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TPS54292PWPR Datasheet(PDF) 3 Page - Texas Instruments

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No. de pieza TPS54292PWPR
Descripción Electrónicos  1.5-A/2.5-A Dual, Fully-Synchronous Buck Converter With Integrated MOSFET
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

TPS54292PWPR Datasheet(HTML) 3 Page - Texas Instruments

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TPS54290, TPS54291, TPS54292
www.ti.com
SLUS973 – OCTOBER 2009
ELECTRICAL CHARACTERISTICS
TJ = –40°C to 125°C, PVDD1 and 2 = 12V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
INPUT SUPPLY
PVDD1, PVDD2
Input voltage range
4.5
18
V
IDDSDN
Shutdown current
EN1=EN2 = PVDD2 (4.5-18V)
80
160
µA
IDDQ
Quiescent, non-switching
FB1 = FB2 = 1 V, Outputs Off
1.65
3.00
mA
IDDSW
Quiescent, while switching
FB1 = FB2 = 0.75V, measured at BP
10
mA
UVLO
Minimum turn-on voltage
PVDD2 only
3.8
4.1
4.4
V
UVLOHYS
Hysteresis
460
600
mV
Time from startup to soft start
CBP=10µF, EN1 and EN2 go low
tstart
(1) (2)
1.5
ms
begin
simultaneously
ENABLE (ACTIVE LOW)
Enable threshold voltage
0.9
1.2
1.5
V
V ENx
Hysteresis
70
mV
I ENx
Enable pull-up current
10
µA
Time from enable to soft-start
t ENx
(1)
Other enable pin = GND
10
µs
begin
BP REGULATOR
BP
Regulator voltage
8 V
≤ VPVDD2 ≤ 18 V
5.0
5.2
5.6
V
BPLDO
Dropout voltage
VPVDD2 = 4.5 V
400
mV
IBPS
Regulator short current
4.5 V
≤ VPVDD2 ≤ 18 V
25
mA
OSCILLATOR
TPS54290
260
300
360
kHz
fSW
Oscillator frequency
TPS54291
520
600
720
TPS54292
1040
1200
1440
kHz
tDEAD
(1)
Clock dead time
140
ns
gMTRANSCONDUCTANCE AMPLIFIER AND VOLTAGE REFERENCE (Applies to both channels)
0°C < TJ < 85°C
792
800
808
mV
VFB
Feedback input voltage
–40ºC < TJ < 125°C
786
800
812
mV
IFB
Feedback Input bias current
VFB=0.8 V
5
50
nA
gM
(1)
Transconductance
200
325
450
µS
Error amplifier source current
15
30
40
µA
ISOURCE
VFB1=VFB2=0.7 V, VCOMP=0 V
capability
Error amplifier sink current
ISINK
VFB1=VFB2=0.9 V, VCOMP=2 V
15
30
40
µA
capability
SOFT-START (Applies to both channels)
TPS54290 0 V
≤ VFB ≤ 0.8 V
4.0
5.2
6.0
tSS
Soft-start time
TPS54291
2.0
2.6
3.0
ms
TPS54292
1.0
1.3
1.6
OVERCURRENT PROTECTION
ICL1
Current limit CH1
1.8
2.2
2.6
A
ICL2
Current limit CH2
3.2
3.8
4.6
A
TPS54290
30
ms
THICCUP
(1)
Hiccup timeout
TPS54291
16
TPS54292
8
tONOC
(1)
Minimum overcurrent pulse
150
200
ns
(1)
Specified by design. Not tested in production.
(2)
When both outputs are started simultaneously, a 20-mA current source charges the BP capacitor. Faster times are possible with a lower
BP capacitor value. See Input UVLO and Startup.
Copyright © 2009, Texas Instruments Incorporated
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