MAX8649EWE+T Maxim Integrated Products, MAX8649EWE+T Datasheet

IC REG STEP-DOWN 1.8A 16-WLP

MAX8649EWE+T

Manufacturer Part Number
MAX8649EWE+T
Description
IC REG STEP-DOWN 1.8A 16-WLP
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet

Specifications of MAX8649EWE+T

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.75 ~ 1.38 V
Current - Output
1.8A
Frequency - Switching
3.25MHz
Voltage - Input
2.5 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-WLP
Power - Output
1.04W
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
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
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.
19-4504; Rev 2; 2/11
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.
Cell Phones and Smartphones
PDAs and MP3 Players
+
1.8A Step-Down Regulator with Differential
SNS+
SNS-
V
IN1
A1
B1
C1
D1
DD
________________________________________________________________ Maxim Integrated Products
WLP 0.5mm PITCH
AGND
(BUMPS ON BOTTOM
VID0
SDA
A2
EN
B2
C2
D2
General Description
TOP VIEW
Pin Configuration
PGND
SCL
VID1
C3
D3
A3
B3
LX
Remote Sense in 2mm x 2mm WLP
2
Applications
C interface, or by
2
C programmable
PGND
SYNC
IN2
A4
LX
B4
C4
D4
o 1.8A Guaranteed Output Current
o I
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
o Small 1.0µH Inductor
o Initial Accuracy 0.5% at 1.25V Output
o 2% Output Accuracy Over Load, Line, and
o Power-Save Mode Increases Light Load Efficiency
o Overvoltage and Overcurrent Protection
o Thermal Shutdown Protection
o 400kHz I
o < 1µA Shutdown Current
o 16-Bump, 2mm x 2mm WLP Package
+ Denotes a lead(Pb)-free/RoHS-compliant package.
2.2μF
2.5V TO
0V TO
MAX8649EWE+T
4.0V
5.5V
Steps)
System Clock when Available
Temperature
2
C Programmable V
PART
0.1μF
0.1μF
11Ω
2
C Interface
Typical Operating Circuit
V
SCL
SDA
IN1
FSYNC
EN
VID0
VID1
DD
MAX8649
AGND
-40°C to +85°C
TEMP RANGE
Ordering Information
OUT
PGND
SNS+
SNS-
IN2
LX
(750mV to 1.38V in 10mV
1μH
10μF
PIN-PACKAGE
16 Bump WLP
(0.5mm pitch)
Features
10μF
0.1μF
CPU
V
(0.75V TO
1.38V)
OUT
2.5V TO
5.5V
0.1μF
1

Related parts for MAX8649EWE+T

MAX8649EWE+T Summary of contents

Page 1

... Output Accuracy Over Load, Line, and Temperature o Power-Save Mode Increases Light Load Efficiency o Overvoltage and Overcurrent Protection o Thermal Shutdown Protection C interface 400kHz I o < 1µA Shutdown Current o 16-Bump, 2mm x 2mm WLP Package Applications PART MAX8649EWE+T + Denotes a lead(Pb)-free/RoHS-compliant package 4.0V IN2 A4 0.1μF 2. 5.5V B4 11Ω ...

Page 2

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP ABSOLUTE MAXIMUM RATINGS IN1, IN2 to AGND ..................................................-0.3V to +6. AGND.........................................................-0.3V to +4.0V DD LX, SNS+, VID0, VID1 AGND..........-0. SCL, SDA, SYNC ...

Page 3

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP ELECTRICAL CHARACTERISTICS (continued 3.6V IN1 IN2 AGND PGND +25°C.) (Note 2) PARAMETER Controlled by I VID0, VID1, EN Logic Input VID0_PD ...

Page 4

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP ELECTRICAL CHARACTERISTICS (continued 3.6V IN1 IN2 AGND PGND +25°C.) (Note 2) PARAMETER No load, V OPERATION_MODE_ = 1 I OUT OUT ...

Page 5

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP ELECTRICAL CHARACTERISTICS (continued 3.6V IN1 IN2 AGND PGND +25°C.) (Note 2) PARAMETER Forced PWM mode only, minimum duty cycle in Minimum ...

Page 6

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP ( Typical Operating Circuit , 3.6V, V IN1 IN2 EFFICIENCY vs. LOAD CURRENT (0.9V OUTPUT, SYNC OFF) 100 POWER SAVE ...

Page 7

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP ( Typical Operating Circuit , 3.6V, V IN1 IN2 NO-LOAD SUPPLY CURRENT vs. SUPPLY VOLTAGE (FORCED PWM SYNC ...

Page 8

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP ( Typical Operating Circuit , 3.6V, V IN1 IN2 LIGHT LOAD STARTUP WAVEFORMS 10I LOAD V OUT 200µs/div ...

Page 9

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP (T = +25°C, unless otherwise noted.) A LOAD TRANSIENT RESPONSE (1A to 1mA) V OUT OUT 40µs/div LOAD TRANSIENT RESPONSE (1.8A to 5mA) V OUT ...

Page 10

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP BUMP NAME Anal tag e Inp ut. The vol tag e r ang 2.5V ...

Page 11

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP SYNC V DD SCL SDA IN1 EN VID1 VID2 AGND Figure 1. Block Diagram Detailed Description The MAX8649 high-efficiency, 3.25MHz step-down switching regulator delivers up to 1.8A of ...

Page 12

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP The MAX8649 DC-DC step-down regulator is enabled/disabled using the EN logic input. The EN input is able to handle input voltages ing that the EN ...

Page 13

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP IN OUT PULLED LOW REGISTERS RESET TO DEFAULT VALUES (SEE TABLE 1) AND THE OUTPUT VOLTAGE CHANGES TO THE DEFAULT ...

Page 14

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP The transition between PWM and hysteretic operation is based on the number of consecutive zero-crossing cycles. When more than 16 consecutive zero-crossing cycles are detected, the DC-DC step-down ...

Page 15

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP The MAX8649 includes internal soft-start circuitry that eliminates inrush current at startup, reducing transients on the input source (see the Typical Operating Charac- teristics ). Soft-start is particularly ...

Page 16

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP SDA SCL DATA LINE STABLE DATA VALID 2 Figure Bit Transfer Thermal-Overload Protection Thermal-overload protection limits total power dissipa- tion in the MAX8649. When internal ...

Page 17

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP SDA SCL MASTER TRANSMITTER/RECEIVER 2 Figure 11 Master/Slave Configuration A START condition from the master signals the begin- ning of a transmission to the MAX8649. The ...

Page 18

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP A B OUT SDA S SLAVE ID VID0 VID1 START COMMAND SLAVE ADDRESS OF MAX8649 SEND OUT. 2 ...

Page 19

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP LEGEND MASTER TO SLAVE SLAVE TO MASTER a) WRITING TO A SINGLE REGISTER WITH THE WRITE BYTE PROTOCOL SLAVE ADDRESS 0 A R/W ...

Page 20

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP LEGEND MASTER TO SLAVE SLAVE TO MASTER a) READING A SINGLE REGISTER SLAVE ADDRESS 0 A REGISTER POINTER R/W b) READING MULTIPLE REGISTERS ...

Page 21

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP 2 Table Register Map POINTER REGISTER POR 0x00 MODE0 0xB4 0x01 MODE1 0x1E 0x02 MODE2 0xB0 0x03 MODE3 0x9E CONTROL 0xE0 0x04 0x05 SYNC 0x00 ...

Page 22

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP 2 Table Register: MODE1 This register contains output voltage and operation mode control for MODE1, VID1 = GND, VID0 = V REGISTER NAME Address Reset ...

Page 23

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP 2 Table Register: MODE2 This register contains output voltage and operation mode control for MODE2, VID1 = V REGISTER NAME Address Reset Value Type Special ...

Page 24

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP 2 Table Register: MODE3 This register contains output voltage and operation mode control for MODE3, VID1 = V REGISTER NAME Address Reset Value Type Special ...

Page 25

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP 2 Table Register: CONTROL This register enables or disables pulldown resistors. REGISTER NAME Address Reset Value Type Special Features BIT NAME B7 (MSB) EN_PD B6 ...

Page 26

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP 2 Table Register: SYNC This register specifies the clock frequency of external clock source. REGISTER NAME Address Reset Value Type Special Features BIT NAME B7 ...

Page 27

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP 2 Table Register: RAMP This register controls of ramp-up/down function. REGISTER NAME Address Reset Value Type Special Features BIT NAME B7 (MSB) B6 RAMP[2:0] B5 ...

Page 28

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP 2 Table 10 Register: CHIP_ID1 This register contains the die type number (20). REGISTER NAME Address Reset Value Type Special Features BIT NAME B7 (MSB) B6 ...

Page 29

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP Applications Information Inductor Selection Calculate the inductor value (L IDEAL ing formula: × × × IDEAL × OUT MAX ...

Page 30

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP Input Capacitor Selection The input capacitor in a step-down DC-DC regulator reduces current peaks drawn from the battery or other input power source and reduces switching noise in ...

Page 31

Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP For the latest package outline information and land patterns (footprints www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. ...

Page 32

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 32 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2011 Maxim Integrated Products ...

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