LM2635MX National Semiconductor, LM2635MX Datasheet
LM2635MX
Specifications of LM2635MX
LM2635MXTR
Available stocks
Related parts for LM2635MX
LM2635MX Summary of contents
Page 1
... Typical Application FIGURE 1.8V–3.5V, 14A Power Supply Pentium ™ trademark of Intel Corporation. © 2005 National Semiconductor Corporation 2% over temperature is available externally for use by other regulators. Dynamic positioning of load voltage, which helps cut the number of output capacitors, can also be imple- mented easily. ...
Page 2
Connection Diagram TOP VIEW Plastic SO-20 Order Number LM2635M See NS Package Number M20B Pin Descriptions LSGATE (Pin 1): Gate drive for the low-side N-channel MOSFET. This signal is interlocked with HSGATE (Pin 20) to avoid a shoot-through problem. BOOTV ...
Page 3
TABLE 1. VID Code and DAC Output V ID4 ...
Page 4
... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (All voltages are referenced to the PGND and SGND pins BOOTV Junction Temperature DC Power Dissipation (Note 2) Storage Temperature Electrical Characteristics unless otherwise indicated under the Conditions column. Typicals and limits appearing in plain type apply for T ...
Page 5
Electrical Characteristics unless otherwise indicated under the Conditions column. Typicals and limits appearing in plain type apply for +25˚C. Limits appearing in boldface type apply over 0˚C to +70˚C. J Symbol Parameter V ...
Page 6
Block Diagram Test Circuit www.national.com FIGURE 2. 6 10011902 10011904 ...
Page 7
Applications Information OVERVIEW The LM2635 is a high speed synchronous PWM buck regu- lator controller designed for VRM vendors or motherboard manufacturers who need to build on-board power supplies for Cyrix MII, Pentium II or Deschutes microprocessors. It has a ...
Page 8
Applications Information output voltage level is fed to the error amplifier. The output of the error amplifier is then internally generated PWM ramp signal and the result of the comparison is a series of pulses with certain duty ratios. These ...
Page 9
Applications Information The control-to-output transfer function is The ESR zero frequency is: The power stage double pole frequency is: The corresponding Bode plots are shown in Figure 5. FIGURE 5. Control-to-Output Bode Plots Since the ESR zero frequency is so ...
Page 10
Applications Information driving capability of the error amplifier is limited to around 3 mA good idea to have a high impedance path from the output of the error amplifier to the output of the converter. From the ...
Page 11
Applications Information INDUCTOR SELECTION The size of the output is determined by a number of param- eters. Basically the larger the inductor, the smaller the output ripple voltage, but the slower the converter’s response speed during a load transient. On ...
Page 12
Applications Information connected between the FB pin and ground to increase the no load output voltage to close to the upper limit of the window. FIGURE 8. Dynamic Voltage Positioning by Using A Stand-Alone Resistor A possible drawback of the ...
Page 13
... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...