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MAX16833, MAX16833B, MAX16833C, MAX16833D, MAX16833E
High-Voltage HB LED Drivers with Integrated High-Side Current Sense
LED Driver Substantially Reduces Costs of EMI Filter, Load Dump Filter, and Short-Circuit Protection Components
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Status
Active: In Production.
Description
The MAX16833/MAX16833B/MAX16833C/MAX16833D/MAX16833E are peak current-mode-controlled LED drivers for boost, buck-boost, SEPIC, flyback, and high-side buck topologies. A dimming driver designed to drive an external p-channel in series with the LED string provides wide-range dimming control. This feature provides extremely fast PWM current switching to the LEDs with no transient overvoltage or undervoltage conditions. In addition to PWM dimming, the ICs provide analog dimming using a DC input at ICTRL. The ICs sense the LED current at the high side of the LED string.
A single resistor from RT/SYNC to ground sets the switching frequency from 100kHz to 1MHz, while an external clock signal capacitively coupled to RT/SYNC allows the ICs to synchronize to an external clock. In the MAX16833/MAX16833C/MAX16833E, the switching frequency can be dithered for spread-spectrum applications. The MAX16833B/MAX16833D instead provide a 1.64V reference voltage with a 2% tolerance.
The ICs operate over a wide 5V to 65V supply range and include a 3A sink/source gate driver for driving a power MOSFET in high-power LED driver applications. Additional features include a fault-indicator output (active-low FLT) for short or overtemperature conditions and an overvoltage-protection sense input (OVP) for overvoltage protection. High-side current sensing combined with a p-channel dimming MOSFET allow the positive terminal of the LED string to be shorted to the positive input terminal or to the negative input terminal without any damage. This is a unique feature of the ICs.
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Data Sheet
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An evaluation kit is available: MAX16833EVKIT
Key Features
- Boost, SEPIC, and Buck-Boost Single-Channel LED Drivers
- +5V to +65V Wide Input Voltage Range with a Maximum 65V Boost Output
- Integrated High-Side Current-Sense Amplifier
- ICTRL Pin for Analog Dimming
- Integrated High-Side pMOS Dimming MOSFET Driver (Allows Single-Wire Connection to LEDs)
- Programmable Operating Frequency (100kHz to 1MHz) with Synchronization Capability
- Frequency Dithering for Spread-Spectrum Applications (MAX16833/MAX16833C/MAX16833E)
- 2% Accurate 1.64V Reference (MAX16833B/MAX16833D)
- Full-Scale, High-Side, Current-Sense Voltage of 200mV
- Short-Circuit, Overvoltage, and Thermal Protection
- Fault Indicator Output
- -40°C to +125°C Operating Temperature Range
- Thermally Enhanced 5mm x 4.4mm, 16-Pin TSSOP Package with Exposed Pad
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Applications/Uses
- Automotive Exterior Lighting:
-High-Beam/Low-Beam/Signal/Position Lights
-Daytime Running Lights (DRLs)
-Fog Light and Adaptive Front Light Assemblies
- Commercial, Industrial, and Architectural
- Lighting
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Key Specifications:
| High Brightness LED Drivers |
| Part Number |
Topology |
Device VIN
(V) |
Device VIN
(V) |
LED Channels |
ILED per Channel
(A) |
LED String Volt.
(V) |
Internal Pwr. MOSFETs |
Freq.
(kHz) |
PWM Dimming Freq.
(kHz) |
PWM Dimming Ratio |
EV Kit |
Budgetary Price |
| max |
min |
max |
max |
max |
max |
max |
See Notes |
| MAX16833 |
| Boost/SEPIC | | Buck | | Buck-Boost |
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65 |
5 |
1 |
10 |
65 |
No |
1000 |
20 |
3000 |
Yes |
$2.24 @1k |
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See All High Brightness LED Drivers (29)
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Pricing 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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Diagram
Simplified Operating Circuit
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-5187
Rev 3;
2011-08-17
This page last modified: 2011-09-01
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