Information
Ricoh Electronic Devices Co., Ltd. launches ultra-low quiescent current DCDC converters, and low noise and low supply current LDO regulator for wearables and IoT devices
Dec. 5, 2017
Ricoh Electronic Devices Co., Ltd.
Ricoh Electronic Devices Co., Ltd. launched buck DCDC converters RP511/RP512 and a buck-boost DCDC converter RP604 with ultra-low quiescent current, and an LDO regulator RP122 with low noise and low supply current.
As IoT market expands, the strong market demands such as long-time battery driving, low noise, and miniaturization are increasing for IoT terminals. Our newly released products enable to meet the demands for IoT terminals with sensors, microcomputers, and communication ICs.
RP511 Series / RP512 Series
The RP511/RP512 is a buck DCDC converter operates at the minimum input voltage of 2.0 V and achieves 300 nA quiescent current at no load and 10 nA ultra-low standby current. These features greatly contribute to the long-time battery driving.
| Input Voltage Range (Max. Rating) | 2.0 V to 5.5 V (6.5 V) | ||
|---|---|---|---|
| Operating Quiescent Current | Typ. 300 nA | ||
| Standby Current | Typ. 10 nA | ||
| Output Current | 100 mA (RP511) | 300 mA (RP512) | |
| Output Voltage Range | 1.0 V to 4.0 V (0.1 V step) | ||
| Output Voltage Accuracy | ±1.5% (Vset ≥ 1.2 V) ±18 mV (Vset < 1.2 V) |
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| LX Current Limit | Typ. 430 mA (RP511) | Typ. 580 mA (RP512) | |
| Soft-start Time | Typ. 10 ms | ||
| Auto-discharge Function | Disable / Enable | ||
| Protection | UVLO | ||
| Packages | WLCSP-8-P1, DFN(PLP)2527-10Under Development, SOT-89-5Under Development | ||
Key Features and Specifications
RP604 Series
The RP604 is a buck-boost DCDC converter operates at the minimum input voltage of 1.8 V and enables a continuous battery use with the boost operation even if the battery voltage drops below the use voltage. The flatted output voltage prevents malfunction of system devices by facilitating system designs and supporting a rapid power voltage drop.
The RP604 also achieves 300 nA quiescent current at no load and 10 nA ultra-low standby current contributing to the long-time battery driving.
| Input Voltage Range (Max. Rating) | 1.8 V to 5.5 V (6.5 V) |
|---|---|
| Operating Quiescent Current | Typ. 300 nA |
| Standby Current | Typ. 10 nA |
| Output Current | 300 mA (at Buck) |
| Output Voltage Range | 1.6 V to 5.2 V (0.1 V step) |
| Output Voltage Accuracy | ±1.5% |
| LX Current Limit | Typ. 900 mA |
| Soft-start Time | Typ. 20 ms |
| Auto-discharge Function | Disable / Enable |
| Protection | UVLO, OVP, Thermal Shutdown, LX Peak Current |
| Packages | WLCSP-20-P2, DFN(PLP)2730-12 |
Key Features and Specifications
RP122 Series
The RP122 is an LDO regulator with low noise and low supply current. While having the low supply current of 9.5 µA, this device achieves 8 µVrms output noise when the output current is 250 mA and 90 dB (f = 1 kHz) ripple rejection when the output current is 20 mA without a noise bypass capacitor.
| Input Voltage Range (Max. Rating) | 1.9 V to 5.25 V (6.0 V) |
|---|---|
| Operating Quiescent Current | Typ. 9.5 µA |
| Standby Current | Typ. 10 nA |
| Output Current | 400 mA |
| Output Voltage Range | 1.2 V to 4.8 V (0.1 V step) |
| Output Voltage Accuracy | ±1.0% |
| Dropout Voltage | Typ. 0.17 V (Vset = 2.8 V, Iout = 400 mA) |
| Ripple Rejection | Typ. 90 dB (f = 1 kHz) Typ. 85 dB (f = 10 kHz) Typ. 65 dB (f = 100 kHz) |
| Output Noise | Typ. 8 µVrms (Iout = 250 mA) |
| Short Current Limit | Typ. 50 mA |
| Protection | Inrush Current Limit, Thermal Shutdown |
| Ceramic Capacitor | 1.0 µF or more (no need of noise bypass capacitor) |
| Packages | DFN(PLP)1010-4, WLCSP-4-P8Under Development |