MAX8903NETI+T datasheet(6/30 Pages) MAXIM

6 / 30 page

MAX8903A–E/G/H/J/N/Y

2A 1-Cell Li+ DC-DC Chargers

for USB and Adapter Power

Maxim Integrated

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IVL = 0 to 1mA

(MAX8903A/C/D/H/J/N/Y)

4.6

5.0

5.4

VL Output Voltage

VDC = VUSB = 6V

IVL = 0 to 10mA

(MAX8903B/E/G)

4.6

5.0

5.4

VL UVLO Threshold

VVL falling; 200mV hysteresis

3.2

Thermal Shutdown Temperature

160

°C

Thermal Shutdown Hysteresis

°C

ELECTRICAL CHARACTERISTICS (continued)

(VDC = VUSB = 5V, VBAT = 4V, circuit of Figure 2, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

(Note 1)

Note 1: Limits are 100% production tested at TA = +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 its high-side switch operates as a

linear regulator with a 100mA current limit. The linear regulator’s output is connected to LX and its output current flows

through the inductor into CS and finally 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 VSYS = 400mV, and 50mA for VSYS between 400mV and 2V.

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

MAX8903A/B/C/D/E/H/J/N/Y

BATTERY CHARGER EFFICIENCY

vs. BATTERY VOLTAGE

BATTERY VOLTAGE (V)

4.5

4.0

3.0

3.5

2.0

2.5

1.5

100

1.0

5.0

VDC = 8V

IBAT = 0.15A

IBAT = 1.5A

VDC = 5V

VDC = 12V

MAX8903G BATTERY CHARGER

EFFICIENCY vs. BATTERY VOLTAGE

BATTERY VOLTAGE (V)

4.5

4.0

3.0

3.5

2.0

2.5

1.5

VDC = 12V

IBATT = 0.15A

IBATT = 1.5A

100

1.0

5.0

VDC = 6V

VDC = 9V

0.0

0.5

1.0

1.5

2.0

2.5

3.0

4.0

3.5

4.5

10121416

MAX8903A/B/C/D/E/H/J/N/Y

SWITCHING FREQUENCY vs. VDC

DC VOLTAGE (V)

VBAT = 3V

RISET = 1.2k

Ω

VCEN = 0V

VBAT = 4V

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