MAX8649 Просмотр технического описания (PDF) - Maxim Integrated
Номер в каталоге
Компоненты Описание
производитель
MAX8649 Datasheet PDF : 31 Pages
| |||
1.8A Step-Down Regulator with
Remote Sense in 2mm x 2mm WLP
SYNC
VDD
SCL
SDA
IN1
EN
VID0
VID1
AGND
OSC
CLOCK GEN
I2C INTERFACE
PWM LOGIC
VOLTAGE
CONTROL, VREF,
BIAS, ETC.
VDAC
MAX8649
MAX8649A
IN2
LX
PGND
SNS+
SNS-
Figure 1. Block Diagram
Detailed Description
The MAX8649/MAX8649A high-efficiency, 3.25MHz
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, and the output voltage is I2C pro-
grammable from 0.75V to 1.38V in 10mV increments.
Remote sense ensures precise DC regulation at the
load. Total output error is less than 2% over load, line,
and temperature. The ICs feature different I2C address-
es so that multiple devices may be used in a system
(see the Ordering Information section.)
Dynamic Voltage Scaling
The output voltage is dynamically adjusted by use of
the VID0 and VID1 logic inputs, allowing selection
between four predefined operation modes/voltage
configurations.
For each of the different output modes, the following
parameters are programmable:
• 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
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 ICs are enabled, achieving lowest
possible quiescent current. When EN is low, the CON-
TROL register is reset to default, enabling the pulldown
resistors (see Table 7).
Table 1. VID0 and VID1 Configuration
VID1
VID0
MODE
I2C REGISTER
0
0
MODE0
Table 3
0
1
MODE1
Table 4
1
0
MODE2
Table 5
1
1
MODE3
Table 6
DEFAULT
SWITHCING
MODE
FORCED PWM
POWER SAVE
FORCED PWM
FORCED PWM
DEFAULT
SYN C H R O N IZ A TIO N
OFF
OFF
OFF
OFF
DEFAULT
OUTPUT
VOLTAGE (V)
1.27
1.05
1.23
1.05
______________________________________________________________________________________ 11
Share Link: 