Datasheet
LM25066I, LM25066IA
www.ti.com
SNVS824C –JUNE 2012–REVISED MARCH 2013
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 +85°C unless otherwise stated. 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 = 12V. See
(1)
and
Symbol Parameter Conditions Min Typ Max Unit
FB Pin
FB
TH
FB Threshold V
FB
rising 1.141 1.167 1.19 V
FB
HYS
FB Hysteresis Current -31 -24 -18 µA
FB
LEAK
Off Leakage Current V
FB
= 1V 1 µA
Power Limit (PWR Pin)
PWR
LIM
Power limit sense voltage (VIN-SENSE) SENSE-OUT = 12V, R
PWR
= 25 kΩ 9 12.5 15 mV
I
PWR
PWR pin current V
PWR
= 2.5V -10 µA
R
SAT(PWR)
PWR pin impedance when disabled UVLO = 0.7V 180 Ω
Gate Control (GATE Pin)
I
GATE
Source current Normal operation -28 -22 -16 µA
Fault Sink current UVLO = 1V 1.5 2 2.5 mA
POR Circuit Breaker sink current VIN - SENSE = 150 mV or VIN < R
POR
, 105 190 275 mA
V
GATE
= 5V
V
GATE
Gate output voltage in normal operation GATE voltage with respect to ground 17 18.8 20.3 V
OUT Pin
I
OUT-EN
OUT bias current, enabled OUT = VIN, normal operation 16 µA
I
OUT-DIS
OUT bias current, disabled
(2)
Disabled, OUT = 0V, SENSE = VIN -12 µA
Current Limit
V
CL
Threshold voltage CL = GND 22.5 25 27.5 mV
CL = GND, T
J
= 10°C to 85°C 23 25 27
CL = VDD 41 46 52
t
CL
Response time VIN-SENSE stepped from 0 mV to 80 mV 1.2 µs
I
SENSE
SENSE input current Enabled, SENSE = OUT 33 µA
Disabled, OUT = 0V 46
Enabled, OUT = 0V 45
Circuit Breaker
V
CB
Threshold voltage x 1.8 VIN - SENSE, CL = GND, CB = GND 35 45 55 mV
CB:CL Ratio CB = GND 1.6 1.8 2
V
CB
Threshold voltage x 3.6 VIN - SENSE, CL = GND, CB = VDD 70 90 110 mV
CB:CL Ratio CB = VDD 3.1 3.6 4
t
CB
Response time VIN - SENSE stepped from 0 mV to 150 0.6 1.2 µs
mV, time to GATE low, no load
Timer (TIMER pin)
V
TMRH
Upper threshold 1.54 1.7 1.85 V
V
TMRL
Lower threshold Restart cycles 0.85 1.0 1.07 V
End of 8
th
cycle 0.3 V
Re-enable threshold 0.3 V
I
TIMER
Insertion time current TIMER pin = 2V -8 -5.5 -3 µA
Sink current, end of insertion time 1.4 1.9 2.4 mA
Fault detection current -120 -90 -60 µA
Fault sink current 2.8 µA
DC
FAULT
Fault Restart Duty Cycle 0.67 %
t
FAULT_DELAY
Fault to GATE low delay TIMER pin reaches the upper threshold 17 µs
(2) OUT bias current (disabled) due to leakage current through an internal 0.9 MΩ resistance from SENSE to VOUT.
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