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SG1524/SG2524/SG3524
REGULATING PULSE WIDTH MODULATOR
DESCRIPTION
This monolithic integrated circuit contains all the control circuitry for a
regulating power supply inverter or switching regulator. Included in a 16-
pin dual-in-line package is the voltage reference, error amplifier, oscillator,
pulse width modulator, pulse steering flip-flop, dual alternating output
switches and current limiting and shut-down circuitry. This device can be
used for switching regulators of either polarity, transformer coupled DC to
DC converters, transformerless voltage doublers and polarity converters,
as well as other power applications. The SG1524 is specified for operation
over the full military ambient temperature range of -55°C to +125°C, the
SG2524 for -25°C to +85°C, and the SG3524 is designed for commercial
applications of 0°C to +70°C.
FEATURES
8V to 40V operation
5V reference
Reference line and load regulation of 0.4%
Reference temperature coefficient < ± 1%
100Hz to 300KHz oscillator range
Excellent external sync capability
Dual 50mA output transistors
Current limit circuitry
Complete PWM power control circuitry
Single ended or push-pull outputs
Total supply current less than 10mA
HIGH RELIABILITY FEATURES - SG1524
Available to MIL-STD-883B and DESC SMD
MIL-M-38510/12601BEA - JAN1524J
Radiation data available
LMI level "S" processing available
BLOCK DIAGRAM
4/90 Rev 1.1 2/94
Copyright © 1994
LINFINITY Microelectronics Inc.
1 11861 Western Avenue Garden Grove, CA 92841
(714) 898-8121 FAX: (714) 893-2570

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SG1524/SG2524/SG3524
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage (+VIN) ............................................................. 42V
Collector Voltage ................................................................ 40V
Logic Inputs ........................................................... -0.3V to 5.5V
Current Limit Sense Inputs ................................... -0.3V to 0.3V
Output Current (each transistor) .................................... 100mA
Reference Load Current .................................................. 50mA
Note 1. Values beyond which damage may occur.
THERMAL DATA
J Package:
Thermal Resistance-Junction to Case, θJC .................. 30°C/W
Thermal Resistance-Junction to Ambient, θJA .............. 80°C/W
N Package:
Thermal Resistance-Junction to Case, θJC .................. 40°C/W
Thermal Resistance-Junction to Ambient, θJA ............. 65°C/W
D Package:
Thermal Resistance-Junction to Case, θJC ................... 50°C/W
Thermal Resistance-Junction to Ambient, θJA ............ 120°C/W
L Package:
Thermal Resistance-Junction to Case, θJC .................. 35°C/W
Thermal Resistance-Junction to Ambient, θJA ........... 120°C/W
Oscillator Charging Current ................................................ 5mA
Operating Junction Temperature
Hermetic (J, L Packages) ............................................. 150°C
Plastic (N, D Packages) ............................................... 150°C
Storage Temperature Range ............................. -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) .................... 300°C
Note A.
Junction Temperature Calculation:
T
J
=
T
A
+
(P
D
x
θJA).
Note B. The above numbers for θJC are maximums for the limiting
thermal resistance of the package in a standard mount-
ing configuration. The θJA numbers are meant to be
guidelines for the thermal performance of the device/pc-
board system. All of the above assume no ambient
airflow.
RECOMMENDED OPERATING CONDITIONS (Note 2)
Input Voltage (+VIN) ................................................... 8V to 40V
Collector Voltage ....................................................... 0V to 40V
Error Amp Common Mode Range ..........................1.8V to 3.4V
Current Limit Sense Common Mode Range ........ -0.3V to 0.3V
Output Current (each transistor) ............................... 0 to 50mA
Reference Load Current ........................................... 0 to 20mA
Oscillator Charging Current .................................. 30µA to 2mA
Oscillator Frequency Range ......................... 100Hz to 300KHz
Oscillator Timing Resistor (RT) ........................ 1.8Kto 100K
Oscillator
Timing
Capacitor
(C )
T
............................
1nF
to
1.0µF
Operating Ambient Temperature Range
SG1524 ......................................................... -55°C to 125°C
SG2524 ........................................................... -25°C to 85°C
SG3524 ............................................................... 0°C to 70°C
Note 2: Range over which the device is functional and parameter limits are guaranteed.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1524 with -55°C TA 125°C, SG2524 with
-25°C
T
A
85°C,
SG3524
with
0°C
T
A
70°C,
and
+V
IN
=
20V.
Low duty cycle pulse testing techniques are used which maintains junction and
case temperatures equal to the ambient temperature.)
Parameter
Test Conditions
Reference Section (Note 3)
Output Voltage
Line Regulation
Load Regulation
Temperature Stability (Note 7)
TJ = 25°C
VIN = 8V to 40V
I = 0 to 20mA
L
Over Operating Temperature Range
Total Output Voltage Range (Note 7) Over Line, Load and Temperature
Short Circuit Current
V = 0V
REF
Note 3. IL = 0mA
SG1524/2524
SG3524
Min. Typ. Max. Min. Typ. Max.
Units
4.80 5.00 5.20 4.60 5.00 5.40
20 30
50 50
50 50
4.80 5.20 4.60 5.40
25 50 150 25 50 150
V
mV
mV
mV
V
mA
4/90 Rev 1.1 2/94
Copyright © 1994
LINFINITY Microelectronics Inc.
2 11861 Western Avenue Garden Grove, CA 92841
(714) 898-8121 FAX: (714) 893-2570

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SG1524/SG2524/SG3524
ELECTRICAL CHARACTERISTICS (continued)
Parameter
Oscillator Section (Note 4)
Initial Accuracy
Voltage Stability
Maximum Frequency
Sawtooth Peak Voltage
Sawtooth Valley Voltage
Clock Amplitude
Clock Pulse Width
Test Conditions
TJ = 25°C
MIN TJ MAX
V = 8V to 40V
IN
RT = 2K, CT = 1nF
VIN = 40V
V = 8V
IN
SG1524/2524
SG3524
Min. Typ. Max. Min. Typ. Max.
Units
36 40 44 36 40 44
34 46 34 46
0.1 1
0.1 1
200 400
200 400
3 3.8 3 3.8
0.6 1 1.2 0.6 1 1.2
3.2 3.2
0.3 1.5 0.3 1.5
KHz
KHz
%
KHz
V
V
V
µs
Error Amplifier Section (Note 5)
Input Offset Voltage
Input Bias Current
RS 2K
Input Offset Current
DC Open Loop Gain
Output Low Level
Output High Level
Common Mode Rejection
Supply Voltage Rejection
Gain-Bandwidth Product (Note 7)
P.W.M. Comparator (Note 4)
RL 10MΩ, TJ = 25°C
VPIN 1 - VPIN 2 150mV
VPIN 2 - VPIN 1 150mV
VCM = 1.8V to 3.4V
VIN = 8V to 40V
TJ = 25°C
Minimum Duty Cycle
Maximum Duty Cycle
VCOMP = 0.5V
VCOMP = 3.6V
Current Limit Amplifier Section (Note 6)
Sense Voltage
Input Bias Current
TJ = 25°C
Shutdown Section
Threshold Voltage
T
J
=
25°C
MIN TJ MAX
Output Section (each transistor)
Collector Leakage Current
Collector Saturation Voltage
Emitter Output Voltage
Collector Voltage Rise Time
Collector Voltage Fall Time
Power Consumption
VCE = 40V
IC = 50mA
IE = 50mA
RC = 2K
RC = 2K
Standby Current
VIN = 40V
0.5 5
2 10 mV
1 10
1 10 µA
1 2 µA
72 60
dB
0.2 0.5
0.2 0.5 V
3.8 4.2
3.8 4.2
V
70 dB
55 dB
12
12
MHz
00
45 49
45 49
%
%
190 200 210 180 200 220 mV
200 200 µA
0.5 0.8 1.2 0.5 0.8 1.2
0.2 1.8 0.2 1.8
V
V
50 50 µA
2 2V
17 17
V
0.4 0.4 µs
0.2 0.2 µs
7 10
7 10 mA
Note 4. FOSC = 40KHz (RT = 2.9K, CT = .01µF)
Note 5. VCM = 2.5V
Note 6. VCM = 0V
Note 7. These parameters, although guaranteed over the recommended operating conditions, are not 100% tested in production.
4/90 Rev 1.1 2/94
Copyright © 1994
LINFINITY Microelectronics Inc.
3 11861 Western Avenue Garden Grove, CA 92841
(714) 898-8121 FAX: (714) 893-2570