MAX17085BETL+

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> Semiconductors - ICs

> Power Management

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Series Information for MAX17085BETL+ - Maxim Integrated

Description

POWER MANAGEMENT UNIT 4 O/P TQFN-40
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: 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. 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. 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 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. 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. 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.

Specifications

Supply Voltage:
24V
No. of Step-Down DC - DC Converters:
2
No. of LDO Regulators:
2
No. of Regulated Outputs:
4
Digital IC Case:
TQFN
No. of Pins:
40Pins
Operating Temperature Min:
-40°C
Operating Temperature Max:
85°C
Product Range:
-
Automotive Qualification Standard:
-
RoHS Phthalates Compliant:
To Be Advised
MSL:
MSL 1 - Unlimited
SVHC:
No SVHC (15-Jan-2018)

Alternate Descriptions

Avnet America

Integrated Charger and Step-Down Controllers and Dual LDO Regulators 40-Pin TQFN EP

Avnet America product

Avnet Europe

Integrated Charger and Step-Down Controllers and Dual LDO Regulators 40-Pin TQFN EP

Avnet Europe product