SGM3122 Datasheet, PDF (3/17 Pages) SG Micro Corp – PWM Brightness Control

SGM3122
White LED Charge Pump Current
Source with PWM Brightness Control
PIN CONFIGURATION (TOP VIEW)
C2- C1- C1+ C2+
12 11 10 9
VIN 13
8 VOUT
GND 14
EN1 15
GND
7 PGND
6 D1
EN2 16
12
ISET NC
5 D2
34
D4 D3
TQFN-3×3-16L
PIN DESCRIPTION
PIN
1
2
3-6
7
8
9
10
11
12
13
14
15
16
—
NAME
ISET
NC
D1 - D4
PGND
VOUT
C2+
C1+
C1-
C2-
VIN
GND
EN1
EN2
Power
PAD
I/O
FUNCTION
I
Connect a resistor between this pin and GND to set the maximum current through the
LEDs.
- No internal connection.
I Current sink input. Connect the cathode of the white LEDs to these inputs.
- Power ground.
O Connect the output capacitor and the anode of the LEDs to this pin.
- Connect to the flying capacitor C2.
- Connect to the flying capacitor C1.
- Connect to the flying capacitor C1.
- Connect to the flying capacitor C2.
I Supply voltage input.
- Analog ground.
I
Enable input. A logic high enables the converter, logic low forces the device into
shutdown mode reducing the supply current to less than 1μA if EN2 is tied to GND.
An applied PWM signal reduces the LED current as a function of the duty cycle of the
I
PWM signal. EN1 and EN2 can be tied together for PWM dimming between 0mA and the
maximum set with ISET. EN1 and EN2 can also be used for digital dimming with 4 steps
from 0mA to the maximum current set with ISET.
Connect with PGND and GND.
SG Micro Corp
3
www.sg-micro.com