bd9575fv-e2 ROHM Co. Ltd., bd9575fv-e2 Datasheet
bd9575fv-e2
Related parts for bd9575fv-e2
bd9575fv-e2 Summary of contents
Page 1
... DDR-SDRAM Cores BD9575FV ●Description BD9575FV is a switching regulator controller with high output current which can achieve low output voltage (0.7V to 2.0V) from a wide input voltage range (4.5V to 28V). High efficiency for the switching regulator can be realized by utilizing an external N-MOSFET power transistor. A new technology called H3Reg ultra high transient response against load change ...
Page 2
... BD9575FV ●Operating Conditions (Ta=25℃) Parameter Input Voltage 1 Input Voltage 2 Input Voltage 3 BOOT Voltage SW Voltage BOOT-SW Voltage SLLM Input Voltage EN Input Voltage Output setting voltage Is Input Voltage MIN ON Time *This product should not be used in a radioactive environment. ●Electrical characteristics (unless otherwise noted, Ta=25℃ VCC=5V, VDD=5V, EN/SLLM=5V, VIN=12V, REF=1.8V, R ...
Page 3
... BD9575FV ●Electrical characteristics – Continued (unless otherwise noted, Ta=25℃ VCC=5V, VDD=5V, EN/SLLM=5V, VIN=12V, REF=1.8V, R Parameter [SCP] SCP Detect Voltage SCP threshold voltage Charge current Standby voltage [OVP] OVP Detect Voltage [Soft start] Charge current Standby voltage [Over Current Protection Block] Current limit threshold1 ...
Page 4
... BD9575FV ●Reference Data 600 590 580 570 560 550 - [℃] Fig Icc 4.30 4.25 Sweep up 4.20 4.15 4.10 Sweep down 4.05 4.00 - (℃) Fig UVLO ( 2.8 2.4 2.0 1.6 1.2 Right: -10℃ Middle: 25℃ 0.8 Left: 100℃ 0.4 0.0 0 1.5 3 4.5 6 Vcc [V] Fig VREG (Start up) ...
Page 5
... BD9575FV ●Reference Data – Continued ILIM=0. [℃] Fig. current limit threshould 100 SLLM 80 Continuous 60 mode 100 1000 10000 Io(mA) Fig. Efficiency (V =7V) IN VOUT HG/LG IOUT Fig.19 Load Transient Response (V =7V) IN VOUT HG/LG IOUT Fig.22 Load Transient ...
Page 6
... BD9575FV ●Reference Data – Continued VOUT IL HG/LG Fig.25 SLLM (I =0A) OUT IL HG/LG/SW Fig.28 Continuous MODE (Io=0A) VIN HG/LG VOUT Fig.31 VIN change (5→19V) 1.82 1.81 Continuous mode 1.8 SLLM 1.79 1. 100 1000 Iout [mA] Fig. OUT OUT www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. VOUT IL HG/LG Fig.26 SLLM (I =0 ...
Page 7
... BD9575FV ●Block Diagram VCC 5 VREG EN 7 Reference VIN Block REF×0.7 SS×0.7 SCP SCP 10 VOUT 3 REF SS + VOUT + 1 UVLO ILIM TSD Thermal SCP Protection TSD 4 GND ●PHYSICAL DIMENSIONS ●Pin Number・Pin Name PinNo. Pin Name 1 VOUT 2 VREG 3 REF 4 GND 5 VCC 6 ILIM 7 EN ...
Page 8
... It is recommended that a 0.1μF bypass capacitor be put in this pin. ・ILIM (6pin) BD9575FV detects the voltage between Is+ pin and Is- pin and limits the output current (OCP). Voltage equivalent to 1/10 of the ILIM voltage is the voltage drop of external current sense resistor. A very low current sense resistor or inductor DCR can also be used for this platform. ・ ...
Page 9
... BD9575FV ●Explanation of Operation The BD9575FV is a synchronous buck regulator controller incorporating ROHM’s proprietary H drops due to a rapid load change, the system quickly restores V system. When V OUT Thus, it serves to improve the regulator’s transient response. Activating the Light Load Mode will also exercise Simple Light Load Mode (SLLM) control when the load is light, to further increase efficiency ...
Page 10
... BD9575FV ●Timing Chart ・Soft Start Function OUT IIN ・Timer Latch Type Short Circuit Protection REF×0.7 V OUT T SCP SCP EN/UVLO ・Over Voltage Protection REF×1.2 VOUT HG LG Switching www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Soft start is exercised with the EN pin set high. Current control takes effect at startup, enabling a moderate output voltage “ ...
Page 11
... BD9575FV ●External Component Selection 1. Inductor (L) selection Δ OUT L Co Output ripple current ※Passing a current larger than the inductor’s rated current will cause magnetic saturation in the inductor and decrease system efficiency. In selecting the inductor, be sure to allow enough margin to assure that peak current does not exceed the inductor rated current value. ※ ...
Page 12
... BD9575FV 4. MOSFET Selection V IN main switch V OUT L Co synchronous switch 5. Setting Detection Resistance Current limit Current limit www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Loss on the main MOSFET Pmain RON ...
Page 13
... BD9575FV 6.Setting frequency 3000 VIN=5V 7V 2500 12V 16V 19V 2000 1500 1000 500 100 RFS [kΩ] Calculated frequency 1200 1000 800 600 400 200 100 Resistance [kΩ] 7. Setting standard voltage (REF) V REF 3 H Reg CONTROLLA Outside voltage V OUT VREG ...
Page 14
... BD9575FV 8. Setting output voltage This IC is operated that output voltage is REF≒VOUT. And it is operated that output voltage is feed back to FB pin in case the output voltage is 0.7V to 2.0V REF H Reg CONTROLLA V OUT It is operated that the resistance division value of the output voltage is feed back to V more than 2 ...
Page 15
... BD9575FV ●I/O Equivalent Circuit 6pin (ILIM) VCC 9pin (SLLM) VCC 12pin (Is+) VCC 17pin (HG) BOOT BOOT 20pin (FS) VCC 3pin (REF) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 7pin (EN) 10pin (SCP) VCC 14pin (LG) VDD VCC 18pin (BOOT 1pin (VOUT) VCC 15/20 Technical Note ...
Page 16
... LG ILIM 13 PGND 3 R4 REF Is+ SCP Is VCC 1 VOUT 4 GND Part name Part No BD9575FV R4 RSS100N03 R5 RSS100N03 R6 RB521S-30 R7 RB051L-40 R8 CM105B105K06A R9 CM105B105K16A R10 GRM39C0G101J50 R11 R12 R13 CM21B106K06 R14 R15 CM05B104K25A R16 CM316B106M16A R17 CM316B106M16A R18 GRM39X7R102K50 R19 ...
Page 17
... LG ILIM 13 PGND 3 R4 REF Is+ SCP Is VCC 1 VOUT 4 GND Part name Part No BD9575FV R4 RSS100N03 R5 RSS100N03 R6 RB521S-30 R7 RB051L-40 R8 CM105B105K06A R9 CM105B105K16A R10 GRM39C0G101J50 R11 R12 R13 CM21B106K06 R14 CM05B104K25A R15 CM05B104K25A R16 CM316B106M16A R17 CM316B106M16A R18 GRM39X7R102K50 ...
Page 18
... IC off to prevent thermal runaway not designed to protect the IC or guarantee its operation. Do not continue to use the IC after operating this circuit or use the environment where the operation of this circuit is assumed. BD9575FV 10. Testing on application boards When testing the application board, connecting a capacitor to a pin with low impedance subjects the IC to stress. ...
Page 19
... BD9575FV 11. Regarding input pin of the IC This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them isolated. P-N junctions are formed at the intersection of these P layers with the N layers of other elements, creating a parasitic diode or transistor. For example, the relation between each potential is as follows: When GND > ...
Page 20
... BD9575FV ●Ordering part number Part No. Part No. SSOP-B20 6.5 ± 0 0.1 0.65 0.22 ± 0.1 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved Package FV : SSOP-B20 <Tape and Reel information> Tape Embossed carrier tape Quantity 2500pcs E2 Direction The direction is the 1pin of product is at the upper left when you hold ...
Page 21
No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose ...