ISL78419_15 Datasheet, PDF (1/20 Pages) Intersil Corporation – Integrated Automotive TFT-LCD Power Supply Regulator

DATASHEET
Integrated Automotive TFT-LCD Power Supply Regulator
ISL78419
The ISL78419 is an integrated power management IC (PMIC) for
TFT-LCDs used in central display, rear seat entertainment and
virtual dashboards. The device integrates a boost converter for
generating AV_DD, an LDO regulator for V_LOGIC. V_ON and V_OFF are
generated by a charge pump driven by the switch node of the
boost converter. The ISL78419 also includes a V_ON slice circuit,
reset function, and a high performance VCOM amplifier with a
Digitally Controlled Potentiometer (DCP) that is used as a VCOM
calibrator.
The AV_DD boost converter features a 1.5A/0.18Ωboost FET with
600kHz/1200kHz switching frequency.
The integrated logic LDO includes a 350mA FET for driving the low
voltage needed by external digital circuitry.
The gate pulse modulator can control the gate voltage up to 30V,
and both the rate and slew delay times are selectable.
The supply monitor generates a reset signal when the system is
powered down based on a user selected threshold level
(programming resistor).
The ISL78419 provides a digitally controlled VCOM output using
I²C interface. One VCOM amplifier is also integrated in the chip to
provide a fast slewing 150mA drive (sourcing or sinking). The
output of the VCOM is powered up with the voltage stored at the
last programmed 8-bit (internal) EEPROM setting.
The ISL78419 is rated to operate over the temperature range
of (-40°C to +105°C) and is qualified according to AEC-Q100.
Features
• 2.5V to 5.5V input
• 1.5A, 0.18Ω integrated boost FET
• V_ON/V_OFF supplies generated by charge pumps driven by the
boost switch node
• LDO for V_LOGIC channel
• 600kHz/1200kHz selectable switching frequency
• Integrated gate pulse modulator
• Reset signal generated by supply monitor
• Integrated VCOM amplifier
• DCP
- I²C serial interface, address: 0101000, MSB left
- Wiper position stored in 8-bit nonvolatile memory and
recalled on power-up
- Endurance, 1,000 data changes per bit
• UVLO, UVP, OVP, OCP, and OTP protection
• Pb-free (RoHS compliant)
• 28 Ld 4x5 QFN
• AEC-Q100 qualified
Applications
• Automotive TFT displays
- Central displays, rear seat entertainment and dashboards
Pin Configuration
ISL78419 (28 LD 4x5 QFN)
TOP VIEW
28
FB 1
PGND 2
CE 3
RE 4
VGH 5
VGHM 6
VFLK 7
VDPM ₈
27 26 25 24
GND
THERMAL
PAD
23
22 L_IN
21 CD2
20 L_OUT
19 RESET
18 ADJ
17 VDIV
16 NEG
15 VOUT
9 10 11 12 13 14
June 27, 2014
1
FN8292.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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