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LTC4370IDE#PBF

Dual ideal diode-OR controller, 2.9-40V, 15mV drop, N-ch MOSFET drive, DFN-14

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Pieza del fabricante：

LTC4370IDE#PBF

Paquete：

DFN-14 (4 x 3 x 0.75 mm)

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Descripción

Productos

The LTC4370IDE#PBF from Analog Devices is a dual ideal diode-OR controller with input supply monitoring in a 14-lead DFN (4×3 mm) package. It drives two external N-channel MOSFETs to create near-ideal diodes, reducing power dissipation compared to Schottky diodes while providing reverse-current protection and input supply monitoring for redundant power source ORing.

Especificaciones

Canales 2 (dual ideal diode)
Operating Voltage Range 2.9V to 40V
Forward Voltage Drop 15 mV typ (MOSFET Rdson dependent)
Reverse Current Block Yes (automatic)
Supply Current 160 µA typ (both channels)
MOSFET Gate Drive N-channel, 12V gate boost
Power Good Output Yes (open-drain)
Overvoltage Protection Adjustable (external divider)
Temperatura de funcionamiento -40°C to +85°C (I-grade)
Paquete DFN-14 (4 x 3 x 0.75 mm)

Características

  • Two independent ideal diode controllers in one package
  • 15 mV forward voltage drop (versus 300-500 mV for Schottky)
  • Automatic reverse-current blocking without external control
  • Internal 12V charge pump for N-channel MOSFET gate drive
  • Adjustable overvoltage and undervoltage thresholds per channel
  • Power good output for supply status monitoring

Aplicaciones

  • Redundant power supply ORing
  • High-availability server and telecom systems
  • Battery backup switchover circuits
  • Wall adapter / battery power path selection
  • Solar panel and battery ORing

The Analog Devices LTC4370IDE#PBF is a dual ideal diode-OR controller that drives two external N-channel MOSFETs to replace Schottky ORing diodes in redundant power supply systems. By actively controlling the MOSFET gate voltage to maintain a regulated 15 mV forward drop across each MOSFET, it dramatically reduces power dissipation compared to Schottky diodes (which typically drop 300-500 mV). If the input voltage falls below the output, the controller quickly turns off the MOSFET to block reverse current, preventing one supply from backfeeding into a failed or lower-voltage source. The internal 12V charge pump provides sufficient gate drive voltage for standard logic-level N-channel MOSFETs. Adjustable overvoltage and undervoltage thresholds per channel allow custom supply monitoring, while the power good output signals valid input supply status.

The LTC4370IDE#PBF controls two external N-channel MOSFETs to create near-ideal diodes. For each channel, a sense amplifier monitors the voltage drop across the MOSFET (from source to drain). In forward conduction, the controller drives the MOSFET gate to maintain a regulated 15 mV forward voltage drop. This ensures the MOSFET is fully enhanced (lowest Rdson) while providing a defined forward drop for current sharing between paralleled sources. When the input voltage drops below the output (indicating reverse current flow), the controller detects the polarity reversal and turns off the MOSFET within microseconds, blocking reverse current. The internal 12V charge pump boosts the gate drive above the source voltage to fully enhance standard N-channel MOSFETs. The overvoltage/undervoltage comparators monitor each input supply against externally-set thresholds and disable the MOSFET when the input is out of range, protecting downstream circuitry from voltage faults.

Pin Nombre Descripción
1 OUT Common Output Voltage Sense
2 INA Channel A Input Voltage Sense
3 GATEA Channel A MOSFET Gate Drive
4 OVEA Channel A Overvoltage Set Input
5 UVEA Channel A Undervoltage Set Input
6 GND Suelo
7 UVEB Channel B Undervoltage Set Input
8 OVEB Channel B Overvoltage Set Input
9 GATEB Channel B MOSFET Gate Drive
10 INB Channel B Input Voltage Sense
11 VCC Internal Supply (2.9-40V)
12 PGD Power Good Output (Open-Drain)
13 ES Enable Input
14 CPOUT Charge Pump Output (bypass cap)
  • Redundant PSU ORing: Dual ideal diode ORing for server and telecom N+1 redundant power supplies with 15 mV drop reducing heat by 95% vs Schottky
  • Batería de reserva: Automatic switchover between wall adapter and battery with reverse-current blocking preventing battery backfeed during adapter failure
  • Solar + Battery: ORing solar panel and battery sources with overvoltage protection on the solar input for load-dump transient protection
  • Industrial 24V Bus: Dual 24V supply ORing with undervoltage lockout disabling a failed supply rail while maintaining output from the healthy rail
  • Automotive Battery: 12V battery and alternator ORing with adjustable OV/UV thresholds for cold-crank and load-dump protection
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LTC4371IUFD ADI 4 2.9-40 QFN-28
LM5050-1MKT TI 1 2.9-75 SOT-23-6
TPS2412DR TI 1 3-16.5 SOIC-8
MAX40200AUK+ ADI 1 1.5-5.5 SOT-23-5
LTC4357CTS8 ADI 1 9-80 TSOT-23-8
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