PM6600 STMicroelectronics, PM6600 Datasheet - Page 46

• Manufacturer Part Number: PM6600
• Description: IC LED DRIVR WHT BCKLT 24-VFQFPN
• Manufacturer: STMicroelectronics
• Type: Backlight, White LEDr

Specifications of PM6600

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 200kHz ~ 1MHz
• Voltage - Supply: 4.7 V ~ 28 V
• Voltage - Output: 36V
• Mounting Type: Surface Mount
• Package / Case: 24-VFQFN, 24-VFQFPN
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 32mA
• Internal Switch(s): Yes
• Number Of Segments: 60
• Operating Supply Voltage: 4.7 V to 28 V
• Maximum Power Dissipation: 2.3 W
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• For Use With: 497-8414 - BOARD EVAL BASED ON PM6600
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -
• Lead Free Status / Rohs Status: Details

Layout guidelines
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Top layer of the standard PM6600 demonstration board
While referring to the PM6600EVAL_EN demonstration board, the PGND and SGND
connections are more than one. In this case the PGND and SGND areas are separated in
the top layer (see Figure 1), while the bottom layer of the demonstration board is a unique
GND plane connected to SGND and PGND with the vias on the thermal pad and the vias
inside the test points.
Since the PM6600EVAL_EN demonstration board is an isolated system, there are no cross-
talking issues between the GNDs areas.
When the device is mounted on a LCD board, together with other devices (digital, analog
and power ones), it is very important to properly follow the layout guidelines listed above, in
order to dedicate to each device the PGND and SGND portion of the entire board.
In the picture below:
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Figure 54. Top layer critical signals components assembly and layout
COMP > green
Vin > dark blue
LX > blue
Vout > light blue
PGND > light yellow
SGND > dark yellow
Signal components
Doc ID 14248 Rev 7
Power components
PM6600