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MAX1634

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Multi Output, Low-Noise Power Supply Controllers for Notebook Computers

Notebook Power Controllers Offer the Highest Performance and the Smallest Size through the Highest Level of Integration

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Product Details

The MAX1630–MAX1635 are buck-topology, step-down, switch-mode, power-supply controllers that generate logic-supply voltages in battery-powered systems. These high-performance, dual/triple-output devices include on-board power-up sequencing, power-good signaling with delay, digital soft-start, secondary winding control, low-dropout circuitry, internal frequency-compensation networks, and automatic bootstrapping.

Up to 96% efficiency is achieved through synchronous rectification and Maxim's proprietary Idle Mode™ control scheme. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system-suspend or standby mode. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Strong 1A on-board gate drivers ensure fast external N-channel MOSFET switching.
These devices feature a logic-controlled and synchronizable, fixed-frequency, pulse-width-modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile communications and pen-entry applications. Asserting the active-low SKIP pin enables fixed-frequency mode, for lowest noise under all load conditions.
The MAX1630–MAX1635 include two PWM regulators, adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V modes. All these devices include secondary feedback regulation, and the MAX1630/MAX1632/MAX1633/ MAX1635 each contain 12V/120mA linear regulators. The MAX1631/MAX1634 include a secondary feedback input (SECFB), plus a control pin (STEER) that selects which PWM (3.3V or 5V) receives the secondary feedback signal. SECFB provides a method for adjusting the secondary winding voltage regulation point with an external resistor divider, and is intended to aid in creating auxiliary voltages other than fixed 12V.

The MAX1630/MAX1631/MAX1632 contain internal output overvoltage and undervoltage protection features.
See parametric specs for Step-Down Switching Regulators

Key Features

  • 96% Efficiency
  • +4.2V to +30V Input Range
  • 2.5V to 5.5V Dual Adjustable Outputs
  • Selectable 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™)
  • 12V Linear Regulator
  • Adjustable Secondary Feedback (MAX1631/MAX1634)
  • 5V/50mA Linear Regulator Output
  • Precision 2.5V Reference Output
  • Programmable Power-Up Sequencing
  • Power-Good (active-low RESET) Output
  • Output Overvoltage Protection (MAX1630/MAX1631/MAX1632)
  • Output Undervoltage Shutdown (MAX1630/MAX1631/MAX1632)
  • 200kHz/300kHz Low-Noise, Fixed-Frequency Operation
  • Low-Dropout, 99% Duty-Factor Operation
  • 2.5mW Typical Quiescent Power (+12V input, both SMPSs on)
  • 4µA Typical Shutdown Current
  • 28-Pin SSOP Package

Applications/Uses

  • Desktop CPU Local DC-DC Converters
  • Notebook and Subnotebook Computers
  • PDAs and Mobile Communicators
See parametric specs for Step-Down Switching Regulators
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.2
VIN (V) (max) 30
VOUT1 (V) (min) 2.5
VOUT1 (V) (max) 5
IOUT1 (A) (max) 4
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 200
300
Package/Pins See Data Sheet
See parametric specs for Step-Down Switching Regulators
View More

Technical Docs

Data Sheet Multi Output, Low-Noise Power Supply Controllers for Notebook Computers Sep 19, 2005
App Note Choosing the Right DC-DC Converter for Automotive Applications

Design & Development

Click any title below to view the detail page where available.

Evaluation Board

MAX1630EVKIT

Description

The MAX1630/MAX1631/MAX1632 evaluation kits (EV kits) each consist of one of three preassembled and tested evaluation boards (EV boards) that embody the standard application circuits. The MAX1630 and MAX1632 EV boards provide the triple-output 3.3V/5V/12V circuit, and the MAX1631 EV board provides the dual-output 3.3V/5V circuit.

All three use the same PC board but have different components to accommodate different input voltage ranges. The main differences between the MAX1630 and MAX1632 EV boards are in the turns ratio (1:4 or 1:2.2) and in the location of the transformer connection (3.3V side or 5V side). Connecting the transformer to the 3.3V side allows lower input voltage. Connecting the transformer to the 5V side provides slightly better efficiency and lower stress voltages.

These circuits are configured to deliver up to 3A of output current on each of the main PWM outputs with greater than 90% efficiency. The MAX1630/MAX1631/MAX1632 EV kits can also be used to evaluate other output voltages.

View Details

Features

  • Battery Range:
    • 5.2V to 20V (MAX1630)
    • 5.2V to 28V (MAX1631)
    • 6.5V to 28V (MAX1632)
  • Outputs:
    • 3.3V at 3A
    • 12V at 120mA
    • 5V at 3A
    • 5V at 30mA Keep-Alive
  • 1:4 Transformer (MAX1630)
    1:2.2 Transformer (MAX1632)
  • Adjustable 2.5V to 5.5V Outputs (optional resistor divider)
  • Precision 2.5V Reference Output
  • Oscillator Sync Input
  • Low-Noise Mode Control Input (active-low SKIP)
  • Power-Good Monitor (active-low RESET output)
  • Fully Assembled and Tested

Evaluation Board

MAX1631EVKIT

Description

The MAX1630/MAX1631/MAX1632 evaluation kits (EV kits) each consist of one of three preassembled and tested evaluation boards (EV boards) that embody the standard application circuits. The MAX1630 and MAX1632 EV boards provide the triple-output 3.3V/5V/12V circuit, and the MAX1631 EV board provides the dual-output 3.3V/5V circuit.

All three use the same PC board but have different components to accommodate different input voltage ranges. The main differences between the MAX1630 and MAX1632 EV boards are in the turns ratio (1:4 or 1:2.2) and in the location of the transformer connection (3.3V side or 5V side). Connecting the transformer to the 3.3V side allows lower input voltage. Connecting the transformer to the 5V side provides slightly better efficiency and lower stress voltages.

These circuits are configured to deliver up to 3A of output current on each of the main PWM outputs with greater than 90% efficiency. The MAX1630/MAX1631/MAX1632 EV kits can also be used to evaluate other output voltages.

View Details

Features

  • Battery Range:
    • 5.2V to 20V (MAX1630)
    • 5.2V to 28V (MAX1631)
    • 6.5V to 28V (MAX1632)
  • Outputs:
    • 3.3V at 3A
    • 12V at 120mA
    • 5V at 3A
    • 5V at 30mA Keep-Alive
  • 1:4 Transformer (MAX1630)
    1:2.2 Transformer (MAX1632)
  • Adjustable 2.5V to 5.5V Outputs (optional resistor divider)
  • Precision 2.5V Reference Output
  • Oscillator Sync Input
  • Low-Noise Mode Control Input (active-low SKIP)
  • Power-Good Monitor (active-low RESET output)
  • Fully Assembled and Tested

Evaluation Board

MAX1632EVKIT

Description

The MAX1630/MAX1631/MAX1632 evaluation kits (EV kits) each consist of one of three preassembled and tested evaluation boards (EV boards) that embody the standard application circuits. The MAX1630 and MAX1632 EV boards provide the triple-output 3.3V/5V/12V circuit, and the MAX1631 EV board provides the dual-output 3.3V/5V circuit.

All three use the same PC board but have different components to accommodate different input voltage ranges. The main differences between the MAX1630 and MAX1632 EV boards are in the turns ratio (1:4 or 1:2.2) and in the location of the transformer connection (3.3V side or 5V side). Connecting the transformer to the 3.3V side allows lower input voltage. Connecting the transformer to the 5V side provides slightly better efficiency and lower stress voltages.

These circuits are configured to deliver up to 3A of output current on each of the main PWM outputs with greater than 90% efficiency. The MAX1630/MAX1631/MAX1632 EV kits can also be used to evaluate other output voltages.

View Details

Features

  • Battery Range:
    • 5.2V to 20V (MAX1630)
    • 5.2V to 28V (MAX1631)
    • 6.5V to 28V (MAX1632)
  • Outputs:
    • 3.3V at 3A
    • 12V at 120mA
    • 5V at 3A
    • 5V at 30mA Keep-Alive
  • 1:4 Transformer (MAX1630)
    1:2.2 Transformer (MAX1632)
  • Adjustable 2.5V to 5.5V Outputs (optional resistor divider)
  • Precision 2.5V Reference Output
  • Oscillator Sync Input
  • Low-Noise Mode Control Input (active-low SKIP)
  • Power-Good Monitor (active-low RESET output)
  • Fully Assembled and Tested

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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

Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.2
VIN (V) (max) 30
VOUT1 (V) (min) 2.5
VOUT1 (V) (max) 5
IOUT1 (A) (max) 4
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 200
300
Package/Pins See Data Sheet
See parametric specs for Step-Down Switching Regulators

Key Features

  • 96% Efficiency
  • +4.2V to +30V Input Range
  • 2.5V to 5.5V Dual Adjustable Outputs
  • Selectable 3.3V and 5V Fixed or Adjustable Outputs (Dual Mode™)
  • 12V Linear Regulator
  • Adjustable Secondary Feedback (MAX1631/MAX1634)
  • 5V/50mA Linear Regulator Output
  • Precision 2.5V Reference Output
  • Programmable Power-Up Sequencing
  • Power-Good (active-low RESET) Output
  • Output Overvoltage Protection (MAX1630/MAX1631/MAX1632)
  • Output Undervoltage Shutdown (MAX1630/MAX1631/MAX1632)
  • 200kHz/300kHz Low-Noise, Fixed-Frequency Operation
  • Low-Dropout, 99% Duty-Factor Operation
  • 2.5mW Typical Quiescent Power (+12V input, both SMPSs on)
  • 4µA Typical Shutdown Current
  • 28-Pin SSOP Package

Applications/Uses

  • Desktop CPU Local DC-DC Converters
  • Notebook and Subnotebook Computers
  • PDAs and Mobile Communicators

Description

The MAX1630–MAX1635 are buck-topology, step-down, switch-mode, power-supply controllers that generate logic-supply voltages in battery-powered systems. These high-performance, dual/triple-output devices include on-board power-up sequencing, power-good signaling with delay, digital soft-start, secondary winding control, low-dropout circuitry, internal frequency-compensation networks, and automatic bootstrapping.

Up to 96% efficiency is achieved through synchronous rectification and Maxim's proprietary Idle Mode™ control scheme. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system-suspend or standby mode. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Strong 1A on-board gate drivers ensure fast external N-channel MOSFET switching.
These devices feature a logic-controlled and synchronizable, fixed-frequency, pulse-width-modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile communications and pen-entry applications. Asserting the active-low SKIP pin enables fixed-frequency mode, for lowest noise under all load conditions.
The MAX1630–MAX1635 include two PWM regulators, adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V modes. All these devices include secondary feedback regulation, and the MAX1630/MAX1632/MAX1633/ MAX1635 each contain 12V/120mA linear regulators. The MAX1631/MAX1634 include a secondary feedback input (SECFB), plus a control pin (STEER) that selects which PWM (3.3V or 5V) receives the secondary feedback signal. SECFB provides a method for adjusting the secondary winding voltage regulation point with an external resistor divider, and is intended to aid in creating auxiliary voltages other than fixed 12V.

The MAX1630/MAX1631/MAX1632 contain internal output overvoltage and undervoltage protection features.

Technical Docs

Data Sheet Multi Output, Low-Noise Power Supply Controllers for Notebook Computers Sep 19, 2005
App Note Choosing the Right DC-DC Converter for Automotive Applications

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