Datasheet

© 2007-2011 Microchip Technology Inc. DS22071B-page 5
MCP73837/8
USB-port Fast Charge Current I
REG
80 90 100 mA PROG2 = Low
400 450 500 mA PROG2 = High
T
A
=-5°C to +55°C
Maximum Output Current Limit I
MAX
— 1200 — mA PROG1 < 833Ω
Precondition Current Regulation (Trickle Charge Constant-Current Mode)
Precondition Current Ratio I
PREG
/ I
REG
7.5 10 12.5 % Note 3
15 20 25 % T
A
=-5°C to +55°C
30 40 50 %
100 %
Precondition Current Threshold Ratio V
PTH
/ V
REG
64 66.5 69 % V
BAT
Low to High
69 71.5 74 %
Precondition Hysteresis V
PHYS
— 120 — mV V
BAT
High to Low
Charge Termination
Charge Termination Current Ratio I
TERM
/ I
REG
3.75 5 6.25 % PROG1 = 1 kΩ to 10 kΩ
5.6 7.5 9.4 % T
A
=-5°C to +55°C
7.5 10 12.5 % Note 3
15 20 25 %
Automatic Recharge
Recharge Voltage Threshold Ratio V
RTH
/ V
REG
92 94.0 96 % V
BAT
High to Low
95 97 99 % T
A
=-5°C to +55°C
Pass Transistor ON-Resistance
ON-Resistance R
DSON
— 350 — mΩ V
DD
= 4.5V, T
J
= 105°C
Battery Discharge Current
Output Reverse Leakage Current I
DISCHARGE
— 0.1 2 µA Standby (PROG1 or PROG2
Floating)
— 0.55 2 µA Shutdown (V
DD
< V
BAT
-
100 mV or V
DD
< V
STOP
)
— -6 -15 µA Charge Complete
Status Indicators - STAT1, STAT2, PG
(MCP73837)
Sink Current I
SINK
—1635mA
Low Output Voltage V
OL
—0.31VI
SINK
= 4 mA
Input Leakage Current I
LK
— 0.03 1 µA High Impedance, V
DD
on pin
PROG1 Input (PROG1)
Charge Impedance Range R
PROG
1——kΩ Note 4
Shutdown Impedance R
PROG
70 — 200 kΩ Minimum Impedance for
Shutdown
PROG2 Inputs (PROG2)
Input High Voltage Level V
IH
0.8V
DD
——%
Input Low Voltage Level V
IL
——0.2V
DD
%
Shutdown Voltage Level V
SD
0.2V
DD
—0.8V
DD
%
Input Leakage Current I
LK
—715µAV
PROG2
= V
DD
DC CHARACTERISTICS (Continued)
Electrical Specifications: Unless otherwise indicated, all limits apply for V
DD
= [V
REG
(typical) + 0.3V] to 6V,
T
A
= -40°C to +85°C. Typical values are at +25°C, V
DD
= [V
REG
(typical) + 1.0V]
Parameters Sym Min Typ Max Units Conditions
Note 1: The supply voltage (V
DD
) = V
AC
when input power source is from AC-adapter and the supply voltage (V
DD
) = V
USB
when input power source is from USB-port.
2: The value is guaranteed by design and not production tested.
3: The current is based on the ratio of selected current regulation (I
REG
).
4: The maximum charge impedance has to be less than shutdown impedance for normal operation.