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8A Dual-Phase Switched-Capacitor Converter

Industry's Highest-Efficiency, lowest IQ Inductorless DC-DC Converter for 2S Li+ Batteries in a Tiny 7mm2 WLP Package

Product Details

The MAX77932C is a standalone, dual-phase switched-capacitor converter with integrated power switches that delivers 8A output current and divides the input voltage by two. The IC is suitable for applications that utilize 2S Li+ batteries while powering circuitry that operates at 1S-equivalent voltage. It is also suitable for applications migrating from 1S to 2S battery configurations. The IC simplifies this migration by converting the 2S battery voltage to 1S-equivalent output and allows designers to preserve the existing downstream 1S power architecture.

The inductorless switched-capacitor converter topology of the IC shrinks the overall footprint and reduces the maximum height of the circuit. Its high switching frequency, up to 1.5MHz, reduces the size and number of capacitors required, further minimizing the solution footprint. The IC ensures safe operation with integrated overvoltage, undervoltage, overcurrent, and thermal protection, and also minimizes EMI with built-in frequency dithering. In addition to the small solution size, lower EMI, and protection features, the ICs class-leading peak efficiency of 98.5% simplifies thermal design and makes it ideal for consumer, medical, and industrial applications.

The IC features an I2C compatible, 2-wire serial interface consisting of a bidirectional serial data line (SDA) and a serial clock line (SCL). The IC supports SCL clock rates up to 3.4MHz. The converter parameters such as OCP, OVLO or UVLO thresholds, switching frequency, soft-start current, and duration are easily adjustable through the I2C interface. The IC consumes a low quiescent current of 30μA when operating and 4μA in shutdown. The IC is available in a tiny, lead-free 0.4mm pitch, 2.4mm x 2.8mm 42-pin wafer-level package (WLP).

Key Features

  • ​8A Switched Capacitor Converter
  • 2S to 1S Battery Voltage Conversion (VOUT = VIN/2)
  • Integrated Power Switches
  • Low IQ: 30μA Operating, 4μA Shutdown
  • Soft-Start with Programmable Current and Timeout
  • Programmable Input Overvoltage Lockout
  • Programmable Output Overvoltage Lockout
  • Programmable Overcurrent Protection
  • Programmable Switching Frequency 0.25MHz to 1.5MHz
  • Thermal Alarm and Protection
  • Chip Enable Input
  • Power Good Indicator Output
  • Frequency Dithering
  • I2C Interface with Interrupt

Applications/Uses

  • Smartphones and Tablets
  • Ultrabook Computers
  • Chromebooks
  • DSLR and Mirrorless Cameras
  • Power Banks
  • 2S Li+ Battery Applications
  • Smartphone Direct Charging
  • Portable Printers
  • Portable Gaming Devices
  • Mobile Point-of-Sale (mPOS) Devices
  • Two-Way Radios
Parametric specs for Charge Pumps
Topology Divider
Unregulated
VIN (V) (min) 4.1
VIN (V) (max) 11
IOUT (A) (typ) 8
Unadj. VOUT (V) VIN/2
ICC (mA) (max) 0.03
Switching Frequency (kHz) 500
750
1000
1200
1500
Oper. Temp. (°C) -40 to +85
Package/Pins WLP/42
Budgetary
Price (See Notes)
$1.38 @1k
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Simplified Block Diagram

MAX77932C: Simplified Block Diagram MAX77932C: Simplified Block Diagram Zoom icon

Technical Docs

Design & Development

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Description

The MAX77932 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that evaluates the 8A dual-phase switched-capacitor converter MAX77932C.

The MAX77932 EV kit includes the IC evaluation board with an integrated I2C communication interface and a USB micro-B cable. Windows® based graphical-user interface (GUI) software is available for use with the EV kit and can be downloaded from Maxim’s website at www.maximintegrated.com/products/MAX77932C (under the Design Resources tab). Windows 7 or newer Windows operating system is required to use the EV kit software.

View Details

Features

  • 8A Switched-Capacitor Converter
  • 2S to 1S Battery Voltage Conversion
  • Integrated Power Switch
  • Soft-Start
  • Programmable Protection Thresholds
  • Thermal Alarm and Protection
  • Chip Enabled
  • I2C Interface with Interrupt Feature
  • On-Board I2C Communication Interface
  • Windows 7 or Newer Compatible Software
  • Proven PCB Layout
  • Fully Assembled and Tested

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Parameters

Parametric specs for Charge Pumps
Topology Divider
Unregulated
VIN (V) (min) 4.1
VIN (V) (max) 11
IOUT (A) (typ) 8
Unadj. VOUT (V) VIN/2
ICC (mA) (max) 0.03
Switching Frequency (kHz) 500
750
1000
1200
1500
Oper. Temp. (°C) -40 to +85
Package/Pins WLP/42
Budgetary
Price (See Notes)
$1.38 @1k

Key Features

  • ​8A Switched Capacitor Converter
  • 2S to 1S Battery Voltage Conversion (VOUT = VIN/2)
  • Integrated Power Switches
  • Low IQ: 30μA Operating, 4μA Shutdown
  • Soft-Start with Programmable Current and Timeout
  • Programmable Input Overvoltage Lockout
  • Programmable Output Overvoltage Lockout
  • Programmable Overcurrent Protection
  • Programmable Switching Frequency 0.25MHz to 1.5MHz
  • Thermal Alarm and Protection
  • Chip Enable Input
  • Power Good Indicator Output
  • Frequency Dithering
  • I2C Interface with Interrupt

Applications/Uses

  • Smartphones and Tablets
  • Ultrabook Computers
  • Chromebooks
  • DSLR and Mirrorless Cameras
  • Power Banks
  • 2S Li+ Battery Applications
  • Smartphone Direct Charging
  • Portable Printers
  • Portable Gaming Devices
  • Mobile Point-of-Sale (mPOS) Devices
  • Two-Way Radios

Description

The MAX77932C is a standalone, dual-phase switched-capacitor converter with integrated power switches that delivers 8A output current and divides the input voltage by two. The IC is suitable for applications that utilize 2S Li+ batteries while powering circuitry that operates at 1S-equivalent voltage. It is also suitable for applications migrating from 1S to 2S battery configurations. The IC simplifies this migration by converting the 2S battery voltage to 1S-equivalent output and allows designers to preserve the existing downstream 1S power architecture.

The inductorless switched-capacitor converter topology of the IC shrinks the overall footprint and reduces the maximum height of the circuit. Its high switching frequency, up to 1.5MHz, reduces the size and number of capacitors required, further minimizing the solution footprint. The IC ensures safe operation with integrated overvoltage, undervoltage, overcurrent, and thermal protection, and also minimizes EMI with built-in frequency dithering. In addition to the small solution size, lower EMI, and protection features, the ICs class-leading peak efficiency of 98.5% simplifies thermal design and makes it ideal for consumer, medical, and industrial applications.

The IC features an I2C compatible, 2-wire serial interface consisting of a bidirectional serial data line (SDA) and a serial clock line (SCL). The IC supports SCL clock rates up to 3.4MHz. The converter parameters such as OCP, OVLO or UVLO thresholds, switching frequency, soft-start current, and duration are easily adjustable through the I2C interface. The IC consumes a low quiescent current of 30μA when operating and 4μA in shutdown. The IC is available in a tiny, lead-free 0.4mm pitch, 2.4mm x 2.8mm 42-pin wafer-level package (WLP).

Simplified Block Diagram

MAX77932C: Simplified Block Diagram MAX77932C: Simplified Block 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