BU34DV7NUX
Datasheet
1.8V to 5.5V, 300mA 1ch
Synchronous Boost DC/DC Converter
BU34DV7NUX
●General Description
The BU34DV7NUX devices provide a power supply
solution for products powered by either two-cell alkaline,
NiCd or NiMH, or one-cell Li-ion or Li-polymer battery.
Output currents can go as high as 300mA while using
two alkaline, and discharge it down to 1.8 V.
With the MODE pin, the BU34DV7NUX provides mode
selection of PWM control or PFM/PWM automatic
switching control. When load current is large, the
product switches automatically to the PWM mode so that
high efficiency is achievable over a wide range of load
conditions. The maximum peak current in the boost
switch is typically limited to a value of 1.85A.
<Available Features with MODE=0V>
・Pass-Through Function2 during EN-OFF
・Disconnect Function during UVLO
・UVLO-detect Voltage:1.8V(typ)
・UVLO-release Voltage:2.0V(typ)
・PWM(Switching Frequency 600kHz)
<Available Features with MODE=VIN>
・Disconnect Function during EN-OFF and UVLO
・UVLO-detect Voltage:1.8V(typ)
・UVLO-release Voltage:2.0V(typ)
・PFM/PWM(Switching Frequency to 600kHz)
●Applications
BU34DV7NUX output voltage is fixed by an internal
resistor divider. When VIN voltage is higher than 3.4 V,
Vout is connected with Vin.
・Two-Cell Alkaline, NiCd or NiMH or
Single-Cell Li Battery-Powered Products
・Portable Audio Players
・PDA
・Cellular Phones
●Features
・Synchronous Boost DC/DC Converter(PFM/PWM)
300mA @Vout=3.4V, Vin=1.8V
・Fixed Output voltage (3.4V)
・Pass-Through Function1 (VIN > VOUT<3.4V>)
・Thermal Shutdown
・Personal Medical Products
●Package
10-pin small “VSON010X3030” package.
<3.1mm (Typ.) x 3.1mm (Typ.) x 0.6mm (Max.)>
・VSON010X3030 (Small Package)
●Key Specifications
■ Input voltage range:
■ Output Voltage range:
■ Output current:
1.8V to 5.5V
3.33V to 3.47V
300mA (Max.)
0.6MHz (Typ.)
160mΩ (Typ.)
90mΩ (Typ.)
4.5µA (Max.)
1.5µA (Max.)
-40℃to+85℃
■ Switching frequency:
■ Pch FET ON resistance:
■ Nch FET ON resistance:
■ Standby current (MODE=0V):
■ Standby current (MODE=VIN):
■ Operating temperature range:
VSON010X3030
●Typical Application Circuit
●Typical Performance characteristics
EfficiencyTemp=25
℃
Necessary at PFM
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
PFM2.4V
R1
OUT
VOUT
C2
VIN
C1
C4
PFM1.8V
PWM1.8V
SW
PGND
AGND
RSTBC
EN
L1
COMP
C3
PWM2.4V
MODE
RSTBO
0.1
1
10
100
1000
Iout [mA]
Figure 1. Application Circuit
Figure 2. Efficiency
○Product structure:Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays.
.www.rohm.com
TSZ02201-0Q1Q0AH00100-1-2
02.Aug.2012 Rev.001
© 2012 ROHM Co., Ltd. All rights reserved.
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