mic2292-34yml Micrel Semiconductor, mic2292-34yml Datasheet

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mic2292-34yml

Manufacturer Part Number
mic2292-34yml
Description
Mic2292/mic2293 High Frequency Pwm White Led Drivers With Internal Schottky Diode And Ovp
Manufacturer
Micrel Semiconductor
Datasheet

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Part Number
Manufacturer
Quantity
Price
Part Number:
MIC2292-34YML
Manufacturer:
TI
Quantity:
2 743
General Description
The MIC2292 and MIC2293 are high frequency, Pulse Width
Modulator (PWM) boost regulators optimized for constant-
current, white LED driver applications. Because of their
constant PWM switching frequencies of 1.6MHz and 2MHz,
respectively, the MIC2292/93 can use the smallest external
components, allowing designers to avoid sensitive IF bands
in their RF applications.
The products feature an internal Schottky diode and two
levels of output overvoltage protection allowing a small size
and efficient DC/DC solution that requires only four external
components.
The 2.5V to 10V input voltage range of MIC2292/3
allows direct operation from 1- and 2-cell Li Ion as well as
3- to 4-cell NiCad/NiMH/Alkaline batteries. The MIC2292/3
products are available in a small size 2mm × 2mm 8-lead
MLF™ package and have a junction temperature range of
–40°C to +125°C.
All support documentation can be found on Micrel’s web site
at www.micrel.com.
Typical Application
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
July 2005
MIC2292/93
Li Ion
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
1.6MHz PWM White LED Driver with 15V OVP
1µF
MIC2292-15BML
VIN
EN
15µH
GND
OUT
SW
FB
95mV
6.3Ω
0.22µF
16V
1
Features
• 2.5V to 10V input voltage
• Output voltage up to 34V
• Internal Schottky diode
• 1.6MHz PWM operation (MIC2292)
• 2.0MHz PWM operation (MIC2293)
• Stable with ceramic capacitors
• 15V and 34V output overvoltage protection options
• 500mA switch current rating
• 95mV feedback voltage
• <1% line and load regulation
• <1µA shutdown current
• Over-temperature protection
• UVLO
• 8-lead (2mm × 2mm) MLF™package
• –40°C to +125°C junction temperature range
Applications
• White LED driver for backlighting
• Constant current power supplies
High Frequency PWM White LED Drivers with
– Cell phones
– PDAs
– GPS systems
– Digital cameras
– MP3 players
– IP phones
Li Ion
2MHz PWM White LED Driver with 15V OVP
Internal Schottky Diode and OVP
1µF
MIC2292/93
MIC2293-15BML
VIN
EN
10µH
GND
OUT
SW
FB
95mV
6.3Ω
M9999-070105
0.22µF
16V
Micrel, Inc.

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mic2292-34yml Summary of contents

Page 1

... MIC2292/93 General Description The MIC2292 and MIC2293 are high frequency, Pulse Width Modulator (PWM) boost regulators optimized for constant- current, white LED driver applications. Because of their constant PWM switching frequencies of 1.6MHz and 2MHz, respectively, the MIC2292/93 can use the smallest external components, allowing designers to avoid sensitive IF bands in their RF applications ...

Page 2

... MIC2292/93 Ordering Information Marking Part Number Code MIC2292-15BML SWA MIC2292-15YML SWA MIC2292-34BML SWC MIC2292-34YML SWC MIC2293-15BML SZA MIC2293-15YML SZA MIC2293-34BML SZC MIC2293-34YML SZC Pin Configuration Pin Description Pin Number Pin Name 1 OUT 2 VIN 4,8 GND EP GND M9999-070105 ...

Page 3

... V = 10V EN SW TURN ON TURN OFF V = 10V EN MIC2292 MIC2293 I = 150mA 30V R MIC2292/93-15 MIC2292/93-34 Hysteresis , and the ambient temperature The maximum allowable power dissipation will result in excessive Micrel, Inc. (2) ) ..........................................2.5V to 10V IN ) ....................................... OUT IN ) ............ –40°C to +125° .............................................. 93°C/W JA ≤ ...

Page 4

... MIC2292/93 Typical Characteristics Feedback Voltage vs. Input Voltage 100 (V) IN Switch Frequency vs. Temperature 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -40 - 100 TEMPERATURE (°C) Schottky Reverse Leakage Current 2 25V 1 16V R 0 10V 100 TEMPERATURE (° ...

Page 5

... Schottky rectifier diode. The oscillator generates a 1.6MHz clock for the MIC2292 and a 2.0MHz clock for the MIC2293. The clocks' two functions are to trigger the PWM generator that turns on the output transistor and to reset the slope compensation ramp generator. The current amplifi ...

Page 6

... MIC2292/93 External Component Selection The MIC2292/93 can be used across a wide rage of applica- Series LEDs 2 22µH 15µH 10µH 6.8µH 4.7µH 3 22µH 15µH 10µH 6.8µH 4.7µH 4 22µH 15µH 10µH 6.8µH 4.7µ 22µH 15µH 10µH 6.8µH 4.7µ 22µH 15µH 10µ ...

Page 7

... If the LEDs are disconnected from the circuit case an LED fails open, the sense resistor will pull the FB pin to ground. This will cause the MIC2292/93 to switch with a high duty-cycle resulting in output overvoltage. This may cause the SW pin voltage to exceed its maximum voltage rating, possibly damaging the IC and the external components ...

Page 8

... MIC2292/93 Functional Characteristics 6-Series LED Circuit with External Soft-Start TIME (100µs/ M9999-070105 6-Series LED Circuit without External Soft-Start L = 10µ 1µ 0.22µF OUT 20mA OUT 6 LEDs C = 2200pF 10kΩ 8 Micrel, Inc 10µ 1µ 0.22µF ...

Page 9

... MIC2292/93 Package Information MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. ...

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