MAX8506 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – PWM Step-Down DC-DC Converters with 75m Bypass FET for WCDMA and cdmaOne Handsets

19-2918; Rev 1; 1/04
PWM Step-Down DC-DC Converters with 75mΩ
Bypass FET for WCDMA and cdmaOne Handsets
General Description
The 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).
Applications
WCDMA/NCDMA Cell Phones
Wireless PDAs, Palmtops, and Notebook
Computers
Wireless Modems
Features
♦ Integrated 75mΩ (typ) Bypass FET
♦ 38mV Dropout at 600mA Load
♦ Up to 94% Efficiency
♦ Dynamically Adjustable Output from 0.4V to 3.4V
(MAX8506, MAX8507)
♦ Externally Fixed Output from 0.75V to 3.4V
(MAX8508)
♦ 1MHz Fixed-Frequency PWM Switching
♦ 600mA Guaranteed Output Current
♦ Shutdown Mode 0.1µA (typ)
♦ 16-Pin Thin QFN (4mm x 4mm, 0.8mm max Height)
PART
MAX8506ETE
MAX8507ETE
MAX8508ETE
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 Thin QFN
16 Thin QFN
16 Thin QFN
cdmaOne is a trademark of CDMA Development Group.
Pin Configurations appear at end of data sheet.
Typical Application Circuits (MAX8506/MAX8507)
INPUT
2 6V TO 5.5V
2 2µF
0.22µF
SKIP
SHDN
MAX8506
MAX8507
REF
REF
PWM
1MHz
OSC
HP
4.7µH
BATTP LX
BATT
0 075Ω
CURRENT-
0.4Ω
LIMIT
CONTROL
0.3Ω
OUTPUT
0.4V TO 3.4V OR V_BATT
4.7µF
OUT
REFIN
DAC
COMP
PGND
GND
R_C*
C_f*
* R_C (kΩ) C_C (pF) C_f (pF)
MAX8506 10 1500 100
C_C*
MAX8507 15 1000 100
Typical Application Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.