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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8649 Datasheet

1.8A Step-Down Regulator

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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
VDD
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 VOUT (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
VDD
LX
SCL
SDA
PGND
IN1
FSYNC
EN
SNS+
VID0
VID1 SNS-
AGND
1μH
10μF
2.5V TO
5.5V
10μF
0.1μF
VOUT
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8649 Datasheet

1.8A Step-Down Regulator

No Preview Available !

1.8A Step-Down Regulator with
Remote Sense in 2mm x 2mm WLP
ABSOLUTE MAXIMUM RATINGS
IN1, IN2 to AGND ..................................................-0.3V to +6.0V
VDD to AGND.........................................................-0.3V to +4.0V
LX, SNS+, VID0, VID1, EN to AGND..........-0.3V to (VIN1 + 0.3V)
SCL, SDA, SYNC to AGND.........................-0.3V to (VDD + 0.3V)
PGND, SNS- to AGND...........................................-0.3V to +0.3V
RMS LX Current ..............................................................1800mA
Continuous Power Dissipation (TA = +70°C)
16-Bump WLP 0.5mm Pitch
(derate 13mW/°C above +70°C) ............................1040mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
WLP
Junction to Ambient Thermal Resistance (θJA)............76°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(VIN1 = VIN2 = 3.6V, VAGND = VPGND = 0V, VDD = 1.8V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 2)
PARAMETER
IN1, IN2 Operating Range
VDD Operating Range
VDD Undervoltage Lockout
(UVLO) Threshold
VDD UVLO Hysteresis
IN_ Undervoltage Lockout
(UVLO) Threshold
IN_ UVLO Hysteresis
VDD Shutdown Supply Current
IN1, IN2 Shutdown Supply
Current
IN1, IN2 Standby Supply Current
VDD Standby Supply Current
LOGIC INTERFACE
Logic Input High Voltage (VIH)
Logic Input Low Voltage (VIL)
SDA, SCL, SYNC Logic Input
Current
CONDITIONS
VDD falling
VIN falling
VIN1 = VIN2 = 5.5V,
EN = VDD = AGND
VIN1 = VIN2 = 5.5V,
EN = VDD = AGND
VIN1 = VIN2 = 5.5V, SCL = SDA =
VDD, EN = AGND, I2C ready
VIN1 = VIN2 = VDD = 3.6V,
SCL = SDA = VDD, EN = AGND,
I2C ready
TA = +25°C
TA = +85°C
TA = +25°C
TA = +85°C
TA = +25°C
TA = +85°C
TA = +25°C
TA = +85°C
VIN1 = VIN2 = 2.5V to 5.5V,
VDD = 1.8V to 3.6V
VIN1 = VIN2 = 2.5V to 5.5V,
VDD = 1.8V to 3.6V
VIL = 0V or VIH = 3.6V,
EN = AGND
EN, VID0, VID1
SYNC, SCL, SDA
EN, VID0, VID1
SYNC, SCL, SDA
TA = +25°C
TA = +85°C
MIN
2.5
1.8
0.54
2.10
TYP
0.865
50
2.15
70
0.01
0.01
0.25
0.25
0.35
0.35
0.02
0.02
MAX
5.5
3.6
UNITS
V
V
1.35 V
mV
2.20 V
mV
1
µA
1
µA
1
µA
1
µA
1.4
0.7 x VDD
0.4
0.3 x VDD
-1 0.01 +1
0.01
V
V
µA
2 _______________________________________________________________________________________


Part Number MAX8649
Description 1.8A Step-Down Regulator
Maker Maxim Integrated Products
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MAX8649 Datasheet PDF






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