Nisshinbo Micro Devices NR1641

The LDO voltage regulator provides an output current of 1A, an ultra-low noise output of 3.7 μV_rms and high ripple rejection of 80 dB (f = 10 kHz). The built-in "soft-start' function controls the slope of the output voltage during power up and is available in two different start-up rates. The NR1641 offers three different operating modes; a mode pin selects between operation in a fixed fast response mode or automatically switches between fast response and low power mode based on output power demand. The chip enable pin selects the on/off mode and disables the regulator to minimise power consumption.

Key features

• LDO performance adaptable on the actual use of the application
• Option to select from two inrush current rates
• Provides high output current and ultra-low output noise
• No additional noise reduction capacitor needed

Additional features

• Input voltage range (maximum rating): 1.7 V to 5.5 V (6.5 V)
• Output voltage range: 1.0 V to 5.0 V
• Output voltage accuracy: ± 1.0% (V_SET ≥ 1.8 V, Ta = 25 °C)
• Output current: 1.0 A
• Quiescent current (V_MODE = "Low"): Typ. 17 μA
• Quiescent current (V_MODE = "High"): Typ. 1.5 mA
• Output noise voltage (10 Hz to 100 kHz):
• Typ. 3.7 μVrms (I_OUT = 100 mA)
• Typ. 20 μVrms (I_OUT = 1 mA, VMODE = "Low")
• Ripple rejection: Typ. 75 dB (f = 1 kHz, V_SET = 2.8 V): Typ. 80 dB (f = 10 kHz, V_SET = 2.8 V), Typ. 85 dB (f = 100 kHz, V_SET = 2.8 V)
• Dropout voltage: Typ. 0.10 V (I_OUT = 500 mA, V_SET = 2.8 V, NR1641GY), Typ. 0.20 V (I_OUT = 1000 mA, V_SET = 2.8 V, NR1641GY)
• Thermal shutdown function: Typ. 165 °C
• Slope of output voltage at Start-up: 200 μs/V or 500 μs/V
• Start-up inrush current limit: Typ. 250 mA
• Protection: Foldback current limit protection
• Fast / Low power automatic mode alternative function: MODE pin "low" automatic fast or low power mode, MODE pin "high" fixed to fast mode
• Ceramic capacitors are recommended: C_IN, C_OUT 10 μF or larger
• Package: DFN1616-6-GY (L1.6 x W1.6 x H0.4 mm) 

Applications

• CMOS image sensor
• Communication devices such as RF module
• Clock generation devices such as PLL or VCO
• High accuracy A/D and D/A Converters