MAX77179 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – High-Bandwidth LTE/WCDMA PA Power Management ICs

EVALUATION KIT AVAILABLE
MAX77178 / MAX77179
High-Bandwidth LTE/WCDMA PA Power Management ICs
in a 1.75mm x 1.4mm, 0.4mm Pitch WLP
General Description
The MAX77178/MAX77179 step-down converters are
optimized for powering the power amplifier (PA) in mul-
timode/multiband handsets for 3G/4G applications such
as LTE, WCDMA, as well as other RF PA applications
such as Wi-FiM and WiMAXM.
The 2.5V to 5.5V input supply range supports both current
and future battery chemistries. The MAX77179 uses an
analog input driven by an external DAC to control the output
voltage linearly for continuous PA power adjustment. The
output voltage range (0.5V to V_IN) supports operation with
a wide variety of PAs. The MAX77178 uses a 2-bit GPIO
interface with four selectable output voltage options to
control the output voltage supply for PA power adjustment.
Fast switching frequency (8MHz, typ) allows the use of
low value inductor and small ceramic output capaci-
tors while maintaining low-ripple voltage. Efficiency
is enhanced at light loads by switching to skip mode
where the converter switches only as needed to service
the load. Adaptive smart FET scaling further improves
efficiency under all operating conditions.
Other features include overcurrent and overtemperature
protection, and a very low-current (0.1µA, typ) shutdown
mode.
WiMAX is a registered certification mark and service mark of
WiMAX Forum.
Wi-Fi is a registered certification mark of Wi-Fi Alliance
Corporation.
Features
S Meet 3G/4G Timing and RF Spectrum Mask
Requirements
 20µs (typ) Settling Time for 0.5V to 3.4V Output
Voltage Change
 30µs (typ) Settling from Enable to 95% Output
Voltage Regulation
S Four Selectable Output Voltages with Logic Inputs
(MAX77178 Only)
S Analog Controlled Output Voltage Settings from
0.5V to V_IN (MAX77179 Only)
S 1A Peak Output Current Capability
S ±3% Output Voltage Accuracy
S Allows Use of Small (1210) 0.47µH Inductor
S 100% Duty-Cycle Operation
S Simple Logic On/Off Controls
S < 1µA Shutdown Supply Current
S 2.5V to 5.5V Supply Voltage Range
S Overcurrent and Overtemperature Protection
Applications
LTE, WCDMA Cell Phones/Smartphones /Tablets/
Data Cards
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maximintegrated.com/MAX77178.related.
Typical Operating Circuit
VIN
IN3
IN1
C4
IN2
1µF
(REF)
MAX77178
MAX77179
SEL0 (MODE_SEL)
LX
SEL1 (BYP)
PGND
EN
FB
AGND
GSNS
C2
4.7µF
0.47µH
VOUT
C3
4.7µF
VIN
C1
0.1µF
C5
0.1µF
NOTE: ( ) FOR MAX77179
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6405; Rev 0; 3/13