Features: • VIN Range: 2.7V to 5.5V
• Dual Channel Output
• Up to 1.5A Regulated Output Current (750mA per channel)
• Up to 85% Efficiency with Small Inductor (1H)
• 2 MHz Switching Frequency
• Separate Flash Enable
• Separate Flash Inhibit
• User-Programmable Safety Timer
• Single Resistor Sets Flash and Movie Mode Current
• AS2Cwire Single Wire Programming:
▪ Movie Mode Current
▪ Flash/Movie Mode Current Ratio
▪ Movie Mode Output Configuration
▪ Flash Safety Timer
• True Load Disconnect
• Input Current Limit
• Over-Voltage (Open LED, Open Circuit), Short Circuit, and Over-Temperature Protection
• Shutdown Current < 1.0A
• 14-pin TDFN 3x3 mm Package
• -40 to +85 Temperature RangeApplication• Camcorder Video Light (Torch Light)
• Cellphones/Smartphones
• Digital Still Cameras (DSCs)
• LED Photo Flash/Torch
• Mobile HandsetsPinout
Specifications
- VIN Range: 2.7V to 5.5V
- Dual Channel Output
- Up to 1.5A Regulated Output Current (750mA per channel)
- Up to 85% Efficiency with Small Inductor (1H)
- 2 MHz Switching Frequency
- Separate Flash Enable
- Separate Flash Inhibit
- User-Programmable Safety Timer
- Single Resistor Sets Flash and Movie Mode Current
- AS2Cwire Single Wire Programming:
- Movie Mode Current
- Flash/Movie Mode Current Ratio
- Movie Mode Output Configuration
- Flash Safety Timer
- True Load Disconnect
- Input Current Limit
- Over-Voltage (Open LED, Open Circuit), Short Circuit, and Over-Temperature Protection
- Shutdown Current < 1.0A
- 14-pin TDFN 3x3 mm Package
- -40C to +85C Temperature Range
| Symbol |
Description |
Value |
Units |
| IN, SW, OUT |
Maximum Rating |
-0.3 to 6.0 |
V |
RSET, EN/SET, FLEN, FLINH, CT,
FLOUTA, FLOUTB |
Maximum Rating |
VIN + 0.3 |
V |
| TJ |
Operating Temperature Range |
-40 to 150 |
|
| Ts |
Storage Temperature Range |
-65 to 150 |
|
| TLEAD |
Maximum Soldering Temperature (at leads, 10 sec) |
300 |
|
Descriptionspan id="lblDescription">
The AAT1271 is a high-efficiency, high-current boost converter capable of 1.5A typical output current. It is an ideal power solution for LED photo flash applications in all single cell Li-ion powered products.
The AAT1271 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 2MHz. The high switching frequency allows the use of a small inductor and output capacitor, making the AAT1271 ideally suited for small battery-powered applications.
AnalogicTech proprietary AS2Cwire™ (Advanced Simple Serial Control™) serial digital interface is used to enable, disable, configure, and program the operation of the AAT1271. Using the AS2Cwire interface, the movie-mode current level for each LED, the safety timer delay, and the flash-to-movie-mode current ratio can be programmed to one of 16 levels. In addition, the single-wire serial protocol sets output channel control. The AAT1271 also includes a separate Flash Enable input to initiate both the flash operation and the default timer which can be used either to terminate a flash event at the end of a user-programmed delay or as a safety feature. Also included is a Flash Inhibit pin which reduces the flash current to movie-mode levels during high battery demand.
The maximum flash and movie-mode current is set by one external resistor where the ratio of Flash to Movie-mode current is set at approximately 7.3:1. One or two LEDs can be connected to the AAT1271, where in the case of two LEDs the output current is matched between each diode.
The AAT1271 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 1.0A.
The AAT1271 is available in a Pb-free, thermally-enhanced 14-pin 3x3mm TDFN package.
The AAT1271 is a high-efficiency, high-current boost converter capable of 1.5A typical output current. It is an ideal power solution for LED photo flash applications in all single cell Li-ion powered products.
The AAT1271 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 2MHz. The high switching frequency allows the use of a small inductor and output capacitor, making the AAT1271 ideally suited for small battery-powered applications.
AnalogicTech's proprietary AS2Cwire™ (Advanced Simple Serial Control™) serial digital interface is used to enable, disable, configure, and program the operation of the AAT1271. Using the AS2Cwire interface, the movie-mode current level for each LED, the safety timer delay, and the flash-to-movie-mode current ratio can be programmed to one of 16 levels. In addition, the single-wire serial protocol sets output channel control. The AAT1271 also includes a separate Flash Enable input to initiate both the flash operation and the default timer which can be used either to terminate a flash event at the end of a userprogrammed delay or as a safety feature. Also included is a Flash Inhibit pin which reduces the flash current to movie-mode levels during high battery demand.
The maximum flash and movie-mode current is set by one external resistor where the ratio of Flash to Movie-mode current is set at approximately 7.3:1. One or two LEDs can be connected to the AAT1271, where in the case of two LEDs the output current is matched between each diode.
The AAT1271 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 1.0A.
The AAT1271 is available in a Pb-free, thermally-enhanced 14-pin 3x3mm TDFN package.
AAT1271 Data Sheet
