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MAX16822BASA+

P1-P3P4-P6P7-P9P10-P10
MAX16822A/MAX16822B
2MHz, High-Brightness LED
Drivers with Integrated MOSFET
and High-Side Current Sense
EVALUATION KIT AVAILABLE
General Description
The MAX16822A/MAX16822B step-down constant-cur-
rent high-brightness LED (HB LED) drivers provide a
cost-effective design solution for automotive
interior/exterior lighting, architectural and ambient light-
ing, LED bulbs, and other LED illumination applications.
The MAX16822A/MAX16822B operate from a +6.5V to
+65V input-voltage range and can provide an output
current up to 350mA, if operated up to a temperature of
+125°C, or up to 500mA, if operated up to a tempera-
ture of +105°C. A high-side current-sense resistor
adjusts the output current and a dedicated pulse-width
modulation (PWM) input enables pulsed LED dimming
over a wide range of brightness levels.
These devices are well suited for applications requiring
a wide input-voltage range. The high-side current sens-
ing and an integrated current-setting circuitry minimize
the number of external components while delivering an
average output current with ±3% accuracy. A hysteretic
control method ensures excellent input supply rejection
and fast response during load transients and PWM dim-
ming. The MAX16822A allows 10% current ripple and
the MAX16822B allows 30% current ripple. Both
devices operate up to a switching frequency of 2MHz,
thus allowing the use of small-sized components.
The MAX16822A/MAX16822B offer an analog dimming
feature that reduces the output current by applying an
external DC voltage below the internal 2V threshold volt-
age from TEMP_I to GND. TEMP_I also sources 25µA to
a negative temperature coefficient (NTC) thermistor con-
nected between TEMP_I and GND, thus providing an
analog thermal-foldback feature that reduces the LED
current when the temperature of the LED string exceeds
a specified temperature point.
An additional feature includes thermal-shutdown pro-
tection that turns off the LX driver when the junction
temperature exceeds +165°C.
The MAX16822A/MAX16822B operate over the -40°C to
+125°C automotive temperature range and are available
in an 8-pin SO package.
Applications
Architectural, Industrial, and Ambient Lighting
Automotive RCL, DRL, and Fog Lights
Heads-Up Displays
Indicator and Emergency Lighting
Benefits and Features
• Cost-Effective Solution for Wide Range of LED
Lighting Applications
• 6.5V to 65V Input Voltage Range
• Output Current Up to 500mA
• ±3% LED Current Accuracy
• Selectable Dimming Options: Linear or PWM
• Minimal Component Count Saves Cost and Space
• On-Board 65V, 0.85Ω Power MOSFET
• Resistor-Programmable Constant LED Current
• Integrated High-Side Current Sense with 200mV
Current-Sense Reference
• Hysteretic Control: Up to 2MHz Switching
Frequency
• Protection Features and Wide Operating
Temperature Range Improves Reliability
• Thermal-Foldback Protection Dims LEDs to
Minimize Overheating
• Thermal-Shutdown Protection
• Available in an 8-Pin SO Package
• Operation Over -40°C to +125°C Temperature
Range
Ordering Information
LX
LXPGND
1
2
8
7
TEMP_I
DIMIN
GND
CS
3
4
6
5
MAX16822A
MAX16822B
L1
C2
ON
OFF
D1
HB LEDs
NTC
*
*
OPTIONAL
R
SENSE
V
IN
C1
Typical Application Circuit
+
Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
PART TEMP RANGE PIN-PACKAGE
MAX16822AASA+ -40°C to +125°C 8 SO
MAX16822AASA/V+ -40°C to +125°C 8 SO
MAX16822BASA+ -40°C to +125°C 8 SO
Pin Configuration appears at end of data sheet.
19-4141; Rev 4; 2/15
MAX16822A/MAX16822B
2MHz, High-Brightness LED
Drivers with Integrated MOSFET
and High-Side Current Sense
Maxim Integrated | 2www.maximintegrated.com
Absolute Maximum Ratings
Electrical Characteristics
(V
IN
= +24V, V
DIM
= V
IN
, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
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.
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, see www.maximintegrated.com/thermal-tutorial
.
IN, CS, LX, DIM to GND .........................................-0.3V to +70V
TEMP_I to GND .......................................................-0.3V to +6V
PGND to GND ......................................................-0.3V to +0.3V
CS to IN .................................................................-0.3V to +0.3V
Maximum Current into Any Pin
(except IN, LX, and PGND).............................................20mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 7.4mW/°C above +70°C)...............588.2mW
Junction-to-Ambient Thermal Resistance (θ
JA
) (Note 1) ...136°C/W
Pin-to-Pin ESD Ratings......................................................±2.5kV
Operating Temperature Range
350mA (max) Output Current ........................-40°C to +125°C
500mA (max) Output Current ........................-40°C to +105°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input-Voltage Range V
IN
6.5 65 V
Ground Current No switching 1.5 mA
Supply Current V
DIM
< 0.6V, V
IN
= 12V 350 μA
UNDERVOLTAGE LOCKOUT (UVLO)
V
CS
= V
IN
- 100mV, V
IN
rising from 4V
until V
LX
< 0.5V
IN
6.25 6.5
Undervoltage Lockout UVLO
V
CS
= V
IN
- 100mV, V
IN
falling from 6.5V
until V
LX
> 0.5V
IN
6
V
Undervoltage-Lockout Hysteresis 0.5 V
SENSE COMPARATOR
MAX16822A, V
IN
- V
CS
rising from 140mV
until V
LX
> 0.5V
IN
201 210 216
Sense Voltage Threshold High V
SNSHI
MAX16822B, V
IN
- V
CS
rising from 140mV
until V
LX
> 0.5V
IN
218 230 236
mV
MAX16822A, V
IN
- V
CS
falling from
260mV until V
LX
< 0.5V
IN
185 190 198
Sense Voltage Threshold Low V
SNSLO
MAX16822B, V
IN
- V
CS
falling from
260mV until V
LX
< 0.5V
IN
166 170 180
mV
Propagation Delay to Output High t
DPDH
Falling edge of V
IN
- V
CS
from 140mV to
260mV to V
LX
> 0.5V
IN
50 ns
Propagation Delay to Output Low t
DPDL
Rising edge of V
CS
- V
IN
from 260mV to
140mV to V
LX
< 0.5V
IN
50 ns
CS Input Current I
CSIN
V
IN
- V
CS
= 200mV 3.5 μA
MAX16822A/MAX16822B
2MHz, High-Brightness LED
Drivers with Integrated MOSFET
and High-Side Current Sense
Maxim Integrated | 3www.maximintegrated.com
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INTERNAL MOSFET
V
IN
= V
DIM
= 24V, V
CS
= 23.9V,
I
LX
= 350mA
0.85 1.7
Drain-to-Source Resistance R
DSON
V
IN
= V
DIM
= 6.0V, V
CS
= 5.9V,
I
LX
= 350mA
1 2
LX Leakage Current I
LX_LEAK
V
DIM
= 0V, V
LX
= 65V 10 μA
DIM INPUT
DIM Input-Voltage High V
IH
V
IN
- V
CS
= 100mV 2.8 V
DIM Input-Voltage Low V
IL
V
CS
- V
IN
= 100mV 0.6 V
DIM Turn-On Time t
DIM_ON
V
DIM
rising edge to V
LX
< 0.5V
IN
200 ns
DIM Input Leakage High V
DIM
= V
IN
15 μA
DIM Input Leakage Low V
DIM
= 0V -3 0 μA
THERMAL SHUTDOWN
Thermal-Shutdown Threshold Temperature rising 165 °C
Thermal-Shutdown Threshold
Hsysteresis
10 °C
THERMAL FOLDBACK
Thermal-Foldback Enable
Threshold Voltage
V
TFB_ON
V
DIM
= 5V 1.9 2.0 2.12 V
Thermal-Foldback Slope FB
SLOPE
V
DIM
= 5V 0.75 1/V
TEMP_I Output Bias Current I
TEMP_I
25 26.5 28 μA
Electrical Characteristics (continued)
(V
IN
= +24V, V
DIM
= V
IN
, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
EFFICIENCY
vs. V
IN
MAX16822A toc01
V
IN
(V)
EFFICIENCY (%)
5545352515
75
80
85
90
95
100
70
565
1 LED
3 LEDs
5 LEDs
7 LEDs
9 LEDs
11 LEDs
13 LEDs
15 LEDs
9 LEDs
DUTY CYCLE
vs. V
IN
MAX16822A toc02
V
IN
(V)
DUTY CYCLE (%)
5545352515
10
20
30
40
50
60
70
80
90
100
0
565
1 LED
3 LEDs
5 LEDs
7 LEDs
15 LEDs
11 LEDs
13 LEDs
FREQUENCY
vs. V
IN
MAX16822A toc03
V
IN
(V)
FREQUENCY (kHz)
5545352515
10
20
30
40
50
60
70
80
90
100
0
565
1 LED
3 LEDs
5 LEDs
7 LEDs
9 LEDs
11 LEDs
13 LEDs
15 LEDs
Typical Operating Characteristics
(V
IN
= V
DIM
= 48V, C
VCC
= 1µF, R
SENSE
= 0.62Ω, L = 220µH (connected between IN and CS). Typical values are at T
A
= +25°C,
unless otherwise noted.)
P1-P3P4-P6P7-P9P10-P10

MAX16822BASA+

Mfr. #:
Buy MAX16822BASA+
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers 2MHz HB w/MOSFET & HSide Crnt Sense
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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