SKY81290 Datasheet PDF - Skyworks Solutions


www.Datasheet-PDF.com

SKY81290
Skyworks Solutions

Part Number SKY81290
Description 1.2 A Single Flash LED Driver
Page 19 Pages

SKY81290 datasheet pdf
View PDF for PC
SKY81290 pdf
View PDF for Mobile


No Preview Available !

DATA SHEET
SKY81290: 1.2 A Single Flash LED Driver With AS2C Interface
Applications
LED photo flash/torch devices
Camera-enabled mobile devices
Cellphones/smartphones
Multimedia mobile phones
Features
Input voltage range: 2.7 V to 5.5 V
Single channel flash output
Up to 1.2 A regulated output current
Up to 88% efficiency
Switching frequency: 2.0 MHz
Separate flash enable
Single resistor sets Flash and Movie Mode current
Flash safety timer
AS2Cwire single wire programming:
Movie Mode current
Flash/Movie Mode current ratio
Maximum flash current ratio
True Load Disconnect
Soft start and input current limit
Over voltage (open LED, open circuit), short circuit, and
over-temperature protection
TDFN (14-pin, 3 x 3 mm and 3 x 2 mm) packages (MSL1,
260 °C per JEDEC J-STD-020)
Description
The SKY81290 is a high efficiency, 1.2 A high current boost
converter with a programmable constant current sink. It is an
ideal power solution for LED photo flash applications in all single
cell, Li-ion powered products.
The SKY81290 maintains output current regulation by switching
the internal high-side and low-side switch transistors. The
transistor switches are pulse-width modulated at a fixed
frequency of 2.0 MHz. The high switching frequency allows the
use of a small external inductor and output capacitor, which
makes the SKY81290 ideally suited for small battery-powered
applications.
Skyworks proprietary Advanced Simple Serial Control
(AS2Cwire™) digital interface is used to enable, disable,
configure, and program the operation of the SKY81290. Using the
AS2Cwire interface, the Movie Mode current level for each LED,
flash safety timer, and the flash-to-Movie-Mode current ratio can
be programmed to one of 16 levels.
The SKY81290 includes a separate flash enable input (FLEN) to
initiate the flash operation. Also included is a flash inhibit pin
(FLINH) that reduces the flash current to Movie Mode levels during
high battery demand. The maximum Flash and Movie Modehttp://www.DataSheet4U.net/
current is set by one external resistor where the ratio of Flash to
Movie Mode current is set at approximately 7:1.
The SKY81290 contains a thermal management system to protect
the device in the event of an output short-circuit condition. Built-in
circuitry prevents excessive inrush current during start-up. The
shutdown feature reduces quiescent current to less than 1.0 μA.
The SKY81290 is available in a 14-pin, 3 x 3 mm TDFN package
and a 14-pin, 3 x 2 mm TDFN package. A typical application
circuit is shown in Figure 1. The pin configuration and packages
are shown in Figure 2. Signal pin assignments and functional pin
descriptions are provided in Table 1.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202388E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 17, 2013
1



No Preview Available !

DATA SHEET • SKY81290 1.2 A SINGLE FLASH LED DRIVER WITH AS2C INTERFACE
Figure 1. Typical Application Circuit
http://www.DataSheet4U.net/
Figure 2. SKY81290 Pinout – 14-Pin TDFN Packages
(Top View)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 April 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202388E



No Preview Available !

DATA SHEET • SKY81290 1.2 A SINGLE FLASH LED DRIVER WITH AS2C INTERFACE
Table 1. SKY81290 Signal Descriptions
Pin # Name
Description
1 N/C
No connect.
2 EN/SET Enable and serial control input. This pin is the AS2Cwire
addressing and programming input to adjust the Movie
Mode current level, select the Flash-to-Movie-Mode
ratio, and set the flash safety timer. This pin has an
internal 675 kΩ pull-down resistor.
3 FLEN Flash enable pin. A low-to-high transition on this pin
initiates a flash pulse and a high-to-low transition
terminates a flash pulse. This pin has an internal
225 kΩ pull-down resistor.
4 AGND Analog ground pin. Connect AGND to PGND and FLGND
at a single point as close to the device as possible.
5 IN
Flash output boost converter power input. Connect IN to
the input power source. Connect a 10 V, X7R 2.2 μF or
larger ceramic capacitor from IN to PGND, and locate as
close to the device as possible for optimum
performance.
6 SW
Boost converter switching node. Connect a 1 μH
inductor between the SW and IN pins.
7
PGND
Power ground. Connect PGND to the same single point
as AGND and located as close to the device as possible.
Pin #
8
9
Name
OUT
AGND
Description
Power output of the boost converter. Connect a 10 V,
X7R 2.2 μF or larger ceramic capacitor from OUT to
PGND, and locate as close to the device as possible.
Connect OUT to the anode of the flash LED.
Analog ground pin. Connect AGND to PGND and FLGND
at a single point as close to the device as possible.
10 FLINH Flash inhibit pin. FLINH is an active high control input
with an internal 225 kΩ resistor to AGND. A low-to-high
transition on the FLINH pin reduces FL pin sink current
to the maximum (default) Movie Mode current level.
11 N/C
No connect.
12 FLGND Flash ground pin. Connect FLGND to PGND and AGND at
a single point as close to the device as possible.
13 FL
LED flash current sink pin. Connect the cathode of the
flash LED to this pin.
14 RSET Flash current set pin. Connect a resistor from RSET to
AGND to program the desired flash current for the
current sink pin (FL).
http://www.DataSheet4U.net/
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202388E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 17, 2013
3



No Preview Available !

DATA SHEET • SKY81290 1.2 A SINGLE FLASH LED DRIVER WITH AS2C INTERFACE
Table 2. SKY81290 Absolute Maximum Ratings
Parameter
Symbol
Minimum
Maximum
Units
Maximum voltage rating
IN, OUT, SW
0.3 +6.0
V
EN/SET, FLEN,
FLINH, RSET, FL
0.3
VIN + 0.3
V
Storage temperature
TS
65 +150
°C
Junction operating temperature
TJ
20 +150
°C
Soldering temperature (at leads, 10 sec)
TLEAD
+300
°C
Thermal resistance (as mounted on an FR4 board, measured
according to EIA/JESD 51 series):
3 x 3 TDFN
3 x 2 TDFN
ΘJA
35
41
°C/W
°C/W
Maximum power dissipation @ 25 °C:
3 x 3 TDFN
3 x 2 TDFN
PD
3.29
2.80
W
W
Note: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device.
CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.
Table 3. SKY81290 Recommended Operating Conditions
Parameter
Symbol
Input voltage
VIN
Operating temperature
TOP
Minimum
2.7
http://www.DataSheet4U.net/
40
Typical
Maximum
5.5
+85
Units
V
°C
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY81290 are provided in
Table 2. Recommended operating conditions are specified in
Table 3. Electrical specifications are provided in Table 4.
Typical performance characteristics of the SKY81290 are
illustrated in Figures 3 to 19.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
4 April 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202388E




SKY81290 datasheet pdf
Download PDF
SKY81290 pdf
View PDF for Mobile


Similiar Datasheets : SKY81290

Index :   0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z   

This is a individually operated, non profit site. If this site is good enough to show, please introduce this site to others.
Since 2010   ::   HOME   ::   Privacy Policy + Contact