Datasheet

ELECTRICAL CHARACTERISTICS
PTR08100W
www.ti.com ....................................................................................................................................................... SLTS284E – AUGUST 2007 – REVISED APRIL 2009
at 25 ° C free-air temperature, V
I
= 12 V, V
O
= 3.3 V, I
O
= I
O
(Max), C
I
= 100 µ F, C
O
= 100 µ F (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
O
Output current T
A
= 50 ° C, 200LFM airflow 0 10 A
0.6 V ≤ V
O
≤ 3.6 4.5 14
(1)
V
I
Input voltage range Over I
O
range V
3.6 V < V
O
≤ 5.5 V
O
/0.83
(2)
14
V
O(adj)
Output voltage adjust range Over I
O
range 0.6 5.5 V
Set-point voltage tolerance T
A
= 25 ° C ± 2
(3)
% V
O
Temperature variation -40 ° C ≤ T
A
≤ +85 ° C ± 0.2 % V
O
V
O
Line regulation Over V
I
range ± 0.3 % V
O
Load regulation Over I
O
range ± 0.5 % V
O
Total output voltage variation Includes set-point, line, load, – 40 ° C ≤ T
A
≤ +85 ° C ± 3
(3)
% V
O
R
SET
= 267 Ω , V
I
= 12 V, V
O
= 5 V
(2)
92 %
R
SET
= 432 Ω , V
O
= 3.3 V
(2)
95 %
R
SET
= 619 Ω , V
O
= 2.5 V 93 %
T
A
= 25 ° C
R
SET
= 976 Ω , V
O
= 1.8 V 91 %
η Efficiency V
I
= 5 V
R
SET
= 1.3 k Ω , V
O
= 1.5 V 90 %
I
O
= 5 A
R
SET
= 1.91 k Ω , V
O
= 1.2 V 88 %
R
SET
= 2.87 k Ω , V
O
= 1 V 86 %
R
SET
= 10.7 k Ω , V
O
= 0.7 V 84 %
Output voltage ripple 20 MHz bandwith 50 mV
PP
I
LIM
Overcurrent threshold Reset, followed by autorecovery 16 A
Recovery time 50 µ s
2.5 A/ µ s load step
Transient response
V
O
from 50 to 100% I
O
max
150 mV
over/undershoot
V
I
= increasing 4.25 4.4
UVLO Undervoltage lockout V
V
I
= decreasing 3.8 3.95
Input high voltage (V
IH
) 2.8 6
(4)
V
Inhibit control (pin 1) Input low voltage (V
IL
) – 0.3 0.6
Input low current (I
IL
) – 125 µ A
I
I(stby)
Input standby current Pin 1 to GND 1 mA
F
S
Switching frequency Over V
I
and I
O
ranges 300 kHz
C
I
External input capacitance 100
(5)
µ F
Non-ceramic 100
(6)
3000
(7)
µ F
C
O
External output capacitance Ceramic 22
(6)
100
Equivalent series resistance (non-ceramic) 5
(8)
m Ω
Per Bellcore TR-332, 50% stress,
MTBF Calculated reliability 13.7
10
6
Hrs
T
A
= 40 ° C, ground benign
(1) For output voltages less than 1.0 V, the output ripple may increase (up to 2 × ) when operating at input voltages greater than (V
O
× 15).
(2) The minimum input voltage is 4.5 V or (V
O
/0.83) V, whichever is greater.
(3) The set-point voltage tolerance is affected by the tolerance and stability of R
SET
. The stated limit is unconditionally met if R
SET
has a
tolerance of 1% with with 100 ppm/ ° C or better temperature stability.
(4) This control pin has an internal pullup to the input voltage V
I
. If it is left open circuit, the module operates when input power is applied. A
small low-leakage ( < 100 nA) MOSFET is recommended for control. Do not tie the inhibit pin to V
I
or to another module ' s inhibit pin. See
the application section for further guidance.
(5) An external 100- µ F bulk capacitor is required across the input (V
I
and GND) for proper operation. Locate the capacitor close to the
module.
(6) An external 100- µ F non-ceramic capacitor is required across the output (V
O
and GND) for proper operation. Locate the capacitor close
to the module. Adding additional capacitance close to the load improves the response of the regulator to load transients.
(7) This is the calculated maximum capacitance. The minimum ESR limitation often results in a lower value. See the capacitor application
information for further guidance.
(8) This is the typical ESR for all the non-ceramic capacitance. Use 7 m Ω as the minimum when calculating the total equivalent series
resistance (ESR) using the max-ESR values specified by the capacitor manufacturer.
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