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MIC2845A

Description
High Efficiency 6 Channel Linear WLED Driver with DAM鈩? Ultra Fast PWM鈩?Control and Dual Low IQ LDOs
File Size1MB,19 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Download Datasheet Compare View All

MIC2845A Overview

High Efficiency 6 Channel Linear WLED Driver with DAM鈩? Ultra Fast PWM鈩?Control and Dual Low IQ LDOs

MIC2845A
High Efficiency 6 Channel Linear WLED
Driver with DAM™, Ultra Fast PWM™
Control and Dual Low I
Q
LDOs
General Description
The MIC2845A is a high efficiency White LED (WLED)
driver designed to drive up to six LEDs, greatly extending
battery life for portable display backlighting, keypad
backlighting, and camera flash in mobile devices. The
MIC2845A provides the highest possible efficiency as this
architecture has no switching losses present in traditional
charge pumps or inductive boost circuits. The MIC2845A
provides six linear drivers channels which maintain
constant current for up to six LEDs. It features a typical
dropout of 40mV at 20mA. This allows the LEDs to be
driven directly from the battery eliminating switching
noise/losses present with the use of boost circuitry.
The MIC2845A features Dynamic Average Matching™
(DAM™) which is specifically designed to provide optimum
matching across all WLEDs. The six channels are
matched better than ±1.5% typical, ensuring uniform
display illumination under all conditions. The brightness is
controlled through an Ultra Fast PWM™ Control interface
operating down to less than 1% duty cycle.
The MIC2845A also features two independently enabled
low quiescent current LDOs. Each LDO offers ±3%
accuracy from the nominal voltage over temperature, low
dropout voltage (150mV @ 150mA), and low ground
current under all load conditions (typically 35µA). Both
LDOs can be disabled to draw virtually no current.
The MIC2845A is available in the 14-pin 2.5mm x 2.5mm
Thin MLF
®
leadless package with a junction temperature
range of -40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
WLED Driver
High Efficiency (no Voltage Boost losses)
Dynamic Average Matching™ (DAM™)
Ultra Fast PWM™ control (200Hz to 500kHz)
Input voltage range: 3.0V to 5.5V
Dropout of 40mV at 20mA
Matching better than ±1.5% (typical)
Current accuracy better than ±1.5% (typical)
Maintains proper regulation regardless of how many
channels are utilized
Very low ground current – Typical 35µA
Stable with 1µF ceramic output capacitor
Dropout of 150mV at 150mA
Thermal shutdown and current limit protection
Available in a 14-pin 2.5mm x 2.5mm Thin MLF
®
package
LDOs
Applications
Mobile handsets
LCD Handset backlighting
Handset keypad backlighting
Digital cameras
Portable media/MP3 players
Portable navigation devices (GPS)
Portable applications
DAM, Dynamic Average Matching and Ultra Fast PWM are trademarks of Micrel, Inc.
MLF and
MicroLeadFrame
are registered trademark Amkor Technology Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
April 2010
M9999-041210-C

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Description High Efficiency 6 Channel Linear WLED Driver with DAM鈩? Ultra Fast PWM鈩?Control and Dual Low IQ LDOs N-channel TrenchMOS intermediate level FET High Efficiency 6 Channel Linear WLED Driver with DAM鈩? Ultra Fast PWM鈩?Control and Dual Low IQ LDOs High Efficiency 6 Channel Linear WLED Driver with DAM鈩? Ultra Fast PWM鈩?Control and Dual Low IQ LDOs High Efficiency 6 Channel Linear WLED Driver with DAM鈩? Ultra Fast PWM鈩?Control and Dual Low IQ LDOs High Efficiency 6 Channel Linear WLED Driver with DAM鈩? Ultra Fast PWM鈩?Control and Dual Low IQ LDOs
Is it Rohs certified? - - conform to conform to conform to conform to
Maker - - Microchip Microchip Microchip Microchip
package instruction - - HVQCCN, HVQCCN, HVQCCN, HVQCCN,
Reach Compliance Code - - compli compli compli compli
ECCN code - - EAR99 EAR99 EAR99 EAR99
Interface integrated circuit type - - LED DISPLAY DRIVER LED DISPLAY DRIVER LED DISPLAY DRIVER LED DISPLAY DRIVER
JESD-30 code - - S-XQCC-N14 S-XQCC-N14 S-XQCC-N14 S-XQCC-N14
JESD-609 code - - e4 e4 e4 e4
length - - 2.5 mm 2.5 mm 2.5 mm 2.5 mm
Humidity sensitivity level - - 1 1 1 1
Multiplex display function - - NO NO NO NO
Number of functions - - 1 1 1 1
Number of segments - - 6 6 6 6
Number of terminals - - 14 14 14 14
Maximum operating temperature - - 125 °C 125 °C 125 °C 125 °C
Minimum operating temperature - - -40 °C -40 °C -40 °C -40 °C
Package body material - - UNSPECIFIED UNSPECIFIED UNSPECIFIED UNSPECIFIED
encapsulated code - - HVQCCN HVQCCN HVQCCN HVQCCN
Package shape - - SQUARE SQUARE SQUARE SQUARE
Package form - - CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius) - - 260 260 260 260
Certification status - - Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height - - 0.6 mm 0.6 mm 0.6 mm 0.6 mm
Maximum supply voltage - - 5.5 V 5.5 V 5.5 V 5.5 V
Minimum supply voltage - - 3 V 3 V 3 V 3 V
Nominal supply voltage - - 3.8 V 3.8 V 3.8 V 3.8 V
surface mount - - YES YES YES YES
Temperature level - - AUTOMOTIVE AUTOMOTIVE AUTOMOTIVE AUTOMOTIVE
Terminal surface - - NICKEL PALLADIUM GOLD NICKEL PALLADIUM GOLD NICKEL PALLADIUM GOLD NICKEL PALLADIUM GOLD
Terminal form - - NO LEAD NO LEAD NO LEAD NO LEAD
Terminal pitch - - 0.5 mm 0.5 mm 0.5 mm 0.5 mm
Terminal location - - QUAD QUAD QUAD QUAD
Maximum time at peak reflow temperature - - 40 40 40 40
width - - 2.5 mm 2.5 mm 2.5 mm 2.5 mm
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