EVALUATION KIT AVAILABLE MAX8513/MAX8514 Wide-Input, High-Frequency Triple-Output Supplies with Voltage Monitor and Power-On Reset General Description Features The MAX8513/MAX8514 integrate a voltage-mode PWM Low-Cost DC-DC Controller with Two LDOs step-down DC-DC controller and two LDO controllers, a Wide Input Range: 4.5V to 28V voltage monitor, and a power-on reset for the lowest-cost 300kHz to 1.4MHz Adjustable Switching Frequency power-supply and monitoring solution for xDSL modems, Low Noise for High Data-Rate xDSL Applications routers, gateways, and set-top boxes. Synchronizable to External Clock The DC-DC controller switching frequency can be set with an external resistor from 300kHz to 1.4MHz, to allow for Adjustable Soft-Start the optimization of cost, size, and efficiency. For noise- Lossless Adjustable Foldback Current Limit sensitive applications, the DC-DC controller can also Power-On Reset with 140ms Delay be synchronized to an external clock, minimizing noise Adjustable Input Power-Fail Warning for Dying Gasp interference. Operation above 1.1MHz reduces noise for high data-rate xDSL applications. An adjustable soft- Selectable Output-Voltage Sequencing or start and adjustable foldback current limit provide reliable Output-Voltage Tracking startup and fault protection. The DC-DC controller output Ordering Information voltage can be set externally to a voltage from 1.25V to 5.5V. Current limiting is accomplished by inductor current PART TEMP RANGE PIN-PACKAGE sensing for improved efficiency, or by an external sense MAX8513EEI 28 QSOP -40 C to +85 C resistor for better accuracy. MAX8514EEI 28 QSOP -40 C to +85 C The MAX8513/MAX8514s first LDO controller is designed MAX8514AEI 28 QSOP -40C to +125 C to provide a low-cost, high-current regulated output from 0.8V to 5.5V using an N-channel MOSFET or a low- Functional Diagram current output using a low-cost NPN transistor. The MAX8513s second regulator can be used to generate V IN (4.5V TO 28V) 0.8V to 27V output with a low-cost PNP transistor. Both LDO regulators can operate either from the DC-DC con- MAX8513 troller output or from a higher voltage derived with a fly- ON back overwinding on the DC-DC converter inductor. The V OFF OUT1 STEP- (1.25V TO 5.5V) MAX8514s second LDO regulator is designed to provide DOWN CONTROLLER a negative output with an NPN transistor. SYNC A sequence input allows the outputs to either power up together, or for the DC-DC regulator to power up first and each LDO controller to power up in sequence. An input OUTPUT power-fail output (PFO) is provided for input power-fail POWER-ON RESET LDO warning, such as in dying-gasp applications. A power-on CONTROLLER 1 V OUT2 reset circuit with a 140ms delay is also included to indicate (0.8V TO V ) OUT1 when all outputs have achieved regulation and stabilized. Applications INPUT POWER- xDSL, Cable, ISDN Modems, and Routers LDO FAIL MONITOR CONTROLLER 2 Wireless Routers V OUT3 Set-Top Boxes (0.8V TO 27V) Pin Configurations appear at end of data sheet. 19-3178 Rev 1 4/14MAX8513/MAX8514 Wide-Input, High-Frequency Triple-Output Supplies with Voltage Monitor and Power-On Reset Absolute Maximum Ratings IN, DRV3P, SUP2 to GND .....................................-0.3V to +30V DH to LX ..................................................-0.3V to (V + 0.3V) BST DRV2 to GND ....................................... -0.3V to (V + 0.3V) PGND to GND ......................................................-0.3V to +0.3V SUP2 DRV3N to GND ..................(V - 28V) to (V + 0.3V) VL Short Circuit to GND ............................................Continuous SUP3N SUP3N FREQ, PFI, PFO, POR, SUP3N, SYNC/EN, Continuous Power Dissipation CSP, CSN to GND ...............................................-0.3V to +6V 28-Pin QSOP (derate 10.8mW/C above +70C) .......860mW VL to GND .................-0.3V to the lesser of (V + 0.3V) or +6V Operating Temperature Range IN COMP1, FB1, FB2, FB3P, FB3N, REF, ILIM, MAX8513EEI, MAX8514EEI .......................... -40C to +85C SS, SEQ to GND....................................-0.3V to (V + 0.3V) MAX8514AEI ................................................ -40C to +125C VL PVL to PGND ..........................................................-0.3V to +6V Junction Temperature ......................................................+150C DL to PGND ............................................-0.3V to (V + 0.3V) Storage Temperature Range ............................ -65C to +150C PVL BST to LX ................................................................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C 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. Electrical Characteristics (V = V = V = 12V, V = V - V = V = 5V, V = 3.3V, V = -5V, C = 4.7F, C = 0.22F, R = IN LX SUP2 PVL BST LX DRV3P SUP3N DRV3N VL REF FREQ 15.0k, T = 0C to +85C, unless otherwise noted. Typical values are at T = +25C.) A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GENERAL 5.5 28.0 IN Operating Range V IN = VL 4.5 5.5 V = 1.3V, V = V = 1.0V, does FB1 FB2 FB3 IN Supply Current not include switching current to PVL and 2.6 3.2 mA BST, SYNC/EN = VL IN Shutdown Current V = 0, R = 50k 200 300 A SYNC/EN FREQ VL REGULATOR VL Output Voltage V = 6V to 28V, I = 0.1mA to 40mA 4.75 5 5.25 V IN VL VL Dropout Voltage From IN to VL, V = 5V, I = 40mA 560 mV IN VL VL Line Regulation V = 6V to 28V, I = 5mA 0.05 % IN VL VL Undervoltage Threshold VL rising, V = 675mV (typ) 3.6 4.2 V HYST OUT1 (BUCK CONVERTER) Output Voltage Range V (Note 1) 1.25 5.50 V OUT1 FB1 Regulation Threshold V 1.234 1.25 1.259 V FB1 Error-Amplifier Open-Loop A 65 90 dB VOL Voltage Gain FB1 Input Bias Current I V = 1.3V -200 +10 +200 nA FB1 BIAS FB1 Error-Amplifier Gain Bandwidth 25 MHz DH Output-Resistance High R 1.5 2.55 DH HIGH DH Output-Resistance Low R 1.2 2.1 DH LOW DL Output-Resistance High R 2.5 5 DL HIGH DL Output-Resistance Low R 0.7 1.3 DL LOW Driver Dead Time t Starts from V = 1V or (V - V ) = 1V 50 ns dt DL DH LX Maxim Integrated 2 www.maximintegrated.com