DESCRIPTION
The LTC®3562 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.
FEATURES
■ Four Independent I2C Controllable Step-Down
Regulators (2 × 600mA, 2 × 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 < 100μA (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 × 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
