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S5ULM2596
Simple Switcher Power Converter
Elektronische Bauelemente
150KHz 3A Step-Down Voltage Regulator
Description
The S5ULM2596 series of regulators are monolithic integrated circuits that provide all 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 voltage of 3.3V,5V,12V and an adjustable output version.Requiring a min. rumber of external components, these regulators are simple to use and include internal frequency components and a fixedfrequency oscillator. The S5ULM2596 series operates at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching requlators. Available in a standard 5-lead TO-263 package with several different lead bend options. A standard series if inductors are available from several differnet manufactures optimized for use with the S5ULM2596 series.The feature greatly simplifies the design of switching-mode power supplies. Other feature include a guaranteed 4% to tolerance on output voltage within specified input voltages and output load condition, and 15% on the oscillator frequency. External shutdown is included, featuring 80uA(Typ.) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault condition.
REF. A b L4 c L1 E
Features
* High Efficiency
Min. 4.40 0.66 0.00 0.36 2.29 9.80
Millimeter
REF. Max. 4.80 c2 0.91 L2 0.30 B D 0.5 e 2.79 L 10.4
Min. Max. 1.25 1.45 1.27 REF. 8.6 9.0 1.70 REF. 14.6 15.8 0 8
Millimeter
* Input Voltage Range Up To 40V * 150KHz Fixed Frequency Oscillator * 3.3V,5V,12V and Adjustable Output Versions * Uses Readily Available Standard Inductors * TTL Shutdown Capability, Low Power Standby Mode
* Thermal Shutdown And Current Limit Protection
* Guaranteed 3A Output Current * Efficient Per-regulator For Linear Regulators * Requires Only 4 Extermal Components * Adjustable Version Output Voltage Range, 1.2V to 37V 4% Max. Over Line And Load Conditions
Applications
* Positive To Negative Converter
* Simple High-Effciency Step-Down (Buck) Regulator *
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01-Jun-2002 Rev. A
Page 1 of 8
S5ULM2596
Elektronische Bauelemente
Simple Switcher Power Converter 150KHz 3A Step-Down Voltage Regulator
Typical Application (Fixed Output Voltage Version)
GND
12V Unregulated DC Input DC Input
Description
Typically a large storage capacitor is connected from this pin to ground to insure that the input S5ULM2596-5.0 1.3V
33 NC
or open= output enable.
680
tage does not sag below the minimum dropout voltage during the load 1N5824 V higher than220 in order for the device to Vout
680
Block Diagram
FEEDBACK
Pin Function
Pin Name +VIN Output Ground Feedback ON/OFF PIN#
1 2 3 4 This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching current needed by regulator. Internal switch. The voltage at this pin switches between (+VIN - VSAT) and approximately -0.5V, with a duty cycle of approximately VOUT/VIN. To minimize coupling to sensitive circuit, the PC board copper area connected to this pin should be keep to a minimum. Circuit ground Senses the regulated output voltage to complete the feedback loop Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 80 uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of 25V) shuts the regulator down. If this shutdown feature is not needed, ON/OFF pin can be wired to the ground pin or it can be left open, in either case the regulator will be in the ON condition.
FUNCTION
5
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01-Jun-2002 Rev. A
Page 2 of 8
S5ULM2596
Elektronische Bauelemente
Simple Switcher Power Converter 150KHz 3A Step-Down Voltage Regulator
Absolute Maximum Ratings (Note1)
Parameter Maximum Supply Voltage ON/OFF pin input Voltage Feedback pin Voltage Output Voltage to ground (steady state) Power dissipation Storage Temperature Maximum junction temperature Minimum ESD rating (C=100pF, R=1.5k ) Lead temperature (soldering, 10seconds)
Ratings 45 -0.3 V +25 -0.3 V +25 -1 Internally Limited -65 ~ +150 +150 2k +260 Ratings -40 TJ +125 4.5 ~ 40
Unit V V V V : : V : Unit : V
Operating Ratings
Temperature range Supply Voltage
Parameter
S5ULM2596-3.3 Electrical Characteristics
Specifications with standard type face are for TJ=25 : , and those with boldface type apply over full operating temperature range
Parameter
Symbol
Conditions
System Parameters (Note5) Test Circuit Figure 2 4.75V VIN 40V Output Voltage VOUT 0.2A ILOAD 3A Efficiency VIN=12V, ILOAD=3A
(Note4)
Min
(Note3)
Typ
(Note4)
Max
Unit V %
3.168/3.135
3.3 73
3.432/3.465
S5ULM2596-5.0 Electrical Characteristics
Specifications with standard type face are for TJ=25 : , and those with boldface type apply over full operating temperature range
Parameter
Symbol
Conditions
System Parameters (Note5) Test Circuit Figure 2 7V VIN 40V Output Voltage VOUT 0.2A ILOAD 3A Efficiency VIN=12V, ILOAD=3A
(Note4)
Min
(Note3)
Typ
(Note4)
Max
Unit V %
4.80/4.75
5.0 80
5.20/5.25
S5ULM2596-12 Electrical Characteristics
Specifications with standard type face are for TJ=25 : , and those with boldface type apply over full operating temperature range
Parameter
Symbol
Conditions
System Parameters (Note5) Test Circuit Figure 2 15V VIN 40V Output Voltage VOUT 0.2A ILOAD 3A Efficiency VIN=15V, ILOAD=3A
(Note4)
Min
(Note3)
Typ
(Note4)
Max
Unit V %
11.52/11.40
12 90
12.48/12.60
S5ULM2596 Electrical Characteristics
Specifications with standard type face are for TJ=25 : , and those with boldface type apply over full operating temperature range
Parameter
Symbol
Conditions
System Parameters (Note5) Test Circuit Figure 2 4.5 VIN 40V, 0.2A ILOAD 3A Output Voltage VOUT VOUT=3V, Circuit of Figure 2 Efficiency VIN=12V, ILOAD=3A, VOUT=3V
(Note4)
Min
(Note3)
Typ
(Note4)
Max
Unit V %
1.193/1.180
1.230 77
1.267/1.280
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01-Jun-2002 Rev. A
Page 3 of 8
S5ULM2596
Elektronische Bauelemente
Simple Switcher Power Converter 150KHz 3A Step-Down Voltage Regulator
All Output Voltage Version Electrical Characteristics
Specifications with standard type face are for TJ=25 : , and those with boldface type apply over full operating temperature range. Unless otherwise specified, VIN=12V for the 3.3V, 5.0V and Adjustable versions, VIN=24V for 12V version. ILOAD=0.5A
Parameter Feedback bias current Oscillator frequency Saturation voltage
Maximum duty cycle (ON)
(OFF)
Symbol
Conditions VFB=1.3V (adjustable version only)
(Note 6)
(Note4)
Min
(Note3)
Typ 10
(Note4)
Max
Unit nA kHz V % A uA mA mA uA :/W
Ib
fO VSAT DC
127/110 3.6/3.4 -
50/00 173/173 1.4/1.5 6.9/7.5 50 30 10 200/250 0.6 15 5
ILOAD=3A (Note 7, 8)
(Note 8) (Note 9)
150 1.16 100 0 4.5 2 5 80 2 50 1.3 5 0.02
Current limit Output leakage current Quiescent current Standby quiescent current Thermal Resistance
ICL IL IQ
Peak Current (Note 7, 8) Output=0V(Note 7, 9) Output=-1V (Note 10)
(Note 9)
ISTBY ON/OFF pin=5V (OFF)(Note 10)
JC JA
Junction to Case Junction to Ambient (Note 11)
ON/OFF Control Test Circuit Figure 2 ON/OFF pin logic input Threshold Voltage ON/OFF pin input current VIH VIL Low (Regulator ON) High (Regulator OFF) VLOGIC=2.5V ( Regulator OFF) VLOGIC=0.5V ( Regulator ON) V
2.0 -
IH IL
uA
Note 1: Absolute Maximum Rating indicate limits beyond which damage to the device may occur. Operating Rating indicate conditions for which the device is intended to be functional, but do not guaranteed specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: The human body mode is a 100pF capacitor discharged through a 1.5k Note 3: Typical number are at 25 : and represent the most likely norm. resistor into each pin.
Note 4: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) method. All limits are used to calculate Average Outgoing Quality Level (AOQL). Note 5: External component such as the catch diode, inductor, input and output capacitors, and voltage programming resistor can affect switching regulator system performance. When the G5ELM2596 is used as shutdown in the Figure 1 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. Note 6: The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the severity of current over-load. Note 7: No diode, inductor or capacitor connected to output pin. Note 8: Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Note 9: Feedback pin removed from output and connected to 12V for the Adjustable, 3.3V and 5V versions, and 15V for the 12V version, to force the output transistor switch OFF. Note 10: VIN=40V. Note 11: Junction to ambient thermal resistance (no external heat sink) for To-220 package mounted vertically, with the leads soldered to a printed circuit board with (1 oz.) copper area of approximately 1 in .
2
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01-Jun-2002 Rev. A
Page 4 of 8
S5ULM2596
Elektronische Bauelemente
Simple Switcher Power Converter 150KHz 3A Step-Down Voltage Regulator
Typical Performance Characteristics (circuit of Figure 2)
Normalized Output Voltage
Line Regulator
Efficiency
Switch Saturation Voltage
Switch Current Limit
Dropout Voltage
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01-Jun-2002 Rev. A
Page 5 of 8
S5ULM2596
Elektronische Bauelemente
Simple Switcher Power Converter 150KHz 3A Step-Down Voltage Regulator
GND
Description
Typically a large storage capacitor is connected from this pin to ground to insure that the input 1.3V or open= output enable.
NC
tage does not sag below the minimum dropout voltage during the load V higher than Vout in order for the device to
Operating Quiescent Current
Shutdown Quiescent Current
Minimum Operating Supply Voltage
ON/OFF Threshold Voltage
ON/OFF Pin Current (Sinking)
Switching Frequency
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01-Jun-2002 Rev. A
Page 6 of 8
S5ULM2596
Elektronische Bauelemente
Simple Switcher Power Converter 150KHz 3A Step-Down Voltage Regulator
Feedback Pin Bi
as Current
/div Horizontal Time Base: 2 s
Continuous Mode Switching Waveforms
Discontinuous Mode Switching Waveforms
/div Horizontal Time Base: Horizontal Time Base: 100 s /div
Horizontal Time Base: 2 s
Load Transient Response for Continuous Mode
Horizontal Time Base: 200 s /div
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Load Transient Response for Discontinuous Mode
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01-Jun-2002 Rev. A
Page 7 of 8
S5ULM2596
Elektronische Bauelemente
Simple Switcher Power Converter 150KHz 3A Step-Down Voltage Regulator
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 wires indicated by heavy lines should be wide printed circuit traces and should be kept as short as possible. For best results, external components should be located as close to the switcher IC as possible using ground plane construction or single point grounding. If open core inductors are used, special care must be taken as to the location and positioning of this type of inductor. Allowing the inductor flux to intersect sensitive feedback, IC groundpath and COUT wiring can cause problems. When using the Adjustable version, special care must be taken as to the location of the feedback resistors and the associated wiring. Physically locate both resistors near the IC, and route the wiring away from the inductor, especially an open core type of inductor.
S5ELM2596
Cin-- 470uF, 50V, Aluminum Electrolytic Cout-- 220uF, 25V Aluminum Electrolytic D1-- 5A, 40V Schottky Rectifer, 1N5825 L1-- 68uH
S5ELM2596
Vout=VREF*(1+R2/R1) Where VREF=1.23V R2=R1*(Vout/VREF-1) Select R1 to be approximately 1k , use a 1% resistor for best stability. Cin-- 470uF, 50V, Aluminum Electrolytic Cout-- 220uF, 35V Aluminum Electrolytic D1-- 5A, 40V Schottky Rectifer, 1N5825 L1-- 68uH Figure 2 Standard
Test Circuits and Layout Guides
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01-Jun-2002 Rev. A
Page 8 of 8

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