LTC3240

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3.3V/2.5V Step-Up/Step-Down Charge Pump DC/DC Converter

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Overview

  • Step-Up/Step-Down Charge Pumps Generate Fixed 3.3V or 2.5V Outputs
  • VIN Range: 1.8V to 5.5V
  • Output Current up to 150mA
  • Automatic Mode Switching
  • Constant Frequency (1.2MHz) Operation in Step-Up Mode
  • Low Dropout Regulator Operation in Step-Down Mode
  • Low No-Load Quiescent Current: IQ = 65µA
  • Built-In Soft-Start Reduces Inrush Current
  • Shutdown Disconnects Load from Input
  • Shutdown Current < 1µA
  • Short-Circuit/Thermal Protection
  • Available in a 6-Lead (2mm × 2mm) DFN Package

The LTC3240-3.3/LTC3240-2.5 are step-up/step-down charge pump DC/DC converters that produce a fixed regulated output voltage of 3.3V or 2.5V over a wide input voltage range (1.8V to 5.5V).

With input voltages greater than the regulated output voltage the LTC3240 operates as a low dropout regulator. Once the input voltage drops within 100mV of the regulated output voltage the part automatically switches to step-up mode. In step-up mode the LTC3240 operates as a constant frequency (1.2MHz) doubling charge pump.

The LTC3240-3.3/LTC3240-2.5 feature low no load operating current (65µA typical) and ultralow operating current in shutdown (<1µA). Built-in soft-start circuitry prevents excessive inrush current during start-up. Thermal shutdown and current-limit circuitry allow the parts to survive a continuous short-circuit from VOUT to GND.

The LTC3240-3.3/LTC3240-2.5 require only three tiny external ceramic capacitors for an ultrasmall application footprint. The LTC3240-3.3/LTC3240-2.5 are available in a 6-pin (2mm × 2mm) DFN package.

Applications

  • 2 AA to 2.5V
  • 2-3 AA/Li-Ion to 3.3V
  • Low Power Supplies for Cameras, I/O Supplies, Audio, PC Cards, Misc. Logic, etc., in a Wide Variety of Handheld Products

LTC3240
3.3V/2.5V Step-Up/Step-Down Charge Pump DC/DC Converter
Li-Ion to 3.3V at Up to 150mA Output Voltage vs Input Voltage (Full Range) Product Package 1
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Documentation

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Tools & Simulations

LTspice

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Evaluation Kits

eval board
DC903A-B

LTC3240EDC-2.5 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, VOUT = 2.5V @ Up to 150mA

Product Details

Demonstration circuit 903 is a step-up/step-down charge pump dc-dc converter. It comes with two assembly versions, DC903A-A and DC903A-B featuring the 150mA output current LTC3240-3.3 (3.3V output) and LTC3240-2.5 (2.5V output) respectively, each in a tiny 2mm x 2mm DFN package. The DC903A-A and DC903A-B operate with an input voltage from 1.8V to 5.5V.


When using the DC903A-A, the output current can reach up to 150mA when the input voltage is above 2.5V. The maximum output current of the DC903A-B is 60mA with a 1.8V input voltage. The DC903A optimizes the output efficiency by operating in the LDO step-down mode during the time the input is higher than the output voltage. When the input voltage drops low enough, The LTC3240 automatically switches to charge-pump doubling mode to extend system run-time. Built-in soft-start limits inrush current at turn-on, and short-circuit current limit/thermal protection help the part survive a continuous short-circuit.


Additionally, the DC903A features Automatic Burst Mode operation at light load to achieve low supply current (65µA, no load).

eval board
DC903A-A

LTC3240EDC-3.3 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, VOUT = 3.3V @ Up to 150mA

Product Details

Demonstration circuit 903 is a step-up/step-down charge pump dc-dc converter. It comes with two assembly versions, DC903A-A and DC903A-B featuring the 150mA output current LTC3240-3.3 (3.3V output) and LTC3240-2.5 (2.5V output) respectively, each in a tiny 2mm x 2mm DFN package. The DC903A-A and DC903A-B operate with an input voltage from 1.8V to 5.5V.


When using the DC903A-A, the output current can reach up to 150mA when the input voltage is above 2.5V. The maximum output current of the DC903A-B is 60mA with a 1.8V input voltage. The DC903A optimizes the output efficiency by operating in the LDO step-down mode during the time the input is higher than the output voltage. When the input voltage drops low enough, The LTC3240 automatically switches to charge-pump doubling mode to extend system run-time. Built-in soft-start limits inrush current at turn-on, and short-circuit current limit/thermal protection help the part survive a continuous short-circuit.


Additionally, the DC903A features Automatic Burst Mode operation at light load to achieve low supply current (65µA, no load).

DC903A-B
LTC3240EDC-2.5 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, VOUT = 2.5V @ Up to 150mA
DC903A-A - Schematic
DC903A-A
LTC3240EDC-3.3 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, VOUT = 3.3V @ Up to 150mA
DC903A-A - Schematic

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