Datasheet

LM5088, LM5088-Q1
www.ti.com SNVS600H –DECEMBER 2008–REVISED MARCH 2013
Electrical Characteristics
(1)
(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
at T
J
= 25°C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: V
VIN
=
48V, V
VCC
= 8V, V
EN
= 5V R
RT
= 31.6 kΩ, No load on HG.
Symbol Parameter Conditions Min Typ Max Units
CURRENT LIMIT
V
CS(TH)
Cycle by cycle sense voltage threshold V
RAMP
= 0V 112 120 136 mV
Cycle by Cycle Current Limit Delay V
RAMP
= 2.5V 280 ns
Buck Switch VDS protection VIN to SW 1.5 V
CURRENT LIMIT RESTART (RES Pin)
V
resup
RES Threshold Upper (rising) V
CS
= 0.125 1.1 1.2 1.3 V
V
resdown
RES Threshold Lower (falling) 0.1 0.2 0.3 V
I
charge
Charge source current V
CS
>= 0.125 40 50 65 µA
I
discharge
Discharge sink current V
CS
< 0.125 20 27 34 µA
I
rampdown
Discharge sink current -(post fault) 0.8 1.2 1.6 µA
RAMP GENERATOR
(2)
I
RAMP1
RAMP Current 1 V
VIN
= 60V, V
OUT
= 10V 235 295 345 µA
I
RAMP2
RAMP Current 2 V
VIN
= 10V, V
OUT
= 10V 18 25 30 µA
VOUT Bias Current V
OUT
= 48V 250 µA
RAMP Output Low Voltage V
VIN
= 60V, V
OUT
= 10V 200 mV
HIGH SIDE (HG) GATE DRIVER
V
OLH
HG Low-state Output Voltage I
HG
= 100 mA 115 215 mV
V
OHH
HG High-state Output Voltage I
HG
= -100 mA, V
OHH
= V
BOOT
- V
HG
240 mV
HG Rise Time C
load
= 1000 pF 12 ns
HG Fall Time C
load
= 1000 pF 6 ns
I
OHH
Peak HG Source Current V
HG
= 0V 1.5 A
I
OLH
Peak HG Sink Current V
HG
= V
VCC
2 A
BOOT UVLO BOOT to SW 3 V
Pre R
DS(ON)
Pre-Charge Switch ON- resistance I
VCC
= 1 mA 72 Ω
Pre-Charge switch ON time 300 ns
THERMAL
(3)
T
SD
Thermal Shutdown Temperature Junction Temperature Rising 165 °C
Thermal Shutdown Hysterisis Junction Temperature Falling 25 °C
θ
JC
Thermal Resistance Junction to Case 6 °C /W
θ
JA
Thermal Resistance Junction to Ambient 40 °C /W
(2) RAMP and COMP are output pins. As such they are not specified to have an external voltage applied.
(3) For detailed information on soldering plastic HTSSOP packages visit www.ti.com/packaging.
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