BD9673AEFJ Datasheet, PDF (5/23 Pages) Rohm – Flexible Step-down Switching Regulators with Built-in Power MOSFET

BD9673AEFJ
Datasheet
Over Current Detect Current
【CTL】
EN Pin Control voltage
ON
OFF
EN Pin input current
【SYNC】
SYNC Pin Control voltage
High
Low
SYNC Pin input current
Iocp
VENON
VENOFF
REN
VSYNCH
VSYNCL
REN
SYNC falling edge to LX rising edge delay
◎Not designed to withstand radiation.
tdelay
2
2
-0.3
2.7
2.0
-0.3
6
200
3.3
－
A
－
VCC
V
－
0.8
V
5.5
11
µA VEN=3V
－
5.5
V
－
0.8
V
12
24
µA VSYNC=3V
400
600
ns
●Operating Ratings(Ta=25℃)
Item
Symbol
Power Supply Voltage
VCC
Output Voltage
VOUT
(*2)Restricted by minimum on pulse typ. 200ns
Min
7
1.0^(*2)
Ratings
Unit
Typ
Max
－
42
V
－
VCC×0.7
V
●Detailed Description
◇Synchronizes to External Clock
The SYNC pin can be used to synchronize the regulator to an external system clock. To implement the synchronization
feature connect a square wave to SYNC pin. The square wave amplitude must transition lower than 0.8V and higher than
2.0V on the SYNC pin and have an on time greater than 100ns and an off time greater than 100ns. The synchronization
frequency range is 200 kHz to 500 kHz. The rising edge of the LX will be synchronized to the falling edge of SYNC pin
signal after SYNC input pulse 3 count. At the synchronization, the external clock is removed, the device transitions
self-running mode after 7 microseconds.
SYNC
SYNC_LATCH
Lx
Set the latch for
synchronization
400nsec
about
7µsec
Figure 4. Timing chart at Synchronization
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TSZ22111・15・001
5/20
TSZ02201-0Q1Q0AJ00190-1-2
28.JAN.2014 Rev.003