ADI ADP1871ACPZ-0.6-R7

The ADP1870/ADP1871 are versatile current-mode synchronous buck controllers featuring a constant on-time, pseudo-fixed-frequency, programmable current-limit, current control scheme that delivers excellent transient response, optimum stability, and overcurrent protection. These devices employ a valley current-mode control architecture for optimum performance at low duty cycles. As a result, the ADP1870/ADP1871 can drive all N-channel power stages to regulate output voltages as low as 0.6 V. The ADP1871 is the power save mode (PSM) version of the ADP1870, capable of operating in pulse-skip mode to maintain output regulation at light loads while achieving higher system efficiency. The ADP1870/ADP1871 offer three frequency options — 300 kHz, 600 kHz, and 1.0 MHz — along with a PSM option, making them well-suited for a wide range of applications requiring a single input supply voltage of 2.95 V to 20 V. Low-voltage bias is provided through an internal 5 V LDO. In addition, these devices incorporate an internal fixed soft-start function that limits input inrush current from the input supply during startup, as well as reverse current protection for pre-biased outputs during soft-start. Low-side current sensing, a current gain scheme, an integrated boost diode, and a PSM/forced PWM option reduce external component count and improve efficiency. The ADP1870/ADP1871 operate over a junction temperature range of −40°C to +125°C and are available in 10-lead MSOP and LFCSP packages.

• Supply input voltage range: 2.95 V to 20 V
• On-chip bias regulator
• Minimum output voltage: 0.6 V
• 0.6 V, ±1.0% accuracy reference voltage
• Supports all power stage N-channel MOSFETs
• Three frequency options: 300 kHz, 600 kHz, and 1.0 MHz
• No current sense resistor required
• Power save mode (PSM) operation under light load conditions (ADP1871 only)
• Programmable resistor-set current sense gain
• Thermal overload protection
• Short-circuit protection
• Precision enable input
• Integrated bootstrap diode for high-side driving
• Startup into pre-biased load
• Small 10-lead MSOP and LFCSP packages

• Telecom and networking systems
• Mid-to-high-end servers
• Set-top boxes
• DSP core power supply
• 12 V input point-of-load power supply