ISL854102FRZ-T - 40V 1.2A Sync Buck Regulator | Renesas
N.º de pieza: ISL854102FRZ-T ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.42 | $2,42 |
| 10 | $2.18 | $21,80 |
| 100 | $1.94 | $194,00 |
| 500 | $1.69 | $845,00 |
| 1.000 | $1.45 | $1.450,00 |
ISL854102FRZ-T Descripción general
A synchronous buck regulator (also called a step-down switching converter) is a type of DC-DC converter that uses pulse-width modulation with an integrated or external MOSFET pair to reduce a higher DC input voltage to a lower, regulated DC output voltage. Buck regulators sit inside the broader power management IC (PMIC) hierarchy: switching regulator -> DC-DC converter -> power management IC -> semiconductor. Synchronous variants replace the external Schottky diode with a low-side MOSFET, improving efficiency (typically 90 % to 95 %) and reducing conduction loss compared with asynchronous buck designs.
Key features of the ISL854102FRZ-T include internal compensation that eliminates external loop components, PFM mode for improved light-load efficiency, a forced-PWM option for noise-sensitive applications, internal/external soft-start control, and a PGOOD (power-good) output. Protection features include overcurrent protection (OCP), overvoltage protection (OVP), undervoltage lockout (UVLO), and thermal shutdown. The wide 40 V input tolerance makes the part robust against load-dump transients common on 12 V/24 V automotive rails.
The ISL854102 uses peak-current-mode control with a fixed internal compensation network, simplifying design-in and reducing external component count to typically one inductor, input/output capacitors, and feedback resistors. The adjustable frequency (300 kHz to 2 MHz) allows designers to trade efficiency against solution size or to avoid AM-band interference.
Typical applications include industrial 24 V distributed power systems, 12 V/24 V automotive electronics, telecom point-of-load rails, general-purpose 5 V/3.3 V/1.8 V/1.0 V conversion, battery-powered equipment, and FPGA/MCU supply rails. The combination of 40 V input tolerance, 1.2 A output current, and a small DFN-12 EP footprint makes it particularly attractive for compact industrial designs where space is at a premium.
When designing with this device, derate output current versus ambient temperature using the package's thermal resistance; pair the exposed pad with sufficient PCB copper (at least 1 square inch top-side copper). For noise-sensitive loads, disable PFM mode by tying the MODE pin to VIN to force continuous PWM operation. Ensure that the feedback divider uses 1 % resistors and that input capacitance is rated for the full 40 V stress with adequate ripple-current rating.
This page synthesizes distributor pricing (DigiKey, Mouser, LCSC, Octopart as of 2026-10-05), drop-in alternatives drawn from same-package same-family Renesas parts, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para ISL854102FRZ-T — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ISL854102FRZ-T7A
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL854102FRZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL85410
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL8500IRZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL8022IRZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL854102FRZ-T Valores máximos y características eléctricas
| Topología | Synchronous Buck (Step-Down) |
| Rango de tensión de entrada | 3 V to 40 V |
| Rango de tensión de salida | 0.6 V to 34 V (adjustable) |
| Continuous Output Current | 1.2 A |
| Número de salidas | 1 |
| Frecuencia de conmutación | 500 kHz default; 300 kHz to 2 MHz programmable |
| MOSFETs | Internal high-side and low-side NMOS |
| Light-Load Mode | PFM with forced-PWM option |
| Internal Compensation | Yes |
| Arranque suave | Internal / external programmable |
| Power Good (PGOOD) | Yes |
| Temperatura de funcionamiento | -40 C to +125 C |
| Encapsulado | 12-pin DFN-EP (4x3 mm) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| Nivel MSL | 1 (per JEDEC J-STD-020) |
Configuración de pines de ISL854102FRZ-T
| Pin 1 | VIN — Input voltage supply; connect to input rail with 1 uF to 10 uF local bypass capacitor |
| Pin 2 | EN — Enable input; drive high to enable regulator, low to disable (low-Iq shutdown) |
| Pin 3 | PGOOD — Power-good open-drain output; pull up to logic rail with 100 kohm resistor |
| Pin 4 | MODE — Mode select; high = forced PWM, low/floating = auto PFM/PWM |
| Pin 5 | RT/SYNC — Frequency-setting resistor to AGND, or external clock sync input |
| Pin 6 | SS/TRK — Soft-start / tracking; capacitor to AGND sets soft-start time |
| Pin 7 | FB — Feedback input; connect to output resistor divider for adjustable Vout |
| Pin 8 | COMP — Compensation node (internal compensation used in this part) |
| Pin 9 | AGND — Analog ground; connect to PGND plane at single point |
| Pin 10 | PGND — Power ground; return path for internal low-side FET |
| Pin 11 | SW — Switch node; connect to output inductor |
| Pin 12 | PAD — Exposed thermal pad; solder to PCB copper pour for heat dissipation |
Aplicaciones típicas
ISL854102FRZ-T es adecuado para 6 aplicacións: 24 V Industrial Distributed Power, 12 V / 24 V Automotive Electronics, Telecom Point-of-Load Conversion, FPGA / MCU Core Rail Supply, Battery-Powered Portable Equipment, General-Purpose 5 V / 3.3 V / 1.8 V / 1.0 V Conversion.
24 V Industrial Distributed Power
The ISL854102FRZ-T is purpose-built for 24 V industrial distributed power architectures. Its 3 V to 40 V input range comfortably absorbs the 24 V nominal rail plus +/-20 % tolerance and 36 V transient overshoots typical in factory PLC and sensor-bus installations. The 1.2 A continuous output current covers most point-of-load requirements - microcontroller cores, isolated transceiver rails, op-amp supply, and small sensor arrays. Internal compensation eliminates external loop components, reducing BOM count to one inductor, input/output capacitors, and feedback resistors. Compared with a discrete buck using external MOSFETs, the integrated switch pair cuts PCB area in half and avoids gate-drive layout pitfalls. At 500 kHz default switching, a 10 uH to 22 uH inductor achieves >90 % efficiency across 100 mA to 1.2 A loads, making the ISL854102FRZ-T ideal for compact DIN-rail modules and IP67 sealed field transmitters.
Recomendado
12 V / 24 V Automotive Electronics
The ISL854102FRZ-T serves 12 V and 24 V automotive subsystems requiring post-regulation from the vehicle bus. The 40 V input maximum handles 12 V jump-start events and 24 V truck-bus load-dump transients without external TVS suppression in most designs. The integrated high-side and low-side NMOS FETs, plus internal OCP/OVP/UVLO/thermal shutdown, deliver the fault robustness automotive ECUs require. For under-hood and chassis-mounted modules, choose the AEC-Q100 -T7A variant; the standard -T variant suits cabin-mounted infotainment, body controllers, and ADAS sensor pre-regulation. PFM mode extends battery life during standby, while forced-PWM prevents audible noise on audio amplifiers. At 4x3 mm the DFN-12 EP fits behind connectors and inside small sealed housings common to sensor clusters and lighting ECUs.
Recomendado
Telecom Point-of-Load Conversion
In telecom equipment the ISL854102FRZ-T converts a 12 V or 24 V intermediate bus into the 5 V, 3.3 V, 1.8 V, or 1.0 V rails that FPGAs, DSPs, and high-speed ADCs require. The 500 kHz default switching frequency (programmable 300 kHz to 2 MHz) allows designers to place the switching harmonic above the AM broadcast band or out of sensitive IF passbands. Forced-PWM mode eliminates the variable-frequency noise of PFM, which would otherwise alias into adjacent channels on mixed-signal boards. The wide 40 V input also protects against ringing on long-input harnesses when upstream eFuses or hot-swap controllers switch. The PGOOD output enables downstream rail sequencing, and the soft-start pin can be paralleled with a tracking input for coordinated ramp-up with master timing references.
Recomendado
FPGA / MCU Core Rail Supply
The ISL854102FRZ-T delivers up to 1.2 A at adjustable 0.6 V to 34 V output, making it well suited for FPGA core, MCU core, and DDR memory rails. Many modern microcontrollers draw 0.5 A to 0.9 A peak at 1.0 V to 1.2 V, well within the ISL854102's capability with margin for transients. The 500 kHz default frequency and small DFN-12 EP footprint enable placement adjacent to the load IC, minimizing the high-di/dt power-loop inductance that causes voltage spikes during load steps. PGOOD output can drive the FPGA/MCU's ENABLE or RESET input to hold the load in reset until the rail is in regulation. At 1 V output from 12 V input, efficiency reaches roughly 88 % to 92 % at 0.5 A load, much better than a comparable LDO would achieve at the same conditions.
Recomendado
Battery-Powered Portable Equipment
In battery-powered portable equipment the ISL854102FRZ-T's wide input range accepts single-cell Li-ion (3 V to 4.2 V), two-cell Li-ion in series (6 V to 8.4 V), or 4-cell to 6-cell NiMH stacks. PFM mode drops quiescent current at light loads to extend battery life during standby. The EN pin supports low-Iq shutdown with sub-microamp leakage when the system is off. Forced-PWM can be enabled during active transmission bursts (e.g., LoRa, BLE, Wi-Fi) to avoid frequency modulation of the switching noise into the RF spectrum. The internal soft-start limits inrush to comply with USB and battery-specifier inrush limits. The 4x3 mm DFN-12 EP package fits comfortably inside wearable housings, handheld test meters, and battery-backed sensor beacons.
Recomendado
General-Purpose 5 V / 3.3 V / 1.8 V / 1.0 V Conversion
Beyond specialized applications, the ISL854102FRZ-T is a strong general-purpose buck for the four most common point-of-load voltages: 5 V from 12 V or 24 V, 3.3 V from 5 V or 12 V, 1.8 V from 3.3 V or 5 V, and 1.0 V from 3.3 V or 5 V. Internal compensation removes the design loop-tuning step, so engineers can produce a working converter with just a bill of materials of inductor, capacitors, and two feedback resistors. The wide 300 kHz to 2 MHz switching range lets designers choose inductor size: 300 kHz for high efficiency at high currents, 2 MHz for sub-2 mm-tall inductors in thin designs. Robust protection (OCP, OVP, UVLO, thermal shutdown) and the 40 V input tolerance make the ISL854102 a versatile stocking part for design labs and contract manufacturers who service diverse end-customer applications.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ISL854102FRZ-T — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ISL854102FRZ-T7A | ISL854102FRZ | ISL85410 | ISL8500IRZ | ISL8022IRZ |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | DFN-12 EP (4x3 mm) | DFN-12 EP (4x3 mm) - same | DFN-12 EP (4x3 mm) - same | DFN-12 EP (4x3 mm) - same | DFN-12 EP (4x3 mm) - same | DFN-12 EP (4x3 mm) - same |
| Input Voltage Range | 3 V to 40 V | 3 V to 40 V | 3 V to 40 V | 3 V to 40 V | 3 V to 25 V | 3 V to 36 V |
| Output Current | 1.2 A | 1.2 A | 1.2 A | 1.2 A | 2 A | 4 A single / 2 A + 2 A dual |
Diferenciadores clave
- Wide 40 V input with 1.2 A output in compact DFN-12 EP (4x3 mm) (frente a ISL8500IRZ)
- Single 1.2 A output with simpler feedback network (frente a ISL8022IRZ)
- AEC-Q100 option available in same footprint (-T7A suffix) (frente a Generic 40 V buck competitors)
Notas de diseño
Estimated: at VIN=12 V, VOUT=5 V, IOUT=1.2 A, the ISL854102FRZ-T dissipates approximately (12 - 5) * 1.2 = 8.4 W of total loss less conversion efficiency. Accounting for typical 90 % efficiency, internal power dissipation is roughly 0.8 W to 1.0 W. The DFN-12 EP package has a theta-JA around 35 C/W on a 1 square inch copper pour, producing a 35 C junction-temperature rise. At 85 C ambient, junction temperature reaches roughly 120 C - just below the 125 C thermal-shutdown limit. For sustained 1.2 A operation above 85 C ambient, increase copper area to 2 to 3 square inches on top layer plus thermal vias to inner planes, or reduce switching frequency to 300 kHz to drop switching loss.
Place input bypass capacitor (1 uF to 10 uF X7R ceramic rated 50 V) within 2 mm of the VIN pin and the exposed pad. The power loop (VIN -> high-side FET -> SW -> inductor -> output cap -> PGND -> low-side FET -> PGND) must be minimized: keep this loop area under 0.5 square cm to limit ringing and radiated EMI. Connect AGND and PGND at a single point directly under the exposed pad to avoid ground-bounce coupling into the feedback divider. Route the FB trace away from the SW node (minimum 3 mm clearance) and keep it short to avoid noise pickup that corrupts output-voltage regulation.
Do not omit the bootstrap capacitor on the high-side FET driver - the ISL854102 uses the SW node to charge the bootstrap, and missing capacitance causes the high-side FET to fail to fully turn on, dropping efficiency and possibly destroying the part at high currents. Use only ceramic output capacitors rated for the full output voltage with adequate ripple-current rating (e.g., X7R 1210 100 uF 6.3 V for a 5 V output). Do not place a feedback-divider resistor higher than 100 kohm total - the ISL854102 FB input bias current is small but not zero, and large resistors shift output voltage by a few percent.
The exposed thermal pad must be soldered to a copper pour - dry solder joints on the pad cause 30 % to 50 % increase in junction temperature. Use an array of 0.3 mm thermal vias (8 to 12 vias) under the pad to spread heat into inner copper planes. Keep the SW-node copper short and narrow to limit radiated EMI; if the design must pass CISPR 22 Class B radiated emissions, add a small RC snubber (1 ohm + 1 nF) from SW to PGND. Place the RT resistor close to the RT/SYNC pin with the AGND return tied directly to the AGND pin, not the noisy PGND plane.
Información de cumplimiento
Standard -T variant is industrial/consumer grade. For AEC-Q100 automotive qualification, select the -T7A suffix variant which shares the same silicon and package.
