Datasheet
PTH08T260W, PTH08T261W
www.ti.com
SLTS272G –DECEMBER 2006– REVISED AUGUST 2011
ELECTRICAL CHARACTERISTICS
T
A
=25°C, V
I
= 5 V, V
O
= 3.3 V, C
I
= 330 µF, C
O
1 = 200 µF ceramic, and I
O
= I
O
max (unless otherwise stated)
PARAMETER TEST CONDITIONS PTH08T261W
MIN TYP MAX UNIT
I
O
Output current Over V
O
range 25°C, natural convection 0 3 A
0.69 ≤ V
O
≤ 1.2 4.5 14
(1)
V
I
Input voltage range Over I
O
range 1.2 < V
O
≤ 3.6 4.5 14 V
3.6 < V
O
≤ 5.5 V
O
+1
(2)
14
Output adjust range Over I
O
range 0.69 5.5 V
Set-point voltage tolerance ±1.0
(3)
%V
o
Temperature variation –40°C < T
A
< 85°C ±0.25 %V
o
V
O
Line regulaltion Over V
I
range ±3 mV
Load regulation Over I
O
range ±2 mV
Total output variation Includes set-point, line, load, –40°C ≤ T
A
≤ 85°C ±1.5
(3)
%V
O
R
SET
= 169 Ω, V
I
= 8.0 V, V
O
= 5.0V 95%
R
SET
= 1.21 kΩ, V
O
= 3.3 V 92%
R
SET
= 2.37 kΩ, V
O
= 2.5 V 90%
R
SET
= 4.75 kΩ, V
O
= 1.8 V 88%
η Efficiency I
O
= 3 A
R
SET
= 6.98 kΩ, V
O
= 1.5 V 87%
R
SET
= 12.1 kΩ, V
O
= 1.2 V 85%
R
SET
= 20.5 kΩ, V
O
= 1.0 V 83%
R
SET
= 681 kΩ, V
O
= 0.7 V 79%
V
O
Ripple (peak-to-peak) 20-MHz bandwidth 1
(1)
%V
O
I
LIM
Overcurrent threshold Reset, followed by auto-recovery 5.5 A
Recovery Time 50 µSec
w/o TurboTrans
C
O
1 = 200 μF, ceramic
V
O
Overshoot 43 mV
2.5 A/µs load step
Recovery Time 70 µSec
w/o TurboTrans
(4)
50% to 100% I
O
max
Transient response
C
O
1 = 400 μF, ceramic
V
I
= 12 V
V
O
Overshoot 38 mV
V
O
= 3.3 V
with TurboTrans Recovery Time 130 µSec
C
O
1 = 400 μF, ceramic
V
O
Overshoot 23 mV
R
TT
= 8.06 kΩ
I
IL
Track input current (pin 9) Pin to GND -130
(5)
µA
dV
track
/dt Track slew rate capability C
O
≤ C
O
(max) 1 V/ms
V
I
increasing, R
UVLO
= OPEN 4.3 4.45
Adjustable Under-voltage lockout
UVLO
ADJ
V
I
decreasing, R
UVLO
= OPEN 3.7 4.2 V
(pin 10)
Hysteresis, R
UVLO
≤ 52.3 kΩ 0.5
Input high voltage (V
IH
) Open
(6)
V
Inhibit control (pin 10) Input low voltage (V
IL
) -0.2 0.6
Input low current (I
IL
), Pin 10 to GND 235 µA
I
in
Input standby current Inhibit (pin 10) to GND, Track (pin 9) open 5 mA
f
s
Switching frequency Over V
I
and I
O
ranges, SmartSync (pin 1) to GND 300 kHz
f
SYNC
Synchronization (SYNC) frequency 240 400 kHz
V
SYNCH
SYNC High-Level Input Voltage 2 5.5 V
SmartSync Control
V
SYNCL
SYNC Low-Level Input Voltage 0.8 V
t
SYNC
SYNC Minimum Pulse Width 200 nSec
(1) For output voltages ≤ 1.2 V, at nominal operating frequency, the output ripple may increase (typically 2×) when operating at input
voltages greater than (V
O
× 11). When using the SmartSync feature to adjust the switching frequency, see the SmartSync
Considerations section of the datasheet for further guidance.
(2) The minimum input voltage is 4.5V or (V
O
+1)V, whichever is greater. Additional input capacitance may be required when V
I
< (V
O
+2)V.
(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 100 ppm/°C or better temperature stability.
(4) Without TurboTrans, the minimum ESR limit of 7 mΩ must not be violated.
(5) A low-leakage (<100 nA), open-drain device, such as MOSFET or voltage supervisor IC, is recommended to control pin 9. The
open-circuit voltage is less than 6.5 Vdc.
(6) This control pin has an internal pull-up. Do not place an external pull-up on this pin. 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. For additional information, see the related
application information section.
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