LM25066APSQE/NOPB National Semiconductor, LM25066APSQE/NOPB Datasheet - Page 35

• Manufacturer Part Number: LM25066APSQE/NOPB
• Description: IC CTLR PM HOTSWAP 24-LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM25066APSQE/NOPB

• Applications: Base Station-Networking Line Cards, Servers
• Current - Supply: 5.8mA
• Voltage - Supply: 2.9 V ~ 17 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: *
• Package / Case: *
• Input Voltage: 17V
• Internal Switch: No
• Supply Voltage Range: 2.9V To 5.5V
• Rohs Compliant: Yes
• Digital Ic Case Style: LLP
• No. Of Pins: 24
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM25066APSQE/NOPBTR

The IIN/PFET Fault refers to the input current fault and the
MOSFET power dissipation fault. There is no input power fault
detection, only input power warning detection.
MFR_SPECIFIC_09: DEVICE_SETUP (D9h)
The DEVICE_SETUP command may be used to override pin
settings to define operation of the LM25066A under host con-
trol. This command is accessed with the PMBus™ read / write
byte protocol.
TABLE 28. MFR_SPECIFIC_07 GATE MASK Definitions
7:5
Bit
4
Bit
7
6
5
4
3
2
1
0
TABLE 30. DEVICE_SETUP Byte Format
Current limit setting
Retry setting
Name
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CIRCUIT BREAKER
OVERTEMP FAULT
Not used, always 0
Not used, always 0
Not used, always 0
IIN/PFET FAULT
VIN UV FAULT
VIN OV FAULT
FAULT
NAME
000 = Pin configured retries
1 = High setting (46mV)
0 = Low setting (25mV)
111 = Unlimited retries
110 = Retry 16 times
101 = Retry 8 times
100 = Retry 4 times
011 = Retry 2 times
010 = Retry 1 time
001 = No retries
Meaning
TABLE 29. ALERT_MASK Definitions
CML FAULT (Communications Fault)
Default
VOUT UNDERVOLTAGE WARN
OVERTEMPERATURE FAULT
VIN UNDERVOLTAGE WARN
VIN UNDERVOLTAGE FAULT
VIN OVERVOLTAGE FAULT
VIN OVERVOLTAGE WARN
OVERPOWER LIMIT WARN
CIRCUIT BREAKER FAULT
EXT_MOSFET_SHORTED
0
0
0
0
0
0
0
0
OVERTEMP WARN
IIN/PFET FAULT
POWER GOOD
IIN LIMIT Warn
Not Used
Not Used
NAME
35
MFR_SPECIFIC_08: ALERT_MASK (D8h)
The ALERT_MASK command is used to mask the SMBA
when a specific fault or warning has occurred. Each bit cor-
responds to one of the 14 different analog and digital faults or
warnings that would normally result in an SMBA being set.
When the corresponding bit is high, that condition will not
cause the SMBA to be asserted. If that condition occurs, the
registers where that condition is captured will still be updated
(STATUS registers, DIAGNOSTIC_WORD) and the external
MOSFET gate control will still be active (VIN_OV_FAULT,
VIN_UV_FAULT,
OT_FAULT). This register is accessed with the PMBus™
Read / Write Word protocol. The VIN UNDERVOLTGE
FAULT flag will default to 1 on startup. However, it will be
cleared to 0 after the first time the input voltage exceeds the
resistor programmed UVLO threshold.
In order to configure the Current Limit Setting via this register,
it is necessary to set the Current Limit Configuration bit (2) to
1 to enable the register to control the current limit function and
the Current Limit Setting bit (4) to select the desired setting.
Similarly, in order to control the Circuit Breaker via this regis-
ter, it is necessary to set the Circuit Breaker Configuration bit
(1) to 1 to enable the register to control the Circuit Breaker
Setting, and the Circuit Breaker / Current Limit Ratio bit (3) to
the desired value. If the respective Configuration bits are not
set, the Settings will be ignored and the pin set values used.
The Current Limit Configuration effects the coefficients used
for the Current and Power measurements and warning reg-
isters.
Bit
3
2
1
0
Circuit breaker
Configuration
Configuration
CB/CL Ratio
Current limit
Unused
Name
IIN/PFET_FAULT,
1 = Use SMBus settings
1 = Use SMBus settings
1 = High setting (3.6x)
0 = Low setting (1.8x)
DEFAULT
0 = Use pin settings
0 = Use pin settings
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
Meaning
CB_FAULT,
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