TC3827 Datasheet, PDF (1/10 Pages) Microchip Technology – Lithium-Ion Battery Charger

TC3827
Lithium-Ion Battery Charger
FEATURES
s Low Power Dissipation
s Shutdown Current: 1µA (Typical)
s Space-Saving 8-Pin MSOP Package
s No Inductor Required
s 1% Overall System Accuracy
s Charge Current Monitor Output
s Charge Status Indicator Output
s Foldback Current Limiting
s –20°C to +85°C Ambient Operating
Temperature Range
TYPICAL APPLICATIONS
s PDAs
s Cradle Chargers
s Li-Ion Battery Chargers
s Desktop Computers
s Hand-Held Instruments
s Cellular Telephones
s Battery Operated Devices
s Self-Charging Battery Packs
PIN CONFIGURATION
8-Pin MSOP
SHDN 1
GND 2
MODE 3
I_MON 4
TC3827
8 V_IN
7 _VSNS
6 V_DRV
5 _VOUT
TYPICAL APPLICATION CIRCUIT
+5 V_IN
LED
MODE
IMON
SHDN
Controller
RSENSE
NDP6020P
PMOS
10µF
V_IN ^VSNS
V_DRV
V_OUT
MODE ^TC3827
IMON
SHDN
GND
GENERAL DESCRIPTION
The TC3827 is a battery charger controller for a single
cell Li-Ion battery. Using an external PMOS transistor, safe
and fast charging of a single Li-Ion cell is accomplished.
Features include over-current foldback, charge current
monitor, and charge status LED indicator output. An overall
system accuracy of 1% ensures that the cell capacity is fully
utilized without cycle life degradation. An external resistor
sets charge current.
The TC3827 operates with an input voltage range from
4.5V to 5.5V. It is specified over the ambient operating
temperature range of –20°C to +85°C and is available in a
space-saving 8-Pin MSOP.
ORDERING INFORMATION
Part No.
TC3827-4.1VUA
TC3827-4.2VUA
Package
8-Pin MSOP
8-Pin MSOP
Temperature
Range
–20°C to +85°C
–20°C to +85°C
FUNCTIONAL BLOCK DIAGRAM
V_IN
+
C/A
V_SNS
–
GND
V_OUT
V_REF
+
E/A
–
+
E/A
–
SHDN
+
22µF
Li-Ion ^–
K
I_MON
CONTROL
BLOCK
VDRV
MODE
TC3827
Figure 1. TC3827 Typical Application Circuit
© 2001 Microchip Technology Inc. DS21558A
TC3827-2 12/12/00