Diodes Incorporated AP68065xQ/AP68105xQ Synchronous Buck Converters
Diodes Inc. AP68065xQ/AP68105xQ Synchronous Buck Converters are AEC-Q100 qualified converters suitable for automotive applications requiring specific change control. The AP680650Q/AP680651Q and AP681050Q/AP681051Q are adjustable-switching-frequency, constant-on-time control DC-DC buck converters. These devices can adjust the switching frequency from 300kHz to 600kHz. The AP680652Q and AP680652Q can program the MODE while operating at a fixed 300kHz frequency. These Diodes Inc. devices fully integrate 530mΩ high-side and 220mΩ low-side power MOSFETs to provide highly efficient step-down DC-DC conversion. The converters are available in a standard Green SO-8EP package.
The AP68065xQ/AP68105xQ converters enable a continuous load current of up to 1A with up to 92% efficiency. The devices are easy to use, minimizing external component count through the adoption of Constant On-Time (COT) control to achieve fast transient response, easy loop stabilization, and low output voltage ripple. With high integration and minimal external component requirements, the Diodes Inc. AP68065XQ/AP68105XQ simplifies board layout and reduces space requirements, ideal for distributed power architecture.
Features
- Qualified for automotive applications
- AEC-Q100 qualified with the following results
- Device Temperature Grade 1 (-40°C to +125°C TA)
- Device HBM ESD Classification Level H1C
- Device CDM ESD Classification Level C3B
- Functional safety-capable ISO26262 – documentation available to aid functional safety system design
- 4.5V to 80V input voltage range
- Adjustable 1.2V to 50V output voltage range
- 1.2V ±1% Vref
- 0.6A and 1A continuous output current
- Adjustable switching frequency options
- Programmable MODE options
- Overcurrent Protection (OCP) with hiccup
- Thermal protection
- SO-8EP package
- Totally lead-free and fully RoHS-compliant
- Halogen-/antimony-free, Green device
- Suitable for automotive applications requiring specific change control - AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities
Applications
- General-purpose point-of-load DC/DC power conversion
- Automotive infotainment
- Battery power applications
- In-dash instrumentation
- Navigation systems
Specifications
- 4.48V maximum VCC undervoltage lockout threshold
- 220mV typical UVLO hysteresis
- 7.3V typical VCC regulator output voltage
- 30mA typical VCC internal LDO current limit
- 3.0µA typical shutdown supply current
- 250μA maximum quiescent supply current
- 530mΩ typical high-side switch on-resistance
- 220mΩ typical low-side switch on-resistance
- Typical HS MOSFET positive current limit from drain to source
- 1.7A for AP68065xQ variants
- 2.5A for AP68105xQ variants
- Typical LS MOSFET current limit
- 1.3A from drain to source
- 3.0A for AP680652Q/AP681052Q from drain to source
- 1.182V to 1.218V feedback voltage range
- 4ms typical soft-start period
- 100kHz to 600kHz frequency range using RT mode
- 270kHz to 330kHz switching frequency range
- 420ns typical on-time
- 200ns (typical) minimum off-time
- 1.23V typical EN rising threshold
- 10mV typical EN hysteresis
- Typical enable pin pull-up current
- 0.35µA at 1V
- 17.8µA at 1.5V
- 0.5V maximum PFM mode logic threshold
- 1.5V to 3.4V ultrasonic mode logic threshold range
- 4.65V minimum PWM mode logic threshold
- Typical feedback overvoltage with respect to the reference voltage
- 110% VFB/VREF rising
- 105% VFB/VREF falling
- +173°C typical thermal shutdown
- +25°C typical thermal hysteresis
- +150°C maximum junction temperature
- +300°C maximum lead temperature
- -40°C to +150°C operating junction temperature range
- ±1000V maximum ESD susceptibility (HBM and CDM)
- Thermal
- 39°C/W junction-to-ambient
- 13°C/W junction-to-case (top)
- 13°C/W junction-to-board (bottom)
- 4.5°C/W junction-to-top characterization parameter
- 12.5°C/W junction-to-board characterization parameter
- 3.5°C/W junction-to-case (bottom)
Typical Application Circuit
Functional Block Diagram
