Datasheet

TPS51117
www.ti.com ...................................................................................................................................... SLVS631B –DECEMBER 2005–REVISED SEPTEMBER 2009
RECOMMENDED OPERATING CONDITIONS (continued)
over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
DRVH –0.8 34
DRVH (with respect to LL) –0.1 5.5
Output voltage range LL –0.8 28 V
PGOOD, DRVL –0.1 5.5
PGND –0.1 0.1
Operating free-air temperature, T
A
–40 85 °C
ELECTRICAL CHARACTERISTICS
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
I
V5FILTPWM
Supply current 400 750 μA
= 0.77V, LL = –0.1 V
V5FILT + V5DRV current, auto-skip, EN_PSV = 5 V,
I
V5FILTSKIP
Supply current 250 470 μA
VFB = 0.77V, LL = 0.5 V
I
V5DRVSDN
V5DRV shutdown current V5DRV current, EN_PSV = 0 V 0 1 μA
I
V5FILTSDN
V5FILT shutdown current V5FILT current, EN_PSV = 0 V 4.5 7.5 μA
VOUT AND VFB VOLTAGES
V
OUT
Output voltage Adjustable output range 0.75 5.5 V
V
VFB
VFB regulation voltage 750 mV
T
A
= 25°C, bandgap initial accuracy –0.9% 0.9%
VFB regulation voltage
V
VFB_TOL
T
A
= 0°C to 85°C –1.3% 1.3%
tolerance
T
A
= -40°C to 85°C –1.6% 1.6%
I
VFB
VFB input current V
FB
= 0.75 V, absolute value 0.02 0.1 μA
R
Dischg
VOUT discharge resistance EN_PSV = 0 V, V
OUT
= 0.5 V 20 32 Ω
ON-TIME TIMER AND INTERNAL SOFT START
T
ONN
Nominal on time V
LL
= 12 V, V
OUT
= 2.5 V, R
TON
= 250 kΩ 750 ns
T
ONF
Fast on time V
LL
= 12 V, V
OUT
= 2.5 V, R
TON
= 100 kΩ 264 330 396 ns
T
ONS
Slow on time V
LL
= 12 V, V
OUT
= 2.5 V, R
TON
= 400 kΩ 1169 ns
T
ON(MIN)
Minimum on time V
OUT
= 0.75 V, R
TON
= 100 kΩ to 28 V
(1)
80 110 140 ns
V
FB
= 0.7 V, LL = -0.1 V,
T
OFF(MIN)
Minimum off time 440 ns
TRIP = open
Time from EN_PSV > 3 V to V
FB
regulation
T
SS
Internal soft start time 0.82 1.2 1.5 ms
value = 0.735 V
OUTPUT DRIVERS
Source, V
VBST-DRVH
= 0.5 V 5 7 Ω
R
DRVH
DRVH resistance
Sink, V
DRVH-LL
= 0.5 V 1.5 2.5 Ω
Source, V
V5DRV-DRVL
= 0.5 V 5 7 Ω
R
DRVL
DRVL resistance
Sink, V
DRVL-PGND
= 0.5 V 1.5 2.5 Ω
DRVH-low (DRVH = 1 V) to DRVL-high
10 20 50 ns
(DRVL = 4 V), LL = –0.05 V
T
D
Dead time
DRVL-low (DRVL = 1 V) to DRVH-high
30 40 60 ns
(DRVH = 4V), LL = –0.05 V
(1) Design constraint, ensure actual on-time is larger than the max value (i.e., design R
TON
such that the min tolerance is 100 kΩ).
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