IRU1237SC datasheet(3/7 Pages) IRF

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IRU1237SC

Rev. 1.2

07/14/03

www.irf.com

Ripple Rejection

(VCC to Output #1)

Ripple Rejection

(VCC to Output #2)

Ripple Rejection

(VDD to Output #3)

TJ Thermal Shutdown

Temperature Stability

Long Term Stability

RMS Output Noise

VCC Quiescent current

VDD Quiescent current

PARAMETER

SYM

TEST CONDITION

MIN

TYP

MAX

UNITS

150

0.5

0.3

0.003

%Vo

Note 7, 100Hz<f<100KHz, IO=IFL1/10

Note 7, 100Hz<f<100KHz, IO=IFL2/10

Note 7, 100Hz<f<100KHz, IO=IFL3/10

Note 7

Note 6 and 7, IO=10mA

Note 7, TJ=125

8C, 1000Hrs

Note 7, 10Hz<f<10KHz

IO1=IO2=IO3=0

PSRR1

PSRR2

PSRR3

TTHERM

StabTEMP

StabLONG

IQ1

IQ2

Note 1: Low duty cycle pulse testing with Kelvin con-

nections is required in order to maintain accurate data.

Note 2: Dropout voltage is defined as the minimum dif-

ferential voltage between VIN and VOUT required to main-

tain regulation at VOUT. It is measured when the output

voltage drops 1% below its nominal value.

Note 3: Transient response is defined with a step change

in load from 10mA to IFL/2, as the time from the load step

until the output voltage reaches its minimum value.

Note 4: Minimum load current is defined as the mini-

mum current required at the output in order for the out-

put voltage to maintain regulation.

Note 5: The regulator shall withstand 100,000 reverse

bias discharges of the maximum output capacitance,

with no degradation, when the input voltage is switched

to ground in 1

ms.

Note 6: Temperature stability is the change in output

from nominal over the operating temperature range.

Note 7: Guaranteed by design, but not tested in produc-

tion.

PIN#

PIN SYMBOL

PIN DESCRIPTION

Gnd26/33, Gnd8

V33

VCC

VDD

V26

These pins are connected to ground. It is also the tab of the device.

Output #1. Fixed regulator output (3.3V).

Positive unregulated supply input for the regulator. This pin must always be higher than

both VOUT pins by the amount of the dropout voltage in order for the device to regulate

properly. Bypass to ground with low ESR and ESL capacitance.

Output #3. Fixed regulator output (8V).

Input voltage to supply the base current for the pass transistor for both regulators.

Output #2. Fixed regulator output (2.6V).

PIN DESCRIPTIONS

1,4

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