Features
- VIN range 2.7V to 5.5V
- IOUT maximum is 2A
- External soft-start programmable
- Output tracking and sequencing
- Switching frequency is 2MHz
- Selectable PFM or PWM operation option
- Overcurrent and short-circuit protection
- Over-temperature/thermal protection
- VIN undervoltage lockout and VOUT overvoltage protection
- Up to 95% peak efficiency
Description
The ISL8002B is a highly efficient, monolithic, synchronous step-down DC/DC converter that can deliver up to 2A of continuous output current from a 2. 7V to 5. 5V input supply. It uses peak current mode control architecture to allow very low duty cycle operation. ISL8002B operates at a 2MHz switching frequency, thereby providing superior transient response and allowing for the use of a small inductor. ISL8002B also has excellent stability. The ISL8002B integrates very low rDS(ON) MOSFETs in order to maximize efficiency. In addition, since the high-side MOSFET is a PMOS, the need for a boot capacitor is eliminated, thereby reducing external component count. The device can be configured for either PFM (discontinuous conduction) or PWM (continuous conduction) operation at light load. PFM provides high efficiency by reducing switching losses at light loads and PWM for fast transient response, which helps reduce the output noise and RF interference. The device is offered in a space saving 8 Ld 2mmx2mm TDFN Pb-free package with exposed pad for improved thermal performance. The complete converter occupies less than 64mm2 area.
Parameters
| Attributes | Value |
|---|---|
| Topology [Rail 1] | Buck |
| Outputs (#) | 1 |
| Input Voltage (Min) [Rail 1] (V) | 2.7 |
| Input Voltage (Max) [Rail 1] (V) | 5.5 - 5.5 |
| Output Voltage (Min) [Rail 1] (V) | 0.6 |
| Output Voltage (Max) [Rail 1] (V) | 4 |
| Output Current (Max) [Rail 1] (A) | 2 |
| Switching Frequency Range (Typical) (kHz) | 1700 - 2300 |
| Control Type | Current Mode |
| Peak Efficiency (%) | 95 |
| IQ [Rail 1] (µA) | 35 |
| SYNCH Capability | No |
| Qualification Level | Standard |
| Temp. Range (°C) | -40 to +85°C, -40 to +125°C |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| TDFN | 2.0 x 2.0 x 0.75 | 8 | 0.5 |
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Renesas Boards & Kits
Compact Sync Buck Regulator Demo Board with 2.7V to 5.5V Vin Range and 1.8V 2A Output
The ISL8002BDEMO1Z demonstration kit is intended for point-of-load applications sourcing from 2.7V to 5.5V. The ISL8002BDEMO1Z demo board is used to demonstrate the performance of the ISL8002B low quiescent current mode converter.
The ISL8002B is a highly efficient, monolithic, synchronous... Read More
Knowledge Base
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How does the SS/TR work on the ISL8002B?
Question: How does the SS/TR work? Answer: For internal soft-start, simply connect SS/TR to Vin. For output tracking and sequencing, please refer to "Output Tracking and Sequencing" section of the datasheet.
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How big should the output inductor be on the ISL8002B?
Question: How big should the output inductor be? Answer: Please refer to the table in the datasheet. As for the current specification, the inductor should be able to support up to the overloading of the ISL8002B without saturation.
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What modes does the ISL8002B support?
Question: What modes does the ISL8002B support? Answer: When the MODE pin is set high, the frequency is fixed at 2 MHz, PWM, regardless of output load. Connect the MODE pin to logic low, then the ISL8002B operates in automatic PFM/PWM. This means that the operational frequency is ...
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