| Part number | SY21138CRHC |
|---|---|
| Channel(#) | 1 |
| Vin (min) (V) | 5.5 |
| Vin (max) (V) | 24 |
| Switching frequency (min)(kHz) | 510 |
| Switching frequency (max)(kHz) | 690 |
| Vout (min) (V) | Fixed 5.1 |
| Vout (max) (V) | |
| Iout (max) (A) | 6 |
| Vout2 (min)(V) | |
| Vout2 (max )(V) | |
| Iout2 (max)(A) | |
| Vref accuracy (±%) | ±1% |
| Vout accuracy(±%) | |
| Control mode | |
| Duty cycle (max)(%) | |
| Operation mode | PFM/USM Selectable |
| Iq (typ) (uA) | 130 |
| Features | Power Good Indicator, Latch-off Protection, Output Discharge |
| Package | QFN2.5×2.5-16 |
| Operating temperature range(°C) | -40°C to 125°C |
| Functional safety category |
The SY21138C develops a high efficiency synchronous step-down DC/DC regulator capable of delivering 6A current. The device integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. In addition, it operates at pseudo-constant frequency of 600kHz under heavy load conditions to minimize the size of inductor and capacitor. SY21138C also provides a fixed 5V LDO with 100mA current capability, which can be used to power the external peripheries. The 5V LDO can switch over to Buck regulator output to save power loss.
Silergy’s proprietary Instant-PWM™ fast-response, constant-on-time (COT) PWM control method supports high input/output voltage ratios (low duty cycles), and fast transient response while maintaining a near constant operating frequency over line, load and output voltage ranges. This control method provides stable operation without complex compensation and even with low ESR ceramic capacitors.
The SY21138C operates over a wide input voltage range from 5.5V to 24V. Cycle-by-cycle current limit, input under voltage lock-out, internal soft-start, output under voltage protection and over voltage protection, and thermal shutdown provide safe operation in all operating conditions.
No Picture
The EVB_SY21138CRHC is intended for evaluating 600kHz, 6A output current, 24V input synchronous Buck regulator.
| Title | Date |
|---|---|
| Automotive_Solutions_Q2_2026 | 2026-06-12 |
| Silergy_Catalog_Q2_2026 | 2026-06-12 |
| QFN2.5x2.5-16 | 2022-05-20 |
