Datasheet LTM8021 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | 36VIN, 500mA Step-Down DC/DC µModule |
| Pages / Page | 18 / 6 — pin FuncTions. VIN (Bank 1):. OUT (Bank 2):. GND (Bank 3):. BIAS (Pin … |
| File Format / Size | PDF / 388 Kb |
| Document Language | English |
pin FuncTions. VIN (Bank 1):. OUT (Bank 2):. GND (Bank 3):. BIAS (Pin H3):. ADJ (Pin A2):. RUN/SS (Pin A1):. block DiagraM
Model Line for this Datasheet
Text Version of Document
LTM8021
pin FuncTions VIN (Bank 1):
The VIN pin supplies current to the LTM8021’s If the shutdown feature is not used, tie this pin to the VIN internal regulator and to the internal power switch. This pin. The RUN/SS also provides soft-start and frequency pin must be locally bypassed with an external, low ESR foldback. To use the soft-start function, connect a resistor capacitor of at least 1µF. and capacitor to this pin. Do not allow the RUN/SS pin to
V
rise above V
OUT (Bank 2):
Power Output Pins. An external capacitor is IN. See the Applications Information section. connected from VOUT to GND in most applications. Apply
GND (Bank 3):
The GND connections serve as the main output load between these pins and GND pins. signal return and the primary heat sink for the LTM8021. Tie
BIAS (Pin H3):
The BIAS pin connects to the internal the GND pins to a local ground plane below the LTM8021 boost Schottky diode and to the internal regulator. Tie to and the circuit components. Return the feedback divider VOUT when VOUT > 3V or to another DC voltage greater to this signal. than 3V otherwise. When BIAS > 3V the internal circuitry
ADJ (Pin A2):
The LTM8021 regulates its ADJ pin to will be powered from this pin to improve efficiency. Main 0.8V. Connect the adjust resistor from this pin to ground. regulator power will still come from VIN. The value of RADJ is given by the equation, RADJ = 80/
RUN/SS (Pin A1):
Tie RUN/SS pin to ground to shut down (VOUT – 0.8), where RADJ is in k. the LTM8021. Tie to 1.6V or more for normal operation.
block DiagraM
VIN 10µH VOUT 0.1µF 15pF 100k 10µF 1% BIAS CURRENT MODE CONTROLLER RUN/SS GND ADJ 8021 BD 8021fd 6 For more information www.linear.com/LTM8021 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Package Photo Typical Application Related Parts
pin FuncTions VIN (Bank 1):
The VIN pin supplies current to the LTM8021’s If the shutdown feature is not used, tie this pin to the VIN internal regulator and to the internal power switch. This pin. The RUN/SS also provides soft-start and frequency pin must be locally bypassed with an external, low ESR foldback. To use the soft-start function, connect a resistor capacitor of at least 1µF. and capacitor to this pin. Do not allow the RUN/SS pin to
V
rise above V
OUT (Bank 2):
Power Output Pins. An external capacitor is IN. See the Applications Information section. connected from VOUT to GND in most applications. Apply
GND (Bank 3):
The GND connections serve as the main output load between these pins and GND pins. signal return and the primary heat sink for the LTM8021. Tie
BIAS (Pin H3):
The BIAS pin connects to the internal the GND pins to a local ground plane below the LTM8021 boost Schottky diode and to the internal regulator. Tie to and the circuit components. Return the feedback divider VOUT when VOUT > 3V or to another DC voltage greater to this signal. than 3V otherwise. When BIAS > 3V the internal circuitry
ADJ (Pin A2):
The LTM8021 regulates its ADJ pin to will be powered from this pin to improve efficiency. Main 0.8V. Connect the adjust resistor from this pin to ground. regulator power will still come from VIN. The value of RADJ is given by the equation, RADJ = 80/
RUN/SS (Pin A1):
Tie RUN/SS pin to ground to shut down (VOUT – 0.8), where RADJ is in k. the LTM8021. Tie to 1.6V or more for normal operation.
block DiagraM
VIN 10µH VOUT 0.1µF 15pF 100k 10µF 1% BIAS CURRENT MODE CONTROLLER RUN/SS GND ADJ 8021 BD 8021fd 6 For more information www.linear.com/LTM8021 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Package Photo Typical Application Related Parts
