BD9E301EFJ-LB Datasheet, PDF (22/33 Pages) Rohm – 7.0V to 36V Input, 2.5A Integrated MOSFET Single Synchronous Buck DC/DC Converter

BD9E301EFJ-LB
2. Output Voltage Set Point
The output voltage value can be set by the feedback resistance ratio.
VOUT
R1
R2
－
FB
ERR
＋
1.0V
V_OUT
=
R₁ + R₂
R₂
× 1.0
[V]
※ Minimum pulse range that can be produced at the output
stably through all the load area is 150nsec for
BD9E301EFJ-LB.
Use input/output condition which satisfies the following
method.
Figure 47. Feedback Resistor Circuit
150(nsec) ≤ ^VOUT
V _IN × F_OSC
3. Input voltage start-up
V_IN
UVLO
release
（6.6Vtyp.)
V_IN ≧
V_OUT×0.85
0.7
V_OUT
V_OUT×0.85
TSS
Figure 48. Input Voltage Start-up Time
Soft-start function is designed for the IC so that the output voltage will start according to the time it was decided internally.
After UVLO release, the output voltage range will be less than 70% of the input voltage at soft-start operation. Please be
sure that the input voltage of the soft-start after startup is as follows.
V_IN
≥^{VOUT × 0.85}
0.7
[V]
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21.Feb.2014 Rev.002