ROHM BD2051AFJ BD2041AFJ BD6519FJ Data Sheet
Summary
This single-channel high side switch IC is optimized for reliable power management in USB applications, efficiently controlling power over a 2.7V to 5.5V range. The device features built-in safety mechanisms including Over Current Protection (OCP), Thermal Shutdown (TSD), and Under Voltage Lockout (UVLO). This comprehensive manual provides engineers with critical data on specifications, operational curves, and pin configurations required for designing durable power systems. It is ideal for use in consumer electronics such as USB hubs, PC peripherals, and car accessories that demand low-resistance switching performance.
Page 1 Text Content
Datasheet
1 Channel High Side Switch ICs
1.0A Current Limit High Side Switch ICs BD2041AFJ BD2051AFJ ●General Description ●Key Specifications Single channel high side switch IC for USB port is a Input voltage range: 2.7V to 5.5V high side switch having over current protection used in Continuous current load: 0.5A(Typ.) power supply line of universal serial bus (USB). ON resistance : 80mΩ(Typ.) N-channel power MOSFET of low on resistance and Over current threshold: 0.7A min., 1.6A max. low supply current are realized in this IC. Standby current: 0.01μA (Typ.) And, over current detection circuit, thermal shutdown Operating temperature range: -40℃ to +85℃ circuit, under voltage lockout and soft start circuit are built in. ●Package W(Typ.) D(Typ.) H (Max.)
SOP-J8 4.90mm x 6.00mm x 1.65mm
●Features Built-in low on resistance Nch MOS FET Switch.( Typ = 80mΩ) Continuous current load 0.5A Control input logic
Active-Low : BD2041AFJ Active-High: BD2051AFJ Soft start circuit Over current detection Thermal shutdown Under voltage lockout
Open drain error flag output SOP-J8
Reverse-current protection when power switch off
●Applications USB hub in consumer appliances, Car accessory, PC, PC peripheral equipment, and so forth
●Typical Application Circuit
5V(typ.)
GND VBUS OUT
OUT IN D+
IN OUT D-
EN(/EN) /OC GND
●Lineup
Over current detection
Control input logic Package Orderable Part Number Min. Typ. Max.
0.7A 1.0A 1.6A Low SOP-J8 Reel of 2500 BD2041AFJ-E2 0.7A 1.0A 1.6A High SOP-J8 Reel of 2500 BD2051AFJ-E2
○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ02201-0E3E0H300290-1-2
TSZ22111・14・001 08.Mar.2013 Rev.001
Page Summary Contents For ROHM BD2051AFJ BD2041AFJ BD6519FJ Data Sheet
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 25 |
| File Size | 676.21 KB |
| Published | June 15, 2026 |
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Frequently Asked Questions
What is the operational voltage range for this high side switch IC?
The recommended operating voltage (VIN) is between 2.7V and 5.5V.
Which model uses Active-Low logic for control input?
The BD2041AFJ requires an Active-Low signal to activate the power switch.
What protective features are included in the circuit design?
It is built with over current detection, thermal shutdown, under voltage lockout (UVLO), and a soft start circuit.