LT3500 Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

componentes Descripción

Fabricante

LT3500

Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller

Linear Technology 

LT3500

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TJ = 25°C. VVIN = 15V, VRT/SYNC = 2V, unless otherwise specified.

PARAMETER

LFB Voltage

LFB Line/Load Regulation

SS to LFB Offset (VSS – VLFB)

LFB Bias Current

LDRV Dropout (VVIN – VLDRV)

LDRV Maximum Current

CONDITIONS

VLDRV = VLFB

VVIN = 3V to 40V, VLDRV = VLFB

VSS = 0.8V, VLDRV = VLFB

VLFB = 0.8V

VLDRV = 3V, ILDRV = 5mA

VLDRV = 0V

MIN TYP MAX UNITS

l 0.784 0.8 0.816

V

l 0.776 0.8 0.824

V

90

115

140

mV

115

300

nA

l 0.8

1.2

1.6

V

l

9

13

18

mA

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note2: The LT3500EDD/LT3500EMSE is guaranteed to meet performance

specifications from 0°C to 125°C junction temperature. Specifications over

the –40°C to 125°C operating junction temperature range are assured by

design, characterization and correlation with statistical process controls.

The LT3500IDD/LT3500IMSE is guaranteed over the full –40°C to 125°C

operating junction temperature range. The LT3500HDD/LT3500HMSE is

guaranteed over the full –40°C to 150°C operating junction temperature

range. High junction temperatures degrade operating lifetimes. Operating

lifetime is derated at junction temperatures greater than 125°C.

Note 3: Minimum input voltage is defined as the voltage where internal

bias lines are regulated so that the reference voltage and oscillator remain

constant. Actual minimum input voltage to maintain a regulated output

will depend upon output voltage and load current. See Applications

Information.

Note 4: An internal power-on reset (POR) latch is set on the positive

transition of the SHDN pin through its threshold. The output of the latch

activates a current source on the SS pin which typically sinks 600μA,

discharging the SS capacitor. The latch is reset when the SS pin is driven

below the soft-start POR threshold or the SHDN pin is taken below its

threshold.

Note 5: This is the minimum voltage across the boost capacitor needed to

guarantee full saturation of the internal power switch.

Note 6: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed the maximum operating junction temperature

when overtemperature protection is active. Continuous operation above

the specified maximum operating junction temperature may impair device

reliability.

TYPICAL PERFORMANCE CHARACTERISTICS

Feedback Voltage vs Temperature

0.820

0.815

0.810

0.805

0.800

0.795

FB

LFB

0.790

0.785

0.780

–50 –25

0 25 50 75 100 125 150

TEMPERATURE (°C)

3500 G01

RT/SYNC Voltage vs Temperature

1.10

1.08

1.06

RRT/SYNC = 90.9k

1.04

1.02

1.00

0.98

0.96

RRT/SYNC = 15k

0.94

0.92

0.90

–50 –25 0 25 50 75 100 125 150

TEMPERATURE (°C)

3500 G02

Shutdown Threshold and Minimum

Input Voltage vs Temperature

3.0

2.5

MINIMUM INPUT VOLTAGE

2.0

1.5

1.0

SHUTDOWN THRESHOLD

0.5

0

–50 –25

0 25 50 75 100 125 150

TEMPERATURE (°C)

3500 G03

3500fc

4

Share Link: