MIC2870 Datasheet, PDF (2/25 Pages) Micrel Semiconductor – 1.5A Synchronous Boost Flash LED Driver with I2C Interface

Micrel, Inc.
Ordering Information
Part Number
Marking
Temperature Range
Package⁽¹⁾
MIC2870YFT
70H
–40°C to +125°C
16-Pin 2mm × 2mm TQFN
Note:
1. Package is a GREEN, RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
2. Thin QFN pin 1 identifier = “▲”.
Pin Configuration
MIC2870
Lead Finish
NiPdAu
16-Pin 2mm × 2mm TQFN
(Top View)
Pin Description
Pin Number
1
Pin Name
SCL
2
VIN
3
FEN
4
FI
5
FRSET
6
AGND
Pin Function
High-Speed Mode (3.4MHz) I²C Clock Input.
Supply Input. Connect a low-ESR ceramic capacitor of at least 4.7µF to PGND. A small capacitor
of 100nF between VIN and AGND is highly recommended.
Flash-Mode Enable Pin. A LOW-to-HIGH transition initiates the flash mode and flash-mode timer.
If FEN is left floating, it is pulled-down internally by a built-in 1µA current source when the device
is enabled.
Flash Inhibit. When FI is pulled HIGH, both LED currents are changed from the flash-mode
current level to the torch-mode current level. If FI is left floating, it is pulled-down internally by a
built-in 1µA current source when the device is enabled. This function is generally used to reduce
instantaneous battery load current by synchronizing with the handset’s GSM pulse off time.
Flash-Mode Current Level Programming. Connect a resistor from FRSET to AGND to set the
maximum current in the flash mode. For example, a 10kΩ resistor sets the LED sink current to its
maximum value of 750mA per channel. FRSET can be grounded if the default maximum flash-
mode current (750mA) is desired. FRSET, however, cannot be left floating and the maximum
resistance is limited to 80kΩ
Analog Ground. Reference ground for FRSET and TRSET pins.
September 5, 2013
2
Revision 1.0