BD9123MUV-E2 ROHM

Datasheet 2.7V to 5.5V , 1.2A 1ch Synchronous Buck Converter with Integrated FET BD9123MUV General Description Key Specifications BD9123MUV is ROHMs high efficiency step-down Input Voltage Range: 2.7V to 5.5V switching regulator designed to produce voltage as low Output Voltage Range: 0.85V to 1.2V as 0.85V to 1.2V from a supply voltage of 5V/3.3V. It Output Current: 1.2A (Max) offers high efficiency by using pulse skip control Switching Frequency: 1MHz(Typ) technology and synchronous switches, and provides Pch FET ON-Resistance: 0.35(Typ) fast transient response to sudden load changes by Nch FET ON-Resistance: 0.25(Typ) implementing current mode control. Standby Current: 0A (Typ) Operating Temperature Range: -40C to +95C Features Fast Transient Response with Current Mode PWM Package W(Typ) x D(Typ) x H(Max) Control System. High Efficiency for All Load Range with TM Synchronous Rectifier (Nch/Pch FET) and SLLM (Simple Light Load Mode) Output Voltage Selector (3 bit) PGOOD Function Soft-Start Function Thermal Shutdown and UVLO Functions. Short-Circuit Protection Circuit with Time Delay Function. Shutdown Function VQFN016V3030 Applications 3.00mm x 3.00mm x 1.00mm Power Supply for LSI including DSP, Microcomputer and ASIC Typical Application Circuit VCC R PG C IN VIN VCC,PVCC EN PGOOD VOUT VOUT L VID<2:0> VID<2:0) SW VOUT ITH GND,PGND R ITH C O CITH Figure 1. Typical Application Circuit Product structure Silicon monolithic integrated circuit This product has no designed protection against radioactive rays www.rohm.com TSZ02201-0J3J0AJ00120-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/24 TSZ22111 14 001 02.Oct.2014 Rev.002 Datasheet BD9123MUV Pin Configuration (TOP VIEW) VID<1> VID<2> VID<0> VOUT > 12 11 10 9 EN ITH 13 8 PGOOD 7 VCC 14 (TOP VIEW) PVCC 6 GND 15 PVCC PGND 5 16 1 2 3 4 SW SW SW PGND Figure 2. Pin Configuration Pin Description Pin No. Pin name Function 1 2 SW Pch/Nch FET drain output pin 3 4 PGND Nch FET source pin 5 Ground 6 GND 7 PGOOD Power good pin Gm Amp output pin/connected phase 8 ITH compensation capacitor 9 VOUT Output voltage pin Output voltage control pin<2> 10 VID<2> 11 VID<1> Output voltage control pin<1> 12 VID<0> Output voltage control pin<0> 13 Enable pin(High Active EN 14 VCC power supply input pin VCC 15 Pch FET source pin PVCC 16 Block Diagram V CC EN 0.1F 13 VCC 14 VREF 100 PVCC 15 Input Current VID<0> 12 Comp 10F 16 Current VID<1> 11 SELECTOR R Q Sense/ Protect SW S VID<2> 10 1 SLOPE 4.7H Output + CLK Gm Amp 2 Driver OSC 3 VOUT Logic 9 22F VCC V CC PGND Soft UVLO Start 4 5 7 TSD PGOOD PGOOD 6 GND 8 ITH RITH CITH Figure 3. Block Diagram www.rohm.com TSZ02201-0J3J0AJ00120-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/24 TSZ22111 15 001 02.Oct.2014 Rev.002