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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX20345 Datasheet

PMIC

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MAX20345
PMIC with Ultra-Low IQ Voltage Regulators,
Buck-Boost for Optical Sensing and
Charger for Small Lithium Ion Systems
General Description
The MAX20345 is a power management solution featur-
ing ultra-low IQ voltage regulators, ideal for low-power
wearable applications. The device includes a linear battery
charger with a smart power selector and several power-
optimized peripherals. The device features three buck
regulators, three low-dropout (LDO) linear regulators, and
a Buck-Boost regulator, providing up to seven regulated
voltages, each with an ultra-low quiescent current. Two
load switches allow disconnecting system peripherals to
minimize the total quiescent load of the system. MAX20345
allows system designers to minimize power consumption
and extend battery life in 24/7 operation devices, such as
those in the wearable market.
The three synchronous, high-efficiency buck regulators
use a pulse frequency modulated (PFM) control scheme
for increased efficiency during light-load operation. The
output voltage of these regulators can be programmed
through I2C down to voltages as low as 0.7V. Additionally,
the buck regulators support dynamic voltage scaling
(DVS) allowing the system designer to further improve
system power consumption when using devices that can
take advantage of DVS.
Each of the three LDO regulators output voltage can be
programmed through I2C. For additional flexibility, each
LDO can be configured as a load switch that can be used
to disconnect the quiescent load of the system peripherals.
The integrated Buck-Boost converter provides a conve-
nient way to power system peripherals that require volt-
ages higher and/or lower than the battery voltage, and
is optimized for optical sensing systems such as optical
heart rate (OHR)/PPG and SpO2 measurements. The
output noise of the Buck-Boost is minimized to provide
the least impact possible on sensitive measurements in
such systems. The addition of DVS offers further power
savings during favorable measurement conditions.
The MAX20345 also features a programmable power con-
troller that allows the device to be configured for applications
that require the device be in a true-off, or always-on, state.
The controller provides a delayed reset signal and voltage
sequencing. The MAX20345 is available in a 56-bump,
0.4mm pitch, 3.37mm x 3.05mm wafer-level package (WLP).
Applications
● Wearable Devices
● IoT
Ordering Information appears at end of data sheet.
Benefits and Features
● Extend Battery-Use Time Between Charging
• 3 x Low IQ Buck Regulators (IQ = 0.9µA typ)
• 220mA Output Current
• Noise Mitigation by Flexible Adjustment of
Switching Frequency
• Buck1: 0.700V to 1.330V Output Voltage in
10mV Steps
• Buck2: 0.700V to 2.275V Output Voltage in
25mV Steps
• Buck3: 0.700V to 3.850V Output Voltage in
50mV Steps
• LDO1 (IQ = 0.55µA typ)
• 100mA Output
• 2.7V to 5.5V Input Voltage Range
• 0.8V to 3.6V Output Voltage in 100mV Steps
• LDO2 (IQ = 1µA typ)
• 100mA Output
• 1.71V to 5.50V Input Voltage Range
• 0.9V to 4.0V Output Voltage in 100mV Steps
• LDO3 (IQ = 1µA typ)
• 50mA Output
• 1.00V to 2.00V Input Voltage Range
• 0.50V to 1.95V Output Voltage in 25mV Steps
• 2 x Load Switches
• 0.65V to 5.50V Input Voltage Range
1Ω RON at SYS = 3.0V
• Low IQ Buck-Boost Regulator (IQ = 2µA typ)
• 1.5W Output Capability
• 2.6V to 5.5V Output Voltage in 50mV Steps
● Easy to Implement Li+ Battery Charging
• Linear Li-Ion Battery Charger
• 5mA to 500mA Charge current
• +28V / -5.5V Tolerant Input
• Step Charging (See the Step Charging Section)
• Thermistor Monitor
• Smart Power Selector
● Optimize System Control
• Power On/ Reset Controller
• Push-Button Monitor
• Factory Shipping Mode
• System Interface
• Monitor Multiplexer with Programmable Divider to
Monitor System Voltages and Charging Current
19-100366; Rev 3; 2/20


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX20345 Datasheet

PMIC

No Preview Available !

MAX20345
Functional Diagram
PMIC with Ultra-Low IQ Voltage Regulators,
Buck-Boost for Optical Sensing and
Charger for Small Lithium Ion Systems
1µF
VIO
SCL
SDA
INT
RST
MPC
MPC
MPC
MPC
GPIO
ADC
VBBOUT
8.8µF
2.2µH
ISET
CHGIN
Li+ BATTERY CHARGER
WITH SMART POWER
SELECTOR
CAP
TPUEXT
TPU
THM
BAT
1µF
SCL
SDA
INT
RST
MPC0
MPC1
MPC2
MPC3
PFN2
PFN1
CONTROL
IVMON
MUX
DIVIDER
BBLVLX
BBHVLX
BBOUT
BUCK-
BOOST
SYS
BUCK1
BK1LX
BK1OUT
BUCK2
BK2LX
BK2OUT
BUCK3
BK3LX
BK3OUT
LDO1
L1IN
L1OUT
LDO2
L2IN
L2OUT
LDO3
L3IN
L3OUT
SW1IN
SW1 SW1OUT
SW2IN
SW2 SW2OUT
VSYS
10µF
2.2µH VBK1OUT
10µF
2.2µH VBK2OUT
10µF
2.2µH VBK3OUT
VL1IN
10µF
VL1OUT
VL2IN
1µF
VL2OUT
VL3IN
1µF
VL3OUT
VSW1IN
1µF
VSW1OUT
VSW2IN
VSW2OUT
1µF
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX20345
Description PMIC
Maker Maxim Integrated
PDF Download

MAX20345 Datasheet PDF






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