PTH12020LAH datasheet(4/27 Pages) TI

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ELECTRICAL CHARACTERISTICS

PTH12020W/L

SLTS208E–MAY 2003–REVISED OCTOBER 2005

ELECTRICAL CHARACTERISTICS (continued)

TA =25°C, VI =12 V, VO = 3.3 V, CI = 560 µF, CO =0 µF, and Io =Iomax) (unless otherwise noted)

PTH12020W

PARAMETER

TEST CONDITIONS

UNIT

MIN

TYP

MAX

Vin increasing

9.7

10.4

UVLO

Undervoltage lockout

Vin decreasing

8.8

9.2

Inhibit control (pin 3)

VIH

Open(4)

Input high voltage

Referenced to GND

VIL

Input low voltage

–0.2

0.5

IIL inhibit

Input low current

Pin to GND

0.24

Iin inh

Input standby current

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

ƒs

Switching frequency

Over Vin and Io ranges

260

320

380

kHz

External input capacitance

560 (5)

µF

Non-ceramic

330 (6)

9900 (7)

Capacitance value

µF

External output capacitance

Ceramic

300

Equivalent series resistance (non-ceramic)

4 (8)

mΩ

MTBF

Reliability

Per Bellcore TR-332, 50% stress, TA =40°C, ground benign

5.3

106 Hrs

(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.

TA =25°C, VI =12 V, VO = 3.3 V, CI = 560 µF, CO =0 µF, and Io =Iomax) (unless otherwise noted)

PTH12020L

PARAMETER

TEST CONDITIONS

UNIT

MIN

TYP

MAX

60°C, 200 LFM airflow

18(1)

Output current

25°C, natural convection

18(1)

Vin

Input voltage range

Over Io range

10.8

13.2

Votol

Set-point voltage tolerance

±2 (2)

%Vo

∆Regtemp

Temperature variation

–40°C <TA <85°C

±0.5

%Vo

∆Regline

Line regulation

Over Vin range

±5mV

∆Regload

Load regulation

Over Io range

±5mV

∆Regtot

Total output variation

Includes set-point, line, load, –40°C ≤ TA≤ 85°C±3 (2)

%Vo

∆Vadj

Output voltage adjust range

Over Vin range

0.8

1.8

RSET = 130 Ω,Vo = 1.8 V

89%

RSET =3.57kΩ,Vo = 1.5 V

87%

Efficiency

IO =12A

RSET = 12.1 kΩ,Vo = 1.2 V

85%

RSET = 32.4 kΩ,Vo = 1.0 V

83%

RSET = open cct., Vo = 0.8 V

80%

Vo ripple (pk-pk)

20 MHz bandwidth

Vo >2.5 V

%Vo

Io trip

Over-current threshold

Reset, followed by auto-recovery

ttr

Recovery time

µSec

1A/µs load step, 50 to

Transient response

100% Iomax,Cout = 330 µF

∆Vtr

Vo over/undershoot

∆Vomargin

Margin up/down adjust

±5%

(1) See SOA curves or consult factory for appropriate derating.

(2) 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.

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