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PIFE32251B-R68MS 데이터시트(PDF) 56 Page - Texas Instruments

부품명 PIFE32251B-R68MS
상세설명  Simple and Flexible Wide Input Voltage PMU for Mobile Computers
PDF  157 Pages
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI1 - Texas Instruments

PIFE32251B-R68MS 데이터시트(HTML) 56 Page - Texas Instruments

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VDC
VIN
LDO5V
VLDO5
LDO5V
V5ADS3
PG_V5ADS3
EN5VSW
VDC
VREGVR2
VREGVR4
VIN5VSW
VREGVR1
Copyright © 2016, Texas Instruments Incorporated
VDC
AGND
EC
VIN
EN3V3SW
LDO3V
VOUT3V3SW
VOUT3V3SW
VLDO3
LDO3V
N
AGND
AGND
Copyright © 2016, Texas Instruments Incorporated
56
TPS650830
SLVSCF4A – DECEMBER 2014 – REVISED JULY 2016
www.ti.com
Submit Documentation Feedback
Product Folder Links: TPS650830
Detailed Description
Copyright © 2014–2016, Texas Instruments Incorporated
Figure 6-4. LDO3V and 3V3SW Load Switch
6.3.5
5-V LDO and 5VSW Load Switch
The LDO5V powers up when Vin pin goes above the UVLO5V threshold. The LDO5V powers the gate
drives for all the five VRs of the PMIC. The 5-V load switch is used to switch the gate drive source from
the internal LDO5V LDO to the 3.3-V PWM VR output as soon as the 3.3-V VR powergood signal
indicates it is good. This significantly improves the efficiency of the VRs whose effect is more significant at
lower VR load current, and VR input voltage. The load switch is enabled by the EN5VSW pin. Connect the
V5A_PG signal to the EN5VSW pin. When the EN5VSW pin is high, the LDO5V internal reference drops
to 4.5 V to ensure the 5-V VR drives all the gate drive current, but also ensures the gate drive never falls
below 4.5 V. When EN5VSW is low, the LDO resumes to 5-V internal reference and the load switch is
turned off to disconnect the 5-V VR.
Figure 6-5. 5-V LDO and 5VSW Load Switch



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