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LM21212-2 Datenblatt(PDF) 4 Page - Texas Instruments

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Teilenummer LM21212-2
Bauteilbeschribung  12A High Efficiency Synchronous Buck Regulator with Adjustable Switching Frequency
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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LM21212-2
SNVS715A – MARCH 2011 – REVISED MARCH 2013
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
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
fSW
Switching Frequency
RADJ = 22.6kΩ
1400
1550
1700
kHz
RADJ = 95.3kΩ
465
500
535
tHSBLANK
HS OCP Blanking Time
Rising edge of SW to ICLR
55
ns
comparison
tLSBLANK
LS OCP Blanking Time
Falling edge of SW to ICLF
400
ns
comparison
tZXBLANK
Zero Cross Blanking Time
Falling edge of SW to VZX
120
ns
comparison
tMINON
Minimum HS on-time
140
ns
ΔVramp
PWM Ramp p-p Voltage
0.8
V
ERROR AMPLIFIER
VOL
Error Amplifier Open Loop Voltage Gain
ICOMP = -65µA to 1mA
95
dBV/V
GBW
Error Amplifier Gain-Bandwidth Product
11
MHz
IFB
Feedback Pin Bias Current
VFB = 0.6V
1
nA
ICOMPSRC
COMP Output Source Current
1
mA
ICOMPSINK
COMP Output Sink Current
65
µA
POWERGOOD
VOVP
Over Voltage Protection Rising Threshold
VFB Rising
105
112.5
120
%VFB
VOVPHYS
Over Voltage Protection Hysteresis
VFB Falling
2
%VFB
VUVP
Under Voltage Protection Rising Threshold
VFB Rising
82
90
97
%VFB
VUVPHYS
Under Voltage Protection Hysteresis
VFB Falling
2.5
%VFB
tPGDGL
PGOOD Deglitch Low (OVP/UVP Condition Duration
15
µs
to PGOOD Falling)
tPGDGH
PGOOD Deglitch High (minimum low pulse)
12
µs
RPGOOD
PGOOD Pull-down Resistance
10
20
40
IPGOODLEAK
PGOOD Leakage Current
VPGOOD = 5V
1
nA
LOGIC
VIHSYNC
SYNC Pin Logic High
2.0
V
VILSYNC
SYNC Pin Logic Low
0.8
V
VIHENR
EN Pin Rising Threshold
VEN Rising
1.20
1.35
1.45
V
VENHYS
EN Pin Hysteresis
50
110
180
mV
IEN
EN Pin Pullup Current
VEN = 0V
2
µA
THERMAL SHUTDOWN
TTHERMSD
Thermal Shutdown
165
°C
TTHERMSDHYS Thermal Shutdown Hysteresis
10
°C
4
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