SKY81290 Datasheet PDF - Skyworks Solutions
| Part Number | SKY81290 | |
| Description | 1.2 A Single Flash LED Driver | |
| Manufacturers | Skyworks Solutions | |
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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 • [email protected] • www.skyworksinc.com
202388E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 17, 2013
1
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DATA SHEET • SKY81290 1.2 A SINGLE FLASH LED DRIVER WITH AS2C INTERFACE
Table 4. SKY81290 Electrical Specifications (Note 1)
(VIN = 3.6 V, CIN = COUT = 2.2 μF, RSET = 162 kΩ, L = 1 μH, TA = –40 °C to +85 °C [Typical Values are TA = +25 °C],
Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min Typical Max
Power Supply, Current Sinks
Input voltage range (Note 2)
Supply current
VIN 2.7 5.5
IIN(Q) EN/SET = FLEN = IN,
FL load = 1 A
1.40
EN/SET = IN,
FLEN = AGND
0.23
Input shutdown current
ISHDN EN/SET and FLEN = AGND
1
Maximum flash current
IFL(MAX)
RSET = 135 kΩ,
VF = 3.3 V, VIN = 4.2 V
1.2
Boost switch current limit
ILIMIT
1.8 2.8
Flash current accuracy
IFL(ACC)
IFL = 1 A
–8
+8
Total output current, Movie Mode
IMM(LOAD)
Move Mode current set to
100%, IFL = 1 A
143
Movie Mode current accuracy
IMM(ACC)
–8 +8
Flash to Movie Mode ratio
IFL/IMM
7
Switching frequency
fOSC TA = 25 °C
1.5 2.0 2.5
Over-temperature shutdown threshold
TSD
140
Output over-voltage limitation
VOVP
5.3
Open LED, short circuit protection threshold VFL_FLT
150
Protection delay time
tFLT_DEL
1.4
EN/SET, FLEN, FLINH
http://www.DataSheet4U.net/
Logic threshold:
Low
High
Internal pull-down resistance (EN/SET)
Internal pull-down resistance (FLEN, FLINH)
Serial interface low time (EN/SET)
Minimum EN/SET high time
Maximum EN/SET high time
EN/SET off timeout time
EN/SET latch timeout time
FLEN delay time:
On
Off
FLINH on delay time
VIL
VIH
REN/SET_PUDN
RPUDN
tEN/SET(LO)
tEN/SET(HI-MIN)
tEN/SET(HI-MAX)
tEN/SET(OFF)
tEN/SET(LAT)
tFLEN(ON)
tFLEN(OFF)
tFLENH(ON)
EN/SET = AGND
0.4
1.4
675
225
0.3 75
50
75
500
500
40
10
93
Auto Disable Function
Shorted LED detection voltage
VLED(DETECT)
VIN = 3.6 V, ILED = 2.4 mA
Note 1: Performance is guaranteed only under the conditions listed in this Table.
Note 2: Flash mode operation may be limited by the boost switch current limit.
1.7
Units
V
mA
mA
μA
A
A
%
mA
%
–
MHz
°C
V
mV
ms
V
V
kΩ
kΩ
μs
ns
μs
μs
μs
μs
μs
μs
V
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202388E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 17, 2013
5
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| Information | Total 19 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ SKY81290.PDF Datasheet ] | |
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