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Número de pieza | BD3540NUV | |
Descripción | Nch FET Ultra LDOs | |
Fabricantes | ROHM Semiconductor | |
Logotipo | ||
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No Preview Available ! Hi-performance Regulator IC Series for PCs
Nch FET Ultra LDOs
for Desktop PCs Chipsets with Power Good
BD3540NUV, BD3541NUV
No.09030EBT04
●Description
The BD3540NUV, BD3541NUV low-voltage output linear 1ch series chipset regulator IC 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=200mΩ~
400mΩ) level. By lowering the dropout voltage in this way, the regulator realizes high current output (Iomax=0.5A~1.0A)
with reduced conversion loss, and thereby obviates the switching regulator and its power transistor, choke coil, and rectifier
diode. Thus, the BD3540NUV, BD3541NUV are 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) High-precision voltage regulator(0.65V±1%)
2) Built-in VCC undervoltage lockout circuit
3) NRCS (soft start) function reduces the magnitude of in-rush current
4) Internal Nch MOSFET driver offers low ON resistance
5) Built-in current limit circuit
6) Built-in thermal shutdown (TSD) circuit
7) Variable output
8) Small package VSON010V3030 : 3.0×3.0×1.0(mm)
9) Tracking function
●Applications
Notebook computers, Desktop computers, LCD-TV, DVD, Digital appliances
●Line-up
It is available to select power supply voltage and maximum output voltage.
Maximum Output Voltage
Package
Vcc=5V
0.5A
1.0A
VSON010V3030
BD3540NUV
BD3541NUV
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© 2009 ROHM Co., Ltd. All rights reserved.
1/16
2009.04 - Rev.B
1 page BD3540NUV, BD3541NUV
●Reference Data(BD3540NUV)
VCC
Ven
VIN
Fig.19 Waveform at output
start
VCC
VCC
Ven
VIN
Ven
VIN
Vo
Fig.20 Waveform at output OFF
Technical Note
Fig.21 Input sequence
VCC
Ven
VIN
Vo
VCC
Ven
VIN
Vo
VCC
Ven
VIN
Vo
Fig.22 Input sequence
Fig.23 Input sequence
VCC
VCC
Ven Ven
VIN VIN
Vo
VIN→Ven→VCC
Fig.25 Input sequence
Vo
Ven→VIN→VCC
Fig.26 Input sequence
Fig.24 Input sequence
1.25
1.23
1.21
1.19
1.17
1.15
-10 10 30 50 70 90
Ta(℃)
Fig.27 Ta-Vo (Io=0mA)
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© 2009 ROHM Co., Ltd. All rights reserved.
5/16
2009.04 - Rev.B
5 Page BD3540NUV, BD3541NUV
Technical Note
●Recommended Circuit Example
VCC
1
C1
2
VCC
EN
R4
3
R5 4
C6 5
10
GND
9
8
7 R2
6
R1
FB
C5
C4
VOUT1(1.2V)
C3
VIN C2
Component
Recommended
Value
Programming Notes and Precautions
R1/R2
C3
C1
C2
C4
3.9k/3.3k
22μF
1μF
22μF
0.01μF
IC output voltage can be set with a configuration formula using the values for the internal
reference output voltage (VFB)and the output voltage resistors (R1, R2). Select resistance
values that will avoid the impact of the VREF current (±100nA). The recommended total
resistance value is 10KΩ.
To assure output voltage stability, please be certain the VOUT1 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 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 22μF 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.
C5
-
This component is employed when the C3 capacitor causes, or may cause, oscillation. It
provides more precise internal phase correction.
R5
100k
It is pull-up resistance of Open Drain pin. 100kΩ is recommended.
R4 Several kΩ It is recommended that a resistance (several kΩ to several 10kΩ) be put in R4, in case
~several 10kΩ negative voltage is applied in EN pin.
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
11/16
2009.04 - Rev.B
11 Page |
Páginas | Total 19 Páginas | |
PDF Descargar | [ Datasheet BD3540NUV.PDF ] |
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