SG1526/SG2526/SG3526 REGULATING PULSE WIDTH MODULATOR DESCRIPTION FEATURES 8 to 35 volt operation The SG1526 is a high performance monolithic pulse width modulator 5V reference trimmed to 1% circuit designed for fixed-frequency switching regulators and other 1Hz to 350KHz oscillator range power control applications. Included in an 18-pin dual-in-line package are a temperature compensated voltage reference, sawtooth oscillator, Dual 100mA source/sink outputs error amplifier, pulse width modulator, pulse metering and steering logic, Digital current limiting Double pulse suppression and two low impedance power drivers. Also included are protective Programmable deadtime features such as soft-start and undervoltage lockout, digital current Undervoltage lockout limiting, double pulse inhibit, a data latch for single pulse metering, adjustable deadtime, and provision for symmetry correction inputs. For Single pulse metering ease of interface, all digital control ports are TTL and B-series CMOS Programmable soft-start compatible. Active LOW logic design allows wired-OR connections for Wide current limit common mode range TTL/CMOS compatible logic ports maximum flexibility. This versatile device can be used to implement Symmetry correction capability single-ended or push-pull switching regulators of either polarity, both transformerless and transformer coupled. The SG1526 is characterized Guaranteed 6 unit synchronization for operation over the full military ambient junction temperature range of -55C to +150C. The SG2526 is characterized for operation from -25C HIGH RELIABILITY FEATURES - SG1526 to +150C, and the SG3526 is characterized for operation from 0C to +125C. Available to MIL-STD-883B and DESC SMD Radiation data available LMI levelprocessing available BLOCK DIAGRAM V REF +V C Reference Undervoltage +V IN Regulator Lockout GROUND SYNC To Internal R D Circuitry R T Oscillator OUTPUT A C T RESET Soft Start C S Q SOFTSTART T COMPENSATION +V R Q Q IN S MEMORY TOGGLE Q + ERROR F/F F/F Amp D Q ERROR OUTPUT B METERING F/F + C.S. C.S. SHUTDOWN Rev 1.1a 3.19.2005 Microsemi Inc. Copyright 1994 11861 Western Avenue Garden Grove, CA 92841 1 (714) 898-8121 FAX: (714) 893-2570 SG1526/SG2526/SG3526 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Voltage (V ) ............................................................... 40V Logic Sink Current ............................................................15mA IN Collector Supply Voltage (V ) ............................................. 40V Operating Junction Temperature C Logic Inputs ......................................................... -0.3V to 5.5V Hermetic (J, L Packages) ............................................ 150C Analog Inputs .......................................................... -0.3V to V Plastic (N, DW Packages) ........................................... 150C IN 200mA Source/Sink Load Current (each output) ....................... Storage Temperature Range ............................ -65C to 150C 50mA Reference Load Current .................................................. Lead Temperature (Soldering, 10 Seconds) ................... 300C RoHS Peak Package Solder Reflow Temp. (40 sec. max. exp.)...... 260C (+0, -5) Note 1. Exceeding these ratings could cause damage to the device. THERMAL DATA J Package: Thermal Resistance-Junction to Case, .................. 25C/W Note A. Junction Temperature Calculation: T = T + (P x ). J A D JA JC Note B. The above numbers for are maximums for the limiting Thermal Resistance-Junction to Ambient, .............. 70C/W JC JA thermal resistance of the package in a standard mount- N Package: Junction to Case, .................. 30C/W ing configuration. The numbers are meant to be Thermal Resistance- JC JA Thermal Resistance-Junction to Ambient, ............. 60C/W guidelines for the thermal performance of the device/pc- JA DW Package: board system. All of the above assume no ambient airflow. Thermal Resistance-Junction to Case, .................. 35C/W JC Thermal Resistance-Junction to Ambient, ............. 90C/W JA L Package: Junction to Case, ................... 35C/W Thermal Resistance- JC Thermal Resistance-Junction to Ambient, ........... 120C/W JA RECOMMENDED OPERATING CONDITIONS (Note 2) Input Voltage ............................................................. 8V to 35V Oscillator Timing Capacitor .................................... 1nF to 20F Collector Supply Voltage ........................................ 4.5V to 35V Available Deadtime Range at 40KHz ...................... 3% to 50% Sink/Source Load Current (each output) ................ 0 to 100mA Operating Ambient Temperature Range: Reference Load Current ........................................... 0 to 20mA SG1526 ......................................................... -55C to 125C Oscillator Frequency Range ..............................1Hz to 350KHz SG2526 ........................................................... -25C to 85C Oscillator Timing Resistor .................................. 2K to 150K SG3526 ............................................................... 0C to 70C Note 2. Range over which the device is functional. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1526 with -55C T 125C, SG2526 with A 85C, SG3526 with 0C T 70C, and V = 15V. Low duty cycle pulse testing techniques are used which maintains junction and case -25C T A A IN temperatures equal to the ambient temperature.) SG1526/2526 SG3526 Parameter Test Conditions Units Min. Typ. Max. Min. Typ. Max. Reference Section (Note 3) Output Voltage T = 25C 4.95 5.00 5.05 4.90 5.00 5.10 V J Line Regulation V = 8 to 35V 10 30 10 30 mV IN Load Regulation I = 0 to 20mA 10 30 10 50 mV L Temperature Stability (Note 9) Over Operating T 15 50 15 50 mV J Total Output Voltage Range (Note 9) Over Recommended Operating Conditions 4.90 5.00 5.10 4.85 5.00 5.15 V Short Circuit Current = 0V V 50 125 50 125 mA REF Undervoltage Lockout Section V = 3.8V V RESET Output Voltage 0.2 0.4 0.2 0.4 REF RESET Output Voltage V = 4.8V 2.4 4.8 2.4 4.8 V REF Rev 1.1a Copyright 1994 11861 Western Avenue Garden Grove, CA 92841 2 (714) 898-8121 FAX: (714) 893-2570