Datasheet 1.8V to 5.5V, 300mA 1ch Synchronous Boost DC/DC Converter BU34DV7NUX General Description The BU34DV7NUX devices provide a power supply Available Features with MODE=0V solution for products powered by either two-cell alkaline, Pass-Through Function2 during EN-OFF NiCd or NiMH, or one-cell Li-ion or Li-polymer battery. Disconnect Function during UVLO Output currents can go as high as 300mA while using UVLO-detect Voltage:1.8V(typ) two alkaline, and discharge it down to 1.8 V. UVLO-release Voltage:2.0V(typ) With the MODE pin, the BU34DV7NUX provides mode PWM(Switching Frequency 600kHz) selection of PWM control or PFM/PWM automatic Available Features with MODE=VIN switching control. When load current is large, the product switches automatically to the PWM mode so that Disconnect Function during EN-OFF and UVLO high efficiency is achievable over a wide range of load UVLO-detect Voltage:1.8V(typ) conditions. The maximum peak current in the boost UVLO-release Voltage:2.0V(typ) switch is typically limited to a value of 1.85A. PFM/PWM(Switching Frequency to 600kHz) BU34DV7NUX output voltage is fixed by an internal Applications resistor divider. When VIN voltage is higher than 3.4 V, Two-Cell Alkaline, NiCd or NiMH or Vout is connected with Vin. Single-Cell Li Battery-Powered Products Features Portable Audio Players Synchronous Boost DC/DC Converter(PFM/PWM) PDA 300mA Vout=3.4V, Vin=1.8V Cellular Phones Fixed Output voltage (3.4V) Personal Medical Products Pass-Through Function1 (VIN > VOUT<3.4V>) Package Thermal Shutdown 10-pin small VSON010X3030 package. VSON010X3030 (Small Package) <3.1mm (Typ.) x 3.1mm (Typ.) x 0.6mm (Max.)> Key Specifications Input voltage range: 1.8V to 5.5V Output Voltage range: 3.33V to 3.47V Output current: 300mA (Max.) Switching frequency: 0.6MHz (Typ.) Pch FET ON resistance: 160m (Typ.) Nch FET ON resistance: 90m (Typ.) Standby current (MODE=0V): 4.5A (Max.) Standby current (MODE=VIN): 1.5A (Max.) VSON010X3030 Operating temperature range: -40to+85 Typical Application Circuit Typical Performance characteristics Efficiency Temp=25 Necessary at PFM 100.0 PFM2.4V R1 90.0 OUT VIN VOUT 80.0 C1 C2 C4 70.0 PFM1.8V SW PGND 60.0 L1 PWM1.8V 50.0 COMP AGND 40.0 C3 PWM2.4V 30.0 MODE RSTBC 20.0 10.0 RSTBO EN 0.0 0.1 1 10 100 1000 Iout mA Figure 1. Application Circuit Figure 2. Efficiency Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays www.rohm.com TSZ02201-0Q1Q0AH00100-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/24 TSZ2211114001 02.Aug.2012 Rev.001 Efficiency % DatasheetDatasheet BU34DV7NUX Absolute maximum ratings(Ta=25) Parameter Symbol Ratings Unit Condition Maximum applied voltage Vmax 7.0 V 1layer(74.2x74.2mm)board 2 Power dissipation1 Pd1 464 (Note1) mW 2 (Surface heat radiation copper foil6.28mm ) 4layer(74.2x74.2mm)board 2 Power dissipation2 Pd2 1440 (Note2) mW (1,4layer heat radiation copper foil6.28mm ) 2 (2,3layer heat radiation copper foil5500mm ) o Operating temperature range Topr -40 to +85 C o Storage temperature range Tstr -55 to +125 C *1 When it is used by more than Ta=25, it is reduced by 4.64mW/. *2 When it is used by more than Ta=25, it is reduced by 14.4mW/. Operating conditions Parameter Symbol Ratings Unit Condition Power supply voltage range VCC 1.8 to 5.5 V VIN terminal voltage Electrical characteristics BU34DV7NUX (Unless otherwise specified Ta=25VIN=2.4V) Parameter Symbol Min. Typ. Max. Unit Condition Circuit current1(EN=0V) ICC1A - 1.6 4.5 A EN=0V,MODE=0V Circuit current2(EN=0V) ICC2A - 0.3 1.5 A EN=0V,MODE=VIN Circuit current1 no switching EN=VIN,MODE=0V, ICC1B - 140 250 A (EN=VIN,VOUT=5V) VOUT=5.0V (not include SW) Circuit current2 no switching EN=VIN,MODE=VIN, ICC2B - 25 50 A (EN=VIN,VOUT=5V) VOUT=5.0V (not include SW) Circuit current1(EN=VIN) ICC1C - 3.5 - mA EN=VIN,MODE=0V, Io=0mA Circuit current2(EN=VIN) ICC2C - 30 - A EN=VIN,MODE=VIN, Io=0mA Oscillation frequency Fsw 0.5 0.6 0.7 MHz Output voltage range Vout 3.33 3.4 3.47 V Io=1mA Current limit Ilim 1.4 1.85 2.2 A DC - Current EN Input High VIH EN 0.9 - - V EN Input Low VIL EN - - 0.2 V MODE Input High VIH MODE 0.9 - - V MODE Input Low VIL MODE - - 0.2 V RSTBO output low voltage Vrstol - 0.1 0.2 V Ioi=100uA,MODE=0V RSTBO output high voltage Vrstoh VIN-0.2 VIN-0.1 - V Ioi=-100uA,MODE=0V RSTBC output resistance Rrstbc 450 600 750 k SWN1 switch on resistance Rswn1 - 90 - m VOUT=3.4V SWP1 switch on resistance Rswp1 - 160 - m SWN2 switch on resistance Rswn2 - 1.0 - k MODE=VIN,EN=0V SWP2 switch on resistance Rswp2 - 60 - MODE=0V,EN=0V UVLO Release Threshold VuvloR 1.9 2.0 2.1 V VIN rising UVLO Detect Threshold VuvloD 1.75 1.8 1.85 V VIN falling UVLO Hysteresis Vuvlohys - 0.2 - V VIN Thru Vinthru 3.3 3.4 3.5 V VIN Thru Hysteresis Vinthruhys 20 50 80 mV . www.rohm.com TSZ02201-0Q1Q0AH00100-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/24 TSZ2211115001 02.Aug.2012 Rev.001