Datasheet

Not Recommended for New Designs
TPS51315
SLUS881B –MAY 2009–REVISED AUGUST 2012 www.ti.com
ELECTRICAL CHARACTERISTICS
over recommended free-air temperature range (unless otherwise noted)
PARAMETER CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
V5IN current, T
A
= 25°C, No Load,
I
V5IN
V5IN supply current 0 1 μA
EN_PSV = 5V, V
VFB
= 0.75 V, V
LL
= 0.5 V
V5FILT current, T
A
= 25°C, No Load,
I
V5FILT
V5FILT supply current 400 μA
V
EN_PSV
= 5 V, V
VFB
= 0.75 V, LL = 0.5 V
V5IN current, T
A
= 25°C, No Load,
I
V5INSDN
V5IN shutdown current 0 1 μA
V
EN_PSV
= 0 V
V5FILT current, T
A
= 25°C, No Load,
I
V5FILTSDN
V5FILT shutdown current 1.5 4.5 7.5 μA
V
EN_PSV
= 0 V
VOUT AND VREF VOLTAGES
V
OUT
Output voltage Adjustable output range 0.75 5.5 V
V
VFB
VFB regulation voltage V
FB
voltage 751 mV
T
A
= 25°C, bandgap initial accuracy –0.9% 0.9%
V
VFB_TOL
VFB regulation voltage tolerance 0°C ≤ T
A
≤ 85°C –1.3% 1.3%
–40°C ≤ T
A
≤ 85°C –1.6% 1.6%
I
VFB
VFB input current V
VFB
= 0.75 V, T
A
= 25°C –0.025 μA
R
Dischg
VOUT_DS discharge resistance V
EN_PSV
= 0 V, VOUT_DS = 0.75 V 20 Ω
HOUSEKEEPING CLOCK, ON-TIME TIMER, and INTERNAL SOFT START
T
ONN
Nominal on-time V
IN
= 10 V, V
OUT
= 2.5 V, R
T(on)
= 250 kΩ 1115 ns
T
ONF
Fast switch on-time V
IN
= 10 V, V
OUT
= 2.5 V, R
T(on)
= 100 kΩ 865 ns
T
ONS
Slow switch on-time V
IN
= 10 V, V
OUT
= 2.5 V, R
T(on)
= 400 kΩ 1515 ns
T
ON
Minimum on-time V
IN
= 10 V, V
OUT
= 0.75 V, R
T(on)
= 100 kΩ
(1)
170 200 ns
T
A
= 25°C, V
VFB
= 0.75 V, V
LL
= –0.1V,
T
OFF(min)
Minimum off-time 385 ns
V
TRIP
= OPEN
T
SS
Internal soft-start time T
A
= 25°C, V
EN_PSV
> 3 V 1.06 ms
f
CLK
Clock frequency Soft-start, UVP, OVP, PGOOD
(2)
240 250 260 kHz
INTERNAL BST DIODE
V
FBST
Forward voltage V
V5IN-VBST
, I
F
= 10 mA, T
A
= 25°C 0.7 0.8 0.9 V
I
VBSTLK
VBST leakagecurrent V
VBST
= 26 V, LL = 20 V, T
A
= 25°C 0.1 1 μA
PROTECTIONS: OVERCURRENT LIMIT (OCL), UNDERCURRENT LIMIT (UCL)
(V
TRIP-GND
– V
PGND-LL
) voltage
V
OCL(off)
Overcurrent limit comparator offset –10 0 10 mV
V
TRIP-GND
= 60 mV
(V
TRIP-GND
– V
LL-PGND
) voltage
V
UCL(off)
Undercurrent limit comparator offset –9.5 0.5 10.5 mV
V
TRIP-GND
= 60 mV, EN_PSV=FLOAT
V
ZC(off)
Zero crossing comparator offset V
PGND-LL
voltage, V
EN_PSV
= 3.3V –9.5 0.5 10.5 mV
V
RTRIP
Current limit threshold setting range V
TRIP-GND
voltage
(2)
, T
A
= 25°C 30 mV
I
TRIP
TRIP source current V
TRIP
< 0.3 V, T
A
= 25°C 9 10 11 μA
Trip source current temperature
TC
ITRIP
T
A
= 25°C
(2)
4500 ppm/°C
coefficient
(1) Design constraint. Ensure actual on-time is greater than the maxiumum value (design R
T(on)
so that the minimum tolerance is 100 kΩ).
(2) Ensured by design. Not production tested.
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