XZ1561B

XZ1561B 2A, 20V Synchronous Rectified CRT Electronic Technology LIMITED FEATURES           4.6V to 20V operating input range 2A output current Up to 94% efficiency High efficiency (>85%) at light load Adjustable Soft-Start Fixed 550kHz Switching frequency Input under voltage lockout Available in thermally enhanced SOP8 package Start-up current run-away protection Short circuit protection Thermal protection under voltage lockout. The XZ1561B is available in an 8-pin SOP package, which provides a compact solution with minimal external components. The package has an exposed pad for low thermal resistance. APPLICATIONS      Distributed Power Systems Networking Systems FPGA, DSP, ASIC Power Supplies Green Electronics/ Appliances Notebook Computers PIN CONFIGURATION DESCRIPTION TOP VIEW The XZ1561B is a current mode monolithic buck switching regulator. Operating with an input range of 4.6-20V, the XZ1561B delivers 2A of continuous output current with two integrated N-Channel MOSFETs. The internal synchronous power switches provide high efficiency without the use of an external Schottky diode. At light loads, regulators operate in low frequency to maintain high efficiency and low output ripple. Current mode control provides tight load transient response and cycle-by-cycle current limit. The XZ1561B guarantees robustness with short-circuit protection, thermal protection, start-up current run-away protection, and input REV: 0.1 Step-Down Converter BST 1 8 SS VIN 2 7 EN SW 3 6 NC GND 4 5 FB EXPOSED PAD(PIN 9) IS GND, MUST BE SOLDERED TO PCB http://www.china-crt.com 1/8 CRT Electronic Technology LIMITED XZ1561B ORDER INFORMATION PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE SOP8 XZ1561B -40℃ to +85℃ TYPICAL APPLICATION 3.3V/2A Step Down Regulators Efficiency vs Load Current 100nF 95 10μH Vin 4.6V TO 20V VIN BST SW EN FB 320k 10uF GND SS 100k 93 EFFICIENCY(%) 100k 47μF Vout=5V 94 Vout 3.3V/2.5A Vout=3.3V 92 91 90 89 Vout=2.5V 88 87 86 0.1μF Vin=12V 85 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 LOAD CURRENT(A) ABSOLUTE MAXIMUM RATING Item Extreme value VIN, EN -0.3V to +20V SW -0.3V to +20V BST SW-0.3V to SW+5V All other pins -0.3V to 6V Junction Temperature 125℃ Lead Temperature 260℃ -65 ℃ to +150 ℃ Storage Temperature RECOMMEND OPERATING RANGE Item Input Voltage VIN Recommend value 4.6V to 20V Output voltage Vout Operating Junction Temperature (TJ) REV: 0.1 0.923V to 17V -40℃ to +85℃ http://www.china-crt.com 2/8 CRT Electronic Technology LIMITED XZ1561B ELECTRICAL CHARATERISTICS VIN=12V, TA=25℃, unless otherwise stated. Item Symbol Condition Min. Typ. Max. Units VIN Undervoltage Lockout Thershold VIN_MIN VIN falling V VIN Undervoltage Lockout Hysteresis VIN_MIN_HYST VIN rising mV Shutdown Supply Current ISD VEN=0V μA Supply Current IQ VEN=5V, VFB=2V μA Feedback Voltage VFB 4.6V