LT3085 datasheet(5/36 Pages) LINER

5 / 36 page

LT3045-1

30451fa

For more information www.linear.com/LT3045-1

ELECTRICAL CHARACTERISTICS

Note 6: GND pin current is tested with VIN = VOUT(NOMINAL) and a current

source load. Therefore, the device is tested while operating in dropout. This

is the worst-case GND pin current. GND pin current decreases at higher

input voltages. Note that GND pin current does not include SET pin or ILIM

pin current but Quiescent current does include them.

Note 7: SET and OUTS pins are clamped using diodes and two 25Ω series

resistors. For less than 5ms transients, this clamp circuitry can carry

more than the rated current. Refer to Applications Information for more

information.

Note 8: Adding a capacitor across the SET pin resistor decreases output

voltage noise. Adding this capacitor bypasses the SET pin resistor’s

thermal noise as well as the reference current’s noise. The output noise

then equals the error amplifier noise. Use of a SET pin bypass capacitor

also increases start-up time.

Note 9: The LT3045-1 is tested and specified under pulsed load conditions

such that TJ ≈ TA. The LT3045-1E is 100% tested at 25°C and performance

is guaranteed from 0°C to 125°C. Specifications over the –40°C to 125°C

operating temperature range are assured by design, characterization, and

correlation with statistical process controls. The LT3045-1I is guaranteed

over the full –40°C to 125°C operating temperature range. High junction

temperatures degrade operating lifetimes. Operating lifetime is derated at

junction temperatures greater than 125°C.

Note 10: Parasitic diodes exist internally between the VIOC, ILIM, PG,

PGFB, SET, OUTS, and OUT pins and the GND pin. Do not drive these pins

more than 0.3V below the GND pin during a fault condition. These pins

must remain at a voltage more positive than GND during normal operation.

Note 11: The current limit programming scale factor is specified while the

internal backup current limit is not active. Note that the internal current

limit has foldback protection for VIN – VOUT differentials greater than 12V.

Note 12: The internal back-up current limit circuitry incorporates foldback

protection that decreases current limit for VIN – VOUT > 12V. Some level of

output current is provided at all VIN – VOUT differential voltages. Consult the

Typical Performance Characteristics graph for current limit vs VIN – VOUT.

Note 13: For output voltages less than 1V, the LT3045-1 requires a 10µA

minimum load current for stability.

Note 14: Maximum OUT-to-OUTS differential is guaranteed by design.

Note 15: The VIOC buffer outputs a voltage equal to VIN – VOUT or

VIN – 1.5V (for VOUT ≤ 1.5V). See Block Diagram and Applications

Information for further information. The VIOC pin’s source current should

be set between 10µA and 200µA.

LT3085 Datasheet(PDF) 5 Page - Linear Technology

LT3085 Datasheet(HTML) 5 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

Datasheet Download

Link URL