MAX16819_15 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming

MAX16819/MAX16820
EVALUATION KIT AVAILABLE
2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
General Description
The MAX16819/MAX16820, step-down constant-
current high-brightness LED (HB LED) drivers provide a
cost-effective solution for architectural and ambient
lighting, LED bulbs such as MR16 and other LED illumina-
tion applications.
The MAX16819/MAX16820 operate from a 4.5V to 28V
input voltage range and feature a 5V/10mA on-board
regulator. A high-side current-sense resistor adjusts the
output current and a dedicated PWM input (DIM) enables
a wide range of pulsed dimming.
The MAX16819/MAX16820 are well suited for applica-
tions requiring a wide input voltage range. The high-side
current-sensing and an integrated current-setting circuitry
minimize the number of external components while deliv-
ering an LED current with ±5% accuracy. A hysteretic
control algorithm ensures excellent input-supply rejection
and fast response during load transients and PWM dim-
ming. The MAX16819 features a 30% inductor current
ripple and the MAX16820 features a 10% current ripple.
These devices operate up to 2MHz switching frequency,
thus allowing for small component size.
The MAX16819/MAX16820 operate over the -40°C to
+125°C automotive temperature range and are available
in 3mm x 3mm x 0.8mm, 6-pin TDFN packages.
Applications
●● Architectural, Industrial, and Ambient Lighting
●● MR16 and Other LED Bulbs
●● Indicators and Emergency Lighting
Pin Configuration
TOP VIEW
6
5
4
Benefits and Features
●● Simple High-Power LED Lighting Design with
Accurate LED Current Control
• Over 25W Output Power
• High-Side Current Sense
• Adjustable Constant LED Current
• ±5% LED Current Accuracy
• 4.5V to 28V Input Voltage Range
●● Wide Dimming Range (5000:1)
• Dedicated Dimming-Control Input
• 20kHz Maximum Dimming Frequency
●● Minimizes Number of Components to Save Space
and Cost
• Hysteretic Control: No Compensation
• Up to 2MHz Switching Frequency
• 5V, 10mA On-Board Regulator
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
TOP
MARK
MAX16819ATT+T -40°C to +125°C 6 TDFN-EP*
MAX16820ATT+T 40°C to +125°C 6 TDFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
T = Tape and reel.
+ATB
+ATC
Typical Operating Circuit
V_IN
R_SENSE
L
C_IN
MAX16819
MAX16820
+
1
2
3
TDFN
C_VCC
IN
V_CC
MAX16819
CSN ^MAX16820 DRV
DIM
GND
19-0706; Rev 3; 2/15