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Part Number: MAX1716
Description: The MAX1716/MAX1854/MAX1855 step-down controllers are intended for core CPU DC-DC converters in notebo...
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MAX1716
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DataSheet
General Description
MAX1716 General 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).
MAX1716 Maximum Ratings
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
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
MAX1716 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
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
MAX1716 Typical Application
Notebook Computers
Docking Stations
CPU Core Supply
Single-Stage (BATT to VCORE) Converters
Two-Stage (+5V to VCORE) Converters
Docking Stations
CPU Core Supply
Single-Stage (BATT to VCORE) Converters
Two-Stage (+5V to VCORE) Converters
MAX1716
PDF/DataSheet Download
- Datasheet: MAX1716
- File Size: 694276 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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