Datasheet
Power Supply IC for High Fidelity Audio
Negative Voltage Linear Regulator for
High Fidelity Audio
BD37215MUV
General Description
BD37215MUV is a linear regulator of low noise
(5.1µVrms) which is most suitable to high quality audio
system. It operates at -16V to -3V and capable of
supplying a maximum load of 1000mA.
In addition to the low noise, BD37215MUV has a high
PSRR and good input transient fluctuation
characteristic which makes it suitable for the
stabilization of DC/DC converter output, and an ideal
power supply to high precision analog circuits such as
operational amplifier and headphone amplifier for
audio.
Furthermore, when BD37215MUV is placed in standby
mode, the supply current can be as small as
9.2µA(Typ) which can greatly reduce power consump-
tion.
Key Specifications
■
■
■
■
■
■
■
■
Input Voltage Range:
-16.0V to -3.0V
Output Voltage Range:
-15.0V to -1.0V
Output Current:
1.0A(Max)
Output Voltage Noise
(Note 1)
:
5.1µVrms(10Hz to 100kHz, Typ)
PSRR
(Note 2)
: 90dB(1kHz, Typ), 55dB(1MHz, Typ)
Input Transient Response:
3mV(1.0V/µs, Typ)
Standby Current:
9.2µA(Typ)
Operating Temperature Range: -40°C to +85°C
(Note 1)
C
BC
=10µF, V
OUT
= -1.0V, I
OUT
=0.5A setting
(Note 2)
C
OUT
=47µF, V
OUT
= -1.0V, I
OUT
=0.5A setting
Package
VQFN020V4040
W(Typ) x D(Typ) x H(Max)
4.00mm x 4.00mm x 1.00mm
Features
■
■
■
■
Ultra Low Noise, High PSRR
Standby Mode controlled by Enable Pin
using the positive voltage
Soft Start Function controlled by External
Capacitor
Under Voltage Lockout Protection, Over Current
Protection, Thermal Shutdown Protection
VQFN020V4040
Applications
■
■
High Quality Audio Equipment
Power Supply for Operational Amplifier and Head-
phone Amplifier
Typical Application Circuit
Switching
Regulator
V
IN
= -6.0V
C
IN
10µF EN
V
EN
= +3.0V
R
2
30kΩ
R
1
120kΩ
VIN
VO
VS
BC
GND
V
OUT
= -5.0V
C
OUT
10µF
C
BC
1µF
Amplifier
Headphone
Amplifier
BAS
BAO
Figure 1. Basic Application Circuit Diagram (V
OUT
= -5.0V)
〇Product
structure : Silicon monolithic integrated circuit
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〇This
product has no designed protection against radioactive rays
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TSZ02201-0V3V0A600120-1-2
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BD37215MUV
Pin Configuration
(TOP VIEW)
12.BAO
11.BAS
15.VIN
14.NC
13.NC
16.VIN
17.VIN
18.NC
19.VO
20.VO
EXP-PAD
10.NC
9.NC
8.EN
7.GND
6.NC
1.VO
3.NC
4.NC
Figure 2. Pin Configuration
Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
-
Pin Name
VO
VS
NC
NC
BC
NC
GND
EN
NC
NC
BAS
BAO
NC
NC
VIN
VIN
VIN
NC
VO
VO
EXP-PAD
Output voltage
Output voltage feedback
No connect
(Note 3)
No connect
(Note 3)
Bypass capacitor pin connected to ground
No connect
(Note 3)
Ground
Enable
No connect
(Note 3)
No connect
(Note 3)
Programmed voltage feedback
Programmed voltage output
No connect
(Note 3)
No connect
(Note 3)
Input voltage
Input voltage
Input voltage
No connect
(Note 3)
Output voltage
Output voltage
The exposed pad should be connected to VIN
pattern.
Function
(Note 3)
The NC PINs should not be connected to any pattern or should be connected to GND.
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5.BC
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BD37215MUV
Block Diagram
EN
8
OCP , TSD ,
UVLO
2
BG
1
100kΩ
REF
AMP
BC
CHARGE
ERR
AMP
19
20
VS
VO
VO
VO
7
GND
11
BAS
12
BAO
5
BC
15
VIN
16
VIN
17
VIN
Figure 3. Block Diagram
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BD37215MUV
Description of Block
1.
Enable
Assuming EN is set to L, the IC can be set to standby state. In standby state, the output is OFF and since it will be in
static state, the power consumption can be reduced. It is unavailable to input the negative voltage to EN.
Rising, Falling, and EN Controlled Timing
0V
V
IN
-0.9V(Typ)
-2.45V(Typ)
-2.30V(Typ)
-2.45V(Typ)
-2.30V(Typ)
2.
+1.8V(Typ)
+1.6V(Typ)
EN
UVLO
(internal
signal)
OUTPUT
DISABLE
(internal
signal)
V
OUT
85%
85%
0V
H
L
H
L
0V
-1.0V
0V
BC
85%
85%
-1.0V
9ms
9ms
EN OFF
EN ON
UVLO
UVLO
UVLO
UVLO
detect
release
detect
release
Figure 4. The Sequence Waveform During V
IN
/EN Rising and Falling
(When at Capacitance of C
BC
1µF and Output -1.0V Settings)
time
It will operate if EN is H and UVLO (Under Voltage Lockout) is released. In addition, when EN is L or UVLO is detected,
the regulator operation stops.
V
IN
does not have the necessity to supply earlier than EN.
The maximum slew rate of input voltage has to be set 1.0V/µs or below.
3.
Soft Start Function
In BD37215MUV, there exists a function that limits the rising speed of output when EN rises by the capacitor connected
to BC due to decrease of inrush current of output. The rising speed depends on the internal charging current
100µA(Typ), the capacitance value connected to BC and on the output programmed voltage. It is about 9ms (Typ) if
capacitance of C
BC
is 1µF and output programmed voltage is -1.0V, and almost 40ms (Typ) if output programmed
voltage is set to -5.0V. The above is an aim level, and soft start time may change depending on the input and output
voltage condition.
REFAMP
REFAMP sets its output voltage. Refer Selection of Components Externally Connected (Page 16) about setting of output
voltage.
BC
Noise at the output voltage of REFAMP is reduced because of the internal resistor 100kΩ and the external BC capacitor.
In addition to it, the external BC capacitor also has a soft start function so the rising speed can be adjusted by this value.
The higher value of capacitor will decrease the noise but the soft start time will be longer.
ERRAMP
The ERRAMP outputs the voltage set in REFAMP at 1 time of closed gain. VS must be connected to VO by all means. In
addition, VS can decrease a voltage drop by the pattern resistance on the VO course by returning the voltage from the
supply point.
4.
5.
6.
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BD37215MUV
Absolute Maximum Rating (Ta = 25°C)
Parameter
Power Supply Voltage
(PIN 15, 16, 17)
EN Pin Voltage (PIN 8)
Pin Voltage (PIN 11)
Pin Voltage (PIN 1, 2, 5, 12, 19, 20)
Storage Temperature Range
Maximum Junction Temperature
Symbol
V
IN
V
EN
V
PIN1
V
PIN2
Tstg
Tjmax
Rating
-17.5 to +0.3
-0.3 to +7.0
-7.0 to +0.3
-17.5 to +0.3
-55 to +150
150
Unit
V
V
V
V
°C
°C
Caution 1:
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.
Caution 2:
Should by any chance the maximum junction temperature rating be exceeded the rise in temperature of the chip may result in deterioration of the
properties of the chip. In case of exceeding this absolute maximum rating, increase the board size and copper area to prevent exceeding the
maximum junction temperature rating.
Thermal Resistance
(Note 4)
Parameter
VQFN020V4040
Junction to Ambient
Junction to Top Characterization Parameter
(Note 5)
θ
JA
Ψ
JT
153.90
13.00
37.40
7.00
°C/W
°C/W
Symbol
Thermal Resistance (Typ)
1s
(Note 6)
2s2p
(Note 7)
Unit
(Note 4)
Based on JESD51-2A(Still-Air)
(Note 5)
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 6)
Using a PCB board based on JESD51-3.
Layer Number of
Measurement Board
Single
Top
Copper Pattern
Footprints and Traces
Material
FR-4
Board Size
114.3mm x 76.2mm x 1.57mmt
Thickness
70µm
(Note 7)
Using a PCB board based on JESD51-5, 7.
Layer Number of
Measurement Board
4 Layers
Top
Copper Pattern
Footprints and Traces
Material
FR-4
Board Size
114.3mm x 76.2mm x 1.6mmt
2 Internal Layers
Thermal Via
(Note 8)
Pitch
1.20mm
Bottom
Copper Pattern
74.2mm (Square)
Thickness
70µm
35µm
Diameter
Φ0.30mm
Thickness
70µm
Copper Pattern
74.2mm (Square)
Thickness
(Note 8)
This thermal via connects with the copper pattern of all layers.
Recommended Operating Conditions
Parameter
Power Supply Voltage
Output Voltage Setting is within a
Possible Range
Output Current
(Note 9)
Operating Temperature
(Note 9)
Tjmax should not be exceeded.
Symbol
V
IN
V
OUT
I
OUT
Topr
Min
-16.0
-15.0
-
-40
Typ
-
-
-
+25
Max
-3.0
-1.0
1.0
+85
Unit
V
V
A
°C
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