LTC4100EGPBF LINER [Linear Technology], LTC4100EGPBF Datasheet - Page 8

• Manufacturer Part Number: LTC4100EGPBF
• Description: Smart Battery Charger Controller
• Manufacturer: LINER [Linear Technology]

LTC4100
PIN FUNCTIONS
I
pin and GND. The value of the external resistor programs
the range and resolution of the programmed charger cur-
rent. This is a digital, not an analog, function.
V
this pin and GND. The value of the external resistor pro-
grams the range and resolution of the charging voltage.
This is a digital, not an analog, function.
THB (Pin 15): SafetySignal Force/Sense Pin to Smart
Battery. See description of operation for more detail. The
maximum allowed combined capacitance on THA, THB and
SafetySignal is 1nF (see Figure 4). A series resistor 54.9k
needs to be connected between this pin and the battery’s
SafetySignal for this circuit to work correctly.
THA (Pin 16): SafetySignal Force/Sense Pin to Smart
Battery. See description of operation for more detail. The
maximum allowed combined capacitance on THA, THB
and SafetySignal is 1nF (see Figure 4). A series resistor
1130Ω needs to be connected between this pin and the
battery’s SafetySignal for this circuit to work correctly.
V
Circuitry. Bypass this pin with 0.1μF . Typically between
3.3V and 5V
V
Divider, which Provides Battery Voltage Feedback to the
Charger.
8
LIM
LIM
DD
SET
(Pin 13): An external resistor is connected between this
(Pin 17): Power Supply Input for the LTC4100 Digital
(Pin 14): An external resistor is connected between
(Pin 18): Tap Point of the Programmable Resistor
DC
.
I
Mode PWM. Higher I
current in normal operation. A 0.0015μF capacitor to GND
fi lters out PWM ripple. Typical full-scale output current is
40μA. Nominal voltage range for this pin is 0V to 3V.
I
CSP (Pin 21): Current Amplifi er CA1 Input. This pin
and the BAT pin measure the voltage across the sense
resistor, R
signals required for both peak and average current mode
operation.
BAT (Pin 22): Battery Sense Input and the Negative Refer-
ence for the Current Sense Resistor. A bypass capacitor
of at least 10μF is required.
CLN (Pin 23): Negative Input to the Input Current Limiting
Circuit Block. If no current limit function is desired, connect
this pin to CLP . The threshold is set at 100mV below the
voltage at the CLP pin. When used to limit supply current,
a fi lter is needed to fi lter out the switching noise.
CLP (Pin 24): Positive Input to the Input Current Limiting
Circuit Block. This pin also serves as a power supply for
the IC.
TH
DC
(Pin 19): Control Signal of the Inner Loop of the Current
(Pin 20): Bypass to GND with a 0.068μF Capacitor.
SENSE
, to provide the instantaneous current
TH
corresponds to higher charging
4100fb