LTC3230 datasheet(11/16 Pages) LINER

Part #	LTC3230

Description	5-LED Main/Sub Display Driver with Dual LDO

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Manufacturer	LINER [Linear Technology]

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LTC3230

11

3230fa

OPERATION

charge pump function. Driving ENLDO1 and ENLDO2 high

enable LDO1 and LDO2 respectively. When the charge

pump is enabled, each LDO consumes an additional 60μA

(typical) from VIN. If the charge pump is not enabled, one

LDO consumes 125μA (typical) and the second uses 60μA

(typical) additional current.

LDO output voltage is set using three-level input pins V1

and V2 as shown in Table 2.

Table 2. LDO1 and LDO2 Output Voltage Control

V1

GND

FLOAT

VIN

LDO1 (V)

1.2

1.5

1.8

V2

GND

FLOAT

VIN

LDO2 (V)

1.8

2.8

3.3

The reference input to each LDO is ramped when enabled

to provide an output soft-start lasting typically 100μs.

When an LDO is disabled its output is pulled to ground

through an 11.5k resistor.

Shutdown Current

In shutdown mode all the circuitry is turned off and the

LTC3230 draws a very low current from the VIN supply.

When in shutdown, CPO is disconnected from VIN and is

pulled to ground through a 14.3k resistor. The LTC3230

enters shutdown mode when both ENM and ENS pins

are brought low for 250μs (minimum) and ENLDO1 and

ENLDO2 are brought low. All enable pins ENM, ENS, EN-

LDO1 and ENLDO2 have internal pull-downs to deﬁne the

shutdown state whenever the inputs are ﬂoating.

Figure 3. Typical 1.5x ROL vs Temperature

Figure 4. Typical 2x ROL vs Temperature

TEMPERATURE (

°C)

–40

5

6

7

8

9

10

11

–15

10

35

60

3230 G06

85

VIN = 3V

VCPO = 4.2V

C1 = C2 = C6 = 1

μF

TEMPERATURE (

°C)

–40

6

7

8

9

10

11

12

–15

10

35

60

3230 G08

85

VIN = 3V

VCPO = 4.8V

C1 = C2 = C6 = 1

μF

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