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PDF BD35221EFV Data sheet ( Hoja de datos )
| Número de pieza | BD35221EFV | |
| Descripción | Ultra Low Dropout Linear Regulators | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
1.25V to VCC-1V, 4A 1ch
Ultra Low Dropout Linear Regulator
BD35221EFV
General Description
BD35221EFV is an ultra low-dropout linear chipset
regulator that operates from a very low input supply, It
offers ideal performance in low input voltage to low
output voltage applications. The input-to-output voltage
difference is minimized by using a built-in N-Channel
power MOSFET with a maximum ON-Resistance of
RON =50mΩ(Max). By lowering the dropout voltage, the
regulator achieves high output current of up to
(IOUTMAX=4.0A), thereby, reducing conversion loss,
making it comparable to a switching regulator and its
power transistor, choke coil, and rectifier diode
constituents. It is a low-cost design and is available in
significantly downsized package profiles.
Key Specifications
IN Input Voltage Range:
VCC Input Voltage Range:
Output Voltage Setting Range:
Output Current:
ON-Resistance:
Standby Current:
Operating Temperature Range:
1.25V to VCC-1V
4.3V to 5.5V
1.2V (fixed)
4.0A (Max)
28mΩ(Typ)
0µA (Typ)
-10°C to +100°C
Package
W(Typ) x D(Typ) x H(Max)
Features
Internal High-Precision Output Voltage Circuit
(1.20V±1%)
Built-in VCC Undervoltage Lockout Circuit
(VCC=3.80V)
NRCS (Soft start) Function Reduces the Magnitude
of In-rush Current
Internal N-Channel MOSFET Driver Offers low
ON-Resistance
Built-in Short Circuit Protection (SCP)
Built-in Current Limit Circuit (4.0A min)
Built-in Thermal Shutdown (TSD) Circuit
Tracking Function
Typical Application Circuit and Block Diagram
VCC
HTSSOP-B20
6.50mm x 6.40mm x 1.00mm
Applications
Notebook computers, Desktop computers, LCD-TV,
DVD, Digital appliances
VCC
11
EN
12
Reference
Block
NRCS x 0.3
VREF x 0.4
FB
SCP
13
CSCP
TSD
NRCS
8
CNRCS EN/UVLO
C1
VREF
UVLO2
VIN
UVLO LATCH
VCC
EN
UVLO1
UVLO1
CL
VCC VREF
X 0.7
Current
Limit
VCC
NRCS
SCP/TSD LATCH
LATCH
EN
UVLO1
CL
UVLO1
UVLO2
TSD
SCP
EN
NRCS
VD
14
R2
R1
R2
R1
IN
15
16
17
18
19
20
OUT
1
2
3
4
5
6
VOS
FB
7
IN
C2
OUT
CFB
C3
9 10
GND
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has no designed protection against radioactive rays
1/22
TSZ02201-0J2J0A601020-1-2
02.Nov.2015 Rev.001
1 page  
BD35221EFV
Typical Waveforms
VOUT
50mV/div
49mV
IOUT
2A/div
4.0A
IOUT=0A to 4A/4μsec
t(10μsec/div)
Figure 1. Transient Response
(0A to 4A)
COUT=22μF, CFB=1000pF
VOUT
50mV/div
59mV
IOUT
2A/div
4.0A
IOUT=0A to 4A/4μsec
t(10μsec/div)
Figure 2. Transient Response
(0A to 4A)
COUT=100μF
VOUT
50mV/div
46mV
IOUT
2A/div
4.0A
IOUT=0A to 4A/4μsec
t(10μsec/div)
Figure 3. Transient Response
(0A to 4A)
COUT=100μF, CFB=1000pF
VOUT
50mV/div 42mV
IOUT
2A/div
4.0A
IOUT=4A to 0A/4μsec
t(100μsec/div)
Figure 4. Transient Response
(4A to 0A)
COUT=22μF, CFB=1000pF
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/22
TSZ02201-0J2J0A601020-1-2
02.Nov.2015 Rev.001
5 Page 
BD35221EFV
Timing Chart
EN ON/OFF
IN
VCC
EN
NRCS
OUT
0.65V (typ)
Startup
VCC ON/OFF
IN
VCC
EN
NRCS
OUT
UVLO
0.65V (typ)
Startup
t
Hysteresis
t
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/22
TSZ02201-0J2J0A601020-1-2
02.Nov.2015 Rev.001
11 Page | ||
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| PDF Descargar | [ Datasheet BD35221EFV.PDF ] | |
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