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PTH12020W/L

SLTS208E–MAY 2003–REVISED OCTOBER 2005

ELECTRICAL CHARACTERISTICS (continued)

PTH12020L

PARAMETER

TEST CONDITIONS

UNIT

MIN

TYP

MAX

Margin input current (pins 9 /10)

Pin to GND

µA

Track input current (pin 8)

Pin to GND

mA

Track slew rate capability

1V/ms

9.7

10.4

UVLO

Undervoltage lockout

V

8.8

9.2

Inhibit control (pin 3)

2

Input high voltage

Referenced to GND

V

Input low voltage

–0.2

0.5

Input low current

Pin to GND

0.24

mA

Input standby current

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

5

mA

Switching frequency

200

250

300

kHz

External input capacitance

µF

Non-ceramic

0

Capacitance value

µF

External output capacitance

Ceramic

0

300

Equivalent series resistance (non-ceramic)

mΩ

MTBF

Reliability

5.3

(3) A small low-leakage (<100 nA) MOSFET is recommended to control this pin. The open-circuit voltage is less than 1 Vdc.

(4) This control pin is pulled up to an internal supply voltage. To avoid risk of damage to the module, do not apply an external voltage

greater than 7 V. If this input is left open-circuit the module will operate when input power is applied. A small low-leakage (<100 nA)

MOSFET or open-drain/collector voltage supervisor IC is recommended for control. For further information, consult the related

application note.

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

current.

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

transient response.

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

voltage supervisor, the maximum output capacitance is reduced to 6600 µF. Consult the application notes for further guidance.

(8) This is the typical ESR for all the electrolytic (non-ceramic) output capacitance. Use 7 mΩ as the minimum when using max-ESR values

to calculate.

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