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MAX8507ETE
PWM Step-Down DC-DC Converters with 75m? Bypass FET for WCDMA and cdmaOne Handsets
General DescriptionThe MAX8506/MAX8507/MAX8508 integrate a PWM step-
down DC-DC regulator and a 75mΩ(typ) bypass FET to
power the PA in WCDMA and cdmaOne™ cell phones.
The supply voltage range is from 2.6V to 5.5V, and the
guaranteed output current is 600mA. One megahertz
PWM switching allows for small external components.
The MAX8506 and MAX8507 are dynamically controlled
to provide varying output voltages from 0.4V to 3.4V. The
MAX8508 is externally programmed for fixed 0.75V to
3.4V output. Digital logic enables a high-power (HP)
bypass mode that connects the output directly to the bat-
tery for all versions. The MAX8506/MAX8507/MAX8508
are designed so the output settles in less than 30µs for a
full-scale change in output voltage and load current.
The MAX8506/MAX8507/MAX8508 are offered in 16-pin
4mm x 4mm thin QFN packages (0.8mm max height).
ApplicationsWCDMA/NCDMA Cell Phones
Wireless PDAs, Palmtops, and Notebook
Computers
Wireless Modems
FeaturesIntegrated 75mΩ(typ) Bypass FET38mV Dropout at 600mA LoadUp to 94% EfficiencyDynamically Adjustable Output from 0.4V to 3.4V
(MAX8506, MAX8507)Externally Fixed Output from 0.75V to 3.4V
(MAX8508)1MHz Fixed-Frequency PWM Switching600mA Guaranteed Output CurrentShutdown Mode 0.1µA (typ)16-Pin Thin QFN (4mm x 4mm, 0.8mm max Height)
MAX8506/MAX8507/MAX8508
PWM Step-Down DC-DC Converters with 75mΩ
Bypass FET for WCDMA and cdmaOne Handsets
Ordering Information19-2918; Rev 1; 1/04
cdmaOne is a trademark of CDMA Development Group.
Pin Configurations appear at end of data sheet.
Typical Application Circuits (MAX8506/MAX8507)
MAX8506/MAX8507/MAX8508
PWM Step-Down DC-DC Converters with 75mΩ
Bypass FET for WCDMA and cdmaOne Handsets
ABSOLUTE MAXIMUM RATINGSStresses 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 (VBATT+ 0.3V)
LX Current (Note 1)...............................................................1.6A
OUT Current (Note 1)............................................................3.2A
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA= +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(VBATT= VBATTP= 3.6V, SHDN= SKIP= BATT, HP = GND, VREFIN= 1.932V (MAX8506), VREFIN= 1.70V (MAX8507),
CREF= 0.22µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
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.
MAX8506/MAX8507/MAX8508
PWM Step-Down DC-DC Converters with 75mΩ
Bypass FET for WCDMA and cdmaOne Handsets
ELECTRICAL CHARACTERISTICS (continued)(VBATT= VBATTP= 3.6V, SHDN= SKIP= BATT, HP = GND, VREFIN= 1.932V (MAX8506), VREFIN= 1.70V (MAX8507),
CREF= 0.22µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
MAX8506/MAX8507/MAX8508
PWM Step-Down DC-DC Converters with 75mΩ
Bypass FET for WCDMA and cdmaOne Handsets
Typical Operating Characteristics(VBATT= VBATTP= 3.6V, SHDN= SKIP= BATT, HP = GND, TA= +25°C, unless otherwise noted.) (See the Typical Application Circuits.)
MAX8506/MAX8507/MAX8508
PWM Step-Down DC-DC Converters with 75mΩ
Bypass FET for WCDMA and cdmaOne Handsets
Typical Operating Characteristics (continued)(VBATT= VBATTP= 3.6V, SHDN= SKIP= BATT, HP = GND, TA= +25°C, unless otherwise noted.) (See the Typical Application Circuits.)
MAX8506/MAX8507/MAX8508
PWM Step-Down DC-DC Converters with 75mΩ
Bypass FET for WCDMA and cdmaOne Handsets
Detailed DescriptionThe MAX8506/MAX8507/MAX8508 PWM step-down DC-
DC converters with integrated bypass PFET are opti-
mized for low-voltage, battery-powered applications
where high efficiency and small size are priorities. An
analog control signal dynamically adjusts the MAX8506/
MAX8507s’ output voltage from 0.4V to 3.4V with a set-
tling time of 30µs. The MAX8508 uses external feedback
resistors to set the output voltage from 0.75V to 3.4V.
The MAX8506/MAX8507/MAX8508 operate at a high
1MHz switching frequency that reduces external com-
ponent size. Each device includes an internal synchro-
nous rectifier for high efficiency, which eliminates the
need for an external Schottky diode. The normal operat-
ing mode uses constant-frequency PWM switching at
medium and heavy loads and automatically pulse skips
at light loads to reduce supply current and extend bat-
tery life. A forced-PWM mode switches at a constant
frequency, regardless of load, to provide a well-con-
trolled spectrum in noise-sensitive applications. Battery
life is maximized by the low-dropout (75mΩ) high-
power mode and a 0.1µA (typ) logic-controlled shut-
down mode.
Pin Description
