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MAX77827
5.5V Input, 1.8A/3.1A Switch Buck-Boost
Converter with 6μA I
Q
General Description
Benefits and Features
The MAX77827 is a high-efficiency buck-boost regulator
targeted for one-cell Li-ion powered applications with the
lowest typical quiescent current in the industry of 6μA. It
supports input voltages of 1.8V to 5.5V and an output volt-
age range of 2.3V to 5.3V. The IC provides two different
switching current levels (1.8A and 3.1A) to optimize ex-
ternal component sizing based on given load current re-
quirements. With the 1.8A switching current-limit option,
the IC can support up to 1.0A load current in buck mode
● 1.8V to 5.5V Input Voltage Range
● 2.3V to 5.3V Single Resistor Adjustable Output
Voltage
● 1.6A Maximum Output Current (3.1A I
Buck Mode)
Option,
LIM
● 900mA Maximum Output Current (1.8A I
Option,
LIM
Boost Mode 3.0V , 3.3V
)
IN
OUT
● 96% Peak Efficiency (3.3V , 3.3V
)
OUT
IN
● SKIP Mode for Higher Light-Load Efficiency
and 900mA in boost mode (V = 3.0V, V
= 3.3V).
● 6μA Ultra-Low Typical Quiescent Current (At T =
IN
OUT
J
+25°C)
The peak efficiency of 96% makes the IC one of the best
solutions as a DC/DC converter to supply a rail for battery-
powered portable applications.
● 2.5MHz Nominal Switching Frequency
● Enable Pin
● GPIO Pins for System Design Convenience
• FPWM (Forced PWM) Mode Selection Pin
• POK Indicator Pin
The IC features an adjustable output voltage, which can
be programmed from 2.3V to 5.3V through a single resis-
tor. Two GPIO pins are available to support force PWM
enable function and power-OK (POK) indicator. A unique
control algorithm allows high-efficiency, outstanding line/
load transient response, and seamless transition between
buck and boost modes. These options provide design flex-
ibility that allow the IC to cover a wide range of applica-
tions and use cases while minimizing board space.
● UVLO, Soft-Start, Active-Output Discharge,
Overcurrent, and Thermal Shutdown Protections
● 1.61mm x 2.01mm, 12-Bump WLP
● 2.5mm x 2.5mm, 14-Lead FC2QFN
Ordering Information appears at end of data sheet.
The MAX77827 is available in a 1.61mm x 2.01mm,
12-bump wafer-level package (WLP), and a 2.5mm x
2.5mm, 14-lead FC2QFN package.
Applications
● 1-Cell Li+ Battery Powered Equipment
● Smartphones/Portable/Wearables
● Internet of Things (IoT) Devices
● LPWAN (LTE/NB-IoT, LTE/Cat-M1)
Simplified Block Diagram
L
1μH
2
14.52mm SOLUTION SIZE
1.8V TO 5.5V
DC SOURCE
LX1
LX2
IN
OUT
V
OUT
C
22μF
C
10μF
OUT
IN
2.3V TO 5.3V
MAX77827
OUTS
FPWM
POK
FPWM ENABLE
POWER-OK
ENABLE
EN
L
2012
BIAS
SEL
C
BIAS
4.00mm
1μF
*
AGND
PGND
R
SEL
*CHOOSE R
VALUE BASED ON VOUT, SEE TABLE 2
SEL
19-100546; Rev 5; 8/21