AME5144 Datasheet, PDF (3/15 Pages) AMETHERM Circuit Protection Thermistors – High Efficiency, 37V Step-Up Converter for 2 to 10 White LEDs

AME
AME5144
High Efficiency, 37V Step-Up
Converter for 2 to 10 White LEDs
n Pin Configuration
DFN-8C
(3mmx3mmx0.75mm)
Top View
8 765
AME5144
1 234
AME5144-AVAxxx
1. OUT
2. IN
3. CTRL
4. CS
5. COMP
6. GND
7. PGND
8. SW
* Die Attach:
Conductive Epoxy
n Pin Description
Pin Number Pin Name
1
OUT
2
IN
3
CTRL
4
5
6
7
8
Rev.D.01
CS
COMP
GND
PGND
SW
Pin Description
Overvoltage Sense. When OUT is greater than 38.5V(Typ.), the internal n-
channel MOSFET turns off until OUT drops below 37V(Min), then the IC reenters
soft-start Connect a 0.1uf ceramic capacitor from OUT to ground. In shutdown,
V_OUT is one diode drop below V_IN.
Input Voltage Supply^C. The input voltage range is 2.6V to 5.5V. Connect a
2.2uF ceramic capacitor from IN to GND.
Brightness Control pi_in_e. Either an Analog or PWM control signal can be used.
The PWM signal must be between 200Hz and 30KHz. Varying the voltage from
+0.24V to +1.65V adjusts the brightness from dim to 100% brightness,
respectively. Any voltage above +1.65V does not increase brightness. Hold
CTRL below 100mV to shut down the IC after an 8.2ms delay.
Current Sense Feedback input. Connect a resistor from CS to GND to set the
LED bias current. The voltage at CS regulates to V_CRTL/5 or 0.330V.
Compensation input. Connect a 0.1µF Ceramic Capacitor(Ccomp) from COMP
to GND. C_comp stabilizes the converter, controls soft-start and lowpass filters
direct PWM dimming at CTRL. Ccomp discharges to 0V through an internal
20KΩ resistor in showdown.
Ground. Connect to PGND and exposed pad directly under the IC.
Power Ground. Connect to PGND and exposed pad directly under the IC.
Inductor Connection. Connect SW to the node between the inductor and
schottky diode. SW is high impedance in shutdown.
3