Rainbow-electronics MAX1821 Manual do Utilizador descarregar pdf (Página 4)

MAX1820/MAX1821

WCDMA Cellular Phone 600mA

Buck Regulators

4 _______________________________________________________________________________________

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS

Input BATT Voltage V

2.6 5.5 V

Undervoltage Lockout

Threshold

UVLO

BATT

rising, 1% hysteresis 2.15 2.55 V

SKIP = GND (MAX1820Z, MAX1821) 300

SKIP = GND (MAX1820X, MAX1820Y, and

MAX1821X)

360

Quiescent Current I

SKIP = BATT, no switching 2000

µA

SKIP = GND 1000

Quiescent Current in Dropout

SKIP = BATT, no switching 1000

µA

Shutdown Supply Current I

SHDN

SHDN = GND 6 µA

ERROR AMPLIFIER

REF

= 1.932 ±0.005V, load = 0 to 600mA,

SKIP = BATT or GND

3.33 3.47

OUT Voltage Accuracy

(MAX1820)

OUT

REF

= 0.227 ±0.005V, load = 0 to 30mA,

SKIP = BATT, V

BATT

≤ 4.2V

0.35 0.45

OUT Input Resistance

(MAX1820)

OUT

250 kΩ

REF Input Current (MAX1820) I

REF

1µA

FB Voltage Accuracy

(MAX1821)

FB = COMP 1.225 1.275 V

FB Input Current (MAX1821) I

= 1.4V 50 nA

Transconductance g

30 85 µS

COMP Clamp Low Voltage 0.2 1.0 V

COMP Clamp High Voltage 2.04 2.28 V

CONTROLLER

P-Channel On-Resistance P

RDS

= 180mA, V

BATT

= 3.6V 0.3 Ω

N-Channel On-Resistance N

RDS

= 180mA, V

BATT

= 3.6V 0.35 Ω

Current-Sense Transresistance R

0.25 0.75 V/A

P-Channel Current-Limit

Threshold

Duty factor = 100% 0.75 1.55 A

P-Channel Pulse-Skipping

Current Threshold

SKIP = GND 0.04 0.24 A

SKIP = BATT -1.6 -0.45

N-Channel Current-Limit

Threshold

SKIP = GND 0.01 0.14

ELECTRICAL CHARACTERISTICS

BATT

= 3.6V, SHDN = BATT, SKIP = SYNC = GND, V

REF

= 1.25V (MAX1820 only), T

= -40°C to +85°C, unless otherwise noted.)

(Notes 2, 3)

1 2 3 4 5 6 7 8 9 ... 17 18

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