MILITARY DATA SHEET Original Creation Date: 08/29/95 Last Update Date: 09/29/95 Last Major Revision Date: 08/29/95 MNLM1575-X-12 REV 0B0 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 Prime Die LM1575-12 Controlling Document 5962-9167301QEA, QXA 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 MILITARY DATA SHEET MNLM1575-X-12 REV 0B0 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 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 MILITARY DATA SHEET MNLM1575-X-12 REV 0B0 (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 -1V Internally Limited Storage Temperature Range -65 C to +150 C Minimum ESD Rating (C = 100pF, R = 1.5K Ohms) Lead Temperature (Soldering, 10 Sec.) CERDIP TO3 Maximum Junction Temperature 3KV 260 C 300 C 150 C Thermal Resistance ThetaJA Metal Can (Still Air) Metal Can (500LF/Min Air flow) CERDIP (Still Air) CERDIP (500LF/Min Air flow) 45 10 70 33 ThetaJC Metal Can CERDIP Note 1: C/W C/W C/W C/W 3.3 C/W 2.0 C/W 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. Recommended Operating Conditions Temperature Range -55 C < TA < +125 C Supply Voltage 40V 3 MILITARY DATA SHEET MNLM1575-X-12 REV 0B0 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 PINNAME MAX 1 11.88 12.12 V 1 0.2A < Iload < 1A, 15V < Vin < 40V 1 11.64 12.36 V 1 0.2A < Iload < 1A, 15V < Vin < 40V 1 11.52 12.48 V 2, 3 Output Voltage UNIT SUBGROUPS MIN 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 1.2 V 1 2 1.4 V 2, 3 Peak Current, tON < 3uS 2 1.7 3.0 A 1 Peak Current, tON < 3uS 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 ON/OFF Pin = 5V (OFF) 200 uA 1 ON/OFF Pin = 5V (OFF) 500 uA 2, 3 Quiescent Current Standby Quiescent Current 2 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 4 47 58 KHz 4 43 62 KHz 5, 6 % 9 93 MILITARY DATA SHEET MNLM1575-X-12 REV 0B0 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 .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. 5 MILITARY DATA SHEET MNLM1575-X-12 REV 0B0 Graphics and Diagrams GRAPHICS# DESCRIPTION J16ARL CERDIP (J), 16 LEAD (P/P DWG) KA04BRA METAL CAN, TO-3, 4 LEAD, LOW PROFILE (P/P DWG) See attached graphics following this page. 6