Datasheet

LM25116
www.ti.com SNVS509D –APRIL 2007–REVISED FEBRUARY 2013
Electrical Characteristics (continued)
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 and are provided for reference only. Unless otherwise specified, the following conditions apply: VIN = 24V, VCC =
7.4V, VCCX = 0V, EN = 5V, R
T
= 16 kΩ, no load on LO and HO.
Symbol Parameter Conditions Min Typ Max Unit
VCCX Switch R
DS(ON)
ICCX = 10 mA 3.8 6.2 Ω
VCCX Leakage VCCX = 0V -200 nA
VCCX Pull- down Resistance VCCX = 3V 100 kΩ
VCC Under-voltage Threshold VCC Rising 4.3 4.5 4.7 V
VCC Under-voltage Hysteresis 0.2 V
HB DC Bias Current HB - SW = 15V 125 200 µA
EN Input
VIL max EN Input Low Threshold 0.5 V
VIH min EN Input High Threshold 3.3 V
EN Input Bias Current VEN = 3V -7.5 -3 1 µA
EN Input Bias Current VEN = 0.5V -1 0 1 µA
EN Input Bias Current VEN = 42V 15 µA
UVLO Thresholds
UVLO Standby Threshold UVLO Rising 1.170 1.215 1.262 V
UVLO Threshold Hysteresis 0.1 V
UVLO Pull-up Current Source UVLO = 0V 5.4 µA
UVLO Pull-down R
DS(ON)
80 210 Ω
Soft Start
SS Current Source SS = 0V 8 11 14 µA
SS Diode Emulation Ramp Disable SS Rising 3 V
Threshold
SS to FB Offset FB = 1.25V 160 mV
SS Output Low Voltage Sinking 100 µA, UVLO = 0V 45 mV
Error Amplifier
V
REF
FB Reference Voltage Measured at FB pin, FB = COMP 1.195 1.215 1.231 V
FB Input Bias Current FB = 2V 15 500 nA
COMP Sink/Source Current 3 mA
A
OL
DC Gain 80 dB
f
BW
Unity Gain Bandwidth 3 MHz
PWM Comparators
t
HO(OFF)
Forced HO Off-time 320 450 580 ns
t
ON(min)
Minimum HO On-time VIN = 42V, C
RAMP
= 50 pF 100 ns
Oscillator
f
SW1
Frequency 1 RT = 16 kΩ 180 200 220 kHz
f
SW2
Frequency 2 RT = 5 kΩ 480 535 590 kHz
RT output voltage 1.191 1.215 1.239 V
RT sync positive threshold 3.0 3.5 4.0 V
Current Limit
V
CS(TH)
Cycle-by-cycle Sense Voltage VCCX = 0V, RAMP = 0V 94 110 126 mV
Threshold (CSG - CS)
V
CS(THX)
Cycle-by-cycle Sense Voltage VCCX = 5V, RAMP = 0V 105 122 139 mV
Threshold (CSG - CS)
CS Bias Current CS = 42V -1 1 µA
CS Bias Current CS = 0V 90 125 µA
CSG Bias Current CSG = 0V 90 125 µA
Current Limit Fault Timer R
T
= 16 kΩ, (200 kHz), (256 clock cycles) 1.28 ms
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