MAX16821BEVKIT+ Maxim Integrated Products, MAX16821BEVKIT+ Datasheet

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MAX16821BEVKIT+

Manufacturer Part Number
MAX16821BEVKIT+
Description
KIT EVAL FOR MAX16821B
Manufacturer
Maxim Integrated Products
Datasheets
1.MAX16821BATI.pdf (24 pages)
2.MAX16821BEVKIT.pdf (5 pages)

Specifications of MAX16821BEVKIT+

Current - Output / Channel
660mA
Outputs And Type
1, Non-Isolated
Voltage - Output
28V
Features
Dimmable
Voltage - Input
7 ~ 24V
Utilized Ic / Part
MAX16821
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX16821A/MAX16821B/MAX16821C pulse-
width-modulation (PWM) LED driver controllers provide
high output-current capability in a compact package
with a minimum number of external components. The
MAX16821A/MAX16821B/MAX16821C are suitable for
use in synchronous and nonsynchronous step-down
(buck), boost, buck-boost, SEPIC, and Cuk LED drivers. A
logic input (MODE) allows the devices to switch between
synchronous buck and boost modes of operation. These
devices are the first high-power drivers designed specifi-
cally to accommodate common-anode HBLEDs.
The ICs offer average current-mode control that enable
the use of MOSFETs with optimal charge and on-resis-
tance figure of merit, thus minimizing the need for
external heatsinking even when delivering up to 30A of
LED current.
The differential sensing scheme provides accurate con-
trol of the LED current. The ICs operate from a 4.75V to
5.5V supply range with the internal regulator disabled
(V
7V to 28V input supply voltage with the internal regula-
tor enabled.
The MAX16821A/MAX16821B/MAX16821C feature a
clock output with 180° phase delay to control a second
out-of-phase LED driver to reduce input and output fil-
ter capacitor size and to minimize ripple currents. The
wide switching frequency range (125kHz to 1.5MHz)
allows the use of small inductors and capacitors.
Additional features include programmable overvoltage
protection and an output enable function.
19-0881; Rev 2; 1/10
Typical Operating Circuit and Selector Guide appear 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.
CC
connected to IN). These devices operate from a
Front Projectors/Rear Projection TVs
Portable and Pocket Projectors
Automotive Exterior Lighting
LCD TVs and Display Backlight
Automotive Emergency Lighting and Signage
________________________________________________________________ Maxim Integrated Products
General Description
Drivers with Rapid Current Pulsing
Applications
High-Power Synchronous HBLED
♦ Up to 30A Output Current
♦ True-Differential Remote Output Sensing
♦ Average Current-Mode Control
♦ 4.75V to 5.5V or 7V to 28V Input-Voltage Range
♦ 0.1V/0.03V LED Current-Sense Options Maximize
♦ Thermal Shutdown
♦ Nonlatching Output Overvoltage Protection
♦ Low-Side Buck Mode with or without
♦ High-Side Buck and Low-Side Boost Mode with or
♦ 125kHz to 1.5MHz Programmable/Synchronizable
♦ Integrated 4A Gate Drivers
♦ Clock Output for 180° Out-of-Phase Operation for
♦ -40°C to +125°C Operating Temperature Range
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
MAX16821AATI+
MAX16821BATI+
MAX16821CATI+
Efficiency (MAX16821B/MAX16821C)
Synchronous Rectification
without Synchronous Rectification
Switching Frequency
Second Driver
EN
I.C.
OVI
CLP
PART
MAX16821
IN
PGND
CSP
DH
DL
Q1
Q2
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
Ordering Information
TEMP RANGE
7V TO 28V
HIGH-FREQUENCY
Simplified Diagram
PULSE TRAIN
R1
L1
C1
.
C2
Features
Q3
PIN-
PACKAGE
28 TQFN-EP*
28 TQFN-EP*
28 TQFN-EP*
V
LED
1

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MAX16821BEVKIT+ Summary of contents

Page 1

... LCD TVs and Display Backlight Automotive Emergency Lighting and Signage Typical Operating Circuit and Selector Guide appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. High-Power Synchronous HBLED ♦ ...

Page 2

High-Power Synchronous HBLED Drivers with Rapid Current Pulsing ABSOLUTE MAXIMUM RATINGS IN to SGND.............................................................-0.3V to +30V BST to SGND..........................................................-0.3V to +35V BST to LX..................................................................-0. ...........................................-0. PGND................................................-0. SGND............................................................-0.3V ...

Page 3

Drivers with Rapid Current Pulsing ELECTRICAL CHARACTERISTICS (continued 5V -40°C to +125°C, unless otherwise noted. Typical values are PARAMETER SYMBOL OSCILLATOR Switching Frequency ...

Page 4

High-Power Synchronous HBLED Drivers with Rapid Current Pulsing ELECTRICAL CHARACTERISTICS (continued 5V -40°C to +125°C, unless otherwise noted. Typical values are PARAMETER SYMBOL ...

Page 5

Drivers with Rapid Current Pulsing ELECTRICAL CHARACTERISTICS (continued 5V -40°C to +125°C, unless otherwise noted. Typical values are PARAMETER SYMBOL ENABLE INPUT (EN) ...

Page 6

High-Power Synchronous HBLED Drivers with Rapid Current Pulsing (V = 12V 5V +25°C, unless otherwise noted LOW-SIDE DRIVER (DL) SINK AND SOURCE CURRENT MAX16821A toc07 C = 22nF LOAD V ...

Page 7

Drivers with Rapid Current Pulsing PIN NAME 1 PGND Power-Supply Ground 2, 7 N.C. No Connection. Not internally connected Low-Side Gate-Driver Output Boost-Flying Capacitor Connection. Reservoir capacitor connection for the high-side MOSFET driver 4 BST supply. Connect a ...

Page 8

High-Power Synchronous HBLED Drivers with Rapid Current Pulsing Detailed Description The MAX16821A/MAX16821B/MAX16821C are high-per- formance average current-mode PWM controllers for high-power and high-brightness LEDs (HBLEDs). The average current-mode control technique offers inherently stable operation, reduces component derating and size by ...

Page 9

Drivers with Rapid Current Pulsing 0 +5V LDO V CC I.C. CLP CSP A = 34.5 V CSN LOW CLAMP OUTV CLK RT/SYNC OSCILLATOR RAMP CLKOUT GENERATOR ...

Page 10

High-Power Synchronous HBLED Drivers with Rapid Current Pulsing The MAX16821A/MAX16821B/MAX16821C synchronize to an external clock connected to RT/SYNC. The appli- cation of an external clock at RT/SYNC disables the internal oscillator. Once the MAX16821A/MAX16821B/ MAX16821C are synchronized to an external ...

Page 11

Drivers with Rapid Current Pulsing Current-Error Amplifier The MAX16821A/MAX16821B/MAX16821C include a transconductance current-error amplifier with a typical g of 550µS and 320µA output sink and source capa- m bility. The current-error amplifier output (CLP) is con- nected to the inverting ...

Page 12

High-Power Synchronous HBLED Drivers with Rapid Current Pulsing Voltage-Error Amplifier (VEA) The VEA sets the gain of the voltage control loop, and determines the error between the differential amplifier output and the internal reference voltage. The VEA out- put clamps ...

Page 13

Drivers with Rapid Current Pulsing Applications Information Boost LED Driver Figure 5 shows the MAX16821A/MAX16821B/MAX16821C configured as a synchronous boost converter with MODE connected During the on-time, the input CC voltage charges the inductor. During the off-time, ...

Page 14

High-Power Synchronous HBLED Drivers with Rapid Current Pulsing Input-Referenced Buck-Boost LED Driver The circuit in Figure 6 shows a step-up/step-down reg- ulator similar to the boost converter in Figure 5 in that the inductor is connected to the ...

Page 15

Drivers with Rapid Current Pulsing SEPIC LED Driver Figure 7 shows the MAX16821A/MAX16821B/ MAX16821C configured as a SEPIC LED driver. While buck topologies produce an output always lower than the input, and boost topologies produce an output always greater than ...

Page 16

High-Power Synchronous HBLED Drivers with Rapid Current Pulsing Low-Side Buck Driver with Synchronous Rectification In Figure 8, the input voltage goes from 7V to 28V and, because of the ground-based current-sense resistor, the output voltage can be as high as ...

Page 17

Drivers with Rapid Current Pulsing High-Side Buck Driver with Synchronous Rectification In Figure 9, the input voltage goes from 7V to 28V, the LED load is connected from the positive side to the current- sense resistor (R1) in series with ...

Page 18

High-Power Synchronous HBLED Drivers with Rapid Current Pulsing Inductor Selection The switching frequency, peak inductor current, and allowable ripple at the output determine the value and size of the inductor. Selecting higher switching frequen- cies reduces inductance requirements, but at ...

Page 19

Drivers with Rapid Current Pulsing Use low-ESR ceramic capacitors with high ripple-cur- rent capability at the input. In the case of the boost topology where the inductor is in series with the input, the ripple current in the capacitor is ...

Page 20

High-Power Synchronous HBLED Drivers with Rapid Current Pulsing Boost: × RAMP SW ≤ × × LED S The crossover frequency of the inner current loop is given by ...

Page 21

Drivers with Rapid Current Pulsing V LED R10 Q5 R9 PWM DIM Q4 C11 C10 PWM DIM Figure 11. Boost LED Driver with PWM Dimming Power Dissipation Calculate power dissipation in ...

Page 22

High-Power Synchronous HBLED Drivers with Rapid Current Pulsing Use the following guidelines to layout the LED driver. 1) Place the IN and close to the MAX16821A/MAX16821B/MAX16821C. 2) Minimize the area and length of the high-current ...

Page 23

Drivers with Rapid Current Pulsing V LED R9 R10 14 I.C. C11 15 OVI C10 R9 16 CLP R7 17 EAOUT C9 C8 EAN DIFF 20 CSN CSP 21 SGND SENSE- SENSE+ 22 For the latest package ...

Page 24

... 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. 24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products ...

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