Datasheet

LM2852
SNVS325D –JANUARY 2005–REVISED APRIL 2013 www.ti.com
Electrical Characteristics
AVIN = PVIN = 5V unless otherwise indicated under the Conditions column. Limits in standard type are for T
J
= 25°C only;
limits in boldface type apply over the junction temperature (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.
Symbol Parameter Conditions Min Typ Max Units
SYSTEM PARAMETERS
V
OUT
V
OUT
= 0.8V option 0.782 0.818
V
OUT
= 1.0V option 0.9775 1.0225
V
OUT
= 1.2V option 1.1730 1.2270
V
OUT
= 1.5V option 1.4663 1.5337
Voltage
V
Tolerance
(1)
V
OUT
= 1.8V option 1.7595 1.8405
V
OUT
= 2.5V option 2.4437 2.5563
V
OUT
= 3.0V option 2.9325 3.0675
V
OUT
= 3.3V option 3.2257 3.3743
ΔV
OUT
/ΔAVIN V
OUT
= 0.8V, 1.0V, 1.2V, 1.5V, 1.8V or 2.5V
0.2 0.6 %
2.85V ≤ AVIN ≤ 5.5V
Line Regulation
(1)
V
OUT
= 3.3V
0.2 0.6 %
3.5V ≤ AVIN ≤ 5.5V
ΔV
OUT
/ΔI
O
Load Regulation Normal operation 8 mV/A
V
ON
Rising 2.47 2.85 V
UVLO Threshold
(AVIN)
Falling Hysteresis 85 150 210 mV
r
DSON-P
PFET On
Isw = 2A 75 140 mΩ
Resistance
r
DSON-N
NFET On
Isw = 2A 55 120 mΩ
Resistance
R
SS
Soft-start resistance 400 kΩ
I
CL
LM2852X 2.75 4 4.95
Peak Current Limit
A
Threshold
LM2852Y 2.25 3 3.65
I
Q
Operating Current Non-switching 0.85 2 mA
I
SD
Shutdown Quiescent
EN = 0V 10 25 µA
Current
R
SNS
Sense pin resistance 400 kΩ
PWM
f
osc
LM2852X 1500kHz option. 1050 1500 1825 kHz
LM2852Y 500kHz option. 325 500 625 kHz
D
range
Duty Cycle Range 0 100 %
ENABLE CONTROL
(2)
V
IH
EN Pin Minimum % of
75
High Input AVIN
V
IL
EN Pin Maximum % of
25
Low Input AVIN
I
EN
EN Pin Pullup
EN = 0V 1.2 µA
Current
THERMAL CONTROLS
T
SD
T
J
for Thermal
165 °C
Shutdown
T
SD-HYS
Hysteresis for
10 °C
Thermal Shutdown
(1) V
OUT
measured in a non-switching, closed-loop configuration at the SNS pin.
(2) The enable pin is internally pulled up, so the LM2852 is automatically enabled unless an external enable voltage is applied.
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