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PDF BD8305MUV Data sheet ( Hoja de datos )

Número de pieza BD8305MUV
Descripción High-effciency Step-up/down Switching Regulators
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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Single-chip Type with Built-in FET Switching Regulator Series
High-efficiency Step-up/down
Switching Regulators
with Built-in Power MOSFET
BD8305MUV
No.10027EDT08
Description
ROHM’s highly-efficient step-up/down switching regulator BD8305MUV produces step-up/down output including 3.3 V from
1 cell of lithium battery with just one coil.This IC adopts an original step-up/down drive system and creates a higher efficient
power supply than conventional Sepic-system or H-bridge system switching regulators.
Features
1) Highly-efficient step-up/down DC/DC converter to be constructed just with one inductor.
2) Input voltage
2.5 V - 5.5 V
3) Output current
1 A at 3.3 V
800 mA at 5.0 V
4) Incorporates soft-start function.
5) Incorporates timer latch system short protecting function.
6) High heat radiation surface mounted package
VQFN020V4040
Application
General portable equipment like portable audio or DSC/DVC
Absolute Maximum Ratings
Parameter
Symbol
BD8305MUV
Unit
Maximum applied power voltage
Vcc,PVCC
7.0
V
Maximum input current
Iinmax
2.0 A
Maximum input voltage
Lx1 7.0 V
Lx2 7.0 V
Power dissipation
Pd 700 mW
Operating temperature range
Topr
-25 to +85
ºC
Storage temperature range
Tstg
-55 to +150
ºC
Junction temperature
Tjmax
150 ºC
*1 When installed on a 70.0 mm × 70.0 mm × 1.6 mm glass epoxy board. The rating is reduced by 5.6 mW/°C at Ta = 25°C or more.
Operating Conditions (Ta = 25°C)
Parameter
Power supply voltage
Output voltage
Symbol
Vcc
OUT
Voltage range
2.5 to 5.5
2.8 to 5.2
Unit
V
V
www.rohm.com
c 2010 ROHM Co., Ltd. All rights reserved.
1/15
2010.05 - Rev.D

1 page




BD8305MUV pdf
BD8305MUV
Reference Data
(Unless otherwise specified, Ta = 25°C, VCC = 3.7 V)
Technical Note
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0.810
0.805
0.800
0.795
VCC=2.4V
VCC=3.7V
VCC=7.0V
VCC=5.5V
0.790
-50
0 50 100
TEMPERATURE [℃]
Fig.3 INV threshold
150
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
2
345
VCC [℃]
6
Fig.6 Oscillation frequency
(power supply property)
0.810
0.805
UVLO
0.800
0.795
0.790
0.0 2.0 4.0 6.0 8.0
VCC [V]
Fig.4 INV threshold (power supply property)
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
-50 0
50 100
TEMPERATURE [℃]
Fig.5 Oscillation frequency
150
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
-50
RESET
DETECT
0 50 100
TEMPARATURE [℃]
150
Fig.7 UVLO threshold
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
INV=1.1V
1 23
FB VOLTAGE [V]
Fig.8 FB sink current
4
0
INV=0.5V
-5
-10
-15
-20
-25
-30
-35
-40
0.0
0.5 1.0 1.5
FB VOLTAGE [V]
2.0
Fig.9 FB source current
300
250
200
150
Io=500mA
VCC=2.0V VCC=3.0V
VCC=6.0V
VCC=3.7V
100
50
0
-60 -10 40 90 140
TEMPERATURE [℃]
Fig.10 Lx1 Pch FET ON resistance
300
Io=500mA
250
200
150
VCC=2.0V
VCC=3.0V
VCC=3.7V
VCC=6.0V
100
50
0
-60 -10 40 90 140
TEMPERATURE [℃]
Fig.11 Lx1 Nch FET ON resistance
www.rohm.com
c 2010 ROHM Co., Ltd. All rights reserved.
5/15
2010.05 - Rev.D

5 Page





BD8305MUV arduino
BD8305MUV
Technical Note
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(4) Output voltage setting
The internal reference voltage of the ERROR AMP is 0.8 V. Output voltage should be obtained by referring to Equation
(8) of Fig.32.
VOUT
R1 ERROR AMP
INV
R2
(R1+R2)
Vo= ×0.8 [V] ・・・ (8)
R2
VREF
0.8V
Fig. 32 Setting of feedback resistance
(5) Determination of phase compensation
Condition for stable application
The condition for feedback system stability under negative feedback is as follows:
- Phase delay is 135 °or less when gain is 1 (0 dB) (Phase margin is 45° or higher)
Since DC/DC converter application is sampled according to the switching frequency, the GBW of the whole system
(frequency at which gain is 0 dB) must be set to be equal to or lower than 1/5 of the switching frequency.
In summary, target property of applications is as follows:
- Phase delay must be 135°or lower when gain is 1 (0 dB) (Phase margin is 45° or higher).
- The GBW at that time (frequency when gain is 0 dB) must be equal to or lower than 1/5 of the switching frequency.
For this reason, switching frequency must be increased to improve responsiveness.
One of the points to secure stability by phase compensation is to cancel secondary phase delay (-180°) generated by LC
resonance by the secondary phase lead (i.e. put two phase leads).
Since GBW is determined by the phase compensation capacitor attached to the error amplifier, when it is necessary to
reduce GBW, the capacitor should be made larger.
C
GAIN
A
(A) -20dB/decade
[dB]
(B)
R0
FB
Fig.33 General integrator
Error AMP is a low-pass filter because phase compensation such as
(1) and (2) is performed. For DC/DC converter application, R is a
parallel feedback resistance.
0°
PHASE
[degree] -90°
Phase margin
-180°
Point (A) fp=
1
2πRCA
1
Point (B) fGBW= 2πRC
[Hz] (9)
[Hz] (10)
Fig.34 Frequency property of integrator
Phase compensation when output capacitor with low ESR such as ceramic capacitor is used is as follows:
When output capacitor with low ESR (several tens of m) is used for output, secondary phase lead (two phase leads)
must be put to cancel secondary phase lead caused by LC.One of the examples of phase compensation methods is as
follows:
www.rohm.com
c 2010 ROHM Co., Ltd. All rights reserved.
11/15
2010.05 - Rev.D

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