Features and Benefits
- No Current-Sense Resistor Needed (MAX8734A)
- Accurate Current Sense with Current-Sense Resistor (MAX8732A/MAX8733A)
- 1.5% Output Voltage Accuracy
- 3.3V and 5V 100mA Bootstrapped Linear Regulators
- Internal Soft-Start and Soft-Stop Output Discharge
- Quick-PWM with 100ns Load Step Response
- 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™)
- 4.5V to 24V Input Voltage Range
- Enhanced Ultrasonic Pulse-Skipping Mode (25kHz min)
- Power-Good (PGOOD) Signal
- Overvoltage Protection Enable/Disable
The MAX8732A/MAX8733A/MAX8734A dual step-down, switch-mode power-supply (SMPS) controllers generate logic-supply voltages in battery-powered systems. The MAX8732A/MAX8733A/MAX8734A include two pulse-width modulation (PWM) controllers, adjustable from 2V to 5.5V or fixed at 5V and 3.3V. These devices feature two linear regulators providing 5V and 3.3V always-on outputs. Each linear regulator provides up to 100mA output current with automatic linear-regulator bootstrapping to the main SMPS outputs. The MAX8732A/MAX8733A/MAX8734A include on-board power-up sequencing, a power-good (PGOOD) output, digital soft-start, and internal soft-stop output discharge that prevents negative voltages on shutdown. Additionally, the outputs are high impedance when VCC falls below its UVLO set point while the outputs are enabled.
Maxim's proprietary Quick-PWM™ quick-response, constant on-time PWM control scheme operates without sense resistors and provides 100ns response to load transients while maintaining a relatively constant switching frequency. The unique ultrasonic pulse-skipping mode maintains the switching frequency above 25kHz, which eliminates noise in audio applications. Other features include pulse skipping, which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive applications.
The MAX8732A features a 200kHz/5V and 300kHz/3.3V SMPS for highest efficiency, while the MAX8733A features a 400kHz/5V and 500kHz/3.3V SMPS for "thin and light" applications. The MAX8734A provides a pin-selectable switching frequency, allowing either 200kHz/300kHz or 400kHz/500kHz operation of the 5V/3.3V SMPSs, respectively. The MAX8732A/MAX8733A/MAX8734A are available in 28-pin QSOP packages and operate over the extended temperature range (-40°C to +85°C).
The MAX8732A/MAX8733A/MAX8734A are pin-for-pin upgrades to the MAX1777/MAX1977/MAX1999. The MAX1999 evaluation kit (EV kit) can be used to evaluate the MAX8732A/MAX8733A/MAX8734A.
- 3- and 4-Cell Li+ Battery-Powered Devices
- Notebook and Subnotebook Computers
- PDAs and Mobile Communication Devices
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
MAX8734A Reliability Data1/12/2023
MAX8734A Companion Parts
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|MAX8734AEEI+||Material Declaration||Reliability Data||28-QSOP-150_MIL|
|MAX8734AEEI+T||Material Declaration||Reliability Data||28-QSOP-150_MIL|
|Wafer Fabrication Data||MAX8734A Reliability Data|
Sample & Buy
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