MAX16819ATT+T-MAX16820ATT+-MAX16820ATT+T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX16819ATT+T-MAX16820ATT+-MAX16820ATT+T
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
Beneits and Features●Simple High-Power LED Lighting Design with
Accurate LED Current ControlOver 25W Output Power High-Side Current SenseAdjustable 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 CostHysteretic Control: No CompensationUp to 2MHz Switching Frequency 5V, 10mA On-Board Regulator
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
T = Tape and reel.
PARTTEMP
RANGE
PIN-
PACKAGE
TOP
MARK
MAX16819ATT+T-40°C to +125°C6 TDFN-EP*+ATB
MAX16820ATT+T40°C to +125°C6 TDFN-EP*+ATC
MAX16819
MAX16820
CSN
DIM
VCC
CIN
DRV
GND
CVCC
VINRSENSE354
DIM
CSN
GNDDRVV
MAX16819
MAX16820
TDFN
TOP VIEW
MAX16819/MAX168202MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
Typical Operating Circuit
Pin Coniguration
Ordering Information
EVALUATION KIT AVAILABLE
IN, CSN, DIM to GND ...........................................-0.3V to +30V
VCC, DRV to GND ..................................................-0.3V to +6V
CSN to IN .............................................................-0.3V to +0.3V
Maximum Current into Any Pin
(except IN, VCC, and DRV) ..........................................±20mA
Continuous Power Dissipation (TA = +70°C)
6-Pin TDFN (derate 18.17mW/°C* above +70°C) .....1454mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Pin-to-Pin ESD Ratings (HB Model)...................................2.5kV
*As per JEDEC51 Standard (Single-Layer Board).
(VIN = 12V, VDIM = VIN, CVCC = 1µF, RSENSE = 0.5Ω, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Input Voltage Range VIN4.528.0V
Maximum Current Regulator
Switching FrequencyfSW2MHz
Ground CurrentIGNDDRV open1.5mA
Supply CurrentIINVDIM < 0.6V425µA
Undervoltage LockoutUVLO
VIN = VCSN = VDIM, VIN rising from 4V until
VDRV > VCC - 0.5V4.75.0
VIN = VCSN = VDIM, VIN falling from 6V,
VDRV < 0.5V4.5
Undervoltage Lockout Hysteresis0.5V
SENSE COMPARATOR
Sense Voltage Threshold High VSNSHI
(VIN - VCSN) rising from 0V until VDRV <
0.5V (MAX16820)195210225
(VIN - VCSN) rising from 0V until VDRV <
0.5V (MAX16819)213230246
Sense Voltage Threshold Low VSNSLO
(VIN - VCSN) falling from 0.26V until VDRV >
(VCC - 0.5V) (MAX16820)176190204
(VIN - VCSN) falling from 0.26V until VDRV >
(VCC - 0.5V) (MAX16819)158170182
Propagation Delay to Output HightDPDHFalling edge of (VIN - VCSN) from 0.26V to
0V to DRV high, CDRV = 1nF82ns
Propagation Delay to Output LowtDPDLRising edge of (VIN - VCSN) from 0V to
0.26V to DRV low, CDRV = 1nF82ns
Current-Sense Input CurrentICSN(VIN - VCSN) = 200mV1µA
Current-Sense Threshold
HysteresisCSHYSMAX168195670mV
MAX168201735mV
MAX16819/MAX168202MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(VIN = 12V, VDIM = VIN, CVCC = 1µF, RSENSE = 0.5Ω, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
Note 1: All devices are 100% production tested at TJ = +25°C and +125°C. Limits to -40°C are guaranteed by design.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
GATE DRIVER
Gate Driver Source CurrentVCSN = VIN, VDRV = 0.5 x VCC0.5A
Gate Driver Sink CurrentVCSN = VIN - 250mV, VDRV = 0.5 x VCC1A
Gate Driver Output-Voltage HighVOHIDRV = 10mAVCC - 0.5V
Gate Driver Output-Voltage LowVOLIDRV = -10mA0.5V
DIM INPUT
Maximum DIM FrequencyfDIM20kHz
DIM Input-Voltage HighVIHVCSN = VIN, increase DIM until VDRV >
(VCC - 0.5V)2.8V
DIM Input-Voltage LowVILVCSN = VIN, decrease DIM until
VDRV < 0.5V 0.6V
DIM HysteresisDIMHYS200mV
DIM Turn-On TimetDIMONDIM rising edge to VDRV = 0.5 x VCC,
CDRV = 1nF100ns
DIM Turn-Off TimetDIMOFFDIM falling edge to VDRV = 0.5 x VCC,
CDRV = 1nF100ns
DIM Input Leakage HighVDIM = VIN10µA
DIM Input Leakage LowVDIM = 0V-1+1µA
VCC REGULATOR
Regulator Output VoltageVCCIVCC = 0.1mA to 10mA, VIN = 5.5V to 28V4.55.5V
IVCC = 0.1mA to 10mA, VIN = 4.5V to 28V4.05.5V
Load RegulationIVCC = 0.1mA to 10mA, VIN = 12V4Ω
Line RegulationVIN = 6V to 28V, IVCC = 10mA11mV
Power-Supply Rejection RatioPSRRVIN = 12V, IVCC = 5mA, fIN = 10kHz-35dB
Current LimitILIMVIN = 4.5V, VCC = 0V45mA
VIN = 4.5V, VCC = 4V18mA
Regulator Startup TimetSTARTVCC = 0 to 4.5V350µs
MAX16819/MAX168202MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
Electrical Characteristics (continued)
(VIN = VDIM = 12V, CVCC = 1µF, RSENSE = 0.5Ω connected between IN and CSN. Typical values at TA = +25°C, unless otherwise
noted.)
DRV SWITCHING FREQUENCY
vs. VIN
MAX16819 toc02
VIN (V)
DRV SWITCHING FREQUENCY (kHz)2016128
L = 47µH
LED 5
LED 4
LED 3
LED 1
LED 2
LED CURRENT VARIATION vs. VIN
MAX16819 toc03
VIN (V)
LED CURRENT VARIATION FROM SET CURRENT (%)25201015
LED 5LED 4LED 3
LED 2LED 1
ILED(NOMINAL) = 400mA
L = 47µH
VCC vs. VIN
MAX16819 toc04
VIN (V)
(V)
ILED = 0
VCC vs. TEMPERATURE
MAX16819 toc05
TEMPERATURE (°C)
(V)
VIN = 24V
VIN = 12V
VDIM = 0V
SUPPLY CURRENT vs. VIN
MAX16819 toc06
VIN (V)
SUPPLY CURRENT (µA)
VDIM = 0V
PWM DIMMING AT 200Hz
(10% DUTY CYCLE)
MAX16819 toc07
VDIM
2V/div
ILED
200mA/div
VIN = 12V, L = 47µH,
1 LED MAX16819
EFFICIENCY vs. VIN
MAX16819 toc01
VIN (V)
EFFICIENCY (%)201015
LED 5
LED 4
L = 47µH
PWM DIMMING AT 200Hz
(90% DUTY CYCLE)
MAX16819 toc08
VDIM
2V/div
ILED
200mA/div
VIN = 12V, L = 47µH,
1 LED MAX16819
MAX16819/MAX168202MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
Typical Operating Characteristics
(VIN = VDIM = 12V, CVCC = 1µF, RSENSE = 0.5Ω connected between IN and CSN. Typical values at TA = +25°C, unless otherwise
noted.)
PWM DIMMING AT 200Hz
(1% DUTY CYCLE)
MAX16819 toc09
10µs/div
VDIM
2V/div
ILED
200mA/div
VIN = 12V, L = 47µH,
1 LED MAX16819
PWM DIMMING EXPANDED
(50% DUTY CYCLE)
MAX16819 toc10
1µs/div
VDIM
2V/div
ILED
200mA/div
VIN = 24V, L = 33µH,
4 LEDS MAX16820
PWM DIMMING EXPANDED
(50% DUTY CYCLE)
MAX16819 toc11
4µs/div
VDIM
2V/div
ILED
200mA/div
VIN = 12V, L = 47µH,
1 LED MAX16819
PWM DIMMING AT 20kHz
(10% DUTY CYCLE)
MAX16819 toc12
10µs/div
VDIM
2V/div
ILED
200mA/div
VIN = 24V, L = 47µH,
4 LEDS MAX16820
PWM DIMMING AT 20kHz
(90% DUTY CYCLE)
MAX16819 toc13
10µs/div
VDIM
2V/div
ILED
200mA/div
VIN = 24V, L = 33µH,
4 LEDS MAX16820
ILED VARIATION vs. TEMPERATURE
MAX16819 toc14
TEMPERATURE (°C)
LED CURRENT VARIATION FROM SET CURRENT (%)11095-25-1053550652080
VIN = 24V
VIN = 12V
VDIM = 0V
ILED(NOMINAL) = 400mA
L = 47µH
MAX16819/MAX168202MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
Typical Operating Characteristics (continued)
Detailed Description
The MAX16819/MAX16820 are step-down, constant-
current, high-brightness LED (HB LED) drivers. These
devices operate from a 4.5V to 28V input voltage range
and provide up to 0.5A of source and 1A of sink drive
capability to the gate of an external MOSFET. A high-
dedicated PWM dimming input (DIM) allows for a wide
range of independent pulsed dimming.
The high-side current-sensing scheme and on-board
current-setting circuitry minimize the number of external
components while delivering LED current with a ±5%
accuracy, using a 1% sense resistor. See the Functional
PINNAMEFUNCTIONINPositive Supply Voltage Input. Bypass with a 1µF or higher value capacitor to GND.CSNCurrent-Sense Input DIMLogic-Level Dimming Input. Drive DIM low to turn off the current regulator. Drive DIM high to enable
the current regulator. GNDGroundDRVGate Drive Output. Connect to the gate of an external n-channel MOSFET.VCCVoltage Regulator Output. Connect a 1µF capacitor from VCC to GND.—Exposed Paddle. Connect to a large-area ground plane for improved power dissipation. Do not use
as the only ground connection for the device.
MAX16819
MAX16820
REGULATOR
COMPARATOR
UVLO
COMPARATOR
1.23V
BANDGAP
REF
GATE
DRIVER
DIM
BUFFER
VCC
DRV
GND
CSN
DIM
MAX16819/MAX168202MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
Pin Description
Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX16819ATT+T	MAIXM	N/a	2500	avai	2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming
MAX16820ATT+ \|MAX16820ATT	MAXIM	N/a	2	avai	2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming
MAX16820ATT+T \|MAX16820ATTT	MAXIM Pb-free	N/a	47445	avai	2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming