Rainbow-electronics MAX8903A Uživatelský manuál stáhnout pdf (Strana 5)

MAX8903A

2A 1-Cell Li+ DC-DC Charger for USB*

and Adapter Power

_______________________________________________________________________________________ 5

PARAMETER CONDITIONS MIN TYP MAX UNITS

Sinking 1mA 8 50

Logic Output Voltage, Low

(CHG, FLT, DOK, UOK)

Sinking 10mA 80

= +25°C 0.001 1

Open-Drain Output Leakage

C ur rent, Hi g h (CHG , FLT, DOK, UOK)

OUT

= 5.5V

= +85°C 0.01

µA

VL Output Voltage V

= V

USB

= 6V, I

= 0 to 1mA 4.6 5 5.4 V

VL UVLO Threshold V

falling; 200mV hysteresis 3.2 V

Thermal Shutdown Temperature 160 °C

Thermal Shutdown Hysteresis 15 °C

ELECTRICAL CHARACTERISTICS (continued)

= V

USB

= 5V, V

BAT

= 4V, circuit of Figure 2, T

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

(Note 1)

Note 1: Limits are 100% production tested at T

= +25°C. Limits over the operating temperature range are guaranteed by design.

Note 2: For the 100mA USB mode using the DC input, the step-down regulator is turned off and a low-dropout linear regulator is

connected from DC to SYS.

Note 3: For the 500mA USB mode, the actual current drawn from USB is less than the output current due to the input/output current

ratio of the DC-DC converter.

Note 4: For short-circuit protection, SYS sources 25mA below V

SYS

= 400mV, and 50mA for V

SYS

between 400mV and 2V.

Typical Operating Characteristics

= +25°C, unless otherwise noted.)

100

1.0 2.0 2.51.5 3.0 3.5 4.0 4.5 5.0

BATTERY CHARGER EFFICIENCY

vs. BATTERY VOLTAGE

MAX8903A toc01

BATTERY VOLTAGE (V)

EFFICIENCY (%)

= 12V

BATT

= 0.15A

= 8V

= 5V

BATT

= 1.5A

BATT

= 1.5A

0.0

0.5

1.0

1.5

2.0

2.5

3.0

4.0

3.5

4.5

486 10121416

SWITCHING FREQUENCY

vs. V

MAX8903A toc02

DC VOLTAGE (V)

SWITCHING FREQUENCY (MHz)

BAT

= 3V

ISET

= 1.2kΩ

CEN = 0V

BAT

= 4V

SYS EFFICIENCY vs. DC VOLTAGE

MAX8903A toc03

SYS OUTPUT CURRENT (mA)

SYS EFFICIENCY (%)

100010010

100

1 10,000

= 16V

= 11V

= 6V

= 4.5V

1 2 3 4 5 6 7 8 9 10 ... 19 20

MAX8903A 1

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