Features: • High efficiency 85% typical
• Low quiescent current 215 mA
• Adjustable output 1.3V to 30V
• High switch current 200 mA
• Bandgap reference 1.31V
• Accurate oscillator frequency ±10%
• Remote shutdown capability
• Low battery detection circuitry
• Low component count
• 8-lead packages including small outline (SO-8)Pinout
Specifications
| Parameter |
Min |
Typ |
Max |
Units |
Supply Voltage (Without External
Transistor) |
RM4190 |
|
|
30 |
V |
| RC4190 |
|
|
24 |
V |
|
PDTA< 50 |
SOIC |
|
|
300 |
mW |
| PDIP |
|
|
468 |
mW |
| CerDIP |
|
|
833 |
mW |
| Operating Temperature |
RM4190 |
-55 |
|
125 |
|
| RC4190 |
0 |
|
70 |
|
| Storage Temperature |
|
-65 |
|
150 |
|
| Junction Temperature |
SOIC, PDIP |
|
125 |
|
|
| CerDIP |
|
175 |
|
|
| Switch Current |
Peak |
|
|
375 |
mA |
| For TA> 50 Derate at |
SOIC |
|
4.17 |
|
mW/ |
| PDIP |
|
6.25 |
|
mW/ |
| CerDIP |
|
8.33 |
|
mW/ |
DescriptionThe RC4190 monolithic IC is a low power switch mode regulator intended for miniature power supply applications. This DC-to-DC converter IC provides all of the active components 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 215A.
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 application 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 (VOUT> VIN) circuits because the NPN internal switch transistor is referenced to ground. It is complemented by another Raytheon micropower switching regulator, the RC4391, which is dedicated to step-down (VOUT < VIN) and inverting VOUT= VIN) applications. Between the two devices the ability to create all three basic switching regulator configurations is assured. Refer to the RC4391 data sheet for stepdown and inverting applications.
With some optional external components the application circuit of RC4190 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.
RC4190 Data Sheet
