Features
- Accepts input voltages above or below regulated output voltage
- Automatic bypass mode functionality
- Automatic and seamless transitions between buck and boost modes
- Input voltage range: 1.8V to 5.5V
- Selectable forced bypass power-saving mode
- Adaptive multilevel current limit scheme to optimize efficiency at low and high currents
- Output current: up to 800mA (VIN = 2.5V, VOUT = 3.3V)
- High efficiency: up to 98%
- 41μA quiescent current maximizes light-load efficiency
- Fully protected for over-temperature and undervoltage
- Small packages
- ISL9120 - 1.41mm x 1.41mm WLCSP
- ISL9120IR - 3mm x 3mm 12 Ld TQFN
Description
The ISL9120 and ISL9120IR are highly integrated buck-boost switching regulators that accept input voltages either above or below the regulated output voltage. The regulator automatically transitions between buck and boost modes without significant output disturbance. They also have automatic bypass functionality. When the input voltage is generally within 1% to 2% of the output voltage, there will be a direct bypass connection between the VIN and VOUT pins.
In addition to the automatic bypass functionality, the ISL9120 and ISL9120IR also have forced bypass functionality with the use of the BYP pin. The device is capable of delivering up to 800mA of output current (VIN = 2.5V, VOUT = 3.3V) and provides excellent efficiency due to its adaptive current limit Pulse Frequency Modulation (PFM) control architecture.
The ISL9120 and ISL9120IR are designed for stand-alone applications and support a 3.3V fixed output voltage or variable output voltages with an external resistor divider. The forced bypass power saving mode can be chosen if voltage regulation is not required. The device consumes less than 3.5µA of current over the operating temperature range in forced bypass mode.
The ISL9120 and ISL9120IR require only a single inductor and very few external components. Power supply solution size is minimized by the ISL9120 1.41mm x 1.41mm WLCSP package and the ISL9120IR 3mm x 3mm 12 Ld TQFN package.
Parameters
| Attributes | Value |
|---|---|
| Topology [Rail 1] | Buck-Boost |
| Outputs (#) | 1 |
| Input Voltage (Min) [Rail 1] (V) | 1.8 |
| Input Voltage (Max) [Rail 1] (V) | 5.5 - 5.5 |
| Output Voltage (Min) [Rail 1] (V) | 1 |
| Output Voltage (Max) [Rail 1] (V) | 5.2 |
| Output Current (Max) [Rail 1] (A) | 0.8 |
| IQ [Rail 1] (µA) | 41 |
| Control Type | Hysteretic Mode |
| POR | Yes |
| SYNCH Capability | No |
| Peak Efficiency (%) | 98 |
| Qualification Level | Standard |
Application Block Diagrams
 | Health Monitor Band A wearable health band that reads the user's heart rate and respiration using a piezoelectric sensor. |
 | Wearable Smart Ring for Health and Connectivity Smart rings combine health tracking with NFC charging and payments plus Bluetooth LE for efficient performance. |
 | Solar-Powered Location Tracker The solar-powered location tracker offers modular design, versatile connectivity, and PV energy harvesting. |
 | PC Water Cooling System with Wireless Control Advanced PC water cooler with wireless control, efficient heat dissipation, and flexible configurations. |
 | Automated Meter Reader (AMR) Retrofit Module AMR retrofit module offers cost-efficient metrology, flexible MCU design, and extended battery life. |
Additional Applications
- Smartphones and tablets
- Portable consumer and wearable devices
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Support Communities
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Problems with ISL9120, no Boost, only Buck
Hi, I’m trying to incorporate the ISL9120 in to my product. I built some prototype breakout boards to test the device and understand more about it, but I cant seem to get them to work. I am using the fixed 3.3v version of the device. I had 5 ...
Aug 25, 2024 -
Incorrect figures in ISL9120 datasheet?
Hi, I was looking at the ISL9120 datasheet. Under "Analog Specifications" you can read that the ∆Vout/∆Iout (load regulation) is 0.0072 mV/mA for a 500 mA load, but 0.05 mV/mA for a 100 mA load. I would expect the number to be ...
Jan 11, 2023 -
ISL9120 spice model
Hi, I was wondering if there is a Spice model for ISL9120? We're using ngspice.
Jan 11, 2023
Knowledge Base
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On the adjustable version of the ISL9120, how do I set the output voltage?
Question: On the adjustable version of the ISL9120, do you have an equation for setting the output voltage? Answer: Please refer to the "Output Voltage Programming, Adjustable Version" section of the datasheet. VOUT = 0.8V x (1 + R1/R2) The suggested value of R1 is 187k. Table 1 in ...
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What is the ISL9120 switching frequency?
This device uses a PFM (Pulse Frequency Modulator) architecture where the operating frequency depends upon a number of factors, VIN, VOUT, and IOUT.Even with a fixed value VIN and a set value for VOUT, the operating frequency will change with the load current.This is discussed in the Variable ...
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Can different inductor values/sizes be used with the ISL9120?
Question: Can different inductor values/sizes be used with the ISL9120 other than the ones recommended on the datasheet? Answer: 1uH inductors of other sizes can be used as long as the saturation current ratings meet the datasheet recommendation. Note that the efficiency and transient performance may be impacted ...
Support Communities
