Ricoh launches 150mA Low Supply Current LDO Regulator
Major improvements have been made in high output voltage accuracy, compared to previous products. The minimum input voltage capability of RP110 is measured at 1.4V, making this particular LDO highly suitable to cascade it with other power management ICs to create various supply voltages. Most current LDOs initiate the operation with the input voltage starting from 2.0V or more. It is preferable to use the RP110 in circuits with a power saving mode (requiring a standby voltage) as well as circuits with less demanding ripple rejection performance.
A new added feature for this device is a Constant Slope Circuit which enables a softstart function for the LDO. When the LDO is turned on by the chip enable pin, the output voltage will increase to the desired level gradually. The constant slope circuit minimizes a large inrush current caused by output capacitors, and prevents an overshoot of the output voltage during the startup period. No additional external parts are required for this softstart function, saving valuable circuit board space. The softstart delay time and the startup slope angle are fixed internally. The level of the softstart period depends on the output capacitor specifications - for capacitors above 4.7?F the current limit circuit will cause a longer startup period.
The RP110 has an embedded fold back current limit circuit, which contributes to the decrease of the output current to the level of 50mA when a short circuit occurs, protecting the LDO as well as other electronic parts from possible damage. Small ceramic capacitors with low ESR and a minimum value of 1?F are used to ensure stable operation. Optional features include an autodischarge function which secures the fast discharge of the output capacitor once the LDO is disabled, removing any possible phenomena of the application such as random graphics shown on the display or strange sounds from the speaker during the power down sequence.
The RP110 is available in regular packages: SOT23-5 and SC-88A, as well as in remarkably small DFN1010-4 and the new ultra tiny DFN(PLP)0808-4, which are convenient to use on high density or small circuit boards.
Input Voltage: Min. 1.4V to Max. 5.25V
Output Voltage: 0.8V to 3.6V
Output Voltage Accuracy: ±1.0%
Dropout Voltage: (Iout=150mA, 2.8V type) Typ. 0.28V
Output Current: Min. 150mA
Supply Current: (Iout=0mA) Typ. 1.0?A
Standby Current: Typ. 0.1?A
Temperature Drift Coefficient: Typ. ±100 ppm/°C
Protection Circuits: Constant Slope Circuit, Fold Back Current Limit
Output Capacitor: Ceramic, Min 1.0 ?F
Packages RP110N: (L2.9 x W2.8 x H1.1mm) SOT23-5
RP110Q: (L2.0 x W2.1 x H1.0mm) SC-88A RP110L: (L1.0 x W1.0 x H0.4mm) DFN1010-4
RP110K: (L0.8 x W0.8 x H0.4mm) DFN(PLP)0808-4
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