ADM1075-1ACPZ AD [Analog Devices], ADM1075-1ACPZ Datasheet - Page 11

• Manufacturer Part Number: ADM1075-1ACPZ
• Description: ?48 V Hot Swap Controller and Digital
• Manufacturer: AD [Analog Devices]

Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTION
Table 5. Pin Function Descriptions
TSSOP
1
2
3
4
5
6
7
8
9
10
11
12
13
Pin No.
ADC_V
LATCH
DRAIN
TIMER
SHDN
VCAP
PLIM
ISET
ADR
UVH
UVL
VIN
OV
SS
LFCSP
25
26
27
28
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
(Not to Scale)
Figure 3. TSSOP Pin Configuration
ADM1075
TOP VIEW
Mnemonic
DRAIN
VIN
UVH
UVL
OV
PLIM
VCAP
ADC_V
ISET
SS
TIMER
LATCH
ADR
24
18
17
16
15
28
27
26
25
23
22
21
20
19
VEE_G
GATE
SENSE+
SENSE–
VEE
SPLYGD
ADC_AUX
PWRGD
SCL
SDAI
SDAO
GPO2/ALERT2
GPO1/ALERT1/CONV
RESTART
Description
Connect to the drain pin of the FET through a resistor. The current in this resistor is used to
determine the V
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.
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.
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.
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.
The voltage on this pin is proportional to the V
the current limit automatically adjusts to maintain constant power across the FET.
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.
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.
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.
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.
Timer Pin. An external capacitor, C
pin turns off when the voltage on the TIMER pin exceeds the upper threshold.
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.
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.
DS
of the MOSFET. This is used for
Rev. A | Page 11 of 52
TIMER
, sets an initial timing cycle delay and a fault delay. The GATE
NOTES
1. EXPOSED PAD. SOLDER THE EXPOSED PAD TO THE BOARD TO
IMPROVE THERMAL DISSIPATION. THE EXPOSED PAD CAN BE
CONNECTED TO VEE.
DS
ADC_V
TIMER
VCAP
voltage of the FET. As the PLIM voltage changes,
PLIM
PWRGD
ISET
OV
SS
Figure 4. LFCSP Pin Configuration
1
2
3
4
5
6
7
.
(Not to Scale)
ADM1075
TOP VIEW
21 SENSE–
20 VEE
19 SPLYGD
18 ADC_AUX
17 PWRGD
16 SCL
15 SDAI
ADM1075