BD2062FJ_14 Datasheet, PDF (15/26 Pages) Rohm – 2.4A Current Limit High Side Switch ICs

BD2062FJ BD2066FJ
Typical Application Circuit
VBUS
D+
D-
GND
IN OUT
Regulator
Data
1100kk~1to001k00k
1100kk~t1o0100k0k
ON/OFF
OC
OC
ON/OFF
USB Controller
5V(T(yTpy.p) )
Datasheet
GND
/OC1
IN
CIN
/EN1
(EN1)
/EN2
(EN2)
OUT1
OUT2
/OC2
BD2062FJ/66FJ
CL
Data
CL
Data
Application Information
When excessive current flows due to output short-circuit or so, ringing occurs because of inductance between power source
lines and IC. This may cause bad effects on IC operations. In order to avoid this case, connect a bypass capacitor across
IN terminal and GND terminal of IC. 1μF or higher is recommended.
Pull up /OC output by a resistance value of 10kΩ to 100kΩ.
Set up values of CL which satisfies the application.
This application circuit does not guarantee its operation.
When using the circuit with changes to the external circuit constants, make sure to leave an adequate margin for external
components including AC/DC characteristics as well as dispersion of the IC.
Functional Description
1. Switch Operation
IN terminal and OUT terminal are connected to the drain and the source of switch MOSFET respectively. The IN terminal
is also used as power source input to internal control circuit.
When the switch is turned on from EN/EN control input, IN terminal and OUT terminal are connected by a 80mΩ switch.
In on status, the switch is bidirectional. Therefore, when the potential of OUT terminal is higher than that of IN terminal,
current flows from OUT terminal to IN terminal.
Since a parasitic diode between the drain and the source of switch MOSFET is not present in the off status, it is possible
to prevent current from flowing reversely from OUT to IN.
2. Thermal Shutdown Circuit (TSD)
Thermal shut down circuit have a dual thermal shutdown threshold. Since thermal shutdown works at a lower junction
temperature when an over-current occurs, the switch turns off and outputs an error flag (/OC).
Thermal shut down action has hysteresis. When the junction temperature goes down the switch automatically turns on
and resets the error flag. Unless the cause of increase of the chip’s temperature is removed or the output of power switch
is turned off, this operation repeats. The thermal shut down circuit works when the switch of either OUT1 or OUT2 is on
(EN, /EN signal is active).
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111ï½¥15ï½¥001
15/22
TSZ02201-0E3E0H300160-1-2
21.Aug.2014 Rev.003