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LM21212-2 Folha de dados(PDF) 3 Page - Texas Instruments

Nome de Peças LM21212-2
Descrição Electrónicos  12A High Efficiency Synchronous Buck Regulator with Adjustable Switching Frequency
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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LM21212-2
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SNVS715A – MARCH 2011 – REVISED MARCH 2013
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ABSOLUTE MAXIMUM RATINGS
(1) (2)
PVIN(3), AVIN to GND
−0.3V to +6V
SW(4), EN, FB, COMP, PGOOD, SS/TRK, FADJ to GND
−0.3V to PVIN + 0.3V
Storage Temperature
−65°C to 150°C
Soldering Specification for TSSOP Pb-Free Infrared or Convection (30 sec)
260°C
ESD Rating, Human Body Model (5)
2kV
(1)
Absolute Maximum Ratings indicate limits beyond witch damage to the device may occur. Operating Ratings indicate conditions for
which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test
conditions, see the Electrical Characteristics.
(2)
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3)
The PVIN pin can tolerate transient voltages up to 6.5 V for a period of up to 6ns. These transients can occur during the normal
operation of the device.
(4)
The SW pin can tolerate transient voltages up to 9.0 V for a period of up to 6ns, and -1.0V for a duration of 4ns. These transients can
occur during the normal operation of the device.
(5)
The human body model is a 100 pF capacitor discharged through a 1.5 k
Ω resistor to each pin.
OPERATING RATINGS
PVIN, AVIN to GND
+2.95V to +5.5V
Junction Temperature
−40°C to +125°C
θJA
(1)
24°C/W
(1)
Thermal measurements were performed on a 2x2 inch, 4 layer, 2 oz. copper outer layer, 1 oz.copper inner layer board with twelve 8 mil.
vias underneath the EP of the device and an additional sixteen 8 mil. vias under the unexposed package.
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, the following conditions apply: VPVIN, AVIN = 5V. Limits in standard type are for TJ = 25°C only, limits
in bold face type apply over the junction temperature (TJ) range of −40°C to +125°C. Minimum and maximum limits 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.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
SYSTEM
VFB
Feedback pin voltage
VIN = 2.95V to 5.5V
-1%
0.6
1%
V
ΔVOUT/ΔIOUT Load Regulation
0.02
%VOUT/
A
ΔVOUT/ΔVIN
Line Regulation
0.1
%VOUT/
V
RDSON HS
High Side Switch On Resistance
ISW = 12A
7.0
9.0
m
RDSON LS
Low Side Switch On Resistance
ISW = 12A
4.3
6.0
m
ICLR
HS Rising Switch Current Limit
15
17
19
A
ICLF
LS Falling Switch Current Limit
12
A
VZX
Zero Cross Voltage
-8
3
12
mV
IQ
Operating Quiescent Current
1.5
3.0
mA
ISD
Shutdown Quiescent Current
VEN = 0V
50
70
µA
VUVLO
AVIN Under Voltage Lockout
AVIN Rising
2.45
2.70
2.95
V
VUVLOHYS
AVIN Under Voltage Lockout Hysteresis
140
200
280
mV
VTRACKOS
SS/TRACK PIN accuracy (VSS - VFB)
0 < VTRACK < 0.55V
-10
6
20
mV
ISS
Soft-Start Pin Source Current
1.3
1.9
2.5
µA
tINTSS
Internal Soft-Start Ramp to Vref
CSS = 0
350
500
675
µs
tRESETSS
Device Reset to Soft-Start Ramp
50
110
200
µs
OSCILLATOR
fRNG
FADJ Frequency Range
300
1550
kHz
Copyright © 2011–2013, Texas Instruments Incorporated
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