LTM4613 datasheet(10/28 Pages) LINER

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LTM8001

8001f

For more information www.linear.com/8001

BLOCK DIAGRAM

CURRENT

MODE

CONTROLLER

2.2µH

10k

0.2µF

2.2µF

VIN0

RUN

COMP

ILIM

VREF

SYNC

RSENSE

VOUT0

VOUT1

SET1

INTERNAL

REGULATOR

VIN0

GND

FB0

BIAS123

BIAS45 VIN45

1.1A LDO

VOUT2

SET2

1.1A LDO

VOUT3

SET3

1.1A LDO

VOUT4

SET4

1.1A LDO

VOUT5

SET5

8001 BD

1.1A LDO

the absolute maximum voltage rating of 6V through a

resistor, provided the pin current does not exceed 100µA.

FB0 (Pin L5): The LTM8001 regulates its FB0 pin to 1.19V.

Connect the adjust resistor from this pin to ground. The

value of RFB0 is given by the equation:

RFBO =

11.9

VOUT –1.19

where RFB0 is in kΩ.

COMP (Pin L6): Compensation Pin. This pin is generally

not used. The LTM8001 is internally compensated, but

some rare situations may arise that require a modifica-

tion to the control loop. This pin connects directly to the

input PWM comparator of the LTM8001. In most cases,

no adjustment is necessary. If this function is not used,

leave this pin open.

RT (Pin L7): The RT pin is used to program the switch-

ing frequency of the LTM8001 by connecting a resistor

from this pin to ground. The Applications Information

section of the data sheet includes a table to determine the

recommended resistance value and switching frequency.

When using the SYNC function, set the frequency to be

20% lower than the SYNC pulse frequency. Do not leave

this pin open.

ILIM(PinL8):TheILIMpinreducesthemaximumregulated

outputcurrentoftheLTM8001.Themaximumcontrolvolt-

age range is 1.5V. ILIM voltages above 1.5V have little or

no effect. If this function is not used, tie this pin to VREF.

SET1, SET2, SET3, SET4, SET5 (Pins L9, H11, G11, D11,

A9): These pins set the regulation point for each LDO. A

fixed current of 10μA flows out of this pin through a single

external resistor, which programs the output voltage of

the device. Output voltage range is zero to the absolute

maximumratedoutputvoltage.Thetransientperformance

can be improved by adding a small capacitor from the

SET pin to ground.

VOUT1(PinsL10,L11),VOUT2(PinsJ11,K11),VOUT3(Pins

E11,F11),VOUT4(PinsB11,C11),VOUT5(PinsA10,A11):

These are the power outputs of the individual LDOs. There

must be a minimum load current of 1mA or the output may

not regulate. The internal LDOs are rated for positive volt-

ages between their inputs and outputs. Avoid applications

wheretheinternalLDOscanexperienceanegativevoltage,

even during start-up and turn-off transients

PIN FUNCTIONS

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