MAX1579 Maxim Integrated Products, MAX1579 Datasheet - Page 6

• Manufacturer Part Number: MAX1579
• Description: Complete Bias and White LED Power Supplies for Small TFT Displays
• Manufacturer: Maxim Integrated Products

Complete Bias and White LED Power Supplies
for Small TFT Displays
(Circuit of Figure 3, V
6
_______________________________________________________________________________________
PIN
10
1
2
3
4
5
6
7
8
9
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
0
0
NAME
PMPB
MAIN
PMP
NEG
CU1
CU2
CU3
POS
CD1
CD2
MAIN OUTPUT LOAD REGULATION
IN
= 3.6V, I
5
LOAD CURRENT (mA)
10
LDO Output and the POS and NEG Charge-Pump Inputs. V
with a 1µF capacitor. Output is internally discharged with a 1kΩ resistor when V
POS Charge-Pump Capacitor Connection 1. Connect a 1µF capacitor between CU1 and PMP.
POS Charge-Pump Capacitor Connection 2. Connect a 1µF capacitor between CU2 and PMPB.
POS Charge-Pump Capacitor Connection 3. Connect a 1µF capacitor between CU3 and GND.
Output of Positive (3x) Charge Pump. Bypass POS to GND with a 1µF capacitor. POS is internally
discharged with a 3kΩ resistor when V
Charge-Pump Capacitor Connection. Connect a 1µF capacitor between PMP and CU1 and another
1µF capacitor between PMP and CD1.
Charge-Pump Capacitor Connection. Connect a 1µF capacitor between PMPB and CU2 and another
1µF capacitor between PMPB and CD2. PMPB is 180° out of phase with PMP.
NEG Charge-Pump Capacitor Connection 1. Connect a 1µF capacitor and a 200Ω ±5% resistor in
series between CD1 and PMP.
NEG Charge-Pump Capacitor Connection 2. Connect a 1µF capacitor and a 200Ω ±5% resistor in
series between CD2 and PMPB.
Output of Inverting (-2x) Charge Pump. Bypass NEG to GND with a 1µF capacitor. Output is internally
discharged with a 1.5kΩ resistor when V
LED
= 20mA, 4 LEDs, CTRL = IN, T
15
20
Typical Operating Characteristics (continued)
25
A
= +25°C, unless otherwise noted.)
ONBIAS
ONBIAS
FUNCTION
= 0V.
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
= 0V.
0
0
POS AND NEG LOAD REGULATION
20
MAIN
LOAD CURRENT (µA)
40
is regulated to 5V. Bypass to GND
NEG
60
Pin Description
POS
80
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ONBIAS
100
= 0V.