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Rainbow-electronics MAX8649 Manual de usuario

Busca en linea o descarga Manual de usuario para Sensores Rainbow-electronics MAX8649. Rainbow Electronics MAX8649 User Manual Manual de usuario

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General Description
The MAX8649 high-efficiency DC-to-DC step-down
switching regulator delivers up to 1.8A of output current.
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 I
2
C programmable
from 0.75V to 1.38V. Fully differential remote sense
ensures precise DC regulation at the load. Total output
error is less than 2% over load, line, and temperature.
The MAX8649 operates at a 3.25MHz fixed frequency.
The high operating frequency minimizes the size of exter-
nal components. The switching frequency of the converter
can be synchronized to the master clock of the applica-
tion. When synchronizing to an external clock, the
MAX8649 measures 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 I
2
C 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.
Applications
Cell Phones and Smartphones
PDAs and MP3 Players
Features
o 1.8A Guaranteed Output Current
o I
2
C 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 I
2
C Interface
o < 1µA Shutdown Current
o 16-Bump, 2mm x 2mm WLP Package
MAX8649
1.8A Step-Down Regulator with Differential
Remote Sense in 2mm x 2mm WLP
________________________________________________________________
Maxim Integrated Products
1
19-4504; Rev 0; 9/09
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.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX8649EWE+T -40°C to +85°C
16 Bump WLP
(0.5mm pitch)
+
Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
+
WLP 0.5mm PITCH
B2 B4
C4
B3B1
A4A3A2A1
D4
C1
D1
C3C2
D3D2
IN1 AGND IN2
EN LX LX
SNS- VID0
PGND
PGND
V
DD
SDA
SCL
SYNC
VID1
SNS+
TOP VIEW
(BUMPS ON BOTTOM
Typical Operating Circuit
2.5V TO
5.5V
V
OUT
(0.75V TO
1.38V)
LX
IN2
V
DD
SCL
0V TO
4.0V
2.5V TO
5.5V
11Ω
0.1μF
10μF0.1μF
10μF0.1μF
SDA
IN1
FSYNC
PGND
SNS+
SNS-
EN
VID0
VID1
AGND
MAX8649
1μH
CPU
2.2μF 0.1μF
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Indice de contenidos

Pagina 1 - Remote Sense in 2mm x 2mm WLP

General DescriptionThe MAX8649 high-efficiency DC-to-DC step-downswitching regulator delivers up to 1.8A of output current.The device operates from a

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MAX86491.8A Step-Down Regulator with DifferentialRemote Sense in 2mm x 2mm WLP10 _____________________________________________________________________

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MAX86491.8A Step-Down Regulator with DifferentialRemote Sense in 2mm x 2mm WLP14 _____________________________________________________________________

Pagina 7

MAX8649Soft-StartThe MAX8649 includes internal soft-start circuitry thateliminates inrush current at startup, reducing transientson the input source (

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MAX86491.8A Step-Down Regulator with DifferentialRemote Sense in 2mm x 2mm WLP30 _____________________________________________________________________

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MAX86491.8A Step-Down Regulator with DifferentialRemote Sense in 2mm x 2mm WLPMaxim cannot assume responsibility for use of any circuitry other than c

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MAX86491.8A Step-Down Regulator with DifferentialRemote Sense in 2mm x 2mm WLP________________________________________________________________________

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MAX86491.8A Step-Down Regulator with DifferentialRemote Sense in 2mm x 2mm WLP________________________________________________________________________

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