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Description: The MAX8500MAX8504 PWM DC-to-DC buck converters are optimized with integrated bypass FET (0.25 typ) to...


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MAX8504 General Description


The MAX8500MAX8504 PWM DC-to-DC buck converters are optimized with integrated bypass FET (0.25 typ) to provide power to the PA in N-CDMA and W-CDMA cell phones. The devices have a low on-resistance FET to bypass the external inductor for low dropout of only 150mV at 600mA load, regardless of inductor series resistance. The supply voltage range is from 2.6V to 5.5V and the guaranteed converter output current is 600mA. The 1MHz PWM switching frequency allows for small external components.

The MAX8500MAX8503 are dynamically controlled to provide varying output voltages from 0.4V to VBATT. The LDO regulation point is slightly lower than the PWM converter such that the transition into and out of dropout is smooth, regardless of the inductor resistance. The MAX8504 is programmed for fixed 1.25V to 2.5V output with external resistors. It features a high-power bypass mode that connects the output directly to the battery. All devices are  esigned to achieve an output settling time of less than 30s for a full-scale change in output voltage and load  urrent.

The MAX8500MAX8504 are available in a 12-lead 4mm x 4mm thin QFN package (0.8mm max height).

MAX8504 Maximum Ratings

ABSOLUTE MAXIMUM RATINGS
BATTP, BATT, OUT, SHDN, SKIP, HP,
REFIN, FB to GND ....................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
REF, COMP to GND .................................-0.3V to (VBATT + 0.3V)
LX Current (Note 1) ...........................................................2.25A
Output Short-Circuit Duration .......................................Indefinite
Continuous Power Dissipation (TA = +70°C)
12-Lead Thin QFN (derate 16.9mW/°C above +70°C) .1349mW
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

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.

Note 1: LX has internal clamp diodes to PGND and BATTP. Applications that forward bias these diodes should take care not to exceed the IC's package power dissipation limits.

MAX8504 Features

Integrated Bypass PFET
150mV Dropout at 600mA Load (Regardless of External Inductor)
Dynamically Adjustable Output from 0.4V to VBATT
Externally Fixed Output from 1.25V to 2.5V with Digitally Controlled High-Power
    Bypass Mode (MAX8504)
1MHz Fixed-Frequency PWM Switching
600mA Guaranteed Output Current
10% to 100% Duty-Cycle Operation
Low Quiescent Current
    280A (typ) in Normal Mode
    3.3mA (typ) in PWM Mode
    0.1A (typ) in Shutdown Mode
12-Pin Thin QFN (4mm x 4mm, 0.8mm max Height)

MAX8504 Typical Application

N-CDMA/W-CDMA Cellular Phones
Wireless PDAs and Modems

MAX8504 Connection Diagram

MAX8504  Connection Diagram

MAX8504 datasheet

MAX8504
PDF/DataSheet Download

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