MIK2576 series regulators monolithic integrated circuits that provide
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LM2576 Series
MIK2576 series regulators monolithic integrated circuits that provide active functions step-down (buck) switching regulator, capable driving load with excellent line load regulation. These devices available fixed output voltages 3.3V, 12V, 15V, adjustable output versions. Requiring minimum number external components, these regulators simple include internal frequency compensation fixed-frequency oscillator. MIK2576 series offers high-efficiency replacement popular three-terminal linear regulators. substantially reduces size heat sink, some cases heat sink required. standard series inductors optimized with MIK2576 available from several different manufacturers. This feature greatly simplifies design switch-mode power supplies. Other features include guaranteed tolerance output voltage within specified input voltages output load conditions, ±10% oscillator frequency. External shutdown included, featuring 50µA (typical) standby current. output switch includes cycle-by-cycle current limiting, well thermal shutdown full protection under fault conditions. Note: MIK2576HV produced yet.
3.3V, 12V, 15V, adjustable output versions Adjustable version output voltage range 1.23V (57V version) over line load conditions Guaranteed output current Wide input voltage range, version Requires only external components fixed frequency oscillator shutdown capability, power standby mode High efficiency Uses readily available standard inductors Thermal shutdown current limit protection
Applications
Simple high-efficiency step-down (buck) regulator Efficient pre-regulator linear regulators On-card switching regulators Positive negative converter (Buck-Boost)
Typical application
Figure 1.(Fixed Output Voltage Versions)
(60V UNREGULATED INPUT
+VIN
MIK2576/ FEEDBACK MIK2576HV- OUTPUT
ON/OFF
1N5822
COUT 1000
REGULATED OUTPUT LOAD
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2576 Series
Block Diagram
UNREGULATED INPUT FEEDBACK INTERNAL REGULATOR ON/OFF ON/OFF
FIXED GAIN ERROR
1.0k
COMPARATOR
DRIVER
SWITCH
OUTPUT
VOUT
1.23V 52kHZ BAND-GAP REFERENCE OSCILLATOR COUT RESET THERMAL SHUTDOWN CURRENT LIMIT
3.3V, =1.7K 3.1K 12V, 8.84K 15V, =11.3K ADJ, Version Open,
Ordering information
Temperature Range -40° 125° Output Voltage, TO-263 Package Type
MIK2576HVS-3.3 MIK2576HVS-5.0 MIK2576HVS-12 MIK2576HVS-15 MIK2576HVS-ADJ MIK2576S-3.3 MIK2576S-5.0 MIK2576S-12 MIK2576S-15 MIK2576S-ADJ
MIK2576HVT-3.3 MIK2576HVT-5.0 MIK2576HVT-12 MIK2576HVT-15 MIK2576HVTADJ MIK2576T-3.3 MIK2576T-5.0 MIK2576T-12 MIK2576T-15 MIK2576T-ADJ
TO-220
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2576 Series
Absolute Maximum Ratings (Note
Parameter Maximum Supply Voltage MIK2576 MIK2576HV ON/OFF Input Voltage Output Voltage Ground (Steady State) Power Dissipation Storage Temperature Range Maximum Junction Temperature Minimum Rating 100pF, Lead Temperature (Soldering, Seconds) Maximum -0.3V +VIN Internally Limited +150 Units
Operating Ratings
Parameter Temperature Range MIK2576/ MIK2576HV Supply Voltage MIK2576 MIK2576HV Value +125 Units
Electrical Characteristics MIK2576-3.3, MIK2576HV-3.3
Specifications with standard type face those with boldface type apply over full Operating Temperature Range. Symbol Parameter Conditions SYSTEM PARAMETERS (Note Test Circuit Figure VOUT Output Voltage =12V, ILOAD =0.5A Circuit Figure 40V, 0.5A ILOAD Circuit Figure 60V, 0.5A ILOAD Circuit Figure =12V, ILOAD 3.234 3.366 3.168/3.135 3.432/3.465 3.168/3.135 3.450/3.482 V(Min) V(Max) V(Min) V(Max) V(Min) V(Max) MIK2576-3.3 MIK2576HV-3.3 Limit (Note Units (Limits)
VOUT
Output Voltage MIK2576 Output Voltage MIK2576HV Efficiency
VOUT
Electrical Characteristics MIK2576-5.0, MIK2576HV-5.0
Specifications with standard type face those with boldface type apply over full Operating Temperature Range. Symbol Parameter Conditions SYSTEM PARAMETERS (Note Test Circuit Figure VOUT Output Voltage =12V, ILOAD =0.5A Circuit Figure 0.5A ILOAD Circuit Figure 0.5A ILOAD Circuit Figure =12V, ILOAD 4.900 5.100 4.800/4.750 5.200/5.250 4.800/4.750 5.225/5.275 V(Min) V(Max) V(Min) V(Max) V(Min) V(Max) MIK2576-5.0 MIK2576HV-5.0 Limit (Note Units (Limits)
VOUT
Output Voltage MIK2576 Output Voltage MIK2576HV Efficiency
VOUT
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2576 Series
Electrical Characteristics MIK2576-12, MIK2576HV-12
Specifications with standard type face those with boldface type apply over full Operating Temperature Range. Symbol Parameter Conditions MIK2576-12 MIK2576HV-12 SYSTEM PARAMETERS (Note Test Circuit Figure VOUT Output Voltage =25V, ILOAD =0.5A Circuit Figure 0.5A ILOAD Circuit Figure 0.5A ILOAD Circuit Figure =15V, ILOAD 11.76 12.24 11.52/11.40 12.48/12.60 11.52/11.40 12.54/12.66 V(Min) V(Max) V(Min) V(Max) V(Min) V(Max) Limit(Note Units (Limits)
VOUT
Output Voltage MIK2576 Output Voltage MIK2576HV Efficiency
VOUT
Electrical Characteristics MIK2576-15, MIK2576HV-15
Specifications with standard type face those with boldface type apply over full Operating Temperature Range. Symbol Parameter Conditions MIK2576-15 MIK2576HV-15 SYSTEM PARAMETERS (Note Test Circuit Figure VOUT Output Voltage =25, ILOAD =0.5A Circuit Figure 0.5A ILOAD Circuit Figure 0.5A ILOAD Circuit Figure =18V, ILOAD 14.70 15.30 14.40/14.25 15.60/15.75 14.40/14.25 15.68/15.83 V(Min) V(Max) V(Min) V(Max) V(Min) V(Max) Limit (Note Units (Limits)
VOUT
Output Voltage MIK2576 Output Voltage MIK2576HV Efficiency
VOUT
Electrical Characteristics MIK2576-ADJ, MIK2576HV-ADJ
Specifications with standard type face those with boldface type apply over full Operating Temperature Range. Symbol Parameter Conditions MIK2576-ADJ MIK2576HV-ADJ SYSTEM PARAMETERS (Note Test Circuit Figure VOUT Feedback Voltage =12V, ILOAD =0.5A, VOUT Circuit Figure 0.5A ILOAD VOUT Circuit Figure 0.5A ILOAD 60V, VOUT Circuit Figure =12V, ILOAD =3A, VOUT 1.230 1.217 1.243 1.230 1.193/1.180 1.267/1.280 1.230 1.193/1.180 1.273/1.286 V(Min) V(Max) V(Min) V(Max) V(Min) V(Max) Limit(Note Units (Limits)
VOUT
Feedback Voltage MIK2576 Feedback Voltage MIK2576HV Efficiency
VOUT
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2576 Series
Output Voltage Versions Electrical Characteristics
Specifications with standard type face those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, =12V 3.3V, Adjustable version, =25V version, =30V version, ILOAD =500mA. Symbol Parameter Conditions MIK2576-XX MIK2576HV-XX DEVICE PARAMETERS Feedback Bias Current Oscillator Frequency VOUT (Adjustable Version Only) (Note 47/42 58/63 VSAT Saturation Voltage Duty Cycle (ON) Current Limit IOUT (Note (Note (Notes 1.8/2.0 4.2/3.5 6.9/7.5 Output Leakage Current Output ISTBY Quiescent Current Standby Quiescent Current (Notes Output Output (Note ON/OFF (OFF) 100/500 kHz(Min) kHz(Max) V(Max) %(Min) A(Min) A(Max) mA(Max) mA(Max) mA(Max) µA(Max) Limit (Note Units (Limits)
ON/OFF CONTROL ON/OFF Logic Input Level ON/OFF Input Current
VOUT VOUT Nominal Output Voltage ON/OFF (OFF) ON/OFF (ON)
2.2/2.4 1.0/0.8
V(Min) V(Max) µA(Max) µA(Max)
Note
Note Note Note Note Note Note Note
Absolute Maximum Ratings 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 (standa type face) temperature extremes (bold type face). External components such catch diode, inductor, input output capacitors affect switching regulator system performance. When MIK2576/MIK2576HV used shown Figure test circuit, system performance will shown system parameters section Electrical Characteristics. Output sourcing current. diode, inductor capacitor connected output. Feedback removed from output connected Feedback removed from output connected +12V Adjustable, 3.3V, versions, +25V versions, force output transistor OFF. =40V (60V high voltage version). oscillator frequency reduces approximately event output short overload which causes regulated output voltage drop approximately from nominal output voltage. This self protections feature lowers average power dissipation lowering minimum duty cycle from down approximately
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2576 Series
Typical Performance Characteristics (Circuit Figure
Normalized Output Voltage
=20V 500mA Normalized =25°
Line Regulation
500mA =25° 3.3V,
Dropout Voltage
200mA RIND
JUNCTION TEMPERATURE
INPUT VOLTAGE
JUNCTION TEMPERATURE
Standby Quiescent Current
Quiescent Current
Current Limit
VOUT Measured Ground =25° ILOAD ILOAD 200mA
VON/OFF
JUNCTION TEMPERATURE
INPUT
VOLTAGE
JUNCTION TEMPERATURE
Switch Saturation Voltage
Efficiency
Oscilator Frequency
Normalized
-55° 150°
=25° 200mA
200mA SWITCH CURRENT INPUT VOLTAGE
JUNCTION TEMPERATURE
Minimum Operating Voltage
Quiescent Current Duty Cycle
Adjustable Version Only
Feedback Voltage Duty Cycle
Adjustable Version Only
Adjustable Version Only
VOUT 1.23V LOAD 500mA
LOAD 500mA
LOAD 500mA
JUNCTION TEMPERATURE
DUTY CYCLE
DUTY CYCLE
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2576 Series
Maximum Power Dissipation (TO-263) Feedback Current
Adjustable Version Only
AMBIENT TEMPERATURE
JUNCTION TEMPERATURE
Switching Waveforms Response
Load Transient
Output Voltage Change
Load Current
s/div s/div
VOUT =15V Output Voltage, 50V/div Output Current, 2A/div Inductor Current, 2A/div Output Ripple Voltage, 50mV/div, AC-Coupled Horizontal Time Base: 5µs/div
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2576 Series
Test Circuit Layout Guidelines
switching regulator, layout very important. Rapidly switching currents associated with wiring inductance generate voltage transients which cause problems. minimal inductance ground loops, length leads indicated heavy lines should kept short possible. Single-point grounding indicated) ground plane construction should used best results. When using Adjustable version, physically locate programming resistors near regulator, keep sensitive feedback wiring short.
Fixed Output Voltage Versions
FEEDBACK +VIN UNREGULATED INPUT
(Figure
MIK2576HVFIXED OUTPUT
OUTPUT
MBR360
VOUT
GN00
ON/OFF
COUT 1000
100µF, 75V, Aluminum Electrolytic COUT 1000µF, 25V, Aluminum Electrolytic Schottky, MBR360 100µH, Pulse Eng. PE-92108 0.1% 6.12k, 0.1%
Adjustable Output Voltage Version
+VIN -60V UNREGULATED INPUT
(Figure
VOUT 5.00V
MIK2576HVADJ
FEEDBACK OUTPUT MBR360
ON/OFF
COUT
1000
VOUT
OUT- VREF
VREF
where VREF 1.23V, between
Address
Postalcode:100039 Tel: 86-010-58895780 Http://www.estek.com.cn Email:sales@estek.com.cn
6A06-6A07 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing
010-58895793
No:01-060813
BEIJING ESTEK ELECTRONICS CO.,LTD
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