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MAX1854

Features: High-Efficiency Voltage PositioningQuick-PWM Architecture±1% VOUT Line-Regulation AccuracyAdjustable Output Range (5-Bit DAC) MAX1716: 0.925V to 1.6V MAX1854: 0.925V to 2.0V MAX1855: 0.600V to 1.75V2V to 28V Input Range200/300/400/550kHz Switching FrequencyOutput Undervoltage ProtectionO...

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SeekIC No. : 004409376 Detail

MAX1854: Features: High-Efficiency Voltage PositioningQuick-PWM Architecture±1% VOUT Line-Regulation AccuracyAdjustable Output Range (5-Bit DAC) MAX1716: 0.925V to 1.6V MAX1854: 0.925V to 2.0V MAX1855: 0.600...

MAX1854 Data Sheet

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Part Number:
MAX1854
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

 High-Efficiency Voltage Positioning
 Quick-PWM Architecture
 ±1% VOUT Line-Regulation Accuracy
 Adjustable Output Range (5-Bit DAC)
    MAX1716: 0.925V to 1.6V
    MAX1854: 0.925V to 2.0V
    MAX1855: 0.600V to 1.75V
 2V to 28V Input Range
 200/300/400/550kHz Switching Frequency
 Output Undervoltage Protection
 Overvoltage Protection (MAX1716/MAX1855)
 Drive Large Synchronous-Rectifier MOSFETs
 1.7ms Digital Soft-Start
 700µA ICC Supply Current
 1µA Shutdown Supply Current
 2V ±1% Reference Output
 VGATE Transition-Complete Indicator
 Small 24-Pin QSOP Package


Application

Notebook Computers
Docking Stations
CPU Core Supply
Single-Stage (BATT to VCORE) Converters
Two-Stage (+5V to VCORE) Converters


Specifications

V+ to GND ..............................................................-0.3V to +30V
VCC, VDD to GND ......................................................-0.3V to +6V
PGND to GND......................................................................±0.3V
SHDN, VGATE to GND...............................................-0.3V to +6V
ILIM, FB, CC, REF, D0D4, VPS,
    TON to GND ...........................................-0.3V to (VCC + 0.3V)
SKIP to GND (Note 1).................................-0.3V to (VCC + 0.3V)
DL to PGND................................................-0.3V to (VDD + 0.3V)
BST to GND............................................................-0.3V to +36V
DH to LX....................................................-0.3V to (VBST + 0.3V)
LX to BST..................................................................-6V to +0.3V
CS to GND.................................................................-2V to +30V
REF Short Circuit to GND ............................................Continuous
Continuous Power Dissipation (TA = +70°C)
    24-Pin QSOP (derate 9.5mW/°C above +70°C)...........762mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C


Description

The MAX1716/MAX1854/MAX1855 step-down controllers are intended for core CPU DC-DC converters in notebook computers. They feature a dynamically adjustable output (5-bit DAC), ultra-fast transient response, high DC accuracy, and high efficiency needed for leading-edge CPU core power supplies. Maxim's proprietary Quick-PWM™ quick-response, constant-ontime PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns "instant-on" response to load transients while maintaining a relatively constant switching frequency.

The MAX1716/MAX1854/MAX1855 are designed specifically for CPU core applications requiring a voltage- positioned supply. The voltage-positioning input (VPS), combined with a high DC accuracy control loop, is used to implement a power supply that modifies its output set point in response to the load current. This arrangement decreases full-load power dissipation and reduces the required number of output capacitors.

The 28V input range of the MAX1716/MAX1854/MAX1855 enables single-stage buck conversion from high-voltage batteries for the maximum possible efficiency. Alternatively, the devices' high-frequency capability combined with two-stage conversion (stepping down the +5V system supply instead of the battery) allows the smallest possible physical size. The output voltage can be dynamically adjusted through the 5-bit digitalto- analog converter (DAC) inputs.

The MAX1716/MAX1854/MAX1855 are available in a 24-pin QSOP package. For applications requiring SpeedStep™ power control (see the MAX1717).




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