The MAX16812 is a peak-current-mode LED driver with
an integrated 0.2Ω power MOSFET designed to control
the current in a single string of high-brightness LEDs
(HB LEDs). The MAX16812 can be used in multiple
converter topologies such as buck, boost, or buck-boost.
The MAX16812 operates over a 5.5V to 76V wide
supply voltage range.
The MAX16812 features a low-frequency, wide-range
brightness adjustment (100:1), analog and PWM dimming
control input, as well as a resistor-programmable
EMI suppression circuitry to control the rise and fall
times of the internal switching MOSFET. A high-side
LED current-sense amplifier and a dimming MOSFET
driver are also included, simplifying the design and
reducing the total component count.
The MAX16812 uses peak-current-mode control,
adjustable slope compensation that allows for additional
design flexibility. The device has two current regulation
loops. The first loop controls the internal switching
MOSFET peak current, while the second current regulation
loop controls the LED current. Switching frequency
can be adjusted from 125kHz to 500kHz.
Additional features include adjustable UVLO, soft-start,
external enable/disable input, thermal shutdown, a
1.238V 1% accurate buffered reference, and an on-chip
oscillator. An internal 5.2V linear regulator supplies
up to 20mA to power external devices.
The MAX16812 is available in a thermally enhanced
5mm x 5mm, 28-pin TQFN-EP package and is specified
over the automotive -40°C to +125°C temperature range.
Key Features
Applications/Uses
Integrated 76V, 0.2Ω (typ) Power MOSFET
5.5V to 76V Wide Input Range
Adjustable LED Current with 5% Accuracy
Floating Differential LED Current-Sense Amplifier
Floating Dimming N-Channel MOSFET Driver
PWM LED Dimming with:
PWM Control Signal
Analog Control Signal
Chopped VIN Input
Peak-Current-Mode Control
125kHz to 500kHz Adjustable Switching Frequency
Adjustable UVLO and Soft-Start
Output Overvoltage Protection
5µs LED Current Rise/Fall Times During Dimming
Minimize EMI
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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