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LM3492HCQMH/NOPB +BOM

Automotive high contrast 2-channel dimmable LED driver with boost converter and current regulator

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

LM3492HCQMH/NOPB
Datasheet:

LM3492HCQMH/NOPB Datasheet (PDF)
Number of channels:

2
Topology:

Boost with Current Sink
Rating:

Automotive
Operating temperature range (°C):

-40 to 125
EDA/CAD Models:

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LM3492HCQMH/NOPB General Description

The LM3492HC/-Q1 device integrates a boost converter and a two-channel current regulator to implement a highly efficient and cost effective LED driver. This device drives two individually dimmable LED strings with a maximum power of 15 W and an output voltage of up to 65 V. The boost converter employs a proprietary projected-on-time control method to give a fast transient response with no compensation required. The nearly constant switching frequency can be set to a level from 200 kHz to 1 MHz. Ceramic capacitors stabilize the application circuit and produce no audible noise on dimming. The programmable peak current limit and soft-start features reduce current surges at start-up. An integrated, 190-mΩ, 3.9-A, N-Channel MOSFET switch minimizes the solution size. The fast slew rate current regulator allows high frequency and narrow pulse width dimming signals to achieve a very high contrast ratio of 10000:1. The LED current can be set from 50 mA to 250 mA by a single resistor.

For all available packages, see the orderable addendum at the end of the data sheet.

All trademarks are the property of their respective owners.

To maximize the efficiency, (DHC) automatically adjusts the output voltage to a minimum. The DHC also facilitates a single BOM for different number of LED in a string, which is required for back-light panels of different size, thereby reducing overall development time and cost. The LM3492HC device includes a COMM pin that serves as a bidirectional I/O pin. The versatile COMM pin interface with an external micro-controller unit (MCU) is used for the following functions: power-good, overtemperature, IOUT overvoltage and undervoltage indications, switching frequency tuning, and channel 1 disabling. Other supervisory functions of the device include precise enable, VCC undervoltage lockout, current regulator over-power protection, and thermal shutdown protection. The device is available in the thermally enhanced PWP, 20-pin package.

Key Features

Boost Converter
- Automotive Grade Product, Q100 Grade-1 Qualified
- Very Wide Input Voltage Range: 4.5 V to 65 V
- Programmable Soft-Start Period
- No Loop Compensation Required
- Stable with Ceramic and Other Low ESR Capacitors with No Audible Noise
- Nearly Constant Switching Frequency Programmable from 200 kHz to 1 MHz
Current Regulator
- Programmable LED Current: 50 mA to 250 mA
- 10000:1 Contrast Ratio, 300-ns Minimum Pulse Width
- Two Individual Dimmable LED Strings up to 65 V, Total 15 W (Typically 28 LEDs at 150 mA)
- Dynamic Headroom Control Maximizes Efficiency
- Over-Power Protection
- ±3% Current Accuracy
Supervisory Functions
- Precision Enable
- COMM I/O Pin for Diagnostic and Commands
- Thermal Shutdown Protection
- Thermally Enhanced PWP, 20-Pin Package

Specifications

Number of channels	2	Topology	Boost with Current Sink
Rating	Automotive	Operating temperature range (°C)	-40 to 125
Vin (min) (V)	4.5	Vin (max) (V)	65
Vout (min) (V)	5	Vout (max) (V)	63
Iout (max) (A)	0.5	Iq (typ) (mA)	3.6
Switching frequency (max) (kHz)	1000	Features	Adjustable Switch Frequency, Enable/Shutdown, Integrated Switch, Power good, Soft Start, Thermal shutdown
feature-number-of-digits		feature-number-of-segments	28
feature-number-of-led-outputs		feature-topology
feature-process-technology		feature-input-output-type
feature-minimum-operating-supply-voltage-v	4.5	feature-maximum-operating-supply-voltage-v	65
feature-output-voltage-v	5 to 63	feature-maximum-supply-current-ua	5200
feature-maximum-output-current-ma		feature-maximum-power-dissipation-mw
feature-packaging	Tube	feature-rad-hard
feature-pin-count	20	feature-cecc-qualified	No
feature-esd-protection		feature-military	No
feature-aec-qualified	Yes	feature-aec-qualified-number	AEC-Q100
feature-auto-motive	Yes	feature-p-pap	Yes
feature-eccn-code	EAR99	feature-svhc	No
feature-svhc-exceeds-threshold	No