The MAX77801 is a high-current, high-efficiency buck-
boost targeted to mobile applications that use a Li-ion bat-
tery or similar chemistries. The MAX77801 utilizes a four-
switch H-bridge configuration to support buck and boost
operating modes. Buck-boost provides 2.60V to 4.1875V
of output voltage range and up to 2A output current.
A unique control algorithm allows high efficiency, out-
standing performances in line/load transient response,
and seamless transition between buck and boost modes.
DVS (dynamic voltage scaling) input allows the host
processor to switch between two preprogrammed output
voltages. This feature minimizes power loss for given load
conditions. The ramp-up and ramp-down slew rates are
programmable through I
2
C.
The MAX77801 features I
2
C-compatible, 2-wire serial
interface consisting of a bidirectional serial-data line
(SDA) and a serial-clock line (SCL). It supports SCL clock
rates up to 3.4MHz.
Benefits and Features
●
2A High-Efficiency Buck and Boost Operation
Including Seamless Transition Between Buck
and Boost Mode
●
Flexibility Supports Various Designs
• V
OUT
Range from 2.60V to 4.1875V with 12.5mV Step
• High-Speed (Up to 3.4MHz) I
2
C Serial Interface
●
Low Quiescent Current, High Efficiency, and Dynamic
Voltage Scaling Enable System to Be More Efficient
• DVS Input
•
Up to 97% of Peak Efficiency
• 55µA Quiescent Current
●
High Switching Frequency and Small Package
Reduce Solution Size
• 2.5MHz Switching Frequency
• Available in WLP and TQFN Packages
●
Safety Features Enhance Device and System Reliability
• POK Output
• Soft-Start
• True Shutdown™
• Thermal Shutdown and Short-Circuit Protection
Applications
●
Smartphones and Tablets
●
Battery-Powered Applications
Typical Application Circuit
1µH
LXBB1
V
IN
10µF
1µF
INBB
V
SYS
LXBB2
OUTBB
FB_BB
PGNDBB
47µF
V
OUT
V
IO
1.5kΩ
POK
SDA
SCL
1.5kΩ
100kΩ
0.1µF
V
IO
MAX77801
POK
SDA
SCL
EN
DVS
GND
EN
DVS
Ordering Information
appears at end of data sheet.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
19-7515; Rev 3; 3/18
MAX77801
High-Efficiency Buck-Boost Regulator
Absolute Maximum Ratings
SYS, VIO to GND .................................................-0.3V to +6.0V
INBB, OUTBB to PGNDBB ..................................-0.3V to +6.0V
PGNDBB to GND .................................................-0.3V to +0.3V
SCL, SDA to GND ..................................... -0.3V to (VIO + 0.3V)
EN, DVS, POK to GND ..........................-0.3V to (VSYS + 0.3V)
FB_BB to GND ................................. -0.3V to (VOUTBB + 0.3V)
LXBB1 to PGNDBB .............................. -0.3V to (VINBB + 0.3V)
LXBB2 to PGNDBB .......................... -0.3V to (VOUTBB + 0.3V)
LXBB1/LXBB2 Continuous RMS Current (Note 1) ..............3.3A
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
Note 1:
LXBB1/LXBB2 node has internal clamp diodes to PGNDBB and INBB. Applications that give forward bias to these diodes
should ensure that the total power loss does not exceed the power dissipation limit of IC package.
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
As time goes by, people are increasingly concerned about their own and their families' health. However, existing monitoring devices for individual vital signs have struggled to gain market share du...[详细]
For healthcare professionals, accurate diagnosis and treatment are crucial for a clear picture of a person's health. However, healthcare professionals often rely on tests at medical facilities, cli...[详细]
据外媒报道,萨里大学(University of Surrey)的研究人员开发出一种无需依赖GPS即可在人口密集的城市地区精确定位设备位置的人工智能系统。该系统可将定位误差从734米缩小到22米以内,这对于自动驾驶汽车和救援车辆等技术的发展意义重大。 图片来源: 萨里大学 在发表于《IEEE Robotics and Automation Letters》的论文中,研究人员介绍了PEn...[详细]