52kHz Simple Buck Regulator LM2575 series monolithic integrated c

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52kHz Simple Buck Regulator LM2575 series monolithic integrated c

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LM2575
52kHz Simple Buck Regulator
LM2575 series monolithic integrated circuits provide active functions step-down (buck) switching regulator. Fixed versions available with 3.3V, 12V, fixed output. Adjustable versions have output voltage range from 1.23V 37V. Both versions capable driving load with excellent line load regulation. These regulators simple because they require minimum number external components include internal frequency compensation fixed-frequency oscillator. LM2575 series offers high efficiency replacement popular three-terminal adjustable linear regulators. substantially reduces size heat sink, many cases heat sink required. standard series inductors available from several different manufacturers ideal with LM2575 series. This feature greatly simplifies design switchmode power supplies. feedback voltage guaranteed tolerance adjustable versions, output voltage guaranteed fixed versions, within specified input voltages output load conditions. oscillator frequency guaranteed ±10%. External shutdown included, featuring less than 200µA standby current. output switch includes cycle-by-cycle current limiting thermal shutdown full protection under fault conditions. Data sheets support documentation found Micrel's site www.micrel.com.
Features
3.3V, 12V, adjustable output versions Voltage over specified line load conditions: Fixed version: max. output voltage Adjustable version: max. feedback voltage Guaranteed output current Wide input voltage range Wide output voltage range 1.23V Requires only external components 52kHz fixed frequency internal oscillator power standby mode typically <200µA efficiency (adjustable version typically >80%) Uses readily available standard inductors Thermal shutdown current limit protection 100% electrical thermal limit burn-in
Applications
Simple high-efficiency step-down (buck) regulator Efficient pre-regulator linear regulators On-card switching regulators Positive negative converter (inverting Buck-Boost) Isolated flyback converter using minimum number external components Negative boost converter
Typical Applications
7V-40V Unregulated Input Feedback +5V, Regulated Output COUT 330µF
7V-40V Unregulated Input LM2575 Feedback +5V, Regulated Output COUT 330µF 3.09k
+VIN 100µF
LM2575-5.0 Output 330µH On/Off 1N5822
+VIN 100µF
Output 330µH 1N5822
On/Off
Note: numbers TO-220 Package
Note: numbers TO-220 Package VOUT 1.23
Fixed Regulation Typical Application
Adjustable Regulation Fixed Output Application
Micrel Inc. 2180 Fortune Drive Jose, 95131 (408) 944-0800 (408) 474-1000 http://www.micrel.com
January 2007
M9999-010207
Micrel, Inc.
LM2575
Ordering Information
Part Number Standard LM2575BN* LM2575-3.3BN LM2575-5.0BN LM2575-12BN LM2575BWM* LM2575-3.3BWM LM2575-5.0BWM LM2575-12BWM LM2575BT* LM2575-3.3BT LM2575-5.0BT LM2575BU* LM2575-3.3BU LM2575-5.0BU LM2575-12BU
Notes:
Pb-Free RoHS Compliant Contact Factory Contact Factory LM2575-5.0YN Contact Factory LM2575YWM* LM2575-3.3YWM LM2575-5.0YWM LM2575-12YWM LM2575WT*/**
Temperature Range -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C -40° +85°C
Package 16-Pin Plastic 16-Pin Plastic 16-Pin Plastic 16-Pin Plastic 24-Pin Wide SOIC 24-Pin Wide SOIC 24-Pin Wide SOIC 24-Pin Wide SOIC 5-Pin TO-220 5-Pin TO-220 5-Pin TO-220 5-Pin TO-220 5-Pin TO-263 5-Pin TO-263 5-Pin TO-263 5-Pin TO-263
LM2575-3.3WT** LM2575-5.0WT** LM2575-12WT** LM2575WU*/** LM2575-3.3WU** LM2575-5.0WU** LM2575-12WU**
LM2575-12BT
Adjustable output regulators. RoHS compliant with "high-melting solder" exemption. Contact factory bent staggered leads option.
January 2007
M9999-010207
Micrel, Inc.
LM2575
Configuration
ON/OFF
5-Pin TO-220
5-Pin TO-263
ON/OFF
24-Pin Wide SOIC (WM)
ON/OFF
ON/OFF
16-Pin Plastic
January 2007
M9999-010207
Micrel, Inc.
LM2575
Absolute Maximum Ratings(1)
Maximum Supply Voltage (VIN) .45V ON/OFF Input Voltage. .-0.3V +40V Output Voltage Ground (Steady State) .-1V Power Dissipation .Internally Limited Maximum Junction Temperature. 150°C Lead Temperature (soldering, sec.). 260°C Storage Temperature (Ts) .-65°C +150°C Minimum Rating 100pF, 1.5k.
Operating Ratings
Supply Voltage (VIN).40V Junction Temperature Range (TJ).-40°C +125°C
Electrical Characteristics
Specifications with standard typeface 25°C, those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, 12V, ILOAD 200mA.
LM2575 Limit (Note Units (Limits) V(min) V(max) V(min) V(max) V(min) V(max) V(min) V(max) V(min) V(max) V(min) V(max) V(min) V(max) V(min) V(max)
Symbol Parameter Condition SYSTEM PARAMETERS, ADJUSTABLE REGULATORS (Note Test Circuit Figure Feedback Voltage VOUT ILOAD 0.2A VOUT 0.2A ILOAD VOUT
1.230
1.217 1.243 1.230 1.193/1.180 1.267/1.280 3.234 3.366 3.168/3.135 3.432/3.465 4.900 5.100 4.800/4.750 5.200/5.250 11.760 12.240 11.520/11.400 12.480/12.600
Feedback Voltage LM2575
Efficiency 12V, ILOAD VOUT SYSTEM PARAMETERS, 3.3V REGULATORS (Note Test Circuit Figure Output Voltage VOUT ILOAD 0.2A VOUT 3.3V 0.2A ILOAD VOUT 3.3V
Output Voltage LM2575-3.3
Efficiency 12V, ILOAD SYSTEM PARAMETERS, REGULATORS (Note Test Circuit Figure Output Voltage VOUT ILOAD 0.2A VOUT 0.2A ILOAD VOUT
Output Voltage LM2575-5.0
Efficiency 12V, ILOAD SYSTEM PARAMETERS, REGULATORS (Note Test Circuit Figure Output Voltage VOUT ILOAD 0.2A VOUT 0.2A ILOAD VOUT 25V, ILOAD
Output Voltage LM2575-12
Efficiency
January 2007
M9999-010207
Micrel, Inc.
LM2575 Limit (Note 100/500
LM2575
Symbol Parameter Condition DEVICE PARAMETERS, ADJUSTABLE REGULATOR Feedback Bias Current VOUT DEVICE PARAMETERS, FIXED ADJUSTABLE REGULATORS Oscillator Frequency
Units (Limits) kHz(min) kHz(max) V(max) %(max) A(min) A(max) mA(max) mA(max) mA(max) µA(max) °C/W
47/42 58/63 Saturation Voltage Duty Cycle (ON) Current Limit IOUT (Note (Note Peak Current, (Note 1.2/1.4 1.7/1.3 3.0/3.2 Standby Quiescent Current ON/OFF (OFF) /OFF (ON) 0.01 2.2/2.4 1.0/0.8
VSAT
Output Leakage Current
40V, (Note (Note (Note
Output Output Output
ISTBY
Quiescent Current
Package, Junction Ambient (Note Thermal Resistance Package, Junction Ambient (Note Package, Junction Case Package, Junction Ambient (Note Package, Junction Ambient (Note ON/OFF CONTROL, FIXED ADJUSTABLE REGULATORS Test Circuit Figure
Notes:
ON/OFF Logic Input Level ON/OFF Logic Current
VOUT VOUT /OFF (OFF)
V(min) V(max) µA(max) µA(max)
Absolute Maximum Rating indicate limits beyond which damage device occur. Operating Ratings indicate conditions which device intended functional, guarantee specific performance limits. guaranteed specifications test conditions, Electrical Characteristics. limits guaranteed room temperature (standard type face) temperature extremes (bold type face). room temperature limits are100% production tested. limits temperature extreme guaranteed testing. External components such catch diode, inductor, input output capacitors affect switching regulator system performance. When LM2575/LM1575 used shown Figure test circuit, system performance will shown system parameters section Electrical Characteristics. Output (pin sourcing current. diode, inductor capacitor connected output. Feedback (pin removed from output connected Feedback (pin removed from output connected force output transistor OFF. Junction ambient thermal resistance external heat sink) 5-pin TO-220 package mounted vertically, with 1/2" leads socket, board with minimum copper area. Junction ambient thermal resistance external heat sink) 5-pin TO-220 package mounted vertically, with 1/4" leads soldered board containing approximately square inches copper area surrounding leads. Junction ambient thermal resistance with approximately square inch board copper surrounding leads. Additional copper will lower thermal resistance further.
January 2007
M9999-010207
Micrel, Inc.
LM2575
Test Circuits Layout Guidelines
FEEDBACK +VIN UNREGULATED INPUT 100µF 330µH MBR360 VOUT 5.00V 470µF 100µF, Aluminum Electrolytic 470µF, Aluminum Electrolytic Schottky, MBR360 330µH, 415-0926 (AIE) 0.01% 3.065k, 0.01% 5-pin TO-220 socket-2936 (Loranger Mfg. Co.) 4-pin TO-3 socket-8112-AG7 (Augat Inc.)
LM2575
ON/OFF
FEEDBACK +VIN UNREGULATED INPUT 100µF
LM2575-5.0
ON/OFF
330µH MBR360 VOUT 5.00V 220µF 100µF, Aluminum Electrolytic 330µF, Aluminum Electrolytic Schottky, MBR360 330µH, 415-0926 (AIE) 5-pin TO-220 socket 2936 (Loranger Mfg. Co.) 4-pin TO-3 socket 8112-AG7 (Augat Inc.)
numbers TO-220 Package
Figure
switching regulator, layout very important. Rapidly switching currents associated with wiring inductance generate voltage transient switch cause problems. minimal stray inductance ground
loops, length leads indicated heavy lines should kept short possible. Single-point grounding indicated) ground plane construction should used best results.
January 2007
M9999-010207
Micrel, Inc.
LM2575
Typical Characteristics (circuit Figure
Supply Current
CURRE
Supply Current Duty Cycle
20.0
Standby Quiescent Current
Measured Ground VOUT
17.5 15.0 12.5 10.0 from
VON/OFF= VIN=
125150
INPUT VOLTAGE
Current Limit
Switch Saturation Voltage
SATU LTAG
Efficiency
VOUT
EFFI ENCY
VOUT
100125
INPUT VOLTAGE
FEED LTAG
INPUT VOLTAGE
1.23V OAD= 100125150
Normalized VOUT 500mA
Minimum Operating Voltage
Line Regulation
Feedback Current
-100 125150
INPUT TAGE
INPUT- OUTPUT DIFFERENTIAL
UTPUT LTAG CHANG
Normalized Output Voltage
FREQ UENCY
Oscillator Frequency
Normalized
Dropout Voltage
VOUT RIND
200mA Normalized
-100
100125150
100125150
100125150
January 2007
M9999-010207
Micrel, Inc.
LM2575
Typical Characteristics (continued)
FEED LTAG
Normalized Feedback Voltage*
200mA Normalized
Feedback Voltage Duty Cycle*
100125150
Adjustable version only
January 2007
M9999-010207
Micrel, Inc.
LM2575
Functional Characteristics (circuit Figure
Load Transient Response
Switching Waveforms
Output Voltage Change
+100mV -100mV
1.0A Output Current 0.5A 100µs/div.
Output voltage 10V/div Output current 1A/div Inductor current 0.5A/div Output ripple voltage mV/div. coupled Horizontal Time Base: 5µs/div
Functional Diagrams
3.1k FIXED GAIN ERROR
INTERNAL REGULATOR
ON/OFF
ON/OFF
1.0k
COMPARATOR
SWITCH DRIVER
THERMAL SHUTDOWN CURRENT LIMIT
1.23V BAND-GAP REFERENCE
OSCILLATOR
RESET
Note: numbers TO-220 package
Fixed Regulator
FIXED GAIN ERROR
INTERNAL REGULATOR
ON/OFF
ON/OFF
COMPARATOR
SWITCH DRIVER
THERMAL SHUTDOWN CURRENT LIMIT
1.23V BAND-GAP REFERENCE
OSCILLATOR
RESET
Adjustable Regulator
January 2007
M9999-010207
Micrel, Inc.
LM2575
Package Information
0.780 (19.812) .250±0.005 (6.350±0.127) 0.030-0.110 (0.762-2.794)
0.025±0.015 (0.635±0.381) 0.130±0.005 (3.302±0.127) 0.040 (1.016)
0.020 (0.508)
0.290-0.320 (7.336-8.128)
0-10 0.020 (0.508) 0.100±0.010 (2.540±0.254) 0.125 (3.175) 0.009-0.015 (0.229-0.381) 0.018±0.003 (0.457±0.076) +0.025 -0.015 +0.635 8.255 -0.381 0.325
16-Pin Plastic
24-Pin Wide SOIC (WM)
January 2007
M9999-010207
Micrel, Inc.
LM2575
5-Pin TO-220
5-Pin TO-263
January 2007
M9999-010207
Micrel, Inc.
LM2575
MICREL, INC. 2180 FORTUNE DRIVE JOSE, 95131
(408) 944-0800 (408) 474-1000 http://www.micrel.com
information furnished Micrel this data sheet believed accurate reliable. However, responsibility assumed Micrel use. Micrel reserves right change circuitry specifications time without notification customer. Micrel Products designed authorized components life support appliances, devices systems where malfunction product reasonably expected result personal injury. Life support devices systems devices systems that intended surgical implant into body support sustain life, whose failure perform reasonably expected result significant injury user. Purchaser's sale Micrel Products life support appliances, devices systems Purchaser's risk Purchaser agrees fully indemnify Micrel damages resulting from such sale. 2000 Micrel, Incorporated.
January 2007
M9999-010207

52kHz Simple Buck Regulator LM2575 series monolithic integrated c

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