ISL8121IRZ-T

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ISL8121IRZ-T

IC REG CTRLR BUCK 24QFN

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Especificaciones

Supplier Renesas Electronics America Inc
Package Tape & Reel (TR)
ProductStatus Active
OutputType Transistor Driver
Function Step-Down
OutputConfiguration Positive
Topology Buck
NumberofOutputs 2
OutputPhases 2
Voltage-Supply(Vcc/Vdd) 4.9V ~ 5.5V
Frequency-Switching 150kHz ~ 2MHz
DutyCycle(Max) 66%
SynchronousRectifier Yes
ClockSync No
ControlFeatures Current Limit, Enable, Soft Start, Tracking
OperatingTemperature -40°C ~ 85°C (TA)
MountingType Surface Mount
Package/Case 24-VFQFN Exposed Pad

Descripción general

Description

ISL8121IRZ-T is a high-performance PWM controller from Intersil (Renesas) used to build buck regulators for CPU cores and other high-current rails. It drives external MOSFETs in synchronous buck configurations and supports single- or multi-phase operation for fast transient response and high current.
Key points:
- Uses current-mode control with programmable switching frequency and dead-time.
- Adjustable output voltage via feedback divider; supports soft-start and enable/shutdown.
- Protection features: undervoltage lockout and cycle-by-cycle overcurrent protection (short‑circuit/overload protection).
- Requires external components: MOSFETs, inductor, input/output capacitors, and sense resistor (for current limit) to form a complete regulator.
- IRZ-T denotes the specific package/lead-free variant of the device.
Typical use: CPU/GPU/ASIC core voltage rails and other high-current buck regulators.
Note: For exact pinout, electrical characteristics, and application guidelines, consult the ISL8121IRZ-T datasheet.

Features

ISL8121IRZ-T features (highlights):
- Dual-phase, high-efficiency buck controller with gate-driver outputs for multi-rail VRMs
- Wide input range suitable for CPU/telecom rails
- Programmable output voltage via external feedback network
- Current-mode control with fast overcurrent protection
- UVLO, OVP, thermal shutdown protection
- Soft-start, enable control, and power-good signaling
- Programmable switching frequency with clock synchronization option
- External compensation network for stability and performance
- RoHS-compliant, compact IRZ package

Package

ISL8121IRZ-T uses an 8-pin IRZ package, i.e., an 8‑pin SOIC package (tape‑and‑reel variant indicated by the -T).

Pinout

- Pin count: 8 pins (8‑pin package, ISL8121IRZ-T in a standard SOIC/MSOP‑8 form).
- Function: A voltage‑mode PWM controller for buck DC‑DC converters; provides oscillator, reference, enable/UVLO, soft‑start, current‑limit, and feedback functionality to drive external MOSFETs and regulate the output voltage.

Manufacturer

Manufacturer: Intersil (the ISL prefix is Intersil’s branding). Intersil is a semiconductor company that designs and manufactures analog and mixed‑signal integrated circuits, including power-management ICs. In 2017, Intersil became a subsidiary of Renesas Electronics Corporation.

Application

ISL8121IRZ-T is a dual-channel synchronous buck controller for multi-phase VRMs. Applications include CPU core/memory and GPU power rails in desktops/servers, FPGA/ASIC power supplies, high-efficiency POL regulators on motherboards, and telecom/industrial DC-DC power modules requiring compact, efficient regulation.

Equivalent

ISL8121IRZ‑T is an Intersil CPU-VRM multiphase buck controller. There isn’t an exact drop‑in cross. Functionally similar parts from major vendors include:
- TI UCC28950/UCC28951 (digital multiphase VRM)
- Monolithic Power Systems MP216x/MP214x family
- Richtek RT8250/RT8297
- Analog Devices / Renesas equivalents (check ADP2370, etc.)
Always verify pinout, phasing, input/output voltage ranges and features in the datasheets before substituting.

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