Maxim MAX14690AEWX+ Wearable charge-management solution Datasheet

ABRIDGED DATA SHEET
MAX14690
Wearable Charge-Management Solution
General Description
The MAX14690 is a battery-charge-management solution
ideal for low-power wearable applications. The device
includes a linear battery charger with a smart power
selector and several power-optimized peripherals. The
MAX14690 features two ultra-low-power buck regulators
with a typical quiescent current of 900nA. In addition,
three ultra-low power low-dropout (LDO) linear regulators,
with a typical quiescent current of 600nA are included.
In total, the MAX14690 can provide up to five regulated
voltages, each with an ultra-low quiescent current,
critical to battery life for the unique power profile in 24/7
operation devices, such as those in the wearable market.
The battery charger features a smart power selector that
allows operation on a dead battery when connected to a
power source. To avoid overloading a power adapter, the
input current to the smart power selector is limited based
on an I2C register setting. If the charger power source
is unable to supply the entire system load, the smart
power control circuit supplements the system load with
current from the battery.
The two synchronous, high-efficiency step-down buck
regulators feature a fixed-frequency PWM mode for
tighter regulation and a burst mode for increased
efficiency during light-load operation. The output voltage
of these regulators can be programmed through I2C with
the default preconfigured.
The three configurable LDOs each have a dedicated
input pin. Each LDO regulator output voltage can be
programmed through I2C with the default preconfigured.
The linear regulators can also be configured to operate
as power switches that may be used to disconnect the
quiescent load of the system peripherals.
Benefits and Features
●● Extend System Use Time Between Battery Charging
• Dual Ultra-Low-IQ 200mA Buck Regulators
-- Output Programmable from 0.8V to 1.8V and
1.5V to 3.3V
-- 0.9μA (typ) Quiescent Current
-- Automatic Burst or Forced-PWM Modes
• Three Ultra-Low-IQ 100mA LDOs
-- Output Programmable from 0.8V to 3.6V
-- 0.6μA (typ) Quiescent Current
-- 2.7V to 5.5V Input with Dedicated Pin
●● Easy-to-Implement Li+ Battery Charging
• Smart Power Selector
• 28V/-5.5V Tolerant Input
• Thermistor Monitor
●● Minimize Solution Footprint Through High Integration
• Provides Five Regulated Voltage Rails
• Switch Mode Option on Each LDO
●● Optimize System Control
• Monitors Pushbutton for Ultra-Low Power Mode
• Power-On Reset Delay and Voltage Sequencing
• On-Chip Voltage Monitor Multiplexer
Applications
●● Wearable Electronics
●● Fitness Monitors
●● Portable Medical Devices
Block Diagram
MAX14690
POWER
The MAX14690 features a programmable power controller
that allows the device to be configured for applications
that require the device be in a true-off, or always-on,
state. The controller also provides a delayed reset signal
and voltage sequencing.
The MAX14690 is available in a 36-bump, 0.4mm pitch,
2.72mm x 2.47mm wafer-level package (WLP).
28V INPUT
PROTECTION
LINEAR
Li+ BATTERY CHARGER
WITH POWER SELECTOR
POWER
SEQUENCER
BUCK 1
MONITOR
BUCK 2
LDO/SWITCH 1
DATA
CONTROL
LDO/SWITCH 2
SYS
Ordering Information appears at end of data sheet.
19-7480; Rev 10; 4/16
LDO/SWITCH 3
ABRIDGED DATA SHEET
MAX14690
Wearable Charge-Management Solution
Typical Application Circuit
MAX14690
SET
CHGIN
1µF
GND
CAP
Li+ BATTERY
CHARGER WITH
SMART POWER
SELECTOR
THM
BAT
1µF
1µF
EXT
VIO
SYS
VSYS 10µF
(*)
SCL
SCL
SDA
BUCK 1
INT
INT
MPC0
MPC0
MPC1
MPC1
PFN2
RST
CONTROL
BUCK 2
PFN2
RST
LDO/
SWITCH 1
PFN1
VSYS
B1LX
MON
MUX/
DIVIDER
LDO/
SWITCH 3
2.2µH
B2LX
L1IN
2.2µH
L3OUT
VL1
1µF
VL2
1µF
VL3
1µF
VSYS
L2OUT
L3IN
10µF
VSYS
L1OUT
L2IN
10µF
VB2
B2OUT
LED
LDO/
SWITCH 2
MON
VB1
B1OUT
SDA
VSYS
* OPTIONAL EXTERNAL FET
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ABRIDGED DATA SHEET
MAX14690
Wearable Charge-Management Solution
Ordering Information
PART
Chip Information
TEMP RANGE
PIN-PACKAGE
MAX14690AEWX+
-40°C to +85°C
36 WLP
MAX14690AEWX+T
-40°C to +85°C
36 WLP
MAX14690BEWX+
-40°C to +85°C
36 WLP
MAX14690BEWX+T
-40°C to +85°C
36 WLP
MAX14690CEWX+
-40°C to +85°C
36 WLP
MAX14690CEWX+T
-40°C to +85°C
36 WLP
MAX14690DEWX+
-40°C to +85°C
36 WLP
MAX14690DEWX+T
-40°C to +85°C
36 WLP
MAX14690EEWX+*
-40°C to +85°C
36 WLP
MAX14690EEWX+T*
-40°C to +85°C
36 WLP
MAX14690HEWX+
-40°C to +85°C
36 WLP
MAX14690HEWX+T
-40°C to +85°C
36 WLP
MAX14690IEWX+
-40°C to +85°C
36 WLP
MAX14690IEWX+T
-40°C to +85°C
36 WLP
MAX14690JEWX+
-40°C to +85°C
36 WLP
MAX14690JEWX+T
-40°C to +85°C
36 WLP
MAX14690NEWX+
-40°C to +85°C
36 WLP
MAX14690NEWX+T
-40°C to +85°C
36 WLP
PROCESS: BiCMOS
Package Information
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
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
36 WLP
W362D2+1
21-0897
Refer to
Application
Note 1891
+Denotes a lead(Pb)-free package/RoHS-compliant package.
T = Tape and reel.
*Future Product—contact marketing for availability.
See Table 35 and Table 36 for the device differences.
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Maxim Integrated │ 45
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