LED Drivers family teaser
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Highly efficient LED drivers provide optimal performance in general lighting applications and in LED backlighting systems for large flat display panels.
The AS1100 is a SPI interfaced, dot-matrix LED driver for a 8x8 LED matrix or 8 7-segment LEDs. It includes a 4-bit PWM for the entire matrix and an external resistor can be used for analog current adjustment up to 5mA per LED.
The AS1104 is a high efficient direct LED driver IC. It offers 4 40mA outputs which can be dimmed with an external PWM and adjusted in analog current with an resistor. It only requires 150mV headroom voltage to operate.
The AS1105 is a SPI interfaced, dot-matrix LED driver IC for a 4x8 LED matrix or 4 7-segment LEDs. It includes a 4-bit PWM for the entire matrix and an external resistor can be used for analog current adjustment up to 10mA per LED.
Lighting Management Units
Highly integrated, flexible lighting management ICs support nearly all the illumination tasks performed in mobile phones.
The AS3490 is an inductive highly efficient DC-DC boost converter. The DC-DC converter operates at a fixed frequency of 2MHz and includes soft startup to allow easy integration into noise sensitive RF systems. A predictable startup is guaranteed even with very low duty cycle PWM input signals. The output of the DC-DC converter is used for three current sources connected to up to 6 LEDs.
The AS3492 is an inductive highly efficient DC-DC boost converter. The DC-DC converter operates at a fixed frequency of 2MHz and includes soft startup to allow easy integration into noise sensitive RF systems. A predictable startup is guaranteed even with very low duty cycle PWM input signals. The output of the DC-DC converter is used for five current sources connected to up to 10 LEDs.
DC-DC Buck-Boost Converters
ams buck-boost converters offer high efficiency over a wide input-voltage range. The converters can convert voltages greater than, less than and equal to the output voltage at efficiencies of up to 90%.
The AS1331 is a synchronous buck-boost converter with 300mA output capability at 3.3V, ideal for single- and multi-cell operation. With 22µA quiescent current the device ensures over 90% efficiency. System protection includes undervoltage/power good signalling, and both current limiting and thermal shutdown.
DC-DC Charge Pumps
Charge pumps – inductorless boost converters – from ams operate at up to 90% efficiency.
The AS1302 is a 30mA inductorless boost converter with up to 90% efficiency. Designed to work off 2.9V to 5.15V input, the device generates a stable 5V rail. Integrated soft start feature limits in-rush currents.
DC-DC boost controllers from ams work closely with ams LED drivers. They minimize power loss by maintaining the power input to the LEDs close to the level needed to drive them properly. The controllers adapt the voltage headroom over time and temperature automatically for maximum efficiency.
The AS1390A is a high-power, constant-frequency boost controller with an integrated buck converter. It can be used for the boost converter in TV sets which are optimized for 2D and 3D mode. The continuous conduction mode of the AS1390A provides superior bandwidth and transient response. The two output voltages for the boost controller (2D and 3D mode) can be programmed with an external resistor divider. The buck converter is optimized for suppling a /P with 5V. The AS1390A is available in a 20-Pin QFN (4x4mm) package.
The AS1390B is a high-power, constant-frequency boost controller with an integrated buck converter. It is designed for single mode operation. The continuous conduction mode of the AS1390B provides superior bandwidth and transient response. The two output voltages for the boost controller (2D and 3D mode) can be programmed with an external resistor divider. The buck converter is optimized for suppling a /P with 5V. AS1390B is available in a 16-pin SOIC package.
Power Management Units
These highly integrated, flexible power management units are ideal for use in portable, battery-powered devices.
The AS3701 is a small microPMIC for small size and low power applications. AS3701 features one 500mA DC-DC buck converter operating at 1MHz up to 4MHz, two 200mA LDOs, two 40mA current sinks and offers additional GPIO functions. Further, the device contains an integrated power path management linear battery charger with constant current and constant voltage operation. The wide charging current range going from 11mA up to 500mA and the integrated battery temperature monitoring with selectable NTC beta values make this device suitable for a great variety of applications. The single supply voltage may vary from 2.7V to 5.5V and all functionalities of AS3701 can be controlled via the I2C interface.
The AS3709 features 5 high-efficiency, constant-frequency synchronous buck converters and two universal LDOs. The input voltage range (2.7V to 5.5V), automatic power save mode and minimal external component requirements make the AS3709 perfect for any single Li-ion battery-powered or fixed 3.3V/5V supply application.
The programmable power management unit AS3711 features 3x DC-DC buck converters, 1x 3A buck converter, 2x boost converters, 1.5A Li-ion charger and programmable current bypass switch off the USB input, 8 low noise LDOs and a general purpose ADC. The high level of integration and the 4MHz switching fequencies ensure small system footprint.
ams analog switches provide dual and quad options to the end user, providing numerous switching configurations for routing analog signals accurately and fast.
The AS1747 SPDT (single-pole/double-throw) switch allows signals below ground to pass through without distortion, ideal for switching audio signals, due to the supply voltage from +1.8V to +5.5V and the low 0.4Ω on-resistance. This SPDT switch is available in space-saving 10-pin TDFN 3x3 packages and operate over the -40ºC to +85ºC extended temperature range.
Flash drivers combine integrated safety features with high current capability. They are suitable for use in small system solutions for smartphones, tablets and cameras.
The AS3630 is a high efficient 4MHz dual DC-DC step-up converter to supply 8A LED flash. It supports the charging of a supercap, its voltage balancing and a highly efficient DC-DC step-up from the supercap to the LED and from VIN to the LED to power the flash LED with up to 8A. The system concept supports an immediate torch function without first charging the supercap. The AS3630 includes flash timeout, over- and undervoltage, overtemperature and LED short circuit protection.
The AS3635 is a highly integrated photoflash charger with built-in IGBT driver. A build in 5V charge pump guarantees constant IGBT drive at any battery voltage. The built-in timer turns off the charge pump 20 seconds after charging. In circuit fuse trimming allows to set the voltage on the photoflash capacitor to ±3% accuracy.
The AS3636 is a highly integrated photoflash charger including IGBT driver, inductive DC-DC boost autofocus/video LED driver, an indicator LED driver and it includes system level ESD protection and a breakable fuse. The AS3636 includes flash timeout, over- and undervoltage, overtemperature and LED short circuit protection functions.
Smart Notification Light
Smartlight solutions produce lighting effects which enable manufacturers of mobile phones and other portable devices to differentiate their products. Offering programmable features, the smartlight products control backlighting, fun lighting and functional lighting operations.
The AS3661 is a 9-channel LED driver designed to produce lighting effects for mobile devices. A high efficiency charge pump enables LED driving over full Li-ion battery voltage range. The device is equipped with an internal program memory, which allows operation without processor control.
The AS3665 is a capacitive low noise charge pump with 9 current sources. The internal control is done by command based pattern generators implemented by three sequencers. These commands are optimized for lighting applications (e.g. ramp up brightness logarithmically). It includes high level commands like conditionals jumps and variables.
The AS3668 is a 4-channel LED driver designed to produce lighting effects for portable devices. A highly efficient charge pump enables LED driving over full Li-ion battery voltage range. The device is equipped with an internal program memory, which allows control of LED patterns even without processor control.
DC-DC Buck Converters
The step down (buck) converter portfolio offers very high efficiencies of up to 96%. High switching speeds enable the use of very small external inductors. The DC-DC buck converters handle high input voltages of up to 32V.
The AS1313 has a load current capability of 150mA with an ultra-low quiescent current of 1µA hysteretic DC-DC step-down converter. The AS1313 is optimized for light loads and with efficiencies of up to 95%. In order to save power the AS1313 features a shutdown mode, where it draws less than 100nA. In shutdown mode the battery is not connected to the output. In light load operation, the device enters an idle mode when most of the internal operating blocks are turned off in order to save power. This mode is active approximately 100μs after a current pulse provided that the output is in regulation. The AS1313 is available in a 8-pin (2x2) MLPD and a 0.4mm pitch 6-pin WL-CSP package.
The AS1341 is a hysteretic buck converter, capable of driving 600mA at 1.25V to Vin output. With efficiencies up to 96%, the device operates between 4.5V to 20V input.
The AS1382 is a high-efficiency, constant-frequency synchronous buck converter available in adjustable and fixed-voltage versions. The wide input voltage range (2.7V to 5.5V), automatic power save mode and minimal external component requirements make the AS1382 perfect for any single Li-ion battery-powered application. Typical supply current with no load is 95μA and decreases to 0.04μA in shutdown mode. An internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. The internally fixed switching frequency (2MHz, 3MHz or 4MHz) allows the usage of small surface- mount external components. Very low output voltages can be delivered with the internal 0.6V feedback reference voltage. The AS1382 is available in a 6-pin WL-CSP package.
DC-DC Boost Converters
The ams step-up (boost) converter portfolio offers very high efficiencies of up to 96%, and the devices draw a very low quiescent current. High switching speeds enable the use of very small external inductors. These DC-DC boost converters can boost the input from a single battery cell to an output of up to 42V.
The AS1312 is an ultra low IQ hysteretic DC-DC step-up converter. The AS1312 achieves an efficiency of up to 94% and is designed to operate from a +0.7V to +5.0V supply, the output voltage is fixed in 50mV steps from +2.5V to 5.0V. In order to save power the AS1312 features a shutdown mode, where it draws less than 100nA. In shutdown mode the battery is not connected to the output. If the input voltage exceeds the output voltage the device is in a feedthrough mode and the input is directly connected to the output voltage. In light load operation, the device enters a sleep mode when most of the internal operating blocks are turned off in order to save power. This mode is active approximately 50μs after a current pulse provided that the output is in regulation. The AS1312 also offers an adjustable low battery detection. If the battery voltage decreases below a threshold defined by two external resistors on pin LBI, the LBO output is pulled to logic low. LBO is working as Power-OK when LBI is connected to GND. The AS1312 is available in a 8-pin (2x2) TDFN and a 0.4mm pitch 8-pin WL-CSP package.
The AS1326 is a sychronous boost converter, capable of driving 620mA at 5V. With efficiencies up to 96% the device operates from 0.7V to 5V input to generate 2.5V to 5V output.
The AS1340 is a hysteretic boost converter, capable of 1.2W output off 3.3V input. With efficiencies up to 90%, the device operates from 2.7V to 5.5V input to generate 2.7V to 50V output.
ams Low Dropout (LDO) linear regulators support a wide range of portable and battery-powered applications including RF equipment.
The AS1353 is a triple 300mA linear voltage regulator with superior load and line regulation. Designed to operate off 2.3V to 5.5V input, the device generates 1.25V to 3.6V output.
The AS1364 is a single 1A linear voltage regulator with 35µA quiescent current. The devide operates off 2V to 5.5V input and generates an output voltage between 1.2V and 5V.
The AS1374 is a dual 200mA linear voltage regulator with 30µA quiescent current. The devide operates off 2V to 5.5V input and generates an output voltage between 1.2V and 3.6V.
ams supervisors offer high accuracy and low power consumption. In battery-powered systems in particular, the supply must be monitored in order to perform safe start-up and shut-down operations.
The AS1917 (push-pull driver with active high reset) is a supervisor with manual reset and watchdog. Reset thresholds are factory programmable between 1.8V and 3.6V in steps of 100mV. The duration of the reset is fixed at 215ms, watchdog timeout is 1.5s. The device operates down to 1V.
Operational amplifiers from ams are ideally suited to audio applications.
The AS1712 is a quad low-offset, CMOS op amp with integrated shutdown delivering 200mA of peak output current with 10V/µs slew rate and 10MHz bandwidth, from a single supply (2.7V to 5.5V) over the automotive temp range (-40°C to +125°C). Specifically designed to drive headsets (32Ω), as well as bias RF power amplifiers for wireless handset applications.