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LP3910 датащи(PDF) 45 Page - Texas Instruments

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номер детали LP3910
подробное описание детали  Power Management IC for Hard-Drive-Based Portable Media Players
PDF  72 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

LP3910 датащи(HTML) 45 Page - Texas Instruments

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PowerOff
VBLA
Vuvlo
Vpor
2.1V
0.9V
2.4V (Typ.)
2.4-3.5V (factory
programmable)
4.2V (Typ.)
Vterm
Active
Standby
Battery safety switch on/off threshold
LP3910
www.ti.com
SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015
Device Functional Modes (continued)
Figure 65. Voltage Threshold Levels
Table 8. Power State Table
POWER OFF
STANDBY
ACTIVE
CHARGER STANDBY
LDO1,2
Off
Off
On
Off
Buck1,2
Off
Off
On
Off
Buck-Boost
Off
Off
On
Off
Charger
Off
Off
On if Charger / USB
On if Charger / USB
Present
Present
ADC
Off
Off
On
Off
NRST
Low
Low
High
Low
I2C interface
Off
Off
On
On
Internal system oscillator
Off
Off
On
On
Battery monitor
Off
On
On
On
Current consumption
<1 µA
10 µA (typical)
See Specifications
See Specifications
8.4.1.1 Power-Off Mode
In power-off mode the main battery, the battery charger supply, and the USB supply are below their minimum on
levels. All internal circuits are disabled as the supply voltage is below the level to activate them. The LP3910 is in
power-off mode when the battery voltage is below the battery VUVLO (2.4 V, typical) except when a valid external
supply is detected.
8.4.1.2 Standby Mode
When the LP3910 is in standby mode, the chip is waiting for a valid power-on event to transition to active mode.
There are 3 valid wake-up signals. First is the ONOFF pin. Second is wall adapter insertion. Third is the USB
insertion. VBATT must be greater than the battery VUVLO in order to stay in standby mode; otherwise, the chip
transitions to power-off mode. Standby mode is skipped when advancing from power-off mode when a battery is
inserted that is above the battery low alarm threshold.
If the battery is below the battery low alarm threshold, power-off mode transitions to standby mode. However, hot
insertion of the battery with the adapter connected is NOT permitted. In standby mode, the current consumption
is reduced to IQ (10 µA, typical).
8.4.1.3 Active Mode
All LP3910 circuits are fully operational in active mode.
Copyright © 2006–2015, Texas Instruments Incorporated
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Product Folder Links: LP3910



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