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MAX17085B

更新时间： 2024-11-24 07:17:23

品牌	Logo	应用领域
美信 - MAXIM		稳压器控制器
页数	文件大小	规格书
38页	3407K
描述
Integrated Charger, Dual Main Step-Down Controllers, and Dual LDO Regulators

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MAX17085B 数据手册

19-5135; Rev 2; 3/12

Integrated Charger, Dual Main Step-Down

Controllers, and Dual LDO Regulators

General Description

Features

S All-in-One Charger Plus Dual Main Step-Down

The MAX17085B is an all-in-one notebook power solution

integrating a multichemistry battery charger, dual fixed-

output Quick-PWMK step-down controllers, and dual

keep-alive linear regulators:

Controllers

S 5V/100mA and 3.3V/50mA LDO Regulators

S Main

Charger: The high-frequency (~1.4MHz) multichem-

istry battery charger uses a current-mode, fixed

inductor current ripple architecture that significantly

reduces component size and cost. Low-offset sense

amplifiers allow the use of low-value sense resistors

for charging and input current limit.

Dual Quick-PWM with Fast Transient Response

and Extended On-Time

300kHz to 800kHz Switching Frequency

Fixed 5V and 3.3V SMPS Outputs

Low-Noise Ultrasonic Mode

Autoretry Fault Protection

The charger uses n-channel switching MOSFETs.

Adjustable charge current, charge voltage, and cell

selection allow for flexible use with different battery

packs. Charge current is set by an analog control input,

or a PWM input. High-accuracy current-sense ampli-

fiers provide fast cycle-by-cycle current-mode control to

protect against short circuits to the battery and respond

quickly to system load transients. Additionally, the char-

ger provides a high-accuracy analog output that is pro-

portional to the adapter current.

S Charger

High Switching Frequency (1.4MHz)

Selectable 2-, 3-, and 4-Cell Battery Voltage

Automatic Selection of System Power Source

Internal Charge-Pump for Adapter n-Channel

MOSFETs Drive

Q0.4% Accurate Charge Voltage

Q2.5% Accurate Input Current Limiting

Q3% Accurate Charge Current

S Monitor Outputs for

An integrated charge pump controls an n-channel

adapter selector switch. The charge pump remains

active even when the charger is off. When the adapter

is absent, a p-channel MOSFET selects the battery.

AC Adapter Current (Q2% Accuracy)

Battery Discharge Current (Q2% Accuracy)

AC Adapter OK

S Analog/PWM (100Hz to 500kHz) Adjustable

Main SMPS: The dual Quick-PWM step-down con-

trollers with synchronous rectification generate

the 5V and 3.3V main power in a notebook. Low-

side MOSFET sensing provides a simple low-cost,

highly efficient valley current-limit protection. The

MAX17085B also includes output undervoltage, out-

put overvoltage, and thermal-fault protection.

Charge Current Setting

S AC Adapter Overvoltage and Overcurrent

Protection

Applications

Notebook Computers

PDAs and Mobile Communicators

5V and 3.3V Supplies

Separate enable inputs for each SMPS and a com-

bined open-drain power-good output allow flex-

ible power sequencing. Voltage soft-start reduces

inrush current, while passive shutdown discharges

the output through an internal switch. Fast transient

response, with an extended on-time feature reduces

output capacitance requirements. Selectable pulse-

skipping mode and ultrasonic mode improve light-

load efficiency. Ultrasonic mode operation maintains

a minimum switching frequency at light loads, mini-

mizing audible noise effects.

2-to-4, Li+-Cell, Battery-Powered Devices

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX17085BETL+

-40°C to +85°C

40 TQFN-EP*

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

*EP = Exposed pad.

Dual LDO Regulators: An internal 5V/100mA LDO5 with

switchover can be used to either generate the 5V bias

needed for power-up or other lower power “always-on”

suspend supplies. Another 3.3V/50mA LDO3 provides

“always-on” power to a system microcontroller.

Pin Configuration appears at end of data sheet.

Quick-PWM is a trademark of Maxim Integrated Products, Inc.

_______________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...38

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与MAX17085B相关器件

型号	品牌	获取价格	描述	数据表
MAX17085B_12	MAXIM	获取价格	Integrated Charger, Dual Main Step-Down Controllers, and Dual LDO Regulators
MAX17085BETL	MAXIM	获取价格	Integrated Charger, Dual Main Step-Down Controllers, and Dual LDO Regulators
MAX17085BETL+	MAXIM	获取价格	Integrated Charger, Dual Main Step-Down Controllers, and Dual LDO Regulators
MAX17085BETL+T	MAXIM	获取价格	Switching Regulator, Current-mode, 800kHz Switching Freq-Max, BICMOS, TQFN-40
MAX17085GTL	MAXIM	获取价格	Integrated Charger, Dual Main Step-Down Controllers, and Dual LDO Regulators
MAX17088	MAXIM	获取价格	35V to -25V High-Voltage Level-Shifting Drivers
MAX17088ETX+	MAXIM	获取价格	Switching Regulator
MAX17088EVCMAXQU+	MAXIM	获取价格	35V to -25V High-Voltage Level-Shifting Drivers
MAX17088EVKIT	MAXIM	获取价格	35V to -25V High-Voltage Level-Shifting Drivers
MAX17088EVKIT+	MAXIM	获取价格	35V to -25V High-Voltage Level-Shifting Drivers

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