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MAX1578 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1578 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 13 page Complete Bias and White LED Power Supplies for Small TFT Displays 6 _______________________________________________________________________________________ -5.0 -3.5 -4.0 -4.5 -3.0 -2.5 -2.0 -1.5 -1.0 POS NEG -0.5 0 040 20 60 80 100 POS AND NEG LOAD REGULATION LOAD CURRENT ( µA) -0.6 -0.4 -0.5 -0.2 -0.3 -0.1 0 025 MAIN OUTPUT LOAD REGULATION LOAD CURRENT (mA) 10 515 20 PIN NAME FUNCTION 1 MAIN LDO Output and the POS and NEG Charge-Pump Inputs. VMAIN is regulated to 5V. Bypass to GND with a 1µF capacitor. Output is internally discharged with a 1k Ω resistor when VONBIAS = 0V. 2 CU1 POS Charge-Pump Capacitor Connection 1. Connect a 1µF capacitor between CU1 and PMP. 3 CU2 POS Charge-Pump Capacitor Connection 2. Connect a 1µF capacitor between CU2 and PMPB. 4 CU3 POS Charge-Pump Capacitor Connection 3. Connect a 1µF capacitor between CU3 and GND. 5 POS Output of Positive (3x) Charge Pump. Bypass POS to GND with a 1µF capacitor. POS is internally discharged with a 3k Ω resistor when VONBIAS = 0V. 6PMP Charge-Pump Capacitor Connection. Connect a 1µF capacitor between PMP and CU1 and another 1µF capacitor between PMP and CD1. 7 PMPB 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. 8 CD1 NEG Charge-Pump Capacitor Connection 1. Connect a 1µF capacitor and a 200 Ω ±5% resistor in series between CD1 and PMP. 9 CD2 NEG Charge-Pump Capacitor Connection 2. Connect a 1µF capacitor and a 200 Ω ±5% resistor in series between CD2 and PMPB. 10 NEG Output of Inverting (-2x) Charge Pump. Bypass NEG to GND with a 1µF capacitor. Output is internally discharged with a 1.5k Ω resistor when VONBIAS = 0V. Pin Description Typical Operating Characteristics (continued) (Circuit of Figure 3, VIN = 3.6V, ILED = 20mA, 4 LEDs, CTRL = IN, TA = +25 °C, unless otherwise noted.) |
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Similar Description - MAX1578 |
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