LP3910 Datasheet, PDF (31/72 Pages) Texas Instruments – Power Management IC for Hard-Drive-Based Portable Media Players

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Feature Description (continued)
External or
USB Power
LP3910
SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015
Iprog
Vref
+
CV
-
+
+
CC
+
-
Thermal
regulation
Current
Control
Batt
+
Iref
Li - Ion Cell
Vbatt Vref
+-
Vrestart
+-
Vfull
Charger
State
Machine and
registers
Batt_temp
I2C
Ts
+-
Ref 0.27V
+
-
Ref 2.87V
CV: Constant Voltage regulation
CC: Constant Current regulation
Figure 53. Charger Architecture
The charger module is a linear charger with constant current pre-qualification, CC full-rate charging and CV
charging. CC and CV regulation is performed using an internal Power FET Q2 with reverse current blocking. The
termination voltage is controlled to within ±0.35% at room temperature.
The power FET Q1 acts as a switch with programmable current limit for USB operation.
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