lm25066apsqx National Semiconductor Corporation, lm25066apsqx Datasheet - Page 3

• Manufacturer Part Number: lm25066apsqx
• Description: Lm25066a System Power Management And Protection Ic With Pmbus
• Manufacturer: National Semiconductor Corporation

Pad
Pin
No.
10
11
12
13
14
15
16
17
18
19
20
21
Ordering Information
Pin Descriptions
1
2
3
4
5
6
7
8
9
LM25066APSQE
LM25066APSQX
UVLO/EN
LM25066APSQ
Order Number
Exposed
RETRY
SENSE
TIMER
OVLO
SMBA
Name
ADR2
ADR1
ADR0
GATE
PWR
GND
VDD
PGD
OUT
SDA
SCL
Pad
VIN
CB
CL
FB
SMBUS address line 2
SMBUS address line 1
SMBUS address line 0
Power Good feedback
Under-voltage lockout
Internal sub-regulator
Power Good indicator
Circuit breaker range
Positive supply input
Over-voltage lockout
Exposed pad of LLP
Current sense input
Current limit range
Gate drive output
Timing capacitor
Output feedback
SMBus alert line
SMBus data pin
Fault retry input
Power limit set
Circuit ground
SMBus clock
Description
package.
output
Package Type
LLP-24
LLP-24
LLP-24
Applications Information
No internal electrical connections. Solder to the ground plane to reduce thermal
resistance
3 - state address line. Should be connected to GND, VDD, or left floating.
3 - state address line. Should be connected to GND, VDD, or left floating.
3 - state address line. Should be connected to GND, VDD, or left floating.
Internally sub-regulated 4.5V bias supply. Connect a 1 µF capacitor on this pin to ground
for bypassing.
Connect this pin to GND to set the nominal over-current threshold at 25mV. Connecting
CL to VDD will set the over-current threshold to be 46mV.
This pin sets the circuit breaker protection point in relation to the over current trip point.
When connected to GND, this pin will set the circuit breaker point to be 1.8 times the
over current threshold. Connecting this pin to VDD sets the circuit breaker trip point to
be 3.6 times the over current threshold.
An external resistor divider from the output sets the output voltage at which the PGD pin
switches. The threshold at the pin is 1.167V. An internal 24 µA current source provides
hysteresis.
This pin configures the power up fault retry behavior. When this pin is grounded, the
device will continually try to engage power during a fault. If the pin is connected to VDD,
the device will latch off during a fault.
An external capacitor connected to this pin sets the insertion time delay, fault timeout
period and restart timing.
An external resistor connected to this pin, in conjunction with the current sense resistor
(R
An open drain output. This output is high when the voltage at the FB pin is above 1.167V
and the input supply is within its under voltage and over voltage thresholds. Connect to
the output rail (external MOSFET source) or any other voltage to be monitored.
Connect to the output rail (external MOSFET source). Internally used to determine the
MOSFET V
Connect to the external MOSFET's gate.
The voltage across the current sense resistor (R
the voltage across R
fault timer activates.
A small ceramic bypass capacitor close to this pin is recommended to suppress
transients which occur when the load current is switched off.
An external resistor divider from the system input voltage sets the under-voltage turn-
on threshold. An internal 23 µA current source provides hysteresis. The enable threshold
at the pin is 1.16V. This pin can also be used for remote shutdown control.
An external resistor divider from the system input voltage sets the over-voltage turn-off
threshold. An internal 23 µA current source provides hysteresis. The disable threshold
at the pin is 1.16V.
Data pin for SMBus.
Clock pin for SMBus.
Alert pin for SMBus.
S
), sets the maximum power dissipation allowed in the external series pass MOSFET.
DS
voltage for power limiting, and to monitor the output voltage.
3
S
reaches over current threshold the load current is limited and the
Package Drawing
SQA24B
SQA24B
SQA24B
S
) is measured from VIN to this pin. If
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