Micro PMU with 1.2 A Buck Regulator and Two 300 mA LDOs
The ADP5040 combines one high performance buck regulator and two low dropout regulators (LDO) in a small 20-lead LFCSP to meet demanding performance and board space requirements.
The high switching frequency of the buck regulator enables the use of tiny multilayer external components and minimizes board space.
When the MODE pin is set to logic high, the buck regulator operates in forced pulse width modulation (PWM) mode. When the MODE pin is set to logic low, the buck regulator operates in PWM mode when the load is around the nominal value. When the load current falls below a predefined threshold the regulator operates in power save mode (PSM) improving the light-load efficiency. The low quiescent current, low dropout voltage, and wide input voltage range of the ADP5040 LDOs extend the battery life of portable devices. The ADP5040 LDOs maintain a power supply rejection greater than 60 dB for frequencies as high as 10 kHz while operating with a low headroom voltage.
Each regulator in the ADP5040 is activated by a high level on the respective enable pin. The output voltages of the regulators are programmed though external resistor dividers to address a variety of applications.
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
The ADP5040 evaluation board enables evaluation of the ADP5040, which has one step-down regulator and two LDOs. The evaluation board is available in standard voltage options and it can be reconfigured to user-specific voltage options by replacing the assembled resistor networks.
The ADP5040 uses a proprietary high speed, current mode, constant frequency, pulse-width modulation (PWM) control scheme for excellent stability and transient response. To ensure the longest battery life in portable applications, the ADP5040 features a power save mode (PSM) that reduces the switching frequency under light load conditions, as well as the option to change the mode to fixed PWM operation. The 3 MHz switching frequency minimizes the size of the external components.
The low quiescent current, low dropout voltage, and wide input voltage range of the ADP5040 LDO regulators extend the battery life of portable devices.
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