regulation

errors.

R0 (Pin 7/NA): Internal Resistor String-1st Tap. See Table

3 in the Applications Information section for information

on internal resistor string pin connections vs output

voltage.

R1 (Pin 8/NA): Internal Resistor String-2nd Tap.

RADJ (Pin 9/NA): Internal Resistor String Output. Connect

this pin to ADJ to use the internal resistor divider. See

Table 3 in the Applications Information section for infor-

mation on internal resistor string pin connections vs

output voltage.

ADJ (COMP for fixed output versions) (Pin 10/Pin 5):

Output Adjust/Compensation. For adjustable parts, this

pin is used to set the output voltage. The output voltage

should be divided down with a resistor divider and fed

back to this pin to set the regulated output voltage. The

resistor divider can be external or the internal divider

string can be used if it can provide the required output

voltage. Typically the resistor string should draw

≥ 10µA

from the output to minimize errors due to the bias current

at the adjust pin. Fixed output parts have the internal

resistor string connected to this pin inside the package;

the pin can be used to trim the output voltage if desired. It

can also be used as an optional feedback compensation

pin to reduce output ripple on both adjustable and fixed

output voltage parts. See the Applications Information

section for more on compensation and output ripple.

OUT (Pin 11/Pin 6): Negative Voltage Output. This pin

must be bypassed to ground with a 1.0

µF or larger

capacitor; it must be at least 3.3

µF to provide specified

output ripple. The size of the output capacitor has a strong

INPUT FREQUENCY (kHz)

100

750

700

650

600

550

500

450

1000

2000

4000

LTC1429 • TPC06

TA = 25°C

ILOAD = 0mA

DOUBLER MODE

VCC = 5V

TRIPLER MODE

VCC = 3.3V

Supply Current vs

Input Frequency

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