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ADM1075-2ARUZ

−48 V Hot Swap Controller and Digital Power Monitor with PMBus Interface

Analog Devices 

Data Sheet

PIN CONFIGURATION AND FUNCTION DESCRIPTION

ADM1075

DRAIN 1

VIN 2

UVH 3

UVL 4

OV 5

PLIM 6

VCAP 7

ADC_V 8

ISET 9

SS 10

TIMER 11

LATCH 12

ADR 13

SHDN 14

ADM1075

TOP VIEW

(Not to Scale)

28 VEE_G

27 GATE

26 SENSE+

25 SENSE–

24 VEE

23 SPLYGD

22 ADC_AUX

21 PWRGD

20 SCL

19 SDAI

18 SDAO

17 GPO2/ALERT2

16 GPO1/ALERT1/CONV

15 RESTART

Figure 3. TSSOP Pin Configuration

OV 1

PLIM 2

VCAP 3

ADC_V 4

ISET 5

SS 6

TIMER 7

ADM1075

TOP VIEW

(Not to Scale)

21 SENSE–

20 VEE

19 SPLYGD

18 ADC_AUX

17 PWRGD

16 SCL

15 SDAI

NOTES

1. EXPOSED PAD. SOLDER THE EXPOSED PAD TO THE BOARD TO

IMPROVE THERMAL DISSIPATION. THE EXPOSED PAD CAN BE

CONNECTED TO VEE.

Figure 4. LFCSP Pin Configuration

Table 5. Pin Function Descriptions

Pin No.

TSSOP LFCSP Mnemonic

Description

1

25

DRAIN

Connect to the drain pin of the FET through a resistor. The current in this resistor is used to determine

the VDS of the MOSFET. This is used for PWRGD.

2

26

VIN

Shunt Regulated Positive Supply to Chip. Connect to the positive supply rail via a shunt resistor. A

1 μF capacitor to VEE is recommended on the VIN pin.

3

27

UVH

Undervoltage Rising Input Pin. An external resistor divider is used from the supply to this pin to allow

an internal comparator to detect if the supply is under the UVH limit.

4

28

UVL

Undervoltage Falling Input Pin. An external resistor divider is used from the supply to this pin to

allow an internal comparator to detect if the supply is under the UVL limit.

5

1

OV

Overvoltage Input Pin. An external resistor divider is used from the supply to this pin to allow an

internal comparator to detect if the supply is above the OV limit.

6

2

PLIM

The voltage on this pin is proportional to the VDS voltage of the FET. As the PLIM voltage changes, the

current limit automatically adjusts to maintain constant power across the FET.

7

3

VCAP

A capacitor with a value of 1 μF or greater should be placed on this pin to maintain good accuracy.

This is an internal regulated supply. This pin can be used as a reference to program the ISET pin

voltage.

8

4

ADC_V

This pin is used to read back the input voltage using the internal ADC. It can be connected to the OV

string or a separate divider.

9

5

ISET

This pin allows the current limit threshold to be programmed. The default limit is set when this pin is

connected directly to VCAP. Alternatively, using a resistor divider from VCAP, the current limit can be

adjusted to achieve a user defined sense voltage. An external reference can also be used.

10

6

SS

A capacitor is used on this pin to set the inrush current soft start ramp profile. The voltage on the soft

start pin controls the current sense voltage limit, allowing control over the inrush current profile.

11

7

TIMER

Timer Pin. An external capacitor, CTIMER, sets an initial timing cycle delay and a fault delay. The GATE

pin turns off when the voltage on the TIMER pin exceeds the upper threshold.

12

8

LATCH

This pin signals the device latching off after an overcurrent fault. This pin is also used to configure the

desired retry scheme. See the Hot Swap Fault Retry section for additional details.

13

9

ADR

PMBus Address Pin. This pin can be tied low, tied to VCAP, left floating, or tied low through a resistor

to set four different PMBus addresses.

Rev. D | Page 11 of 52

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