LMR38020
www.ti.com
SNVSC40B – AUGUST 2021 – REVISED NOVEMBER 2021
7.3 Thermal Information
LMR38020-Q1
THERMAL METRIC(1)
DDA (HSOIC)
UNIT
8 PINS
42.9
29
RθJA
Junction-to-ambient thermal resistance
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
RθJA(Effecitve)
RθJC(top)
RθJB
Junction-to-ambient thermal resistance with TI EVM board
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
54
13.6
4.3
ψJT
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
ψJB
13.8
4.3
RθJC(bot)
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
7.4 Electrical Characteristics
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
SUPPLY VOLTAGE AND CURRENT
Needed to start up
4.2
3.8
V
V
VIN_OPERATE Input operating voltage
Once operating
IQ-SW
ISD
Operating quiescent current
VEN = 3.3 V (PFM variant only)
40
3
µA
Shutdown quiescent current;
measured at VIN pin
VEN = 0 V
10
µA
ENABLE
VEN-H
Enable input high level
Enable input low level
VENABLE rising
VENABLE falling
VEN = 3.3 V
1.1
1.25
1.10
5.0
1.4
V
V
VEN-L
0.95
1.22
ILKG-EN
Enable input leakage current
nA
VOLTAGE REFERENCE (FB PIN)
VREF
Feedback reference voltage
VIN = 4.2 V to 80 V, TJ = 25°C, FPWM
0.99
1
1
1.01
V
V
VREF
Feedback reference voltage
Feedback leakage current
FPWM
0.985
1.015
ILKG-FB
FB = 1.2 V
2.1
nA
CURRENT LIMITS AND HICCUP
ISC
High-side current limit(2)
2-A version
2.6
1.8
1.3
0.9
3.2
2.3
3.8
2.8
1.9
1.5
A
A
A
A
A
A
A
A
A
ILS-LIMIT
ISC
ILS-LIMIT
IL-ZC
Low-side current limit(2)
2-A version
High-side current limit(2)
1-A version
1.6
Low-side current limit(2)
1-A version
1.2
Zero cross detector threshold
Minimum inductor peak current(2)
Minimum inductor peak current(2)
Negative current limit(2)
PFM variants only
0.01
0.5
IPEAK-MIN
IPEAK-MIN
IL-NEG
IL-NEG
2-A version, PFM variants only
1-A version, PFM variants only
2-A version, FPWM variant only
1-A version, FPWM variant only
0.25
–0.9
–0.5
Negative current limit(2)
POWER STAGE
RDS-ON-HS
RDS-ON-LS
tON-MIN
High-side MOSFET ON-resistance
303
133
80
mΩ
mΩ
ns
Low-side MOSFET ON-resistance
Minimum switch on time(3)
Minimum switch off time
VIN = 24 V, IOUT = 1 A
131
300
tOFF-MIN
190
ns
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