SPX2941T5SLASHTR datasheet(3/10 Pages) SIPEX

3 / 10 page

Date: 08/25/04

SPX2941 1A Low Dropout Voltage Regulator

NOTE 1: Dropout voltage is defined as the input to output differential at which the output voltage drops to 99%

of its nominal value.

NOTE 2: V

IN=VOUT(NOMINAL)+1V; for example, VIN=4.3V for a 3.3V regulator. Employ pulse-testing procedures to

minimize temperature rise.

NOTE 3: Ground pin current is the regulator quiescent current. The total current drawn from the source is the

sum of the load and ground currents.

NOTE 4: Thermal regulation is defined as the change in the output voltage at a time T after a change in power

dissipation is applied, excluding load or line regulation effects.

NOTE 5: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the

nominal reference voltage measured 6V input. To express these thresholds in terms of output

voltage change, multiply the error amplifier gain = V

OUT/VREF = (R1 + R2)/R2.

For example, at a

programmable output voltage of 5V, the Error output is guaranteed to go low when the output drops

by 95mVx 5V/ 1.240V = 38mV. Threshold remain constant as a percent of V

OUT as VOUT is varied,

with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed.

NOTE 6: V

EN ≤ 0.8V and VIN ≤ 16V, VOUT = 0.

NOTE7: Maximum positive supply voltage of 20V must be of limited duration ( <100ms) and duty cycle (<1%).

The maximum continuous supply voltage is 16V.

NOTE 8: V

REF ≤ VOUT ≤ (VIN-1), 2.5V ≤ VIN ≤ 16V, 10 mA ≤ IC ≤ IFL, TJ < TJMAX.

Reference

Thermal

Shutdown

OUT

ADJ

GND

O.V

LIMIT

28V

R1*

R2*

1.180V

1.240V +

FLAG

Figure 2. SP2941 Block Diagram

BLOCK DIAGRAM

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