Datasheet
Synchronous Boost DC/DC Converter
(LOAD:500mA@Vout=3.3V,Vin=1.8V)
BU33UV7NUX
General Description
BU33UV7NUX is a synchronous buck-boost convertor with
low power consumption and provides a power supply for
products powered by either two-cell alkaline/ NiCd/ NiMH or
one-cell Li-ion or Li-polymer battery.
Output currents can go as high as 500mA while using two
alkaline, and discharge it down to 1.8 V.
BU33UV7NUX has reset circuit. (Detection voltage:1.5 V,
Release Voltage:1.9 V)
BU33UV7NUX output voltage is fixed 3.3V by internal
resistor divider. Vout is connected with Vin when VIN voltage
is higher than 3.3 V,
Features
■
Synchronous Boost DC/DC Converter
Iomax500mA @Vout=3.3V, Vin=1.8V(Ta=25°C)
■
Disconnect Function during EN-OFF and UVLO
■
Auto-PFM/PWM (MODE=H(=VIN)),
FIXED PFM
(MODE=L(=0V))
■
Reset Function (Detect Voltage = 1.5V)
■
Pass-Through Function (VIN > VOUT)
■
Thermal Shutdown
■
10-pin “VSON010X3020” package
Key Specifications
■
Input voltage range
■
Fixed Output voltage
■
Efficiency
■
Current Consumption
■
Start-up Voltage
0.6 ~ 4.5V
3.3V
94%(Max.)
7μA(Mode=Low)
13μA(Mode=High)
0.9V
Package
VSON010X3020
W(Typ) x D(Typ) x H(Max)
3.00mm x 2.00mm x 0.60mm
Applications
■
Single-Cell or Two-Cell Alkaline, NiCd or NiMH or
Single-Cell Li Battery-Powered Products
■
IC Recorders
■
Wireless Mouse
■
Portable Audio Players
■
Cellular Phones
■
Personal Medical Products
■
Remote controllers
Typical Application Circuit
VIN
Typical Performance characteristics
Efficiency (Vin=2.4V, Vout=3.3V)
100
95
C2: 1uF
INTLDO
AGND
FB
EN
RSTB
VIN
PGND
SW
VOUT
MODE
VIN
C0: 10uF
L0:4.7uH
Efficiency [%]
90
85
80
MODE=H
C1
VOUT
75
70
65
60
0.1
1
10
Output current [mA]
MODE=L
MODE=H : Auto-PFM/PWM
MODE=L : Fixed PFM
Figure 1. Application Circuit
100
1000
Figure 2. Efficiency
○
Product structure：Silicon monolithic integrated circuit
○
This product is not designed protection against radioactive rays
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BU33UV7NUX
Pin Configuration
(TOP VIEW)
INTLDO 1
AGND 2
FB 3
EN 4
RSTB 5
10 VIN
9 PGND
8 SW
7 VOUT
6 MODE
Figure 3. Pin Configuration
Pin Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
Pin Name
INTLDO
AGND
FB
EN
RSTB
MODE
VOUT
SW
PGND
VIN
Function
Internal power supply
GND
Output feedback
EN=VIN : Power-ON
EN=GND : Power-OFF
Low battery detection
MODE =VIN :
Auto-PFM/PWM
MODE =GND : Fixed PFM
Boost voltage output
Inductor connection
Power GND
Power supply
※
Don’t use EN and MODE PIN at open.
Block Diagram
Reset circuit
Detect Voltage：1.5V
VIN
Release Voltage：1.9V
VIN
RSTB
+
-
+
-
VIN
LDO
OVP
INTLDO
VOUT
VIN
SWP
CONTROL
LOGIC
MODE
VIN
LEVEL
SHIFT
DRIVER
SW
ENB
EN
FB
+
-
TSD
OSC
ENB
AGND
+
-
SWN
PGND
Figure 4. Circuit Block
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BU33UV7NUX
Absolute Maximum Ratings (Tj = 25°C)
Parameter
Maximum applied voltage1
Maximum applied voltage2 [INTLDO]
Junction Temperature Range
Storage Temperature Range
Symbol
Vmax1
Vmax2
T
j
T
stg
Ratings
6.5
2.5
-40
½
+85
-55
½
+125
Unit
V
V
o
C
o
C
Caution:
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the
absolute maximum ratings.
Thermal Resistance
(Note 1)
Parameter
VSON010X3020
Junction to Ambient
Junction to Top Characterization Parameter
(Note 2)
Symbol
Thermal Resistance (Typ)
1s
(Note 3)
2s2p
(Note
4)
Unit
θ
JA
Ψ
JT
274.8
31
39.4
6
°C/W
°C/W
(Note 1)Based
on JESD51-2A(Still-Air)
(Note 2)The
thermal characterization parameter to report the difference between junction temperature and the temperature at the top center of the outside
surface of the component package.
(Note 3)Using
a PCB board based on JESD51-3.
Layer Number of
Measurement Board
Single
Top
Copper Pattern
Footprints and Traces
Layer Number of
Measurement Board
4 Layers
Top
Copper Pattern
Footprints and Traces
Material
FR-4
Board Size
114.3mm x 76.2mm x 1.57mmt
Thickness
70μm
(Note 4)Using
a PCB board based on JESD51-5, 7.
Material
FR-4
Board Size
114.3mm x 76.2mm x 1.6mmt
2 Internal Layers
Thermal Via
(Note 5)
Pitch
1.20mm
Bottom
Copper Pattern
74.2mm x 74.2mm
Thickness
70μm
35μm
Diameter
Φ0.30mm
Thickness
70μm
Copper Pattern
74.2mm x 74.2mm
Thickness
(Note 5)
This thermal via connects with the copper pattern of all layers..
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BU33UV7NUX
Recommended Operating Conditions (Tj= -40°C to +85°C)
Parameter
Power supply voltage range
(Note 1): When it is Vout=3.3V
Symbol
VIN
Ratings
(Note1)
0.6
~ 4.5
Unit
V
Condition
VIN terminal voltage
Electrical Characteristics (Unless otherwise specified V
IN
=2.4V, L0=4.7uH, C1=22
μF
×2, Tj=25°C)
Parameter
Circuit current1
Circuit current2
Circuit current3
Switching frequency
Output voltage
Maximum output current1
Maximum output current2
EN Input High
EN Input Low
SWN switch on resistance
SWP switch on resistance
RST Release Threshold
RST Detect Threshold
RST Hysteresis
RSTB Output low voltage
RSTB Output high voltage
Minimum start-up voltage
Minimum input voltage after
start-up
Over current protection
OVP Detect Threshold
Discharge Resistance
(Note 1) 3.3KΩ resistive load, 3.3Vout(1mA)
Symbol
ICC1
ICC2
ICC3
Fsw
Vout
Imax1
Imax2
VIH_EN
VIL_EN
Rswn
Rswp
VrstR
VrstD
RSTHys
Vol
Voh
Vmin
Vminaft
OCP
OVPD
RDIS
Min.
-
-
-
720
3.262
50
500
0.6
-
-
-
1.868
-
-
-
VIN-0.5
0.875
-
1.3
5.5
-
Typ.
2.7
7
13
800
3.3
-
-
-
-
140
330
1.9
1.5
0.4
0
-
0.9
0.26
1.55
6
90
Max.
8.0
18
25
880
3.343
-
-
-
0.2
-
-
1.930
-
-
0.1
-
0.925
0.6
1.8
6.5
-
Unit
μA
μA
μA
KHz
V
mA
mA
V
V
mΩ
mΩ
V
V
V
V
V
V
V
A
V
Ω
Condition
EN=0V, VIN=1.2V
EN=H,MODE=L,
device not switching
EN=H,MODE=H,
device not switching
Io=1mA
MODE=L, VIN=1.8V
MODE=H, VIN=1.8V
Isink=20μA, VIN=0.9V
Isource=1mA
(Note 1)
VOUT rising
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BU33UV7NUX
Typical Performance Curves(Unless otherwise indicated, V
IN
=2.4V,V
OUT
=3.3V,L0=4.7uH,C1=22
μF
×2,Ta=25°C)
100
90
80
70
60
50
40
30
20
10
0
0.01
0.1
1
Output Current [mA]
10
100
100
90
80
70
3.3V
3.0V
2.4V
1.8V
1.5V
1.2V
0.9V
Efficiency [%]
Efficiency [%]
60
50
40
30
3.3V
3.0V
2.4V
1.8V
1.5V
1.2V
0.9V
0.01
0.1
1
10
100
1000
20
10
0
Output Current [mA]
Figure 5. Efficiency vs Output Current
(“Efficiency”, MODE=L:Fixed PFM)
Figure 6. Efficiency vs Output Current
(“Efficiency”, MODE=H:Auto-PFM/PWM)
4.3
4.1
3.9
Output Voltage [V]
0.9V
1.8V
2.4V
3.3V
Output Voltage [mA]
4.3
0.9V
4.1
3.9
3.7
3.5
3.3
3.1
2.9
2.7
2.5
2.3
1.8V
2.4V
3.3V
3.7
3.5
3.3
3.1
2.9
2.7
2.5
2.3
0
50
100
150
Output Current [mA]
200
0
100
200
300
400
500
Output Current [mA]
600
Figure 7. Output Voltage vs Output Current
(“Load Regulation”, MODE=L:Fixed PFM)
Figure 8. Output Voltage vs Output Current
(“Load Regulation”, MODE=H:Auto-PFM/PWM)
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