Preliminary Data Sheet
April 2003
PSC1534 Lithium-Ion Linear Battery Charger
Pin Information
TOP VIEW
I
SENSE
1
6 DRIVE
GND 2
5 BAT
V
CC
3
T
JMAX
= 125 ºC,
θ
JA
= 230 ºC/W
4 PROG
Figure 4. S6 Package, 6-Lead Plastic, 1 mm Thick, SOT-23
Table 1. Pin Descriptions
Pin Number
1
2
3
Signal Name
I
SENSE
GND
V
CC
Type
Output
GND
Supply
Description
Charging current sense node. Supplies a monitored and controlled
current from V
CC
to the PNP emitter.
Ground reference for all internal circuits. Kelvin connects battery
ground to GND to minimize battery top-off voltage error.
Positive input supply for all internal circuits and external charging
current (PNP emitter). The internal charging current control loop
monitors and controls the current flow between V
CC
and I
SENSE
.
Bypass this pin to GND with a 1
µF
to 10
µF
tantalum capacitor.
Charge current programming pin. Use an external resistor, R
PROG
,
to set current-mode charging current. I
CHRG
= 1.5 V/R
PROG
. If the
voltage on PROG exceeds 2.15 V, the PSC1534 enters manual
shutdown mode. This pin can be monitored by an external A/D con-
verter.
Battery voltage sense input. Bypass this pin with a 10
µF
tantalum
capacitor close to BAT and GND.
Output base driver for PNP transistor. This driver output is current
limited and monitored by an internal thermal shutdown circuit that
will disable the driver if high-current fault conditions occur.
4
PROG
I/O
5
6
BAT
DRIVE
I/O
Output
Agere Systems Inc.
3
AGERE [ AGERE SYSTEMS ]
