BD8179MUV-E2 Ver la hoja de datos (PDF) - ROHM Semiconductor
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BD8179MUV-E2 Datasheet PDF : 13 Pages
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BD8179MUV
Technical Note
●Block Function
Step-up Controller
A controller circuit for DC/DC boosting.
The switching duty is controlled so that the feedback voltage FB is set to 1.233 V (typ.).
A soft start operates at the time of starting.
Gate-on Controller
A controller circuit for the positive-side charge pump.
The liner regulator controls so that the feedback voltage FBP will be set to 1.25 V (typ.).
Gate-off Controller
A controller circuit for the negative-side charge pump.
The liner regulator controls so that the feedback voltage FBN will be set to 0.25 V (Typ.).
Gate Shading Controller
A controller circuit for MOS FET Switch
The COM switching synchronize with CTL input.
Start-up Controller
A control circuit for the starting sequence.
Controls to start in order of VCC VMAIN VGOFF/VGONVCOM
REF
A block that generates internal reference voltage. 1.25V (Typ.) is output.
TSD/UVLO/OVP
Thermal shutdown/Under-voltage lockout protection/circuit blocks.
The thermal shutdown circuit is shut down at an IC internal temperature of 175°C and reactivate at 160°C.
The under-voltage lockout protection circuit shuts down the IC when the VIN is 2.4 V (typ.) or below.
The over-voltage lockout protection circuit shuts down the IC when the SUP is 19.0 V (typ.) or over.
OP1～OP5
Operational amplifier block
●Starting sequence
①②
③
④
2.4
VIN
VMAIN
VGON/VGOFF
3.25ms
VDEL
15ms
VGON
VGOFF
1.25V
VCOM
①UVLO released when VIN voltage reaches 2.4V
②Step up DCDC converter starts switching, and VGON and VGOFF starts.
③VDEL starts.
④VCOM ON when VDEL reaches 1.25V
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© 2009 ROHM Co., Ltd. All rights reserved.
6/12
2009.07 - Rev.B
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