LTM8040IV#PBF Linear Technology, LTM8040IV#PBF Datasheet - Page 14

• Manufacturer Part Number: LTM8040IV#PBF
• Description: IC, LED DRIVER/CURRENT SOURCE, LGA-66
• Manufacturer: Linear Technology

Specifications of LTM8040IV#PBF

• Led Driver Application: Automotive, Avionic Lighting
• No. Of Outputs: 1
• Output Current: 1A
• Output Voltage: 13V
• Input Voltage: 4V To 36V
• Dimming Control Type: PWM
• Topology: Buck
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LTM8040
APPLICATION INFORMATION
Layout Hints
Most of the headaches associated with PCB layout have
been alleviated or even eliminated by the high level of
integration of the LTM8040. The LTM8040 is neverthe-
less a switching power supply, and care must be taken to
minimize EMI and ensure proper operation. Even with the
high level of integration, you may fail to achieve specifi ed
operation with a haphazard or poor layout. See Figure 6
for a suggested layout. Ensure that the grounding and heat
sinking are acceptable. A few rules to keep in mind are:
1. Place the C
14
and GND connection of the LTM8040.
IN
STRING
capacitor as close as possible to the V
LED
VIAS TO GND PLANE
LEDA
GND
Figure 6. Suggested Layout
IN
2. Connect all of the GND connections to as large a cop-
3. Use vias to connect the GND copper area to the board’s
4. If the application requires BIAS to be connected to the
per pour or plane area as possible on the top layer.
Avoid breaking the ground connection between the
external components and the LTM8040.
internal ground plane. Liberally distribute these GND
vias to provide both a good ground connection and
thermal path to the internal planes of the printed circuit
board.
input voltage potential, tie BIAS to V
not to break up the ground plane.
C
IN
V
IN
LPWR
BIAS
ADJ
RT
PWM
SHDN
8040 F06
IN
, but be careful
8040fa