MAX1854EEG ,High-Speed / Adjustable / Synchronous Step-Down Controllers with Integrated Voltage PositioningApplicationsV VCC DDV+SHDNNotebook ComputersILIM BSTDocking StationsDHREFOUTPUTCPU Core SupplyMAX17 ..
MAX1856EUB ,Wide Input Range / Synchronizable / PWM SLIC Power SupplyFeaturesThe MAX1856 offers a low-cost solution for generating a Low-Cost, Off-the-Shelf Transforme ..
MAX1856EUB+ ,Wide-Input-Range, Synchronizable, PWM SLIC Power SupplyELECTRICAL CHARACTERISTICS(V = SYNC/SHDN, V = 5V, V = 5V, R = 200kΩ, T = 0°C to +85°C. Typical valu ..
MAX1856EUB+T ,Wide-Input-Range, Synchronizable, PWM SLIC Power SupplyFeaturesThe MAX1856 offers a low-cost solution for generating a♦ Low-Cost, Off-the-Shelf Transforme ..
MAX1857EUA47 ,500mA / Low-Dropout / Ripple-Rejecting LDO in MAXELECTRICAL CHARACTERISTICS(V = +5.25V, V = 4.75V, SHDN = IN, SET = GND, T = 0°C to +85°C, unless ot ..
MAX1857EUA47+T ,500mA, Low-Dropout, Ripple-Rejecting LDO in µMAXApplications Ordering InformationNotebook ComputersPART* TEMP. RANGE PIN-PACKAGECellular and Cordle ..
MAX4762ETB ,Low-Voltage / Dual SPDT / Audio Clickless Switches with Negative Rail CapabilityELECTRICAL CHARACTERISTICS(V = +2.7V to +5.5V, T = -40°C to +85°C, unless otherwise noted. Typical ..
MAX4762ETB+ ,Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail CapabilityMAX4762–MAX4764/MAX4764A/MAX476519-3152; Rev 2; 1/06Low-Voltage, Dual SPDT, Audio ClicklessSwitches ..
MAX4762ETB+T ,Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail CapabilityELECTRICAL CHARACTERISTICS(V = +2.7V to +5.5V, T = -40°C to +85°C, unless otherwise noted. Typical ..
MAX4762EUB+ ,Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail CapabilityELECTRICAL CHARACTERISTICS(V = +2.7V to +5.5V, T = -40°C to +85°C, unless otherwise noted. Typical ..
MAX4764AETB+T ,Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail CapabilityELECTRICAL CHARACTERISTICS(V = +2.7V to +5.5V, T = -40°C to +85°C, unless otherwise noted. Typical ..
MAX4764EBC ,Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail CapabilityELECTRICAL CHARACTERISTICS(V = +2.7V to +5.5V, T = -40°C to +85°C, unless otherwise noted. Typical ..
MAX1854EEG
High-Speed / Adjustable / Synchronous Step-Down Controllers with Integrated Voltage Positioning
General DescriptionThe MAX1716/MAX1854/MAX1855 step-down con-
trollers 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 need-
ed for leading-edge CPU core power supplies. Maxim's
proprietary Quick-PWM™ quick-response, constant-on-
time PWM control scheme handles wide input/output
voltage ratios with ease and provides 100ns “instant-on”
response to load transients while maintaining a relative-
ly constant switching frequency.
The MAX1716/MAX1854/MAX1855 are designed
specifically for CPU core applications requiring a volt-
age-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-volt-
age 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 digital-
to-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).
________________________ApplicationsNotebook Computers
Docking Stations
CPU Core Supply
Single-Stage (BATT to VCORE) Converters
Two-Stage (+5V to VCORE) Converters
FeaturesHigh-Efficiency Voltage PositioningQuick-PWM Architecture±1% VOUTLine-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 ProtectionOvervoltage Protection (MAX1716/MAX1855)Drive Large Synchronous-Rectifier MOSFETs1.7ms Digital Soft-Start700µA ICCSupply Current1µA Shutdown Supply Current2V ±1% Reference OutputVGATETransition-Complete IndicatorSmall 24-Pin QSOP Package
MAX1716/MAX1854/MAX1855
High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning19-1758; Rev 0; 8/00
Pin Configuration appears at end of data sheet.Quick-PWM is a trademark of Maxim Integrated Products.
SpeedStep is a trademark of Intel Corp.
Ordering Information
Typical Operating Circuit
MAX1716/MAX1854/MAX1855
High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, V+ = +15V, VCC= VDD= 5V, SKIP= VCC, VPS = PGND, TA
= 0°C to +85°C, unless otherwise noted. Typical Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1:SKIPmay be forced below -0.3V, temporarily exceeding the absolute maximum rating, for the purpose of debugging proto-
type breadboards, using the no-fault test mode. Limit the current drawn to -2mA (max).
V+ to GND..............................................................-0.3V to +30V
VCC, VDDto GND.....................................................-0.3V to +6V
PGND to GND.....................................................................±0.3VSHDN, VGATE to GND.............................................-0.3V to +6V
ILIM, FB, CC, REF, D0–D4, VPS,
TON to GND...........................................-0.3V to (VCC+ 0.3V)
SKIPto 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/MAX1854/MAX1855
High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, V+ = +15V, VCC= VDD= 5V, SKIP= VCC, VPS = PGND, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1716/MAX1854/MAX1855
High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, V+ = +15V, VCC= VDD= 5V, SKIP= VCC, VPS = PGND, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1716/MAX1854/MAX1855
High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, V+ = +15V, VCC= VDD= 5V, SKIP= VCC, VPS = PGND, TA
= -40°C to +85°C, unless otherwise noted.) (Note 6)
