This document is a datasheet for the ADP1621 Constant-Frequency, Current-Mode Step-Up DC-to-DC Controller. The product features 92% efficiency (no sense resistor required), ±1.0% initial accuracy, IC supply voltage range of 2.9V to 5.5V, power-input voltage as low as 1.0V, capable of high supply input voltage (>5.5V) with an external NPN or a resistor, VIN UVLO and 35mA shunt regulator, external slope compensation with 1 resistor, programmable operating frequency (100kHz to 1.5MHz) with 1 resistor, lossless current sensing for switch-node voltage <30V, resistor current sensing for switch-node voltage >30V, synchronizable to external clock, current-mode operation for excellent line and load transient responses, 10μA shutdown current, current limit and thermal overload protection, soft start in 2048 clock cycles, and supported by ADIsimPower™ design tool.
The ADP1621 is a fixed-frequency, pulse-width modulation (PWM), current-mode, step-up converter controller designed to drive an external n-channel MOSFET. It eliminates the need for a current-sense power resistor by measuring voltage drops across the MOSFET's on-resistance, supporting switch-node voltages up to 30 V in lossless mode. The device features a supply input range of 2.9 V to 5.5 V and can operate with power inputs as low as 1.0 V.
| Supply Voltage Range (VIN) | 2.9 V to 5.5 V |
|---|---|
| Power-Input Voltage Minimum | 1.0 V |
| Shutdown Current | < 10 µA |
| Operating Frequency Range | 100 kHz to 1.5 MHz |
| Switch-Node Voltage Limit (Lossless) | < 30 V |
| Thermal Shutdown Threshold | 150 °C |
The IC supply voltage range is 2.9 V to 5.5 V.
Yes, the power-input voltage can be as low as 1.0 V for fuel cell applications.
The device supports a maximum switch-node voltage of less than 30 V.