|
|
PDF AAT3170 Data sheet ( Hoja de datos )
| Número de pieza | AAT3170 | |
| Descripción | High Current LED Flash Driver Charge Pump IC | |
| Fabricantes | ANALOGICTECH | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AAT3170 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
AAT3170
High Current LED Flash Driver Charge Pump IC
General Description
Features
ChargePump™
The AAT3170 is a high output current, high effi-
ciency, low noise, low profile charge pump DC/DC
converter, ideal for multi-function LED photo-flash
applications where solution cost, size, and efficien-
cy are critical.
The dual charge pump in the AAT3170 is capable
of delivering 600mA output current. Two current-
controlled paths are available for users of dual
flash LEDs that prefer current matching. Each LED
channel can be easily programmed in 32 steps with
a single GPIO output through the AS2Cwire™
(Advanced Simple Serial Control™) interface. This
allows smooth transitions and flexible adjustment
of brightness in flash or other lighting modes.
The tri-mode (1X/1.5X/2X) operation of the internal
charge pump offers excellent power efficiency for
both flash and movie modes. Combined with a low
external parts count (two 1µF flying capacitors and
one small bypass capacitor at VIN and OUT), the
AAT3170 is ideally suited for small, battery-powered
applications.
The AAT3170 has a thermal management system to
protect the device in the event of a short-circuit con-
dition at the output pin. Built-in soft-start circuitry
prevents excessive inrush current during start-up.
The shutdown feature disconnects the load from VIN
and reduces quiescent current to less than 1.0µA.
The AAT3170 is available in the Pb-free, thermally-
enhanced, 12-pin 3x3mm TDFN package.
• VIN Range: 2.7V to 5.5V
• 600mA Output Current
• Tri-Mode 1X/1.5X/2X in Current Mode
• Voltage Mode Operation: 1.5X, 200mA
• Dual Regulated Current Sinks
• Current Match Between Current Sinks
• 32 Current Steps Set by AS2Cwire
• 1µF Input, Output, and Flying Capacitors
• <1.0µA of Shutdown
• Small Application Circuit
• No Inductors
• Automatic Soft Start
• 12-Pin TDFN 3x3mm Package
• -40°C to +85°C Temperature Range
Applications
• Camera Phones
• Digital Still Cameras (DSCs)
• PDAs and Notebook PCs
• Smart Phones
Typical Application
C1 C2
1µF 1µF
2.7V to 5.5V
C1+
VIN
C1- C2+ C2-
VOUT
CIN
4.7µF
AAT 3170
COUT
2.2µF
Flash
LED 1
EN/SET
CT
0.1µF
EN/SET
CT
GND
F1
F2
Flash
LED 2
3170.2006.10.1.0
DataSheet4 U .com
1
1 page  
www.DataSheet4U.com
AAT3170
High Current LED Flash Driver Charge Pump IC
Typical Characteristics
VIN = 3.6V, CIN = 4.7µF, COUT = 2.2µF, C1 = C2 = 1µF, TA = 25°C, unless otherwise noted.
Efficiency vs. Supply Voltage
100
90 50mA/ch
80 VF = 2.9V
70 152mA/ch
60 VF = 3.2V
50
40 95mA/ch
VF = 3.1V
30
20
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2
Supply Voltage (V)
EN
(2V/div)
VOUT
(2V/div)
VSINK
(1V/div)
IIN
(200mA/div)
Turn-On to 1X Mode
(VIN = 4.2V; 50mA/ch Load)
Time (200µs/div)
EN
(2V/div)
VOUT
(2V/div)
VSINK
(1V/div)
IIN
(200mA/div)
Turn-On to 1.5X Mode
(VIN = 3.2V; 50mA/ch Load)
Time (200µs/div)
EN
(2V/div)
VOUT
(2V/div)
VSINK
(1V/div)
IIN
(500mA/div)
Turn-On to 1X Mode
(VIN = 4.2V; 300mA/ch Load)
Time (500µs/div)
EN
(2V/div)
VOUT
(2V/div)
VSINK
(1V/div)
IIN
(500mA/div)
Turn-On to 2X Mode
(VIN = 3.2V; 300mA/ch Load)
Time (500µs/div)
EN
(2V/div)
VF
(1V/div)
IIN
(200mA/div)
Turn-Off from 1.5X Mode
(VIN = 3.2V; 50mA/ch Load)
Time (200µs/div)
3170.2006.10.1.0
DataSheet4 U .com
5
5 Page 
www.DataSheet4U.com
AAT3170
High Current LED Flash Driver Charge Pump IC
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
0 n-1
Data Reg 2
0
Applications Information
AS2Cwire Programming
Generally, programming the AAT3170 is achieved
by submitting bursts of address and data edges to
the EN/SET pin. However, in some cases multiple
bursts of address and data are needed to enable a
particular operating mode. In other cases, only a
single burst of data edges is required.
To enable both flash channels to a current setting
on the LO scale, the user submits a single burst of
address and data edges. To enable both flash chan-
nels to a current setting on the HI scale, the user
must submit a burst of address and data edges to
program the current setting level, and then submit a
second burst of address and data edges to program
the HI/LO scale register to the HI scale.
Shortcuts can also be used. If the device is in shut-
down, both flash channels can be enabled to a set-
ting on the LO scale by just giving a single burst of
data edges. The address edges are not needed
because all registers are reset during shutdown
and address 0 is the default. Further, a single burst
of data edges can be used to change from one set-
ting to another for the last address. The address
register is not reset after each write; therefore, sub-
mitting address edges is only required when
changing the address.
Additional Applications
The constant voltage mode feature of the AAT3170
allows the user to combine the flash feature with
additional applications. Additional applications
such as auxiliary lighting and status LEDs can be
added while eliminating the need for an additional
power supply, which is normally required. Since the
constant voltage mode can supply a regulated out-
put at up to 100mA load, it is capable of driving five
LEDs at 20mA each. It is suitable for keypad light-
ing, status lighting, and other applications where a
4.5V power supply could be used.
When enabling constant voltage mode, the LED
channels F1 and F2 are automatically disabled so
current does not flow through the flash LED during
constant voltage mode. Because of this, very little
programming is required. The user just addresses
the voltage mode register and programs it to volt-
age mode.
3170.2006.10.1.0
DataSheet4 U .com
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet AAT3170.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AAT3170 | High Current LED Flash Driver Charge Pump IC | ANALOGICTECH |
| AAT3171 | High Efficiency Charge Pump |  AAT |
| AAT3172 | High Current LED Flash Driver Charge Pump IC | ANALOGICTECH |
| AAT3174 | High Current LED Flash Driver Charge Pump IC | ANALOGICTECH |
| 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 |