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Renesas ISL78201AVEZ-T
- Part No.:
- ISL78201AVEZ-T
- Manufacturer:
- Renesas
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
ISL78201AVEZ-T.pdf
- Description:
- IC REG BCK BST ADJ 2.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL78201AVEZ-T from Renesas Electronics is an AEC-Q100 qualified 40V, 2.5A synchronous buck or boost-buck DC/DC controller with integrated high-side MOSFET and low-side gate driver. It supports 3V–40V input in buck mode and extends down to 2.5V in boost-buck mode, delivers ±1% output voltage regulation accuracy, and operates across –40°C to +105°C for automotive cold-cranking and start-stop systems.
For engineers reviewing the ISL78201AVEZ-T datasheet, ISL78201AVEZ-T pinout, ISL78201AVEZ-T application, or ISL78201AVEZ-T equivalent, key selection considerations include its dual-mode topology support (synchronous/non-synchronous buck, two-stage boost-buck), programmable 200kHz–2.2MHz switching frequency, cycle-by-cycle overcurrent protection with hiccup mode, and 300µA quiescent current in PFM mode.
Technical Context
The ISL78201AVEZ-T implements peak current mode control with integrated slope compensation and a 0.8V reference for precise feedback regulation. Its dual LDO architecture-main bias LDO (VIN-powered) and auxiliary LDO (AUXVCC-powered)-enables VCC switchover to reduce internal power dissipation during steady-state operation.
Topology flexibility is enabled by configurable pin functions: EXT_BOOST determines boot/buck mode at power-up; MODE selects forced PWM or PFM with programmable load boundary; LGATE drives external low-side MOSFETs in buck or boost configurations; and SYNC supports multi-phase synchronization with automatic 180° phase shift between master/slave ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | Buck: 3V–40V; Boost-buck: down to 2.5V - enables operation during automotive battery sag below VOUT. |
| Output Current Capability | 2.5A continuous - defined by thermal limits and integrated high-side MOSFET rDS(ON) of 140mΩ max at +25°C. |
| Switching Frequency | 200kHz–2.2MHz, programmable via FS resistor or synchronizable externally - allows EMI optimization and inductor size reduction. |
| Quiescent Current | 300µA (PFM, no load); 180µA (PFM, no load, AUXVCC tied to VOUT) - extends battery runtime in always-on automotive modules. |
| Voltage Regulation Accuracy | ±1% over temperature and line/load - ensures stable supply for sensitive embedded processors and I/O rails. |
| Overcurrent Protection | Cycle-by-cycle limiting with programmable threshold (default 3.6A), frequency foldback, and hiccup mode - sustains reliability under short-circuit or overload. |
| Operating Temperature | –40°C to +105°C ambient - validated for under-hood automotive environments per AEC-Q100 Grade 2. |
Pinout & Package
ISL78201AVEZ-T is housed in a thermally enhanced 20-lead HTSSOP package (M20.173A) with exposed thermal pad (PAD, pin 21) requiring PCB ground plane connection for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1) | Power ground return | Low-impedance path for high-current switch node return; must be connected to power ground plane, not signal ground. |
| BOOT (2) | High-side gate driver bootstrap supply | Internally charged via integrated bootstrap circuit; requires 1µF ceramic capacitor to PHASE for reliable high-side N-MOSFET drive. |
| VIN (3,4) | Main input supply | Connects to drain of integrated high-side MOSFET and input to main LDO; rated 3V–40V with 44V absolute max. |
| SGND (5) | Signal ground reference | Return path for control circuitry (FB, COMP, MODE, etc.); must be separated from PGND and joined at single point. |
| VCC (6) | Main LDO output | 4.5V ±0.3V regulated supply for internal logic and drivers; requires ≥4.7µF ceramic decoupling to SGND. |
| AUXVCC (7) | Auxiliary LDO input / boost OVP sense | In buck mode: powers auxiliary LDO after startup to reduce IC dissipation; in boost mode: senses boost output via resistor divider for 0.8V trip point. |
| EN (8) | Enable control | Active-high logic input; IC enabled when >1.7V, disabled when <1.0V; floating = enabled. |
| FS (9) | Frequency set/sync input | Resistor-to-GND sets oscillator frequency; also accepts external sync clock (10% higher than local freq, >150ns pulse width). |
| SS (10) | Soft-start timing | Charged by internal 5µA current source; capacitor value sets soft-start duration (0→0.8V ramp); also used for hiccup mode recovery timing. |
| FB (11) | Feedback input | Inverting input of error amplifier referenced to 0.8V; sets output voltage via resistor divider; monitored for overvoltage events. |
| COMP (12) | Error amplifier output | Compensation node for voltage loop; connects RC network to FB for stability tuning. |
| ILIMIT (13) | Current limit programming | Resistor-to-GND sets peak current threshold (default 3.6A); enables design-specific OCP tuning for inductor and layout. |
| MODE (14) | Operation mode select | GND = forced PWM; floating/VCC = PFM; resistor-to-GND programs PFM/PWM transition current (e.g., 700mA default). |
| PGOOD (15) | Power-good open-drain output | Pulled low on EN deactivation, output OV/UV, or fault; requires external pull-up to VCC; 128-cycle delay on rising edge. |
| PHASE (16,17) | Switch node output | Connects to inductor; tied to source of internal high-side MOSFET; critical for layout low-inductance routing. |
| EXT_BOOST (18) | Boost mode enable / input monitor | Determines topology at POR: <200mV → buck; >200mV → boost; in boost mode, monitors input via resistor divider for 0.8V turn-off threshold. |
| SYNC (19) | Multi-IC synchronization | Accepts external clock or connects to other ISL78201 SYNC pins; auto-generates 180° phase shift in master-slave configuration. |
| LGATE (20) | Low-side gate driver output | Drives external N-MOSFET in synchronous buck or boost; must be pulled to GND via ≤5.1kΩ in buck to prevent noise turn-on. |
| PAD (21) | Thermal pad | Non-electrical exposed copper pad; must be soldered to large PCB ground plane for θJC = 3.5°C/W thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side MOSFET | rDS(ON) ≤140mΩ enables compact 2.5A buck solutions without external high-side switch. |
| Boost-buck topology support | Extends input range to 2.5V and maintains regulation when VIN drops below VOUT - essential for automotive cold-crank survival. |
| Programmable PFM/PWM boundary | Resistor on MODE pin sets transition current (e.g., 150kΩ → ~1A), optimizing efficiency across dynamic load profiles. |
| Hiccup-mode overcurrent protection | Second-tier current limit triggers extended soft-start cycle (5× duration), preventing thermal runaway during sustained shorts. |
| VCC switchover to AUXVCC | Reduces internal power dissipation by switching bias supply from main LDO to auxiliary LDO post-startup - lowers die temperature at full load. |
| AEC-Q100 Grade 2 qualification | Validated for –40°C to +105°C operation with robust ESD (2kV HBM), latch-up (100mA), and automotive reliability testing. |
Applications
| Automotive Cold-Cranking Supply | Embedded Processor Core Rail |
|---|---|
Use Scenario: Maintaining 5V/3.3V supply to engine control unit (ECU) during cranking when battery voltage dips to 3V–6V. IC Role / Device Role / Timing Role: ISL78201AVEZ-T operates in boost-buck mode to regulate output despite VIN < VOUT, using EXT_BOOST monitoring and hiccup OCP for reliability. Use Value: Ensures uninterrupted ECU operation during engine start, meeting ISO 16750-2 transient requirements. | Use Scenario: Powering ARM Cortex-A/M cores and DDR memory interfaces in ADAS domain controllers. IC Role / Device Role / Timing Role: ISL78201AVEZ-T delivers ±1% regulation at 2.5A with programmable 500kHz–2.2MHz switching to minimize noise coupling into high-speed digital signals. Use Value: Enables stable core voltage under dynamic load steps (0→2A in <1ms), reducing timing margin loss in real-time processing. |
| 24V Bus Pre-regulator | Start-Stop System Auxiliary Rail |
Use Scenario: Generating isolated 5V/12V intermediate bus from vehicle 24V system for infotainment and telematics modules. IC Role / Device Role / Timing Role: ISL78201AVEZ-T configured as synchronous buck with forced PWM mode ensures consistent efficiency (>90% at 2A) across wide 18V–32V input range. Use Value: Reduces heat generation vs. linear regulators, enabling smaller heatsinks in space-constrained head units. | Use Scenario: Providing always-on 3.3V rail for CAN transceivers and real-time clocks during engine-off periods in micro-hybrid vehicles. IC Role / Device Role / Timing Role: ISL78201AVEZ-T operates in PFM mode with 180µA quiescent current (AUXVCC tied to VOUT), minimizing standby power draw from 12V battery. Use Value: Extends battery life during prolonged stop phases while maintaining fast wake-up response (<100µs VOUT recovery). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL78206AVEZ-T | No boost-buck capability; no AUXVCC or EXT_BOOST pins; fixed PWM-only operation; same 20-lead HTSSOP package. | Limited to standard buck conversion; cannot support cold-crank or VIN < VOUT scenarios. | Select when only buck regulation is required and cost reduction is prioritized over topology flexibility. |
| LM5118QMHX/NOPB | Wider 3V–75V input range; external high-side MOSFET required; no integrated high-side FET; supports SEPIC/Cuk topologies. | Requires additional external components for 2.5A operation; lacks integrated boost-buck mode and VCC switchover. | Select when input voltage exceeds 40V or non-buck topologies (e.g., SEPIC) are needed, accepting higher BOM count. |
Compared with ISL78206AVEZ-T, the ISL78201AVEZ-T adds boost-buck operation and ultra-low quiescent current modes essential for automotive start-stop; versus LM5118QMHX/NOPB, it reduces component count and layout complexity via integrated high-side MOSFET and dual-LDO architecture.
Availability
ISL78201AVEZ-T is available at Aetrix Electronics and suitable for automotive cold-cranking systems, embedded processor core supplies, and 24V bus pre-regulators requiring stable component supply across extended temperature and high-reliability environments.
Supply support for ISL78201AVEZ-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT markets.
The ISL78201AVEZ-T belongs to Renesas' automotive-grade power management portfolio, designed specifically for robust DC/DC conversion in harsh vehicle environments including engine control, ADAS, and body electronics.
FAQ
What is the maximum input voltage rating for the ISL78201AVEZ-T?
The ISL78201AVEZ-T has an absolute maximum VIN rating of +44V, with recommended operating range of 3V to 40V in buck mode. In boost-buck mode, the effective minimum input is 2.5V, but the 40V upper limit still applies to prevent exceeding absolute maximum ratings during transients. The datasheet specifies that short voltage ringing spikes (within a few nanoseconds) may occur during switching, so design margins must ensure sustained VIN remains ≤40V.
How does the ISL78201AVEZ-T achieve ultra-low quiescent current in PFM mode?
The ISL78201AVEZ-T achieves 300µA quiescent current in PFM mode by disabling non-essential circuitry and reducing switching frequency under light loads. When AUXVCC is connected to VOUT (e.g., 5V output), the IC switches bias from the main LDO to the auxiliary LDO, further lowering internal power dissipation to 180µA - confirmed in Figure 13 of the FN8615 datasheet under 12V VIN and 5V VOUT conditions.
Can the ISL78201AVEZ-T operate with a prebiased output during startup?
Yes, the ISL78201AVEZ-T supports prebiased output startup, as verified in Figure 20 of the FN8615 datasheet. During prebiased start-up, the controller ramps the output from an existing voltage level without forcing reverse current through the inductor or causing output overshoot, making it suitable for hot-swap and redundant power supply applications where output capacitors retain charge.
What is the purpose of the EXT_BOOST pin on the ISL78201AVEZ-T?
The EXT_BOOST pin on the ISL78201AVEZ-T serves two roles: at power-on reset (POR), it determines topology - voltage <200mV configures buck mode, >200mV configures boost mode; in active boost mode, it monitors boost input voltage via a resistor divider and disables boost PWM when the sensed voltage exceeds 0.8V, providing input overvoltage protection for the boost stage.
Does the ISL78201AVEZ-T require an external bootstrap diode?
No, the ISL78201AVEZ-T integrates a complete bootstrap charging circuit and does not require an external bootstrap diode. The BOOT pin is internally refreshed using charge-pump circuitry, and only a 1µF ceramic capacitor between BOOT and PHASE is required - explicitly stated in the Functional Pin Description on page 2 of FN8615 Rev 2.00.
ISL78201AVEZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 38V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Both
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
ISL78201AVEZ-T FAQ
1.How can I place an order for ISL78201AVEZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78201AVEZ-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL78201AVEZ-T reliable?
The price and inventory of ISL78201AVEZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78201AVEZ-T is usually 5 days.
3.What payment methods are accepted for ISL78201AVEZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78201AVEZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78201AVEZ-T?
ISL78201AVEZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78201AVEZ-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL78201AVEZ-T?
For technical support, including ISL78201AVEZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78201AVEZ-T requirements.
6.How does Aetrix verify that ISL78201AVEZ-T is sourced from the original manufacturer or authorized distributors?
All ISL78201AVEZ-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL78201AVEZ-T meets industry standards.
7.What is the process for return or replacement of ISL78201AVEZ-T?
All ISL78201AVEZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL78201AVEZ-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL78201AVEZ-T part is unused and in its original packaging.
Return procedure for ISL78201AVEZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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