The main difference between the RP152 and RP153 are the number of input voltage terminals. The RP152 has one shared input for both integrated LDOs whilst the RP153 has two individual inputs for both LDOs in order to operate completely independently from each other.
An additional optional feature of the RP152 is sequenced start up. This means that the LDO1 starts up 100µs earlier than LDO2. The shut down feature is also sequenced by using auto-discharge transistors with a different on-resistance level. The auto-discharge transistor is connected between the LDO output and ground and it discharges the output capacitor fast once the LDO is disabled, preventing a phenomenon such as random graphics on the display or sounds from the speaker during the shut-down period.
RP153 is available in a standard version with average current consumption and good transient response, additionally another optional version is available, with enhanced transient response characteristics however with increased supply current level. Each LDO, which is integrated in RP152 and RP153, can be set with a specific output voltage and can provide an output current of 150mA. Regarding protection circuits, an embedded fold-back current limit circuit decreases the output current in case of a short circuit to approximately 40mA, thus protecting the LDO and other electronic parts of the application from damage. For stable operation small ceramic capacitors with low ESR and with a minimum value of 0.22µF can be used. RP152 is available in a regular SOT23-6 and ultra tiny DFN1212-6 packages, RP153 in DFN1216-8 only. Both products are very convenient to use on high density and small circuit boards.
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| Input Voltage | Min. 1.4V to Max. 5.25V |
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| Output Voltage | (in 0.1V step) 0.8V to 3.6V |
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| Output Voltage Accuracy | ±1.0% |
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| Dropout Voltage | (Iout = 150mA, 2.8V type) Typ. 0.22V |
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| Output Current | Min. 150mA |
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| Supply Current | (VR1, VR2) 40µA |
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| (Enhanced transient version RP153xxx1D & E) 80µA |
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| Standby Current | Typ. 0.1µA |
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| Ripple Rejection | (f = 1kHz) Typ. 70dB |
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| Temperature Coefficient | Typ. ±80ppm/°C |
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| Protection Circuits | Fold Back Current Limit |
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| Output Capacitor | Ceramic, Min. 0.22µF |
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| Package RP152N | (L2.9 x W2.8 x H1.1mm) SOT23-6 |
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| Package RP152L | (L1.2 x W1.2 x H0.4mm) DFN1212-6 |
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| Package RP153L | (L1.2 x W1.6 x H0.4mm) DFN1216-8 |
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Note to Editors
About Ricoh
Ricoh Company, Ltd ("Ricoh Company") is a global technology leader, specializing in the office and production printing markets. Ricoh works with organisations around the world to modernise work environments and optimise document efficiency. With over 108,500 employees worldwide, it operates in Europe, the Americas, Asia Pacific, China and Japan.
Ricoh Europe Holdings Plc is a public limited company and the EMEA headquarters of Ricoh Company with operations located in London, United Kingdom and Amstelveen, the Netherlands. The EMEA operations comprise over 35 sales subsidiaries and affiliates.
In the fiscal year ended 31 March 2009, revenues from Ricoh's EMEA operations totalled over YEN 523.4 billion accounting for 25.0 per cent of Ricoh Company's global revenues. Ricoh Company's worldwide sales totalled over YEN 2,091.7 billion during the year ended 31 March 2009. www.ricoh-europe.com
Ricoh Electronic Devices Company (REDC) is in charge of semiconductor business in Ricoh Company, Limited. REDC develops and supplies semiconductor devices for image processing products of Ricoh Group company and supplies standard semiconductor devices for the customers. The head office of REDC is located in Osaka Japan with its branches in Europe, the U.S.A., Korea, China and Taiwan.
For further information, please contact:
Ricoh Europe Netherlands B.V.
Prof. W.H.Keesomlaan 1
1183 DL Amstelveen
The Netherlands
P.O.Box 114
1180 AC Amstelveen
Hans Adams, Manager
Semiconductor Support Centre
Phone: +31 (0)20-5474309
Fax: +31 (0)20-5474791
Homepage: www.ricoh.com/LSI/
E-mail: semicon@ricoh-europe.com
