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MAX17085B

Maxim Integrated Products
Part Number MAX17085B
Manufacturer Maxim Integrated Products
Description Integrated Charger Dual Main Step-Down Controllers and Dual LDO Regulators
Published Mar 18, 2010
Detailed Description 19-5135; Rev 0; 1/10 www.DataSheet4U.com TION KIT EVALUA BLE IL AVA A Integrated Charger, Dual Main Step-Down Control...
Datasheet PDF File MAX17085B PDF File

MAX17085B
MAX17085B


Overview
19-5135; Rev 0; 1/10 www.
DataSheet4U.
com TION KIT EVALUA BLE IL AVA A Integrated Charger, Dual Main Step-Down Controllers, and Dual LDO Regulators General Description The MAX17085B is an all-in-one notebook power solution integrating a multichemistry battery charger, dual fixedoutput Quick-PWMK step-down controllers, and dual keep-alive linear regulators: Charger: The high-frequency (~1.
4MHz) multichemistry 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.
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 amplifiers 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 charger provides a high-accuracy analog output that is proportional to the adapter current.
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.
Main SMPS: The dual Quick-PWM step-down controllers with synchronous rectification generate the 5V and 3.
3V main power in a notebook.
Lowside MOSFET sensing provides a simple low-cost, highly efficient valley current-limit protection.
The MAX17085B also includes output undervoltage, output overvoltage, and thermal-fault protection.
Separate enable inputs for each SMPS and a combined open-drain power-good output allow flexible 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 featur...


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