LTC2801/LTC2802/

LTC2803/LTC2804



2801234fe

Pin FunctionS

Mode control

PIN NAME

PIN NUMBER

COMMENTS

2801

2802

2803

2804

2803-1

2804-1

3

5

5

Input Supply (1.8V-5.5V). Bypass to GND with a 1µF capacitor.

4

6

6

Generated Positive Supply Voltage for RS-232 Driver (7V). Connect a 1µF capacitor between

13*

17*

9

Generated Negative Supply Voltage for RS-232 Driver (–6.3V). Connect a 1µF capacitor

SW

5

7

7

GND

6

8

8

Ground.

CAP

7

9

10

Charge Pump Capacitor for Generated Negative Supply Voltage. Connect a 220nF capacitor

between CAP and SW.

10

12

12

Logic Supply (1.8V-5.5V) for the receiver outputs, driver inputs, and control inputs. This pin

TIN (T1IN, T2IN)

11

14, 13

TOUT (T1OUT, T2OUT)

2

3, 4

3, 4

RS-232 Driver Output(s).

RIN (R1IN, R2IN)

1

1, 2

1, 2

RS-232 Receiver Input(s). Includes internal 5kΩ termination resistor(s).

ROUT (R1OUT, R2OUT)

12

16, 15

high impedance in Shutdown mode, allowing data line sharing.

PS

8

10

—

MODE

9

11

—

ON/OFF

—

—

11

places both driver and receiver outputs in a high impedance state.

*Backside thermal pad

Table 1. LTC2801, LTC2802, LTC2803, LTC2804

MODE NAME

PS

MODE

RECEIVER

OUTPUT(S)

DC-DC

DRIVER

OUTPUT(S)

SHUTDOWN

L

L

HI-Z

OFF

HI-Z

1µA

1µA

RECEIVER(S) ACTIVE

L

H

ON

OFF

HI-Z

1µA

15µA

DRIVER(S) DISABLED

H

L

ON

ON

HI-Z

2.1mA

80µA OR

150µA

NORMAL

H

H

ON

ON

ON

2.3mA

80µA OR

150µA

Table 2. LTC2803-1, LTC2804-1

MODE NAME

ON/OFF

RECEIVER

OUTPUTS

DC-DC

DRIVER

OUTPUTS

SHUTDOWN

L

HI-Z

OFF

HI-Z

1µA

1µA

NORMAL

H

ON

ON

ON

2.3mA

150µA

*Typical currents for static drivers. Normal mode currents are for unloaded outputs.