ACT8309/8310/8311 Rev 1, 15-Nov-12 1.5A, PWM Step-Down DC/DCs in TDFN GENERAL DESCRIPTION FEATURES Multiple Patents Pending The patent-pending ACT8309/ACT8310/ACT8311 are current-mode, fixed-frequency PWM, synchro- Up to 95% High Efficiency nous step-down DC/DC converters that are capable Up to 1.5A Guaranteed Output Current (ACT8311) of delivering 1.5A with efficiency of up to 95%. 1.35MHz Constant Frequency Operation These devices operate with a fixed frequency of 1.35MHz, minimizing noise in sensitive equipment Internal Synchronous Rectifier Eliminates as well as optimizing both efficiency and component Schottky Diode size and cost. ACT8309: Up to 900mA These devices feature very low-resistance power ACT8310: Up to 1.2A MOSFET and 100% duty cycle operation, making ACT8311: Up to 1.5A them ideal choices for portable applications requir- 100% Duty Cycle Low-Dropout Operation ing a 3.0V or 3.3V rail to be generated from a Li+ battery. 0.1A Shutdown Current Small TDFN33-8 Package The ACT8311 is capable of supplying up to 1.5A of output current, while the ACT8309 and ACT8310 RoHS-Compliant are capable of supplying up to 900mA and 1.2A, Enable/Disable Control respectively. All three devices have adjustable out- Minimal External Components put voltages that are programmable down to 1.2V. Contact Active-Semi for custom fixed output voltage availability. APPLICATIONS Wireless Handhelds Portable Devices GPS/PND equipment SYSTEM BLOCK DIAGRAM V OUT SW 2.7V to 5.0V IN Up to 1.5A ACT8311 ON EN Pb-free OFF FB Power-OK POK Output GP G TM Innovative Power - 1 - www.active-semi.com Copyright 2012 Active-Semi, Inc. ACT8309/8310/8311 Rev 1, 15-Nov-12 ORDERING INFORMATION PART OUTPUT OUTPUT TEMPERATURE PACKAGE PINS NUMBER CURRENT VOLTAGE RANGE ACT8309NHADJ-T 0.9A Adjustable TDFN33-8 8 -40C to +85C 1.2V, 1.5V, 1.8V, ACT8309NHxyz-T 0.9A TDFN33-8 8 -40C to +85C c 2.5V, 3.0V, 3.3V ACT8310NHADJ-T 1.2A Adjustable TDFN33-8 8 -40C to +85C 1.2V, 1.5V, 1.8V, ACT8310NHxyz-T 1.2A TDFN33-8 8 -40C to +85C c 2.5V, 3.0V, 3.3V ACT8311NHADJ-T 1.5A Adjustable TDFN33-8 8 -40C to +85C 1.2V, 1.5V, 1.8V, ACT8311NHxyz-T 1.5A TDFN33-8 8 -40C to +85C c 2.5V, 3.0V, 3.3V c : Fixed output voltage options are available for production subject to minimum order quantities. Contact Active-Semi for more informa- tion regarding fixed output voltage options. PIN CONFIGURATION SW IN 1 8 GP EN 2 ACT8309 7 ACT8310 ACT8311 IN 3 6 POK G 4 5 FB TDFN33-8 PIN DESCRIPTIONS PIN NAME DESCRIPTION 1, 3 IN Power Input. Bypass to GP close to IC with a high quality ceramic capacitor. 2 GP Power Ground. Connect to G with a short trace. 4 G Analog Ground. Connect to GP with a short trace. Feedback Node. For fixed output voltage versions, connect this pin directly to the output. For 5 FB the adjustable output versions the voltage at this pin is regulated to 0.8V, connect to this pin to the center of the output feedback resistor divider for voltage setting. Open-Drain Power-OK Status Output. POK is an open-drain output which sinks current when 6 POK the output voltage is less than 95% of the normal value. When the IC is disabled, POK is high impedance. Enable Input. When higher than 1.4V, this pin turns the IC on. When lower than 0.4V, this pin 7 EN turn the IC off. 8 SW Switch Output. Connect this pin to the switching end of the inductor. TM Innovative Power - 2 - www.active-semi.com Copyright 2012 Active-Semi, Inc.