TC1307 Datasheet, PDF(11/28 Page) Microchip Technology – Four-Channel CMOS LDO with Select Mode, Shutdown and Independent Reset

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TC1307 Datasheet, PDF (11/28 Pages) Microchip Technology – Four-Channel CMOS LDO with Select Mode, Shutdown and Independent Reset

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3.0 PIN DESCRIPTIONS

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

Name

Function

VDET

SHDN1

SELECT12

VIN

GND

SHDN3

VIN

SHDN4

SELECT34

VOUT4

VOUT3

VOUT2

VOUT1

SHDN2

RESET

Voltage Detect Input

Shutdown for VOUT1

Input for setting VOUT1 and VOUT2.

Input Voltage Connection

Ground connection

Shutdown for VOUT3

Input Voltage Connection

Shutdown for VOUT4

Input for setting VOUT3 and VOUT4.

LDO4 Output

LDO3 Output

LDO2 Output

LDO1 Output

Shutdown for VOUT2

Reset Output

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.

TC1307

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.

DS21702A-page 11

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