SC2442UA
Dual Synchronous Buck ControllerThe SC2442UA is a dual synchronous buck controller from Semiment. View the full SC2442UA datasheet below including key specifications, pinout, electrical characteristics, absolute maximum ratings.
SC2442UA shares its datasheet with SC2442, whose page lists every part number it covers.
Official SC2442UA datasheet (PDF) — the source this page was extracted from.
SC2442UA Key Specifications
| Parameter | Value |
|---|---|
| Undervoltage Lockout Start Threshold (AVCC rising) | 4.5 V (min), 4.6 V (typ), 4.75 V (max) |
| AVCC/PVCC Regulated Voltage | 6.7 V (min), 7 V (typ), 7.3 V (max) |
| Voltage Feedback Reference (VFB1, VFB2) | 0.735 V (min), 0.750 V (typ), 0.765 V (max) |
| Oscillator Frequency Range | 0.1 MHz (min), 1 MHz (max) |
| OC1, OC2 Current Limit Sense | -80 mV (min), -105 mV (typ), -125 mV (max) |
| High Side Gate Drive Source/Sink Current | 0.5 A (typ) |
| Low Side Gate Drive Source/Sink Current | 0.5 A (typ) |
| Maximum Duty Cycle | 85 % (min), 94 % (typ) |
SC2442UA Overview
Part: SC2442/H — Semtech Corporation
Type: Dual Synchronous Buck Controller
Description: High performance dual buck converter controller that can be configured for synchronous buck applications, operating out of phase for reduced input ripple, with a wide input range of 4.5 to 30V for SC2442 and 4.5 to 36V for SC2442H, and programmable clock frequency up to 1 MHz.
Operating Conditions:
- Supply voltage: 4.5–30V (SC2442), 4.5–36V (SC2442H)
- Operating temperature: -40 to +125 °C
- Clock frequency: 0.1 to 1 MHz
Absolute Maximum Ratings:
- Max BST1, BST2 to PGND voltage: 38 V (SC2442), 44 V (SC2442H)
- Max PVCC, AVCC to PGND voltage: 8 V
- Max junction temperature: +125 °C
- Max storage temperature: +150 °C
Key Specs:
- Undervoltage Lockout Start Threshold (AVCC rising): 4.5 V (min), 4.6 V (typ), 4.75 V (max)
- AVCC/PVCC Regulated Voltage: 6.7 V (min), 7 V (typ), 7.3 V (max)
- Voltage Feedback Reference (VFB1, VFB2): 0.735 V (min), 0.750 V (typ), 0.765 V (max)
- Oscillator Frequency Range: 0.1 MHz (min), 1 MHz (max)
- OC1, OC2 Current Limit Sense: -80 mV (min), -105 mV (typ), -125 mV (max)
- High Side Gate Drive Source/Sink Current: 0.5 A (typ)
- Low Side Gate Drive Source/Sink Current: 0.5 A (typ)
- Maximum Duty Cycle: 85 % (min), 94 % (typ)
Features:
- Dual output controller
- Asynchronous start up mode
- Power up sequencing to prevent latch-ups
- Out of phase operation for low input ripple
- Over current protection
- Output down to 0.75V
- Vcc regulator with external PNP transistor
- Programmable clock frequency up to 1MHz
- Two synchronous bucks for high efficiency at high current
Applications:
- Point of load converter applications
- DSL applications with multiple output voltages
- Power management for mixed signal applications
- Cable modems and set top boxes
Package:
- TSSOP-24
SC2442UA Features
- u Dual output controller
- u Asynchronous start up mode
- u Power up sequencing to prevent latch-ups
- u Out of phase operation for low input ripple
- u Over current protection
- u Output down to 0.75V
- u Wide input range, 4.5 to 30V for SC2442 and 4.5 to 36V for SC2442H
- u Vcc regulator with external PNP transistor
- u Programmable clock frequency up to 1MHz
- u Two synchronous bucks for high efficiency at high current
- u -40 to +125 Deg C operating temperature
- u Small package TSSOP-24
SC2442UA Applications
- u Point of load converter applications
- u DSL applications with multiple output voltages
- u Power management for mixed signal applications
- u Cable modems and set top boxes.
SC2442UA Pin Configuration
SC2442UA Pinout
Package: TSSOP-24
| Pin Number | Pin Name | Type | Description |
|---|---|---|---|
| 1 | AVCC | P | Analog Supply Voltage |
| 2 | BDI | I | Bootstrap Diode Input |
| 3 | VIN | I | Input Voltage |
| 4 | OC1 | O | Over-Current Detection 1 |
| 5 | EA1 | I | Error Amplifier Input 1 |
| 6 | FB1 | I | Feedback Input 1 |
| 7 | SS1 | I | Soft Start 1 |
| 8 | BST1 | P | Bootstrap Supply 1 |
| 9 | GD1H | O | Gate Driver Output 1 High |
| 10 | PH1 | I/O | Phase Node 1 |
| 11 | GD1L | O | Gate Driver Output 1 Low |
| 12 | PGND | P | Power Ground |
| 13 | PVCC | P | Power Supply Voltage |
| 14 | GD2L | O | Gate Driver Output 2 Low |
| 15 | PH2 | I/O | Phase Node 2 |
| 16 | GD2H | O | Gate Driver Output 2 High |
| 17 | BST2 | P | Bootstrap Supply 2 |
| 18 | SS2 | I | Soft Start 2 |
| 19 | FB2 | I | Feedback Input 2 |
| 20 | EA2 | I | Error Amplifier Input 2 |
| 21 | OC2 | O | Over-Current Detection 2 |
| 22 | SYNC/EN | I | Synchronization / Enable |
| 23 | ROSC | I | Oscillator Resistor |
| 24 | AGND | P | Analog Ground |
Notes
- SC2442UA is a dual-channel synchronous buck controller in TSSOP-24 package
- Pin diagram confirms 24-pin configuration with symmetric dual-channel layout (Channel 1: pins 1–12, Channel 2: pins 13–24)
- Power pins: AVCC (1), PVCC (13), PGND (12), AGND (24)
- Bootstrap pins (BST1, BST2) require external bootstrap capacitors for gate driver operation
SC2442UA Electrical Characteristics
Unless specified: T A = T J = -40 to 125°C, VIN = 24V, V CC = 7V, fc = 500KHz
| Parameter | Symbol | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Undervoltage Lockout | ||||||
| Start Threshold | V UVLO | AVCC rising | 4.5 | 4.6 | 4.75 | V |
| UVLO Hysteresis | V HYST | AVCC falling | 0.15 | V | ||
| Power Supply | ||||||
| Operating Current | I QSC | No load, SYNC/EN = Low | 8 | 13 | mA | |
| AVCC/PVCC Regulated | AVCC, PVCC | VIN > 8V | 6.7 | 7 | 7.3 | V |
| BDI Drive Current | I BDI | VIN > AVCC + 2V | 3 | 5 | mA |
SC2442UA Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction.
Operation outside of the parameters specified in the Electrical Characteristics section is not implied.
| Parameter | Symbol | Maximum | Units |
|---|---|---|---|
| BST1, BST2 to PGND SC2442 SC2442H | V BST1, V BST2 | 38 44 | V |
| VIN to PGND SC2442 SC2442H | VIN | 30 36 | V |
| BDI to PGND | V BDI | VIN | V |
| OC1 and OC2 to VIN | VIN - V OC1 , VIN - V OC2 | -0.3 to +0.5 | V |
| PVCC, AVCC to PGND | PVCC, AVCC | 8 | V |
| BST1 to PH1, BST2 to PH2 GD1H to PH1, GD2H to PH2 | -0.3 to 8 | V | |
| GD1L, GD2L to PGND | -0.3 to PVCC | V | |
| PGND to AGND | ±0.3 | V | |
| PH1, PH2 -ve swing wrt PGND (for 100 nS) | V PH1, V PH2 | -1 | V |
| All Other Pins to AGND | -0.3 to AVCC | V | |
| Junction Temperature | -40 to +125 | °C | |
| Storage Temperature Range | -60 to +150 | °C | |
| Lead Temperature (Soldering) 10 Sec. | 260 | °C |
SC2442UA Typical Application
SC2442UA Package Information
SC2442UA Ordering Information
| Part Number | Package | Temp. Range (T A ) |
|---|---|---|
| SC2442ITSTR | TSSOP-24 | -40°C to +125°C |
| SC2442HITSTR | TSSOP-24 | -40°C to +125°C |
Variants on the same datasheet
These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.
| Part Number | Manufacturer | Package |
|---|---|---|
| SC2442 | Semiment | TSSOP-24 |
| SC2442/H | Semtech | TSSOP-24 |
| SC2442H | Semiment | TSSOP-24 |
| SC2442ITSTR | Semiment | TSSOP-24 |
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