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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

Printable Data Sheet

Product Details

Key Features

Simplified Block Diagram

Other products you might be interested in

Part No.	Description
MAX786	Dual-Output Power Supply Controller for Notebook Computers
MAX783	Triple-Output Power Supply Controller for Notebook Computers
MAX782	Triple-Output Power Supply Controller for Notebook Computers

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.

Hardware Development

Evaluation Board

MAX1630EVKIT

Data Sheet

Description/Applications

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

Data Sheet

Description/Applications

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

Data Sheet

Description/Applications

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

MAX1630EVKIT

Data Sheet

Description/Applications

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

Data Sheet

Description/Applications

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

Data Sheet

Description/Applications

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

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 .

Sampling:
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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 MAX1630MAX1635 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 MAX1630MAX1635 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.

Simplified Block Diagram

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 .

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INTERACTIVE Data Sheet

MAX1634

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

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

Other products you might be interested in

Technical Docs

Design & Development

Support & Training

Key Features

Applications/Uses

Description

Simplified Block Diagram

Technical Docs

Support & Training

MAX1634 Related Videos