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Step-Up Converter for Handheld Applications

1A Boost Converter with Four External Components in a Small, 1.25mm x 1.25mm WLP Package

Product Details

Key Features

Applications/Uses

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.5
VIN (V) (max) 5.5
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 5
IOUT1 (A) (max) 1
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Synchronous Switching? Yes
ICC (mA) (typ) 0.045
Shutdown Mode Supply Current (µA) (typ) 0.8
Shutdown Mode Supply Current (µA) (max) 5
# DC-DC Outputs 1
Switching Frequency (kHz) 3000
Package/Pins WLP/9
Budgetary
Price (See Notes)
$0.52 @1k
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.5
VIN (V) (max) 5.5
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 5
IOUT1 (A) (max) 1
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Synchronous Switching? Yes
ICC (mA) (typ) 0.045
Shutdown Mode Supply Current (µA) (typ) 0.8
Shutdown Mode Supply Current (µA) (max) 5
# DC-DC Outputs 1
Switching Frequency (kHz) 3000
Package/Pins WLP/9
Budgetary
Price (See Notes)
$0.52 @1k

Key Features

  • Flexible System Integration
    • Up to 1A Output Current
    • 2.5V to 5.5V Input Voltage Range
    • 3.3V to 5.7V Output Voltage Options
  • Integrated Protection Increases System Robustness
    • Undervoltage Lockout (UVLO)
    • Short-Circuit Protection
    • Overtemperature Shutdown
  • High Efficiency and Low Quiescent Current Extends Battery Life
    • Over 90% Efficiency with Internal Synchronous Rectifier
    • 60µA IQ in Automatic Track Mode
    • 45µA IQ in Step-Up Mode
    • 30µA IQ in Track Mode
    • 1µA Shutdown Current
    • Skip Mode Under Light Load Condition Improves Efficiency
    • True Shutdown™ Prevents Current Flow from OUT_ to LX_
    • Soft-Start Limits Inrush Current to 480mA
  • Small Package and High Frequency Operation Reduce Board Space
    • 9-Bump 1.25mm × 1.25mm WLP Package
    • 3MHz PWM Switching Frequency
    • Small External Components

Applications/Uses

  • Cell Phones
  • eBooks
  • GPS, PND
  • Mobile Internet Devices
  • Smartphones

Description

The MAX8969 is a simple 1A step-up converter in a small package that operates in any single-cell Li-ion application. This IC provides protection features such as input undervoltage lockout, short circuit, and overtemperature shutdown.

The IC transitions to skip mode seamlessly under lightload conditions to improve efficiency. Under these conditions, switching occurs only as needed, reducing switching frequency and supply current to maintain high efficiency.

For higher efficiency when input voltage is closer to the output voltage, two special modes of operation are available: track and automatic track. These modes allow users to balance quiescent current (IQ) vs. transient response time into boost mode. In both modes, the p-channel MOSFET acts as a current-limited switch such that VOUT follows VIN. However, in track mode, the boost circuits are disabled and the system controls the boost function with the EN, TREN inputs (IQ = 30µA). In automatic track mode (ATM), the boost circuits are enabled and the device automatically transitions into boost mode when VIN falls to 95% of the target VOUT (IQ = 60µA).

The IC is available in a small, 1.25mm × 1.25mm, 9-bump WLP (0.4mm pitch) package.

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Simplified Block Diagram

MAX8969: Functional Diagram MAX8969 is a simple 1A step-up converter in a small package that operates in any single-cell Li-ion application | Functional Diagram 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 .