LT8393
60V , 100V Synchronous
IN
OUT
4-Switch Buck-Boost LED Driver
Controller with Low EMI
FEATURES
DESCRIPTION
The LT®8393 is a synchronous 4-switch buck-boost LED
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4-Switch Single Inductor Architecture Allows V
IN
controller that regulates LED current from input volt-
age above, below, or equal to the output voltage. The
proprietary peak-buck peak-boost current mode control
scheme allows adjustable and synchronizable 350kHz to
2MHz fixed frequency operation, or internal 25% triangle
spread spectrum operation for low EMI. With 4V to 60V
input, 0V to 100V output, and seamless low noise transi-
tions between operation regions, the LT8393 is ideal for
LEDdriverandbatterychargerapplicationsinautomotive,
industrial, and battery-powered systems.
Above, Below or Equal to V
Up to 95% Efficiency
OUT
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Proprietary Peak-Buck Peak-Boost Current Mode
Wide V Range: 4V to 60V
IN
Wide V
Range: 0V to 100V
OUT
4% LED Current Accuracy
2000:1 External and 128:1 Internal PWM Dimming
10V High Side PMOS PWM Switch Driver
No Top MOSFET Refresh Noise in Buck or Boost
Adjustable and Synchronizable: 350kHz to 2MHz
Flicker-Free Spread Spectrum for Low EMI
Open and Short LED Protection with Fault Reporting
AEC-Q100 Qualification in Progress
The LT8393 provides both internal (up to 128:1) and
external (up to 2000:1) LED current PWM dimming with
10V of high side PMOS gate drive. The CTRL pin provides
flexible 20:1 analog dimming with 4% LED current ac-
curacy at 100mV full scale. Fault protection is provided to
detect an open or short LED condition, during which the
LT8393 retries, latches off, or keeps running.
APPLICATIONS
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Automotive Head Lamps/Running Lamps
High Voltage LED Lighting
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All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
93% Efficient 24W (80V, 300mA) 350kHz Buck-Boost LED Driver
ꢀꢀꢁꢂ
10mΩ
ꢀ
ꢁꢂ
ꢃꢀ ꢄꢅ ꢆꢇꢀ
ꢀ.ꢁꢂꢃ
ꢄꢅꢆ
ꢇꢈ
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ꢀꢁꢂ.ꢃꢄꢅ
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ꢀꢀꢁꢂ
ꢀꢁꢂ
ꢀꢁꢂ ꢀꢁꢂ
ꢀꢁꢂꢃ
ꢀꢁꢂ
ꢀꢁꢂ
ꢀꢁꢂꢃ
Efficiency vs VIN
ꢀꢁꢁ
ꢀꢁ
ꢀꢁ
ꢀꢁ
ꢀꢁ
ꢀꢁ
ꢀꢁ
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ꢄꢄ
ꢀꢁꢂꢃ
ꢄꢄ
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ꢀꢁꢂ
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ꢀꢁꢂ
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ꢀꢁꢂꢃꢄꢃ
ꢀꢁꢂ
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ꢀꢁꢁꢂ
ꢁꢂꢃ
ꢀꢁꢂ
ꢀꢁꢂꢃꢄꢅꢆ
ꢀꢁ
ꢀꢀꢁꢂ ꢃꢁꢁ
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ꢀꢁꢂꢃꢄꢀꢅRꢆ
ꢀꢁ
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ꢀꢀ
ꢀꢁꢂ
ꢀ.ꢁꢂꢃ
ꢀꢁꢁꢂ
330mΩ
FAULT
AꢀAꢁꢂꢃ ꢄꢅꢆ
FAULT
ꢀꢁꢂ
ꢀ
ꢀ
ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ
ꢀꢁRꢂ
ꢀꢁꢂꢃꢄ
ꢀꢁꢂꢃꢄ ꢅꢆꢇꢄAꢈꢉ ꢊꢅꢋ
ꢀꢁꢁꢂ
ꢀꢁꢂꢁ ꢃAꢄꢅꢆ
ꢀ
Rꢀꢁ
ꢀ
ꢁꢂꢃ
ꢀꢁꢂ
ꢀꢁꢂ ꢃꢄꢂ
ꢀ.ꢁꢂꢃꢄ
Rꢀ
ꢀꢁꢁꢂ
ꢀꢀ
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Rꢀ
ꢀꢁ ꢂꢃ ꢄꢅꢁ
ꢆꢅꢅꢇA
ꢈꢉꢊꢋ
ꢀꢁꢂ
ꢀꢁꢁꢂ
ꢃꢄꢅꢂꢆꢇ
ꢀꢁꢂ
ꢀ.ꢁꢂ
ꢀꢁꢂꢃ
0.1μF
ꢀꢁꢂ
ꢃꢄꢅꢆꢇ
ꢀꢁꢂꢁ ꢃAꢄꢅꢆ
Rev. A
1
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