Innovations Embedded Power Management Current Mode Step-Down Regulators for point-of-load applications < Home ROHM MarketingUSA Electronics < Handheld < Portable < Mobile < Disk Drives Selection Guide Current Mode Step-Down Regulators from ROHM Semiconductor load conditions, fast load response, a is maintained using ROHM’s innovative regulators play an essential role in the Point-of-load, step-down voltage wide range of input voltages, available Simple Light Load Mode (SLLM) control. power distribution and management adjustable output voltage down to 1V and BD91x Series devices are designed in a wide range of electronic devices. available chip-scale packaging. to seamlessly transfer between full The new BD91x Series of regulators High-frequency PWM voltage output from ROHM Semiconductor offers control is enhanced using current mode designers an exceptional choice due to feedback to provide exceptional load their high efficiency over full load to light response. In addition, light load efficiency PWM and SLLM based on load current requirements. Current Mode Feedback Current mode feedback assures stable voltage regulation during rapid load changes. High Efficiency CMOS Output BD91x Series devices all incorporate ROHM’s P-channel / N-channel power CMOS output that provides both low ON-resistance and low switching losses while reducing the number of external components. Adjustable Output Voltage Simple resistor network sets output voltage on some models. Fixed output models (±2%) also offered. 1.888.775.ROHM Enhanced Protection Circuitry PWM / SLLM Control Built-in thermal shut-down, over-current and under-voltage lockout protection assure system reliability. Two-tier control strategy maximizes power efficiency over a full range of load conditions. www.rohmsemiconductor.com CNAxxxxx Current Mode Step-Down Regulators from ROHM Semiconductor Designed for Efficiency and Reliability Low ON-resistance MOSFETs (using DMOS process) results high efficiency buck regulation with a minimum of external components. Current Mode PWM control maintains stable output voltage during load transients. Simple Light Load Mode control sustains high efficiency operation during lightly loaded conditions. Most internal circuits are turned off during standby, reducing standby current to virtually zero and improving battery life in portable applications. Output stabilization simply requires a small low ESR ceramic capacitor, saving space and increasing efficiency. Smaller output inductor size reduces overall circuit footprint. Protection from ESD voltage of up to 4 kV Human Body Model (HBM) has been achieved through optimization of processes and circuitry. Built-in protection circuits guard against over-current, over-temperature and under-voltage. Wide operating temperature range makes these devices suitable for a wide range of applications. 1.888.775.ROHM www.rohmsemiconductor.com CNAxxxx Current Mode Step-Down Regulators from ROHM Semiconductor Simple Light Load Mode Control (SLLM) Efficiency ratings for power supplies at full load do not The BD91X Series of step-down regulators incorporates a adequately reflect the unit’s power consumption under actual two-stage regulation technique designed to seamlessly and operation conditions. To extend the length of operation of efficiently deliver power to the load under widely varying load portable products on a single battery charge, power must conditions. Under large load conditions, conventional PWM be reduced in all operating modes. Improved efficiency at control is employed; under light load conditions, Simple Light all operating points including more typical situations such as Load Mode control is used. very light loads is an important concern in the design of next generation “green” products. Power Loss Elements Switching Loss P SW Gate Drive Loss P GATE ESR Loss P ESR Reduced SLLM switching waveform PWM switching waveform SW SW IL Intermittent Switching 0A Vo IL NonSwitching 0A Vo(AVE) Vo Simple Light Load Mode (SLLM) Efficiency[%] 100 80 Vo(AVE) SLLM 60 40 20 0 0.001 0.01 0.1 1 Output Current[A] To download an informative white paper providing more details on ROHM’s innovative SLLM control, click on this link: “Optimizing Power Efficiency in POL Switching Regulators Using SLLM (Simple Light Load Mode) Control.” 1.888.775.ROHM www.rohmsemiconductor.com CNAxxxxx Current Mode Step-Down Regulators Part Selection Guide Lower Current Models – Output Current (lo)<1A Number of Input Voltage Output Voltage Outputs Output Current Operating Temperature Operating Frequency BD9122GUL 1 2.5 ~ 5.5V Adj (1.0~2.0V) 0.3A -30~ 85°C 1MHz Feature Package Small package (WL-CSP) VCSP50L2 (1.1×2.5) BD9180GUL 1 2.3 ~ 5.5V 1.875V±1.5% 0.3A -30~ 85°C 2MHz Ultra Small package VCSP50L1 (1.1×1.6) BD9192GUL VCSP50L2 (1.1×2.5) 2 2.3 ~ 5.5V 1.2V±1.5% 0.3A -30~ 85°C 2MHz 1.8V±1.5% 2ch DC/DC Output Ultra Small package BD9161FVM 1 2.5 ~ 4.5V Adj (1.0~3.3V) 0.6A -25~ 85°C 1MHz 100% Max Duty Function MSOP (2.9×4.0) BD9102FVM 1 4.0 ~ 5.5V 1.24V ±2% 0.8A -25 ~ 85°C 1MHz No Output Resistors Required MSOP8 (2.9×4.0) BD9106FVM MSOP8 (2.9×4.0) 1 4.0 ~ 5.5V Adj (1.0~2.5V) 0.8A -25 ~ 85°C 1MHz Fast Transient Response High Efficiency BD9109FVM 1 4.5 ~ 5.5V 3.30V ±2% 0.8A -25 ~ 85°C 1MHz No Output Resistors Required MSOP8 (2.9×4.0) BD9120HFN Fast Transient Response High Efficiency HSON8 (2.9×3.0) Start-up Sequence Pch Switch Control VQFN020V4040 (4.0×4.0) 1 2.7 ~ 4.5V Adj (1.0~1.5V) 0.8A -25 ~ 85°C 1MHz BD9151MUV 2 2.8 ~ 5.5V 1.2V±1.5% 1.8V±1.5% 0.8A -40 ~ 85°C 1MHz 0.8A BD9104FVM 1 4.5 ~ 5.5V 3.30V ±2% 0.9A -25 ~ 85°C 1MHz No Output Resistors Required MSOP8 (2.9×4.0) Higher Current Models – Output Current (lo)>1A Number of Input Voltage Output Voltage Outputs Output Current Operating Temperature Operating Frequency BD9107FVM 1 4.0 ~ 5.5V Adj (1.0~1.8V) 1.2A -25 ~ 85°C 1MHz BD9150MUV 2 4.75 ~ 5.5V 3.30V±1.5% Adj (0.8~2.5V) BD9152MUV 3.30V±1.5% 1.5A -40 ~ 85°C 1MHz Adj (0.8~2.5V) 2 4.5 ~ 5.5V 1.5A -40 ~ 85°C 1.5MHz Feature Package Fast Transient Response High Efficiency MSOP8 (2.9×4.0) 2ch DC/DC Output Small package VQFN020V4040 (4.0×4.0) 2ch DC/DC Output with Start-up Sequence VQFN020V4040 (4.0×4.0) BD9110NV 1 4.5 ~ 5.5V Adj (1.0~2.5V) 2.0A -25 ~ 105°C 1MHz Low Ripple Output SON008V5060 (5.0×6.0) BD9111NV 1 4.5 ~ 5.5V 3.30V±1.5% 2.0A -25 ~ 105°C 1MHz Fast Transient Response High Efficiency SON008V5060 (5.0×6.0) BD9130NV 1 2.7 ~ 5.5V Adj (1.0~2.5V) 2.0A -25 ~ 105°C 1MHz Fast Transient Response High Efficiency SON008V5060 (5.0×6.0) BD9130EFJ Fast Transient Response High Efficiency HTSOP-J8 (5.0×6.0) 1 2.7 ~ 5.5V Adj (1.0~2.5V) 2.0A -25 ~ 105°C 1MHz BD9132MUV 1 2.7 ~ 5.5V Adj (1.0~2.5V) 3.0A -40 ~ 105°C 1MHz Very High Efficiency VQFN020V4040 (4.0×4.0) BD9139MUV VQFN016V3030 (3.0×3.0) 1 2.7 ~ 5.5V Adj (1.0~3.3V) 3.0A -40 ~ 105°C 1MHz Very High Efficiency Small Package BD9134MUV 1 4.5 ~ 5.5V 3.30V±1.5% 3.0A -40 ~ 105°C 1MHz No Output Resistors Required VQFN020V4040 (4.0×4.0) BD9137MUV Excellent Efficiency PWM/SLLM select VQFN020V4040 (4.0×4.0) 1 4.5~13.2V Adj (3.0~6.0V) 2.0A -40 ~ 105°C 500 kHz High Input Voltage VQFN020V4040 (4.0×4.0) 1 2.7 ~ 5.5V Adj (1.0~3.3V) 4.0A -40 ~ 105°C 1MHz BD9141MUV 1.888.775.ROHM www.rohmsemiconductor.com CNAxxxxx Current Mode Step-Down Regulators Package Dimensions SON008V5060 [Unit : mm] +0.05 0.25 -0.04 Actual size 8 (0.30) (0.15) (0.45) (0.2) 3.00±0.2 2.90±0.2 0.6Max. 0.13 +0.1 -0.05 0.32±0.10 0.65 Actual size VCSP50L2 1PIN MARK [Unit : mm] 2.5±0.05 [Unit : mm] TOP VIEW 1.1±0.05 0.1±0.05 0.55MAX 0.08 S 0.05 AB (ø0.15)INDEX POST Actual size 0.3±0.05 B 1 0.5 0.08 6-ø0.25±0.05 0.05 S AB B (ø0.15)INDEX POST B P=0.5X2 6-ø0.25±0.05 SIDE VIEW S 0.3±0.05 0.08 M 0.08 S TOP VIEW 1.1±0.05 SIDE VIEW S B 1.888.775.ROHM 1 2 3 4 Actual size 1PIN MARK 0.145 +0.05 -0.03 0.22 +0.05 -0.04 0.65 0.4 +0.05 -0.04 5 1.6±0.05 2.8±0.1 0.9MAX 0.75±0.05 0.08±0.05 0.475 6 0.1±0.05 0.55MAX 4 4.0±0.2 1 7 0.29±0.015 0.6±0.2 2.9±0.1 (2.2) (0.05) 87 6 5 VCSP50L1 [Unit : mm] 5 4 0.59 MSOP8 8 3 2.90±0.2 3.6±0.1 11 0.5 2 0.3±0.05 10 15 1.27 1 P=0.5X2 6 16 1.0 4.2±0.1 C0.25 5 20 0.02 +0.03 -0.02 (0.22) (0.22) 2.1±0.1 1 S 0.08 S 0.8±0.1 0.4±0.1 C0.2 S 2.1±0.1 0.08 0.02 +0.03 -0.02 S [Unit : mm] 0.475 1PIN MARK 1.0MAX 1.0MAX 6.0±0.15 4.0±0.1 5.0±0.15 (1.8) [Unit : mm] 4.0±0.1 HSON8 (0.2) VQFN020V4040 2 BOTTOM VIEW Actual size www.rohmsemiconductor.com 0.3±0.05 1 2 0.5 Actual size BOTTOM VIEW CNAxxxxx 10145 Pacific Heights Blvd., Suite 1000 San Diego, CA 92121 www.rohmsemiconductor.com | 1.888.775.ROHM NOTE: For the most current product information, contact a ROHM sales representative in your area. ROHM assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representations that the circuits are free from patent infringement. Specifications subject to change without notice for the purpose of improvement. The products listed in this catalog are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of which would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. © 2009 ROHM Semiconductor USA, LLC. Although every effort has been made to ensure accuracy, ROHM accepts no responsibility for errors or omissions. Specifications and product availability may be revised without notice. No part of this document represents an offer or contract. Industry part numbers, where specified, are given as an approximate comparative guide to circuit function only. Consult ROHM prior to use of components in safety, health or life-critical systems. All trademarks acknowledged.