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RT7251A Dataheets PDF



Part Number RT7251A
Manufacturers Richtek
Logo Richtek
Description Synchronous Step-Down Converter
Datasheet RT7251A DatasheetRT7251A Datasheet (PDF)

® RT7251A/B 1.5A, 17V, 340/800kHz Synchronous Step-Down Converter General Description The RT7251A/B is a high efficiency, monolithic synchronous step-down DC-DC converter that can operate at 340kHz/800kHz, while delivering up to 1.5A output current from a 4V to 17V input supply. The RT7251A/B's current mode architecture allows the transient response to be optimized. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during sta.

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® RT7251A/B 1.5A, 17V, 340/800kHz Synchronous Step-Down Converter General Description The RT7251A/B is a high efficiency, monolithic synchronous step-down DC-DC converter that can operate at 340kHz/800kHz, while delivering up to 1.5A output current from a 4V to 17V input supply. The RT7251A/B's current mode architecture allows the transient response to be optimized. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault conditions also include output under voltage protection, output over voltage protection and thermal shutdown. The low current (<5μA) shutdown mode provides output disconnection, enabling easy power management in battery-powered systems. The RT7251A/B is available in a WDFN-8L 2x2 package. Ordering Information RT7251A/B Package Type QW : WDFN-8L 2x2 (W-Type) Lead Plating System Z : ECO (Ecological Element with Halogen Free and Pb free) Note : A : 340kHz B : 800kHz Richtek products are :  RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020.  Suitable for use in SnPb or Pb-free soldering processes. Marking Information RT7251AZQW 03 : Product Code 03W W : Date Code Features  4V to 17V Input Voltage Range  1.5A Output Current  Internal N-MOSFETs  Current Mode Control  Fixed Frequency Operation : 340kHz/800kHz  Output Adjustable from 0.8V to 12V  Up to 95% Efficiency  Internal Compensation  Stable with Low ESR Ceramic Output Capacitors  Cycle-by-Cycle Over Current Protection  Input Under Voltage Lockout  Output Under Voltage Protection  Output Over Voltage Protection  Power Good Indicator  Thermal Shutdown Protection  RoHS Compliant and Halogen Free Applications  Industrial and Commercial Low Power Systems  Computer Peripherals  LCD Monitors and TVs  Green Electronics/Appliances  Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs Pin Configuration (TOP VIEW) SW 1 VIN 2 BOOT 3 EN 4 GND 8 GND 7 GND 6 PGOOD 9 5 FB WDFN-8L 2x2 RT7251BZQW 70 : Product Code 70W W : Date Code Copyright ©2023 Richtek Technology Corporation. All rights reserved. DS7251A/B-04 April 2023 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT7251A/B Typical Application Circuit VIN 4V to 17V CIN 10µF PGOOD Chip Enable RT7251A 2 VIN BOOT 3 6 PGOOD 4 EN SW 1 FB 5 7, 8, 9 (Exposed Pad) GND CBOOT 10nF L 15µH R1 110k R2 36k VOUT 3.3V 1.5A COUT 22µF x 2 VIN 4V to 17V CIN 10µF PGOOD Chip Enable RT7251B 2 VIN BOOT 3 6 PGOOD 4 EN SW 1 FB 5 7, 8, 9 (Exposed Pad) GND CBOOT 10nF L 6.8µH R1 47k R2 15k VOUT 3.3V 1.5A COUT 22µF x 2 Table 1. Recommended Component Selection RT7251A VOUT (V) L (H) R1 (k) R2 (k) COUT (F) 1.2 4.7 110 220 22 x 2 2.5 10 110 51 22 x 2 3.3 15 110 36 22 x 2 5 22 120 22 22 x 2 RT7251B VOUT (V) 1.2 2.5 3.3 5 L (H) 3.6 4.7 6.8 10 R1 (k) 47 47 47 62 R2 (k) 91 22 15 12 COUT (F) 22 x 2 22 x.


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