MAX1573 Maxim Integrated Products, MAX1573 Datasheet - Page 4

• Manufacturer Part Number: MAX1573
• Description: White LED 1x/1.5x Charge Pump
• Manufacturer: Maxim Integrated Products

White LED 1x/1.5x Charge Pump in UCSP
(V
4
PIN
A1
A2
A3
A4
B1
B2
B4
C1
C3
C4
D1
D2
D3
D4
IN
_______________________________________________________________________________________
= 3.6V, EN1 = EN2 = IN, C
NAME
LED4
LED2
LED3
LED1
GND
OUT
C2N
C1N
C1P
EN1
EN2
C2P
SET
IN
Transfer Capacitor 1 Positive Connection. See the Component Selection section for capacitor value.
Output. Bypass to GND with a 1µF ceramic capacitor. Connect to the anodes of all the LEDs. OUT is high
impedance during shutdown.
Enable, Dimming Control Input 1. EN1 and EN2 control shutdown and the LED current. See Table 1.
Enable, Dimming Control Input 2. EN1 and EN2 control shutdown and the LED current. See Table 1.
Transfer Capacitor 2 Negative Connection. See the Component Selection section for capacitor value.
Transfer Capacitor 2 Positive Connection. See the Component Selection section for capacitor value.
Bias-Current Set Input. Connect a resistor from SET to GND to set the LED bias current (I
Supply Voltage Input. IN supplies power for the IC. Bypass IN to GND with a 1µF ceramic capacitor.
LED4 Cathode Connection and Charge-Pump Feedback. The charge pump regulates to the lowest voltage on any of
the LED_ inputs. Connect LED4 to the cathode of one output LED. Connect LED4 to IN if this LED is not populated.
LED2 Cathode Connection and Charge-Pump Feedback. The charge pump regulates to the lowest voltage on any of
the LED_ inputs. Connect LED2 to the cathode of one output LED. Connect LED2 to IN if this LED is not populated.
Transfer Capacitor 1 Negative Connection. See the Component Selection section for capacitor value.
Ground
LED3 Cathode Connection and Charge-Pump Feedback. The charge pump regulates to the lowest voltage on any of
the LED_ inputs. Connect LED3 to the cathode of one output LED. Connect LED3 to IN if this LED is not populated.
LED1 Cathode Connection and Charge-Pump Feedback. The charge pump regulates to the lowest voltage on any of
the LED_ inputs. Connect LED1 to the cathode of one output LED. Connect LED1 to IN if this LED is not populated.
V
V
OUT
EN_
I
IN
STARTUP AND SHUTDOWN RESPONSE
IN
= C1 = C2 = C
500µs/div
LED_ = 4
EN1 = EN2
✕
MAX1573 toc10
17mA
Typical Operating Characteristics (continued)
OUT
= 1µF, R
5V/
div
50mA/
div
2V/
div
SET
= 7.50kΩ, T
FUNCTION
V
I
ENI1
OUT
A
= +25°C, unless otherwise noted.)
DIMMING RESPONSE
5µs/div
SET
EN2 = IN
Pin Description
MAX1573 toc11
). I
www.DataSheet4U.com
SET
= 600mV/R
2V/
div
50mA/
div
SET
.