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Электронный компонент: RC4190N

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Electronics
Semiconductor Division
Features
High efficiency 85% typical
Low quiescent current 215
A
Adjustable output 1.3V to 30V
High switch current 200 mA
Bandgap reference 1.31V
Description
The RC4190 monolithic IC is a low power switch mode reg-
ulator intended for miniature power supply applications.
This DC-to-DC converter IC provides all of the active com-
ponents needed to create supplies for micropower circuits
(load power up to 400 mW, or up to 10W with an external
power transistor). Contained internally are an oscillator,
switch, reference, comparator, and logic, plus a discharged
battery detection circuit.
Application areas include on-card circuits where a non-standard
voltage supply is needed, or in battery operated instruments
where an RC4190 can be used to extend battery lifetime.
These regulators can achieve up to 85% efficiency in most
applications while operating over a wide supply voltage
range, 2.2V to 30V, at a very low quiescent current drain of
215
A.
The standard application circuit requires just seven external
components for step-up operation: an inductor, a steering
diode, three resistors, a low value timing capacitor, and an
electrolytic filter capacitor. The combination of simple appli-
cation circuit, low supply current, and small package make
the RC4190 adaptable to a wide range of miniature power
supply applications.
The RC4190 is most suited for single ended step-up
(V
OUT
> V
IN
) circuits because the NPN internal switch tran-
sistor is referenced to ground. It is complemented by another
Raytheon micropower switching regulator, the RC4391,
which is dedicated to step-down (V
OUT
< V
IN
) and inverting
V
OUT
= V
IN
) applications. Between the two devices the
ability to create all three basic switching regulator configura-
tions is assured. Refer to the RC4391 data sheet for step-
down and inverting applications.
With some optional external components the application
circuit can be designed to signal a display when the battery
has decayed below a predetermined level, or designed to
signal a display at one level and then shut itself off after the
battery decays to a second level. See the applications section
for these and other unique circuits.
The RC4190 micropower switching regulator series consists
of three devices, each with slightly different specifications.
The RM4190 has a 1.5% maximum output voltage tolerance,
0.2% maximum line regulation, and operation to 30V. The
RC4190 has a 5.0% maximum output voltage tolerance,
0.5% maximum line regulation, and operation to 24V. Other
specifications are identical. Each type is available in plastic
and ceramic DIPs, or SO-8 packages.
Accurate oscillator frequency
10%
Remote shutdown capability
Low battery detection circuitry
Low component count
8-lead packages including small outline (SO-8)
Block Diagram
C2
C1
1.31V
REF
Q2
OSC
BIAS
LBR
V
FB
+V
S
I
C
L
X
C
X
Gnd
4190
+1.2V
LBD
65-3464-01
+1.31V
Q1
RC4190
Micropower Switching Regulator
Rev. 1.0.0
PRODUCT SPECIFICATION
RC4190
2
Absolute Maximum Ratings
(beyond which the device may be damaged)1
Note:
1. Functional operation under any of these conditions is NOT implied.
Operating Conditions
Parameter
Min
Typ
Max
Units
Supply Voltage (Without External
Transistor)
RM4190
30
V
RC4190
24
V
P
D
T
A
< 50
C
SOIC
300
mW
PDIP
468
mW
CerDIP
833
mW
Operating Temperature
RM4190
-55
125
C
RC4190
0
70
C
Storage Temperature
-65
150
C
Junction Temperature
SOIC, PDIP
125
C
CerDIP
175
C
Switch Current
Peak
375
mA
For T
A
> 50
C Derate at
SOIC
4.17
mW/
C
PDIP
6.25
mW/
C
CerDIP
8.33
mW/
C
Parameter
Min
Typ
Max
Units
JC
Thermal resistance
CerDIP
45
C/W
JA
Thermal resistance
SOIC
200
C/W
PDIP
160
C/W
CerDIP
120
C/W
Pin Assignments
LBR
C
X
GND
L
X
LBD
V
FB
I
C
+V
S
8
65-3464-02
7
6
5
1
2
3
4
Pin Definitions
Pin
Name
Pin
Number
Pin Function Description
LBR
1
Low Battery (Set) Resistor
C
X
2
Timing Capacitor
Gnd
3
Ground
L
X
4
External Inductor
+V
S
5
Positive Supply Voltage
I
C
6
Reference Set Current
V
FB
7
Feedback Voltage
LBD
8
Low Battery Detector Output
RC4190
PRODUCT SPECIFICATION
3
Electrical Characteristics
(+V
S
= +6.0V, I
C
= 5.0
A over the full operating temperature range unless otherwise noted.)
Symbol Parameters
Conditions
RM4190
RC4190
Units
Min
Typ
Max
Min
Typ
Max
+V
S
Supply Voltage
2.6
30
2.6
24
V
V
REF
Reference Voltage
(Internal)
1.25
1.31
1.37
1.20
1.31
1.42
V
I
SY
Supply Current
Measure at Pin 5
I
4
= 0
235
350
235
350
A
Line Regulation
0.5 V
OUT
< V
S
<
V
OUT
0.2
0.5
0.5
1.0
% V
O
L
I
Load Regulation
V
S
= 0.5 V
OUT
P
L
= 150 mW
0.5
1.0
0.5
1.0
% V
O
I
C
Reference Set Current
1.0
5.0
50
1.0
5.0
50
A
I
CO
Switch Leakage Current
V
4
= 24V (RC4190)
30V (RM4190)
30
30
A
I
SO
Supply Current
(Disabled)
V
C
200 mV
30
30
A
I
LBD
Low Battery Output
Current
V
8
= 0.4V, V
1
= 1.1V
500
1200
500
1200
A
Oscillator Frequency
Temperature Drift
200
200
ppm/
C
PRODUCT SPECIFICATION
RC4190
4
Electrical Characteristics
(+V
S
= +6.0V, I
C
= 5.0
A, and T
A
= +25
C unless otherwise noted.)
RM4190
RC4190
Symbol
Parameters
Conditions
Min
Typ
Max
Min
Typ
Max
Units
+V
S
Supply Voltage
2.2
30
2.2
24
V
V
REF
Reference Voltage
(Internal)
1.29
1.31
1.33
1.24
1.31
1.38
V
I
SW
Switch Current
V
4
= 400 mV
100
200
100
200
mA
I
SY
Supply Current
Measure at Pin 5
I
4
= 0
215
300
215
300
A
ef
Efficiency
85
85
%
Line Regulation
0.5 V
OUT
< V
S
<
V
OUT
0.04
0.2
0.04
0.5
% V
O
L
I
Load Regulation
V
S
= +0.5 V
OUT
P
L
= 150 mW
0.2
0.5
0.2
0.5
% V
O
F
O
Operating Frequency
Range
0.1
25
75
0.1
25
75
kHz
I
C
Reference Set Current
1.0
5.0
50
1.0
5.0
50
A
I
CO
Switch Leakage
Current
V
4
= 24V (RC4190)
30V (RM4190,
RC4190A)
0.01
5.0
0.01
5.0
A
I
SO
Supply Current
(Disabled)
V
C
200 mV
0.1
5.0
0.1
5.0
A
I
1
Low Battery Bias
Current
V
1
= 1.2V
0.7
0.7
A
I
CX
Capacitor Charging
Current
8.6
8.6
A
Oscillator Frequency
Tolerance
10
10
%
+V
THX
Capacitor Threshold
Voltage +
1.4
1.4
V
-V
THX
Capacitor Threshold
Voltage
0.5
0.5
V
I
FB
Feedback Input
Current
V
7
= 1.3V
0.1
0.1
A
I
LBD
Low Battery Output
Current
V
8
= 0.4V, V
1
= 1.1V
500
1500
500
1500
A
RC4190
PRODUCT SPECIFICATION
5
Typical Performance Characteristics
Figure 1. Minimum Supply Voltage vs. Temperature
Figure 2. Quiescent Current vs. Temperature
Figure 3. Reference Voltage vs. Temperature
Figure 4. Oscillator Frequency vs. Temperature
Figure 5. Minimum Supply Voltage vs. Temperature
4.0
3.0
2.0
1.0
0
-75
-50
-25
0
+25
+50
+75 +100 +125
1.8V
2.0V
2.4V
V
S
(V)
T
A
(
C)
65-2670
I
Q
(
A)
T
A
(
C)
65-2671
300
250
200
150
100
50
0
-75
-50
-25
0
+25
+50
+75 +100 +125
230
215
195
V = +6V
S
V
REF
(V)
T
A
(
C)
65-1488
1.33
1.32
1.31
1.30
1.29
1.28
-75
-50
-25
0
+25
+50
+75 +100 +125
F
O
(Normalized) (%)
T
A
(
C)
65-2672
+2.0
+1.5
+1.0
+0.5
0
-0.5
-1.0
-1.5
-2.0
-75
-50
-25
0
+25
+50
+75 +100 +125
F
O
(Normalized) (%)
+V
S
(V)
65-2667
+2
+1
0
-1
-2
0
5
10
15
20
25
30