PM6600
6-row 32 mA LED driver with boost regulator
for LCD panel backlight
Features
■
Boost section
– 4.7 V to 28 V input voltage range
– Internal power MOSFET
– Internal +5 V LDO for device supply
– Up to 36 V output voltage
– Constant frequency peak current-mode
control
– 200 kHz to 1 MHz adjustable switching
frequency
– External synchronization for multi-device
application
– Pulse-skip power saving mode at light load
– Programmable soft-start
– Programmable OVP protection
– Stable with ceramic output capacitors
– Thermal shutdown
Backlight driver section
– Six rows with 32 mA maximum current
capability (adjustable)
– Up to 10 WLEDs per row
– Unused rows detection
– 500 ns minimum dimming time (1 %
minimum dimming duty-cycle at 20 kHz)
– ±2.1 % current accuracy
– ±2 % current matching between rows
– LED failure (open and short circuit)
detection
VFQFPN-24 4x4
Description
The PM6600 consists of a high efficiency
monolithic boost converter and six controlled
current generators (ROWs), specifically designed
to supply LEDs arrays used in the backlight of
LCD panels. The device can manage a nominal
output voltage up to 36 V (i.e. 10 White-LEDs per
ROW). The generators can be externally
programmed to sink up to 32 mA and they can be
dimmed via a PWM signal (1% dimming duty-
cycle at 20 kHz can be managed). The device
allows to detect and manage the open and
shorted LED faults and to let unused ROWs
floating. Basic protections (Output Over-Voltage,
internal MOSFET Over-Current and Thermal
Shutdown) are provided.
■
Applications
■
■
Notebook monitors backlight
UMPC backlight
Device summary
Order codes
PM6600
VFQFPN-24 4x4 (exposed pad)
PM6600TR
Tape and reel
Package
Packaging
Tube
Table 1.
April 2008
Rev 3
1/43
STMICROELECTRONICS [ STMICROELECTRONICS ]
