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Silicon Link Inc. 1 March 2010 Rev. 1 www.silicon-link.com
SL2575 2A Step-down Voltage Switching Regulators
DESCRIPTION SL2575 of regulators provides all the active functions for a step-down (buck) switching regulator, and drives 2A load with excellent line and load regulation. SL2575 is available in fixed output voltages of 3.3V, 5V, 12V, 15V, and a versatile Adjustable output version. These regulators are simple to use and require a minimum number of external components. Features include internal frequency compensation and a fixes-frequency oscillator. The SL2575 is high-efficiency replacements for popular three-terminal linear regulators, and is requiring a smaller heatsink or even no heatsink. SL2575 performs well with standard inductors from several manufacturers, and simplifying the design of switch-mode power supplies. SL2575 guarantees ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included with 50µ A (typical) standby current. The output switch has cycle-by-cycle current limiting as well as thermal shutdown for full protection under fault conditions.
PIN CONFIGURATION – Top View ORDERING INFORMATION
SL2575 50 D8 13
FEATURES
3.3V, 5V, 12V, 15V, Adjustable output versions
Adjustable output version output voltage range 1.23V to 37V ±4% max over line and load conditions
2A output current
Input voltage range up to 40V
Requires only 4 external components
High efficiency
TTL shutdown capability, low power standby mode
Thermal shutdown, current limit protection
Uses standard inductors
52 kHz fixed frequency internal oscillator
APPLICATIONS
Pre-regulator for linear regulators
High-efficiency step-down buck regulator
On-card/ board switching regulators
Positive to negative converter (buck-boost)
1
2
3
4
8
7
6
5
8L SOIC
GND
GND
GND
GND On / Off
VIN
VOUT
Feedback
PACKAGE TOP MARKING:
Line 1: Device Line 2: Lot No. Code
F – Foundry Code (C) YMXXX – 5 Character Lot No. S – Split Code
Line 3: Voltage + Date Code VV – Voltage Output G – Assembly Vendor Code
Y – Last digit of the Year WW – Workweek
SL2575 FYMXXXS VVGYWW
Circuit Type: 2A Step-Down Voltage Switching Regulators
Voltage Output:
AD = Adj 33 = 3.3V 50 = 5.0V
12 = 12V 15 = 15V
Packaging Option: T = Tube
13 = Tape and Reel (13” Reel Dia)
Package Style: D8 = SOIC/8L
Silicon Link Inc. 2 March 2010 Rev. 1 www.silicon-link.com
SL2575 2A Step-down Voltage Switching Regulators
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS TYPICAL APPLICATIONS LOW NOISE APPLICATIONS
Silicon Link Inc. 3 March 2010 Rev. 1 www.silicon-link.com
SL2575 2A Step-down Voltage Switching Regulators
ABSOLUTE MAXIMUM RATINGS
Rating Value Unit
Maximum Supply Voltage 45 V
ON/OFF Pin Input Voltage
-0.3≤V≤VIN
V
Output Voltage to Ground (Steady State) -1.0 V
Power Dissipation Internally Limited -
Storage Temperature Range -65 to + 150 °C
Maximum Junction Temperature +150 C
Minimum ESD Rating (C=100pF, R=1.5k W) 2 kV
Lead Temperature (Soldering, 10 seconds) +260 C
OPERATING RATINGS
Rating Value Unit
Operating Temperature Range -40≤TJ≤ 125 °C
Supply Voltage 40 V
ELECTRICAL CHARACTERISTICS: SL2575-3.3 (Specifications with standard type face are for T
J = 25°C and those with boldface type apply over full Operating Temperature
Range)
Parameter Conditions Symbol Min Typ Max Unit
Output Voltage VIN = 12V, ILOAD = 0.5A VOUT 3.234 3.3 3.366 V
Output Voltage -SL2575 6V ≤ VIN
≤ 40V, 0.5A
≤ ILOAD
≤ 2.0A VOUT 3.168/ 3.135 3.3 3.432/ 3.465 V
Efficiency VIN = 12V, ILOAD = 2.0A η - 75 - %
ELECTRICAL CHARACTERISTICS: SL2575-5.0 (Specifications with standard type face are for TJJ
= 25°C and those with boldface type apply over full Operating Temperature
Range)
Parameter Conditions Symbol Min Typ Max Unit
Output Voltage VIN = 12V, ILOAD = 0.5A VOUT 4.900 5.0 5.100 V
Output Voltage -SL2575 8V ≤ VIN
≤ 40V, 0.5A
≤ ILOAD
≤ 2.0A VOUT 4.800/ 4.750 5.0 5.200/ 5.250 V
Efficiency VIN = 12V, ILOAD = 2.0A η - 77 - %
Silicon Link Inc. 4 March 2010 Rev. 1 www.silicon-link.com
SL2575 2A Step-down Voltage Switching Regulators
ELECTRICAL CHARACTERISTICS: SL2575-12 (Specifications with standard type face are for T
J = 25°C and those with boldface type apply over full Operating Temperature
Range)
Parameter Conditions Symbol Min Typ Max Unit
Output Voltage VIN = 25V, ILOAD = 0.5A VOUT 11.76 12.0 12.24 V
Output Voltage-SL2575 15V ≤ VIN
≤ 40V, 0.5A
≤ ILOAD
≤ 2.0A VOUT 11.52/ 11.40 12.0 12.48/ 12.60 V
Efficiency VIN = 15V, ILOAD = 2.0A η - 88 - %
ELECTRICAL CHARACTERISTICS: SL2575-15 (Specifications with standard type face are for T
J =25°C and those with boldface type apply over full Operating Temperature
Range)
Parameter Conditions Symbol Min Typ Max Unit
Output Voltage VIN = 25V, ILOAD = 0.5A VOUT 14.70 15.0 15.30 V
Output Voltage-SL2575 18V ≤ VIN
≤ 40V, 0.5A
≤ ILOAD
≤ 2.0A VOUT 14.40/14.25 15.0 15.60/ 15.75 V
Efficiency VIN = 18V, ILOAD = 2.0A η - 88 - %
ELECTRICAL CHARACTERISTICS: SL2575-ADJ (Specifications with standard type face are for T
J =25°C and those with boldface type apply over full Operating Temperature
Range)
Parameter Conditions Symbol Min Typ Max Unit
Feedback Voltage VIN = 12V, ILOAD = 0.5A, VOUT = 5V VOUT 1.217 1.230 1.243 V
Feedback Voltage-SL2575
8V ≤ VIN
≤ 40V, 0.5A
≤ ILOAD
≤ 2.0A
VOUT = 5V VOUT 1.193/1.180 1.230 1.267/1.280 V
Efficiency VIN = 12V, ILOAD = 2.0A, VOUT = 5V η - 77 - %
Silicon Link Inc. 5 March 2010 Rev. 1 www.silicon-link.com
SL2575 2A Step-down Voltage Switching Regulators
ELECTRICAL CHARATERISTICS (Specifications with standard type face are for T
J = 25 °C and those with boldface type apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5.0V and ADJ version, VIN = 25V for 12V version and VIN
= 30V for
15V version. ILOAD = 500 mA)
Parameter Conditions Symbol Min Typ Max Unit
Feedback Bias Current VOUT = 5V (Adjustable Version Only) Ib - 50 100 / 500 nA
Oscillator Frequency (Note 8) fO 47 / 42 52 58 / 63 kHz
Saturation Voltage IOUT = 3A (Note 4) VSAT - 1.4 1.8 / 2.0 V
Max Duty Cycle (ON) (Note 5) DC 93 98 - %
Current Limit (Note 4, 8) ICL 4.2 / 3.5 5.8 6.9 / 7.5 A
Output Leakage Current (Notes 6, 7) Output = -1 V Output = -1 V
IL - -
- 7.5
2 30
mA
Quiescent Current (Note 6) IQ - 5 10 mA
Standby Quiescent Current
ON/OFF Pin = 5V (OFF)
ISTBY - 50 200 µA
ON/OFF Pin
VOUT = 0V VIH 2.2 / 2.4 1.4 - V
Logic Input Level VOUT = Nominal Output Voltage VIL - 1.2 1.0 / 0.8 V
ON/OFF Pin Input Current
ON/OFF Pin = 5V (OFF)
IIH - 12 30 µA
ON/OFF Pin = 0V (ON)
IIL - 0 10 µA
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. Guaranteed specifications and Test conditions are shown in Electrical Characteristics.
Note 2: All limits guaranteed at 25°C (standard type face) and over full operating temperature range (bold type face). All 25°C limits are 100% production tested. All limits over full operating temperature range are guaranteed via correlation using standard Statistica Quality Control methods.
Note 3: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the SL2575 is used as shown in the Figure 1 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics.
Note 4: Output pin sourcing current. No diode, inductor or capacitor connected to output.
Note 5: Feedback pin removed from output and connected to 0V.
Note 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.
Note 7: VIN
= 40V
Note 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-protection feature lowers the Average power dissipation of SL2575 by lowering the minimum duty cycle from 5% down to approximately 2%.
Silicon Link Inc. 6 March 2010 Rev. 1 www.silicon-link.com
SL2575 2A Step-down Voltage Switching Regulators
TEST CIRCUIT AND LAYOUT GUIDELINES
Careful layout is important with any switching regulator. Rapidly switching currents associated with wiring inductance generate
voltage transients which can cause problems. To minimize inductance and ground loops, the lengths of the leads indicated by
heavy lines in Figure 1 below should be kept as short as possible. Single-point grounding (as indicated in Figure 1) or ground
plane construction should be used for best results. When using the Adjustable version, place the programming resistors as
close as possible to SL2575, to keep the sensitive feedback wiring short.
Figure 1(a). Fixed Output Voltage Versions
Figure 1(b). Adjustable Output Voltage Versions
CIN - 100µF, 75V, Aluminum Electrolytic COUT - 680µF, 25V, Aluminum Electrolytic D1 – Schottky, MBR360 L1 - 100µH, 3L Electronic Corp. TC-101M-3.0A-6826 R1 – 2k, 0.1% R2 – 6.12k, 0.1%
Silicon Link Inc. 7 March 2010 Rev. 1 www.silicon-link.com
SL2575 2A Step-down Voltage Switching Regulators
TYPICAL PERFORMANCE CHARACTERISTICS
SWITCH CURRENT (A)
Figure 2. Switch Saturation Voltage
JUNCTION TEMPERATURE (°C)
Figure 3. Current Limit
JUNCTION TEMPERATURE (°C)
Figure 4. Dropout Voltage
INPUT VOLTAGE (V)
Figure 5. Quiescent Current
JUNCTION TEMPERATURE (°C)
Figure 6. Standby Quiescent Current
JUNCTION TEMPERATURE (°C)
Figure 7. Minimum Operating Voltage
Silicon Link Inc. 8 March 2010 Rev. 1 www.silicon-link.com
SL2575 2A Step-down Voltage Switching Regulators
TYPICAL PERFORMANCE CHARACTERISTICS
DUTY CYCLE (%)
Figure 8. Quiescent Current vs. Duty Cycle
DUTY CYCLE (%)
Figure 9. Feedback Voltage vs. Duty Cycle
AMBIENT TEMPERATURE (°C)
Figure 10. Maximum Power Dissipation JUNCTION TEMPERATURE (°C)
Figure 11. Feedback Pin Current
Figure 12. Switching Waveforms Figure 13. Load Transient Response
Silicon Link Inc. 9 March 2010 Rev. 1 www.silicon-link.com
SL2575 2A Step-down Voltage Switching Regulators
PROCEDURE (Adjustable Output Voltage Versions) Given: VOUT = Regulated Output Voltage
VIN(Max) = Maximum Input Voltage ILOAD(Max) = Maximum Load Current F = Switching Frequency (Fixed at 52 kHz)
1. Programming Output Voltage (Selecting R1 and R2,
as shown in Figure 12. and Figure 13.
Use the following formula to select the appropriate resistor values. R2 R1
R1 can be between 1k and 5k. (For best temperature coefficient and stability with time, use 1% metal film resistors) VOUT
VREF EXAMPLE (Adjustable Output Voltage Versions) Given:
VOUT = 10V VIN(Max) = 25V
VOUT 1,000 ILOAD(Max) = 2A VIN F(in kHz) F = 52kHz
1. Programming Output Voltage (Selecting R1 and R2) R2 R1
VOUT 10V VREF 1.23V
R2 = 1k (8.13 - 1) = 7.13k, closest 1% value is 7.15k
Figure 14. SL2575-3.3 Figure 15. SL2575-12 Figure 16. SL2575-5.0
Figure 17. SL2575-ADJ
E T = (VIN – VOUT)
VOUT = VREF ( 1+ ) where VREF = 1.23V
R2 = R1 ( -1)
VOUT = 1.23 (1+ ) Select R1 = 1k
R2 = R1 ( -1) = 1k ( -1)
Silicon Link Inc. 10 March 2010 Rev. 1 www.silicon-link.com
SL2575 2A Step-down Voltage Switching Regulators
LOW NOISE PERFORMANCE CHARACTERISTICS
Silicon Link Inc. 11 March 2010 Rev. 1 www.silicon-link.com
SL2575 2A Step-down Voltage Switching Regulators
8L-SOIC PACKAGE DIMENSION
DIMENSION IN
INCHES DIMENSION IN MM
SYM MIN NOM MAX MIN NOM MAX
A 0.059 0.062 0.065 1.50 1.57 1.65
A1 0.004 0.008 0.010 0.10 0.20 0.25
A2 0.051 0.054 0.057 1.30 1.37 1.45
b 0.013 0.016 0.020 0.33 0.41 0.51
c 0.007 0.008 0.010 0.18 0.20 0.25
D 0.191 0.193 0.195 4.85 4.90 4.95
E1 0.151 0.153 0.155 3.84 3.89 3.94
E 0.228 0.234 0.240 5.79 5.94 6.10
e 0.050 1.27
L 0.020 0.024 0.032 0.51 0.61 0.81
L1 0.039 0.041 0.043 0.99 1.04 1.09
Ø 0* - B* 0* - B*
h 0.011 0.015 0.019 0.28 0.38 0.48
8-Lead SOIC Plastic Surface Mounted Package
SLI Package Code: D8
NOTES: 1. DIMENSION D DOES NOT INCLUDE MOLD FLASH,
PROTRUSIONS OR GATE BURRS. DIMENSION E1 DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
2. COPLANARITY APPLIES TO THE TERMINALS.
COPLANARITY SHALL NOT EXCEED 0.003” [0.08 mm].
3. BASED FROM JEDEC NS-012 VARIATION AA.
Silicon Link Inc. 12 March 2010 Rev. 1 www.silicon-link.com
SL2575 2A Step-down Voltage Switching Regulators
PACKAGE MECHANICAL DRAWING
Surface Mountable Tape & Reel Specifications in mm (inch) (SOIC)
- - - - - - - - - - - - - - - - - - - - User direction of feed
Tape Size (W)
D E P0 T (Max) A0, B0, K0 T1
(Max) Constant
Dimensions 8, 12, 16, 24mm
1.55±0.05 (.061±.002)
1.75±0.10 (.069±.004)
4.0±0.10 (.157±.004)
0.400 (.016)
See Note 0.100 (.004)
Tape
Size (W) B1
Max. D1
Min. F
K Max.
P2
8 mm 4.2
(.165) 1.0
(.039) 3.5±0.05
(.138±.002) 2.4
(.094) 2.0±.05
12 mm 8.2
(.323) 1.5
(.059) 5.5±0.05
(.217±.002) 4.5
(.177) .079±.002
Variable Dimensions
Per Package Requirement
Components Tape Width
(W) mm Cavity Pitch
(P) mm
Devices per Reel
7” Reel 13” Reel
SOIC 8L 12 8 - 2500
Note: Ao Bo Ko are determined by component size. The clearance between the component and the cavity must be within 0.05 [.002] min. to 0.50 [.020] max. for 8mm tape, 0.05 [.002] min to 0.65 [.026] max for 12mm tape.
Silicon Link Inc. 13 March 2010 Rev. 1 www.silicon-link.com
SL2575 2A Step-down Voltage Switching Regulators
REEL DIMENSIONS
Tape Size A
Max. B
Min. C
D* Min.
N Min.
G T
Max.
8mm 330
(12.992) 1.5
(.059) 13.0±0.20
(.152±.008) 20.2
(.795) 50
(1.973)
8.4±1.5 0.0
(.331±.059) 0.0
14.4 (.567)
12mm 330
(12.992) 1.5
(.059) 13.0±0.20
(.152±.008) 20.2
(.795) 50
(1.973)
12.4±2.0 0.0
(.488±.078) 0.0
14.4 (.567)
MECHANICAL POLARIZATION
SOIC-8L DEVICE
User direction of feed - - - - - - - - - - - - - - - - - - - -