MAX16834ATP/V+ Maxim Integrated Products, MAX16834ATP/V+ Datasheet

IC LED DRIVR HIGH BRIGHT 20-TQFN

MAX16834ATP/V+

Manufacturer Part Number
MAX16834ATP/V+
Description
IC LED DRIVR HIGH BRIGHT 20-TQFN
Manufacturer
Maxim Integrated Products
Type
HBLED Driverr
Datasheet

Specifications of MAX16834ATP/V+

Topology
PWM, SEPIC, Step-Down (Buck), Step-Up (Boost)
Number Of Outputs
1
Internal Driver
No
Type - Primary
Automotive, Backlight
Type - Secondary
High Brightness LED (HBLED), RGB
Frequency
100kHz ~ 1MHz
Voltage - Supply
4.75 V ~ 28 V
Mounting Type
Surface Mount
Package / Case
20-TQFN Exposed Pad
Operating Temperature
-40°C ~ 125°C
Internal Switch(s)
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
Current - Output / Channel
-
Efficiency
-
Lead Free Status / Rohs Status
 Details
The MAX16834 is a current-mode high-brightness LED
(HB LED) driver for boost, boost-buck, SEPIC, and high-
side buck topologies. In addition to driving an n-channel
power MOSFET switch controlled by the switching con-
troller, it also drives an n-channel PWM dimming switch to
achieve LED PWM dimming. The MAX16834 integrates
all the building blocks necessary to implement a fixed-fre-
quency HB LED driver with wide-range dimming control.
The MAX16834 features constant-frequency peak cur-
rent-mode control with programmable slope compensa-
tion to control the duty cycle of the PWM controller.
A dimming driver designed to drive an external n-chan-
nel MOSFET in series with the LED string provides
wide-range dimming control up to 20kHz. In addition to
PWM dimming, the MAX16834 provides analog dim-
ming using a DC input at REFI. The programmable
switching frequency (100kHz to 1MHz) allows design
optimization for efficiency and board space reduction.
A single resistor from RT/SYNC to ground sets the
switching frequency from 100kHz to 1MHz while an
external clock signal at RT/SYNC disables the internal
oscillator and allows the MAX16834 to synchronize to
an external clock. The MAX16834’s integrated high-
side current-sense amplifier eliminates the need for a
separate high-side LED current-sense amplifier in
boost-buck applications.
The MAX16834 operates over a wide supply range of
4.75V to 28V and includes a 3A sink/source gate driver
for driving a power MOSFET in high-power LED driver
applications. It can also operate at input voltages
greater than 28V in boost configuration with an external
voltage clamp. The MAX16834 is also suitable for DC-
DC converter applications such as boost or boost-
buck. Additional features include external enable/
disable input, an on-chip oscillator, fault indicator out-
put (FLT) for LED open/short or overtemperature condi-
tions, and an overvoltage protection sense input
(OVP+) for true overvoltage protection.
The MAX16834 is available in a thermally enhanced
4mm x 4mm, 20-pin TQFN-EP package and in a thermal-
ly enhanced 20-pin TSSOP-EP package and is specified
over the automotive -40°C to +125°C temperature range.
19-4235; Rev 3; 1/10
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 LED Driver with Integrated High-Side LED
Single-String LED LCD Backlighting
Automotive Rear and Front Lighting
Projection System RGB LED Light Sources
Architectural and Decorative Lighting (MR16, M111)
Spot and Ambient Lights
DC-DC Boost/Boost-Buck Converters
Current Sense and PWM Dimming MOSFET Driver
________________________________________________________________ Maxim Integrated Products
General Description
Applications
o Wide Input Operating Voltage Range (4.75V to
o Works for Input Voltage > 28V with External
o 3000:1 PWM Dimming/Analog Dimming
o Integrated PWM Dimming MOSFET Driver
o Integrated High-Side Current-Sense Amplifier for
o 100kHz to 1MHz Programmable High-Frequency
o External Clock Synchronization Input
o Programmable UVLO
o Internal 7V Low-Dropout Regulator
o Fault Output (FLT) for Overvoltage, Overcurrent,
o Programmable True Differential Overvoltage
o 20-Pin TQFN-EP and TSSOP-EP Packages
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
/V denotes an automotive qualified part.
Pin Configurations appear at end of data sheet.
MAX16834ATP+
MAX16834ATP/V+
MAX16834AUP+
MAX16834AUP/V+
OFF
28V)
Voltage Clamp on V
LED Current Sense in Boost-Buck Converter
Operation
and Thermal Warning Faults
Protection
V
IN
ANALOG
ON
PART
DIM
Simplified Application Circuit
PWMDIM
PGND
IN
REFI
MAX16834
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
BOOST LED DRIVER
Ordering Information
TEMP RANGE
IN
DIMOUT
SENSE+
for Boost Converter
NDRV
CS
PIN-PACKAGE
20 TQFN-EP*
20 TQFN-EP*
20 TSSOP-EP*
20 TSSOP-EP*
Features
LED+
LED-
LEDs
1

Related parts for MAX16834ATP/V+

MAX16834ATP/V+ Summary of contents

Page 1

... Internal 7V Low-Dropout Regulator o Fault Output (FLT) for Overvoltage, Overcurrent, and Thermal Warning Faults o Programmable True Differential Overvoltage Protection o 20-Pin TQFN-EP and TSSOP-EP Packages PART MAX16834ATP+ MAX16834ATP/V+ MAX16834AUP+ MAX16834AUP/V+ + Denotes a lead(Pb)-free/RoHS-compliant package Exposed pad. /V denotes an automotive qualified part. Simplified Application Circuit V ...

Page 2

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver ABSOLUTE MAXIMUM RATINGS IN, HV SGND................................................-0.3V to +30V OVP+, SENSE+, DIMOUT, CLV to SGND ..............-0.3V to +30V SENSE+ to LV........................................................-0.3V to +0.3V HV, IN ...

Page 3

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver ELECTRICAL CHARACTERISTICS (continued 12V 5V UVEN 10kΩ -40°C to +125°C, ...

Page 4

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver ELECTRICAL CHARACTERISTICS (continued 12V 5V UVEN 10kΩ -40°C to +125°C, ...

Page 5

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver ( 12V 5V UVEN 10kΩ +25°C, unless otherwise noted vs. ...

Page 6

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver ( 12V 5V UVEN 10kΩ +25°C, unless otherwise noted vs. ...

Page 7

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver PIN NAME TQFN TSSOP FLT Active-Low, Open-Drain Fault Indicator Output. See the Fault Indicator ( FLT ) section Resistor-Programmable Switching Frequency Setting/Sync Control Input. ...

Page 8

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver IN REFERENCE SGND UVEN UVLO V BG RT/SYNC OSC SC 5kΩ CS BLANK NDRVB V REF REFI LPF SENSE 9 COMP ...

Page 9

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver The MAX16834 is also suitable for DC-DC converter applications such as boost or boost-buck (Figures 6 and 7). Other applications include boost LED drivers with automotive ...

Page 10

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver Internal Transconductance Error Amplifier The MAX16834 has a built-in transconductance amplifi- er used to amplify the error signal inside the feedback loop. The amplified current-sense signal ...

Page 11

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver Figure 2. Boost LED Driver Programming the LED Current The LED current is programmed using the ...

Page 12

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver I LED = IL AVG − MAX Allowing the peak-to-peak inductor ripple (ΔI ±30% of the average inductor current: ΔI = × ...

Page 13

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver Figure 3. Boost-Buck LED Driver (V LED+ ESR and the bulk capacitance are equal, allowing 50% ...

Page 14

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver configuration, the input current is the inductor current minus the LED current. But for both configurations, the ripple current that the input filter capacitor has to ...

Page 15

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver lowing equation. The MOSFET must be mounted on a board as per manufacturer specifications to dissipate the heat. The RMS current rating of the switching MOSFET ...

Page 16

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver Boost configuration LED = R OUT + × LED Boost-buck configuration ...

Page 17

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver 24V Figure 4. Boost LED Driver with Automotive Load Dump Protection ______________________________________________________________________________________ LV ...

Page 18

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver Figure 5. High-Side Buck LED Driver 18 ______________________________________________________________________________________ NDRV UVEN CS ...

Page 19

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver Figure 6. Boost DC-DC Converter ______________________________________________________________________________________ FLT NDRV UVEN HV CS MAX16834 ...

Page 20

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver Figure 7. Boost-Buck DC-DC Converter 20 ______________________________________________________________________________________ NDRV UVEN SC CS ...

Page 21

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver Layout Recommendations Typically, there are two sources of noise emission in a switching power supply: high di/dt loops and high dv/dt surfaces. For example, traces that ...

Page 22

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver TOP VIEW CLV 17 18 DIMOUT MAX16834 LV 19 SENSE TQFN *EP = EXPOSED PAD. Chip ...

Page 23

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 23 © 2010 Maxim Integrated Products ...

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