PTH08T261WAS datasheet(6/36 Pages) TI

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ELECTRICAL CHARACTERISTICS

PTH08T260W, PTH08T261W

SLTS272A – DECEMBER 2006 – REVISED MAY 2007

A =25°C, VI = 5 V, VO = 3.3 V, CI = 330 µF, CO1 = 200 µF ceramic, and IO = IO max (unless otherwise stated)

PARAMETER

TEST CONDITIONS

PTH08T261W

MIN

TYP

MAX

UNIT

Output current

Over VO range

°C, natural convection

0.69

≤ V

O≤ 1.2

4.5

VO(1)

Input voltage range

Over IO range

1.2 < VO≤ 3.6

4.5

3.6 < VO≤ 5.5

VO +1(2)

Output adjust range

Over IO range

0.69

5.5

Set-point voltage tolerance

±1.0 (3)

%Vo

Temperature variation

–40

°C < T

A < 85°C

±0.25

%Vo

Line regulaltion

Over VI range

±3

Load regulation

Over IO range

±2

Total output variation

Includes set-point, line, load, –40

°C ≤ T

A ≤ 85°C

±1.5 (3)

%VO

RSET = 169 Ω, VI = 8.0 V, VO = 5.0V

95%

RSET = 1.21 kΩ, VO = 3.3 V

92%

RSET = 2.37 kΩ, VO = 2.5 V

90%

RSET = 4.75 kΩ, VO = 1.8 V

88%

Efficiency

IO = 3 A

RSET = 6.98 kΩ, VO = 1.5 V

87%

RSET = 12.1 kΩ, VO = 1.2 V

85%

RSET = 20.5 kΩ, VO = 1.0 V

83%

RSET = 681 Ω, VO = 0.7 V

79%

VO Ripple (peak-to-peak)

20-MHz bandwidth

%VO

ILIM

Overcurrent threshold

Reset, followed by auto-recovery

5.5

Recovery Time

µSec

w/o TurboTrans

CO1 = 200 µF, ceramic

VO Overshoot

2.5 A/µs load step

Recovery Time

µSec

w/o TurboTrans (4)

50% to 100% IOmax

Transient response

CO1 = 400 µF, ceramic

VI = 12 V

VO Overshoot

VO = 3.3 V

with TurboTrans

Recovery Time

130

µSec

CO1 = 400 µF, ceramic

VO Overshoot

RTT = 8.06 kΩ

IIL

Track input current (pin 9)

Pin to GND

-130 (5)

µA

dVtrack/dt

Track slew rate capability

CO ≤ CO (max)

V/ms

VI increasing, RUVLO = OPEN

4.3

4.45

Adjustable Under-voltage lockout

UVLOADJ

VI decreasing, RUVLO = OPEN

4.0

4.2

(pin 10)

Hysteresis, RUVLO≤ 52.3 kΩ

0.5

Input high voltage (VIH)

Open(6)

Inhibit control (pin 10)

Input low voltage (VIL)

-0.2

0.6

Input low current (IIL), Pin 10 to GND

235

µA

Iin

Input standby current

Inhibit (pin 10) to GND, Track (pin 9) open

f s

Switching frequency

Over VI and IO ranges, SmartSync (pin 1) to GND

300

kHz

(1)

The maximum input voltage is duty cycle limited to (VO× 11)V or 14V, whichever is less. The maximum allowable input voltage is a

function of switching frequency, and may increase or decrease when the SmartSync feature is used. Please review the SmartSync

section of the Application Information for further guidance.

(2)

The minimum input voltage is 4.5V or (VO+1)V, whichever is greater. Additional input capacitance may be required when VI < (VO+2)V.

(3)

The set-point voltage tolerance is affected by the tolerance and stability of RSET. The stated limit is unconditionally met if RSET has a

tolerance of 1% with 100 ppm/°C or better temperature stability.

(4)

Without TurboTrans, the minimum ESR limit of 7 m

Ω 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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