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TPS2065CDBVR

1A adjustable current-limit switch, 50mOhm, auto-retry, SOT-23-5

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Manufacturer Part：

TPS2065CDBVR

Package：

SOT-23-5 (2.9 x 1.6 x 1.1 mm, DBV package)

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Description

Product Overview

The TPS2065CDBVR from Texas Instruments is a 1A current-limited power distribution switch with auto-retry, 50mOhm RDS(on), and adjustable current limit in SOT-23-5 package.

Key Specifications

Function Current-Limited Power Distribution Switch
Input Voltage 2.7V to 5.5V
Current Limit 0.5A to 1.5A (adjustable via external resistor)
RDS(on) 50 mOhm (typical)
Fault Response Auto-retry (continuous retry after fault clears)
Fault Output (OC) Active low, open-drain
Enable Active high
UVLO Yes (2.4V typical)
Thermal Shutdown Yes
Package SOT-23-5 (DBV)
Operating Temperature -40 to +85 C

Features

  • 50mOhm low RDS(on) for minimal voltage drop
  • Adjustable current limit (0.5A to 1.5A) via external resistor
  • Auto-retry fault response (no latch-off)
  • Open-drain overcurrent fault flag

Applications

  • USB port power switching
  • Hot-plug power control
  • Peripheral power management
  • Short-circuit protected power rails

The TPS2065CDBVR from Texas Instruments is a single-channel current-limited power distribution switch in a compact SOT-23-5 package. The device integrates a 50mOhm N-channel MOSFET power switch with an adjustable current limit (0.5A to 1.5A), making it suitable for USB port power switching, hot-plug applications, and general-purpose power rail protection. The 50mOhm on-resistance is exceptionally low for a SOT-23-5 packaged device, resulting in only 50mV voltage drop at 1A load current, which is critical for maintaining USB voltage compliance (4.75V minimum at the connector from a 5V supply). The adjustable current limit is set by a single external resistor from the ILIM pin to GND, allowing the designer to customize the current limit for different load requirements without changing the IC. The auto-retry fault response means that after a fault (overcurrent or thermal shutdown), the switch automatically attempts to restart after a cooldown period, rather than latching off and requiring a manual reset or power cycle. This is ideal for applications with capacitive loads (like USB devices) that may draw high inrush current during hot-plug. The open-drain OC (OverCurrent) flag provides a fault signal to the host MCU, while the auto-retry ensures the switch eventually turns on once the fault clears. The 2.7V to 5.5V input voltage range covers both 3.3V and 5V systems.

The TPS2065CDBVR operates as a current-limited high-side power switch with auto-retry. Key subsystems include: (1) N-Channel MOSFET Switch – a low-RDS(on) N-channel MOSFET with an internal charge pump generating a gate voltage above VIN to fully enhance the switch; the 50mOhm RDS(on) provides low voltage drop at full load; (2) Current Limit – the current is sensed across the MOSFET; when the current exceeds the programmed limit (set by the external resistor on ILIM), the gate drive is reduced to limit the current; the current limit accuracy is +/-20% over temperature; the auto-retry mode means the switch continues to limit current and retry periodically rather than latching off; (3) Auto-Rtry Logic – when a fault condition (overcurrent or thermal shutdown) is detected, the switch turns off for a retry period (typically 50ms), then turns on again; if the fault persists, the cycle repeats indefinitely; the duty cycle during retry is approximately 0.5% (50ms off, 250us on), limiting average power dissipation during a sustained fault; (4) Thermal Shutdown – when the junction temperature exceeds approximately 140C, the switch is turned off to prevent damage; the switch automatically restarts when the temperature drops below the hysteresis threshold; (5) OC Flag – the open-drain OC pin is asserted low during any fault condition (overcurrent, thermal shutdown, or UVLO); the open-drain configuration allows multiple TPS2065C devices to share a common fault line with a single pull-up resistor.

Pin Name Function
1 OUT Switch output (to load)
2 GND Ground
3 OC Overcurrent flag (active low, open-drain)
4 EN Enable input (active high)
5 IN Input supply (2.7V to 5.5V)
  • USB port: 50mOhm RDS(on) maintains 4.9V at USB connector at 500mA, adjustable current limit matches USB 2.0 spec (500mA) or USB 3.0 (900mA)
  • Hot-plug module: auto-retry handles inrush from module input capacitor without latching off, OC flag alerts host to retry status
  • Multiple power rails: two TPS2065C with different ILIM resistors for 500mA and 1A rails, shared OC flag with wired-OR
Manufacturer Part Number Package Notes
TI TPS2065DBVR SOT-23-5 Latch-off version (fault latches until EN toggle)
TI TPS2062CDBVR SOT-23-5 500mA version, lower current limit
onsemi NCP380LSN05AAT1G TSOP-6 Similar function, 5V, adjustable ILIM
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