LM3658SDX/NOPB National Semiconductor, LM3658SDX/NOPB Datasheet - Page 9

• Manufacturer Part Number: LM3658SDX/NOPB
• Description: IC USB/AC LI-ION CHARGER 10-LLP
• Manufacturer: National Semiconductor
• Type: Battery Chargerr

Specifications of LM3658SDX/NOPB

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 4.35 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-WFDFN Exposed Pad
• Output Current: 25mA
• Output Voltage: 4.2V
• Operating Supply Voltage (min): 4.35V
• Operating Supply Voltage (max): 6V
• Operating Temp Range: -40C to 85C
• Package Type: LLP EP
• Mounting: Surface Mount
• Pin Count: 10
• Operating Temperature Classification: Industrial
• For Use With: LM3658SDEV - BOARD EVALUATION LM3658SD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM3658SDX

OFF
ON
OFF
ON
SAFETY TIMERS
In order to prevent endless charging of the battery, which can
cause damage to the battery, there are three safety timers
that forcefully terminate charging if the charging mode is not
completed within the time allowed.
Pre-Qualification Timer (T
The pre-qualification timer starts with the initiation of the pre-
qualification mode and allows 30 minutes to transition from
pre-qualification to full rate charging. If the battery voltage
does not reach V
status pins STAT1 and STAT2 both turn on to indicate a bad
battery status.
Charger Timer (T
The charge timer starts with the initiation of full-rate charging
and has a duration of 5 hours for the LM3658. If the charge
current does not reach EOC, charging stops and STAT1 and
STAT2 both turn on to indicate a bad battery status. Once the
charge control declares a bad battery, removing the input
source is the only means to clear the bad battery status.
Top-Off Timer (T
Once the charger successfully completes constant current
constant voltage charging, it enters top-off mode and starts
T
top-off, charging stops when T
when I
is no time-out condition in top-off mode.
When charging is interrupted either by battery temperature
out of range or disabling the LM3658, the applicable safety
timer will store its count value for the duration of the interrup-
tion and subsequently resumes counting from its stored count
value when charging continues, only if the charger resumes
to the same operation mode it was in before the interrupt.
The LM3658SD-A version has selectable timers for T
T
timers can be chosen as follow:
Input
CHG_IN Low
CHG_IN High
USBpwr Low
USBpwr High
TOPOFF
TOPOFF
STAT1
CHG
. Based on the logic level applied to the USB_sel pin,
timer. Topoff lasts 30 minutes for the LM3658. During
reaches 2.5% of the full-rate charge current. There
USB_SEL T
OFF
OFF
ON
ON
TABLE 1. Status Pins Summary
STAT2
FULL_RATE
TOPOFF
CHG
)
Power-Down, charging is suspended
or interrupted
Pre-qualification mode, CC and CV
charging, Top-off mode
Charge is completed
Bad battery (Safety timer expired), or
LDO mode
30 minutes 10 hours 60 minutes
30 minutes 5 hours
30 minutes 10 hours 60 minutes
30 minutes 5 hours
)
PREQUAL
in 30 minutes, charging stops and
PREQUAL
TOPOFF
)
Condition
T
CHG
reaches its count or
T
30 minutes
30 minutes
TOPOFF
CHG
and
9
BATTERY TEMPERATURE MONITORING (SUSPEND
MODE)
The LM3658 is equipped with a battery thermistor interface to
continuously monitor the battery temperature by measuring
the voltage between the T
lowed only if the battery temperature is within the acceptable
temperature range set by a pair of internal comparators inside
the LM3658. If the battery temperature is out of range, STAT1
and STAT2 both turn off and charging is suspended. Timer
holds its count value.
The TS pin is only active during charging and draws no current
from the battery when no external power source is present.
If the TS pin is not used in the application, it should be con-
nected to GND through 10kΩ pulldown resistor.
When the TS pin is left floating (battery removal), then the
charger will be disabled as the TS voltage exceeds the upper
temperature limit.
The LM3658 battery temperature feature is tailored to use
negative temperature coefficient (NTC) 103AT thermistors
with 10kΩ impedance. If alternative thermistors need to be
used in the system, supplemental external resistors are need-
ed to create a circuit with equivalent impedance.
DISABLING CHARGER (CHARGE INTERRUPT MODE)
Charging can be safely interrupted by pulling the EN_b pin
high and charging can resume upon pulling the EN_b pin low.
The enable pin can be permanently tied to GND with no extra
current consumption penalty during power down mode. When
the charger is disabled, timer holds its count value, and
STAT1 and STAT2 are both off.
S
pin and ground. Charging is al-
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