MAX14745BEWX+T [MAXIM]

Power Supply Management Circuit,;


型号：	MAX14745BEWX+T
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Power Supply Management Circuit,
文件：	总3页 (文件大小：693K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ABRIDGED DATA SHEET

MAX14745

Wearable Charge-Management Solution

General Description

Beneﬁts and Features

● Extend System Use Time Between Battery Charging

The MAX14745 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

MAX14745 features two ultra-low quiescent current buck

regulators and three ultra-low quiescent current low-dropout

(LDO) linear regulators, providing up to five regulated

voltages, each with an ultra-low quiescent current, allows

designers to minimize power consumption and extend

battery life in 24/7 operation devices, such as those in the

wearable market.

• Dual Ultra-Low-I 200mA Buck Regulators

- Output Programmable from 0.8V to 2.375V and

0.8V to 3.95V

- 0.9μA (typ) Quiescent Current (Buck 1)

- Optional Fixed Peak-Current Mode to Optimize

Ripple Frequency in Noise-Sensitive Applications

• Three Ultra-Low-I 100mA LDOs

• LDO1

- Output Programmable from 0.8V to 3.6V

- 0.6μA (typ) Quiescent Current

- 2.7V to 5.5V Input with Dedicated Pin

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

• LDO2/3

- Output Programmable from 0.9V to 4V

- 1μA (typ) Quiescent Current

- 1.71V to 5.5V Input with Dedicated Pin

on an I C 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 charger also supports

temperature dependent charge currents.

● Easy-to-Implement Li+ Battery Charging

• Smart Power Selector

• 28V/-5.5V Tolerant Input

• Thermistor Monitor

The two synchronous, high-efficiency step-down buck

regulators feature a variable frequency mode for increased

efficiency during light-load operation. The output voltage

● Minimize Solution Footprint Through High Integration

• Provides Five Regulated Voltage Rails

• Switch Mode Option on Each LDO

of these regulators can be programmed through I C

with the default preconfigured. The buck regulators can

support dynamic voltage scaling to further improve

system power consumption.

● Optimize System Control

• Monitors Pushbutton for Ultra-Low Power Mode

• Power-On Reset Delay and Voltage Sequencing

• On-Chip Voltage Monitor Multiplexer

The three configurable LDOs each have a dedicated

input pin. Each LDO regulator output voltage can be

Applications

● Wearable Electronics

● Fitness Monitors

● Rechargeable IoT devices

programmed through I C 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.

The MAX14745 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.

Ordering Information appears at end of data sheet.

The MAX14745 is available in a 36-bump, 0.4mm pitch,

2.72mm x 2.47mm wafer-level package (WLP).

19-8560; Rev 0; 6/16

ABRIDGED DATA SHEET

MAX14745

Wearable Charge-Management Solution

Typical Application Circuit

MAX14745

CAP

THM

BAT

SET

Li+ BATTERY

CHARGER WITH

SMART POWER

SELECTOR

CHGIN

GND

1µF

EXT

SYS

VIO

VSYS

VB1

10µF

(*)

SCL

SDA

INT

SCL

SDA

B1OUT

B1LX

2.2µH

BUCK 1

INT

VB2

MPC0

B2OUT

B2LX

CONTROL

MPC1

PFN2

RST

BUCK 2

10µF

1µF

2.2µH

VSYS

MPC1

PFN2

RST

L1IN

LDO/

PFN1

VL1

SWITCH 1

L1OUT

VSYS

LED

VSYS

L2IN

LDO/

VL2

VL3

1µF

SWITCH 2

L2OUT

MON

MUX/

DIVIDER

MON

L3IN

LDO/

SWITCH 3

L3OUT

* OPTIONAL EXTERNAL FET

Maxim Integrated

│ 2

www.maximintegrated.com

ABRIDGED DATA SHEET

MAX14745

Wearable Charge-Management Solution

Ordering Information

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.

PART

TEMP RANGE

PIN-PACKAGE

36 WLP

MAX14745AEWX+

MAX14745AEWX+T

MAX14745BEWX+*

MAX14745BEWX+T*

-40°C to +85°C

36 WLP

PACKAGE

TYPE

PACKAGE

CODE

OUTLINE

NO.

LAND

PATTERN NO.

36 WLP

+Denotes a lead(Pb)-free package/RoHS-compliant package.

T = Tape and reel.

*Future product—contact marketing for availability

See Table 38 and Table 39 for the device differences.

Refer to

Application

Note 1891

36 WLP

W362D2+1

21-0897

Chip Information

PROCESS: BiCMOS

Maxim Integrated

│ 59

www.maximintegrated.com

MAX14745BEWX+T [MAXIM]

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