My Inquiry
My Account
Renesas ISL9237HRZ-TK
- Part No.:
- ISL9237HRZ-TK
- Manufacturer:
- Renesas
- Category:
- Battery Chargers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL9237HRZ-TK.pdf
- Description:
- IC BATT CHG LI-ION 1-3CELL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,660
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL9237HRZ-TK from Renesas (formerly Intersil) is a buck-boost narrow VDC battery charger IC for 1–3-cell Li-ion systems, featuring SMBus/I²C programmability, USB OTG reverse-buck operation, IMVP-8-compliant PSYS power monitoring, and dual current sensing (AMON/BMON). It delivers up to 1MHz switching, supports trickle charging of depleted batteries, and regulates stable system bus voltage in mobile and industrial portable devices.
For engineers reviewing the ISL9237HRZ-TK datasheet, ISL9237HRZ-TK pinout, ISL9237HRZ-TK application, or ISL9237HRZ-TK equivalent, key selection considerations include NVDC topology behavior, adapter/battery/system power path arbitration, OTG enable conditions (VBAT > 5.8V), PSYS analog output scaling, and dual-level adapter current limit programming via SMBus registers.
Technical Context
The ISL9237HRZ-TK implements R3™ modulator architecture for fast transient response and seamless DCM/CCM transitions. Its buck-boost converter operates across 3.2V–23.4V input and regulates VSYS from 2.4V to 13.824V with ±0.5% accuracy for 2-/3-cell configurations.
It integrates dual current-sense amplifiers (AMON for adapter, BMON for battery discharge), PROCHOT# generation for adapter overcurrent (2688 mA/1024 mA thresholds) and battery over-discharge (4096 mA/3072 mA), and dedicated gate drivers (UGATE1/LGATE1/UGATE2/LGATE2) supporting external N-channel MOSFETs in a 4-switch topology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck-boost NVDC charger with 4-switch synchronous rectification |
| Input Voltage Range | 3.2V to 23.4V - enables direct use with USB PD, travel adapters, and legacy DC sources without dead zones |
| System Output Range | 2.4V to 13.824V - supports 1-, 2-, or 3-cell Li-ion battery systems with tight regulation |
| Switching Frequency | Up to 1MHz - allows compact LC filter design with reduced inductor size and improved transient response |
| PSYS Output | IMVP-8-compliant analog current source - provides real-time platform power consumption signal to core regulators |
| USB OTG Support | Reverse buck mode delivering regulated 5V at USB port - enabled only when battery ≥5.8V and OTGEN pin high |
| Current Monitoring | Dual independent amplifiers: AMON (adapter) and BMON (battery discharge), both with 17.9x gain and <±5% error at mid-scale |
| Package | 32-lead 4×4 mm QFN - thermally enhanced with exposed thermal pad (θJC = 3.5°C/W) |
Pinout & Package
ISL9237HRZ-TK uses a 32-lead 4×4 mm QFN package with exposed thermal pad (PKG DWG L32.4x4A). Pin functions are validated per FN8723 Rev.5.00 datasheet, Page 3–5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Bottom Pad) | Signal and thermal reference | Primary ground return and mandatory thermal dissipation path; must be soldered to PCB copper pour |
| VSYS | System output voltage feedback | Connects to system rail for MaxSystemVoltage regulation; sets narrow DC bus target |
| VBAT | Battery voltage sense | Enables trickle charge detection, ideal diode control, and OTG enable logic (VBAT > 5.8V required) |
| CSOP/CSON | Battery current sense differential inputs | Measure battery discharge current with 17.95× gain; used for DCProchot# and BMON output |
| CSIP/CSIN | Adapter current sense differential inputs | Measure adapter input current with 17.91× gain; used for ACProchot# and AMON output |
| UGATE1/LGATE1/UGATE2/LGATE2 | Gate drive outputs | Drive external N-MOSFETs Q1–Q4 in 4-switch buck-boost configuration; support 1MHz operation |
| BOOT1/BOOT2 | High-side gate driver bootstrap supplies | Require MLCC between BOOTx and PHASEx; internally charged via VDDP diode during low-side conduction |
| SCL/SDA | SMBus/I²C interface | Enable full register-based configuration: adapter/charge current limits, system voltage, PROCHOT# thresholds, OTG settings |
| PROCHOT# | Open-drain thermal/power fault indicator | Asserted low on adapter overcurrent, battery over-discharge, or low VSYS; IMVP-8 compliant timing |
| PSYS | Platform power monitor output | Current-source output proportional to total system power; connects directly to IMVP-8 core regulator feedback |
| OTGEN/CMIN | OTG enable or comparator input | Pulled high to activate OTG; requires valid battery voltage and SMBus OTG mode command |
| OTGPG/CMOUT | OTG power-good or comparator output | Open-drain indicator: low if OTG 5V output is out-of-regulation window |
| BGATE | Battery disconnect FET gate driver | Drives P-channel FET to isolate battery; supports linear-mode trickle charge current regulation |
| ASGATE | Adapter-side ideal diode FET gate driver | Optional P-FET control for adapter input path; clamped to ADP −10V when active |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Modulator Architecture | Delivers high light-load efficiency and seamless DCM/CCM transitions without audible noise or instability |
| NVDC System Regulation | Maintains stable VSYS regardless of adapter/battery presence - powers system from adapter, battery, or both simultaneously |
| Programmable Dual-Level Adapter Current Limit | Two SMBus-configurable current thresholds (e.g., 1024 mA / 2688 mA) with user-defined duration for surge tolerance |
| Trickle Charging with Hysteresis Control | Supports 128/256/512 mA modes; automatic transition to fast charge when BGATE voltage exceeds 1.7 V ±92 mV |
| Integrated Power Path Management | Automatically selects optimal power source (adapter, battery, or hybrid) based on real-time voltage/current conditions |
| IMVP-8 Compliance | Includes PSYS analog output and PROCHOT# signaling compatible with Intel core voltage regulators for laptop platforms |
Applications
| Ultrabook Power Management | Industrial Portable Terminal |
|---|---|
Use Scenario: High-efficiency battery charging and system power delivery in fanless ultrabooks with USB-C PD input and dual-cell Li-ion packs. IC Role / Device Role / Timing Role: Primary NVDC charger managing adapter-to-battery charging, battery-to-system power, and reverse OTG supply - all under IMVP-8 platform coordination. Use Value: Enables single-rail system bus (VSYS) stability across input source changes, eliminates need for separate PMIC sequencing, and reduces BOM count by integrating PSYS/PROCHOT#/OTG. | Use Scenario: Rugged handheld terminal requiring reliable battery backup, field-replaceable battery, and USB host capability for peripheral attachment. IC Role / Device Role / Timing Role: Central power arbiter providing seamless switchover between wall adapter and 3-cell battery, plus on-demand 5V OTG supply for barcode scanners or printers. Use Value: Guarantees uninterrupted operation during hot-swap battery replacement and delivers regulated 5V OTG power only when battery state permits - preventing brownout or unsafe discharge. |
| Medical Point-of-Care Device | Mobile POS Terminal |
Use Scenario: Battery-powered diagnostic instrument needing precise charge termination, low-power trickle recovery, and accurate platform power telemetry. IC Role / Device Role / Timing Role: Battery charger and system power supervisor with calibrated AMON/BMON current sensing and PSYS analog reporting for energy usage analytics. Use Value: Provides ±0.5% system voltage regulation and <±5% current measurement accuracy - critical for FDA-compliant battery runtime prediction and safety-critical power logging. | Use Scenario: Compact wireless payment terminal using USB-C for charging and data, with dual-cell battery and embedded printer requiring burst 5V loads. IC Role / Device Role / Timing Role: Buck-boost charger enabling USB PD input compatibility, while OTG function powers printer peripherals without draining main battery during transactions. Use Value: Eliminates need for discrete 5V boost converter; leverages same power stage for charge and OTG, reducing solution size and thermal footprint by 35% vs. dual-IC approach. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL9238 | Successor device with enhanced thermal performance, extended junction temperature rating (−10°C to +135°C), and updated SMBus command set; pin-compatible but not drop-in due to revised PROCHOT# timing and PSYS scaling. | Targeted for new designs requiring higher ambient operating temperature or tighter IMVP-8 compliance margins; not suitable for legacy ISL9237 firmware without register mapping updates. | Select ISL9238 only when redesigning for improved thermal headroom or long-term availability; existing ISL9237HRZ-TK designs should retain original part. |
| BQ25790RTWR | TI buck-boost charger with integrated ADC, fuel gauge interface, and I²C-only communication; lacks native PSYS output and IMVP-8 PROCHOT# timing - requires external logic for platform power coordination. | Preferred for cost-sensitive consumer electronics where IMVP-8 compliance is unnecessary and integrated telemetry (voltage/current/temp) is prioritized over analog PSYS integration. | Choose BQ25790RTWR when migrating from proprietary SMBus platforms to TI's battery management ecosystem; avoid if PSYS analog interface or IMVP-8 timing is required. |
Compared with ISL9237HRZ-TK, ISL9238 offers higher thermal robustness and updated register definitions but requires firmware adaptation, while BQ25790RTWR trades PSYS/PROCHOT# compatibility for richer telemetry and lower BOM cost - making ISL9237HRZ-TK optimal for IMVP-8 laptop derivatives and industrial platforms needing analog power monitoring.
Availability
ISL9237HRZ-TK is available at Aetrix Electronics and suitable for ultrabook power management, industrial portable terminals, and medical point-of-care devices requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9237HRZ-TK 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 Corporation acquired Intersil in 2017 and maintains its high-performance analog and power management portfolio for computing, industrial, and automotive markets.
The ISL9237HRZ-TK belongs to Renesas' battery charger IC product line, designed specifically for NVDC architectures in space-constrained portable systems requiring intelligent power path arbitration, USB OTG capability, and IMVP-8 platform integration.
FAQ
What is the maximum supported battery configuration for the ISL9237HRZ-TK?
The ISL9237HRZ-TK supports 1-, 2-, or 3-cell Li-ion battery packs in series, configured via the PROG pin resistor or SMBus register. It regulates system voltage (VSYS) across the full range of 2.4V to 13.824V, with ±0.5% accuracy for 2- and 3-cell setups. The device monitors battery voltage at the VBAT pin and enforces UVLO (2.45V typical) and OTG-enable thresholds (5.95V typical) to ensure safe operation across all configurations. ISL9237HRZ-TK does not support 4-cell or higher stacks.
Does the ISL9237HRZ-TK require external MOSFETs, and what type are supported?
Yes, the ISL9237HRZ-TK requires four external N-channel MOSFETs (Q1–Q4) for its 4-switch buck-boost topology. Gate drivers UGATE1/LGATE1/UGATE2/LGATE2 provide independent control, with BOOT1/BOOT2 supporting high-side drive. The IC also supports optional P-channel FETs via ASGATE (adapter side) and BGATE (battery side); BGATE operates in linear mode during trickle charge. ISL9237HRZ-TK does not integrate any power switches.
How does the ISL9237HRZ-TK implement USB OTG functionality?
The ISL9237HRZ-TK enables USB OTG by reversing its buck-boost power stage into a synchronous buck converter, delivering regulated 5V at the USB port. Activation requires three simultaneous conditions: OTGEN pin pulled high, SMBus OTG mode register set, and VBAT ≥5.95V (typical). The OTGPG pin signals power-good status, and the device disables OTG if VSYS drops below regulation or battery voltage falls below threshold. ISL9237HRZ-TK does not support USB-C PD negotiation - OTG is strictly 5V fixed output.
What is the role of the PSYS pin on the ISL9237HRZ-TK, and how is it scaled?
The PSYS pin on the ISL9237HRZ-TK is an IMVP-8-compliant current-source output representing total platform power consumption. Its output current scales linearly with system load: 1mA corresponds to ~1W of platform power, referenced to the internal VDD rail. It connects directly to the IMVP-8 core regulator's PSYS input for dynamic voltage/frequency scaling. PSYS remains active during all operating modes (charge, discharge, OTG) and is unaffected by SMBus disable commands. ISL9237HRZ-TK does not provide digital PSYS reporting - only analog current output.
Can the ISL9237HRZ-TK operate without an SMBus host controller?
Yes, the ISL9237HRZ-TK can operate in standalone mode using default configurations set by the PROG pin resistor (cell count, switching frequency, adapter current limit). All critical functions - charging, system regulation, OTG enable, PROCHOT#, and PSYS - remain active without SMBus communication. However, dynamic reconfiguration (e.g., changing charge current, system voltage, or PROCHOT# thresholds) requires SMBus/I²C access. ISL9237HRZ-TK defaults to 2-cell mode, 733kHz switching, and 0.476A adapter limit when SDA/SCL are unconnected or held high.
ISL9237HRZ-TK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1 ~ 3
- Current - Charging:
- -
- Programmable Features:
- -
- Fault Protection:
- Over Current, Over Temperature, Over Voltage
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 23.4V
- Interface:
- I2C, USB
- Operating Temperature:
- -10°C ~ 100°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (4x4)
ISL9237HRZ-TK FAQ
1.How can I place an order for ISL9237HRZ-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9237HRZ-TK 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 ISL9237HRZ-TK reliable?
The price and inventory of ISL9237HRZ-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9237HRZ-TK is usually 5 days.
3.What payment methods are accepted for ISL9237HRZ-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9237HRZ-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9237HRZ-TK?
ISL9237HRZ-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9237HRZ-TK 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 ISL9237HRZ-TK?
For technical support, including ISL9237HRZ-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9237HRZ-TK requirements.
6.How does Aetrix verify that ISL9237HRZ-TK is sourced from the original manufacturer or authorized distributors?
All ISL9237HRZ-TK 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 ISL9237HRZ-TK meets industry standards.
7.What is the process for return or replacement of ISL9237HRZ-TK?
All ISL9237HRZ-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL9237HRZ-TK, 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 ISL9237HRZ-TK part is unused and in its original packaging.
Return procedure for ISL9237HRZ-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL9237HRZ-TK Tags
-
BQ21040DBVR
Texas Instruments
-
MCP73812T-420I/OT
Microchip Technology
-
MCP73831T-2ACI/OT
Microchip Technology
-
MCP73832T-2ACI/OT
Microchip Technology
-
MCP73831T-2DCI/OT
Microchip Technology
-
MCP73832T-2DCI/OT
Microchip Technology
-
MCP73831T-2ATI/OT
Microchip Technology
-
MCP73832T-2ATI/OT
Microchip Technology
-
MCP73831T-5ACI/OT
Microchip Technology
-
MCP73832T-2ACI/MC
Microchip Technology
-
MCP73831T-2ACI/MC
Microchip Technology
-
MCP73831T-2ATI/MC
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
