LMR38020
www.ti.com
SNVSC40B – AUGUST 2021 – REVISED NOVEMBER 2021
Limits apply over operating junction temperature (TJ ) range of –40°C to +150°C, unless otherwise stated. Minimum and
Maximum limits(1) are specified through test, design or statistical correlation. Typical values represent the most likely
parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated, the following
conditions apply: VIN = 24 V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
tON-MAX
Maximum switch on time
5
μs
SWITCHING FREQUENCY AND SYNCHRONIZATION
FOSC
Switching frequency
RT = 49.9 kΩ
430
525
650
8%
2
kHz
Spread of internal oscillator with
spread
spectrum enabled
FSPREAD
VSYNC_HI
–8%
SYNC clock high level threshold
V
V
VSYNC_LO SYNC clock low level threshold
0.6
High duration needed to be recognized
as a pulse
tPULSE_H
50
ns
μs
Time needed for clock to lock to a valid
CLOCK
230
synchronization signal in sync cycles
STARTUP AND TRACKING
tSS
POWER GOOD
VPG-HIGH-UP
VPG-LOW-DN
Internal soft-start time
4
ms
Power-good upper threshold — rising % of FB voltage
Power-good lower threshold — falling % of FB voltage
110%
90%
112%
92%
114%
94%
Power-good hysteresis (rising and
% of FB voltage
VPG-HYS
2.2%
falling)
Minimum input voltage for proper
power-good function
VPG-VALID
2
V
RPG
RPG
Power-good on-resistance
Power-good on-resistance
VEN = 0 V
140
92
Ω
Ω
VEN = 3.3 V
Glitch filter time constant for
PGOOD function
tPGDFLT(fall)
40
μs
THERMAL SHUTDOWN
(1)
TSD-Rising
Thermal shutdown
Thermal shutdown
Shutdown threshold
Recovery threshold
163
150
℃
℃
(1)
TSD-Falling
(1) MIN and MAX limits are 100% production tested at 25℃. Limits over the operating temperature range verified through correlation using
Statistical Quality Control (SQC) methods. Limits are used to calculate Average Outgoing Quality Level (AOQL).
(2) The current limit values in this table are tested, open loop, in production. They may differ from those found in a closed loop application.
(3) Not production tested. Specified by correlation by design at 1-A load.
Copyright © 2021 Texas Instruments Incorporated
6
Submit Document Feedback
Product Folder Links: LMR38020