Original Creation Date: 08/29/95
Last Update Date: 09/29/95
Last Major Revision Date: 08/29/95
MNLM1575HV-X-ADJ REV 0B0
MILITARY DATA SHEET
SIMPLE SWITCHER(TM) 1A STEP-DOWN HIGH VOLTAGE REGULATOR
General Description
The LM1575HV regulator is a monolithic integrated circuit that provides all the active functions for a step-down (buck) switching regulator, capable of driving 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 LM1575HV 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 LM1575HV 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 50uA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.
NS Part Numbers
LM1575HVKAD-QML
Industry Part Number
LM1575HV-ADJ
Prime Die
LM1575-ADJ
Controlling Document
5962-9167102QXA
Processing
MIL-STD-883, Method 5004
Quality Conformance Inspection
MIL-STD-883, Method 5005
Subgrp Description Temp ( C)o 1
Static tests at +252Static tests at +1253Static tests at -554Dynamic tests at +255Dynamic tests at +1256Dynamic tests at -557Functional tests at +258A Functional tests at +1258B Functional tests at -559Switching tests at +2510Switching tests at +12511
Switching tests at
-55
MILITARY DATA SHEET MNLM1575HV-X-ADJ REV 0B0
Features
- Adjustable version output voltage range, +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)
MILITARY DATA SHEET MNLM1575HV-X-ADJ REV 0B0
(Absolute Maximum Ratings)
(Note 1)
Maximum Supply Voltage
63V
ON/OFF Pin Input Voltage
-0.3V Output Voltage to Ground (Steady State) -1V Power Dissipation Internally Limited Storage Temperature Range -65 C to +150 C Minimum ESD Rating (C = 100pF, R = 1.5K Ohms) 2KV Lead Temperature (Soldering, 10 Sec.) 300 C Maximum Junction Temperature 150 C Thermal Resistance ThetaJA Metal Can (Still Air) 45 C/W 10 C/W Metal Can (500LF/Min Air flow) ThetaJC Metal Can 3.3 C/W 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. Recommended Operating Conditions Temperature Range -55 C < TA < +125 C Supply Voltage 60V MNLM1575HV-X-ADJ REV 0B0MILITARY DATA SHEET Electrical Characteristics ELECTRICAL CHARACTERISTICS: SYSTEM PARAMETERS (The following conditions apply to all the following parameters, unless otherwise specified.) DC:Vin = 12V, and Iload = 200mA. SYMBOL PARAMETER CONDITIONS NOTES PIN- NAME MIN MAX UNIT SUB-GROUPS Vfb Feedback Voltage Vout = Vfb1 1.217 1.243V1 Vfbt Feedback Voltage0.2A < Iload < 1A, 8V < Vin < 60V, Vout = Vfb 1 1.205 1.261V1 0.2A < Iload < 1A, 8V < Vin < 60V, Vout = Vfb 1 1.193 1.273V2, 3 ELECTRICAL CHARACTERISTICS: DEVICE PARAMETERS (The following conditions apply to all the following parameters, unless otherwise specified.) DC:Vin = 12V, and Iload = 200mA. Ib Feedback Bias Current Vout = Vfb100nA1 500nA2, 3 Vsat Saturation Voltage Iout = 1A2 1.2V1 2 1.4V2, 3 Icl Current Limit Peak Current, tON < 3uS2 1.7 3.0A1 Peak Current, tON < 3uS2 1.3 3.2A2, 3 Il Output Leakage Current Vin = 35V, Output = 0V42mA1 Vin = 35V, Output = -1V430mA1 Iq Quiescent Current410mA1 412mA2, 3 Istby Standby Quiescent Current ON/OFF Pin = 5V (OFF)200uA1 ON/OFF Pin = 5V (OFF)500uA2, 3 AC ELECTRICAL CHARACTERISTICS: DEVICE PARAMETERS (The following conditions apply to all the following parameters, unless otherwise specified.) AC:Vin = 12V, and Iload = 200mA. fo Oscillator Frequency 4758KHz4 4362KHz5, 6 Dc Max Duty Cycle (ON) 393%9 MNLM1575HV-X-ADJ REV 0B0MILITARY DATA SHEET Electrical Characteristics ELECTRICAL CHARACTERISTICS: ON/OFF CONTROL (The following conditions apply to all the following parameters, unless otherwise specified.) DC:Vin = 12V, and Iload = 200mA. SYMBOL PARAMETER CONDITIONS NOTES PIN- NAME MIN MAX UNIT SUB-GROUPS Vih ON/OFF Pin Logic Input Level Vout = 0V 2.2V1 Vih ON/OFF Pin Logic Input Level Vout = 0V 2.4V2, 3 Vil ON/OFF Pin Logic Input Level Vout = 5V 1.0V1 Vil ON/OFF Pin Logic Input Level Vout = 5V.8V2, 3 Iih ON/OFF Pin Input Current ON/OFF Pin = 5V (OFF)30uA1 Iil ON/OFF Pin Input Current ON/OFF Pin = 0V (ON)10uA1 Note 1:External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. Note 2:Output sourcing current. No diode, inductor or capacitor connected to output. Note 3:Feedback removed from output and connected to 0V. Note 4:Feedback removed from output and connected to 12V to force the output transistor OFF. MILITARY DATA SHEET MNLM1575HV-X-ADJ REV 0B0 Graphics and Diagrams GRAPHICS#DESCRIPTION KA04BRA METAL CAN, TO-3, 4 LEAD, LOW PROFILE (P/P DWG) See attached graphics following this page.