MICROCIRCUIT DATA SHEET Original Creation Date: 08/29/95 Last Update Date: 05/22/00 Last Major Revision Date: 08/29/95 MNLM1575-12-X REV 0D1 SIMPLE SWITCHER(TM) 1A STEP-DOWN VOLTAGE REGULATOR General Description The LM1575 regulator is a monolithic integrated circuit that provides all the active functions from a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. Requiring a minimum number of external components, this regulator is simple to use and includes internal frequency compensation and a fixed-frequency oscillator. The LM1575 offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is required. A standard series of inductors optimized for use with the LM1575 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 voltage and output load conditions, and +10% on the oscillator frequency. External shutdown is included, featuring 50uA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions. Industry Part Number NS Part Numbers LM1575-12 LM1575J-12-QML LM1575K-12-QML LM1575WG-12-QML Prime Die LM1575-12 Controlling Document SEE FEATURES SECTION Processing Subgrp Description 1 2 3 4 5 6 7 8A 8B 9 10 11 MIL-STD-883, Method 5004 Quality Conformance Inspection MIL-STD-883, Method 5005 1 Static tests at Static tests at Static tests at Dynamic tests at Dynamic tests at Dynamic tests at Functional tests at Functional tests at Functional tests at Switching tests at Switching tests at Switching tests at Temp ( oC) +25 +125 -55 +25 +125 -55 +25 +125 -55 +25 +125 -55 MICROCIRCUIT DATA SHEET MNLM1575-12-X REV 0D1 Features - Adjustable version output voltage range, 1.23V to 37V +4% max over line and load conditions - Guaranteed 1A output current - Requires only 4 external components - 52KHz fixed frequency internal oscillator - TTL shutdown capability, low power standby mode - High efficiency - Uses readily available standard inductors - Thermal shutdown and current limit protection CONTROLLING DOCUMENTS: LM1575J-12-QML 5962-9167301QEA LM1575K-12-QML 5962-9167301QXA LM1575WG-12-QML 5962-9167301QZA Applications - Simple high-efficiency step-down (buck) regulator Efficient pre-regulator for linear regulators On-card switching regulators Positive to negative converted (Buck-Boost) 2 MICROCIRCUIT DATA SHEET MNLM1575-12-X REV 0D1 (Absolute Maximum Ratings) (Note 1) Maximum Supply Voltage 45V ON/OFF Pin Input Voltage -0.3V <V< +Vin Output Voltage to Ground (Steady State) Power Dissipation (Note 2, 3) -1V Internally Limited Storage Temperature Range -65 C < Ta < +150 C Lead Temperature (Soldering, 10 seconds) METAL CAN CERDIP CERAMIC SOIC Maximum Junction Temperature 300 C 260 C 260 C 150 C Thermal Resistance ThetaJA METAL CAN (Still Air) (500LF/Min Air flow) CERDIP (Still Air) (500LF/Min Air flow) CERAMIC SOIC (Still Air) (500LF/Min Air flow) 45 10 70 33 121 73 ThetaJC (Note 3) METAL CAN CERDIP (Note 3 applicable to this Pkg only) CERAMIC SOIC Package Weight (Typical) METAL CAN CERDIP CERAMIC SOIC ESD Tolerance (Note 4) C/W C/W C/W C/W C/W C/W 3.3 C/W 2.0 C/W 3.0 C/W TBD TBD TBD 3000V Note 1: Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. The maximum power dissipation must be derated at elevated temperatures and is dictated by Tjmax (maximum junction temperature), ThetaJA (package junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is Pdmax = (Tjmax - TA)/ThetaJA or the number given in the Absolute Maximum Ratings, whichever is lower. 3 MICROCIRCUIT DATA SHEET MNLM1575-12-X REV 0D1 (Continued) Note 3: Note 4: The package material for these devices allows much improved heat transfer over our standard ceramic packages. In order to take full advantage of this improved heat transfer, heat sinking must be provided between the package base (directly beneath the die), and either metal traces on, or thermal vias through, the printed circuit board. Without this additional heat sinking, device power dissipation must be calculated using junction-to-ambient, rather than junction-to-case, thermal resistance. It must not be assumed that the device leads will provide substantial heat transfer out of the package, since the thermal resistance of the leadframe material is very poor, relative to the material of the package base. The stated junction-to-case thermal resistance is for the package material only, and does not account for the additional thermal resistance between the package base and the printed circuit board. The user must determine the value of the additional thermal resistance and must combine this with the stated value for the package, to calculate the total allowed power dissipation for the device. Human body model, 1.5k Ohms in series with 100pF. Recommended Operating Conditions Temperature Range -55 C < Ta < +125 C Supply Voltage 40V 4 MICROCIRCUIT DATA SHEET MNLM1575-12-X REV 0D1 Electrical Characteristics ELECTRICAL CHARACTERISTICS: SYSTEM PARAMETERS (The following conditions apply to all the following parameters, unless otherwise specified.) DC: Vin = 25V, and Iload = 200mA. SYMBOL Vout PARAMETER CONDITIONS NOTES Output Voltage 0.2A < Iload < 1A, 15V < Vin < 40V PINNAME UNIT SUBGROUPS MIN MAX 1 11.88 12.12 V 1 1 11.64 12.36 V 1 1 11.52 12.48 V 2, 3 ELECTRICAL CHARACTERISTICS: DEVICE PARAMETERS (The following conditions apply to all the following parameters, unless otherwise specified.) DC: Vin = 25V, and Iload = 200mA. Vsat Icl Il Iq Istby Saturation Voltage Current Limit Output Leakage Current Iout = 1A Peak Current, tON < 3uS 1.2 V 1 2 1.4 V 2, 3 2 1.7 3.0 A 1 2 1.3 3.2 A 2, 3 Vin = 35V, Output = 0V 4 2 mA 1 Vin = 35V, Output = -1V 4 30 mA 1 4 10 mA 1 4 12 mA 2, 3 200 uA 1 500 uA 2, 3 Quiescent Current Standby Quiescent Current 2 ON/OFF Pin = 5V (OFF) AC ELECTRICAL CHARACTERISTICS: DEVICE PARAMETERS (The following conditions apply to all the following parameters, unless otherwise specified.) AC: Vin = 25V, and Iload = 200mA. fo Dc Oscillator Frequency Max Duty Cycle (ON) 3 5 47 58 KHz 4 43 62 KHz 5, 6 % 9 93 MICROCIRCUIT DATA SHEET MNLM1575-12-X REV 0D1 Electrical Characteristics ELECTRICAL CHARACTERISTICS: ON/OFF CONTROL (The following conditions apply to all the following parameters, unless otherwise specified.) DC: Vin = 25V, and Iload = 200mA. SYMBOL PARAMETER CONDITIONS NOTES PINNAME MIN MAX UNIT SUBGROUPS Vih ON/OFF Pin Logic Input Level Vout = 0V 2.2 V 1 Vih ON/OFF Pin Logic Input Level Vout = 0V 2.4 V 2, 3 Vil ON/OFF Pin Logic Input Level Vout = 12V 1.0 V 1 Vil ON/OFF Pin Logic Input Level Vout = 12V 0.8 V 2, 3 Iih ON/OFF Pin Input Current ON/OFF Pin = 5V (OFF) 30 uA 1 Iil ON/OFF Pin Input Current ON/OFF Pin = 0V (ON) 10 uA 1 Note 1: Note 2: Note 3: Note 4: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. Output sourcing current. No diode, inductor or capacitor connected to output. Feedback removed from output and connected to 0V. Feedback removed from output and connected to 25V to force the output transistor OFF. 6 MICROCIRCUIT DATA SHEET MNLM1575-12-X REV 0D1 Graphics and Diagrams GRAPHICS# DESCRIPTION 06153HRA2 METAL CAN (KA), TO-3, 4LD, LOW PROFILE (B/I CKT) 06265HRB2 CERDIP (J), 16 LEAD (B/I CKT) 06379HRA1 CERAMIC SOIC (WG), 16 LEAD (B/I CKT) J16ARL CERDIP (J), 16 LEAD (P/P DWG) KA04BRA METAL CAN (KA), TO-3, 4 LEAD, LOW PROFILE(P/P DWG) P000232A METAL CAN (KA), TO-3, 4LD, LOW PROFILE (PINOUT) P000371A CERDIP (J), 16 LEAD (PINOUT) P000464A CERAMIC SOIC (WG), 16 LEAD (PIN OUT) WG16ARC CERAMIC SOIC (WG), 16 LEAD (P/P DWG) See attached graphics following this page. 7 +VIN OUTPUT CASE IS GROUND FEEDBACK ON/OFF LM1575K, LM1575HVK 4 - LEAD TO-3 CONNECTION DIAGRAM BOTTOM VIEW P000232A N MIL/AEROSPACE OPERATIONS 2900 SEMICONDUCTOR DRIVE SANTA CLARA, CA 95050 * 1 16 VIN * 2 15 * OUTPUT 3 14 GND * 4 13 GND GND 5 12 GND * 6 11 GND FB 7 10 * * 8 9 *No Internal Connection LM1575J 16 - LEAD DIP CONNECTION DIAGRAM TOP VIEW P000371A N MIL/AEROSPACE OPERATIONS 2900 SEMICONDUCTOR DRIVE SANTA CLARA, CA 95050 ON/OFF NC 1 16 INPUT NC 2 15 NC OUTPUT 3 14 N/C NC 4 13 N/C N/C 5 12 GND NC 6 11 NC FEEDBACK 7 10 NC GND 8 9 ON/OFF LM1575WG 16 - LEAD CERAMIC SOIC CONNECTION DIAGRAM TOP VIEW P000464A N MIL/AEROSPACE OPERATIONS 2900 SEMICONDUCTOR DRIVE SANTA CLARA, CA 95050 MICROCIRCUIT DATA SHEET MNLM1575-12-X REV 0D1 Revision History Rev ECN # Originator Changes 0C0 M0001549 05/22/00 Rel Date Barbara Lopez Changed: MNLM1575-X-12 Rev 0B0 to MNLM1575-12-X Rev. 0C0. Added power dissipation note for Aluminum Nitride package. Changed nomenclature. 0D1 M0003688 05/22/00 Rose Malone Update MDS: MNLM1575-12-X, Rev. 0C0 to MNLM1575-12-X, Rev. 0D1. Added reference to WG package to Main Table, Market Dwg., B/I Ckt., Pin Out to Graphics Section and to Absolute Maximum Ratings Section. Moved Controlling Documents (SMD numbers) to Features Section. Corrected typo in Recommended Operating Conditions Section. 8