ltc4058x-4.2 Linear Technology Corporation, ltc4058x-4.2 Datasheet - Page 5

• Manufacturer Part Number: ltc4058x-4.2
• Description: Ltc4058x-4.2 - Standalone Linear Li-ion Battery Chargers With Thermal Regulation In Dfn
• Manufacturer: Linear Technology Corporation

PI FU CTIO S
BSENSE (Pin 1): Battery Sense. This pin is used to Kelvin
sense the positive battery terminal and regulate the final
float voltage to 4.2V. An internal precision resistor divider
sets this float voltage and is disconnected in shutdown
mode. For Li-Ion applications, this pin must be electri-
cally connected to BAT.
BAT (Pin 2): Charge Current Output. Provides charge
current to the battery from the internal P-channel MOSFET.
CHRG (Pin 3): Charge Status Open-Drain Output. When
the battery is charging, the CHRG pin is pulled low by an
TYPICAL PERFOR A CE CHARACTERISTICS
600
500
100
400
300
200
U
0
4
Charge Current vs Supply Voltage
V
T
A
BAT
JA
= 25 C
= 40 C/W
4.5
= V
U
BSENSE
5
R
R
= 4V
800
700
600
500
400
300
200
100
PROG
PROG
V
0
CC
5.5
3.8
Power FET Transistor Curve
U
(V)
= 10k
= 2k
V
V
T
R
A
CC
BSENSE
PROG
= 25 C
= 5V
6
4.1
= 2k
= 3.5V
W
6.5
405842 G13
4.4
V
BAT
U
7
(V)
4.7
600
500
200
400
300
100
5
0
–50
405842 G16
Charge Current
vs Ambient Temperature
V
V
CC
BAT
JA
5.3
–25
= 40 C/W
ONSET OF THERMAL REGULATION
= 5V
= V
BSENSE
0
TEMPERATURE ( C)
R
R
PROG
PROG
= 4V
25
= 10k
internal N-channel MOSFET. When the charge cycle is
completed, CHRG becomes high impedance.
GND (Pins 4, 9): Ground/Exposed Pad. The exposed
backside of the package (Pin 9) is also ground and must
be soldered to the PC board for maximum heat transfer.
PROG (Pin 5): Charge Current Program and Charge Cur-
rent Monitor. Charge current is programmed by connect-
ing a 1% resistor, R
constant-current mode, this pin servos to 1V. In all modes,
= 2k
50
75
800
700
600
500
400
300
LTC4058-4.2/LTC4058X-4.2
–50
100
Power FET “ON” Resistance
vs Temperature
405842 G14
V
V
V
R
CC
BAT
BSENSE
PROG
= 5V
–25
125
= 4.8V
= 2k
= 4V
TEMPERATURE ( C)
0
PROG
4.16
4.14
4.06
4.04
4.12
4.10
4.08
25
–50
, to ground. When charging in
Recharge Threshold Voltage
vs Temperature
V
R
CC
PROG
50
= 5V
–25
= 10k
75
TEMPERATURE ( C)
405842 G17
0
100
25
50
sn405842 405842fs
75
405842 G15
5
100