BU33DV7NUX Datasheet, PDF (1/27 Pages) Rohm – 1.8V to 5.5V, 300mA 1ch Synchronous Boost DC/DC Converter

BU33DV7NUX
Datasheet
1.8V to 5.5V, 300mA 1ch
Synchronous Boost DC/DC Converter
BU33DV7NUX
●General Description
The BU33DV7NUX 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 BU33DV7NUX 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.
BU33DV7NUX output voltage is fixed by an internal
resistor divider. When VIN voltage is higher than 3.3 V,
Vout is connected with Vin.
●Features
・Synchronous Boost DC/DC Converter(PFM/PWM)
300mA @Vout=3.3V, Vin=1.8V
・Fixed Output voltage (3.3V)
・Pass-Through Function1 (VIN > VOUT<3.3V>)
・Thermal Shutdown
・VSON010X3030 (Small Package)
●Key Specifications
■ Input voltage range:
1.8V to 5.5V
■ Output Voltage range:
3.23V to 3.37V
■ Output current:
300mA (Max.)
■ Switching frequency:
0.6MHz (Typ.)
■ Pch FET ON resistance:
160mΩ (Typ.)
■ Nch FET ON resistance:
90mΩ (Typ.)
■ Standby current (MODE=0V):
4.5µA (Max.)
■ Standby current (MODE=VIN):
1.5µA (Max.)
■ Operating temperature range:
-40℃to+85℃
＜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
・Two-Cell Alkaline, NiCd or NiMH or
Single-Cell Li Battery-Powered Products
・Portable Audio Players
・PDA
・Cellular Phones
・Personal Medical Products
●Package
10-pin small “VSON010X3030” package.
<3.1mm (Typ.) x 3.1mm (Typ.) x 0.6mm (Max.)>
VSON010X3030
●Typical Application Circuit
Necessary at PFM
R1
VIN
C1
C4
L1
SW
COMP
C3
MODE
RSTBO
OUT
VOUT
C2
PGND
AGND
RSTBC
EN
Figure 1. Application Circuit
●Typical Performance characteristics
Efficiency Temp=25℃
100.0
90.0
PFM2.4V
80.0
70.0
PFM1.8V
60.0
50.0
PWM1.8V
40.0
30.0
PWM2.4V
20.0
10.0
0.0
0.1
1
10
100
1000
Iout [mA]
Figure 2. Efficiency
○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays.
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TSZ02201-0Q1Q0AH00110-1-2
02.Aug.2012 Rev.001