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Overview

The MAX8939 power management IC includes the necessary power and features to support handset design for the Intel Mobile Communications (IMC) 61XX 3G platform. The MAX8939 is designed to power all of the platform's peripheral circuitry, providing the necessary signals to control the 61XX baseband processor.

The integrated Li-Ion (Li+) charger features up to 28V input protection and a protected output power supply for USB transceivers. A proprietary thermal management circuit can limit the die temperature during fast charging or when the chip is exposed to high temperatures, allowing maximum charging current without damaging the IC. A current regulator is provided to drive the charge indicator LED.

Four programmable low noise, low dropout linear regulators (LDOs) power the noise sensitive peripheral circuitry. The high power oscillator driver can program 70 PWM levels and 4 output voltages via I2C. The device also offers two boost converters, one high-power, low-voltage (5V) power supply for external audio amplifiers or camera flash, and a high-voltage (28V) power supply for the display and keyboard backlight. Two integrated 25mA current regulators are available through I2C programming to provide independent linear rise and fall control.

The MAX8939/MAX8939A are highly integrated ICs that require a small package size of 2.5mm x 3.0mm and a maximum height of 0.65mm in a wafer-level package (WLP) with few external components.

Key characteristics

Boost converter guarantees output current of 700mA can be programmed by I2C 3.5V to 5.0V, 16-stage output efficiency is greater than 90%
On-chip FET and synchronous rectification
2MHz fixed PWM switching frequency
2.2μH to 10μH small size inductor
WLED boost converter
28V maximum boost output voltage
60mA output current integrated NMOS power switch efficiency greater than 90%
2MHz fixed switching frequency
4.7μH to 10μH Small Size Inductor Two 25mA Independently Programmable Current Regulators
I2C programmable output current (50μA to 25.25mA) with 128-stage pseudo-logarithmic dimming independently programmable ramp (up/down) timer low dropout (max. 150mV)
Single-Cell Li+ Battery Linear Charger Eliminates the Need for External MOSFET, Reverse Isolation Diode, or Current-Sense Resistor Programmable Fast Charge Current (MAX8939: 1.5ARMS Maximum; MAX8939A: 850mARMS Maximum)
Programmable float current threshold with proprietary die temperature control
4.1V to 10V input voltage range (MAX8939)
4.1V to 6.25V input voltage range (MAX8939A) with input overvoltage protection low dropout of up to 28V (300mV at 500mA)
Input power detection indication output
4.75V output with input overvoltage protection on the IN terminal (SAFE_OUT)
Charge current monitoring output
LED indicates hardware input enables 5s watchdog four low noise LDO during charging
1 way 400mA, 2 way 200mA and 1 way 100mA output current
65dB (typ) high PSRR
Low noise (45μVRMS, typical)
1.7V to 3.2V Programmable Output Voltage Low Quiescent Current (25μA, Typical)
400mA LDO with hardware enable input
Oscillating driver guarantees 200mA output current
1.3V to VINVIB Programmable Output Voltage
23.8kHz repetition rate
70-level PWM rate control effectively stops braking
61XX baseband control interface controls MAX8939 through I2C
/RESET_IN reset input charger detects PWR_ON_CMP output
/IRQ interrupt output
Thermal shutdown from 2.9V to 5.5V supply range

Application/use

Mobile phone / smart phone accessory products

MAX8939 application circuit

See the PDF document for details!