MAX MAX1631 MAX1631EAI MMulti-Output, Low-Noise Power-Supply Controllers for Notebook Computers
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 onboard power-up sequencing, power-good signaling with delay, digital soft-start, secondary winding control, lowdropout 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 systemsuspend 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 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.
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 (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:
- Notebook and Subnotebook Computers
- PDAs and Mobile Communicators
- Desktop CPU Local DC-DC Converters
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