© 2007 Microchip Technology Inc.

DS22071A-page 5

MCP73837/8

USB-Port Fast Charge Current

80

90

100

mA

PROG2 = Low

400

450

500

mA

PROG2 = High

Maximum Output Current Limit

—

1200

—

mA

PROG1 < 833

Ω

Precondition Current Regulation (Trickle Charge Constant-Current Mode)

Precondition Current Ratio

7.5

10

12.5

%

Note 3

15

20

25

%

30

40

50

%

100

%

Precondition Current Threshold Ratio

64

66.5

69

%

69

71.5

74

%

Precondition Hysteresis

—

120

—

mV

Charge Termination

Charge Termination Current Ratio

3.75

5

6.25

%

PROG1 = 1 k

Ω to 10 kΩ

5.6

7.5

9.4

%

7.5

10

12.5

%

Note 3

15

20

25

%

Automatic Recharge

Recharge Voltage Threshold Ratio

92

94.0

96

%

95

97

99

%

Pass Transistor ON-Resistance

ON-Resistance

—

350

—

m

Ω

Battery Discharge Current

Output Reverse Leakage Current

—

0.1

2

µA

Standby (PROG1 or PROG2

Floating)

—

0.55

2

µA

—

-6

-15

µA

Charge Complete

Status Indicators - STAT1, STAT2, PG (MCP73837)

Sink Current

—16

35

mA

Low Output Voltage

—0.3

1

V

Input Leakage Current

—

0.03

1

µA

PROG1 Input (PROG1)

Charge Impedance Range

1—

—

k

Ω

Note 4

Shutdown Impedance

70

—

200

k

Ω

Minimum Impedance for

Shutdown

PROG2 Inputs (PROG2)

Input High Voltage Level

——

%

Input Low Voltage Level

—

—

%

Shutdown Voltage Level

%

Input Leakage Current

—7

15

µA

DC CHARACTERISTICS (Continued)

Parameters

Sym

Min

Typ

Max

Units

Conditions

Note 1:

when input power source is from USB-Port.

2:

The value is guaranteed by design and not production tested.

3:

4:

The maximum charge impedance has to be less than shutdown impedance for normal operation.