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℃
●Typical
Application Circuit
Necessary at PFM
＜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
Performance characteristics
Efficiency Temp=25
℃
100.0
R1
C1
L1
C3
VIN
C4
SW
COMP
MODE
RSTBO
PGND
AGND
RSTBC
EN
VOUT
OUT
C2
Efficiency [%]
PFM2.4V
90.0
80.0
70.0
PFM1.8V
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.1
1
10
100
1000
PWM1.8V
PWM2.4V
Iout [mA]
Figure 1.
Application Circuit
Figure 2.
Efficiency
○Product
structure：Silicon monolithic integrated circuit
.
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This
product is not designed protection against radioactive rays.
1/24
TSZ02201-0Q1Q0AH00110-1-2
02.Aug.2012 Rev.001
BU33DV7NUX
●Absolute
maximum ratings(Ta=25℃)
Parameter
Maximum applied voltage
Power dissipation1
Power dissipation2
Operating temperature range
Storage temperature range
Symbol
Vmax
Pd1
Pd2
Topr
Tstr
Ratings
7.0
464 (Note1)
1440 (Note2)
-40 to +85
-55 to +125
Unit
V
mW
mW
o
o
Datasheet
Condition
1layer(74.2x74.2mm)board
2
2
(Surface heat radiation copper foil：6.28mm )
4layer(74.2x74.2mm)board
2
(1,4layer heat radiation copper foil：6.28mm )
2
(2,3layer heat radiation copper foil：5500mm )
C
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
Power supply voltage range
Symbol
VCC
Ratings
1.8 to 5.5
Unit
V
Condition
VIN terminal voltage
●Electrical
characteristics [BU34DV7NUX]
(Unless otherwise specified Ta=25℃、VIN=2.4V)
Parameter
Circuit current1(EN=0V)
Circuit current2(EN=0V)
Circuit current1 no switching
(EN=VIN,VOUT=5V)
Circuit current2 no switching
(EN=VIN,VOUT=5V)
Circuit current1(EN=VIN)
Circuit current2(EN=VIN)
Oscillation frequency
Output voltage range
Current limit
EN Input High
EN Input Low
MODE Input High
MODE Input Low
RSTBO output low voltage
RSTBO output high voltage
RSTBC output resistance
SWN1 switch on resistance
SWP1 switch on resistance
SWN2 switch on resistance
SWP2 switch on resistance
UVLO Release Threshold
UVLO Detect Threshold
UVLO Hysteresis
VIN Thru
VIN Thru Hysteresis
Symbol
ICC1A
ICC2A
ICC1B
ICC2B
ICC1C
ICC2C
Fsw
Vout
Ilim
VIH_EN
VIL_EN
VIH_MODE
VIL_MODE
Vrstol
Vrstoh
Rrstbc
Rswn1
Rswp1
Rswn2
Rswp2
VuvloR
VuvloD
Vuvlohys
Vinthru
Vinthruhys
Min.
-
-
-
-
-
-
0.5
3.23
1.4
0.9
-
0.9
-
-
VIN-0.2
450
-
-
-
-
1.9
1.75
-
3.2
20
Typ.
1.6
0.3
140
25
3.5
30
0.6
3.3
1.85
-
-
-
-
0.1
VIN-0.1
600
90
160
1.0
60
2.0
1.8
0.2
3.3
50
Max.
4.5
1.5
250
50
-
-
0.7
3.37
2.2
-
0.2
-
0.2
0.2
-
750
-
-
-
-
2.1
1.85
-
3.4
80
Unit
µA
µA
µA
µA
mA
µA
MHz
V
A
V
V
V
V
V
V
kΩ
mΩ
mΩ
kΩ
Ω
V
V
V
V
mV
Condition
EN=0V,MODE=0V
EN=0V,MODE=VIN
EN=VIN,MODE=0V,
VOUT=5.0V (not include SW)
EN=VIN,MODE=VIN,
VOUT=5.0V (not include SW)
EN=VIN,MODE=0V, Io=0mA
EN=VIN,MODE=VIN, Io=0mA
Io=1mA
DC - Current
Ioi=100uA,MODE=0V
Ioi=-100uA,MODE=0V
VOUT=3.3V
MODE=VIN,EN=0V
MODE=0V,EN=0V
VIN rising
VIN falling
.
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
2/24
TSZ02201-0Q1Q0AH00110-1-2
02.Aug.2012 Rev.001
BU33DV7NUX
●Block
diagram
VIN
UVLO
DELAY
SWN2
Datasheet
RSTBC
RSTBO
VOUT
SOFT
START
VIN
SWP1
SWP2
MODE
CONTROL
LOGIC
VIN
LEVEL
SHIFT
SW
DRIVER
SW
SWN1
TSD
EN
+
-
OSC
+
-
SWN3
COMP
AGND
PGND
Figure 3. Circuit Block
●MODE
INPUT PIN
MODE
PIN
0V
0V
VIN
VIN
EN
PIN
0V
VIN
0V
VIN
UVLO
ON
ON
OFF
ON
UVLO
RELEASE
VOLTAGE
2.0V(typ)
2.0V(typ)
-
2.0V(typ)
FUNCTION
DC/DC-control
PWM
or
PFM/PWM
-
PWM
-
PFM/PWM
SW-ON/OFF
RSTBO
0V
While Soft Start : 0V
After Soft Start : VIN
0V
While Soft Start : 0V
After Soft Start : VIN
SWP2
ON
OFF
OFF
OFF
SWN2
OFF
OFF
ON
OFF
SWN3
OFF
ON
OFF
ON
SWP1
OFF
Switching
OFF
Switching
SWN1
OFF
Switching
OFF
Switching
●Pin
Configuration
Symbol
VIN
SW
COMP
MODE
Pin No.
1
2
3
4
Function
Terminal
circuit
C
C
A
C
A
C
A
B
B
C
0.4±0.1
VSON010X3030
3.0±0.1
Power supply input
Inductor connection terminal
Phase Compensation Pin
Function Select Pin
Soft Start Output Pin
RSTBO
5
While Soft Start : LOW(GND)
After Soft Start : High(VIN)
EN=VIN: Power-ON
EN
6
EN=GND: Power-OFF
RSTBC
7
Low Battery Detect Delay Pin
AGND
8
GND
PGND
9
GND
VOUT
10
Boost voltage output Pin
※
Don’t use EN PIN and MODE PIN at open.
●Input-Output
Equivalent Circuit
I/O equivalent circuit diagram is as follows.
0.6MAX
1PIN MARK
+0.03
0.02 -0.02
(0.12)
3.0±0.1
S
0.08 S
C0.25
1
2.0±0.1
0.5
5
10
0.5
6
+0.05
0.25 -0.04
1.2±0.1
(Unit : mm)
Figure 4. Package
.
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TSZ22111・15・001
3/24
TSZ02201-0Q1Q0AH00110-1-2
02.Aug.2012 Rev.001
BU33DV7NUX
●Electrical
characteristic curves (Reference data)
・Quiescent
Current
Datasheet
EN=OFF ICC PWM
8
7
6
5
7.0
6.0
5.0
OUTPUT VOLTAGE EN=OFF PWM
Ta=85℃
4.0
Ta=85℃
ICC [
μ
A]
4
3
2
1
VOUT[V]
3.0
Ta=25℃
Ta=25℃
2.0
1.0
Ta=-40℃
0
0
1
2
3
4
5
6
7
0.0
0
1
2
Ta=-40℃
3
4
5
6
7
VIN [V]
Figure 5. Quiescent Current PWM
VIN [V]
Figure 6. Out Put Voltage (EN=OFF) PWM
.
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
4/24
TSZ02201-0Q1Q0AH00110-1-2
02.Aug.2012 Rev.001
BU33DV7NUX
●Electrical
characteristic curves (Reference data) - Continued
・Quiescent
Current - Continued
Datasheet
EN=OFF ICC PFM
8
7
0.20
6
5
0.15
0.25
OUTPUT VOLTAGE EN=OFF PFM
Ta=85℃
ICC [
μ
A]
4
3
2
1
0
0
1
2
3
4
5
6
7
VOUT[V]
Ta=85℃
0.10
Ta=25℃
Ta=25℃
Ta=-40℃
0.05
Ta=-40℃
0.00
0
1
2
3
4
5
6
7
VIN [V]
Figure 7. Quiescent Current PFM
VIN [V]
Figure 8. Out Put Voltage (EN=OFF) PFM
・Frequency
Frequency
800
750
700
Freq [kHz]
Ta=85℃
650
Ta=25℃
600
550
Ta=-40℃
500
1.5
2
2.5
3
3.5
VIN [V]
Figure 9. Frequency
.
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/24
TSZ02201-0Q1Q0AH00110-1-2
02.Aug.2012 Rev.001
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