Datasheet LTM8001 (Analog Devices) - 10

LTM8001
pin FuncTions
the absolute maximum voltage rating of 6V through a 20% lower than the SYNC pulse frequency. Do not leave resistor, provided the pin current does not exceed 100µA. this pin open.
FB0 (Pin L5):
The LTM8001 regulates its FB0 pin to 1.19V.
ILIM (Pin L8):
The ILIM pin reduces the maximum regulated Connect the adjust resistor from this pin to ground. The output current of the LTM8001. The maximum control volt- value of RFB0 is given by the equation: 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. R 11.9 FBO =
SET1, SET2, SET3, SET4, SET5 (Pins L9, H11, G11, D11,
VOUT –1.19
A9):
These pins set the regulation point for each LDO. A where RFB0 is in kΩ. fixed current of 10μA flows out of this pin through a single
COMP (Pin L6):
Compensation Pin. This pin is generally external resistor, which programs the output voltage of not used. The LTM8001 is internally compensated, but the device. Output voltage range is zero to the absolute some rare situations may arise that require a modifica- maximum rated output voltage. The transient performance tion to the control loop. This pin connects directly to the can be improved by adding a small capacitor from the input PWM comparator of the LTM8001. In most cases, SET pin to ground. no adjustment is necessary. If this function is not used,
VOUT1 (Pins L10, L11), VOUT2 (Pins J11, K11), VOUT3 (Pins
leave this pin open.
E11, F11), VOUT4 (Pins B11, C11), VOUT5 (Pins A10, A11): RT (Pin L7):
The RT pin is used to program the switch- These are the power outputs of the individual LDOs. There ing frequency of the LTM8001 by connecting a resistor must be a minimum load current of 1mA or the output may from this pin to ground. The Applications Information not regulate. The internal LDOs are rated for positive volt- section of the data sheet includes a table to determine the ages between their inputs and outputs. Avoid applications recommended resistance value and switching frequency. where the internal LDOs can experience a negative voltage, When using the SYNC function, set the frequency to be even during start-up and turn-off transients
block DiagraM
2.2µH V R IN0 SENSE VOUT0 VOUT1 0.2µF 10k 2.2µF 1.1A LDO SET1 VOUT2 1.1A LDO SET2 VOUT3 RUN 1.1A LDO SET3 SS CURRENT SYNC V MODE INTERNAL V OUT4 IN0 CONTROLLER REGULATOR V 1.1A LDO REF SET4 V ILIM OUT5 1.1A LDO SET5 COMP GND RT FB0 BIAS123 BIAS45 VIN45 8001 BD 8001fd 10 For more information www.linear.com/LTM8001 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Package Photo Revision History Typical Application Related Parts