MAX17085BETL+ by Analog Devices

Integrated Charger, Dual Main Step-Down Controllers, and Dual LDO Regulators

Status: Active
Series: MAX17085B
RoHS: Unknown
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The MAX17085B is an all-in-one notebook power solution integrating a multichemistry battery charger, dual fixed output Quick-PWM™ 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. Low-side 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 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, minimizing 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.

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Prices starting from US$6.10

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Features

All-in-One Charger Plus Dual Main Step-Down Controllers
5V/100mA and 3.3V/50mA LDO Regulators
Main 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
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
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 ±0.4% Accurate Charge Voltage ±2.5% Accurate Input Current Limiting ±3% Accurate Charge Current
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
±0.4% Accurate Charge Voltage
±2.5% Accurate Input Current Limiting
±3% Accurate Charge Current
Monitor Outputs for AC Adapter Current (±2% Accuracy) Battery Discharge Current (±2% Accuracy) AC Adapter OK
AC Adapter Current (±2% Accuracy)
Battery Discharge Current (±2% Accuracy)
AC Adapter OK
Analog/PWM (100Hz to 500kHz) Adjustable Charge Current Setting
AC Adapter Overvoltage and Overcurrent Protection

Specifications

VIN (V) (min) 4.5
VIN (V) (max) 24
# Step-Down Outputs 2
# LDO Outputs 2
Battery Charger Features Battery ChargerInput Current LimitSmart Pwr. Selector
VOUT (V) (min) 3.3
VOUT (V) (max) 5
Package/Pins TQFN/40
BudgetaryPrice (See Notes) 4.21

MAX17085BETL+ Semiconductors - ICs by Analog Devices

POWER MANAGEMENT UNIT 4 O/P TQFN-40

Electronic & Electrical Components>Semiconductors - ICs>Power Management
Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock
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)

Alternative Descriptions

Integrated Charger, Dual Main | Analog Devices
POWER MANAGEMENT UNIT, 4 O/P, TQFN-40 | Farnell

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