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STMicroelectronics L5988DTR
- Part No.:
- L5988DTR
- Manufacturer:
- STMicroelectronics
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
L5988DTR.pdf
- Description:
- IC REG BUCK ADJ 4A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:697
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Product details
Overview
L5988DTR from STMicroelectronics is a monolithic synchronous step-down DC-DC switching regulator delivering 4 A continuous output current (5 A pulsed), operating from 2.9 V to 18 V input, with programmable 100–1000 kHz switching frequency, 0.6 V to VIN adjustable output voltage, and integrated high-side PMOS/low-side NMOS power switches in HTSSOP16 package. It enables compact, high-efficiency point-of-load conversion in space-constrained consumer and industrial power supplies.
For engineers reviewing the L5988DTR datasheet, L5988DTR pinout, L5988DTR application, or L5988DTR equivalent, key selection criteria include its 200 ns minimum on-time, voltage-mode control architecture, multifunction U/O/S pin for UVLO/OVP/sink configuration, MLCC-compatible design, and pre-bias startup capability - all critical for stable low-VOUT, high-dV/dt, or multi-rail sequencing applications.
Technical Context
The L5988DTR implements a voltage-mode PWM controller with feed-forward compensation, using an internal sawtooth oscillator synchronized to external clock signals via SYNCH pin. Its error amplifier drives the PWM comparator directly, eliminating current-sense dependency and enabling stable operation at extreme duty cycles (including 100% duty cycle).
It integrates BCD6-process PMOS (75–132 mΩ) and NMOS (62–106 mΩ) power switches, supports zero-load quiescent current operation (35 µA standby), and features dual-switch current limiting with externally adjustable thresholds via ILIM-ADJ pin - ensuring robust protection across wide VIN/VOUT combinations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 4 A continuous (5 A pulsed); enables single-chip replacement of discrete buck controllers + MOSFETs in mid-power rails. |
| Input voltage range | 2.9 V to 18 V; supports direct connection to 3.3 V, 5 V, and 12 V bus systems without pre-regulation. |
| Switching frequency | 100 kHz to 1 MHz (resistor-programmable or external sync); allows optimization of size vs. efficiency trade-offs. |
| Min. on-time | 200 ns; supports high step-down ratios (e.g., 12 V → 1.2 V at 400 kHz) without pulse-skipping instability. |
| Reference voltage | 1.8 V ±2% (VREF pin); provides precise, temperature-stable bias for feedback divider and UVLO/OVP thresholds. |
| Feedback threshold | 0.6 V ±0.5%; enables accurate regulation down to sub-1 V outputs with standard resistor dividers. |
| Thermal resistance | RthJA = 40 °C/W (HTSSOP16 on demo board); supports 4 A continuous load at ≤60 °C ambient without forced airflow. |
Pinout & Package
HTSSOP16 package with exposed thermal pad (package code: TSSOP16), 0.65 mm pitch, 5.0 × 4.4 mm body, optimized for PCB thermal dissipation and high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 OUT | Power output node | Connects directly to LC filter output; carries full 4 A switched current; requires low-inductance routing to PGND. |
| 2, 3 VIN | Main power input | Accepts 2.9–18 V unregulated input; decoupling capacitor must be placed adjacent to these pins. |
| 4 VCC | Bias supply input | Provides internal circuitry power; bypassed separately to SGND; not tied to VIN in low-VIN operation. |
| 5 SS/INH | Soft-start / inhibit control | Active-low enable; floating = soft-start mode (22 µA constant-current charge); pulled low = shutdown. |
| 6 COMP | Error amplifier output | Drives external Type II/III compensation network; high-impedance node requiring careful layout. |
| 7 ILIM-ADJ | Current limit programming | Resistor-to-VREF or GND sets matched high/low-side current thresholds (3.6–4.4 A HS / 4.14–5.06 A LS). |
| 8 FB | Feedback input | Senses regulated output via resistive divider; 0.6 V reference enables precision VOUT setting. |
| 9 SYNCH | Sync master/slave I/O | Accepts external clock (70 ns min pulse width) or outputs synchronized signal (100 ns pulse width). |
| 10 FSW | Frequency adjust | Pull-up/down resistor selects fSW from 100–1000 kHz; floating = 400 kHz ±10% default. |
| 11 U/O/S | Multifunction configuration | Voltage level selects UVLO bus (3.3/5/12 V), OVP latch mode, and sink capability enable/disable. |
| 12 VREF | 1.8 V reference output | Stable, buffered reference used for UVLO, OVP, and external resistor programming (ILIM-ADJ, FSW). |
| 13 SGND | Signal ground | Analog ground return for FB, COMP, VREF, and control pins; separated from PGND to minimize noise coupling. |
| 14, 15 PGND | Power ground | High-current return path for both MOSFETs and input/output capacitors; connected to exposed thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enabled by integrated high-side PMOS switch - eliminates need for external bootstrap capacitor and supports VIN ≈ VOUT. |
| Pre-bias startup | Sink capability disabled during soft-start; prevents reverse current flow into pre-charged output rail. |
| Voltage feed-forward control | Compensates for input voltage variations in real time, improving transient response and loop stability. |
| MLCC-compatible design | No minimum ESR requirement on output capacitor - enables use of small, low-profile ceramic capacitors. |
| Programmable UVLO thresholds | Three selectable input bus levels (3.3 V, 5 V, 12 V) with hysteresis - ensures clean power-up sequencing. |
| Hiccup-mode overcurrent protection | Auto-retry shutdown after current-limit fault - protects against sustained overload without latching. |
Applications
| Consumer Audio Power Rail | Industrial DC-DC Module |
|---|---|
|
Use Scenario: Powering DSP, ADC, and audio codec ICs in car radio head units requiring clean 1.2 V, 1.8 V, or 3.3 V rails from 12 V battery. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise intermediate voltage with fast load transient response. Use Value: 200 ns minimum on-time and voltage-mode control ensure stable 12 V → 1.2 V conversion at 600 kHz, minimizing filter size while maintaining <±1% load regulation. |
Use Scenario: Embedded 5 V to 3.3 V or 2.5 V conversion in factory automation I/O modules with strict thermal constraints and no airflow. IC Role / Device Role / Timing Role: Standalone step-down regulator replacing discrete controller + dual-MOSFET solutions in sealed enclosures. Use Value: HTSSOP16 exposed pad and 40 °C/W RthJA allow 4 A continuous delivery at 60 °C ambient; zero-load operation extends battery life in sleep modes. |
| Networking Router PoL Supply | HC LED Driver Bias Supply |
|
Use Scenario: Point-of-load conversion for FPGA core voltage (e.g., 12 V → 1.0 V @ 3 A) in DSL modem or enterprise router line cards. IC Role / Device Role / Timing Role: High-efficiency, sync-capable buck regulator supporting dynamic frequency scaling and multi-phase coordination. Use Value: SYNCH pin enables interleaved operation with other L5988DTRs to reduce input RMS current ripple and EMI; 400 kHz default frequency balances efficiency and component size. |
Use Scenario: Constant-voltage bias supply for high-current LED strings in architectural lighting drivers where dimming requires stable low-VOUT rails. IC Role / Device Role / Timing Role: Precision-adjustable buck regulator supplying LED driver IC reference and gate drive rails. Use Value: 0.6 V feedback reference and 1.8 V VREF enable accurate, temperature-stable output setting; programmable current limit protects against LED short-circuit faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z (Monolithic Power) | 3 A continuous, 2.5–16 V input, fixed 500 kHz fSW, no sync or multifunction pin; smaller TSOT23-8 package. | Lacks UVLO/OVP configuration, soft-start programmability, and 100% duty cycle - unsuitable for pre-biased or wide-VIN bus-matching designs. | Select when board space is critical and only basic 3 A regulation is needed; avoid for automotive or industrial sequencing requirements. |
| TPS54331DR (Texas Instruments) | 3 A continuous, 3.5–28 V input, 570 kHz fixed fSW, external compensation, no VREF output or multifunction pin. | Requires external bootstrap capacitor; no 100% duty cycle; lacks integrated VREF for resistor programming - increases BOM count. | Choose for legacy TI ecosystem compatibility or higher VIN (>18 V) needs; not recommended for 2.9 V start-up or compact MLCC-only designs. |
Compared with MP2315DJ-LF-Z and TPS54331DR, the L5988DTR uniquely combines 4 A capability, 2.9 V start-up, 100% duty cycle, programmable protections, and integrated 1.8 V reference - making it the only option among the three qualified for 3.3 V bus-matched, pre-biased, thermally constrained, or multi-feature-configurable buck applications.
Availability
L5988DTR is available at Aetrix Electronics and suitable for consumer audio power rails, industrial DC-DC modules, and networking router point-of-load supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for L5988DTR 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
STMicroelectronics is a global semiconductor leader specializing in power management, microcontrollers, and analog ICs, with manufacturing and R&D operations across Europe, Asia, and the Americas.
The L5988DTR belongs to ST's high-current monolithic DC-DC regulator product line, designed specifically for space-constrained, thermally demanding applications in consumer, industrial, and networking equipment where integration, reliability, and feature flexibility are critical.
FAQ
What is the minimum input voltage required for the L5988DTR to start switching?
The L5988DTR begins switching when the input voltage on VIN reaches the UVLO turn-on threshold - 2.7 V for 3.3 V bus configuration, 8 V for 12 V bus configuration - as set by the U/O/S pin voltage. Below this threshold, the device remains in shutdown regardless of SS/INH state. The absolute minimum operating VIN is 2.9 V per datasheet specifications, ensuring stable regulation once enabled.
Can the L5988DTR operate with 100% duty cycle, and under what conditions?
Yes, the L5988DTR supports true 100% duty cycle operation due to its integrated high-side PMOS switch, which eliminates the need for an external bootstrap capacitor. This occurs automatically when the required output voltage approaches the input voltage (e.g., VIN = 3.6 V, VOUT = 3.3 V), provided the internal error amplifier drives the PWM comparator to maximum on-time without oscillation or dropout.
How is the current limit threshold adjusted on the L5988DTR?
The current limit threshold is adjusted using an external resistor connected to the ILIM-ADJ pin: pulling up to VREF increases both high-side and low-side current limits proportionally, while pulling down to GND decreases them. Default thresholds (4 A HS / 4.6 A LS) apply when ILIM-ADJ is left floating. Resistor values are selected from Table 9 in the datasheet to match specific application current margins.
Does the L5988DTR require an external bootstrap capacitor?
No, the L5988DTR does not require an external bootstrap capacitor because it uses an integrated high-side PMOS transistor instead of an NMOS. The PMOS gate is driven directly from the internal VCC rail, enabling reliable 100% duty cycle operation and simplifying PCB layout - a key differentiator from NMOS-based synchronous buck regulators like the TPS54331DR.
L5988DTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 4A
- Frequency - Switching:
- 100kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
L5988DTR FAQ
1.How can I place an order for L5988DTR through Aetrix?
Please submit a Request for Quotation (RFQ) for L5988DTR 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 L5988DTR reliable?
The price and inventory of L5988DTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L5988DTR is usually 5 days.
3.What payment methods are accepted for L5988DTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L5988DTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L5988DTR?
L5988DTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L5988DTR 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 L5988DTR?
For technical support, including L5988DTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L5988DTR requirements.
6.How does Aetrix verify that L5988DTR is sourced from the original manufacturer or authorized distributors?
All L5988DTR 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 L5988DTR meets industry standards.
7.What is the process for return or replacement of L5988DTR?
All L5988DTR units undergo pre-shipment inspection (PSI). If there is an issue with L5988DTR, 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 L5988DTR part is unused and in its original packaging.
Return procedure for L5988DTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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