GENERAL DESCRIPTION
AME5170 is designed to drive up to four white LEDs in series with a constant current from a single Li-lon battery. To control LED brightness, the LED current can be adjusted by applying a PWM (pulse width modulated) signal with a frequency range of 100Hz to 50KHz to the EN pin. Low Cost Micro Power Boost DC/DC Converter n Typical Application VIN 1.5V to 5V CIN 4.7µF L1 2.2µH VOUT = 5V COUT 4.7µF R1 100KΩ EN CF 20pF IN SW AME5170 FB GND R2 33KΩ Figure.1 Typical 5V Application VIN 1.5V to 5.5V CIN 4.7µF L1 10µH n FEATURES
l 0.7Ω Internal Switch l Use Small Surface Mount Components l Adjust Output Voltage up to 28V l Input under Voltage Lockout l 0.1µA Shutdown Current Typical l Small SOT-25 Package l All AME's Lead Free Products Meet RoHS Standards VOUT = 12V COUT 1µF R1 240K Ω IN SW AME5170 EN GND FB R2 27K Ω Figure.2 Typical 12V Application n APPLICATIONS
l LCD Bias Supplies l White LED Back-Lighting l Handheld Devices l Digital Cameras l Portable APPLICATIONS
EN VIN 1.5V to 5.5V CIN 4.7µF L1 10µH VOUT = 20V COUT 1µF R1 510KΩ IN SW AME5170 FB GND R2 33KΩ Figure.3 Typical 20V Application Rev.A.02 1 AME, Inc.
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