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ATION
AILABL
19-0593; Rev 1; 1/07
KIT
EVALU E
AV
2.5MHz/1.5MHz Step-Down Converters
with 60m ? Bypass in TDFN for CDMA PA Power
General Description
The MAX8581/MAX8582 high-frequency step-down con-
verters are optimized for dynamically powering the power
amplifier (PA) in CDMA handsets. They integrate a high-
efficiency PWM step-down converter for medium- and
low-power transmission and a 60m ? (typ) bypass mode
to power the PA directly from the battery during high-
power transmission. They use an analog input driven by
an external DAC to control the output voltage linearly for
continuous PA power adjustment. The MAX8581/
MAX8582 use an internal feedback network, and the
switching frequency is internally set to 2.5MHz and
1.5MHz, respectively.
Fast switching (up to 2.5MHz) and fast soft-start allow
the use of ceramic 2.2μF input and output capacitors
while maintaining low voltage ripple. The small 1.5μH to
3.3μH inductor size can be optimized for efficiency.
The MAX8581/MAX8582 are available in 10-pin, 3mm x
3mm TDFN packages (0.8mm max height).
Applications
Features
? 600mA Step-Down Converter
? 60m ? (typ) Bypass Mode with Integrated FET
? Dynamically Adjustable Output from 0.4V to V IN
? 2.5MHz and 1.5MHz Switching Frequency
? Small LC Components: 1.5μH to 3.3μH and 2.2μF
? Up to 94% Efficiency
? Low Output Ripple at All Loads
? 2.7V to 5.5V Input
? 0.1μA Shutdown Mode
? Output Short-Circuit Protection
? Thermal Shutdown
? 10-Pin, 3mm x 3mm TDFN Packag es
Ordering Information
WCDMA/NCDMA Cell Phones
Wireless PDAs, Smartphones
PART*
MAX8581 ETB+
MAX8582 ETB+
PIN-
PACKAGE
10 TDFN-EP**
10 TDFN-EP**
TOP
MARK
ACT
ACU
PKG
CODE
T1033-1
T1033-1
* All devices are specified in the -40°C to +85°C extended
temperature range.
** EP = Exposed pad.
+ Denotes a lead-free package.
Typical Operating Circuit
Pin Configuration
INPUT
Li+ BATTERY
IN
OUT
OUTPUT
0.4V TO V BATT
TOP VIEW
2.2 μ F
GND
MAX8581
MAX8582
LX
1.5 μ H OR 3.3 μ H
2.2 μ F
10
9
8
MAX8581/
7
6
MAX8582
ON/OFF
SHDN
ANALOG
CONTROL
REFIN
HP
FORCED BYPASS
+
1
2
3
4
5
________________________________________________________________ Maxim Integrated Products
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.
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