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Ricoh Semiconductor Support Centre launches the RP112 Series 150mA High-End Low Noise Voltage Regulator
The RP112's high ripple rejection of 80dB (at 1kHz), even at higher frequencies of 100kHz results in scores of 65dB and an additional circuit has been added to reduce its output noise. While standard LDOs may have an output noise level in the range of 30mVrms or higher, the RP112 performs at 10mVrms. With such a low output noise, it is particularly suited as a power source for audio circuits or noise sensitive RF circuits.
A high output voltage accuracy of 1% and temperature drift coefficient of only 30ppm/°C are additional features. Using CMOS technology, the RP112 consumes just 75?A supply current making it particularly suitable for battery powered applications.
An embedded fold-back current limit circuit decreases the output current in the case of a short circuit to approximately 40mA, protecting the LDO and other electronic parts of the application from damage during a short circuit condition. Another slope control circuit is included to prevent high inrush currents during the power up sequence. The output voltage is controlled and increases gradually, preventing high inrush current peaks and overshoot of the output voltage.
For stable operation small ceramic capacitors with low ESR and a minimum value of 1.0?F can be used. An optional feature is the auto-discharge function, which discharges the output capacitor quickly once the LDO is disabled.
RP112 is available in a regular SOT23-5, SC-88A and a small DFN(PLP)1010-4 package, convenient to use on high density and small circuit boards.
Input Voltage: Min. 2.0V to Max. 5.25V
Output Voltage: (in 100mV step) 1.2V to 4.0V
Output Voltage Accuracy: ±1.0%
Dropout Voltage: Typ. 200mV at 150mA
Output Current: Min. 150mA
Supply Current: Typ. 75?A
Standby Current: Typ. 0.1?A
Ripple Rejection: (f = 1kHz/10kHz/100kHz) Typ. 80dB/75dB/65dB
Temperature Coefficient: Typ. ±30ppm/°C
Protection Circuits: (Fold Back) Short Protection, Peak Current Limit
Output Capacitor: Ceramic, Min. 1.0?F
RP112N: (L2.9 x W2.8 x H1.2mm) SOT23-5
RP112Q: (L2.0 x W2.1 x H1.1mm) SC-88A
RP112K: (L1.0 x W1.0 x H0.6mm) DFN(PLP)1010-4
Ricoh Company Ltd. is a leading global manufacturer of office automation equipment. The line up includes copiers, multifunctional and other printers, fax machines, personal computers, CD-Recordable, CD-ReWritable and DVD-ReWritable drives and media, and related supplies and services as well as digital cameras and advanced electronic devices. Ricoh is rapidly building a solid presence worldwide as a provider of comprehensive document solutions that help customers streamline their business and cut operating cost. The Ricoh Group has 319 companies -of which 199 outside Japan- together employing over 76,000 people.
Ricoh Europe (Netherlands) B.V. is Ricoh Company Ltd.'s regional headquarters. Located in Amstelveen, The Netherlands, it is responsible for marketing, sales and service of Ricoh's products in Europe, the Middle East and Africa. In Europe, Ricoh has three manufacturing sites: two at Ricoh UK Products Ltd. Telford, UK; GR Advanced Materials Ltd., Stirling, UK; and Ricoh Industries France S.A., Colmar, France. In addition, Ricoh Europe's European network comprises 14 sales subsidiaries and affiliates. In the fiscal year ending March 31, 2006, revenues from Ricoh's European operations totalled over € 3 billion, accounting for 22.7% of the company's global revenues. Ricoh's worldwide sales increased with 5.6% totalling over € 13.6 billion. In March 2001 Ricoh established the European Semiconductor Support Centre to support distributors and customers with their applications or other enquiries about Power Management and Real Time Clock ICs.
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