PTH12010LAH datasheet(5/27 Pages) TI

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PTH12010W, PTH12010L

SLTS205E–JUNE 2003–REVISED APRIL 2006

ELECTRICAL CHARACTERISTICS (continued)

TA =25°C, Vi =12V,VO = 1.8 V, Ci = 560 µF, CO =0 µF, and IO =IOmax (Unless otherwise stated)

PTH12010L

CHARACTERISTICS

CONDITIONS

MIN

TYP

MAX

UNIT

IIL track

Track input current (pin 8)

Pin to GND

–0.13(15)

dVtrack/dt Track slew rate capability

CO≤ CO(max)

V/ms

Vi increasing

9.5

10.4

UVLO

Undervoltage lockout

Vi decreasing

8.8

Inhibit control (pin3)

VIH

Input high voltage

Referenced to GND

VI– 0.5

Open(4)

VIL

Input low voltage

–0.2

0.5

IIL

Input low current

Pin to GND

0.24

Ii inh

Input standby current

Inhibit (pin 3) to GND, Track (pin 8) open

Switching frequency

Over Vi and Io ranges

200

250

300

kHz

External input capacitance

560(16)

µF

nonceramic

330(17)

6,600(18)

Capacitance value

µF

External output capacitance

ceramic

300

Equivalent series resistance (nonceramic)

4(19)

mΩ

Per Bellcore TR-332

MTBF

Reliability

6.4

106 Hrs

50% stress, Ta =40°C, ground benign

(15) This control pin has an internal pull-up to the input voltage VI (7.5 V for pin 8). If it is left open-circuit the module operates when input

power is applied. A small, low-leakage (<100 nA) MOSFET or open-drain/collector voltage supervisor IC is recommended for control. Do

not place an external pull-up on this pin. For further information, see the related application section.

(16) A 560 µF electrolytic input capacitor is required for proper operation. The capacitor must be rated for a minimum of 800 mA rms of ripple

current.

(17) An external output capacitor is not required for basic operation. Adding 330 µF of distributed capacitance at the load improves the

transient response.

(18) This is the calculated maximum. The minimum ESR limitation oftens result in a lower value. When controlling the Track pin using a

voltage supervisor, CO(max) is reduced to 3300 µF. See the application notes for further guidance.

(19) This is the typical ESR for all the electrolytic (nonceramic) ouput capacitance. Use 7 mΩ as the minimum when using max-ESR values

to calculate.

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