Datasheet

LM25117
LM25117-Q1
www.ti.com SNVS714E –APRIL 2011–REVISED MARCH 2013
Electrical Characteristics
Limits in standard type are for T
J
= 25°C only; limits in boldface type apply over the junction temperature range of -40°C to
+125°C. Typical values represent the most likely parametric norm at T
J
= 25°C, and are provided for reference purposes only.
Unless otherwise specified, the following conditions apply: V
VIN
= 24V, V
VCCDIS
= 0V, R
T
= 25kΩ, no load on LO & HO.
Symbol Parameter Test Conditions Min Typ Max Unit
VIN Supply
I
BIAS
VIN Operating Current
(1)
V
SS
= 0V 4.8 6.2 mA
V
SS
= 0V, V
VCCDIS
= 2V 0.4 0.55 mA
I
SHUTDOWN
VIN Shutdown Current V
SS
= 0V, V
UVLO
= 0V 16 40 µA
VCC Regulator
V
CC(REG)
VCC Regulation No Load 6.85 7.6 8.2 V
VCC Dropout (VIN to VCC) V
VIN
= 4.5V, No external load 0.05 0.14 V
V
VIN
= 5.0V, I
CC
= 20mA 0.4 0.5 V
VCC Sourcing Current Limit V
VCC
= 0V 30 42 mA
I
VCC
VCC Operating Current
(1)
V
SS
= 0V, V
VCCDIS
= 2V 4.0 5.0 mA
V
SS
= 0V, V
VCCDIS
= 2V, V
VCC
= 14V 5.8 7.3 mA
VCC Under-voltage Threshold VCC Rising 3.75 4.0 4.15 V
VCC Under-voltage Hysteresis 0.2 V
VCC Disable
VCCDIS Threshold VCCDIS Rising 1.22 1.25 1.29 V
VCCDIS Hysteresis 0.06 V
VCCDIS Input Current V
VCCDIS
= 0V -20 nA
VCCDIS Pull-down Resistance 500 kΩ
UVLO
UVLO Threshold UVLO Rising 1.22 1.25 1.29 V
UVLO Hysteresis Current V
UVLO
= 1.4V 15 20 25 µA
UVLO Shutdown Threshold UVLO Falling 0.23 0.3 V
UVLO Shutdown Hysteresis 0.1 V
Soft Start
I
SS
SS Current Source V
SS
= 0V 7 10 12 µA
SS Pull-down Resistance 13 24 Ω
Error Amplifier
V
REF
FB Reference Voltage Measured at FB, FB = COMP 788 800 812 mV
FB Input Bias Current V
FB
= 0.8V 1 nA
V
OH
COMP Output High Voltage I
SOURCE
= 3mA 2.8 V
V
OL
COMP Output Low Voltage I
SINK
= 3mA 0.26 V
A
OL
DC Gain 80 dB
f
BW
Unity Gain Bandwidth 3 MHz
PWM Comparator
t
HO(OFF)
Forced HO Off-time 260 320 440 ns
t
ON(MIN)
Minimum HO On-time V
VIN
= 42V 100 ns
COMP to PWM comparator offset 1.2 V
Oscillator
f
SW1
Frequency 1 R
T
= 25kΩ 180 200 220 kHz
f
SW2
Frequency 2 R
T
= 10kΩ 430 480 530 kHz
RT Output Voltage 1.25 V
RT Sync Positive Threshold 2.6 3.2 3.95 V
Sync Pulse Width 100 ns
Current Limit
(1) Operating current does not include the current into the R
T
resistor.
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