LTC1429 データシートの表示（PDF） - Linear Technology

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LTC1429

Clock-Synchronized Switched Capacitor Regulated Voltage Inverter

Linear Technology 

LTC1429

TYPICAL PERFORMANCE CHARACTERISTICS

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

Supply Current vs Supply Voltage

1000

900

800

VOUT = –4V

TA = 25°C

TRIPLER MODE

700

600

DOUBLER MODE

500

400

300

200

100

0

3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0

SUPPLY VOLTAGE (V)

LTC1429 • TPC04

Supply Current vs Temperature

800

VCC = 5V

700

DOUBLER MODE

600

VCC= 3.3V

500

TRIPLER MODE

400

300

200

100 VOUT = –4V

0

0 10 20 30 40 50 60 70

TEMPERATURE (˚C)

LTC1429 • TPC05

Supply Current vs

Input Frequency

750

TA = 25°C

700 ILOAD = 0mA

650

TRIPLER MODE

600 VCC = 3.3V

550

500

DOUBLER MODE

VCC = 5V

450

100

1000 2000 4000

INPUT FREQUENCY (kHz)

LTC1429 • TPC06

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 0.1µF

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

doubler mode, connect a 0.1µF capacitor from C1+ to C2–.

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

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 0.1µF 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 0.1µF capacitor from C2+ to C2–. In doubler mode,

connect a 0.1µF 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 1.0µF or larger

capacitor; it must be at least 3.3µF to provide specified

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

4

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