AME5130 Datasheet | Analog Microelectronics

.. AME, Inc. Micropower Step-Up DC/DC Converter n General Description The AME5130 is a fixed off-time step-up DC/DC converter in a small 5-lead SOT-25 package.The AME5130 is ideal for LCD panels requiring low current and high efficiency as well as LED applications for cellular phone backlighting, PDAS,and other hand-held devices. The low 400ns off-time allows the use of tiny external ponents. AME5130 can drive up 8 white LEDs from a single Li Ion battery DC 2V to 5.5V; can be turned on by putting more than 1V at pin 4(RUN). To control LED brightness, the LED current can be pulsed by applying a PWM (pulse width modulated) signal with a frequency range of 100Hz to 50KHz to the RUN pin. n Typical Application V IN 2.5V-4.2V 5 V IN L 10µH 1 SW ILED COUT 4.7µ F Ceramic AME5130 D Option for 6LEDs CIN 4.7µF Ceramic >1.1V 4 RUN 0V GND 2 FB 3 R2 80Ω - ILED =VFB/R2 n Features l 0.7Ω internal switch l Uses small surface mount ponents l Adjustable output voltage up to 20V l 2V to 5.5V input range l Input undervoltage lockout l 0.01µA shutdown current l Small 5-Lead SOT-25 package Figure 1¡G Six White LEDs Application in Li-lon Battery V IN 2.5V-4.2V L 15µ H 20V 20m A 5 CIN 4.7µF Ceramic 4 VIN 1 SW 3 R1 510K AME5130 FB RUN GND 2 COUT 4.7µ F Ceramic R2 33K n Applications l l l l l White LED Back-Lighting Hand-held Devices Digital Cameras Portable Applications LCD Bias Power Figure 2¡G Typical 20V Application AME, Inc. Micropower Step-Up DC/DC Converter n Function Block Diagram L VIN CIN VIN SW D VOUT COUT V OUT Vref=1.23 Enable p R1 + R2 400ns one Shot Internal Soft Start + CL p Current sensing Driver Under Voltage Lockout Logic...