LTC3562

PRODUCTION

I2C Quad Synchronous Step-Down DC/DC Regulator 2 x 600mA, 2 x 400mA

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Overview

  • Four Independent I2C Controllable Step-Down Regulators (2 x 600mA, 2 x 400mA)
  • Two I2C Programmable Feedback Voltage Regulators (R600A, R400A): VFB 425mV to 800mV
  • Two I2C Programmable Output Voltage Regulators (R600B, R400B): VOUT 600mV to 3.775V
  • Programmable Modes: Pulse Skip, LDO, Burst Mode®, Forced Burst Mode Operation
  • Quiescent Current <100uA (All Regulators Enabled in LDO Mode)
  • Fixed 2.25MHz Switching Frequency (Pulse Skip Mode)
  • Slew Limiting Reduces Switching Noise
  • Power-On Reset Output for Regulator R600A
  • Small, Thermally Enhanced, 20-Lead 3mm x 3mm QFN Package

The LTC3562 is a quad high efficiency monolithic synchronous step-down regulator with an I2C interface. Two regulators are externally adjustable and can have their feedback voltages programmed between 425mV and 800mV in 25mV steps (Type A). The other two regulators are fixed output regulators whose output voltages can be programmed between 600mV and 3.775V in 25mV steps (Type B). All four regulators operate independently and can be put into pulse skip, LDO, Burst Mode operation, or forced Burst Mode operation through I2C control. The Type-A regulators have separate RUN pins that can be enabled if I2C control is unavailable.

The 2.85V to 5.5V input voltage range makes the LTC3562 ideally suited for single Li-Ion battery-powered applications. At low output load conditions, the regulators can be switched into LDO, Burst Mode operation, or forced Burst Mode operation, extending battery life in portable systems. The quiescent current drops to under 100uA with all regulators in LDO mode, and under 0.1uA when all regulators are shut down.

Switching frequency is internally set to 2.25MHz, allowing the use of small surface mount inductors and capacitors. All regulators are internally compensated. The LTC3562 is available in a low profile 3mm x 3mm QFN package.

Applications

  • Miscellaneous Handheld Applications with Multiple Supply Rails
  • Personal Information Appliances
  • Wireless and DSL Modems
  • Digital Still Cameras
  • MP3 Players
  • Portable Instruments
LTC3562
I2C Quad Synchronous Step-Down DC/DC Regulator 2 x 600mA, 2 x 400mA
High Efficiency Quad Step-Down Converter with I2C R600x Burst Mode Efficiency and Power Loss vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 2

Technical Articles 1

Data Sheet

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Software Resources

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Hardware Ecosystem

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Evaluation Kits

eval board
schematic 1
DC1123A

LTC3562EUD Demo Board | Quad, I2C Programmed, 2.85V ≤ VIN ≤ 5.5V, VOUT1, 2 = 1.8V, Adjusted at 600mA; VOUT3, 4 = 1.5V, Adjustable at 400mA

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Product Details

Demonstration circuit 1123 is a I2C-programmable Quad Synchronous Step-Down DC/DC Regulator featuring the LTC3562. The demo board operates with an input voltage range of 2.85V to 5.5V. The LTC3562 features two 600mA regulators and two 400mA regulators. Two regulators (Type A) are adjusted by programming their  feedback voltages between 425mV and 800mV in 25mV. The other two regulators are adjusted by programming the output voltage between 600mV and 3.775V in 25mV steps (Type B). All four regulators operate independently and can be put into pulse skip, LDO, Burst Mode operation or forced Burst Mode operation through I2C control.


 
DC1123A
LTC3562EUD Demo Board | Quad, I2C Programmed, 2.85V ≤ VIN ≤ 5.5V, VOUT1, 2 = 1.8V, Adjusted at 600mA; VOUT3, 4 = 1.5V, Adjustable at 400mA
DC1123A - Schematic

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