Datasheet

LM5069
SNVS452D –SEPTEMBER 2006–REVISED MAY 2013 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Limits in standard type are for T
J
= 25°C only; limits in boldface type apply over the junction temperature (T
J
) range of -40°C
to +125°C. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent
the most likely parametric norm at T
J
= 25°C, and are provided for reference purposes only. Unless otherwise stated the
following conditions apply: VIN = 48V.
Symbol Parameter Conditions Min. Typ. Max. Units
OVLO
DEL
OVLO delay Delay to GATE high 55 µs
Delay to GATE low 11
OVLO
BIAS
OVLO bias current OVLO = 2.4V 1 µA
Power Limit (PWR pin)
PWR
LIM-1
Power limit sense voltage (VIN-SENSE) SENSE-OUT = 48V, R
PWR
= 150 kΩ 19 25 31 mV
PWR
LIM-2
SENSE-OUT = 24V, R
PWR
= 75 kΩ 25 mV
I
PWR
PWR pin current V
PWR
= 2.5V 20 µA
Gate Control (GATE pin)
I
GATE
Source current Normal Operation, GATE-OUT = 5V 10 16 22 µA
Sink current UVLO < 2.5V 1.75 2 2.6 mA
VIN - SENSE = 150 mV or VIN < 45 110 175 mA
POR
IT
, V
GATE
= 5V
V
GATE
Gate output voltage in normal operation GATE-OUT voltage 11.4 12 12.6 V
Current Limit
V
CL
Threshold voltage VIN-SENSE voltage 48.5 55 61.5 mV
t
CL
Response time VIN-SENSE stepped from 0 mV to 45 µs
80 mV
I
SENSE
SENSE input current Enabled, SENSE = OUT 23 µA
Disabled, OUT = 0V 60
Circuit Breaker
V
CB
Threshold voltage VIN - SENSE 80 105 130 mV
t
CB
Response time VIN - SENSE stepped from 0 mV to 0.44 1.2 µs
150 mV, time to GATE low, no load
Timer (TIMER pin)
V
TMRH
Upper threshold 3.76 4 4.16 V
V
TMRL
Lower threshold Restart cycles (LM5069-2) 1.187 1.25 1.313 V
End of 8th cycle (LM5069-2) 0.3 V
Re-enable Threshold (LM5069-1) 0.3 V
I
TIMER
Insertion time current 3 5.5 8 µA
Sink current, end of insertion time TIMER pin = 2V 1.0 1.5 2.0 mA
Fault detection current 51 85 120 µA
Fault sink current 1.25 2.5 3.75 µA
DC
FAULT
Fault Restart Duty Cycle LM5069-2 only 0.5 %
t
FAULT
Fault to GATE low delay TIMER pin reaches 4.0V 12 µs
Power Good (PGD pin)
PGD
TH
Threshold measured at SENSE-OUT Decreasing 0.67 1.25 1.85 V
Increasing, relative to decreasing 0.95 1.25 1.55
threshold
PGD
VOL
Output low voltage I
SINK
= 2 mA 60 150 mV
PGD
IOH
Off leakage current V
PGD
= 80V 5 µA
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