Datasheet

LM2854
SNVS560C –MARCH 2008–REVISED APRIL 2013 www.ti.com
Electrical Characteristics
Specifications with standard typeface are for T
J
= 25°C only; limits in bold face type apply over the Operating Junction
Temperature Range T
J
range of -40°C to 125°C. 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. AVIN = PVIN = EN = 5.0V, unless otherwise indicated in the Conditions column.
Symbol Parameter Conditions Min
(1)
Typ
(2)
Max
(1)
Units
SYSTEM PARAMETERS
V
REF
Reference Voltage
(3)
Measured at the FB pin 0.790 0.8 0.808 V
ΔV
REF
/ΔAVIN Line Regulation
(3)
ΔAVIN = 2.95V to 5.50V 0.04 0.6 %
ΔV
REF
/ΔI
O
Load Regulation Normal operation 0.25 mV/A
V
ON
UVLO Threshold (AVIN) Rising 2.6 2.95 V
Falling hysteresis 25 170 375 mV
R
DS(ON)-P
PFET On Resistance I
SW
= 4A 35 65 mΩ
R
DS(ON)-N
NFET On Resistance I
SW
= 4A 34 65 mΩ
I
SS
Soft-Start Current 2 µA
I
CL
Peak Current Limit Threshold 4.5 6.0 6.7 A
I
Q
Operating Current Non-switching 1.7 3 mA
I
SD
Shut Down Quiescent Current EN = 0V 230 500 µA
PWM SECTION
f
SW
Switching Frequency 1 MHz option 800 1050 1160 kHz
500 kHz option 400 525 580 kHz
D
range
PWM Duty Cycle Range 0 100 %
ENABLE CONTROL
V
IH
EN Pin Rising Threshold 0.8 1.23 1.65 V
V
EN(HYS)
EN Pin Hysteresis 150 mV
THERMAL CONTROL
T
SD
T
J
for Thermal Shutdown 165 °C
T
SD-HYS
Hysteresis for Thermal Shutdown 10 °C
THERMAL RESISTANCE
θ
JA
Junction to Ambient PWP0016A 35 °C/W
(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) Typical numbers are at 25°C and represent the most likely parametric norm.
(3) V
REF
measured in a non-switching, closed-loop configuration.
4 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM2854