LTC4065EDC Linear Technology, LTC4065EDC Datasheet - Page 7

• Manufacturer Part Number: LTC4065EDC
• Manufacturer: Linear Technology

Specifications of LTC4065EDC

• Battery Type: Li-Ion
• Output Current: 500mA
• Output Voltage: 4.2V
• Operating Supply Voltage (min): 3.75V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: -40C to 85C
• Mounting: Surface Mount
• Pin Count: 6
• Operating Temperature Classification: Industrial
• Lead Free Status / Rohs Status: Not Compliant

PI FU CTIO S
GND (Pin 1): Ground.
CHRG (Pin 2): Open-Drain Charge Status Output. The
charge status indicator pin has three states: pull-down,
pulse at 2Hz and high impedance state. This output can be
used as a logic interface or as an LED driver. When the
battery is being charged, the CHRG pin is pulled low by an
internal N-channel MOSFET. When the charge current
drops to 10% of the full-scale current, the CHRG pin is
forced to a high impedance state. If the battery voltage
remains below 2.9V for one quarter of the charge time, the
battery is considered defective and the CHRG pin pulses at
a frequency of 2Hz.
BAT (Pin 3): Charge Current Output. Provides charge
current to the battery and regulates the final float voltage
to 4.2V. An internal precision resistor divider on this pin
sets the float voltage and is disconnected in shutdown mode.
V
provides power to the charger. V
to 5.5V. This pin should be bypassed with at least a 1µF
capacitor. When V
voltage, the LTC4065 enters shutdown mode, dropping
I
EN (Pin 5, LTC4065 Only): Enable Input Pin. Pulling this
pin above the manual shutdown threshold (V
cally 0.82V) puts the LTC4065 in shutdown mode. In
shutdown mode, the LTC4065 has less than 20µA supply
current and less than 1µA battery drain current. Enable is
the default state, but the pin should be tied to GND if unused.
BAT
CC
U
to about 1µA.
(Pin 4): Positive Input Supply Voltage. This pin
U
CC
U
is within 32mV of the BAT pin
CC
can range from 3.75V
MS
is typi-
ACPR (Pin 5, LTC4065A Only): Open-Drain Power Supply
Status Output. When V
lockout threshold (3.6V) and V
the ACPR pin will be pulled down to ground; otherwise the
pin is high impedance.
PROG (Pin 6): Charge Current Program and Charge Cur-
rent Monitor Pin. Connecting a 1% resistor, R
ground programs the charge current. When charging in
constant-current mode, this pin servos to 1V. In all modes,
the voltage on this pin can be used to measure the charge
current using the following formula:
Floating the PROG pin sets the charge current to zero
(LTC4065) or puts the part in shutdown mode (LTC4065A).
In shutdown mode, the LTC4065A has less than 20µA
supply current and about 1µA battery drain current.
Exposed Pad (Pin 7): Ground. The Exposed Pad must be
soldered to the PCB ground to provide both electrical con-
tact and rated thermal performance.
I
BAT
=
R
V
PROG
PROG
• 1000
LTC4065/LTC4065A
CC
is greater than the undervoltage
BAT
+ 80mV (if V
BAT
PROG
> 3.6V),
4065fb
7
, to