Datasheet

LMR24210
www.ti.com SNVS738G –OCTOBER 2011–REVISED APRIL 2013
Electrical Characteristics
Specifications with standard type are for T
J
= 25°C only; limits in boldface type apply over the full Operating Junction
Temperature (T
J
) range. Minimum and Maximum limits are ensured through test, design, or statistical correlation. Typical
values represent the most likely parametric norm at T
J
= 25°C, and are provided for reference purposes only. Unless
otherwise stated the following conditions apply: V
IN
= 18V, V
OUT
= 3.3V.
(1)
Symbol Parameter Conditions Min Typ Max Units
Start-Up Regulator, V
CC
V
CC
V
CC
output voltage C
CC
= 680nF, no load 5.0 6.0 7.2 V
V
IN
- V
CC
V
IN
- V
CC
dropout voltage I
CC
= 20mA 350 mV
I
VCCL
V
CC
current limit
(2)
V
CC
= 0V 40 65 mA
V
CC-UVLO
V
CC
under-voltage lockout threshold V
IN
increasing 3.55 3.75 3.95 V
(UVLO)
V
CC-UVLO-HYS
V
CC
UVLO hysteresis V
IN
decreasing – DSBGA 150 mV
package
t
VCC-UVLO-D
V
CC
UVLO filter delay 3 µs
I
IN
I
IN
operating current No switching, V
FB
= 1V 0.7 1 mA
I
IN-SD
I
IN
operating current, Device shutdown V
EN
= 0V 25 40 µA
Switching Characteristics
R
DS-UP-ON
Main MOSFET R
DS(on)
0.18 0.375 Ω
R
DS- DN-ON
Syn. MOSFET R
DS(on)
0.11 0.225 Ω
V
G-UVLO
Gate drive voltage UVLO V
BST
- V
SW
increasing 3.3 4 V
Soft-start
I
SS
SS pin source current V
SS
= 0.5V 11 µA
Current Limit
I
CL
Syn. MOSFET current limit threshold LMR24210 1.2 1.8 2.6 A
ON/OFF Timer
t
on
ON timer pulse width V
IN
= 10V, R
ON
= 100 kΩ 1.38 µs
V
IN
= 30V, R
ON
= 100 kΩ 0.47
t
on-MIN
ON timer minimum pulse width 150 ns
t
off
OFF timer pulse width 260 ns
Enable Input
V
EN
EN Pin input threshold V
EN
rising 1.13 1.18 1.23 V
V
EN-HYS
Enable threshold hysteresis V
EN
falling 90 mV
Regulation and Over-Voltage Comparator
V
FB
In-regulation feedback voltage V
SS
≥ 0.8V 0.784 0.8 0.816 V
T
J
= −40°C to +125°C
V
FB-OV
Feedback over-voltage threshold 0.888 0.920 0.945 V
I
FB
FB pin current 5 nA
Thermal Shutdown
T
SD
Thermal shutdown temperature T
J
rising 165 °C
T
SD-HYS
Thermal shutdown temperature T
J
falling 20 °C
hysteresis
(1) Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation
using Statistical Quality Control (SQC) methods. Limits are used to calculate Average Outgoing Quality Level (AOQL).
(2) V
CC
provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading.
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