DC2258A Analog Devices

LT3048 Series Low Noise Bias Generator in 2mm 2mm DFN FEATURES DESCRIPTION n Generates Low Noise Bias Voltage from Single The LT 3048 series generate low noise, low ripple bias CellLi-Ion Battery supplies from input voltages of 2.7V to 4.8V. n Output Current: Up to 40mA The LT3048 includes a boost regulator and a LDO linear n Low Output Ripple and Noise: <500V P-P regulator. The boost regulator provides power to the n Boost Regulator linear regulator. n 1MHz Operation (LT3048) The boost regulator output voltage is regulated to 1.1V n 2.2MHz Operation (LT3048-XX) above the LDO output, optimizing LDO ripple rejection and n Integrated Schottky Diode transient response. Fixed frequency operation and current n Low Dropout Linear Regulator mode control allow the use of very small inductors and n 1.235V Feedback Voltage (LT3048) results in low, predictable output ripple. n Low Noise: <120V (10Hz to 100kHz) RMS n 0.1% Load Regulation The linear regulator in the LT3048 generates a program- n Fixed 3.3V, 5V, 12V, 15V and Adjustable Output Options mable output and the LT3048-XX generate fixed output n Short-Circuit and Thermal Protection voltages. High power supply ripple rejection combined n Load Disconnect in Shutdown with a low noise internal reference results in less than n 500V output ripple and noise. Available in 2mm 2mm DFN Package P-P The LT3048 is available in a 8-lead 2mm 2mm DFN package. APPLICATIONS All registered trademarks and trademarks are the property of their respective owners. n Sensor Bias n Op Amp Supply TYPICAL APPLICATION Efficiency 10H 80 IN 2.7V TO 4.8V 70 4.7F SW BSTOUT 60 V LDOIN IN 1F 50 LT3048-15 OUT LDOOUT 15V 40 1nF 1F V (V) I (mA) IN OUT OFF ON EN BYP 30 LDOOUT = 15V 2.7 19 GND L = 10H 3.3 22 3048 TA01a 20 DCR = 650m 3.6 24 V = 2.7V IN 10 V = 3.3V IN V = 3.6V IN 0 5 10 20 0 15 25 LOAD CURRENT (mA) 3048 TA01b Rev B 1 For more information www.analog.com EFFICIENCY (%)LT3048 Series ABSOLUTE MAXIMUM RATINGS (Note 1) V ..............................................................................6V Operating Junction Temperature Range (Note 2) IN SW ............................................................................25V E-Grade .............................................. 40C to 125C BSTOUT ....................................................................23V I-Grade............................................... 40C to 125C LDOIN .......................................................................22V Maximum Junction Temperature .......................... 125C LDOOUT ....................................................................22V Storage Temperature Range .................. 65C to 150C FB ...............................................................................6V BYP ........................................................................0.3V EN ...............................................................................6V PIN CONFIGURATION LT3048-XX LT3048 TOP VIEW TOP VIEW 8 8 SW 1 BSTOUT SW 1 BSTOUT 2 2 V 7 EN V 7 EN IN IN 9 9 GND GND 3 3 GND 6 LDOIN GND 6 LDOOUT BYP 4 5 LDOOUT BYP 4 5 FB DC PACKAGE DC PACKAGE 8-LEAD (2mm 2mm) PLASTIC DFN 8-LEAD (2mm 2mm) PLASTIC DFN = 102C/W = 102C/W JA JA EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT3048EDC PBF LT3048EDC TRPBF LGRR 8-Lead (2mm 2mm) Plastic DFN 40C to 125C LT3048IDC PBF LT3048IDC TRPBF LGRR 8-Lead (2mm 2mm) Plastic DFN 40C to 125C LT3048EDC-15 PBF LT3048EDC-15 TRPBF LGKK 8-Lead (2mm 2mm) Plastic DFN 40C to 125C LT3048IDC-15 PBF LT3048IDC-15 TRPBF LGKK 8-Lead (2mm 2mm) Plastic DFN 40C to 125C LT3048EDC-12 PBF LT3048EDC-12 TRPBF LGQQ 8-Lead (2mm 2mm) Plastic DFN 40C to 125C LT3048IDC-12 PBF LT3048IDC-12 TRPBF LGQQ 8-Lead (2mm 2mm) Plastic DFN 40C to 125C LT3048EDC-5 PBF LT3048EDC-5 TRPBF LGQR 8-Lead (2mm 2mm) Plastic DFN 40C to 125C LT3048IDC-5 PBF LT3048IDC-5 TRPBF LGQR 8-Lead (2mm 2mm) Plastic DFN 40C to 125C LT3048EDC-3.3 PBF LT3048EDC-3.3 TRPBF LGQS 8-Lead (2mm 2mm) Plastic DFN 40C to 125C LT3048IDC-3.3t PBF LT3048IDC-3.3 TRPBF LGQS 8-Lead (2mm 2mm) Plastic DFN 40C to 125C Contact the factory for parts specified with wider operating temperature ranges. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. Rev B 2 For more information www.analog.com