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LM2576 Series
Description
The MIK2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output versions. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator. The MIK2576 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in some cases no heat sink is required. A standard series of inductors optimized for use with the MIK2576 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed 4% tolerance on output voltage within specified input voltages and output load conditions, and 10% on the oscillator frequency. External shutdown is included, featuring 50A (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions. Note: The MIK2576HV is not produced yet.
Features
* * * * * * * * * * * 3.3V, 5V, 12V, 15V, and adjustable output versions Adjustable version output voltage range 1.23V to 37V (57V for HV version) 4% max over line and load conditions Guaranteed 3A output current Wide input voltage range, 40V up to 60V for HV version Requires only 4 external components 52 kHz fixed frequency oscillator TTL shutdown capability, low power standby mode High efficiency Uses readily available standard inductors Thermal shutdown and current limit protection
Applications
* * * * Simple high-efficiency step-down (buck) regulator Efficient pre-regulator for linear regulators On-card switching regulators Positive to negative converter (Buck-Boost)
Typical application
Figure 1.(Fixed Output Voltage Versions)
7V - 40V (60V for HV) UNREGULATED DC INPUT
+VIN 1
MIK2576/ FEEDBACK MIK2576HV- 4 L1 OUTPUT 5.0
2 3 5 ON/OFF 100 H D1
+
GND CIN
+
1N5822
COUT 1000 F
+5V REGULATED OUTPUT 3A LOAD
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LM2576 Series
Block Diagram
VIN UNREGULATED DC INPUT CIN FEEDBACK 1 INTERNAL REGULATOR ON/OFF ON/OFF 5
+
4 R2 FIXED GAIN ERROR AMP
R1 1.0k
+ -
COMPARATOR
DRIVER
3 AMP SWITCH
+ 2
OUTPUT
L1
VOUT
+
3 1.23V 52kHZ BAND-GAP REFERENCE OSCILLATOR D1 COUT RESET THERMAL SHUTDOWN CURRENT LIMIT GND
L O A D
3.3V, R2 =1.7K 5V, R2 = 3.1K 12V, R2 = 8.84K 15V, R2 =11.3K For ADJ, Version R1 = Open, R2 =0
Ordering information
Temperature Range -40 TA C 125 C Output Voltage, V 3.3 5.0 12 15 ADJ 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
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LM2576 Series
Absolute Maximum Ratings (Note 1)
Parameter Maximum Supply Voltage MIK2576 MIK2576HV ON/OFF Pin Input Voltage Output Voltage to Ground (Steady State) Power Dissipation Storage Temperature Range Maximum Junction Temperature Minimum ESD Rating (C= 100pF, R = 1.5 k) Lead Temperature (Soldering, 10 Seconds) Maximum 45 63 -0.3V V +VIN -1 Internally Limited -65 to +150 150 2 260 Units V
V W C C kV C
Operating Ratings
Parameter Temperature Range MIK2576/ MIK2576HV Supply Voltage MIK2576 MIK2576HV Value -40 TJ +125 40 60 Units C V
Electrical Characteristics MIK2576-3.3, MIK2576HV-3.3
Specifications with standard type face are for T J = 25 and those with boldface type apply over full Operating Temperature Range. C, Symbol Parameter Conditions Typ SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2 VOUT Output Voltage VIN =12V, ILOAD =0.5A Circuit of Figure 2 6V VIN 40V, 0.5A ILOAD 3A Circuit of Figure 2 6V VIN 60V, 0.5A ILOAD 3A Circuit of Figure 2 VIN =12V, ILOAD =3A 3.3 3.234 3.366 3.3 3.168/3.135 3.432/3.465 3.3 3.168/3.135 3.450/3.482 75 V V(Min) V(Max) V V(Min) V(Max) V V(Min) V(Max) % MIK2576-3.3 MIK2576HV-3.3 Limit (Note 2) Units (Limits)
VOUT
Output Voltage MIK2576 Output Voltage MIK2576HV Efficiency
VOUT
Electrical Characteristics MIK2576-5.0, MIK2576HV-5.0
Specifications with standard type face are for T J = 25 and those with boldface type apply over full Operating Temperature Range. C, Symbol Parameter Conditions Typ SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2 VOUT Output Voltage VIN =12V, ILOAD =0.5A Circuit of Figure 2 0.5A ILOAD 3A, 8V VIN 40V Circuit of Figure 2 0.5A ILOAD 3A, 8V VIN 60V Circuit of Figure 2 VIN =12V, ILOAD =3A 5.0 4.900 5.100 5.0 4.800/4.750 5.200/5.250 5.0 4.800/4.750 5.225/5.275 77 V V(Min) V(Max) V V(Min) V(Max) V V(Min) V(Max) % MIK2576-5.0 MIK2576HV-5.0 Limit (Note 2) Units (Limits)
VOUT
Output Voltage MIK2576 Output Voltage MIK2576HV Efficiency
VOUT
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LM2576 Series
Electrical Characteristics MIK2576-12, MIK2576HV-12
Specifications with standard type face are for T J = 25 and those with boldface type apply over full Operating Temperature Range. C, Symbol Parameter Conditions MIK2576-12 MIK2576HV-12 Typ SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2 VOUT Output Voltage VIN =25V, ILOAD =0.5A Circuit of Figure 2 0.5A ILOAD 3A, 15V VIN 40V Circuit of Figure 2 0.5A ILOAD 3A, 15V VIN 60V Circuit of Figure 2 VIN =15V, ILOAD =3A 12 11.76 12.24 12 11.52/11.40 12.48/12.60 12 11.52/11.40 12.54/12.66 88 V V(Min) V(Max) V V(Min) V(Max) V V(Min) V(Max) % Limit(Note 2) Units (Limits)
VOUT
Output Voltage MIK2576 Output Voltage MIK2576HV Efficiency
VOUT
Electrical Characteristics MIK2576-15, MIK2576HV-15
Specifications with standard type face are for T J = 25 and those with boldface type apply over full Operating Temperature Range. C, Symbol Parameter Conditions MIK2576-15 MIK2576HV-15 Typ SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2 VOUT Output Voltage VIN =25, ILOAD =0.5A Circuit of Figure 2 0.5A ILOAD 3A, 18 VIN 40V Circuit of Figure 2 0.5A ILOAD 3A, 18 VIN 60V Circuit of Figure 2 VIN =18V, ILOAD =3A 15 14.70 15.30 15 14.40/14.25 15.60/15.75 15 14.40/14.25 15.68/15.83 88 V V(Min) V(Max) V V(Min) V(Max) V V(Min) V(Max) % Limit (Note 2) Units (Limits)
VOUT
Output Voltage MIK2576 Output Voltage MIK2576HV Efficiency
VOUT
Electrical Characteristics MIK2576-ADJ, MIK2576HV-ADJ
Specifications with standard type face are for T J = 25 and those with boldface type apply over full Operating Temperature Range. C, Symbol Parameter Conditions MIK2576-ADJ MIK2576HV-ADJ Typ SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2 VOUT Feedback Voltage VIN =12V, ILOAD =0.5A, VOUT =5V Circuit of Figure 2 0.5A ILOAD 3A , 8V VIN 40V VOUT =5V Circuit of Figure 2 0.5A ILOAD 3A, 8V VIN 60V, VOUT =5V Circuit of Figure 2 VIN =12V, ILOAD =3A, VOUT =5V 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 77 V V(Min) V(Max) V V(Min) V(Max) V V(Min) V(Max) % Limit(Note 2) Units (Limits)
VOUT
Feedback Voltage MIK2576 Feedback Voltage MIK2576HV Efficiency
VOUT
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LM2576 Series
All Output Voltage Versions Electrical Characteristics
Specifications with standard type face are for T J = 25 and those with boldface type apply over full Operating Temperature Range. C, Unless otherwise specified, V IN =12V for the 3.3V, 5V, and Adjustable version, V IN =25V for the 12V version, and V IN =30V for the 15V version, , ILOAD =500mA. Symbol Parameter Conditions MIK2576-XX MIK2576HV-XX Typ DEVICE PARAMETERS Ib fO Feedback Bias Current Oscillator Frequency VOUT =5V (Adjustable Version Only) (Note 8) 50 52 47/42 58/63 VSAT DC ICL Saturation Voltage Max Duty Cycle (ON) Current Limit IOUT =3A (Note 4) (Note 5) (Notes 4, 8) 1.4 1.8/2.0 98 93 5.8 4.2/3.5 6.9/7.5 IL Output Leakage Current Output = 0V IQ ISTBY Quiescent Current Standby Quiescent Current (Notes 6, 7): Output = -1V Output = -1V (Note 6) ___ ON/OFF Pin = 5V (OFF) 7.5 30 5 10 50 200 2 100/500 nA kHz kHz(Min) kHz(Max) V V(Max) % %(Min) A A(Min) A(Max) mA(Max) mA mA(Max) mA mA(Max) A A(Max) Limit (Note 2) Units (Limits)
___ ON/OFF CONTROL VIH __ ON/OFF Pin VIL Logic Input Level IIH __ ON/OFF Pin Input Current IIL
VOUT = 0V VOUT = Nominal Output Voltage __ ON/OFF Pin = 5V (OFF) __ ON/OFF Pin = 0V (ON)
1.4 1.2 12
2.2/2.4 1.0/0.8 30
V(Min) V(Max) A A(Max) A A(Max)
0 10
Note
Note Note Note Note Note Note Note
1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. 2: All limits guaranteed at room temperature (standa rd type face) and at temperature extremes (bold type face). 3: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the MIK2576/MIK2576HV is used as shown in the Figure 2 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. 4: Output pin sourcing current. No diode, inductor or capacitor connected to output. 5: Feedback pin removed from output and connected to 0V. 6: Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V, and 5V, versions, and +25V for the 12V and 15V versions, to force the output transistor OFF. 7: VIN =40V (60V for high voltage version). 8: The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protections feature lowers the average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%.
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LM2576 Series
Typical Performance Characteristics (Circuit of Figure 2)
Normalized Output Voltage
VIN =20V ILOAD = 500mA Normalized at TJ =25 C
Line Regulation
ILOAD = 500mA TJ =25 C 3.3V, 5V & ADJ 12V & 15V
Dropout Voltage
ILOAD = 3A
L1 = 150 H ILOAD = 1A ILOAD = 200mA RIND = 0.1
JUNCTION TEMPERATURE ( C)
INPUT VOLTAGE (V)
JUNCTION TEMPERATURE ( C)
Standby Quiescent Current
Quiescent Current
Current Limit
VIN = 25V VIN = 40V VOUT = 5V Measured at Ground Pin TJ =25 C ILOAD = 3A ILOAD = 200mA
VON/OFF = 5V VIN =12 V
JUNCTION TEMPERATURE ( C)
INPUT
VOLTAGE (V)
JUNCTION TEMPERATURE ( C)
Switch Saturation Voltage
Efficiency
Oscilator Frequency
Normalized at 25 C
ILOAD = 3A -55 C 25 C 150 C 15V OUT 5V ILOAD = 3A
TJ =25 C ILOAD = 200mA VIN = 40V
ILOAD = 200mA SWITCH CURRENT (A) INPUT VOLTAGE (V)
VIN = 12V
JUNCTION TEMPERATURE ( C)
Minimum Operating Voltage
Quiescent Current vs Duty Cycle
Adjustable Version Only
Feedback Voltage vs Duty Cycle
Adjustable Version Only
Adjustable Version Only
VIN = 7V VIN = 40V
VOUT 1.23V ILOAD = 500mA
ILOAD = 500mA VIN = 40V VIN = 7V
ILOAD = 500mA
JUNCTION TEMPERATURE ( C)
DUTY CYCLE (%)
DUTY CYCLE (%)
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LM2576 Series
Maximum Power Dissipation (TO-263) Feedback Pin Current
Adjustable Version Only
JA = 32 C/W A = 37 J C/W A = 50 J C/W A = 73 J C/W
AMBIENT TEMPERATURE ( C)
JUNCTION TEMPERATURE ( C)
Switching Waveforms Response
A
Load Transient
B
Output Voltage Change
C
Load Current
D 5 s/div 100 s/div
VOUT =15V A: Output Pin Voltage, 50V/div B: Output Pin Current, 2A/div C: Inductor Current, 2A/div D: Output Ripple Voltage, 50mV/div, AC-Coupled Horizontal Time Base: 5s/div
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LM2576 Series
Test Circuit and Layout Guidelines
As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance generate voltage transients which can cause problems. For minimal inductance and ground loops, the length of the leads indicated by heavy lines should be kept as short as possible. Single-point grounding (as indicated) or ground plane construction should be used for best results. When using the Adjustable version, physically locate the programming resistors near the regulator, to keep the sensitive feedback wiring short.
Fixed Output Voltage Versions
FEEDBACK +VIN 1 VIN UNREGULATED DC INPUT
(Figure 2a)
MIK2576HVFIXED OUTPUT
D 3 5
4 OUTPUT 2
L1 100 H D1 MBR360
VOUT L O A D
+
1 GN00 F
ON/OFF
+
COUT 1000 F
CIN -- 100F, 75V, Aluminum Electrolytic COUT -- 1000F, 25V, Aluminum Electrolytic D1 -- Schottky, MBR360 L1 -- 100H, Pulse Eng. PE-92108 R1 -- 2k, 0.1% R2 -- 6.12k, 0.1%
Adjustable Output Voltage Version
+VIN 1 7V -60V UNREGULATED DC INPUT
(Figure 2b)
VOUT 5.00V L O A D
MIK2576HVADJ
3 5
FEEDBACK 4 L1 OUTPUT 2 100 H MBR360 R2
+
100 CIN
F GND
ON/OFF
COUT
+
1000 F
R1
VOUT = R2
) R V R 1 ( OUT- ) VREF 1
VREF 1 + R (2
where VREF = 1.23V, R1 between 1k and 5k
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