MAX8649 Maxim Integrated Products, MAX8649 Datasheet - Page 11

• Manufacturer Part Number: MAX8649
• Description: 1.8A Step-Down Regulator
• Manufacturer: Maxim Integrated Products

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Figure 1. Block Diagram
The MAX8649 high-efficiency, 3.25MHz step-down
switching regulator delivers up to 1.8A of output cur-
rent. The device operates from a 2.5V to 5.5V input
voltage range, and the output voltage is I
mable from 0.75V to 1.38V in 10mV increments. Fully
differential remote sense ensures precise DC regula-
tion at the load. Total output error is less than 2% over
load, line, and temperature.
The output voltage is dynamically adjusted by use of
the VID0 and VID1 logic inputs, allowing selection
between four predefined operation modes/voltage
configurations.
Table 1. VID0 and VID1 Configuration
VID0
0
0
1
1
1.8A Step-Down Regulator with Differential
______________________________________________________________________________________
VID1
0
1
0
1
Detailed Description
Dynamic Voltage Scaling
AGND
SYNC
VID1
VID2
SCL
SDA
V
IN1
EN
DD
Remote Sense in 2mm x 2mm WLP
MODE0
MODE1
MODE2
MODE3
MODE
OSC
CONTROL, V
I
2
C INTERFACE
BIAS, ETC.
VOLTAGE
2
C program-
REF
I
2
,
C REGISTER
Table 3
Table 4
Table 5
Table 6
CLOCK GEN
V
DAC
For each of the different output modes, the following
parameters are programmable:
•
•
•
The relation between the VID0/VID1 and operation
mode is given by Table 1.
The VID_ inputs have internal pulldown resistors. These
pulldown resistors can be disabled through the CONTROL
register after the MAX8649 is enabled, achieving low-
est possible quiescent current. When EN is low, the
CONTROL register is reset to default, enabling the pull-
down resistors (see Table 7).
PWM LOGIC
Output voltage from 0.75V to 1.38V in 10mV steps
Mode of operation: Forced PWM or power save
Enable/disable of synchronization of switching
frequency to external clock source
FORCED PWM
FORCED PWM
FORCED PWM
POWER SAVE
SWITHCING
DEFAULT
MODE
SYN C H R O N IZ A TIO N
DEFAULT
IN2
LX
PGND
SNS+
SNS-
OFF
OFF
OFF
OFF
VOLTAGE (V)
DEFAULT
OUTPUT
1.05
1.27
1.22
1.05
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