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PDF BD3512MUV Data sheet ( Hoja de datos )
| Número de pieza | BD3512MUV | |
| Descripción | Ultra Low Dropout Linear Regulators | |
| Fabricantes | ROHM Semiconductor | |
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TECHNICAL NOTE
High-performance Regulator IC Series for PCs
Ultra Low Dropout
Linear Regulators for PC Chipsets
with Power Good
BD3512MUV (3A)
● Description
The BD3512MUV ultra low-dropout linear chipset regulator operates from a very low input supply, and offers ideal
performance in low input voltage to low output voltage applications. It incorporates a built-in N-MOSFET power transistor to
minimize the input-to-output voltage differential to the ON resistance (RON=100mΩ) level. By lowering the dropout voltage in
this way, the regulator realizes high current output (Iomax=3.0A) with reduced conversion loss, and thereby obviates the
switching regulator and its power transistor, choke coil, and rectifier diode. Thus, the BD3512MUV is designed to enable
significant package profile downsizing and cost reduction. An external resistor allows the entire range of output voltage
configurations between 0.65 and 2.7V, while the NRCS (soft start) function enables a controlled output voltage ramp-up,
which can be programmed to whatever power supply sequence is required.
● Features
1) Internal high-precision reference voltage circuit (0.65V±1%)
2) Built-in VCC undervoltage lockout circuit (VCC=3.80V)
3) NRCS (soft start) function reduces the magnitude of in-rush current
4) Internal Nch MOSFET driver offers low ON resistance (65mΩ typ)
5) Built-in current limit circuit (3.0A min)
6) Built-in thermal shutdown (TSD) circuit (Timer latch)
7) Variable output (0.65～2.7V)
8) High-power package VQFN020V4040 : 4.0×4.0×1.0(mm)
9) Tracking function
● Applications
Notebook computers, Desktop computers, LCD-TV, DVD, Digital appliances
Oct. 2008
1 page  
●Reference Data
VCC
Ven
VIN
Vo
VIN→Ven→VCC
Fig.13 Input sequence
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
-50 -25
0 25 50 75 100 125 150
Tj [℃]
Fig.16 Tj-ICC
VCC
Ven
VIN
Vo
Ven→VIN→VCC
Fig.14 Input sequence
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-50 -25
0 25 50 75 100 125 150
Tj [℃]
Fig.17 Tj-ISTB
24
22
20
18
16
14
12
-50 -25 0 25 50 75 100 125 150
Tj [℃]
Fig.19 Tj-INRCS
10
9
8
7
6
5
4
3
2
1
0
-50 -25 0 25 50 75 100 125 150
Tj [℃]
Fig.20 Tj-IEN
80
70
60
50
40
30
20
10
0
-50 -25 0 25 50 75 100 125 150
Tj [℃]
Fig.22 Tj-RON
(VCC=5V/VO=1.5V)
50
Vo=2.5V
45
Vo=1.8V
Vo=1.7V
Vo=1.5V
Vo=1.2V
40
35
3
5
Vcc [V]
7
Fig.23 VCC-RON
5/16
1.23
1.22
1.21
1.20
1.19
1.18
1.17
-50
-25
0 25 50 75 100 125 150
Tj [℃]
Fig.15 Tj-Vo
50
45
40
35
30
25
20
15
10
5
0
-50
-25
0 25 50 75 100 125 150
Tj [℃]
Fig.18 Tj-IINSTB
80
70
60
50
40
30
20
10
0
-50 -25 0 25 50 75 100 125 150
Tj [℃]
Fig.21 Tj-RON
(VCC=5V/VO=1.2V)
5 Page 
●Recommended Circuit Example
Vo (1.2V/3A)
C16
CFB R18
R19
C20
15 14 13 12 11
16 10
17 9
18 8
19 7
20 6
12345
C2 C3 R4
VCC
VPGOOD
C9 VIN
R9
R8
C6 VCC
VEN
C5
Component
R18/R19
Recommended
Value
3.3k/3.9k
R4 100k
C16 22μF
C6/C5
1μF/0.1μF
C9 10μF
C20 0.01μF
CFB 1000pF
Programming Notes and Precautions
IC output voltage can be set with a configuration formula VFB×(R18+R19)/R19 using the
values for the internal reference output voltage (VFB) and the output voltage resistors (R18,
R19). Select resistance values that will avoid the impact of the FB bias current (±100nA).
The recommended total resistance value is 10KΩ.
This is the pull-up resistance for open drain pin. It is recommended to set the value about
100kΩ.
To assure output voltage stability, please be certain the Vo1～Vo5 pins and the GND pins
are connected. Output capacitors play a role in loop gain phase compensation and in
mitigating output fluctuation during rapid changes in load level. Insufficient capacitance
may cause oscillation, while high equivalent series reisistance (ESR) will exacerbate
output voltage fluctuation under rapid load change conditions. While a 22μF ceramic
capacitor is recomended, actual stability is highly dependent on temperature and load
conditions. Also, note that connecting different types of capacitors in series may result in
insufficient total phase compensation, thus causing oscillation. In light of this information,
please confirm operation across a variety of temperature and load conditions.
Input capacitors reduce the output impedance of the voltage supply source connected to
the (VCC) input pins. If the impedance of this power supply were to increase, input voltage
(VCC) could become unstable, leading to oscillation or lowered ripple rejection function.
While a low-ESR 1μF / 0.1μF capacitor with minimal susceptibility to temperature is
recommended, stability is highly dependent on the input power supply characteristics and
the substrate wiring pattern. In light of this information, please confirm operation across a
variety of temperature and load conditions.
Input capacitors reduce the output impedance of the voltage supply source connected to
the (VIN) input pins. If the impedance of this power supply were to increase, input voltage
(VIN) could become unstable, leading to oscillation or lowered ripple rejection function.
While a low-ESR 10 μ F capacitor with minimal susceptibility to temperature is
recommended, stability is highly dependent on the input power supply characteristics and
the substrate wiring pattern. In light of this information, please confirm operation across a
variety of temperature and load conditions.
The Non Rush Current on Startup (NRCS) function is built into the IC to prevent rush
current from going through the load (VIN to VO) and impacting output capacitors at power
supply start-up. Constant current comes from the NRCS pin when EN is HIGH or the
UVLO function is deactivated. The temporary reference voltage is proportionate to time,
due to the current charge of the NRCS pin capacitor, and output voltage start-up is
proportionate to this reference voltage. Capacitors with low susceptibility to temperature
are recommended, in order to assure a stable soft-start time.
This component is employed when the C16 capacitor causes, or may cause, oscillation. It
provides more precise internal phase correction.
11/16
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| PDF Descargar | [ Datasheet BD3512MUV.PDF ] | |
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