The MAX77813 is a high-efficiency step-up/step-down
(buck-boost) converter targeted for single-cell Li+/Li-ion
battery powered applications. The device maintains a
regulated output voltage from 2.6V to 5.14V across an
input voltage range of 2.3V to 5.5V. The device supports
up to 2A of output current in boost mode and up to 3A in
buck mode.
The device seamlessly transitions between buck and
boost modes. A unique control algorithm allows high-
efficiency, outstanding load, and line transient response.
Dedicated enable and power-OK pins allow simple hard-
ware control. An I
2
C serial interface is optionally used for
dynamic voltage scaling, system power optimization, and
fault read-back. The device supports two inductor current
limit options selected by the ILIM pin.
The MAX77813 is available in a 20-bump, 1.83mm x
2.13mm wafer-level package (WLP).
Features and Benefits
●
V
IN
Range: 2.30V to 5.5V
●
V
OUT
Range: 2.60V to 5.14V
(I
2
C Programmable in 20mV Steps)
●
Up to 2A Output Current in Boost Mode
(V
IN
= 3.0V, V
OUT
= 3.4V, ILIM = High)
●
Up to 3A Output Current in Buck Mode (ILIM = High)
●
Up to 97% Peak Efficiency
●
SKIP Mode for Optimal Light Load Efficiency
●
55µA (Typ) Low Quiescent Current
●
3.4MHz High Speed I
2
C Serial Interface
●
Input Current Limit Selection Pin
●
Power-OK Output
●
2.5MHz Switching Frequency
●
Protection Features
• Soft-Start
• Thermal Shutdown
• Overvoltage Protection
• Overcurrent Protection
●
1.827mm x 2.127mm, 20-Bump WLP
Ordering Information
appears at end of data sheet.
Applications
●
Single-Cell Li+/Li-ion Battery Powered Devices
●
Handheld Scanners, Mobile Payment Terminals,
Security Cameras
●
AR/VR Headsets
Typical Application Circuit
1μH
LX1
DC INPUT
2.3V TO 5.5V
LX2
OUT
OUTS
PGND
47μF
V
OUT
2.6V TO 5.14V
2A (BOOST MODE)
3A (BUCK MODE)
BOOST TO BUCK
LINE TRANSIENT RESPONSE
I
OUT
= 1.5A
V
OUT
= 3.3V
V
IN
MAX77813
IN
10μF
1μF
V
SYS
3.4V
500mV/div
BUCK MODE
BOOST
MODE
2.9V
BOOST
MODE
SERIAL
HOST
ENABLE
V
IO
SDA
SCL
EN
POK
ILIM
POWER-OK
CURRENT LIMIT
SELECT
V
OUT
20mV/div
100µs/div
HIGH-EFFICIENCY BUCK-BOOST CONVERTER
WITH OPTIONAL I
2
C CONTROL IN TINY 20-BUMP WLP
19-8238; Rev 2; 3/19
MAX77813
5.5V Input, 2A, High-Efficiency
Buck-Boost Converter
Absolute Maximum Ratings
SYS, V
IO
to GND .................................................-0.3V to +6.0V
IN, OUT to PGND .................................................-0.3V to +6.0V
PGND to GND ......................................................-0.3V to +0.3V
SCL, SDA to GND ..................................... -0.3V to (V
IO
+ 0.3V)
EN, ILIM, POK to GND........................... -0.3V to (V
SYS
+ 0.3V)
FB to GND .............................................. -0.3V to (V
OUT
+ 0.3V)
LX1 to PGND..............................................-0.3V to (V
IN
+ 0.3V)
LX2 to PGND.......................................... -0.3V to (V
OUT
+ 0.3V)
LX1/LX2 Continuous RMS Current (Note 1) ........................3.2A
Operating Junction Temperature Range .......... -40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................ -65°C to +150°C
Soldering Temperature (Reflow)......................................+260°C
Note 1:
LX1 and LX2 nodes have internal clamp diodes to PGNDBB and INBB. Applications that forward bias to these diodes should
ensure that the total power loss does not exceed the power dissipation limit of the 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
device reliability.
Package Information
WLP
Package Code
Outline Number
Land Pattern Number
Thermal Resistance, Four-Layer Board:
Junction to Ambient Thermal Resistance (θ
JA
)
55.49°C/W
W201F2+1
21-0771
Refer to
Application Note 1891
For the latest package outline information and land patterns (footprints), go to
www.maximintegrated.com/packages.
Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
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.maximintegrated.com/thermal-tutorial.
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Maxim Integrated
│
2
MAX77813
5.5V Input, 2A, High-Efficiency
Buck-Boost Converter
Buck-Boost Electrical Characteristics
(V
SYS
= V
IN
= +3.8V, V
OUTS
= V
OUT
= +3.3V, T
J
= -40°C to +125°C, typical values are at T
A
≈ T
J
= +25°C, unless otherwise noted.)
(Note 4)
PARAMETER
GENERAL
Input Voltage Range
Shutdown Supply Current
V
IN
I
SHDN_25C
I
SHDN_125C
I
Q_SKIP
I
Q_PWM
Active Discharge Resistance
Thermal Shutdown Threshold
H-BRIDGE
Output Voltage Range
V
OUT
V
OUT_ACC1
V
OUT_ACC2
Line Regulation
Load Regulation
Line Transient Response
V
OS1
V
US1
V
OS2
V
US2
I
2
C programmable (20mV Step)
FPWM mode, VOUT[6:0] = 0x28, no load,
T
J
= +25°C
SKIP mode, VOUT[6:0] = 0x28,
no load, T
J
= +25°C
V
IN
= 2.63V to 5.5V
(Note 5)
I
OUT
= 1.0A, V
IN
changes from 3.4V to
2.9V in 25µs (20mV/µs),
L = 1µH, C
OUT_NOM
= 47µF (Note 5)
V
IN
= 3.4V, I
OUT
changes from 10mA to
1.5A in 15µs, L = 1µH, C
OUT_NOM
= 47µF
(Note 5)
BB_RU_SR = 0
BB_RU_SR = 1
BB_RD_SR = 0
BB_RD_SR = 1
η
TYP
η
PK
I
LIM_LX
R
DSON(PMOS)
R
DSON(NMOS)
f
SW
I
OUT
= 100mA (Note 5)
(Note 5)
ILIM = high
ILIM = low
I
LX
= 100mA per switch
I
LX
= 100mA per switch
PWM mode, T
J
= +25°C
2.25
3.70
1.2
2.60
-1.0
-1.0
0.200
0.125
50
5.14
+1.0
%
+4.5
%/V
%/A
mV
V
R
DISCHG
T
SHDN
Rising, +20°C hysteresis
EN = low, T
J
= +25°C
EN = low, T
J
= +125°C
SKIP mode, no switching,
T
J
= -40° to +85°C
FPWM mode, no load
2.30
0.1
1
55
6
100
+165
70
5.50
V
µA
µA
mA
Ω
°C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Supply Current
Output Voltage Accuracy
Load Transient Response
Output Voltage Ramp-Up
Slew Rate
Output Voltage Ramp-Down
Slew Rate
Typical Condition
Efficiency
Peak Efficiency
LX1/2 Current Limit
High-Side PMOS ON
Resistance
Low-Side NMOS ON
Resistance
Switching Frequency
50
20
40
5
10
95
97
4.50
1.80
40
55
2.50
2.75
5.70
2.65
mV
mV/µs
mV/µs
%
%
A
mΩ
mΩ
MHz
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Maxim Integrated
│
3
MAX77813
5.5V Input, 2A, High-Efficiency
Buck-Boost Converter
Buck-Boost Electrical Characteristics (continued)
(V
SYS
= V
IN
= +3.8V, V
OUTS
= V
OUT
= +3.3V, T
J
= -40°C to +125°C, typical values are at T
A
≈ T
J
= +25°C, unless otherwise noted.)
(Note 4)
PARAMETER
Turn-On Delay Time
Soft-Start Timer
Minimum Effective Output
Capacitance
SYMBOL
t
ON_DLY
t
SS
C
EFF(MIN)
I
LK_25C
I
LK_125C
POWER-OK COMPARATOR
Output POK Trip Level
V
SYS
UNDERVOLTAGE LOCKOUT
V
SYS
Undervoltage Lockout
Threshold
LOGIC AND CONTROL INPUTS
Input Low Level
Input High Level
POK Output Low Voltage
POK Output High Leakage
V
IL
V
IH
V
OL
I
OZH_25C
I
OZH_125C
R
PD
EN, ILIM, V
SYS
= 3.8V, T
J
= +125°C
EN, ILIM, V
SYS
= 3.8V, T
J
= -40°C
I
SINK
= 1mA
T
J
= +25°C
T
J
= +125°C
Pulldown resistance to GND
400
-1
0.1
800
1600
1.2
0.4
+1
0.4
V
V
V
µA
V
UVLO_R
V
UVLO_F
V
SYS
rising
V
SYS
falling
2.375
2.50
2.05
2.625
V
Rising threshold
Falling threshold
80
75
%
CONDITIONS
From EN asserting to LX switching with
bias ON
I
OUT
= 10mA, ILIM = high
I
OUT
= 10mA, ILIM = low
0A < I
OUT
< 2000mA
V
LX1/2
= 0V or 5.5V, V
OUT
= 5.5V,
V
SYS
= V
IN
= 5.5V, T
J
= +25°C
V
LX1/2
= 0V or 5.5V, V
OUT
= 5.5V,
V
SYS
= V
IN
= 5.5V, T
J
= +125°C
MIN
TYP
100
120
800
16
0.1
0.2
1
µA
MAX
UNITS
µs
µs
µF
LX1, LX2 Leakage Current
INTERNAL PULLDOWN RESISTANCE
EN
kΩ
Note 2:
Limits are 100% production tested at T
J
= +25°C. The device is tested under pulsed load conditions such that T
J
≈ T
A.
Limits over the operating temperature range are guaranteed through correlation using statistical quality control methods.
Note 3:
Guaranteed by design. Not production tested.
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Maxim Integrated
│
4
MAX77813
5.5V Input, 2A, High-Efficiency
Buck-Boost Converter
I
2
C Electrical Characteristics
(V
SYS
= 3.8V, V
VIO
= 1.8V, T
J
= -40°C to +125°C, typical values are at T
A
≈ T
J
= +25°C, unless otherwise noted.) (Note 4)
PARAMETER
POWER SUPPLY
V
IO
Voltage Range
SDA AND SCL I/O STAGES
SCL, SDA Input High Voltage
SCL, SDA Input Low Voltage
SCL, SDA Input Hysteresis
SCL, SDA Input Current
SDA Output Low Voltage
SCL, SDA Input Capacitance
Output Fall Time from V
VIO
to
0.3 x V
VIO
Clock Frequency
Hold Time (REPEATED)
START Condition
SCL Low Period
SCL High Period
Setup Time REPEATED
START Condition
DATA Hold Time
DATA Setup Time
Setup Time for STOP
Condition
Bus-Free Time Between
STOP and START
Capacitive Load for Each
Bus Line
Maximum Pulse Width
of Spikes that must be
suppressed by the input filter
V
IH
V
IL
V
HYS
I
I
V
OL
C
I
t
OF
V
VIO
= 3.8V
I
SINK
= 20mA
10
120
-10
0.05 x
V
IO
+10
0.4
0.7 x
V
IO
0.3 x
V
IO
V
V
V
µA
V
pF
ns
V
VIO
1.7
3.6
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
2
C-COMPATIBLE INTERFACE TIMING (STANDARD, FAST, AND FAST-MODE PLUS) (Note 5)
