Datasheet

LMR61428
SNVS815A –JUNE 2012–REVISED APRIL 2013 www.ti.com
Electrical Characteristics
Limits in standard typeface are for T
J
= 25°C, and limits in boldface type apply over the full operating temperature range of
−40°C to +85°C. Unless otherwise specified: V
DD
= V
OUT
= 3.3V.
Symbol Parameter Condition Min Typ Max Units
V
IN_ST
Minimum Start-Up Supply Voltage I
LOAD
= 0mA 1.1 1.2 V
(1)
V
IN_OP
Minimum Operating Supply I
LOAD
= 0mA 0.65 V
Voltage (once started)
V
FB
FB Pin Voltage 1.2028 1.24 1.2772 V
V
OUT_MAX
Maximum Output Voltage 14 V
V
HYST
Hysteresis Voltage
(2)
At Feedback Pin 30 45 mV
η Efficiency V
IN
= 3.6V;V
OUT
= 5V;I
LOAD
= 0.5A 87
%
V
IN
= 2.5V;V
OUT
= 3.3V;I
LOAD
= 0.2A 87
D Switch Duty Cycle 60 70 80 %
I
DD
Operating Quiescent Current
(3)
FB Pin > 1.3V; EN Pin at V
DD
80 110 µA
I
SD
Shutdown Quiescent Current
(4)
V
DD
, BOOT and SW Pins at 5.0V; µA
0.01 2.5
EN Pin <200mV
I
CL
Switch Peak Current Limit 2.85 A
R
DS_ON
MOSFET Switch On Resistance 0.17 Ω
Enable Section
V
EN_LO
EN Pin Voltage Low
(5)
0.15V
DD
V
V
EN_HI
EN Pin Voltage High
(5)
0.7V
DD
V
(1) Output in regulation, V
OUT
= V
OUT (NOMINAL)
± 5%
(2) This is the hysteresis value of the internal comparator used for the gated-oscillator control scheme.
(3) This is the current into the V
DD
pin.
(4) This is the total current into pins V
DD
, BOOT, SW and FREQ.
(5) When the EN pin is below V
EN_LO
, the regulator is shut down; when it is above V
EN_HI
, the regulator is operating.
4 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links: LMR61428