LM2619ATLX National Semiconductor, LM2619ATLX Datasheet
LM2619ATLX
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LM2619ATLX Summary of contents
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... A high switching frequency (600kHz) allows use of tiny surface-mount com- ponents. The device features external compensation to tailor the re- sponse to a wide range of operating conditions. © 2003 National Semiconductor Corporation Key Specifications n Operates from a single LiION cell (2.8V to 5.5V) n Output voltage (1.5V to 3.6V) ± ...
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Typical Application Circuits www.national.com FIGURE 1. Typical Circuit for 1.8V Output Voltage FIGURE 2. Typical Circuit for 2.5V Output Voltage FIGURE 3. Typical Circuit for 1.5V Output Voltage 2 20057401 20057402 20057403 ...
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... Ordering Information Order Number Package Type LM2619ATL 10-bump Wafer Level Chip Scale (micro SMD) LM2619ATLX (*) XY - denotes the date code marking (2 digit) in production (*) TT - refers to die run/lot traceability for production (*) S - product line designator Package markings may change over the course of production. Pin Description ...
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... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. PVIN, VDD to SGND PGND to SGND, PVIN to VDD EN, EAOUT, EANEG, SYNC/MODE to SGND FB, SW Electrical Characteristics Specifications with standard typeface are for T perature Range − ...
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Typical Performance Characteristics less otherwise noted. Quiescent Supply Current vs Supply Voltage Output Voltage vs Supply Voltage (V = 1.5V, PWM MODE) OUT Output Voltage vs Output Current (V = 1.5V, PWM MODE) OUT LM2619ATL, Circuit of Figure 3, V ...
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Typical Performance Characteristics otherwise noted. (Continued) Output Voltage vs Output Current (V = 3.6V, PWM MODE) OUT (Circuit in Figure 4) Switching Frequency vs Temperature (Circuit in Figure 3, PWM MODE) www.national.com LM2619ATL, Circuit of Figure 3, V Dropout Voltage ...
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Typical Performance Characteristics otherwise noted. (Continued) Efficiency vs Output Current (V = 1.5V, PWM MODE) OUT Efficiency vs Output Current (V = 3.6V, PWM MODE) OUT (Circuit in Figure 4) Device Information The LM2619 is a simple, step-down DC-DC converter ...
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Device Information (Continued) external components. Board area required for implementa tion is only 0.58in (375mm ). Use of a micro-SMD package requires special design con- siderations for implementation. (See Micro SMD Package FIGURE 4. Typical Operating Circuit for ...
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Device Information (Continued) PWM OPERATION While in PWM (Pulse Width Modulation) mode, the output voltage is regulated by switching at a constant frequency and then modulating the energy per cycle to control power to the load. Energy per cycle is ...
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... PFM error comparator. Thus, the output voltage ripple in PFM mode is proportional to the hysteresis of the error comparator. In PFM mode, the device only switches as needed to service the load. This lowers current consumption by reducing power consumed during the switching action in the circuit, due to transition losses in the internal MOSFETs, gate drive cur- rents, eddy current losses in the inductor, etc ...
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... If an excessive load pulls the voltage at the feedback pin down to approximately 0.7V, then the device switches to a timed current limit mode. In timed current limit mode the internal P-FET switch is turned off after the current comparator trips and the beginning of the next cycle is inhibited for 2.5µ ...
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Application Information SETTING THE OUTPUT VOLTAGE The LM2619 can be used with external feedback resistors to set the output voltage.Select the value allow atleast 100 times the feedback pin bias current to flow through it ...
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... MICRO SMD PACKAGE ASSEMBLY AND USE Use of the micro SMD package requires specialized board layout, precision mounting and careful reflow techniques, as detailed in National Semiconductor Application Note AN- 1112. Refer to the section Surface Mount Technology (SMT) Assembly Considerations. For best results in assembly, alignment ordinals on the PC board should be used to facilitate placement of the device ...
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Application Information 7. Place noise sensitive circuitry, such as radio IF blocks, away from the DC-DC converter, CMOS digital blocks and other noisy circuitry. Interference with noise- sensitive circuitry in the system can be reduced through distance. In mobile phones, ...
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... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...