Datasheet LTM8020 (Analog Devices) - 5
| Hersteller | Analog Devices |
| Beschreibung | 200mA, 36V DC/DC µModule Regulator |
| Seiten / Seite | 16 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. … |
| Dateiformat / Größe | PDF / 406 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Temperature Rise vs Input. Turn-On Behavior
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LTM8020
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Temperature Rise vs Input Turn-On Behavior Voltage (Full Load, TA = 25°C) (6VIN, 3.3VOUT, No Load) Radiated Emissions
25 90 INPUT CURRENT 36VIN 80 100mA/DIV 5VOUT 20 5V FULL LOAD OUT 70 VOUT 2V/DIV 60 15 SHDN 50 EN55022 3.3V 5V/DIV 40 CLASS B LIMIT TURE RISE (°C) OUT 50µs/DIV 8020 G14 10 30 20 TEMPERA 5 EMISSIONS LEVEL (dBµV/m) 10 0 0 –10 0 10 20 30 40 50 0 200 400 600 800 1000 INPUT VOLTAGE (V) FREQUENCY (MHz) 8020 G13 8020 G15
PIN FUNCTIONS VIN (Pins A1, A2):
The VIN pins supply current to the
SHDN (Pin C1):
The SHDN pin is used to put the LTM8020 in LTM8020’s internal regulator and to the internal power shutdown mode. Tie to ground to shut down the LTM8020. switch. These pins must be locally bypassed with an Apply 2V or more for normal operation. If the shutdown external, low ESR capacitor of at least 1µF. feature is not used, tie this pin to VIN.
VOUT (Pins A4, A5, B4, B5, C4, C5):
Power Output Pins.
GND (Pins C2, D1, D2, D3, D4, D5, E2, E3, E4, E5):
The An external capacitor is connected from VOUT to GND in GND connections serve as the main signal return and the most applications. Apply output load between these pins primary heat sink for the LTM8020. Tie the GND pins to and GND. a local ground plane below the LTM8020 and the circuit
BIAS (Pin C3):
The BIAS pin connects to the internal components. Return the feedback divider to this signal. boost Schottky diode and to the internal regulator. Tie to
ADJ (Pin E1):
The LTM8020 regulates its ADJ pin to 1.25V. VOUT when VOUT > 3V or to another DC voltage greater Connect the adjust resistor from this pin to GND. The than 3V otherwise. When BIAS > 3V the internal circuitry value of this adjust resistor is determined by the equation will be powered from this pin to improve efficiency. Main RADJ = 623.75/(VOUT – 1.25), where RADJ is in kW. Note regulator power will still come from VIN. that the ADJ pin is open circuit if VOUT = 1.25V. 8020fe For more information www.linear.com/LTM8020 5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Temperature Rise vs Input Turn-On Behavior Voltage (Full Load, TA = 25°C) (6VIN, 3.3VOUT, No Load) Radiated Emissions
25 90 INPUT CURRENT 36VIN 80 100mA/DIV 5VOUT 20 5V FULL LOAD OUT 70 VOUT 2V/DIV 60 15 SHDN 50 EN55022 3.3V 5V/DIV 40 CLASS B LIMIT TURE RISE (°C) OUT 50µs/DIV 8020 G14 10 30 20 TEMPERA 5 EMISSIONS LEVEL (dBµV/m) 10 0 0 –10 0 10 20 30 40 50 0 200 400 600 800 1000 INPUT VOLTAGE (V) FREQUENCY (MHz) 8020 G13 8020 G15
PIN FUNCTIONS VIN (Pins A1, A2):
The VIN pins supply current to the
SHDN (Pin C1):
The SHDN pin is used to put the LTM8020 in LTM8020’s internal regulator and to the internal power shutdown mode. Tie to ground to shut down the LTM8020. switch. These pins must be locally bypassed with an Apply 2V or more for normal operation. If the shutdown external, low ESR capacitor of at least 1µF. feature is not used, tie this pin to VIN.
VOUT (Pins A4, A5, B4, B5, C4, C5):
Power Output Pins.
GND (Pins C2, D1, D2, D3, D4, D5, E2, E3, E4, E5):
The An external capacitor is connected from VOUT to GND in GND connections serve as the main signal return and the most applications. Apply output load between these pins primary heat sink for the LTM8020. Tie the GND pins to and GND. a local ground plane below the LTM8020 and the circuit
BIAS (Pin C3):
The BIAS pin connects to the internal components. Return the feedback divider to this signal. boost Schottky diode and to the internal regulator. Tie to
ADJ (Pin E1):
The LTM8020 regulates its ADJ pin to 1.25V. VOUT when VOUT > 3V or to another DC voltage greater Connect the adjust resistor from this pin to GND. The than 3V otherwise. When BIAS > 3V the internal circuitry value of this adjust resistor is determined by the equation will be powered from this pin to improve efficiency. Main RADJ = 623.75/(VOUT – 1.25), where RADJ is in kW. Note regulator power will still come from VIN. that the ADJ pin is open circuit if VOUT = 1.25V. 8020fe For more information www.linear.com/LTM8020 5