MAX16838ATP/V+ Maxim Integrated, MAX16838ATP/V+ Datasheet

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MAX16838ATP/V+

Manufacturer Part Number
MAX16838ATP/V+
Description
LED Lighting Drivers Integrated 2-Channel High-Brightness LED Drivers with High-Voltage DC-DC Controller
Manufacturer
Maxim Integrated
Datasheet
1.MAX16838ATPVT.pdf (21 pages)

Specifications of MAX16838ATP/V+

Input Voltage
4.75 V to 40 V
Maximum Supply Current
3.1 mA
Power Dissipation
2051 mW
19-4972; Rev 2; 4/11
Integrated, 2-Channel, High-Brightness LED Driver
The
grates both the DC-DC switching boost regulator and
two 150mA current sinks. A current-mode switching
DC-DC controller provides the necessary voltage to
both strings of HB LEDs. The MAX16838 accepts a wide
4.75V to 40V input voltage range and directly withstands
automotive load-dump events. For a 5V Q10% input volt-
age, connect V
powering HB LEDs for small-to-medium-sized LCD dis-
plays in automotive and display backlight applications.
An internal current-mode switching DC-DC controller
supports the boost or SEPIC topologies and operates
in an adjustable frequency range between 200kHz and
2MHz. The current-mode control provides fast response
and simplifies loop compensation. The MAX16838 also
features an adaptive output-voltage adjustment scheme
that minimizes the power dissipation in the LED current
sink paths. The MAX16838 can be combined with the
MAX15054 to achieve a buck-boost LED driver with two
integrated current sinks.
The channel current is adjustable from 20mA to 150mA
using an external resistor. The external resistor sets both
channel currents to the same value. The device allows
connecting both strings in parallel to achieve a maximum
current of 300mA in a single channel. The MAX16838
also features pulsed dimming control with minimum
pulse widths as low as 1Fs, on both channels through a
logic input (DIM).
The MAX16838 includes an output overvoltage protec-
tion, open LED, shorted LED detection and overtempera-
ture protection. The device operates over the -40NC to
+125NC automotive temperature range. The MAX16838
is available in the 20-pin TSSOP and 4mm x 4mm, 20-pin
TQFN packages.
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.
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
MAX16838 is a dual-channel LED driver that inte-
Automotive Display Backlights
LCD Display Backlights
Automotive Lighting Applications
with High-Voltage Boost and SEPIC Controller
IN
_______________________________________________________________ Maxim Integrated Products 1
to V
CC
General Description
. The wide input range allows
Applications
S Integrated, 2-Channel, 20mA to 150mA Linear LED
S Boost or SEPIC Power Topologies for Maximum
S Adaptive Voltage Optimization to Minimize Power
S 4.75V to 40V or 5V ±10% Input Operating Voltage
S 5000:1 PWM Dimming at 200Hz
S Open-Drain Fault Indicator Output
S LED Open/Short Detection and Protection
S Output Overvoltage and Overtemperature
S Programmable LED Current Foldback at Lower
S 200kHz to 2MHz Resistor Programmable
S Current-Mode Control Switching Stage with
S Enable Input
S Thermally Enhanced, 20-Pin TQFN (4mm x 4mm)
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
/V denotes an automotive qualified part.
MAX16838ATP+
MAX16838ATP/V+
MAX16838AUP+
MAX16838AUP/V+
Current Sinks
Flexibility
Dissipation in Linear Current Sinks
Range
Protection
Input Voltages
Switching Frequency with External
Synchronization
Internal Slope Compensation
and 20-Pin TSSOP Packages
C
COMP
PART
R
COMP
C
4.75V TO 40V
IN
EN
CFB
V
DRV
DIM
COMP
CC
IN
SGND
MAX16838
L
-40NC to +125NC
-40NC to +125NC
-40NC to +125NC
-40NC to +125NC
PGND
TEMP RANGE
Ordering Information
Simplified Schematic
DRAIN
LEDGND
NDRV
GATE
OUT1
OUT2
ISET
D
OV
FLT
CS
RT
R
ISET
R
RT
R2
R1
OV
OV
R
CS
PIN-PACKAGE
20 TQFN-EP*
20 TQFN-EP*
20 TSSOP-EP*
20 TSSOP-EP*
C
Features
OUT
LED
STRINGS

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MAX16838ATP/V+ Summary of contents

Page 1

... Internal Slope Compensation S Enable Input S Thermally Enhanced, 20-Pin TQFN (4mm x 4mm) and 20-Pin TSSOP Packages Ordering Information PART TEMP RANGE MAX16838ATP+ -40NC to +125NC MAX16838ATP/V+ -40NC to +125NC MAX16838AUP+ -40NC to +125NC MAX16838AUP/V+ -40NC to +125NC +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. /V denotes an automotive qualified part. ...

Page 2

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller ABSOLUTE MAXIMUM RATINGS IN, OUT_, DRAIN to SGND ...................................-0.3V to +45V EN to SGND ...............................................-0. PGND to SGND ....................................................-0.3V to +0.3V LEDGND to SGND ...............................................-0.3V to +0.3V ...

Page 3

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller ELECTRICAL CHARACTERISTICS (continued 12V 12.2kI ISET = LEDGND DIM ...

Page 4

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller ELECTRICAL CHARACTERISTICS (continued 12V 12.2kI ISET = LEDGND DIM ...

Page 5

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller ELECTRICAL CHARACTERISTICS (continued 12V 12.2kI ISET = LEDGND DIM ...

Page 6

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller ( 12V 12.2kI ISET LEDGND DIM PGND I vs. ...

Page 7

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller ( 12V 12.2kI ISET LEDGND DIM PGND DRV LINE ...

Page 8

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller ( 12V 12.2kI ISET LEDGND DIM PGND COMP LEAKAGE ...

Page 9

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller PIN NAME TQFN TSSOP 1 4 NDRV 2 5 DRV SGND 7 10 CFB ...

Page 10

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller PIN NAME TQFN TSSOP 16 19 DIM DRAIN 19 2 GATE 20 3 PGND — — _____________________________________________________________________________________ FUNCTION Digital PWM Dimming Input ...

Page 11

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller DRAIN POK SHDN DRV PWM CS DRIVER LOGIC GATE NDRV PGND COMP RT RT OSCILLATOR 120mV SLOPE COMPENSATION CS CS BLANKING IN UVLO DRV 5V LDO BANDGAP V CC ...

Page 12

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller Detailed Description The MAX16838 high-efficiency, HB LED driver inte- grates all the necessary features to implement a high- performance backlight driver to power LEDs in small-to- medium-sized displays for ...

Page 13

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller The voltage at each of the current-sink outputs (OUT_) is the difference between the DC-DC regulator output voltage (V ) and the total forward voltage of the LED LED ...

Page 14

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller Connect a 4.7I resistor from V CC rest of the chip from the V pin with the 5V internal CC regulator. Bypass DRV to PGND with a minimum of ...

Page 15

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller logic input that completely shuts down the device when connected to logic-low, reducing the current consumption of the device to less than 15FA (typ). The logic ...

Page 16

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller Output Capacitor Selection in Boost Configuration For the boost converter, the output capacitor supplies the load current when the main switch is on. The required output capacitance is high, ...

Page 17

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller VCC C C COMP Figure 4. SEPIC Configuration Figure 4 shows a SEPIC application circuit using the MAX16838. The SEPIC topology is necessary to ...

Page 18

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller 3) There are two loops in the power circuit that carry high-frequency switching currents. One loop is when the MOSFET is on—from the input filter capacitor positive terminal, through ...

Page 19

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller TOP VIEW NDRV 1 DRV *EXPOSED PAD VCC R C DRV R ...

Page 20

Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller Chip Information PROCESS: BiCMOS DMOS 20 _____________________________________________________________________________________ Package Information For the latest package outline information and land pat- terns (footprints www.maxim-ic.com/packages. Note that a “+”, “#”, or ...

Page 21

... 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 2011 Maxim Integrated Products © ...

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