Overview
The ADP2121ACBZ-1875R7 is a high-frequency, low quiescent current step-down dc-to-dc converter produced by Analog Devices Inc. This device is optimized for portable applications where board area and battery life are critical. It operates at a 6 MHz frequency, enabling the use of tiny ceramic inductors and capacitors, which helps in reducing the overall size of the solution. The ADP2121 provides up to 600 mA of continuous output current and supports fixed output voltages of 1.8 V, 1.82 V, 1.85 V, 1.875 V, and 2.3 V.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Voltage Range | VOUT = 1.8 V, 1.82 V, 1.85 V, 1.875 V | 2.3 | 5.5 | V | |
| Input Voltage Range | VOUT = 2.3 V | 2.9 | 5.5 | V | |
| Quiescent Current | Auto mode, no load, not switching, TA = −40°C to 85°C | 36 | 56 | µA | |
| Quiescent Current | PWM mode, no load | 10 | mA | ||
| Shutdown Current | VOUT = 1.8 V, 1.82 V, 1.85 V, 1.875 V, VEN = 0 V, TA = −40°C to 85°C | 0.3 | 1 | µA | |
| Shutdown Current | VOUT = 2.3 V, VEN = 0 V, TA = −40°C to 85°C | 0.4 | 1.5 | µA | |
| Output Current | 600 | mA | |||
| Operating Frequency | 6 | MHz |
Key Features
- High efficiency synchronous step-down dc-to-dc converter
- Operates from a 2.3 V to 5.5 V input voltage range
- Fixed output voltages: 1.8 V, 1.82 V, 1.85 V, 1.875 V, and 2.3 V
- Up to 600 mA continuous output current
- 6 MHz operating frequency for use with tiny ceramic inductors and capacitors
- Automatic power-saving mode with pulse-frequency modulation (PFM) for light loads
- Forced PWM mode for improved transient performance
- Internal synchronous rectifier and internal compensation
- Internal soft start to limit inrush current at startup
- Undervoltage lockout (UVLO) and thermal shutdown protection
- Cycle-by-cycle current-limit protection and output to ground short-circuit protection
- Enable/shutdown logic input
- Ultrasmall 6-ball, 0.4 mm pitch, 1.17 mm² WLCSP package
Applications
- Mobile phones
- Digital cameras
- Digital audio equipment
- Portable electronic devices
Q & A
- What is the input voltage range of the ADP2121ACBZ-1875R7?
The input voltage range is from 2.3 V to 5.5 V for output voltages of 1.8 V, 1.82 V, 1.85 V, and 1.875 V, and from 2.9 V to 5.5 V for an output voltage of 2.3 V.
- What are the fixed output voltages available for the ADP2121ACBZ-1875R7?
The fixed output voltages are 1.8 V, 1.82 V, 1.85 V, 1.875 V, and 2.3 V.
- What is the maximum output current of the ADP2121ACBZ-1875R7?
The maximum output current is up to 600 mA.
- What is the operating frequency of the ADP2121ACBZ-1875R7?
The operating frequency is 6 MHz.
- Does the ADP2121ACBZ-1875R7 have power-saving features?
Yes, it has an automatic power-saving mode that uses pulse-frequency modulation (PFM) for light loads to reduce power consumption.
- What kind of protection features does the ADP2121ACBZ-1875R7 have?
The device includes undervoltage lockout (UVLO), thermal shutdown protection, cycle-by-cycle current-limit protection, and output to ground short-circuit protection).
- What is the package type of the ADP2121ACBZ-1875R7?
The device is packaged in an ultrasmall 6-ball, 0.4 mm pitch, 1.17 mm² WLCSP package).
- What are some typical applications for the ADP2121ACBZ-1875R7?
Typical applications include mobile phones, digital cameras, digital audio equipment, and other portable electronic devices).
- Does the ADP2121ACBZ-1875R7 support forced PWM mode?
Yes, it supports forced PWM mode for improved transient performance at light loads).
- What is the quiescent current of the ADP2121ACBZ-1875R7 in auto mode?
The quiescent current in auto mode is typically 56 µA).
- What is the shutdown current of the ADP2121ACBZ-1875R7?
The shutdown current is typically 0.3 µA for output voltages other than 2.3 V and 0.4 µA for a 2.3 V output voltage).
