MAX8649_11 Datasheet, PDF (1/31 Pages) Maxim Integrated Products – 1.8A Step-Down Regulator with Remote Sense in 2mm x 2mm WLP

19-4504; Rev 4; 6/11
EVAALVUAAILTAIOBNLEKIT
1.8A Step-Down Regulator with
Remote Sense in 2mm x 2mm WLP
General Description
The MAX8649/MAX8649A high-efficiency DC-to-DC step-
down switching regulators deliver up to 1.8A of output cur-
rent. The device operates from a 2.5V to 5.5V input
voltage range, making it future proof for next-generation
battery technologies. The output voltage is I²C program-
mable from 0.75V to 1.38V. Remote sense ensures pre-
cise DC regulation at the load. Total output error is less
than 2% over load, line, and temperature.
The ICs operate at a 3.25MHz fixed frequency. The high
operating frequency minimizes the size of external com-
ponents. The switching frequency of the converter can be
synchronized to the master clock of the application. When
synchronizing to an external clock, the ICs measure the
frequency of the external clock to ensure that the clock is
stable before changing the switching frequency to the
external clock frequency.
An on-board DAC allows adjustment of the output volt-
age in 10mV steps. The output voltage can be pro-
grammed directly through the I²C interface, or by
preloading a set of on-board registers and using the
two VID logic signals to select the appropriate register.
Other features include internal soft-start control circuitry
to reduce inrush current, output overvoltage, overcur-
rent, and overtemperature protection.
The ICs feature different I²C addresses so that devices
may be used in a system. For a 2.5A version of this
device, refer to the MAX8952 data sheet.
Applications
Cell Phones and Smartphones
PDAs and MP3 Players
Bump Configuration
+ ^IN1
A1
SNS+
B1
SNS-
C1
V_DD
D1
TOP VIEW
(BUMPS ON BOTTOM)
AGND
VID1
A2
A3
EN
LX
B2
B3
VID0
PGND
C2
C3
SDA
SCL
D2
D3
IN2
A4
LX
B4
PGND
C4
SYNC
D4
Features
o 1.8A Guaranteed Output Current
o I²C Programmable V_OUT (750mV to 1.38V in 10mV
Steps)
o Operates from 2.5V to 5.5V Input Supply
o On-Chip FET and Synchronous Rectifier
o Fixed 3.25MHz PWM Switching Frequency
o Synchronizes to 13MHz, 19.2MHz, or 26MHz
System Clock when Available
o Small 1.0µH Inductor
o Initial Accuracy 0.5% at 1.25V Output
o 2% Output Accuracy Over Load, Line, and
Temperature
o Power-Save Mode Increases Light Load Efficiency
o Overvoltage and Overcurrent Protection
o Thermal Shutdown Protection
o 400kHz I²C Interface
o < 1µA Shutdown Current
o 16-Bump, 2mm x 2mm WLP Package
Ordering Information
PART
PIN-PACKAGE
I²C ADDRESS
(WRITE/READ)
MAX8649EWE+T 16 WLP (0.5mm pitch)
MAX8649AEWE+T 16 WLP (0.5mm pitch)
0xC0/0xC1
0xC4/0xC5
+Denotes a lead(Pb)-free/RoHS-compliant package.
Note: All devices operate over the -40°C to +85°C temperature
range.
Typical Operating Circuit
1.8V TO
3.6V
2.5V TO
5.5V
0.1μF
11Ω
2.2μF
0.1μF
MAX8649
MAX8649A IN2
V_DD
LX
SCL
SDA
PGND
IN1
FSYNC
EN
SNS+
VID0
VID1
SNS-
AGND
1μH
10μF
2.5V TO
5.5V
10μF
0.1μF
V_OUT
0.1μF
(0.75V TO
1.38V)
CPU
WLP 0.5mm PITCH
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.