LT3519IMS-1#TRPBF Linear Technology, LT3519IMS-1#TRPBF Datasheet - Page 6

• Manufacturer Part Number: LT3519IMS-1#TRPBF
• Description: LED DRIVER WITH INTEGRATED SCHOT
• Manufacturer: Linear Technology
• Type: High Power, Constant Currentr

Specifications of LT3519IMS-1#TRPBF

• Constant Current: Yes
• Constant Voltage: Yes
• Topology: PWM, SEPIC, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive
• Frequency: 800kHz ~ 1.10MHz
• Voltage - Supply: 3 V ~ 30 V
• Mounting Type: Surface Mount
• Package / Case: 16-MSOP
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 750mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Efficiency: -

PIN FUNCTIONS
LT3519/LT3519-1/LT3519-2
GND (Pins 1, 8, 9, 16): Power Ground and Signal Ground.
Tie to GND plane for best thermal performance.
OPENLED (Pin 2): Open LED Status Pin. The OPENLED
pin asserts if the FB input is greater than the FB regulation
threshold minus 60mV (typical). The pin must have an
external pull-up resistor to function. When the PWM input
is low and the converter is idle, the OPENLED condition
is latched to the last valid state when the PWM input was
high. When the PWM input goes high again, the OPENLED
pin will be updated. This pin may be used to report an
open LED fault.
PWM (Pin 3): Pulse Width Modulated Input. A signal
low disables the oscillator and turns off the main switch.
PWM has an internal pull-down resistor. Tie PWM pin to
V
SHDN/UVLO (Pin 4): Shutdown and Undervoltage Lockout
Pin. An accurate 1.22V falling threshold with externally
programmable hysteresis detects when power is okay to
enable switching. Rising hysteresis is generated by the
external resistor divider and an accurate internal 2.2μA
pull-down current. Above the 1.25V (nominal) rising
threshold (but below 6V), SHDN/UVLO input bias current
is sub-μA. Below the falling threshold, a 2.2μA pull-down
current is enabled so the user can defi ne the hysteresis
with external resistor selection. Tie to 0.4V or less to dis-
able device and reduce V
Pin may be tied to V
than V
V
bypassed with a 1μF ceramic capacitor (or larger) placed
close to it.
6
REF
IN
(Pin 5): Input Supply Pin. This pin must be locally
if not used.
IN
if V
IN
is less than 6V.
IN
, but do not tie it to a voltage higher
IN
quiescent current below 1μA.
SW (Pin 6): Switch Pin. Connect the inductor at this pin.
Minimize the trace at this pin to reduce EMI.
ANODE (Pin 7): Internal Schottky Anode Pin.
CATHODE (Pin 10): Internal Schottky Cathode Pin.
ISP (Pin 11): Current Sense Resistor Positive Pin. This
input is the noninverting input of the internal current sense
amplifi er. Input bias current increases with V
increase.
ISN (Pin 12): Current Sense Resistor Negative Pin. This
input is the inverting input of the internal current sense
amplifi er.
FB (Pin 13): Voltage Loop Feedback Pin. It is used to
connect to output resistor divider for constant voltage
regulation or open LED protection. The internal trans-
conductance amplifi er will regulate FB to 1.22V (nominal)
through the DC/DC converter. If the FB input is regulating
the loop, the OPENLED pull-down is asserted. This action
may signal an open LED fault. Do not leave the FB pin
open. If not used, connect to GND.
CTRL (Pin 14): Current Sense Threshold Voltage Adjust-
ment Pin. This pin sets the threshold voltage across the
sense resistor between ISP and ISN. Connect directly to
the V
old of 250mV, or use a voltage between 0.1V and 1.0V to
linearly adjust the threshold. A voltage between 1.0V and
1.2V transitions to the full-scale threshold. Tie CTRL pin
to the V
V
pin can supply up to 100μA.
REF
REF
(Pin 15): Reference Output Pin. Typically 2V. This
REF
pin or a voltage above 1.2V for full-scale thresh-
pin if not used.
ISP
–V
3519fa
ISN