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BD3523HFN-TR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
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2009.04 - Rev.B
© 2009 ROHM Co., Ltd. All rights reserved.
Hi-performance Regulator IC Series for PCs
Nch FET Ultra LDOs
for Desktop PCs
BD3523HFN, BD35230HFN, BD35231HFN
●Description
The BD3523HFN, BD35230HFN, BD35231HFN 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 (R
ON=150mΩ) level. By
lowering the dropout voltage in this way, the regulator realizes high current output (Iomax=2.0A) with reduced conversion
loss, and thereby obviates the switching regulator and its power transistor, choke coil, and rectifier diode. Thus, the
BD3523HFN, BD35230HFN, BD35231HFN designed to enable significant package profile downsizing and cost reduction. In
BD3523HFN, 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) Internal high-precision output voltage circuit <BD35230HFN/BD35231HFN>
3) Built-in VCC undervoltage lockout circuit (VCC=3.80V)
4) NRCS (soft start) function reduces the magnitude of in-rush current
5) Internal Nch MOSFET driver offers low ON resistance (100mΩ typ)
6) Built-in short circuit protection (SCP)
7) Built-in current limit circuit (2.0A min)
8) Built-in thermal shutdown (TSD) circuit
9) Variable output (0.65～2.7V) <BD3523HFN>
10) High-power package HSON8 : 2.9mm×3.0mm×0.6mm
11) Tracking function
●Applications
Notebook computers, Desktop computers, LCD-TV, DVD, Digital appliances
●Line-up
Maximum Output Voltage Package Product name
Adjustable (0.65～2.7V)
HSON8
BD3523HFN
1.0V (fixed) BD35230HFN
1.2V (fixed) BD35231HFN
No.09030EBT01
BD3523HFN, BD35230HFN, BD35231HFN
Technical Note
2/20
www.rohm.com
2009.04 - Rev.B
© 2009 ROHM Co., Ltd. All rights reserved.
●Absolute maximum ratings
Parameter Symbol
Limit
Unit
BD3523HFN BD35230HFN BD35231HFN
Input Voltage 1
VCC +6.0
*1
V
Input Voltage 2
VIN +6.0
*1
V
Maximum Output Current
IO 2
*1
A
Enable Input Voltage
VEN -0.3～+6.0 V
Power Dissipation 1
Pd1 0.63
*2
W
Power Dissipation 2
Pd2 1.35
*3
W
Power Dissipation 3
Pd3 1.75
*4
W
Operating Temperature Range
Topr -10～+100 ℃
Storage Temperature Range
Tstg -55～+125 ℃
Maximum Junction Temperature
Tjmax +150 ℃
*1 Should not exceed Pd.
*2 Reduced by 5.04mW/℃ for each increase in Ta≧25℃ (when mounted on a 70mm×70mm×1.6mm glass-epoxy board, 1-layer,
copper foil area : less than 0.2%)
*3 Reduced by 10.8mW/℃ for each increase in Ta≧25℃ (when mounted on a 70mm×70mm×1.6mm glass-epoxy board, 1-layer,
copper foil area : less than 7.0%)
*4 Reduced by 14.0mW/℃ for each increase in Ta≧25℃ (when mounted on a 70mm×70mm×1.6mm glass-epoxy board, 1-layer,
copper foil area : less than 65.0%)
●Operating Voltage(Ta=25℃)
Parameter Symbol
BD3522EFV BD35221EFV
BD35222EFV
Unit
Min. Max. Min. Max. Min. Max.
Input Voltage 1 VCC 4.3 5.5 4.3 5.5 4.3 5.5 V
Input Voltage 2 VIN 0.95 VCC-1
*5
1.3 VCC-1
*5
1.5 VCC-1
*5
V
Output Voltage Setting Range IO VFB 2.7 1.0 (fixed) 1.2 (fixed) V
Enable Input Voltage VEN -0.3 5.5 -0.3 5.5 -0.3 5.5 V
NRCS Capacity CNRCS 0.001 1 0.001 1 0.001 1 μF
*5 VCC and VIN do not have to be implemented in the order listed.
*This product is not designed for use in radioactive environments.
BD3523HFN, BD35230HFN, BD35231HFN
Technical Note
3/20
www.rohm.com
2009.04 - Rev.B
© 2009 ROHM Co., Ltd. All rights reserved.
●Electrical Characteristics
BD3523HFN (Unless otherwise specified, Ta=25℃, VCC=5V, VEN=3V, VIN=1.7V, R1=3.9kΩ, R2=3.3kΩ)
Parameter Symbol
Limit
Unit Condition
Min. Typ. Max.
Bias Current ICC - 0.7 1.2 mA
VCC Shutdown Mode Current IST - 0 10 μA
V
EN
=0V
Output Voltage IO 2.0 - - A
Feedback Voltage 1 VFB1 0.643 0.650 0.657 V
Feedback Voltage 2 VFB2 0.637 0.650 0.663 V
Tj=-10 to 100℃
Line Regulation 1 Reg.l1 - 0.1 0.5 %/V
V
CC
=4.3V to 5.5V
Line Regulation 2 Reg.l2 - 0.1 0.5 %/V
V
IN
=1.2V to 3.3V
Load Regulation Reg.L - 0.5 10 mV
I
O
=0 to 2A
Output ON Resistance RON - 100 150 mΩ
I
O
=2A,V
IN
=1.2V, Tj=-10 to 100℃
Standby Discharge Current IDEN 1 - - mA
V
EN
=0V, V
O
=1V
[ENABLE]
Enable Pin Input Voltage High ENHIGH 2 - - V
Enable Pin Input Voltage Low ENLOW 0 - 0.8 V
Enable Input Bias Current IEN - 7 10 μA
V
EN
=3V
[FEEDBACK]
Feedback Pin Bias Current IFB -100 0 100 nA
[NRCS]
NRCS Charge Current INRCS 12 20 28 μA
NRCS Standby Voltage VSTB - 0 50 mV
V
EN
=0V
[UVLO]
VCC Undervoltage Lockout
Threshold Voltage
V
CCUVLO 3.5 3.8 4.1 V
V
CC
:Sweep-up
VCC Undervoltage Lockout
Hysteresis Voltage
V
CChys 100 160 220 mV
V
CC
:Sweep-down
VINUndervoltage Lockout
Threshold Voltage
V
INUVLO 0.55 0.65 0.75 V
V
IN
:Sweep-up
[SCP]
SCP Start up Voltage VOSCP VO×0.3 VO×0.4 VO×0.5 V
SCP Threshold Voltage TSCP 45 90 200 μsec
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

BD3523HFN-TR

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Description:
LDO Voltage Regulators LDO REG 0.65V-2.7V 2A 8PIN
Lifecycle:
New from this manufacturer.
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