The MAX1980 step-down slave controller is intended for low-voltage, high-current, multiphase DC-DC applications. The MAX1980 slave controller can be combined with any of Maxim's Quick-PWM™ step-down controllers to form a multiphase DC-DC converter. Existing Quick-PWM controllers, such as the MAX1718, function as the master controller, providing accurate output-voltage regulation, fast transient response, and fault protection features. Synchronized to the master's low-side gate driver, the MAX1980 includes the Quick-PWM constant on-time controller, gate drivers for a synchronous rectifier, active current balancing, and precision current-limit circuitry.
The MAX1980 provides the same high-efficiency, ultra-low duty factor capability, and excellent transient response as other Quick-PWM controllers. The MAX1980 differentially senses the inductor currents of both the master and the slave across current-sense resistors. These differential inputs and the adjustable current-limit threshold derived from an external reference allow the slave controller to accurately balance the inductor currents and provide precise current-limit protection. The MAX1980's dual-purpose current-limit input also allows the slave controller to automatically enter a low-power standby mode when the master controller shuts down.
The MAX1980 features a driver-disable mode that forces both gate drivers (DL and DH) low. While the MAX1980's drivers are disabled, the master controller can operate in low-power skip mode, improving light-load efficiency. Additionally, the MAX1980 includes selectable trigger polarity, allowing the slave controller to trigger on the rising (out-of-phase) or falling (in-phase) edge of the master's low-side gate driver. Out-of-phase operation staggers the master and slave's on-times, reducing the input ripple current and consequently the number of input capacitors. The MAX1980 also features a selectable 200kHz/300kHz/550kHz switching frequency. The MAX1980 is available in compact 20-pin 5mm x 5mm QFN and thin QFN packages.
Key Features
Applications/Uses
Quick-PWM Slave Controller
Precise, Active Current Balance (±1.25mV )
Driver Disable Improves Light Load Efficiency
Accurate, Adjustable Current-Limit Threshold
Optimized for Low-Output Voltages (≤ 2V)
4V to 28V Battery Input Range
Selectable 200kHz/300kHz/550kHz Switching Frequency
Drive Large Synchronous-Rectifier MOSFETs
525µA (typ) ICC Supply Current
20µA Standby Supply Current
Compact 20-Pin 5mm x 5mm QFN and Thin QFN Packages
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
1-6
of
6
MAX1980
Free Sample
Buy
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
MAX1980EGP
QFN;20 pin;26 mm²
Dwg: 21-0091J (PDF)
Use pkgcode/variation: G2055-2*
Download
E-Mail