LM4802BLQ National Semiconductor, LM4802BLQ Datasheet
LM4802BLQ
Specifications of LM4802BLQ
Available stocks
Related parts for LM4802BLQ
LM4802BLQ Summary of contents
Page 1
... Low, 12mA (typ) quiescent current n 12Vp-p mono BTL output, load = 2µF + 30Ω Short circuit protection n Unity-gain stable n External gain configuration capability Applications n Cellphone n PDA LM4802BLQ (5x5) Top View Order Number LM4802BLQ See NS Package Number 2LQAQ028 DS200941 March 2005 12mA (typ) 12Vp-p (typ) 2µA (max 20094184 ...
Page 2
Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com 20094110 2 ...
Page 3
... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( Supply Voltage ( Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Electrical Characteristics V The following specifications apply for V otherwise specified ...
Page 4
Electrical Characteristics V The following specifications apply for V otherwise specified. Limits apply for T Symbol Parameter THD+N Total Harmomic Distortion + Noise e Output Noise OS PSRR Power Supply Rejection Ratio V Feedback Pin Reference Voltage FB Note 1: ...
Page 5
Typical Performance Characteristics THD+N vs Frequency 2µF + 30Ω THD+N vs Output Voltage 2µF + 30Ω THD+N vs Output Voltage V = 3V, Z ...
Page 6
Typical Performance Characteristics THD+N vs Output Voltage 2µF + 30Ω Load Current vs V PSRR vs Frequency V = 5.0V 2µF + 30Ω 200mV , A ...
Page 7
Typical Performance Characteristics PSRR vs Frequency V = 6.1V 2µF + 30Ω 200mV , A ripple pp V-BTL Power Derating Curve - LLP P = 136mW DMAX V = 4.2V 2µF + ...
Page 8
Typical Performance Characteristics Amplifier Frequency Response vs Input Capacitor Size Oscillator Frequency vs Temperature - “X” Feedback Bias Current vs Temperature www.national.com (Continued) 20094102 20094104 20094109 8 Switch Current Limit vs Duty Cycle - “X” 20094103 Feedback Voltage vs Temperature ...
Page 9
Typical Performance Characteristics Temperature (Continued) 20094107 20094108 www.national.com ...
Page 10
... This plane forms a thermal mass, heat sink, and radiation area. Further detailed and specific information con- cerning PCB layout, fabrication, and mounting an LD (LLP) package is found in National Semiconductor’s Package En- gineering Group under application note AN1187 ...
Page 11
Application Information SHUTDOWN FUNCTION In many applications, a microcontroller or microprocessor output is used to control the shutdown circuitry to provide a quick, smooth transition into shutdown. Another solution is to use a single-pole, single-throw switch, and a pull-up resistor. ...
Page 12
Application Information SETTING THE OUTPUT VOLTAGE (V CONVERTER The output voltage is set using the external resistors R1 and R2 (see Figure 1). A value of approximately 13.3kΩ is rec- ommended for R2 to establish a divider current of approxi- ...
Page 13
Application Information CALCULATING OUTPUT CURRENT OF BOOST CONVERTER (I ) AMP As shown in Figure 2 which depicts inductor current, the load current is related to the average inductor current by the relation (AVG ...
Page 14
Application Information www.national.com (Continued) FIGURE 3. Demo Board Reference Schematic 14 20094183 ...
Page 15
Demonstration Board Layout Composite Layer Top Layer 15 200941A0 200941A1 www.national.com ...
Page 16
Demonstration Board Layout www.national.com (Continued) Top Overlay Bottom Layer 16 200941A2 20094199 ...
Page 17
... Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 LQ Package Order Number LM4802BLQ NS Package Number LQA28A 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...