EFFICIENCY (%) LTC3830/LTC3830-1 High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation FEATURES DESCRIPTIO High Power Switching Regulator Controller The LTC 3830/LTC3830-1 are high power, high effi- ciency switching regulator controllers optimized for for 3.3V-5V to 1.xV-3.xV Step-Down Applications No Current Sense Resistor Required 3.3V-5V to 1.xV-3.xV step-down applications. A preci- Low Input Supply Voltage Range: 3V to 8V sion internal reference and feedback system provide 1% output regulation over temperature, load current Maximum Duty Cycle >91% Over Temperature All N-Channel External MOSFETs and line voltage variations. The LTC3830/LTC3830-1 use Excellent Output Regulation: 1% Over Line, Load a synchronous switching architecture with N-channel MOSFETs. Additionally, the chip senses output current and Temperature Variations High Efficiency: Over 95% Possible through the drain-source resistance of the upper Adjustable or Fixed 3.3V Output (16-Pin Version) N-channel FET, providing an adjustable current limit without a current sense resistor. Programmable Fixed Frequency Operation: 100kHz to 500kHz The LTC3830/LTC3830-1 operate with an input supply External Clock Synchronization voltage as low as 3V and with a maximum duty cycle of Soft-Start (16-Pin Version and LTC3830-1) >91% over temperature. They include a fixed frequency Low Shutdown Current: <10A PWM oscillator for low output ripple operation. The 200kHz Overtemperature Protection free-running clock frequency can be externally adjusted or Available in S8, S16 and SSOP-16 Packages synchronized with an external signal from 100kHz to 500kHz. U In shutdown mode, the LTC3830 supply current drops to APPLICATIO S <10A. The LTC3830-1 differs from the LTC3830 S8 ver- sion by replacing shutdown with a soft-start function. CPU Power Supplies Multiple Logic Supply Generator For a similar, pin compatible DC/DC converter with an Distributed Power Applications output voltage as low as 0.6V, please refer to the LTC3832. High Efficiency Power Conversion , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO V IN 3V TO 6V 4.7F Efficiency and Power Loss vs Load Current 5.1 100 4.0 + 220F 3.5 90 10V 0.1F LTC3830-1 MBR0520T1 3.0 80 SS PV CC2 0.01F M1 G1 70 2.5 Si7806DN COMP L 15k 0.1F 60 2.0 3.2H 1.8V GND PV CC1 9A 50 1.5 12.7k 1% M2 + C FB G2 B320A OUT 1.0 40 Si7806DN 270F 2V 5.36k 1% 0.5 30 V = 3.3V IN 3830 F01 V = 1.8V OUT 3.3nF 0 20 L: SUMIDA CDEP105-3R2MC-88 0192 3 4 5 6 7 810 C : PANASONIC EEFUEOD271R OUT LOAD CURRENT (A) 3830 TA02 Figure 1. High Efficiency 3V-6V to 1.8V Power Converter 3830fa 1 POWER LOSS (W) U ULTC3830/LTC3830-1 ABSOLUTE AXI U RATI GS (Note 1) Supply Voltage Junction Temperature (Note 11)........................... 125C V ....................................................................... 9V Operating Temperature Range (Note 9) .. 40C to 85C CC PV ................................................................ 14V Storage Temperature Range ................. 65C to 150C CC1,2 Input Voltage Lead Temperature (Soldering, 10 sec).................. 300C I , I ............................................... 0.3V to 14V FB MAX + SENSE , SENSE , FB, SHDN, FREQSET ....................... 0.3V to V + 0.3V CC UUW PACKAGE/ORDER I FOR ATIO ORDER PART ORDER PART TOP VIEW NUMBER NUMBER G1 1 8 G2 TOP VIEW PV 2 7 V /PV CC1 CC CC2 LTC3830ES8 LTC3830EGN G1 1 GND 3 6 COMP 16 G2 LTC3830ES PV 2 15 PV FB 4 5 SHDN S8 CC1 CC2 PGND 3 14 V PART MARKING CC S8 PACKAGE GN PART GND 4 8-LEAD PLASTIC SO 13 I FB 3830 MARKING T = 125C, = 130C/ W JMAX JA SENSE 5 12 I MAX FB 6 11 FREQSET 3830 + ORDER PART TOP VIEW SENSE 7 10 COMP NUMBER SHDN 8 9 SS G1 1 8 G2 PV 2 7 V /PV CC1 CC CC2 GN PACKAGE S PACKAGE LTC3830-1ES8 16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SO GND COMP 3 6 T = 125C, = 130C/ W (GN) JMAX JA FB 4 5 SS S8 T = 125C, = 100C/ W (S) JMAX JA PART MARKING S8 PACKAGE 8-LEAD PLASTIC SO 38301 T = 125C, = 130C/ W JMAX JA Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The denotes specifications that apply over the full operating temperature range, otherwise specifications are at T = 25C. V , PV , PV = 5V, unless otherwise noted. (Note 2) A CC CC1 CC2 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Supply Voltage 358 V CC PV PV , PV Voltage (Note 7) 3 13.2 V CC CC1 CC2 V Undervoltage Lockout Voltage 2.4 2.9 V UVLO V Feedback Voltage V = 1.25V 1.255 1.265 1.275 V FB COMP 1.252 1.265 1.278 V V Output Voltage V = 1.25V 3.250 3.3 3.350 V OUT COMP 3.235 3.3 3.365 V V Output Load Regulation I = 0A to 10A (Note 6) 2 mV OUT OUT Output Line Regulation V = 4.75V to 5.25V 0.1 mV CC 3830fa 2 U WWW