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LMR38020

更新时间: 2022-05-14 22:22:26
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描述
LMR38020 SIMPLE SWITCHER® 4.2-V to 80-V, 2-A Synchronous Buck Converter with 40-μA IQ

LMR38020 数据手册

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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  
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