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TPS51427A Datasheet(PDF) 6 Page - Texas Instruments

No. de pieza TPS51427A
Descripción Electrónicos  DUAL D-CAP??SYNCHRONOUS STEP-DOWN CONTROLLER FOR NOTEBOOK POWER RAILS
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS51427A Datasheet(HTML) 6 Page - Texas Instruments

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TPS51427A
SLUS843B – MAY 2008 – REVISED SEPTEMBER 2008 .................................................................................................................................................. www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Over recommended free-air temperature range, VV5DRV = 5 V, VVIN = 12 V (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
REFERENCE (REF)
1.98
2.02
|IVREF2| = 0 µA
2.00
(–1%)
(+1%)
VREF2 Output Voltage
V
1.975
2.025
|IVREF2| < 50 µA
2.00
(–1.25%)
(+1.25%)
VREF2 Sink Current
VREF2 in regulation
50
µA
Falling edge of VREF2
1.575
1.700
1.825
VREF2 Undervoltage Lockout
V
Threshold
Hysteresis
0.1
OUT1 FAULT DETECTION
Overvoltage Trip Threshold
VFB1 with respect to nominal regulation point
+12.5%
+15%
+17.5%
Overvoltage Fault Propagation
VFB1 delay with 50-mV overdrive
10
µs
Delay
Undervoltage Trip Threshold
VFB1 with respect to nominal output voltage
–35%
–30%
–25%
Undervoltage Fault Propagation
0.8
1
1.2
ms
Delay
Undervoltage Fault Enable Delay
From ENx signal
10
20
30
ms
VFB1 with respect to nominal output, falling edge,
PGOOD1 Lower Trip Threshold
–12.5%
–10%
–7.5%
typical hysteresis = 5%
PGOOD1 Low Propagation Delay
Falling edge, 50-mV overdrive
10
µs
PGOOD1 High Propagation Delay
Rising edge, 50-mV overdrive
0.8
1.0
1.2
ms
PGOOD1 Output Low Voltage
PGOOD1 Low impedance, ISINK = 4 mA
0.4
0.8
V
PGOOD1 Leakage Current
PGOOD1 High impedance, forced to 5.5 V
1
µA
OUT2 FAULT DETECTION
Overvoltage Trip Threshold
REFIN2 with respect to nominal regulation point
+12.5%
+15.0%
+17.5%
Overvoltage Fault Propagation
REFIN2 delay with 50-mV overdrive
10
µs
Delay
Undervoltage Trip Threshold
REFIN2 with respect to nominal output voltage
–35%
–30%
–25%
Undervoltage Fault Propagation
0.8
1
1.2
ms
Delay
Undervoltage Fault Enable Delay
From ENx signal
10
20
30
ms
REFIN2 with respect to nominal output, falling edge,
PGOOD2 Lower Trip Threshold
–12.5%
–10%
–7.5%
typical hysteresis = 5%
PGOOD2 Low Propagation Delay
Falling edge, 50-mV overdrive
10
µs
PGOOD2 High Propagation Delay
Rising edge, 50-mV overdrive
0.8
1.0
1.2
ms
PGOOD2 Output Low Voltage
PGOOD2 Low impedance, ISINK = 4 mA
0.4
0.8
V
PGOOD2 Leakage Current
PGOOD2 High impedance, forced to 5.5 V
1
µA
6
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Product Folder Link(s): TPS51427A


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