TPS23521 - -10V to -80V Hot Swap Controller | Texas Instruments
MPN: TPS23521 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.85 | $6.85 |
| 10 | $6.16 | $61.60 |
| 100 | $5.65 | $565.00 |
| 500 | $5.09 | $2,545.00 |
| 1,000 | $4.6 | $4,600.00 |
Drop-in alternatives for TPS23521 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS2393
⚡ Same Package✓ In Stock
$1.83 / Unit
View Datasheet →TPS2394
⚡ Same Package📋 Reference alternative (not in catalog)
TPS2398
⚡ Same Package📋 Reference alternative (not in catalog)
TPS23521 Maximum Ratings & Electrical Characteristics
| Function | Hot Swap Controller |
| Number of Channels | 1 |
| Input Voltage Range | -10 V to -80 V |
| Absolute Maximum Rating | 200 V |
| Current Limit | Dual current limit |
| Gate Drive | Dual gate drive |
| Soft Start | Soft start cap disconnect |
| Supply Voltage Nominal | -48 V |
| Package | 16-TSSOP (PW) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C |
| Applications | Network Routers and Switches |
| Surge Robustness | IEC61000-4-5 lightning surge tests |
| RoHS Status | Compliant |
| MSL Level | [DATA_NEEDED: MSL level] |
| Quiescent Current | [DATA_NEEDED: quiescent current] |
TPS23521 Pin Configuration
| Pin 1 | [DATA_NEEDED: pin 1 name] — Per TI datasheet pin configuration |
| Pin 2 | [DATA_NEEDED: pin 2 name] — Per TI datasheet pin configuration |
| Pin 3 | [DATA_NEEDED: pin 3 name] — Per TI datasheet pin configuration |
| Pin 8 | [DATA_NEEDED: pin 8 name] — Per TI datasheet pin configuration |
| Pin 9 | [DATA_NEEDED: pin 9 name] — Per TI datasheet pin configuration |
| Pin 16 | [DATA_NEEDED: pin 16 name] — Per TI datasheet pin configuration |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TPS23521 is suitable for 6 applications: Network Router -48V Power Distribution, Telecom Ethernet Switches, Base Station Power Distribution, Telecom Rectifier Systems, High-Availability Server Power, Industrial -48V Control Systems.
Network Router -48V Power Distribution
The TPS23521 fits network routers powered from -48V telecom battery plants, where boards must be inserted and removed from live backplanes without glitching the shared bus. Its -10V to -80V input range covers normal battery float to deep-discharge conditions, and the 200V absolute maximum rating helps the design pass IEC61000-4-5 lightning surge tests. Dual gate drive controls two external MOSFETs, distributing high load current while dual current limit protects each path. Placed between the backplane feed and the card's DC-DC inputs, it limits inrush during hot insertion.
Recommended
Telecom Ethernet Switches
Enterprise and carrier Ethernet switches commonly use -48V power shelves; the TPS23521 provides controlled hot swap for each switch card, keeping the shared bus stable during card insertion. Its soft start cap disconnect feature enables a smooth power-up ramp and then removes the soft start capacitor from the control loop, improving transient response when downstream loads step. Dual current limit allows design margin above nominal load while still clamping fault currents rapidly, protecting connector contacts and the external MOSFET from overcurrent stress in high-port-density switching platforms.
Recommended
Base Station Power Distribution
Wireless base station line cards draw high, pulsed power from -48V feeds and must survive outdoor lightning-induced transients. The TPS23521's 200V absolute maximum rating and IEC61000-4-5 robustness reduce the external suppression component count, while dual gate drive lets engineers parallel MOSFETs for currents up to several hundred amps. Operating from -40C to +85C, the controller suits outdoor cabinets with wide ambient swings. Proper PCB layout with low-inductance MOSFET gate loops and Kelvin-sensed current paths preserves the controller's fast overcurrent response under fault conditions.
Recommended
Telecom Rectifier Systems
Telecom rectifier modules plug into -48V distribution shelves, and the TPS23521 provides the hot swap interface limiting inrush when a rectifier is inserted into a live bus. Its precise current sensing supports fast overcurrent shutdown, and the soft start function prevents large inrush currents from disturbing other modules sharing the shelf. The dual MOSFET control improves reliability in redundant configurations. Designers should size the soft start capacitor so inrush stays within the pass MOSFET's safe operating area, and provide thermal margin on the MOSFETs during extended fault clearing intervals.
Recommended
High-Availability Server Power
High-availability servers and compute shelves that adopt -48V distributed power (common in datacenter colocation following telecom practice) benefit from the TPS23521's controlled hot swap at the card edge. Dual current limit and fast fault response protect against shorted loads during live insertion, and the wide -10V to -80V input tolerates battery plant variation. Because availability is paramount, the dual gate drive supports MOSFET redundancy, keeping the load connected even if one pass device degrades. Place the controller close to the connector with short, wide current-sense traces to minimize sensing error.
Recommended
Industrial -48V Control Systems
Industrial systems that use -48V battery-backed supplies, such as plant telephony gateways and process-control cabinets, can apply the TPS23521 for field-replaceable module hot swap. Its -40C to +85C range and RoHS compliance support industrial builds, while the 200V absolute maximum rating adds robustness against wiring-induced transients common in industrial cabling. The dual current limit lets designers implement both a fast fault threshold and a slower overload threshold, discriminating between genuine shorts and benign inrush from large downstream capacitor banks during module replacement.
Recommended
Recommended Products Summary
Engineering reference data for TPS23521 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS2393 | TPS2394 | TPS2398 |
|---|---|---|---|---|
| Package | 16-TSSOP (PW) | TSSOP-16 (PW) | TSSOP-16 (PW) | TSSOP-16 (PW) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | -10 V to -80 V | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Absolute Maximum Rating | 200 V | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Current Limit | Dual current limit | Single path | [DATA_NEEDED] | [DATA_NEEDED] |
| Gate Drive | Dual gate drive | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Soft Start | Soft start cap disconnect | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Pin-to-Pin Compatible | Reference | No - verify pinout | No - verify pinout | No - verify pinout |
Key Differentiators
- 200V absolute maximum rating for surge survivability (vs TPS2393)
- Dual current limit and dual gate drive (vs TPS2394)
- Soft start cap disconnect (vs TPS2398)
Design Notes
Route high-current paths for the external MOSFETs with wide, short copper pours and place the current sense resistor with Kelvin connections directly at the sense pins to preserve current limit accuracy. Keep gate drive loops small to reduce ringing, and place the soft start capacitor close to its dedicated pin with a solid ground return for noise immunity.
Size the soft start capacitor so the inrush current stays within the external pass MOSFET safe operating area during the full startup interval; an undersized capacitor can still trip the current limit or overheat the MOSFET. Remember the soft start capacitor is disconnected during normal operation, so transient response after startup is not degraded by the soft start network.
The TPS23521 itself dissipates little power, but the external pass MOSFETs bear the full load conduction loss. Provide adequate copper area or heatsinking for the MOSFETs, especially during current-limit events where the device holds the MOSFET in its linear region; verify MOSFET junction temperature during worst-case fault clearing at maximum ambient (85C).
The 200V absolute maximum rating provides margin for IEC61000-4-5 lightning surge on -48V telecom buses, but upstream varistors or TVS diodes are still recommended in severe exposure environments to protect the external MOSFETs, which may have lower voltage ratings than the controller.
Compliance Information
RoHS compliant per internal database description. Other compliance attributes not found in verified data.
