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© 2007 Semtech Corp.

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SC804

PRELIMINARY

POWER MANAGEMENT

Typical Charge Cycle

Evaluation Board configured for internal timer, 1.5V on IPRGM = 810mA, 1.5V on ITERM = 300mA, VCC = 5.0V, Li-Ion battery capacity =

1000mAh. A 70mA battery load was applied after initial charge timeout, and removed during the recharge cycle prior to termination.

(a) Constant Current (CC) Charging (Fast Charge); (b) Constant Voltage (CV) Charging; (c) Termination; (d) Float Charging; (e) Timer Expiration;

(f) Slow Battery Discharge; (g) Recharge; (h) Termination.

Time, hours

Typical Charge Cycle

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

(a)

(b

(c)

(d)

Battery Voltage

(f)

(h)

(g)

(e)

ITERM Voltage

IPRGM Voltage

CHRGB Voltage

ITERM Voltage

CHRGB Voltage