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LTM8055

8055fb

For more information www.linear.com/LTM8055

PIN FUNCTIONS

IOUTMON (Pin L2): Output Current Monitor. This pin pro-

duces a voltage that is proportional to the voltage between

VOUT and IOUT. IOUTMON will equal 1.2V when VOUT – IOUT

= 58mV. This feature is generally useful only if a current

sense resistor is applied between VOUT and IOUT. This is

a high impedance output. Use a buffer to drive a load.

IINMON (Pin L3): Input Current Monitor. This pin produces

a voltage that is proportional to the voltage between IIN

and VIN. IINMON will equal 1V when IIN – VIN = 50mV. This

feature is generally useful only if a current sense resistor

is applied between VIN and IIN.

RUN(PinL4):LTM8055Enable.RaisetheRUNpinvoltage

above 1.2V for normal operation. Above 1.2V (typical), but

below 6V, the RUN pin input bias current is less than 1μA.

Below 1.2V and above 0.3V, the RUN pin sinks 3μA so

the user can define the hysteresis with the external resis-

tor selection. This will also reset the soft-start function.

If RUN is 0.3V or less, the LTM8055 is disabled and the

SVIN quiescent current is below 1μA.

IIN (Pin L9): Input Current Sense. Tie this pin to the input

current sense resistor. The input average current sense

threshold is 50mV, so the LTM8055 will regulate the input

current to 50mV/RSENSE, where RSENSE is the value of the

input current sense resistor in ohms. Tie to VIN when not

used.Keepthispinwithin±0.5VofVINunderallconditions.

BLOCK DIAGRAM

0.2µF

4.7µH

0.47µF

50V

0.1µF

CTL

COMP

SYNC

100k

IOUTMON

8055 BD

IINMON

CLKOUT

IOUT

VOUT

GND

RUN

IIN

VIN

SVIN

BUCK-BOOST CONTROLLER

MODE

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