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MAX16802BEUA+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
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.
General Description
The MAX16801A/B/MAX16802A/B high-brightness (HB)
LED driver-control ICs contain all the circuitry required
for the design of wide-input-voltage-range LED drivers
for general lighting and display applications. The
MAX16801 is well suited for universal input (rectified
85VAC to 265VAC) LED drivers, while the MAX16802 is
intended for low-input-voltage (10.8VDC to 24VDC) LED
drivers.
When the LED current needs to be tightly regulated, an
additional on-board error amplifier with 1% accurate ref-
erence can be utilized. A wide dimming range can be
implemented by using low-frequency PWM dimming.
The MAX16801/MAX16802 feature an input undervoltage
lockout (UVLO) for programming the input-supply start
voltage, and to ensure proper operation during brownout
conditions. The MAX16801 has an internal-bootstrap
undervoltage lockout circuit with a large hysteresis that
simplifies offline LED driver designs. The MAX16802 does
not have this internal bootstrap circuit and can be biased
directly from a +12V rail.
The 262kHz fixed switching frequency is internally
trimmed, allowing for optimization of the magnetic and fil-
ter components, resulting in a compact, cost-effective
LED driver. The MAX16801A/MAX16802A are offered with
50% maximum duty cycle. The MAX16801B/MAX16802B
are offered with 75% maximum duty cycle. These devices
are available in an 8-pin µMAX
®
package and operate
over the -40°C to +85°C temperature range.
Applications
Features
♦ Suitable for Buck, Boost, Flyback, SEPIC, and
Other Topologies
♦ Up to 50W or Higher Output Power
♦ Universal Offline Input Voltage Range: Rectified
85VAC to 265VAC (MAX16801)
♦ IN Pin Directly Driven From 10.8VDC to 24VDC
Input (MAX16802)
♦ Internal Error Amplifier with 1% Accurate
Reference for Precise LED Current Regulation
♦ PWM or Linear Dimming
♦ Fixed Switching Frequency of 262kHz ±12%
♦ Thermal Shutdown
♦ Digital Soft-Start
♦ Programmable Input Startup Voltage
♦ Internal Bootstrap UVLO with Large Hysteresis
(MAX16801)
♦ 45µA (typ) Startup Supply Current, 1.4mA (typ)
Operating Supply Current
♦ 50% (MAX16801A/MAX16802A) or 75%
(MAX16801B/MAX16802B) Maximum Duty Cycle
♦ Available in a Tiny 8-Pin µMAX Package
MAX16801A/B/MAX16802A/B
Offline and DC-DC PWM Controllers for
High-Brightness LED Drivers
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3880; Rev 2; 1/10
PART
TEMP
RANGE
PIN-
PACKAGE
MAX16801AEUA+ -40°C to +85°C 8 µMAX
MAX16801BEUA+ -40°C to +85°C 8 µMAX
MAX16802AEUA+ -40°C to +85°C 8 µMAX
MAX16802BEUA+ -40°C to +85°C 8 µMAX
+Denotes lead-free package.
Offline and DC-DC LED
Drivers
RGB Back Light for LCD
TVs and Monitors
Commercial and
Industrial Lighting
Decorative and
Architectural Lighting
EVALUATION KIT
AVAILABLE
Q1
MAX16802B
10.8VDC TO 24VDC
PWM
GND
C1 R1
L1
D1
C2
C3
LEDs
CS
COMP
DIM/FB
UVLO/EN IN
V
CC
NDRV
GND
ENABLE
Typical Operating Circuit
Warning: The MAX16801/MAX16802 are designed to work with high voltages. Exercise caution.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX16801A/B/MAX16802A/B
Offline and DC-DC PWM Controllers for
High-Brightness LED Drivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= +12V (MAX16801: V
IN
must first be brought up to +23.6V for startup), 10nF bypass capacitors at IN and V
CC
, C
NDRV
= 0µF,
V
UVLO
= +1.4V, V
DIM/FB
= +1.0V, COMP = unconnected, V
CS
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are
at T
A
= +25°C.) (Note 1)
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.
IN to GND
..........................................................................
-0.3V to +30V
V
CC
to GND
......................................................................
-0.3V to +13V
DIM/FB, COMP, UVLO, CS to GND..........................-0.3V to +6V
NDRV to GND.............................................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C) ..............362mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range ............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
UNDERVOLTAGE LOCKOUT/STARTUP
Bootstrap UVLO Wake-Up Level
V
SUVR
V
IN
rising (MAX16801 only)
19.68 21.6 23.60
V
Bootstrap UVLO Shutdown Level
V
SUVF
V
IN
falling (MAX16801 only)
9.05 9.74 10.43
V
UVLO/EN Wake-Up Threshold V
ULR2
UVLO/EN rising
1.188 1.28 1.371
V
UVLO/EN Shutdown Threshold V
ULF2
UVLO/EN falling
1.168 1.23 1.291
V
UVLO/EN Input Current I
UVLO
T
J
= +125°C 25 nA
UVLO/EN Hysteresis 50 mV
IN Supply Current In
Undervoltage Lockout
I
START
V
IN
= +19V, for MAX16801 only when in
bootstrap UVLO
45 90 µA
IN Voltage Range V
IN
10.8
24 V
t
EXTR
UVLO/EN steps up from +1.1V to +1.4V 12
UVLO/EN Propagation Delay
t
EXTF
UVLO/EN steps down from +1.4V to +1.1V 1.8
µs
t
BUVR
V
IN
steps up from +9V to +24V 5
Bootstrap UVLO Propagation
Delay
t
BUVF
V
IN
steps down from +24V to +9V 1
µs
INTERNAL SUPPLY
V
CC
Regulator Set Point V
CCSP
V
IN
= +10.8V to +24V, sinking 1µA to 20mA
from V
CC
7
10.5
V
IN Supply Current After Startup I
IN
V
IN
= +24V 1.4 2.5 mA
Shutdown Supply Current UVLO/EN = low 90 µA
GATE DRIVER
R
ON
(
LOW
)
Measured at NDRV sinking, 100mA 2 4
Driver Output Impedance
R
ON
(
HIGH
)
Measured at NDRV sourcing, 20mA 4 12
Ω
Driver Peak Sink Current 1A
Driver Peak Source Current
0.65
A
PWM COMPARATOR
Comparator Offset Voltage
VO
PWM
V
COMP
- V
CS
1.15 1.38 1.70
V
CS Input Bias Current I
CS
V
CS
= 0V -2 +2 µA
Comparator Propagation Delay t
PWM
V
CS
= +0.1V 60 ns
Minimum On-Time
t
ON
(
MIN
)
150
ns
MAX16801A/B/MAX16802A/B
Offline and DC-DC PWM Controllers for
High-Brightness LED Drivers
_______________________________________________________________________________________ 3
Note 1: All devices are 100% tested at T
A
= +85°C. All limits over temperature are guaranteed by characterization.
Note 2: V
REF
is measured with DIM/FB connected to the COMP pin (see the Functional Diagram).
Note 3: The MAX16801 is intended for use in universal input offline drivers. The internal clamp circuit is used to prevent the boot-
strap capacitor (C1 in Figure 5) from charging to a voltage beyond the absolute maximum rating of the device when
EN/UVLO is low. The maximum current to IN (hence to clamp) when UVLO is low (device in shutdown), must be externally
limited to 2mA (max). Clamp currents higher than 2mA may result in clamp voltage higher than +30V, thus exceeding the
absolute maximum rating for IN. For the MAX16802, do not exceed the +24V maximum operating voltage of the device.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +12V (MAX16801: V
IN
must first be brought up to +23.6V for startup), 10nF bypass capacitors at IN and V
CC
, C
NDRV
= 0µF,
V
UVLO
= +1.4V, V
DIM/FB
= +1.0V, COMP = unconnected, V
CS
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are
at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
CURRENT-SENSE COMPARATOR
Current-Sense Trip Threshold V
CS
262 291
320 mV
CS Input Bias Current I
CS
V
CS
= 0V -2 +2 µA
Propagation Delay From
Comparator Input to NDRV
t
PWM
50mV overdrive 60 ns
Switching Frequency f
SW
230 262
290 kHz
MAX1680_A 50
50.5
Maximum Duty Cycle D
MAX
MAX1680_B 75 76
%
IN CLAMP VOLTAGE
IN Clamp Voltage V
INC
2mA sink current, MAX16801 only (Note 3)
24.1 26.1 29.0
V
ERROR AMPLIFIER
Voltage Gain R
LOAD
= 100kΩ 80 dB
Unity-Gain Bandwidth R
LOAD
= 100kΩ, C
LOAD
= 200pF 2
MHz
Phase Margin R
LOAD
= 100kΩ, C
LOAD
= 200pF 65
D eg r ees
DIM/FB Input Offset Voltage 3mV
High 2.2 3.5
COMP Clamp Voltage
Low 0.4 1.1
V
Source Current 0.5 mA
Sink Current 0.5 mA
Reference Voltage V
REF
(Note 2)
1.218 1.230 1.242
V
Input Bias Current 50 nA
COMP Short-Circuit Current 8mA
THERMAL SHUTDOWN
Thermal-Shutdown Temperature
130
°C
Thermal Hysteresis 25 °C
DIGITAL SOFT-START
Soft-Start Duration
15,872
Clock
cycles
Reference Voltage Steps During
Soft-Start
31
Steps
Reference Voltage Step 40 mV
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX16802BEUA+

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Buy MAX16802BEUA+
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers Offline & DC/DC PWM for HB LED Driver
Lifecycle:
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