5.0a, 300khz, step-down switching regulator lm1501b mar. 2011 ? ver. 1.2 1 htc absolute maximum ratings (t a = 25 o c) (note 1) characteristic symbol value unit maximum input supply voltage v i 45 v on/off pin input voltage v in -0.3 v +25 v feedback pin voltage v fb -0.3 v +25 v output voltage to ground v o -1 v power dissipation p d internally limited w storage temperature range t stg -65 to +150 o c operating temperature range t j -40 t j +125 o c esd susceptibility (human body model) v esd 2 kv operating supply voltage v in 4.5 to 45 v note 1. absolute maximum rating indicate limits beyond which da mage to the device may occur. operating ratings indicate conditi ons for which the device is intended to be functional, but do not guaran tee specific performance limits. for guaranteed specifications and test conditions, see the electr ical characteristics. to-263 pkg to-220 pkg ordering information device pkg lm1501br-x.x to-263 5l lm1501bt-x.x to-220 5l features z 3.3v, 5v, 12v, and adjustable output versions z adjustable version output voltage range, 1.23v to 37v 3% max over line and load conditions z guaranteed 5a output load current z input voltage range up to 40v z requires only 4 external components z 300khz 15% fixed frequency internal oscillator z excellent line and load regulation specifications z low power standby mode, i q typically 80ua z thermal shutdown and current limit protection application z simple high-efficiency step-down regulator z on-card switching regulators z positive to negative converter description x.x = output voltage = 3.3, 5.0, 12, adj the lm1501b series of regulators are m onolithic integrated circuits that pr ovide all the active functions for a step-down switching regulator, capabl e of driving a 5a load with excell ent line and load regulation. these devices are available in fixed output voltages of 3. 3v, 5v, 12v and an adjustable output version. requiring a minimum number of external components, these regulators are simple to use. the lm1501b series operates at a switching frequency of 300khz. available in standard 5-lead to-263 and to-220 packages. other features include a guaranteed 3% tolerance on output voltage under specified input voltage and output load conditions, and 15% on the oscillator frequency. exte rnal shutdown is included, featuring typically 80ua standby current. self protection features include a curr ent limit for output switch and an over temperature shutdown for complete protection under fault conditions . the over temperature shutdown level is about 145 with 5 hysteresis.
5.0a, 300khz, step-down switching regulator lm1501b mar. 2011 ? ver. 1.2 2 htc ordering information v out package order no. description package marking supplied as to-263 5l lm1501br-adj-5l 5a, 300khz lm1501b-adj reel adj to-220 5l lm1501bt-adj-5l 5a, 300khz lm1501b-adj tube to-263 5l lm1501br-3.3-5l 5a, 300khz lm1501b-3.3 reel 3.3v to-220 5l lm1501bt-3.3-5l 5a , 300khz lm1501b-3.3 tube to-263 5l lm1501br-5.0-5l 5a, 300khz lm1501b-5.0 reel 5.0v to-220 5l lm1501bt-5.0-5l 5a, 300khz lm1501b-5.0 tube to-263 5l lm1501br-12-5l 5a, 300khz lm1501b-12 reel 12v to-220 5l lm1501bt-12-5l 5a, 300khz lm1501b-12 tube pin configuration to-263 5l to-220 5l pin description to-263 / to-220 5 lead pin no. name function 1 v in operating input voltage 2 output switching output voltage 3 gnd ground 4 fb output voltage feedback control 5 sd on/off shutdown sd fb gnd output vin sd fb gnd output vin : to-263 : to-220 r t lead count : 5l output voltage : adj / 3.3v / 5.0v / 12v package type root name lm 1501b r ? 3.3 v ? 5 l product code
5.0a, 300khz, step-down switching regulator lm1501b mar. 2011 ? ver. 1.2 3 htc electrical characteristics unless otherwise specified, t j =25 v in = 12v for the 3.3v, 5v, and adjustable version and v in = 24v for the 12v version. i load = 500ma. characteristic symb ol test condition min typ max unit lm1501b -adj v out = 3v, i load = 5a 73 lm1501b-3.3 v in = 12v, i load = 5a 73 lm1501b-5 v in = 12v, i load = 5a 80 efficiency lm1501b-12 v in = 25v, i load = 5a 90 % lm1501b-3.3 4.75v v in 40v 0.2a i load 5a 3.20 3.3 3.40 lm1501b-5 7v v in 40v 0.2a i load 5a 4.85 5 5.15 output voltage v out lm1501b-12 15v v in 40v 0.2a i load 5a 11.64 12 12.36 v feedback voltage v fb lm1501b-adj 4.5v v in 40v 0.2a i load 5a v out programmed for 3v 1.180 1.215 1.250 oscillator frequency f o 255 300 345 khz feedback bias current i d lm1501b-adj; v fb =1.215v 15 50 na saturation voltage v sat i out = 5a, (note 2, 3) 1.4 v (note 3) 100 max duty cycle (on) max duty cycle (off) dc (note 4) 0 % current limit i cl peak current, (note 2, 3) 6.5 a output = 0v (note 2, 4) 50 a output leakage current i l output = -1v, v in =40v 2 30 ma quiescent current i q (note 4) 4.5 10 ma standby quiescent current i stby on/off pin = 5v(off), v in = 40v 80 200 a 1.3 v ih low (regulator on) 0.6 on/off pin logic input threshold voltage v il high (regulator off) 2.0 v i h v logic = 2.5v (regulator off) 5 15 on/off pin logic input current i l v logic = 0.5v (regulator on) 5 ua note 2. no elements connected to output pin note 3. feedback pin removed from output and connected to 0v to force the output transistor switch on. note 4. feedback pin removed from output and connected to 12v fo r the 3.3v, 5v, and the a version, and 15v for the 12v version. to force the output transistor switch off
5.0a, 300khz, step-down switching regulator lm1501b mar. 2011 ? ver. 1.2 4 htc typical application typical operating characteristics t. b . d application informaion t.b.d lm1501b-5.0
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