LP3913SQX-AC/NOPB National Semiconductor, LP3913SQX-AC/NOPB Datasheet - Page 25

• Manufacturer Part Number: LP3913SQX-AC/NOPB
• Description: IC PWR MANAGEMENT W/CHRGR 48-LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LP3913SQX-AC/NOPB

• Applications: Handheld/Mobile Devices
• Voltage - Supply: 2.5 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Other names: LP3913SQX-AC

LDO1,2
BUCK1,2
BUCK3
CHARGER
A/D Converter
NRST
I
Internal System Oscillator
Battery Monitor
Current consumption
2
C interface
Power-On-Reset
The LP3913 is equipped with an internal Power-On-Reset
(“POR”) circuit that will reset the logic when V
guarantees that the logic is properly initialized when V
above the minimum operating voltage of the Logic and the
internal oscillator that clocks the Sequential Logic in the Con-
trol section.
Thermal Shutdown and Thermal Alarm
An internal temperature sensor monitors the junction temper-
ature of the LP3913 and forcibly invokes standby mode in the
unusual case when the junction temperature of the silicon ex-
ceeds the normal operating level due to excessive loads on
all power regulators and the Li-ion charger and/or due to an
abnormally high ambient temperature. The thermal Shutdown
threshold is 160°C.
The thermal shutdown is preceded by a Thermal alarm that
generates an interrupt request if unmasked (see Interrupt Re-
quest generation). The temperature threshold for triggering
the alarm is 115°C.
NRST Pin
The NRST pin is an open-drain output and is active low during
Standby, Power Off and Charger Standby modes. The NRST
timing is determined by a factory programmable counter.
Power Off
Off
Off
Off
Off
Off
Low
Off
Off
Off
<1 µA
Standby
Off
Off
Off
Off
Off
Low
Off
Off
On
10 µA (typ)
DD
< V
Voltage Threshold Levels
POR
DD
Power State Table
. This
rises
Active
On
On
On
On if Charger / USB Present
On
High
On
On
On
See Electrical Characteristics
25
Control Registers
The LP3913 contains 14 user programmable registers that
configure the functionality of the individual modules inside the
IC. Registers are programmed through an I
have default values that are invoked during an internal reset.
Some of the default values can be tailored to the specific
needs of the system designer (see Application Notes).
Throughout this product specification, the register address is
noted in hexadecimal notation immediately following the reg-
ister name as illustrated below:
PON Register (00)h Power On Event Register
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 fac-
tory 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 thresh-
old when the battery voltage is transitioning out of the
V
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
D7–4
is 50 mV (Typ.) higher than the values listed in the
D3
30000104
Charger Standby
Off
Off
Off
On if Charger / USB Present
Off
Low
On
On
On
See Electrical Characteristics
D2
D1
2
C interface and
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