Features

• Input Voltage Range:
  1.14V to 3.5V (with Boost Enabled)
  1.14V to 5.5V (with External 5V Boost)
• Low Dropout Voltage: 100mV at I_OUT = 1.5A
• Adjustable Output Range: 0.4V to 2.6V
• Output Current: Up to 1.5A
• Excellent Supply Rejection Even Near Dropout
• Shutdown Disconnects Load from V_IN and V_BST
• Low Operating Current: I_IN = 950µA at V_IN = 1.5V
• Low Shutdown Current:
  I_IN < 1µA (Typ), I_BST = 0.1µA (Typ)
• Stable with 10µF or Greater Ceramic Capacitors
• Short-Circuit, Reverse Current Protected
• Overtemperature Protected
• Available in 10-Lead MSOP and 10-Lead (3mm × 3mm) DFN Packages

Typical Application

Description

The LTC3026 is a very low dropout (VLDO™) linear regulator that can operate at input voltages down to 1.14V. The device is capable of supplying 1.5A of output current with a typical dropout voltage of only 100mV. To allow operation at low input voltages the LTC3026 includes a boost converter that provides the necessary headroom for the internal LDO circuitry.

Output current comes directly from the input supply to maximize efficiency. The boost converter requires only a small chip inductor and ceramic capacitor for operation. Additionally, the boosted output voltage of one LTC3026 can supply the boost voltage for other LTC3026s, thus requiring a single inductor for multiple LDOs. A user supplied boost voltage can be used eliminating the need for an inductor altogether.

The LTC3026 regulator is stable with 10μF or greater ceramic output capacitors. The device has a low 0.4V reference voltage which is used to program the output voltage via two external resistors. The device also has internal current limit, overtemperature shutdown, and reverse output current protection. The LTC3026 is available in a small 10-lead MSOP or low profile (0.75mm) 10-lead 3mm × 3mm DFN package.