Datasheet

LM5021
www.ti.com SNVS359D –MAY 2005–REVISED MARCH 2013
Absolute Maximum Ratings
(1)(2)
VIN to GND -0.3V to 30V
VIN Clamp Continuous Current 5mA
CS to GND -0.3V to 1.25V
RT to GND -0.3V to 5.5V
All other pins to GND -0.3V to 7.0V
ESD Rating
(3)
Human Body Model 2kV
Storage Temperature -65°C to +150°C
Operating Junction Temperature +150°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
(3) The human body model is a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin.
Operating Ratings
(1)
VIN Voltage
(2)
8V to 30V
Junction Temperature -40°C to +125°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics.
(2) After initial turn-on at VIN = 20V.
Electrical Characteristics
(1)
Specifications in standard type face are for T
J
= +25°C and those in boldface type apply over the full Operating Junction
Temperature Range. Unless otherwise specified: V
IN
= 15V, R
T
= 44.2KΩ.
Symbol Parameter Conditions Min Typ Max Unit
STARTUP CIRCUIT
Start Up Current Before VCC Enable 18 25 µA
VCC Regulator enable threshold 17 20 23 V
VCC Regulator disable threshold 7.25 V
VIN ESD Clamp voltage I = 5mA 30 36 40 V
I
VIN
Operating supply current COMP = 0VDC 2.5 3.75 mA
VCC SUPPLY
Controller enable threshold 6.5 7 7.5 V
Controller disable threshold 5.3 5.8 6.3 V
VCC regulated output No External Load 8 8.5 9 V
VCC dropout voltage (VIN - VCC) I = 5 mA 1.7 V
VCC regulator current limit VCC = 7.5V
(2)
15 22 mA
SKIP CYCLE MODE COMPARATOR
Skip Cycle mode enable threshold ⅓ [COMP - 1.25V] 75 125 175 mV
Skip Cycle mode hysteresis 5 mV
CURRENT LIMIT
CS limit to OUT delay CS stepped from 0 to 35 ns
0.6V, time to OUT
transition low, C
load
=
0.
CS limit threshold 0.45 0.5 0.55 V
Leading Edge Blanking time 90 ns
CS blanking sinking impedance 35 55 Ω
(1) Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are specified through correlation
using Statistical Quality Control (SQC) methods. Limits are used to calculate Average Outgoing Quality Level (AOQL).
(2) Device thermal limitations may limit usable range.
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