MAX5088/MAX5089 19-3944 Rev 1 5/06 2.2MHz, 2A Buck Converters with an Integrated High-Side Switch General Description Features 4.5V to 5.5V or 5.5V to 23V Input Voltage Range The MAX5088/MAX5089 high-frequency, DC-DC con- verters with an integrated n-channel power MOSFET Output Voltage Adjustable Down to 0.6V provide up to 2A of load current. The MAX5088 2A Output Current includes an internal power MOSFET to enable the Synchronous Rectifier Driver Output (MAX5089) design of a nonsynchronous buck topology power sup- for Higher Efficiency ply. The MAX5089 is for the design of a synchronous buck topology power supply. These devices operate Resistor-Programmable Switching Frequency from a 4.5V to 5.5V or 5.5V to 23V input voltage and a from 200kHz to 2.2MHz 200kHz to 2.2MHz resistor-programmable switching External Synchronization and Enable (On/Off) frequency. The voltage-mode architecture with a peak Inputs switch current-limit scheme provides stable operation Clock Output for Driving Second Converter 180 up to a 2.2MHz switching frequency. The MAX5088 Out-Of-Phase (MAX5089) includes a clock output for driving a second DC-DC converter 180 out-of-phase and a power-on-reset Integrated 150m High-Side n-Channel Power (RESET) output. The MAX5089 includes a power-good MOSFET output and a synchronous rectifier driver to drive an Power-On Reset Output (MAX5088)/Power-Good external low-side MOSFET in the buck converter config- Output (MAX5089) uration for high efficiency. Short-Circuit Protection The MAX5088/MAX5089 protect against overcurrent Thermal-Shutdown Protection conditions by utilizing a peak current limit as well as Thermally Enhanced 16-Pin TQFN Package overtemperature shutdown providing a very reliable Dissipates 2.7W and compact power source for point-of-load regulation applications. Additional features include synchroniza- Ordering Information tion, internal digital soft-start, and an enable input. The MAX5088/MAX5089 are available in a thermally PIN- PKG PART TEMP RANGE enhanced, space-saving 16-pin TQFN (5mm x 5mm) PACKAGE CODE package and operate over the -40C to +125C tem- MAX5088ATE+ -40C to +125C 16 TQFN T1655-2 perature range. MAX5089ATE+ -40C to +125C 16 TQFN T1655-2 +Denotes lead-free package. Applications Pin Configurations xDSL Modem Power Supply Automotive Radio Power Supply TOP VIEW Servers and Networks 12 11 10 9 IP Phones/WLAN Access Points V SYNC 13 8 L Selector Guide RESET 14 7 V+ PART CONFIGURATION FEATURES MAX5088 Nonsynchronous RESET Output, BST/VDD 15 6 BYPASS MAX5088ATE Buck Clock Output EN 16 5 OSC EP* + PGOOD Output, MAX5089ATE Synchronous Buck Synchronous FET Driver 12 3 4 Pin Configurations continued at end of data sheet. THIN QFN *EXPOSED PAD. 5mm x 5mm Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE DRAIN SOURCE DRAIN PGND COMP SGND FB CKO2.2MHz, 2A Buck Converters with an Integrated High-Side Switch ABSOLUTE MAXIMUM RATINGS V+ to PGND............................................................-0.3V to +25V RESET, PGOOD to SGND ........................................-0.3V to +6V BST/VDD, DRAIN to SGND ....................................-0.3V to +30V BYPASS to SGND..................................................-0.3V to +2.2V SGND to PGND .....................................................-0.3V to +0.3V V and BYPASS Short-Circuit Duration to SGND ......Continuous L BST/VDD to SOURCE...............................................-0.3V to +6V Continuous Power Dissipation* (T = +70C) A SOURCE to SGND..................................................-0.6V to +25V 16-Pin TQFN (derate 33mW/C above +70C) ..........2666mW SOURCE or DRAIN Maximum Peak Current...............5A for 1ms Package Thermal Resistance (junction to case) ............1.7C/W V to SGND ................-0.3V to the lower of +6V and (V+ + 0.3V) L Operating Temperature Range .........................-40C to +125C SYNC, EN, DL, CKO, OSC, COMP, Junction Temperature Range ............................-65C to +150C FB to SGND...............................................-0.3V to (V + 0.3V) L Storage Temperature Range .............................-65C to +150C BYPASS, CKO, OSC, COMP, FB, EN, SYNC, RESET, Lead Temperature (soldering, 10s) .................................+300C PGOOD Maximum Input Current .................................50mA *As per JEDEC51 Standard (multilayer board). 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 = 5V or V+ = 5.5V to 23V, V = 5V, T = T = -40C to +125C, unless otherwise noted. Circuits of Figures 5 and 6. Typical L EN A J values are at T = T = +25C.) (Note 1) A J PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SYSTEM SPECIFICATIONS 5.5 23.0 V Input Voltage Range V+ V+ = V 4.5 5.5 V L V+ = 12V, V = 0.8V FB V+ Operating Supply Current I 1.8 2.5 mA Q R = 10k, no switching OSC V+ = 12V, V = 0V, PGOOD (MAX5089), EN V+ Standby Supply Current I RESET, CKO unconnected (MAX5088), 1 1.4 mA STBY R = 10k OSC Nonsynchronous (MAX5088), f = 1.25MHz, V+ = 12V, I = 1.5A, 79 SW OUT V = 3.3V OUT Efficiency % Synchronous (MAX5089), f = 300kHz, V+ = 12V, I = 1.5A, 90 SW OUT V = 3.3V OUT V REGULATOR (V )/BYPASS OUTPUT (BYPASS) L L V Undervoltage Lockout V V falling 4.1 4.3 V L UVLO L V Undervoltage Lockout L V 137 mV HYST Hysteresis V Output Voltage V V+ = 5.5V to 23V, I = 0 to 40mA 5.0 5.2 5.5 V L L VL V BYPASS Output Voltage BYPASS V+ = V = 5.2V 1.98 2 2.02 V L I steps from 0 to 50A, BYPASS BYPASS Load Regulation V 0 1.2 10 mV BYPASS V+ = V = 5.2V L 2 MAX5088/MAX5089