OM1577 Series
STEP-UP SWITCHING VOLTAGE REGULATOR IN
HERMETIC ISOLATED PACKAGE
1 Amp, 12 V, 15 V And Adjustable Output
Voltage Versions In MO-078 Metal Package
FEATURES
•
•
•
•
•
•
Similar To Industry Standard LM1577 Series
Available in 12V, 15V And Adjustable Output Voltage Versions
Hermetic Isolated Packages
Requires Few External Components
Protection Features Current And Thermal Limitations
Hi-Rel Screened
DESCRIPTION
These devices are monolithic integrated circuits that provide all of the power and control
functions for step-up (boost), flyback and converter switching regulators. They are simple to
use and cost effective as they only require a small number of external components for
implementation. The chip incorporates a 3.0 Amp NPN switch and associated protection
circuitry featuring current and thermal limitations and under voltage lockout.
ABSOLUTE MAXIMUM RATINGS
(See note 1)
Input Voltage, V
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 V
Output Switch Voltage, V
SWITCH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 V
Output Switch Current, I
SWITCH
(See note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0 A
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65°C to + 150°C
Junction Temperature, T
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Lead Soldering Temperature, (10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
Power Dissipation, P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited
Thermal Resistance:
Junction-to-Case,
q
JC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0°C/W Typically
Junction-to-Ambient,
q
JA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C/W
3.3
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range, V
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 to 40 V
Ambient Operating Temperature Range, T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to + 125°C
Output Switch Voltage Range, V
SWITCH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 60 V
Output Switch Current, I
SWITCH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0 A
Notes:
1. Stresses above the absolute maximum rating may cause damage to the device. Extended operation
at the maximum levels may degrade performance and affect reliability.
2. Output current cannot be internally limited when the device is used as a step-up regulator. To
prevent damage to the switch, the current must be externally limited to 6.0 A. However, output
current is internally limited when the device is used as a flyback or forward converter regulator.
4 11 R0
3.3 - 43
OM1577 Series
ELECTRICAL CHARACTERISTICS - OM1577-12
-55°C T
A
125°C, V
IN
= 5V, I
SWITCH
- 0A, V
FEEDBACK
= V
REF
unless otherwise specified.
Parameter
System Parameters
Output Voltage
V
OUT
V
IN
= 5V to 10V
I
LOAD
= 100mA to 800mA
Line Regulation
³V
OUT
³V
IN
Load Regulation
³V
OUT
³I
LOAD
Device Parameters
Input Supply Current
I
S
V
FEEDBACK
= 14V
(Switch Off)
I
SWITCH
= 2.0A
V
COMP
= 2.0 V, (Max. duty cycle)
Input Supply
Under-Voltage Lockout
Reference Voltage
V
REF
Measures at FEEDBACK Pin
V
IN
= 3.5V to 40V
V
COMP
= 1.0V
Error Amplifier
Transconductance
Error Amplifier
Voltage Gain
Error Amplifier
Output Swing
A
VOL
gm
I
COMP
= -30µA to +30µA
V
COMP
= 1.0V
V
COMP
= 1.1V to 1.9V
R
COMP
= 1.0M (Note 1)
V
FEEDBACK
= 10.0V
Upper Limit
V
FEEDBACK
= 15.0V
Lower Limit
Error Amplifier
Output Current
Soft Start Current
I
SS
I
EAO
V
FEEDBACK
= 10.0V to 15.0V
V
COMP
= 0V
V
FEEDBACK
= 10.0V
V
COMP
= 0V
Maximum Duty Cycle
D
C
I
SWITCH
= 100mA
V
COMP
= 1.5 V
•
•
•
•
±120
±280
2.2
7.0
93
%
90
-1.0
•
-1.0
360
µA
700
.65
V
•
3.5
•
Oscillator Frequency
f
o
Measured at SWITCH pin,
I
SWITCH
= 100mA
•
2.9
48
42
.85
5.3
A
6.0
56
kHz
62
•
•
•
•
11.76
11.64
210
130
40
V/V
20
2.1
1.9
5.0
V
5.0
0.45
V
0.60
±300
µA
±400
7.5
µA
9.5
12.24
V
12.36
515
µmho
615
V
UV
I
SWITCH
= 100mA
•
•
2.70
2.65
•
14
18
mA
60
95
3.10
V
3.15
V
IN
= 3.5V to 10V
I
LOAD
= 300mA
V
IN
= 5V
I
LOAD
= 100mA to 800mA
•
•
•
11.60
11.40
12.40
V
12.60
60
mV
120
60
mV
120
Symbol
Test Conditions
Min.
Max.
Unit
3.3
Switch Leakage Current
I
L
V
FEEDBACK
= 15V
V
SWITCH
= 65V, switch off
Switch Saturation Voltage
V
SAT
V
COMP
= 2.0V
I
SWITCH
= 2.0A (Max. Duty Cycle)
NPN Switch Current Limit
V
COMP
= 2.0V
Notes:
The
•
denotes the specifications which apply over the full operating temperature range.
1. A 1.0 M resistor is connected to the COMPENSATION pin (error amplifier output) to ensure accuracy in measuring A
VOL
.
In actual applications, the COMPENSATION pin’s load resistance should be 10 M , resulting in A
VOL
that is typically
twice the guaranteed minimum limit.
2. OM1577-ADJ have the same test conditions as OM1577-12 (see Test Circuit on page 3).
3.3 - 44
OM1577 Series
ELECTRICAL CHARACTERISTICS - OM1577-15
-55°C T
A
125°C, V
IN
= 5V, I
SWITCH
- 0A, V
FEEDBACK
= V
REF
unless otherwise specified.
Parameter
System Parameters
Output Voltage
V
OUT
V
IN
= 5V to 12V
I
LOAD
= 100mA to 600mA
Line Regulation
³V
OUT
³V
IN
Load Regulation
³V
OUT
³V
LOAD
Device Parameters
Input Supply Current
I
S
V
FEEDBACK
= 18V
(Switch Off)
I
SWITCH
= 2.0A
V
COMP
= 2.0 V, (Max. duty cycle)
Input Supply
Under-Voltage Lockout
Reference Voltage
V
REF
Measures at FEEDBACK Pin
V
IN
= 3.5V to 40V
V
COMP
= 1.0V
Error Amplifier
Transconductance
Error Amplifier
Voltage Gain
Error Amplifier
Output Swing
A
VOL
gm
I
COMP
= -30µA to +30µA
V
COMP
= 1.0V
V
COMP
= 1.1V to 1.9V
R
COMP
= 1.0M (Note 1)
V
FEEDBACK
= 12.0V
Upper Limit
V
FEEDBACK
= 18.0V
Lower Limit
Error Amplifier
Output Current
Soft Start Current
I
SS
I
EAO
V
FEEDBACK
= 12.0V to 18.0 V
V
COMP
= 1.0V
V
FEEDBACK
= 12.0V
V
COMP
= 0V
Maximum Duty Cycle
D
C
I
SWITCH
= 100mA
V
COMP
= 1.5 V
Switch Leakage Current
I
L
V
FEEDBACK
= 18V
V
SWITCH
= 65V, switch off
Switch Saturation Voltage
V
SAT
V
COMP
= 2.0V
I
SWITCH
= 2.0A (Max. Duty Cycle)
NPN Switch Current Limit
V
COMP
= 2.0V
•
Oscillator Frequency
f
o
Measured at SWITCH pin,
I
SWITCH
= 100mA
•
•
3.5
2.9
48
42
•
•
•
•
•
±120
±280
2.2
7.0
93
%
90
-1.0
-1.0
360
µA
700
.65
V
.85
5.3
A
6.0
56
kHz
62
•
•
•
•
14.70
14.55
160
400
35
V/V
15
2.1
1.9
5.0
V
5.0
0.45
V
0.60
±300
µA
±400
7.5
µA
9.5
15.30
V
15.45
420
µmho
500
V
UV
I
SWITCH
= 100mA
•
•
2.70
2.65
•
14
18
mA
60
95
3.10
V
3.15
V
IN
= 3.5V to 12V
I
LOAD
= 300mA
V
IN
= 5V
I
LOAD
= 100mA to 600mA
•
•
•
14.50
14.25
15.50
V
15.75
60
mV
120
60
mV
120
Symbol
Test Conditions
Min.
Max.
Unit
3.3
Notes:
The
•
denotes the specifications which apply over the full operating temperature range.
1. A 1.0 M resistor is connected to the COMPENSATION pin (error amplifier output) to ensure accuracy in measuring A
VOL
.
In actual applications, the COMPENSATION pin’s load resistance should be 10 M , resulting in A
VOL
that is typically
twice the guaranteed minimum limit.
3.3 - 45
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