深圳市辰睿半导体有限公司

ISL9122AAIRNZ-T   Hearing aid devThe ISL9122AAIRNZ-T is a highly integrated non-inverting
buck-boost switching regulator that accepts input
voltages both above or below the regulated output
voltage. It features an extremely low quiescent current
consumption of 1300nA in Regulation mode, 120nA in
Forced Bypass mode, and 8nA in Shutdown mode. It
provides 84% efficiency at 10μA load (VIN = 3.6V,
VOUT = 3.3V) and has peak efficiency greater than
97% (VIN = 3.6V, VOUT = 3.3V). It supports input
voltages from 1.8V to 5.5V. ISL9122AAIRNZ-T
The ISL9122A has automatic bypass functionality for
situations in which the input voltage is close to the
output voltage, and it automatically transitions
between Buck and Boost modes without significant
output disturbance. In addition to the automatic
bypass functionality, the Forced Bypass power saving
mode can be chosen if voltage regulation is not
required. Forced Bypass power saving mode is
accessible using the I2C interface bus.
The ISL9122A is capable of delivering up to 500mA of
output current (VIN > VOUT > 2.5V) and provides
excellent efficiency because of its adaptive frequency
hysteretic control architecture. ISL9122AAIRNZ-T 
The ISL9122A is designed for stand-alone
applications and supports a default output voltage at
Power-On Reset (POR). After POR, the output
voltage can be adjusted in the range of 1.8V to
5.375V by using the I2C interface bus. Specific default
output voltages are available upon request.
The ISL9122AAIRNZ-T requires only a single EIA 0603 size
inductor and a minimum of two external capacitors.
Power supply solution size is minimized by a
1.8mmx1.0mm 8 Bump WLCSP and it is also
available in a 3.0mmx2.0mm 8 Ld plastic DFN.
Features  ISL9122AAIRNZ-T
? 1300nA quiescent current  
? 84% efficiency at 10μA load (VIN = 3.6V,
VOUT = 3.3V)
? 97% peak efficiency (VIN = 3.6V, VOUT = 3.3V)
? Input voltage range: 1.8V to 5.5V
? Output voltage range: 1.8V to 5.375V
? Output current: up to 500mA (VIN > VOUT > 2.5V)
? Selectable Forced and Auto Bypass power saving
modes  ISL9122AAIRNZ-T
? Seamless PWM/PFM and buck/boost transition
? I2C control and voltage adjustability
? Hysteretic controller
? Small 1.8mmx1.0mm 8 Bump WLCSP and 3.0mm
x 2.0mm 8 Ld DFN packages
Applications ISL9122AAIRNZ-T
? Smart watches and wristband devices
? Wireless earphones
? Internet of Things (IoT) devices
? Water, gas, and oil meters
? Portable medical devices  ISL9122AAIRNZ-T
ices