LT1301 Linear Technology Corporation, LT1301 Datasheet
LT1301
Available stocks
Related parts for LT1301
LT1301 Summary of contents
Page 1
... Micropower High Efficiency 5V/12V Step-Up DC/DC Converter for Flash Memory DESCRIPTION The LT1301 is a micropower step-up DC/DC converter that utilizes Burst Mode™ operation. The device can deliver 5V or 12V from a two-cell battery input. It features program- mable 5V or 12V output via a logic-controlled input, no- load quiescent current of 120 A and a shutdown pin which reduces supply current ...
Page 2
... Sense Voltage .......................................................... 20V Shutdown Voltage ................................................... 10V Select Voltage .......................................................... 10V I Voltage ............................................................ 0.5V LIM Maximum Power Dissipation ............................. 500mW Operating Temperature Range LT1301C ................................................... LT1301I .................................................. Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 C ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS I Quiescent Current ...
Page 3
... LT1301 G2 Load Transient Response of Figure 1 Circuit V OUT 100mV/DIV AC COUPLED 120mA I LOAD 0mA 200 s/DIV LT1301 G5 Select Pin Transient Response 12V V OUT 2V/DIV 5V V SELECT 10V/DIV 5ms/DIV LT1301 100 3.3V OUT IN 100 LOAD LT1301 LT1300 G3 LT1301 G6 LT1301 G9 3 ...
Page 4
... When grounded or floating converter regulates at 5V. May be driven under logic control. SHDN (Pin 3): Shutdown. Pull high to shut down the LT1301. Ground for normal operation. Sense (Pin 4): “Output” Pin. Goes to internal resistive divider. If operating at 5V output, a 0.1 F ceramic capaci- tor is required from Sense to Ground ...
Page 5
... TEST CIRCUITS U OPERATION Operation of the LT1301 is best understood by referring to the Block Diagram in Figure 2. When A1’s negative input, related to the Sense pin voltage by the appropriate resis- tor-divider ratio is higher that the 1.25V reference voltage, A1’s output is low. A2, A3 and the oscillator are turned off, drawing no current. Only the reference and A1 consume current, typically 120 A. When A1’ ...
Page 6
... IN Efficiency in 5V mode will be slightly less that in 12V mode due to the fact that the diode drop is a greater percentage of 5V than 12V. Since the bipolar switch in the LT1301 gets its base drive from reduction in switch efficiency IN occurs when in 5V mode ...
Page 7
... If a load is suddenly applied, output voltage will sag until C3 can be recharged and peak switch current returns to 1A. If the full capacity of the LT1301 is not required peak current can be reduced by changing the value shown in Figure 8. With switch current is limited to approximately 400mA ...
Page 8
... For lower output power a 1N4148 can be used although efficiency will suffer substantially. Layout Considerations The LT1301 is a high speed, high current device. The input capacitor must be no more than 0.2˝ from V ground. Connect the PGND and GND (pins 8 and 1) together under the package ...
Page 9
... L1 SELECT 47µH SW 2N3904 I LIM + PGND 7.5K 1µ INTENSITY ADJUST 100µA TO 2mA BULB CURRENT LT1301 CONTRAST V OUT –4V TO –29V 12mA MAXIMUM FROM 1.8V SUPPLY (77% EFFICIENT) 20mA MAXIMUM FROM 3V SUPPLY (83% EFFICIENT) 22µF 150K 35V + 12K + 12K 2.2µF LT1300 TA5 9 7 22pF ...
Page 10
... LT1301 U TYPICAL APPLICATIONS 5V + 33µ COILTRONICS CTX33 – 5V Converter L1 33µ 1N965 1N5817 1 4 1N4148 SELECT SHDN NC SHUTDOWN LT1301 OR 0.1µF LT1300 NC SENSE I LIM GND PGND 5V –V 5V OUT 300mA 33µF + 4.99K 1% 4.99K 1% LT1301 TA7 ...
Page 11
... S8 Package 8-Lead Plastic S0IC 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0.050 0.014 – 0.019 (0.355 – 0.483) (1.270) BSC LT1301 0.400 (10.160) MAX 0.250 ± 0.010 (6.350 ± 0.254 ...
Page 12
... LT1301 NORTHEAST REGION Linear Technology Corporation One Oxford Valley 2300 E. Lincoln Hwy.,Suite 306 Langhorne, PA 19047 Phone: (215) 757-8578 FAX: (215) 757-5631 Linear Technology Corporation 266 Lowell St., Suite B-8 Wilmington, MA 01887 Phone: (508) 658-3881 FAX: (508) 658-2701 FRANCE Linear Technology S.A.R.L. Immeuble "Le Quartz" ...