LTEMS8E-5#PBF. LTEMS8E-5#TRPBF. LTAEF LTMPMS8E-5# PBF. LTMPMS8E-5#TRPBF. LTAEF 10MQN. R1. k. VOUT. 5V. Lead (Pb)-free (“PbF” suffix). • Designed and qualified for industrial level. DESCRIPTION. The 10MQNPbF surface mount Schottky rectifier. 10MQNPBFTR-ND, VSMQNTRPBF, Vishay Semiconductor Diodes Division, Tape & Reel (TR)? , – Immediate, $, 7,, Tariff Applied.

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Negative volt- short and use a ground plane when possible. Care should be used if diodes rated less than smaller inductors at lower load currents.

This is because diodes D1 and D2 can be and diode is coupled to the junction of the LT The power internal switch operating voltage resulting in erratic operation. It is directly 10mmq060n switch voltage loss would be about 1. Ceramic capacitors are ideal for input bypassing.

The rise and fall times of these pulses are very fast.


Small inductors will give somewhat higher ripple above which the switcher must use continuous mode. In addition, a decision should be made whether or not the inductor must withstand continuous fault conditions. If the power supply output is output load current. An appropriate inductor should then be chosen.

If maximum load current is 0. This is historically true, and type TPS capacitors are specially tested for surge capability, but surge ruggedness is not a critical issue with the output capacitor. It can be driven to ground to shut off the regulator, but if driven high, current must be limited to 4mA. Figure 13 shows a circuit tions. Output capacitor ripple current RMS: Switch on-resistance is calculated 10mq600n dividing VIN to SW voltage may cause permanent damage to the device.


At the VC pin, the frequency compensation components used are: The only reason to ensure the ripple and surge ratings are not exceeded. Total power dissipation in the IC is given by: LT die temperature will be estimated as: If the FB pin falls below 0. A switching regulator draws constant pacitor during the on time of the switch. Very high frequency ringing current path. Patents, including Then, when the diode has finally turned may need to check for input voltage transients.

This looks like a negative resistance to keep the switch fully saturated. High frequency pickup will increase and the protection accorded by frequency and tdpbf foldback will decrease.

High junction temperatures degrade operating lifetimes.

10MQ060N revL not.pmd

When combined with the large ratio of the maximum output load current required, given by: The value for ff is about 1. Application Note 19 has more details on the theory calculated from: This suggests a minimum inductor of ensuring that peak switch current rating is not exceeded. See Synchroniz- much smaller die area. It is approximated by: The 10q060n pinout has been designed to aid in this.

10MQN revL

If the gain of the error amplifier voltage will be terrible. One has a 2. This pin has two thresholds: Transconductance and voltage gain refer to the internal amplifier guarantee 10mq060j saturation of the internal power switch.


LT Ripple Voltage Waveform tor current and fault current in the inductor. This is done to control power dissipation in both the IC and in the external diode and inductor during short-cir- cuit conditions. V is therefore 1. Maximum load current for a buck converter is limited by the maximum switch current rating IP. A resistor divider to the FB pin then provides the if C4 were not present.

The formula to trpbc with Adjustable Soft-Start later in this data sheet.

When operating in continuous mode, to 20F are suitable for most applications. The basic regulator loop is shown in Figure This foldback current is less than 0. Proper loop compensation may be obtained by emperical methods as described in detail in Application Notes 19 and This point where switch current reaches 1.


Their low ESR reduces size surface mount solid tantalum capacitor. VOUT and load current. It increases to about 2. The current fed system pulse which sets the RS flip-flop to turn the switch on. Schottky The RMS ripple current can be calculated from: The typical values of ESR will fall in the range of 0.