LP3913 Datasheet, PDF (27/70 Pages) Texas Instruments – Power Management IC for Flash Memory-Based Portable Media Players

LP3913
www.ti.com
SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013
Throughout this product specification, the register address is noted in hexadecimal notation immediately following
the register name as illustrated below:
PON Register (00)h Power On Event Register
D7–4
D3
D2
D1
D0
Battery Monitor
The battery voltage is monitored and will invoke the Power Off mode when the battery low threshold is breached
for more than 5 ms (Typ.). The battery low threshold DEFAULT is factory programmed. The battery low threshold
range is 2.5V–3.5V with steps of 50 mV. The Battery low threshold in the table below refers to a decreasing
battery voltage. The threshold when the battery voltage is transitioning out of the V_BATTLOW is 50 mV (Typ.) higher
than the values listed in the table below due to a built-in hysteresis of 50 mV (Typ.).
The battery low IRQ is triggered 200 mV above the battery low alarm threshold that powers down the IC. This
gives the user time for a controlled shutdown.
BATTLOW Register (04)h Battery Low Alarm Register
Access
Data
Reset
D7–5
Read Only 0
reserved
n/a
D4–0
rw
Battery Low Threshold Voltage (V)
5’h14–1F
2.50
5’h13
2.55
5’h12
2.60
5’h11
2.65
5’h10
2.70
5’h0F
2.75
5’h0E
2.80
5’h0D
2.85
5’h0C
2.90
5’h0B
2.95
5’h0A
3.00
5’h09
3.05
5’h08
3.10
5’h07
3.15
5’h06
3.20
5’h05
3.25
5’h04
3.30
5’h03
3.35
5’h02
3.40
5’h01
3.45
5’h00
3.50
5’h0C
2.90
Battery Low IRQ Threshold Voltage (V)
2.70
2.75
2.80
2.85
2.90
2.95
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
3.55
3.60
3.65
3.70
3.10
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 LP3913 is in
Power Off mode when the battery voltage is below the battery V_UVLO (2.4V typ) except when a valid external
supply is detected.
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