SG1825C / SG2825C / SG3825C
H
IGH
-S
PEED
C
URRENT
-M
ODE
PWM
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O V A T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
The SG1825C is a high-performance pulse
drivers. This device can be used to
width modulator optimized for high frequency implement either current mode or voltage-
current-mode power supplies. Included in the mode switching power supplies. It also is
controller are a precision voltage reference,
useful as a series-resonant controller to
micro power start-up circuitry, soft start, high- frequencies beyond 1MHz. The SG1825C is
frequency oscillator, wideband error amplifier, specified for operation over the full military
fast current limit comparator, full double-pulse ambient temperature range of -55°C to
suppression logic, and dual totem pole output 125°C.
drivers. Innovative circuit design and an
The SG2825C is characterized for the
advanced linear Schottky process result in
industrial range of -25°C to 85°C, and the
very short propagation delays through the
SG3825C is selected for the commercial
current limit comparator, logic, and output
range of 0°C to 70°C.
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
KEY FEATURES
IMPROVED REFERENCE
INITIAL TOLERANCE (±1%
max.)
IMPROVED OSCILLATOR
INITIAL ACCURACY (±3% typ.)
IMPROVED STARTUP
CURRENT (500µA typ.)
PROP DELAY TO OUTPUTS
(50ns typ.)
10V TO 30V OPERATION
5.1V REFERENCE TRIMMED
TO ±1%
2MHZ OSCILLATOR
CAPABILITY
1.5A PEAK TOTEM-POLE
DRIVERS
U.V. LOCKOUT WITH
HYSTERESIS
NO OUTPUT DRIVER "FLOAT"
PROGRAMMABLE
SOFTSTART
DOUBLE-PULSE
SUPPRESSION LOGIC
WIDEBAND LOW-IMPEDANCE
ERROR AMPLIFIER
CURRENT-MODE OR
VOLTAGE-MODE CONTROL
WIDE CHOICE OF HIGH-
FREQUENCY PACKAGES
PRODUCT HIGHLIGHT
I
NITIAL
O
SCILLATOR
A
CCURACY
15
Percentage of Units - %
Sample Size = 279
Mean 401.661
Std. Dev. = 3.8
10
KEY FEATURES
5
AVAILABLE TO MIL-STD-883B
MICROSEMI LEVEL "S"
PROCESSING AVAIL.
0
390
395
400
405
410
415
Initial Oscillator Accuracy - KHz
PACKAGE ORDER INFO
T
J
(°C)
0 to 70
-25 to 85
-55 to 125
MIL-STD-883
DESC
N
Plastic DIP
16-Pin
DW
Plastic SOIC
16-Pin
Q
Plastic LCC
20-Pin
J
Ceramic DIP
16-Pin
L
Ceramic LCC
20-Pin
RoHS Compliant / Pb-free
Transition DC: 0503
RoHS Compliant / Pb-free
Transition DC: 0516
SG3825CN
SG2825CN
-
-
-
SG3825CDW
SG2825CDW
-
-
-
SG32825CQ
SG2825CQ
-
-
-
SG3825CJ
-
SG282CJ
-
SG1825CJ
SG1825CL
SG1825CJ/883B
SG1825CL/883
SG1825CJ/DESC SG1825CL/DESC
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. SG3825CN-TR)
Copyright
©
1994
Rev. 1.3a,2005-03-21
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
SG1825C/SG2825C/SG3825C
H
IGH
- S
PEED
C
URRENT
-M
O D E
PWM
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PACKAGE PIN OUTS
INV. INPUT
N.I. INPUT
E/A OUTPUT
CLOCK
R
T
C
T
RAMP
SOFTSTART
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
RoHS Peak Package Solder Reflow Temp. (40 sec. max. exp.)......................................................... 260° (+0, -5)
Input Voltage (V
IN
and V
C
) .......................................................................................... 30V
Analog Inputs:
Error Amplifier and Ramp ........................................................................ -0.3V to 7.0V
Softstart and I
LIM
/S.D. ................................................................................ -0.3V to 6.0V
Digital Input (Clock) .................................................................................... 1.5V to 6.0V
Driver Outputs ........................................................................................ -0.3V to V
C
+1.5V
Source / Sink Output Current (each output):
Continuous .............................................................................................................. 0.5A
Pulse, 500ns ............................................................................................................ 2.0A
Softstart Sink Current ................................................................................................ 20mA
Clock Output Current ................................................................................................. 5mA
Error Amplifier Output Current ................................................................................. 5mA
Oscillator Charging Current ....................................................................................... 5mA
Operating Junction Temperature:
Hermetic (J, L Package) ....................................................................................... 150°C
Plastic (DW, N, Q Packages) ............................................................................... 150°C
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature (soldering, 10 seconds) ............................................................ 300°C
Note 1. Exceeding these ratings could cause damage to the device.
V
REF
+V
IN
OUTPUT B
V
C
PWR GND
OUTPUT A
GROUND
I
LIM
/ S.D.
J & N* PACKAGE
(Top View)
INV. INPUT
N.I. INPUT
E/A OUTPUT
CLOCK
R
T
C
T
RAMP
SOFTSTART
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
+V
REF
+V
IN
OUTPUT B
V
C
PWR GND
OUTPUT A
GROUND
I
LIM
/ S.D.
DW PACKAGE*
(Top View)
3
2
1
20 19
T H E R M A L D ATA
N PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
DW PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
Q PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
J PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
L PACKAGE:
THERMAL RESISTANCE-JUNCTION TO CASE,
θ
JC
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
35°C/W
120°C/W
4
5
6
7
8
4
18
17
16
15
14
9
10 11 12 13
65°C/W
95°C/W
80°C/W
80°C/W
5
6
7
8
Q PACKAGE
(Top View)
3
2
1 20 19
18
17
16
15
14
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
9 10 11 12 13
L PACKAGE
(Top View)
1. N.C.
2. INV. INPUT
3. N.I. INPUT
4. E/A OUTPUT
5. CLOCK
6. N.C.
7. R
T
8. C
T
9. RAMP
10. SOFTSTART
11. N.C.
12. I
LIM
/ S.D.
13. GROUND
14. OUTPUT A
15. PWR GND
16. N.C.
17. V
C
18. OUTPUT B
19. +V
IN
20. V
REF
*DW & N Packages: RoHS / Pb-free 100% Matte Tin Lead Finish
2
Copyright © 1994
Rev. 1.3a
PRODUCT DATABOOK 1996/1997
SG1825C/SG2825C/SG3825C
H
IGH
-S
PEED
C
URRENT
-M
ODE
PWM
R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S
Parameter
Supply Voltage Range
Voltage Amp Common Mode Range
Ramp Input Voltage Range
Current Limit / Shutdown Voltage Range
Source / Sink Output Current
Continuous
Pulse, 500ns
Voltage Reference Output Current
Oscillator Frequency Range
Oscillator Charging Current
Oscillator Timing Resistor
Oscillator Timing Capacitor
Operating Ambient Temperature Range:
SG1825C
SG2825C
SG3825C
Note 2. Range over which the device is functional.
(Note 2)
Symbol
Recommended Operating Conditions
Min.
Typ.
Max.
10
1.5
0
0
200
1.0
1
4
0.030
1
0.470
0
-25
-55
10
1500
3
100
10
70
85
125
30
5.5
5.0
4.0
Units
V
V
V
V
mA
A
mA
kHz
mA
kΩ
nF
°C
°C
°C
R
T
C
T
T
A
T
A
T
A
ELECTRICAL CHARACTERISTICS
(Note 3)
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG3825C with 0°C
≤
T
A
≤
70°C, SG2825C with
-25°C
≤
T
A
≤
85°C, SG1825C with -55°C
≤
T
A
≤
125°C, and V
IN
=V
C
=15V. Low duty cycle pulse testing techniques are used which maintains junction
and case temperatures equal to the ambient temperature.)
Parameter
Reference Section
Output Voltage
Line Regulation
Load Regulation
Temperature Stability (Note 3)
Total Output Range (Note 3)
Output Noise Voltage (Note 3)
Long Term Stability (Notes 3 &4)
Short Circuit Current
Symbol
Test Conditions
T
J
= 25°C, I
L
= 1mA
V
IN
= 10 to 30V
I
L
= 1 to 10mA
Over Operating Temperature
Over Line, Load, and Temperature
f = 10Hz to 10kHz, I
L
= 0mA
T
J
= 125°C, t = 1000hrs
V
REF
= 0V
T
J
= 25°C, C
CLK
≤
10pF
V
IN
= 10 to 30V
Over Rated Operating Temperature
Over Line and Temperature
R
T
= 100KΩ, C
T
= 0.01µF
R
T
= 1KΩ, C
T
= 470pF
I
CLK
= -1mA
I
CLK
= -1mA
SG1825C/2825C
SG3825C
Units
Min. Typ. Max. Min. Typ. Max.
5.05 5.10 5.15 5.05 5.10 5.15
2
15
2
15
5
15
5
15
0.2 0.4
0.2 0.4
5.00
5.20 5.00
5.20
50 200
50
5
25
5
25
-15 -50 -100 -15 -50 -100
370
400
0.2
5
430
2
8
450
4
370
400
0.2
5
430
2
8
450
4
V
mV
mV
mV/°C
V
µV
RMS
mV
mA
kHz
%
%
kHz
kHz
MHz
V
V
V
V
V
Oscillator Section
(Note 5)
Initial Accuracy
Voltage Stability
Temperature Stability (Note 3)
Total Frequency Limits (Note 3)
Minimum Frequency
Maximum Frequency
Clock High Level
Clock Low Level
Ramp Peak Voltage
Ramp Valley Voltage
Valley-to-Peak Amplitude
350
1.5
3.9
2.6
0.7
1.6
350
1.5
3.9
4.5
2.3
2.8
1.0
1.8
2.9
3.0
1.25
2.0
2.6
0.7
1.6
4.5
2.3
2.8
1.0
1.8
2.9
3.0
1.25
2.0
Note 3. This parameter is guaranteed by design and process control, but is not 100% tested in production.
Note 4. This parameter is non-accumulative, and represents the random fluctuation of the reference voltage within some error band when observed
over any 1000 hour period of time.
Copyright © 1994
Rev. 1.3a
3
PRODUCT DATABOOK 1996/1997
SG1825C/SG2825C/SG3825C
H
IGH
- S
PEED
C
URRENT
-M
O D E
PWM
ELECTRICAL CHARACTERISTICS
Parameter
Error Amplifier Section
(Note 6)
Input Offset Voltage
Input Bias Current
Input Offset Current
DC Open Loop Gain
Common Mode Rejection
Power Supply Rejection
Output Sink Current
Output Source Current
Output High Voltage
Output Low Voltage
Unity Gain Bandwidth (Note 3)
Slew Rate (Note 3)
Ramp Input Bias Current
Minimum Duty Cycle
Maximum Duty Cycle (Note 8)
Zero Duty Cycle Threshold
Delay to Driver Output (Note 3)
R
S
≤
2KΩ, V
ERROR
= 2.5V
V
ERROR
= 2.5V
V
ERROR
= 2.5V
V
ERROR
= 1 to 4V
Over Rated Voltage Range, V
ERROR
= 2.5V
V
IN
= 10V to 30V, V
ERROR
= 2.5V
V
ERROR
= 1V
V
ERROR
= 4V
I
ERROR
= -0.5mA
I
ERROR
= 1mA
A
VOL
= 0dB
(Cont'd.)
Symbol
Test Conditions
SG1825C/2825C
SG3825C
Units
Min. Typ. Max. Min. Typ. Max.
15
3
1
60
75
85
1
-0.5
4.0
0
3
6
15
3
1
mV
µA
µA
dB
dB
dB
mA
mA
V
V
MHz
V/µsec
µA
%
%
V
ns
µA
mA
µA
V
V
ns
V
V
V
V
µA
ns
V
V
mA
mA
A
VOL
60
75
85
1
-0.5
4.0
0
3
6
0.6
0.1
95
95
110
2.5
-1.3
4.7
0.5
5.5
5.0
1.0
0.6
0.1
95
95
110
2.5
-1.3
4.7
0.5
5.5
5.0
1.0
PWM Comparator Section
(Note 5 & 7)
-1
V
ERROR
= 1V
V
ERROR
= 4V
V
RAMP
= 0V to 2V, V
ERROR
= 2V
V
SOFTSTART
= 0.5V
V
SOFTSTART
= 1.0V
3
1
85
1.1
-5
0
85
1.1
80
20
3
1
-1
-5
0
1.25
50
9
1.25
50
9
80
20
Softstart Section
C
SS
Charge Current
C
SS
Discharge Current
Current Limit / Shutdown Section
(Note 9)
I
LIM
Input Bias Current
Current Limit Threshold
Shutdown Threshold
Delay to Driver Output (Note 3)
±15
±10
0.9 1.0 1.1 0.9 1.0 1.1
1.25 1.40 1.55 1.20 1.40 1.55
50
80
50
80
0.25 0.40
0.25 0.40
1.2 2.0
1.2 2.0
13.0 13.5
13.0 13.5
12.0 13.0
12.0 13.0
150 500
150 500
30
60
30
60
8.8
0.4
V
IN
= 8V
V
INV
, V
RAMP
, V(I
LIM
/S.D.) = 0V, V
N.I.
= 1V
9.2
0.8
0.5
22
9.7
1.2
1.2
33
8.8
0.4
9.2
0.8
0.5
22
9.7
1.2
1.2
33
V
SHUTDOWN
= 0V to 1.2V
I
SINK
= 20mA
I
SINK
= 200mA
I
SOURCE
= 20mA
I
SOURCE
= 200mA
V
C
= 30V
C
L
= 1000pF
Output Drivers Section (each output)
Output Low Level
Output High Level
V
C
Standby Current
Output Rise / Fall Time (Note 3)
Undervoltage Lockout Section
Start Threshold Voltage
UV Lockout Hysteresis
Supply Current Section
(Note 5)
Start Up Current
Operating Current
Note
Note
Note
Note
Note
5. F
OSC
= 400kHz (R
T
= 3.65kΩ, C
T
= 1.0nF).
6. V
CM
= 1.5V to 5.5V.
7. V
RAMP
= 0V, unless otherwise specified.
8. 100% duty cycle is defined as a pulsewidth equal to one oscillator period.
9. V(I
LIM
/S.D.) = 0V to 4.0V, unless otherwise specified.
4
Copyright © 1994
Rev. 1.3a
PRODUCT DATABOOK 1996/1997
SG1825C/SG2825C/SG3825C
H
IGH
-S
PEED
C
URRENT
-M
ODE
PWM
BLOCK DIAGRAM
V
REF
+9V
16
13
V
C
11
OUTPUT A
+V
IN
15
GND
10
CLOCK
4
REFERENCE
REGULATOR
+ 4.0V
Q
T
Q
14
OUTPUT B
R
T
5
OSCILLATOR
C
T
6
1.25V
RAMP
7
E/A OUTPUT
3
N.I. INPUT
2
ERROR
INV. INPUT
1
9µA
SOFTSTART
8
+ 1.0V
S
R Q
12
POWER GND
9
I
LIM
/S.D.
+ 1.4V
FIGURE INDEX
Application Circuits
FIGURE #
1.
2.
3.
4.
5.
6.
7.
HIGH-SPEED LAYOUT AND BYPASSING
MICROPOWER STARTUP
SOFTSTART FAST RESET
OSCILLATOR SYCHRONIZATION
OSCILLATOR FUNCTIONAL DIAGRAM
VOLTAGE AMPLIFIER CONNECTIONS
DRIVING SHIELDED CABLE
Copyright © 1994
Rev. 1.3a
5
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