MAX16822AASA+ Maxim Integrated Products, MAX16822AASA+ Datasheet

IC LED DRIVER HIGH BRIGHT 8-SOIC

MAX16822AASA+

Manufacturer Part Number
MAX16822AASA+
Description
IC LED DRIVER HIGH BRIGHT 8-SOIC
Manufacturer
Maxim Integrated Products
Type
HBLED Driverr
Datasheet

Specifications of MAX16822AASA+

Constant Current
Yes
Topology
PWM, Step-Down (Buck)
Number Of Outputs
1
Internal Driver
Yes
Type - Primary
Automotive
Type - Secondary
High Brightness LED (HBLED)
Frequency
2MHz
Voltage - Supply
6.5 V ~ 65 V
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Operating Temperature
-40°C ~ 125°C
Current - Output / Channel
350mA
Internal Switch(s)
Yes
Operating Supply Voltage
6 V to 65 V
Maximum Supply Current
1.5 mA
Maximum Power Dissipation
588.2 mW
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
Efficiency
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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.
Integrated MOSFET and High-Side Current Sense
19-4141; Rev 3; 1/10
Pin Configuration appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Architectural, Industrial, and Ambient Lighting
Automotive RCL, DRL, and Fog Lights
Heads-Up Displays
Indicator and Emergency Lighting
________________________________________________________________ Maxim Integrated Products
2MHz, High-Brightness LED Drivers with
General Description
Applications
♦ High-Efficiency Solution
♦ 6.5V to 65V Input-Voltage Range
♦ Output Current Up to 500mA
♦ On-Board 65V, 0.85Ω Power MOSFET
♦ Hysteretic Control: Up to 2MHz Switching
♦ ±3% LED Current Accuracy
♦ 200mV Current-Sense Reference
♦ Resistor-Programmable Constant LED Current
♦ Integrated High-Side Current Sense
♦ Thermal-Foldback Protection/Linear Dimming
♦ Thermal-Shutdown Protection
♦ Available in an 8-Pin SO Package
♦ -40°C to +125°C Operating Temperature Range
+ Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
MAX16822AASA+
MAX16822AASA/V+
MAX16822BASA+
V
C1
IN
Frequency
PART
R
SENSE
1
2
3
4
Typical Application Circuit
CS
IN
GND
PGND
MAX16822A
MAX16822B
HB LEDs
D1
Ordering Information
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
TEMP RANGE
TEMP_I
DIM
LX
LX
8
7
6
5
L1
NTC *
PIN-PACKAGE
8 SO
8 SO
8 SO
C2
Features
* OPTIONAL
ON
OFF
1

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MAX16822AASA+ Summary of contents

Page 1

... Resistor-Programmable Constant LED Current ♦ Integrated High-Side Current Sense ♦ Thermal-Foldback Protection/Linear Dimming ♦ Thermal-Shutdown Protection ♦ Available in an 8-Pin SO Package ♦ -40°C to +125°C Operating Temperature Range PART MAX16822AASA+ MAX16822AASA/V+ MAX16822BASA+ + Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part ...

Page 2

High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense ABSOLUTE MAXIMUM RATINGS 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. .................................................................-0.3V to ...

Page 3

High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense ELECTRICAL CHARACTERISTICS (continued +24V -40°C to +125°C, unless otherwise noted. Typical values are DIM IN A ...

Page 4

High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense ( 48V 1µ DIM VCC SENSE unless otherwise noted.) NORMALIZED I LED vs 1.10 1.05 5 LEDs 7 LEDs 9 ...

Page 5

High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense ( 48V 1µ DIM VCC SENSE unless otherwise noted.) LX RDSON vs. TEMPERATURE 1 0.9 0 48V IN ...

Page 6

High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense IN I SET V _ANA CC CS BANDGAP REFERENCE DIM DIM BUFFER V CC TEMP_I V TFB_ON 2V Figure 1. Internal Block Diagram 6 _______________________________________________________________________________________ V CC REGULATOR V ...

Page 7

High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense Undervoltage Lockout (UVLO) The MAX16822A/MAX16822B include UVLO with 500mV hysteresis. The internal MOSFET turns off when V falls below 5.5V to 6.0V. IN LED dimming is achieved by applying ...

Page 8

High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense HYSTERETIC MODE I LED AVG. LED CURRENT V DIM t1 Figure 2. Current-Regulator Operation Freewheeling-Diode Selection For stability and best efficiency, a low forward-voltage drop diode with fast reverse-recovery ...

Page 9

High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense Pin Configuration TOP VIEW + MAX16822A MAX16822B GND 3 PGND 4 SO _______________________________________________________________________________________ PROCESS: BiCMOS 8 TEMP_I For the latest package outline information and land ...

Page 10

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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