Features: ♦ Prebias Startup/Monotonic
♦ 1% Output Accuracy
♦ Ceramic, Polymer, or Electrolytic Capacitors
♦ 200kHz to 1MHz Adjustable Frequency
♦ 160kHz to 1.2MHz Synchronization
♦ Lossless, Foldback Current Limit
♦ Overvoltage Protection
♦ Enable (On/Off)
♦ Adjustable Soft-Start
♦ MAX8544
Latch-Off/Autorecovery
Power-OK Monitor
Out-of-Phase Clock OutputApplicationBase Stations
Networks and Telecom
Storage
ServersPinout
SpecificationsMAX8544
ABSOLUTE MAXIMUM RATINGS
IN, EN, CS+, CS- to GND ......................................-0.3V to +14V
BST, DH to LX .........................................................-0.3V to +6V
BST to GND...........................................................-0.3V to +20V
DL, COMP, ILIM2, SS, SYNCO,
FSYNC to GND ...........................................-0.3V to (VVL + 0.3V)
VL, FB, POK, ILIM1, ILIM, MODE to GND .................-0.3V to +6V
PGND to GND ..........................................................-0.3V to +0.
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C) .......666.7mW
20-Pin QSOP (derate 9.1mW/°C above +70°C) .......727.3mW
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
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.
DescriptionThe MAX8543/MAX8544 current-mode, constant-frequency PWM buck controllers operate from a 3V to13.2V input supply and generate adjustable 0.8V to 0.9 VIN output voltages at loads up to 25A. MAX8543 feature adjustable switching frequency and synchronization for noise-sensitive applications.
The MAX8543/MAX8544 can start with (or without) a preexisting bias on the output, without discharging the output. This feature simplifies tracking supply designs for core and I/O applications and redundant supply designs.
core and I/O applications and redundant supply designs. The MAX8543/MAX8544 use the DC resistance of the output inductor as the current-sense element for lossless, low-cost current sensing. The current-sense threshold can be set to four discrete levels to accommodate inductors with different DC resistance values.
The MAX8544 features a power-OK monitor and two MAX8544 controllers that can operate at 180° out-ofphase for dual-output applications.
MAX8543 Data Sheet
