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TPS51117PW Fiches technique(PDF) 3 Page - Texas Instruments

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No de pièce TPS51117PW
Description  SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS51117PW Fiches technique(HTML) 3 Page - Texas Instruments

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ELECTRICAL CHARACTERISTICS
TPS51117
SLVS631 – DECEMBER 2005
over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY CURRENT
V5FILT + V5DRV current, PWM, EN_PSV = float, VFB
IV5FILTPWM
Supply current
400
750
µA
= 0.77V, LL = –0.1 V
V5FILT + V5DRV current, auto-skip, EN_PSV = 5 V,
IV5FILTSKIP
Supply current
250
470
µA
VFB = 0.77V, LL = 0.5 V
IV5DRVSDN
V5DRV shutdown current
V5DRV current, EN_PSV = 0 V
0
1
µA
IV5FILTSDN
V5FILT shutdown current
V5FILT current, EN_PSV = 0 V
4.5
7.5
µA
VOUT AND VFB VOLTAGES
VOUT
Output voltage
Adjustable output range
0.75
5.5
V
VVFB
VFB regulation voltage
750
mV
TA = 25°C, bandgap initial accuracy
–0.9%
0.9%
VFB regulation voltage
VVFB_TOL
TA = 0°C to 85°C
–1.3%
1.3%
tolerance
TA = -40°C to 85°C
–1.6%
1.6%
IVFB
VFB input current
VFB = 0.75 V, absolute value
0.02
0.1
µA
RDischg
VOUT discharge resistance
EN_PSV = 0 V, VOUT = 0.5 V
20
32
ON-TIME TIMER AND INTERNAL SOFT START
TONN
Nominal on time
VLL = 12 V, VOUT = 2.5 V, RTON = 250 kΩ
750
ns
TONF
Fast on time
VLL = 12 V, VOUT = 2.5 V, RTON = 100 kΩ
264
330
396
ns
TONS
Slow on time
VLL = 12 V, VOUT = 2.5 V, RTON = 400 kΩ
1169
ns
TON(MIN)
Minimum on time
VOUT = 0.75 V, RTON = 100 kΩ to 28 V(1)
80
110
140
ns
VFB = 0.7 V, LL = -0.1 V,
TOFF(MIN)
Minimum off time
440
ns
TRIP = open
Time from EN_PSV > 3 V to VFB regulation
TSS
Internal soft start time
0.82
1.2
1.5
ms
value = 0.735 V
OUTPUT DRIVERS
Source, VVBST-DRVH = 0.5 V
5
7
RDRVH
DRVH resistance
Sink, VDRVH-LL = 0.5 V
1.5
2.5
Source, VV5DRV-DRVL = 0.5 V
5
7
RDRVL
DRVL resistance
Sink, VDRVL-PGND = 0.5 V
1.5
2.5
DRVH-low (DRVH = 1 V) to DRVL-high
10
20
50
ns
(DRVL = 4 V), LL = –0.05 V
TD
Dead time
DRVL-low (DRVL = 1 V) to DRVH-high
30
40
60
ns
(DRVH = 4V), LL = –0.05 V
INTERNAL BST DIODE
VFBST
Forward voltage
VV5DRV-VBST, IF = 10 mA, TA = 25°C
0.7
0.8
0.9
V
IVBSTLK
VBST leakage current
VBST = 34 V, LL = 28 V
0.1
1
µ A
(1)
Design constraint, ensure actual on-time is larger than the max value (i.e., design RTON such that the min tolerance is 100 kΩ).
3


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