Tiny Dual LDO Features High Ripple Rejection

Aug. 27, 2008
Seiko Instruments’ S-1721 series of 2-channel, 150-mA positive low dropout regulators (LDOs) features high output-voltage accuracy, low current consumption, and 80 dB typ of ripple rejection

Seiko Instruments’ S-1721 series of 2-channel, 150-mA positive low dropout regulators (LDOs) features high output-voltage accuracy, low current consumption, and 80 dB typ of ripple rejection.

Device type: 150-mA low dropout regulator
Input voltage range: 1.7 V to 6.5 V
Output voltage range: 1.2 V to 5.0 V, selectable in 0.05 V steps
Output voltage accuracy: ±1.0%
Quiescent current: 25 µA typ., 45 µA max. during operation for products with 3.0-V output per channel;: 0.1 µA typ., 1.0 µA max. during shutdown
Features: 130-mV dropout voltage typ. at VOUT = 3.0 V and IOUT = 100 mA, 80-dB typ. ripple rejection with output under 1.8 V at 1.0 kHz, overcurrent protection, on-off function, choice of pull-up or pull-down resistor, operation with a ceramic capacitor of 1.0 µF or more on I/O
Operating temperature range (ambient): -40°C to +85°C
Packaging: 1.57-mm x 1.80-mm x 0.48-mm SNT-6A or 2.9-mm x 2.8-mm x 1.35-mm SOT-23-6
RoHS compliant? leadfree
Target applications: cell phones and other battery-powered devices
Pricing: $0.32 each in quantities of 10,000
Availability: available now
Data sheet posted on web? yes, http://datasheet.sii-ic.com/en/
voltage_regulator/S1721_E.pdf

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