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BD3512MUV 데이터시트 PDF




ROHM Semiconductor에서 제조한 전자 부품 BD3512MUV은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 BD3512MUV 기능
기능 Ultra Low Dropout Linear Regulators
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BD3512MUV 데이터시트, 핀배열, 회로
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 (0.652.7V)
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




BD3512MUV pdf, 반도체, 판매, 대치품
Reference Data
Vo
50mV/div
Vo
50mV/div
Vo
50mV/div
Io
1A/div
3.0A
Io=0A3A/3μsec
T(10μsec/div)
Fig.1 Transient Response
(03A)
Co=22μF, Cfb=1000pF
Io
1A/div
3.0A
Io
1A/div
3.0A
Io=0A3A/3μsec
T(4μsec/div)
Fig.2 Transient Response
(03A)
Co=100μF
Io=0A3A/3μsec
T(4μsec/div)
Fig.3 Transient Response
(03A)
Co=100μF, Cfb=1000pF
Vo
50mV/div
Vo
50mV/div
Vo
50mV/div
Io
1A/div
3.0A
Io
1A/div
3.0A
Io=3A0A/3μsec
T(40μsec/div)
Fig.4 Transient Response
(30A)
Co=22μF, Cfb=1000pF
Io=3A0A/3μsec
T(100μsec/div)
Fig.5 Transient Response
(30A)
Co=100μF
Ven
2V/div
VNRCS
1V/div
Ven
2V/div
VNRCS
1V/div
Vo
500mV/div
Vo
500mV/div
T(100μsec/div)
Fig.7 Waveform at output start
T(2msec/div)
Fig.8 Waveform at output OFF
Io
1A/div
3.0A
Io=3A0A/3μsec
T(100μsec/div)
Fig.6 Transient Response
(30A)
Co=100μF, Cfb=1000pF
VCC
5V/div
Ven
2V/div
VIN
2V/div
Vo
1V/div
VCCVINVen
Fig.9 Input sequence
VCC
5V/div
Ven
2V/div
VIN
2V/div
Vo
1V/div
VINVCCVen
Fig.10 Input sequence
VCC
5V/div
Ven
2V/div
VIN
2V/div
Vo
1V/div
VenVCCVIN
Fig.11 Input sequence
VCC
5V/div
Ven
2V/div
VIN
2V/div
Vo
1V/div
VCCVenVIN
Fig.12 Input sequence
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BD3512MUV 전자부품, 판매, 대치품
Operation of Each Block
AMP
This is an error amp compares the reference voltage (0.65V) with VO to drive the output Nch FET (Ron=50mΩ). Frequency
optimization helps to realize rapid transient response, and to support the use of ceramic capacitors on the output. AMP input
voltage ranges from GND to 2.7V, while the AMP output ranges from GND to VCC. When EN is OFF, or when UVLO is active,
output goes LOW and the output of the NchFET switches OFF.
EN
The EN block controls the regulator’s ON/OFF state via the EN logic input pin. In the OFF position, circuit voltage is
maintained at 0μA, thus minimizing current consumption at standby. The FET is switched ON to enable discharge of the
NRCS pin VO, thereby draining the excess charge and preventing the IC on the load side from malfunctioning. Since no
electrical connection is required (e.g. between the VCC pin and the ESD prevention diode), module operation is independent
of the input sequence.
UVLO
To prevent malfunctions that can occur during a momentary decrease in VCC, the UVLO circuit switches the output OFF,
and (like the EN block) discharges NRCS and VO. Once the UVLO threshold voltage (TYP3.80V) is reached, the power-on
reset is triggered and output continues.
CURRENT LIMIT
When output is ON, the current limit function monitors the internal IC output current against the parameter value. When
current exceeds this level, the current limit module lowers the output current to protect the load IC. When the overcurrent
state is eliminated, output voltage is restored to the parameter value.
NRCS (Non Rush Current on Start-up)
The soft start function enabled by connecting an external capacitor between the NRCS pin and ground. Output ramp-up
can be set for any period up to the time the NRCS pin reaches VFB (0.65V). During startup, the NRCS pin serves as a 20μ
A (TYP) constant current source to charge the external capacitor. Capacitors with low susceptibility (0.001μF1μF) to
temperature are recommended, in order to assure a stable soft-start time.
TSD (Thermal Shut down)
The shutdown (TSD) circuit automatically is latched OFF when the chip temperature exceeds the threshold temperature
after the programmed time period elapses, thus serving to protect the IC against “thermal runaway” and heat damage.
Because the TSD circuit is intended to shut down the IC only in the presence of extreme heat, it is crucial that the Tj (max)
parameter not be exceeded in the thermal design, in order to avoid potential problems with the TSD.
VIN
The VIN line acts as the major current supply line, and is connected to the output NchFET drain. Since no electrical
connection (such as between the VCC pin and the ESD protection diode) is necessary, VIN operates independent of the input
sequence. However, since an output NchFET body diode exists between VIN and VO, a VIN-VO electric (diode) connection is
present. Note, therefore, that when output is switched ON or OFF, reverse current may flow to VIN from VO.
PGOOD
It outputs the status of the output voltage. This is open drain pin and connects to VCC pin through the pull-up resistance
(100kΩ or so). When the output voltage range is VO×0.9 to VO×1.1(TYP), the status is high.
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BD3512MUV

Ultra Low Dropout Linear Regulators

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