RC4190M Raytheon Company, RC4190M Datasheet
RC4190M
Manufacturer Part Number
RC4190M
Description
SOP8
Manufacturer
Raytheon Company
Datasheet
1.RC4190M.pdf
(25 pages)
Specifications of RC4190M
Date_code
05+
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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.
Block Diagram
RC4190
Micropower Switching Regulator
LBR
Gnd
C
L
X
X
Q1
4190
OSC
C2
C1
1.31V
BIAS
REF
+1.31V
+1.2V
65-3464-01
Q2
LBD
V
I
+V
C
FB
S
• Accurate oscillator frequency – 10%
• Remote shutdown capability
• Low battery detection circuitry
• Low component count
• 8-lead packages including small outline (SO-8)
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
sistor is referenced to ground. It is complemented by another
Raytheon micropower switching regulator, the RC4391,
which is dedicated to step-down (V
V
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.
OUT
OUT
= –V
> V
IN
IN
) circuits because the NPN internal switch tran-
) applications. Between the two devices the
Electronics
Semiconductor Division
OUT
< V
IN
) and inverting
Rev. 1.0.0
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