LT1304CS8-5 Linear Technology, LT1304CS8-5 Datasheet
LT1304CS8-5
Specifications of LT1304CS8-5
Available stocks
Related parts for LT1304CS8-5
LT1304CS8-5 Summary of contents
Page 1
... Peak switch current, internally set at 1A, can be reduced by adding a single resistor from the I high speed operation of the LT1304 allows the use of small, surface-mountable inductors and capacitors. The LT1304 is available in an 8-lead SO package. , LTC and LT are registered trademarks of Linear Technology Corporation. D1 ...
Page 2
... Current Limit Not Asserted I Pin Open LIM IN 20k from I to GND LIM U W INFORMATION ORDER PART NUMBER TOP VIEW LT1304CS8 FB (SENSE)* 8 LT1304CS8-3.3 7 SHDN LT1304CS8 LIM GND 5 S8 PART MARKING S8 PACKAGE 1304 13043 = 125 C, = 150 C/W JA 13045 MIN TYP MAX 1.5 1.65 8 120 ...
Page 3
ELECTRICAL C HARA TERISTICS C PARAMETER Switch Saturation Voltage Switch Leakage The denotes specifications which apply over the operating temperature range TYPICAL PERFORMANCE CHARACTERISTICS Switch Saturation Voltage 500 ...
Page 4
... V 1304 G07 V I LOAD Burst Mode is a trademark of Linear Technology Corporation. I (Pin 6): Current Limit Set Pin. Float for 1A peak switch LIM current; a resistor to ground will lower peak current. SHDN (Pin 7): Shutdown Input. When low, switching regulator is turned off. The low-battery detector remains active ...
Page 5
W BLOCK I D AGRA S LBI + 1 – 1.17V R3 FB – 1.24V V REF Figure 1. LT1304 Block Diagram. Independent Low-Battery Detector A3 Remains Alive When Device Is in Shutdown LBI 1 SENSE ...
Page 6
LT1304/LT1304-3.3/LT1304-5 U OPERATIO The LT1304’s operation can best be understood by exam- ining the block diagram in Figure 1. Comparator A1 monitors the output voltage via resistor divider string R3/R4 at the FB pin. When V is higher than the ...
Page 7
U OPERATIO Table 1 lists inductor suppliers along with appropriate part numbers. Table 1. Recommended Inductors VENDOR SERIES Sumida CD54, CD43 Coiltronics CTX20-1 Dale LPT4545 Coilcraft DO3316, DO1608, DO3308 Capacitor Selection Low ESR (Equivalent Series Resistance) capacitors should be used ...
Page 8
LT1304/LT1304-3.3/LT1304-5 U OPERATIO If the full power capability of the LT1304 is not required, peak switch current can be limited by connecting a resistor R from the I pin to ground. With R LIM LIM switch current is reduced to ...
Page 9
U OPERATIO V LBO 2V/DIV V LBI 200mV/DIV Figure 8. Low-Battery Detector Transfer Function. Pull- 22k 2V, Sweep Frequency = 10Hz IN Battery Life How may hours does it work? This is the bottom line question ...
Page 10
... Load Current. Internal Impedance of Alkaline AA Cells Accounts for Rapid Drop in Efficiency at Higher Load Current MBR0530 0. 3.83M* 5V LBI 100mA + I LIM 1.21M* 220 F GND 22k 1304 TA03 Super Burst is a trademark of Linear Technology Corporation. 10 100 200 LOAD CURRENT (mA) 1304 F12 Super Burst Efficiency ...
Page 11
U TYPICAL APPLICATIONS 2-Cell to 3.3V Boost Converter L1 C1** LT1304-3.3 100 F 2 CELLS SHDN I LIM NC SHUTDOWN *SUMIDA CD54-220 **AVX TPSD107M010R0100 3.3V SEPIC (Step-Up/Step-Down Converter) L1A 2. ...
Page 12
... PROVIDED BY AN INDEPENDENT CIRCUIT **SUMIDA CD54-220 † AVX TPSD107M010R0100 12 † D1 1.07M 1% 12V 200mA + 124k 47 F** 1% 16V 1304 TA11 MBRS130LT3 22 H** (5V SENSE LIM + † LT1304CS8-5 100 F 10V LBI SHDN GND LBO 5V to 12V Converter Efficiency 300 1 10 100 LOAD CURRENT (mA) 1304 TA12 < 2. OUT ...
Page 13
U TYPICAL APPLICATIONS + 2 CELLS SUMIDA CD43-100 ** MOTOROLA MBR0530 OPERATE 0V = SHUTDOWN 22k 2N3906 75k 3.3k * DALE LPE3325-A205 TRANSFORMER MEASURES 6.5mm 8.2mm 5.2mm (H) (605) 665-9301 LT1304/LT1304-3.3/LT1304-5 ...
Page 14
LT1304/LT1304-3.3/LT1304-5 U TYPICAL APPLICATIONS 0.1 F LT1304 SHUTDOWN SHDN I LIM *AVX TPS SERIES TANTALUM OR SANYO OS-CON **SUMIDA CD54-220 14 ...
Page 15
... CELLS *SUMIDA CD54-220 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of circuits as described herein will not infringe on existing patent rights. LT1304/LT1304-3.3/LT1304-5 2-Cell to 5V Converter with Auxiliary 10V Output ...
Page 16
... Dropout at Full Load : 499-3977 TELEX 0.189 – 0.197* (4.801 – 5.004 0.150 – 0.157** (3.810 – 3.988 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC SO8 0695 , 88% Efficiency Q Q Switch: 0.07 LT/GP 1195 10K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1995 ...