Datasheet
MCP73871
DS20002090C-page 6 2008-2013 Microchip Technology Inc.
Current Regulation (Fast Charge Constant Current Mode)
AC-Adapter
Fast Charge
Current
I
REG
90 100 110 mA PROG1 = 10 k
T
A
= -5°C to +55°C, SEL = Hi
900 1000 1100 mA PROG1 = 1 k
T
A
= -5°C to +55°C, SEL = Hi
USB Fast Charge
Current
I
REG
80 90 100 mA PROG2 = Low, SEL = Low,
(Note 2)
T
A
= -5°C to +55°C
400 450 500 mA PROG2 = High, SEL = Low,
(Note 2)
T
A
= -5°C to +55°C
Input Current Limit Control (ICLC)
USB-Port Supply
Current Limit
I
LIMIT_USB
80 90 100 mA PROG2 = Low, SEL = Low
T
A
= -5°C to +55°C
400 450 500 mA PROG2 = High, SEL = Low
T
A
= -5°C to +55°C
AC-DC Adapter Current
Limit
I
LIMIT_AC
1500 1650 1800 mA SEL = High, T
A
= -5°C to +55°C
Voltage Proportional Charge Control (VPCC - Input Voltage Regulation)
VPCC Input Threshold V
VPCC
— 1.23 — V I
OUT
= 10 mA
T
A
= -5°C to +55°C
VPCC Input Threshold
Tolerance
V
RTOL
-3 — +3 %
Input Leakage Current I
LK
— 0.01 1 μAV
VPCC
= V
DD
Precondition Current Regulation (Trickle Charge Constant Current Mode)
Precondition Current
Ratio
I
PREG
/I
REG
7.5 10 12.5 % PROG1 = 1.0 k to 10 k
T
A
= -5°C to +55°C
Precondition Current
Threshold Ratio
V
PTH
/V
REG
69 72 75 % V
BAT
Low-to-High
Precondition Hysteresis V
PHYS
— 105 — mV V
BAT
High-to-Low
Automatic Charge Termination Set Point
Charge Termination
Current Ratio
I
TERM
75 100 125 mA PROG3 = 10 k
T
A
= -5°C to +55°C
7.5 10 12.5 mA PROG3 = 100 k
T
A
= -5°C to +55°C
Automatic Recharge
Recharge Voltage
Threshold Ratio
V
RTH
V
REG
– 0.21V V
REG
– 0.15V V
REG
– 0.09V V V
BAT
High-to-Low
IN-to-OUT Pass Transistor ON-Resistance
ON-Resistance R
DS_ON
— 200 — m V
DD
= 4.5V, T
J
= 105°C
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, all limits apply for V
IN
= V
REG
+ 0.3V to 6V, T
A
= -40°C to +85°C.
Typical values are at +25°C, V
IN
= [V
REG
(typical) + 1.0V]
Parameters Sym Min Typ Max Units Conditions
Note 1: The value is ensured by design and not production tested.
2: The maximum available charge current is also limited by the value set at PROG1 input.