LTC4058X-4.2_15 Datasheet, PDF (6/12 Pages) Linear Technology – Standalone Linear Li-Ion Battery Charger with Thermal Regulation in DFN

LTC4058-4.2/LTC4058X-4.2
PI FU CTIO S
the voltage on this pin can be used to measure the charge
current using the following formula:
I_BAT = (V_PROG/R_PROG) • 1000
This pin is clamped to approximately 2.4V. Driving this pin
to voltages beyond the clamp voltage can draw currents as
high as 1.5mA.
V_CC (Pin 6): Positive Input Supply Voltage. Provides
power to the charger. V_CC can range from 4.25V to 6.5V.
This pin should be bypassed with at least a 1µF capacitor.
When V_CC is within 100mV of the BSENSE pin voltage, the
LTC4058 enters shutdown mode dropping the battery
drain current to less than 2µA.
ACPR (Pin 7): Power Supply Status Open-Drain Output.
When V_CC is greater than the undervoltage lockout thresh-
old and at least 100mV above V_BSENSE, the ACPR pin is
pulled to ground; otherwise, the pin is high impedance.
EN (Pin 8): Enable Input . A logic high on the EN pin will put
the LTC4058 into shutdown mode where the battery drain
current is reduced to less than 2µA and the supply current
is reduced to less than 50µA. A logic low or floating the EN
pin (allowing an internal 2MΩ pull-down resistor to pull
this pin low) enables charging.
BLOCK DIAGRA
120°C
T_DIE
ACPR
7
CHRG
3
CHARGE ACPR
LOGIC
TERM
EN
8
EN SHDN
R_EN
6
6
V_CC
T_A
1×
MA
5µA
CA
C1
VA
REF
1.21V
R3
1V
R4
0.1V
R5
1000×
BAT
2
BSENSE
1
R1
R2
TRICKLE CHARGE
DISABLED ON THE
C2
LTC4058X
2.9V TO BAT
PROG
5
R_PROG
GND
4, 9
405842 BD
sn405842 405842fs