Datasheet
ELECTRICAL CHARACTERISTICS
PTV08T250W
www.ti.com
.......................................................................................................................................... SLTS260E – OCTOBER 2005 – REVISED NOVEMBER 2008
T
A
= 25 ° C, V
I
= 12 V, V
O
= 3.3 V, C
I
= 560 µ F, C
O
= 660 F, and I
O
= I
O
max (unless otherwise stated)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
25 ° C, Natural Convection 0 50
(1)
I
O
Output current 8 V ≤ V
I
≤ 14 V A
60 ° C, 200 LFM airflow 0 48
(1)
V
I
Input voltage range Over I
O
range 8 14 V
V
O
tol Set-point voltage tolerance ± 2
(2)
%V
O
Δ Reg
temp
Temperature variation – 40 ° C < T
A
< 85 ° C ± 0.5 %V
O
Δ Reg
line
Line regulation Over V
I
range ± 3 mV
Δ Reg
load
Load regulation Over I
O
range ± 3 mV
Δ Reg
tot
Total output variation Includes set-point, line, load, – 40 ° C ≤ T
A
≤ 85 ° C ± 3
(2)
%V
O
Δ Reg
adj
Output adjust range 0.8 3.6 V
R
SET
= 2.49 k Ω , V
O
= 3.3 V 95
R
SET
= 6.98 k Ω , V
O
= 2.5 V 93
R
SET
= 13.0 k Ω , V
O
= 2 V 92
R
SET
= 16.9 k Ω , V
O
= 1.8 V 91
η Efficiency I
O
= 35 A %
R
SET
= 27.4 k Ω , V
O
= 1.5 V 90
R
SET
= 53.6 k Ω , V
O
= 1.2 V 88
R
SET
= 113.0 k Ω , V
O
= 1 V 86
R
SET
= open circuit, V
O
= 0.8 V 82
V
O
ripple (peak-to-peak) 20-MHz bandwidth All voltages 15 mV
PP
I
O
trip Overcurrent threshold Reset, followed by auto-recovery 75 100 115 A
t
tr
w/o TurboTrans Recovery time 50 µ s
Δ V
tr
C
O
= 660 µ F V
O
over/undershoot 130 mV
t
tr
w/o TurboTrans Recovery time 50 µ s
2.5 A/ µ s load step
Transient response
50 to 100% I
O
max
Δ V
tr
C
O
= 3300 µ F, Type C V
O
over/undershoot 85 mV
t
trTT
w/ TurboTrans Recovery time 50 µ s
Δ V
trTT
C
O
= 3300 µ F, Type C V
O
over/undershoot 50 mV
I
IL
track Track input current (pin 15) Pin to GND – 0.13
(3)
mA
dV
track
/dt Track slew rate capability C
O
≤ C
O
(max) 1 V/ms
V
I
Increasing 7.5
(4)
7.8
Undervoltage lockout
UVLO Pin 16 open V
threshold
V
I
Decreasing 6.5
(4)
Inhibit control (pin 16)
V
IH
Input high voltage Referenced to GND 2.5 Open
(5)
V
V
IL
Input low voltage Referenced to GND – 0.2 0.5
I
IL
inhibit Input low current Pin to GND 0.5 mA
I
I
inh Input standby current Inhibit pin (16) to GND 35 mA
f
s
Switching frequency Over V
I
and I
O
ranges 900 1050 1200 kHz
C
I
External input capacitance 560
(6)
µ F
(1) See SOA curves or consult factory for appropriate derating.
(2) The set-point voltage tolerance is affected by the tolerance of R
SET
. The stated limit is unconditionally met if R
SET
has a tolerance of 1%
with 100 ppm/ ° C or better temperature stability.
(3) This control pin has an internal pull-up to 5 V. A small, low-leakage ( < 100 nA) MOSFET or open-drain/collector voltage supervisor IC is
recommended to control this pin. For further information, see the related application section.
(4) These are the default voltages. They may be adjusted using the UVLO Prog control input. See the Application Information section for
further guidance.
(5) This control pin has an internal pull-up to 5 V. When left open-circuit the module operates when input power is applied. A small,
low-leakage ( < 100 nA) MOSFET is recommended to control this pin. For further information, see the related application section.
(6) A minimum capacitance of 560- µ F is required at the input for proper operation. For best results, 1000 µ F is recommended. The
capacitance must be rated for a minimum of 300 mArms of ripple current.
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