Datasheet
LM25011, LM25011-Q1
SNVS617G –APRIL 2009–REVISED FEBRUARY 2013
www.ti.com
ELECTRICAL CHARACTERISTICS
Specifications with standard type are for T
J
= 25°C only; limits in boldface type apply over the full Operating Junction
Temperature (T
J
) range. Minimum and Maximum limits are guaranteed 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: V
IN
= 12V, R
T
= 50 kΩ.
Symbol Parameter Conditions Min Typ Max Unit
Input (VIN Pin)
I
IN
Input operating current Non-switching, FB = 3V 1200 1600 µA
UVLO
VIN
VIN under-voltage lock-out threshold VIN Increasing 4.6 5.3 5.9 V
VIN under-voltage lock-out threshold 200 mV
hysteresis
Switch Characteristics
R
DS(ON)
Buck Switch R
DS(ON)
I
TEST
= 200 mA 0.3 0.6 Ω
UVLO
GD
Gate Drive UVLO BST-SW 2.4 3.4 4.4 V
UVLO
GD
Hysteresis 350 mV
Pre-charge switch voltage I
TEST
= 10 mA into SW pin 1.4 V
Pre-charge switch on-time 120 ns
Soft-Start Pin
V
SS
Pull-up voltage 2.51 V
I
SS
Internal current source 10 µA
V
SS-SH
Shutdown Threshold 70 140 mV
Current Limit
V
ILIM
Threshold voltage at CS -146 -130 -115 mV
CS bias current FB = 3V -120 µA
CSG bias current FB = 3V -35 µA
On Timer, RT Pin
t
ON
- 1 On-time V
IN
= 12V, R
T
= 50 kΩ 150 200 250 ns
t
ON
- 2 On-time V
IN
= 32V, R
T
= 50 kΩ 75 ns
t
ON
- 3 On-time (current limit) LM25011 V
IN
= 12V, R
T
= 50 kΩ 100 ns
t
ON
- 3 On-time (current limit) LM25011A V
IN
= 12V, R
T
= 50 kΩ 200 ns
t
ON
- 4 On-time V
IN
= 12V, R
T
= 301 kΩ 1020 ns
t
ON
- 5 On-time V
IN
= 9V, R
T
= 30.9 kΩ 130 171 215 ns
t
ON
- 6 On-time V
IN
= 12V, R
T
= 30.9 kΩ 105 137 170 ns
t
ON
- 7 On-time V
IN
= 16V, R
T
= 30.9 kΩ 79 109 142 ns
Off Timer
t
OFF
Minimum Off-time (LM25011) 90 150 208 ns
Minimum Off-time (LM25011A) 52 75 93
Regulation Comparator (FB Pin)
V
REF
FB regulation threshold SS pin = steady state 2.46 2.51 2.56 V
FB bias current FB = 3V 100 nA
Power Good (PGD pin)
Threshold at FB, with respect to V
REF
FB increasing 91 95 %
Threshold hysteresis 3.3 %
PGD
VOL
Low state voltage I
PGD
= 1mA, FB = 0V 125 180 mV
PGD
LKG
Off state leakage V
PGD
= 7V, FB = 3V 0.1 µA
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