Rainbow-electronics MAX8508 Manual de usuario descargar pdf (Pagina 2)

MAX8506/MAX8507/MAX8508

PWM Step-Down DC-DC Converters with 75m

Ω

Bypass FET for WCDMA and cdmaOne Handsets

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

BATTP, BATT, OUT, SHDN, SKIP, HP, REFIN,

FB to GND ...........................................................-0.3V to +6V

PGND to GND .......................................................-0.3V to +0.3V

BATT to BATTP......................................................-0.3V to +0.3V

OUT, COMP, REF to GND.......................-0.3V to (V

BATT

+ 0.3V)

LX Current (Note 1)...............................................................1.6A

OUT Current (Note 1)............................................................3.2A

Output Short-Circuit Duration.....................................Continuous

Continuous Power Dissipation (T

= +70°C)

16-Pin Thin QFN (derate 16.9mW/°C above +70°C) ...1.349W

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

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)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

Input BATT Voltage 2.6 5.5 V

Undervoltage Lockout Threshold

BATT

rising

2.150 2.35 2.575

Undervoltage Lockout Hysteresis

40 mV

SKIP = GND (normal mode)

180 250

Quiescent Current

SKIP = BATT, 1MHz switching

1750

µA

Quiescent Current in Dropout HP = BATT

775 1000

µA

Shutdown Supply Current SHDN = GND 0.1 5 µA

REFIN

= 1.932V, I

OUT

= 0 to 600mA (MAX8506)

3.375 3.40 3.425

REFIN

= 0.426V, I

OUT

= 0 to 30mA (MAX8506)

0.740 0.75 0.760

REFIN

= 1.700V, I

OUT

= 0 to 600mA (MAX8507)

3.375 3.40 3.425

OUT Voltage Accuracy

REFIN

= 0.375V, I

OUT

= 0 to 30mA (MAX8507)

0.740 0.75 0.760

MAX8506

250 485

OUT Input Resistance

MAX8507

275 535

kΩ

REFIN Input Current -1 0.1 +1 µA

MAX8506

1.76

REFIN to OUT Gain

MAX8507

2.00

V/V

Reference Voltage

1.225 1.25 1.275

Reference Load Regulation 10µA < I

REF

< 100µA 2.5 8.5 mV

Reference Bypass Capacitor 0.1

0.22

µF

FB Voltage Accuracy FB = COMP (MAX8508)

0.7275 0.75 0.7725

FB Input Current V

= 1V (MAX8508)

0.03 0.175

µA

BATT

= 3.6V 0.4

0.825

P-Channel On-Resistance I

= 180mA

BATT

= 2.6V 0.5

Ω

BATT

= 3.6V 0.3 0.5

N-Channel On-Resistance I

= 180mA

BATT

= 2.6V

0.35

Ω

HP/Bypass P-Channel

On-Resistance

OUT

= 180mA, V

BATT

= 3.6V

0.075 0.110

Ω

Note 1: LX has internal clamp diodes to PGND and BATT. Applications that forward bias these diodes should take care not to exceed

the IC’s package power-dissipation limits.

1 2 3 4 5 6 7 ... 10 11

MAX8506/MAX8507/MAX8508 1

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Rainbow-electronics MAX8508 Manual de usuario Pagina 2

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