LTC4015_15 Datasheet, PDF (14/76 Pages) Linear Technology – Multichemistry Buck Battery Charger Controller with Digital Telemetry System

LTC4015
Pin Functions
CSN (Pin 19): Connection Point for the Negative Terminal
of the Charge Current Sense Resistor.
CSP (Pin 20): Connection Point for the Positive Terminal
of the Charge Current Sense Resistor.
MPPT (Pin 21): MPPT Enable Pin. Apply a logic signal
between 1.5V and INTV_CC (5V) to this pin to allow the 4015
to enter MPPT mode. MPPT mode can also be entered via
the I²C port. GND this pin if unused, do not float.
2P5V_CC (Pin 22): Bypass Pin for the Internal 2.5V Regu-
lator. This regulator provides power to the internal logic
circuitry. Bypass 2P5V_CC with a 2.2μF multilayer ceramic
capacitor to GND.
SW (Pin 23): Switch Node. SW pin swings from a diode
drop below ground up to V_SYS.
TG (Pin 24): Top Gate Drive. Drives the top N-channel
MOSFET with a voltage swing equal to DRV_CC superim-
posed on the switch node voltage V_SW.
BOOST (Pin 25): Boosted Floating Top Gate Drive Supply.
The BOOST pin swings from a diode voltage below DRV_CC
up to V_SYS + DRV_CC.
BG (Pin 26): Bottom Gate Drive. Drives the bottom
N-channel MOSFET between DRV_CC and ground.
DRV_CC (Pin 27): External Supply for Gate Driver. Do not
exceed 5.5V on this pin. If DRV_CC is not connected to
INTV_CC, INTV_CC must be greater than 3V before DRV_CC
is applied. If not connected to INTV_CC bypass this pin to
ground with a low ESR ceramic capacitor.
INTV_CC (Pin 28): Internal 5V Regulator Output. The control
circuits and optionally the gate drivers are powered from
this pin. Bypass this pin to ground with a minimum 4.7µF
low ESR tantalum or ceramic capacitor.
OUTFET (Pin 29): Output Ideal Diode Gate Control Pin for
External P-channel MOSFET.
SYSM5 (Pin 30): Internal Supply Pin. The V_SYSM5 pin
regulates at the higher of ground or approximately
V_SYS – 5V. A low impedance multilayer ceramic capacitor
should be connected from V_SYS to V_SYSM5.
SYS (Pin 31): System Input Voltage. Primary power input
to the 4015. This pin powers the internal INTV_CC LDO. SYS
is the max of V_BAT or V_IN. V_SYS should be bypassed with
a low impedance multilayer ceramic capacitor, along with
large bulk capacitors.
CLN (Pin 32): Connection Point for the Negative Terminal
of the Input Current Sense Resistor.
CLP (Pin 33): Connection Point for the Positive Terminal
of the Input Current Sense Resistor.
INFET (Pin 34): Input Ideal Diode Gate Control Pin for
External N-channel MOSFET.
V_IN (Pin 35): Supply Voltage for the PowerPath Step-down
Switching Charger. V_IN may be connected to any suitable
DC power source from 2.8V to 35V such that the voltage at
V_SYS is high enough to allow INTV_CC to support the desired
mode of operation. In order for the telemetry system to
operate INTV_CC must exceed the telemetry undervoltage
lockout. V_IN should be bypassed with a low impedance
multilayer ceramic capacitor.
CHEM0 (Pins 36, 2): Chemistry Select Pin. Three-state
pin used in combination with CHEM1 to set the battery
chemistry and charge algorithm.
CHEM1 (Pin 37): Chemistry Select Pin. Three-state pin used
in combination with CHEM0 to set the battery chemistry
and charge algorithm.
CELLS0 (Pin 38): Number of Cells Select Pin. Three-state
pin used in combination with CELLS1 and CELLS2 to set
the total number of battery cells.
4015f
14
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