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µPMIC for Microprocessors or DSPs in Portable Equipment

Step-Down DC-DC Integrates 2 LDOs and Reset in Tiny TDFN to Power Microprocessor in Portables

Product Details

Key Features

Parametric specs for Multifunction PMICs
VIN (V) (min) 2.7
VIN (V) (max) 5.5
# Step-Down Outputs 1
# LDO Outputs 2
VOUT (V) (min) 0.6
VOUT (V) (max) 3.3
Package/Pins TDFN/14
Budgetary
Price (See Notes)
2.9
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Simplified Block Diagram

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Parameters

Parametric specs for Multifunction PMICs
VIN (V) (min) 2.7
VIN (V) (max) 5.5
# Step-Down Outputs 1
# LDO Outputs 2
VOUT (V) (min) 0.6
VOUT (V) (max) 3.3
Package/Pins TDFN/14
Budgetary
Price (See Notes)
2.9

Key Features

  • Three Regulators and a Reset in One Package
  • High-Efficiency Step-Down Converter
    • Up to 4MHz Fixed Switching Frequency
    • 500mA Guaranteed Output Current
    • 0.6V to 3.3V Adjustable Output Voltage
    • ±2% Initial Accuracy
    • Fast Voltage-Positioning Transient Response
    • Internal Synchronous Rectifier
  • Two 300mA LDO Regulators
    • 200mV Dropout at 200mA Load
    • Low 45µVRMS Output Noise
    • 3% Accuracy over Line, Load, and Temperature
    • Overcurrent Protection
    • Nine Pin-Selectable Output-Voltage Settings
  • 30ms (min) Active-Low RESET Output Flag
  • 2.7V to 5.5V Input
  • 115µA (typ) Supply Current at No Load
  • Thermal-Overload Protection
  • Tiny 3mm x 3mm x 0.8mm TDFN Package

Applications/Uses

  • Cellular Handsets
  • Microprocessor and DSP Solutions including MSM™, Intel XScale™, ARM™, and OMAP™
  • PDAs
  • Smartphones/PDA Phones
  • Wireless Local Area Networks (WLANs)

Description

The MAX8620Y micro-power-management integrated circuit (µPMIC) powers low-voltage microprocessors or DSPs in portable devices. The µPMIC includes a high efficiency step-down DC-DC converter, two lowdropout linear regulators (LDOs), a microprocessor reset output, and power-on/off control logic. This device maintains high efficiency at light loads with a low 115µA supply current, and its miniature TDFN package makes it ideal for portable devices.

The MAX8620Y's step-down DC-DC converter utilizes a proprietary 4MHz hysteretic-PWM control scheme that allows for ultra-small external components. Internal synchronous rectification improves efficiency and eliminates the external Schottky diode that is required in conventional step-down converters. The output voltage is adjustable from 0.6V to 3.3V, with guaranteed output current up to 500mA.

The MAX8620Y's two LDOs offer low 45µVRMS output noise and a low dropout of only 200mV at 200mA. Each LDO delivers at least 300mA of continuous output current. The output voltages are pin selectable from 1.8V to 3.3V for flexibility.

A microprocessor reset output (active-low RESET) monitors OUT1 and warns the system of impending power loss allowing safe shutdown. Active-low RESET asserts during power-up, power-down, shutdown, and fault conditions where VOUT1 is below its regulation voltage.

Simplified Block Diagram

MAX8620Y: Typical Operating Circuit MAX8620Y: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .