ame5144 AME, Inc., ame5144 Datasheet - Page 3

• Manufacturer Part Number: ame5144
• Description: High Efficiency, 37v Step-up Converter For 2 To 10 White Leds
• Manufacturer: AME, Inc.

n Pin Description
AME5144
n Pin Configuration
Rev.D.01
Pin Number
1
2
3
4
5
6
7
8
(3mmx3mmx0.75mm)
AME
8
1
AME5144
Top View
DFN-8C
7
2
Pin Name
COMP
PGND
CTRL
GND
OUT
SW
CS
6
3
IN
5
4
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
Input Voltage Supply. The input voltage range is 2.6V to 5.5V. Connect a
2.2uF ceramic capacitor from IN to GND.
Brightness Control pin. 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
Compensation input. Connect a 0.1 F Ceramic Capacitor(Ccomp) from COMP
to GND. C
direct PWM dimming at CTRL. Ccomp discharges to 0V through an internal
20K
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.
OUT
AME5144-AVAxxx
1. OUT
2. IN
3. CTRL
4. CS
5. COMP
6. GND
7. PGND
8. SW
is one diode drop below V
resistor in showdown.
comp
stabilizes the converter, controls soft-start and lowpass filters
i e
C
Converter for 2 to 10 White LEDs
* Die Attach:
Conductive Epoxy
Pin Description
IN
High Efficiency, 37V Step-Up
.
CRTL
/5 or 0.330V.
3