|
|
PDF AAT3169 Data sheet ( Hoja de datos )
| Número de pieza | AAT3169 | |
| Descripción | High Efficiency 1X/1.5X/2X Charge Pump | |
| Fabricantes | AAT | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AAT3169 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
AAT3169
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
General Description
Features
ChargePump™
The AAT3169 is a low noise, constant frequency
charge pump DC/DC converter that uses a tri-mode
• VIN Range: 2.7V to 5.5V
• Fully Programmable Current with Single Wire
load switch (1X), fractional (1.5X), and doubling
— 16-Step Logarithmic Scale
(2X) conversion to maximize efficiency for white
— 15/20/30mA Max Current
LED applications. The AAT3169 is capable of driv-
— Four Low-Current Settings Down to 115µA
ing six LEDs for a total of 180mA from a 2.7V to
5.5V input. The current sinks may be operated indi-
— Low IQ (65µA) for Single-Channel, Low-
Current Mode
vidually or in parallel for driving higher current LEDs.
• Tri-Mode 1X, 1.5X, and 2X Charge Pump for
A low external parts count (two 1µF flying capacitors
and two small 1µF capacitors at IN and OUTCP)
Maximum Efficiency and VF Coverage
• Drives Up to Six LEDs
make this part ideally suited for small, battery-pow-
• Individual Main-Sub (5-1) Group Control
ered applications.
• No Inductors, Low Noise Operation
AnalogicTech's AS2Cwire™ (Advanced Simple Serial
Control™) serial digital input is used to enable, dis-
able, and set current for each LED with a 16-level
logarithmic scale plus four low-current settings down
to 115µA. For optimized efficiency, low-current set-
tings require only 65µA of housekeeping current.
• 1MHz Constant Switching Frequency
• Small Application Circuit
• Built-In Thermal Protection
• Built-In Auto-Disable for Open Circuit
• Automatic Soft Start
• IQ <1µA in Shutdown
• Thermally-Enhanced STDFN33-14 or
Each output of the AAT3169 is equipped with built-
QFN44-16 Package
in protection for output short-circuit and auto-dis-
able for load short-circuit conditions. Built-in soft-
www.DataSheet4U.com
start circuitry prevents excessive inrush current
during start-up. A low-current shutdown feature dis-
Applications
connects the load from the input and reduces qui-
escent current to less than 1µA.
• Color (RGB) Lighting
The AAT3169 is available in a Pb-free, space-sav-
ing, thermally-enhanced 16-pin 4x4mm QFN pack-
age or a low-profile 14-pin 3x3mm STDFN pack-
age and is rated over the -40°C to +85°C tempera-
• Programmable Current Sink
• Transmissive Displays
• White LED Backlighting
• White Photo Flash for Digital Still Cameras
ture range.
Typical Application
C1
1µF
2.7V to 5.5V
CIN
1µF
EN/SET
C1+ C2+
C1- C2-
OUTCP
IN
AAT3169
EN/SET
D1
D2
D3
D4
D5
D6
C2
1µF Main
Sub
COUT
1µF
D1 D2 D3 D4 D5 D6
3169.2006.08.1.2
1
1 page  
AAT3169
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
Typical Characteristics
CIN = COUT = C1 = C2 = 1.0µF, VIN = 3.6V, TA = 25°C, unless otherwise noted.
Efficiency vs. Supply Voltage
100
90
80
70
60
50
2.8
4.9mA/ch
VF = 2.9V
10.9mA/ch
VF = 3.1V
20mA/ch
VF = 3.4V
3.0 3.2 3.4 3.6 3.8 4.0 4.2
Supply Voltage (V)
EN
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
Turn-On to 1X Mode
(VIN = 4.2V; 20mA/Channel)
Time (100µs/div)
EN
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
Turn-On to 1.5X Mode
(VIN = 3.8V; 20mA/Channel)
Time (100µs/div)
EN
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
Turn-On to 2X Mode
(VIN = 2.8V; 20mA/Channel)
Time (100µs/div)
EN
(2V/div)
VF
(1V/div)
IIN
(100mA/div)
Turn-Off from 1.5X Mode
(VIN = 3.5V; 20mA/Channel)
Time (100µs/div)
Current Matching vs. Temperature
20.2
20.0
19.8
19.6
19.4
19.2
-40
Channel 2
Channel 1
Channel 5
Channel 3
Channel 4
Channel 6
-20 0 20 40 60 80
Temperature (°C)
3169.2006.08.1.2
5
5 Page 
AAT3169
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
AS2Cwire Serial Interface Timing
EN/SET
Address
Address
THI
TLO
TLAT
12
17 18
0
Data
TLAT
1 2 . . . n <= 16
1
Data Reg 1
Data Reg 2
0n
0
Applications Information
LED Selection
Although the AAT3169 is designed for driving white
LEDs, the device also can be used to drive most
types of LEDs with forward voltages from 2.0V to
4.7V. LED applications may include main and sub-
LCD display backlighting, camera photo-flash
applications, color (RGB) LEDs, infrared (IR)
diodes for remotes, and other loads benefiting from
a controlled output current generated from a vary-
ing input voltage. Since the D1 to D6 input current
sinks are matched with negligible voltage depend-
ence, the LED brightness will be matched regard-
less of the specific LED forward voltage (VF) levels.
In some instances (e.g., in high luminous output
applications such as photo flash), it may be neces-
sary to drive high-VF type LEDs. The low dropout
current sinks in the AAT3169 make it capable of
driving LEDs with forward voltages as high as 4.7V
at full current from an input supply as low as 3.0V.
Outputs can be paralleled to drive high-current
LEDs without complication.
Device Switching Noise Performance
The AAT3169 operates at a fixed frequency of
approximately 1MHz to control noise and limit har-
monics that can interfere with the RF operation of
cellular telephone handsets or other communica-
tion devices. Back-injected noise appearing on the
input pin of the charge pump is 20mV peak-to-
peak, typically ten times less than inductor-based
DC/DC boost converter white LED backlight solu-
tions. The AAT3169 soft-start feature prevents
noise transient effects associated with inrush cur-
rents during start-up of the charge pump circuit.
Capacitor Selection
Careful selection of the four external capacitors
(CIN, C1, C2, and COUT) is important because they
will affect turn-on time, output ripple, and transient
performance. Optimum performance will be
obtained when low ESR ceramic capacitors are
used; in general, low ESR may be defined as less
than 100mΩ. A value of 1µF for all four capacitors
is a good starting point when choosing capacitors.
If the LED current sources are programmed only
for light current levels, then the capacitor size may
be decreased.
3169.2006.08.1.2
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AAT3169.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AAT3164 | High Efficiency 1X/1.5X/2X Charge Pump |  Advanced Analogic Technologies |
| AAT3166 | High Efficiency 1X/1.5X/2X Charge Pump | AAT |
| AAT3167 | High Efficiency 1X/1.5X/2X Charge Pump | AAT |
| AAT3169 | High Efficiency 1X/1.5X/2X Charge Pump | AAT |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |