Rainbow-electronics MAX8508 Manual de usuario descargar pdf (Pagina 3)

MAX8506/MAX8507/MAX8508

PWM Step-Down DC-DC Converters with 75m

Ω

Bypass FET for WCDMA and cdmaOne Handsets

_______________________________________________________________________________________ 3

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

P-Channel Current-Limit

Threshold

1.00 1.25 1.50

SKIP = BATT (PWM mode)

-0.6 -0.45 -0.30

N-Channel Current-Limit

Threshold

SKIP = GND (normal mode)

0.03 0.05 0.07

P-Channel Pulse-Skipping

Current Threshold

SKIP = GND (normal mode)

0.050 0.125 0.170

HP/Bypass P-Channel

Current-Limit Threshold

OUT

= 3.1V 0.8 1.5 2.5 A

LX Leakage Current -2

0.01

+2 µA

OUT Leakage Current -2

0.01

+2 µA

Maximum Duty Cycle

100

SKIP = GND (normal mode) 0

Minimum Duty Cycle

SKIP = BATT 12

COMP Clamp Low Voltage 0.8 V

COMP Clamp High Voltage 2.0 V

MAX8506 85

150 215

MAX8507 75

130 188

Transconductance

MAX8508

150 260 376

µS

Current-Sense Transresistance

0.36 0.48 0.60

V/A

OSCILLATOR

Internal Oscillator Frequency 0.8 1 1.2

MHz

LOGIC INPUTS (SHDN, HP, SKIP)

Logic-Input High Voltage V

BATT

= 2.6V to 5.5V 1.6 V

Logic-Input Low Voltage V

BATT

= 2.6V to 5.5V 0.4 V

Logic Input Current 0.1 1 µA

THERMAL SHUTDOWN

Thermal-Shutdown Temperature

+160

°C

Thermal-Shutdown Hysteresis 15 °C

ELECTRICAL CHARACTERISTICS (continued)

BATT

= V

BATTP

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

REFIN

= 1.932V (MAX8506), V

REFIN

= 1.70V (MAX8507),

REF

= 0.22µF, T

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

= +25°C.) (Note 2)

Note 2: Specifications to -40°C are guaranteed by design, not production tested.

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MAX8506/MAX8507/MAX8508 1

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Rainbow-electronics MAX8508 Manual de usuario Pagina 3

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