LP3933 Datasheet, PDF (16/18 Pages) National Semiconductor (TI) – Lighting Management System for Six White LEDs and Two RGB or FLASH LEDs

Recommended External Components (Continued)
List of Recommended External Components
Symbol
Symbol Explanation
C_VDD1
C_VDD2
C_OUT
C_IN
C_VDDIO
RT
V_DD1 Bypass Capacitor
V_DD2 Bypass Capacitor
Output Capacitor from FB to GND
Input Capacitor from Battery Voltage to GND
V_{DD_IO} Bypass Capacitor
Oscillator Frequency Bias Resistor
RSO
SO Output Pull-up Resistor
C_VREF
L_BOOST
D_OUT
RGB1
Reference Voltage Capacitor, between V_REF and GND
Boost Converter Inductor
Rectifying Diode, V_F @ Maxload
RGB LED1
RGB2
RGB LED2
R_R1, R_G1, R_B1
R_R2, R_G2, R_B2
LEDs
Current Limit Resistor
Current Limit Resistor
White LEDs
Value
100
100
10
10
100
82
100
100
10
0.3
Unit
Type
nF Ceramic, X7R
nF Ceramic, X7R
µF Ceramic, X7R/Y5V
µF Ceramic, X7R/Y5V
nF Ceramic, X7R
kΩ 1% (Note 18)
kΩ
nF Ceramic, X7R
µH Shielded, Low ESR, I_SAT A1A
V Schottky Diode
User Defined
(See Application Note 1291 for resistor size calculation)
Note 18: Resistor RT tolerance change will change the timing accuracy of RGB block. Also the boost converter switching frequency will be affected.
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