TC1307 datasheet(11/28 Pages) MICROCHIP

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 2002 Microchip Technology Inc.

DS21702A-page 11

TC1307

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

Pin Description Table.

3.1

Voltage Detect Input (VDET)

Input pin that is compared to internal threshold voltage

(typically 2.63V). When the VDET input is below the

2.63V threshold, the RESET output is held in its normal

low state. When the input voltage on the VDET pin rises

above the threshold voltage, the RESET output pin

remains low for 300 mS (Typical). After the delay, the

RESET pin changes to a logic high state.

3.2

Shutdown Control Input for VOUT1

(SHDN1)

LDO#1 output is enabled when a logic high is applied

to the SHDN1 input. LDO#1 output is disabled with a

logic low tied to the SHDN1 pin. When shutdown,

LDO#1 enters a low quiescent current state and the lin-

ear pass P-Channel MOSFET is off. The RESET out-

put remains valid and is independent of SHDN1.

3.3

SELECT Control Input for Setting

VOUT1 and VOUT2 (SELECT12)

Input pin used to select the output voltage of LDO#1

and LDO#2. When SELECT is tied to VIN, VOUT1 =

VOUT2 = 3.0V. When SELECT is tied to GND, VOUT1 =

VOUT2 = 2.5V. If the SELECT input is not connected,

VOUT1 = VOUT2 = 2.8V.

3.4

Input Voltage VIN

Connect input source to this pin. All VIN pins must be

tied together.

3.5

Ground (GND)

Connect this pin to the circuit ground. NOTE: This pin

does not carry high current and should be connected to

quiet circuit ground.

3.6

Shutdown Control Input for VOUT3

(SHDN3)

LDO#3 output is enabled when a logic high is applied

to the SHDN3 input. LDO#3 output is disabled with a

logic low tied to the SHDN3 pin. When shutdown,

LDO#3 enters a low quiescent current state and the lin-

ear pass P-Channel MOSFET is off. The RESET out-

put remains valid and is independent of SHDN3.

3.7

Shutdown Control Input for VOUT4

(SHDN4)

LDO#4 output is enabled when a logic high is applied

to the SHDN4 input. LDO#4 output is disabled with a

logic low tied to the SHDN4 pin. When shutdown,

LDO#4 enters a low quiescent current state and the lin-

ear pass P-Channel MOSFET is off. The RESET out-

put remains valid and is independent of SHDN4.

3.8

SELECT Control Input for Setting

VOUT3 and VOUT4 (SELECT34)

Input pin used to select the output voltage of LDO#3

and LDO#4. When SELECT is tied to VIN, VOUT3 =

VOUT4 = 2.8V. When SELECT is tied to GND, VOUT3 =

VOUT4 = 1.8V. If the SELECT input is not connected,

VOUT3 = VOUT4 = 2.5V.

3.9

Regulated Output Voltage #4 (VOUT4)

Output voltage selected by tri-state input SELECT34.

Output can be set to 1.80V, 2.50V or 2.80V

3.10

Regulated Output Voltage #3 (VOUT3)

Output voltage selected by tri-state input SELECT34.

Output can be set to 1.80V, 2.50V or 2.80V

3.11

Regulated Output Voltage #2 (VOUT2)

Output voltage selected by tri-state input SELECT12.

Output can be set to 2.50V, 2.80V or 3.00V

3.12

Regulated Output Voltage #1 (VOUT1)

Output voltage selected by tri-state input SELECT12.

Output can be set to 2.50V, 2.80V or 3.00V.

Name

Function

VDET

Voltage Detect Input

SHDN1

Shutdown for VOUT1

SELECT12

Input for setting VOUT1 and VOUT2.

VIN

Input Voltage Connection

VIN

Input Voltage Connection

GND

Ground connection

SHDN3

Shutdown for VOUT3

VIN

Input Voltage Connection

SHDN4

Shutdown for VOUT4

SELECT34

Input for setting VOUT3 and VOUT4.

VOUT4

LDO4 Output

VOUT3

LDO3 Output

VOUT2

LDO2 Output

VOUT1

LDO1 Output

SHDN2

Shutdown for VOUT2

RESET

Reset Output

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