TECHNICAL NOTE
High-performance Regulator IC Series for PCs
Ultra Low Dropout
Linear Regulators(4A) for Desktop PC
BD3522EFV, BD35221EFV, BD35222EFV
●
Description
BD3522EFV / BD35221EFV / BD35222EFV 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
=50mΩ) level. By lowering the
dropout voltage in this way, the regulator realizes high current output (Iomax=4.0A) with reduced conversion loss, and
thereby obviates the switching regulator and its power transistor, choke coil, and rectifier diode. Thus, BD3522EFV /
BD35221EFV / BD35222EFV designed to enable significant package profile downsizing and cost reduction. In BD3522EFV,
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 <BD35221EFV/BD35222EFV>
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 (28mΩ typ)
6) Built-in short circuit protection (SCP)
7) Built-in current limit circuit (4.0A min)
8) Built-in thermal shutdown (TSD) circuit
9) Variable output (0.65½2.7V) <BD3522EFV>
10) High-power package HTSSOP-B20 : 6.5mm x 6.4mm x 1.0mm
11) Tracking function
●
Applications
Notebook computers, Desktop computers, LCD-TV, DVD, Digital appliances
●
Line-up
Maximum Output Voltage
Adjustable (0.65½2.7V)
1.2V (fixed)
1.5V (fixed)
Package
HTSSOP-B20
Product name
BD3522EFV
BD35221EFV
BD35222EFV
Oct. 2008
●Absolute
maximum ratings
Parameter
Input Voltage 1
Input Voltage 2
Maximum Output Current
Enable Input Voltage
Power Dissipation 1
Power Dissipation 2
Power Dissipation 3
Power Dissipation 4
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature
Symbol
VCC
VIN
IO
Ven
Pd1
Pd2
Pd3
Pd4
Topr
Tstg
Tjmax
BD3522EFV
Limit
BD35221EFV
6.0 *
1
6.0 *
1
4*
1
6.0
1.00
*2
1.45
*3
2.31
*4
3.20
*5
-10½+100
-55½+125
+150
BD35222EFV
Unit
V
V
A
V
W
W
W
W
℃
℃
℃
*1 Should not exceed Pd.
*2 Reduced by 8mW/℃ for each increase in Ta≧25℃ (when mounted on a 70mm×70mm×1.6mm glass-epoxy board, no copper foil area)
*3 Reduced by 11.6mW/℃ for each increase in Ta≧25℃ (when mounted on a 70mm×70mm×1.6mm glass-epoxy board, 2-layer,
copper foil area : 15mm×15mm)
*4 Reduced by 18.5mW/℃ for each increase in Ta≧25℃ (when mounted on a 70mm×70mm×1.6mm glass-epoxy board, 2-layer,
copper foil area : 70mm×70mm)
*5 Reduced by 25.6mW/℃ for each increase in Ta≧25℃ (when mounted on a 70mm×70mm×1.6mm glass-epoxy board, 4-layer,
copper foil area : 70mm×70mm)
●Operating
Voltage(Ta=25℃)
BD3522EFV
Min.
Max.
4.3
5.5
0.7
VCC-1 *
6
VFB
2.7
-0.3
5.5
0.001
1
BD35221EFV
Min.
Max.
4.3
5.5
1.25
VCC-1 *
6
1.2 (fixed)
-0.3
5.5
0.001
1
BD35222EFV
Min.
Max.
4.3
5.5
1.55
VCC-1 *
6
1.5 (fixed)
-0.3
5.5
0.001
1
Parameter
Input Voltage 1
Input Voltage 2
Output Voltage Setting Range
Enable Input Voltage
NRCS Capacity
Symbol
VCC
VIN
Vo
Ven
CNRCS
Unit
V
V
V
V
μF
*6 VCC and VIN do not have to be implemented in the order listed.
★This
product is not designed for use in radioactive environments.
2/20
●Electrical
Characteristics (Unless otherwise specified, Ta=25℃, VCC=5V, VEN=3V, VIN=1.7V, R1=3.9kΩ, R2=3.3kΩ)
BD3522EFV
Limit
Parameter
Symbol
Unit
Condition
Min.
Typ.
Max.
I
CC
-
1.4
2.2
mA
Bias Current
I
ST
-
0
10
μA
V
EN
=0V
VCC Shutdown Mode Current
I
O
4.0
-
-
A
Output Voltage
V
FB
1
0.643
0.650
0.657
V
Feedback Voltage 1
V
FB
2
0.637
0.650
0.663
V
Tj=-10 to 100℃
Feedback Voltage 2
REG.l1
-
0.1
0.5
%/V
V
CC
=4.3V to 5.5V
Line Regulation 1
REG.l2
-
0.1
0.5
%/V
V
IN
=1.2V to 3.3V
Line Regulation 2
REG.L
-
0.5
10
mV
I
O
=0 to 4A
Load Regulation
I
O
=4A,V
IN
=1.2V
Ron
-
28
50
mΩ
Output ON Resistance
Tj=-10 to 100℃
I
DEN
1
-
-
mA
V
EN
=0V, V
O
=1V
Standby Discharge Current
[ENABLE]
Enable Pin
Input Voltage High
Enable Pin
Input Voltage Low
Enable Input Bias Current
[FEEDBACK]
Feedback Pin Bias Current
[NRCS]
NRCS Charge Current
NRCS Standby Voltage
[UVLO]
VCC Undervoltage Lockout
Threshold Voltage
VCC Undervoltage Lockout
Hysteresis Voltage
VD Undervoltage Lockout
Threshold Voltage
[SCP]
SCP Start up Voltage
SCP Threshold Voltage
Charge Current
Standby Voltage
EN
HIGH
EN
LOW
I
EN
I
FB
I
NRCS
V
STB
2
-0.2
-
-100
12
-
-
-
6
0
20
0
-
0.8
10
100
28
50
V
V
μA
nA
μA
mV
V
EN
=3V
V
EN
=0V
V
CC
UVLO
V
CC
HYS
3.5
100
3.8
160
4.1
220
V
mV
V
V
CC
:Sweep-up
V
CC
:Sweep-down
V
D
:Sweep-up
V
D
UVLO V
REF
×0.6
V
REF
×0.7
V
REF
×0.8
V
OSCP
V
SCPTH
I
SCP
V
SCPSTBY
V
O
×0.3
1.05
2
-
V
O
×0.4
1.15
4
-
V
O
×0.5
1.25
6
50
V
V
μA
mV
V
FB
=0, V
GATE
=2.5V
V
FB
=VCC, V
GATE
=2.5V
3/20
●Electrical
Characteristics (Unless otherwise specified, Ta=25℃, V
CC
=5V, V
EN
=3V, V
IN
=1.7V)
BD35221EFV
Limit
Parameter
Symbol
Unit
Condition
Min.
Typ.
Max.
I
CC
-
1.4
2.2
mA
Bias Current
I
ST
-
0
10
μA
V
EN
=0V
VCC Shutdown Mode Current
I
O
4.0
-
-
A
Output Voltage
V
OS
1
1.188
1.200
1.212
V
Feedback Voltage 1
V
OS
2
1.176
1.200
1.224
V
Tj=-10 to 100℃
Feedback Voltage 2
REG.l1
-
0.1
0.5
%/V
V
CC
=4.3V to 5.5V
Line Regulation 1
REG.l2
-
0.1
0.5
%/V
V
IN
=1.25V to 3.3V
Line Regulation 2
REG.L
-
0.5
10
mV
I
O
=0 to 4A
Load Regulation
I
O
=4A,V
IN
=1.2V
Ron
-
28
50
mΩ
Output ON Resistance
Tj=-10 to 100℃
I
DEN
1
-
-
mA
V
EN
=0V, V
O
=1V
Standby Discharge Current
[ENABLE]
Enable Pin
Input Voltage High
Enable Pin
Input Voltage Low
Enable Input Bias Current
[NRCS]
NRCS Charge Current
NRCS Standby Voltage
[UVLO]
VCC Undervoltage Lockout
Threshold Voltage
VCC Undervoltage Lockout
Hysteresis Voltage
VD Undervoltage Lockout
Threshold Voltage
[SCP]
SCP Start up Voltage
SCP Threshold Voltage
Charge Current
Standby Voltage
EN
HIGH
EN
LOW
I
EN
I
NRCS
V
STB
2
-0.2
-
12
-
-
-
6
20
0
-
0.8
10
28
50
V
V
μA
μA
mV
V
EN
=3V
V
EN
=0V
V
CC
UVLO
V
CC
HYS
V
D
UVLO
3.5
100
V
O
×0.6
3.8
160
V
O
×0.7
4.1
220
V
O
×0.8
V
mV
V
V
CC
:Sweep-up
V
CC
:Sweep-down
V
D
:Sweep-up
V
OSCP
V
SCPTH
I
SCP
V
SCPSTBY
V
O
×0.3
1.05
2
-
V
O
×0.4
1.15
4
-
V
O
×0.5
1.25
6
50
V
V
μA
mV
V
FB
=0, V
GATE
=2.5V
V
FB
=VCC, V
GATE
=2.5V
4/20
●Electrical
Characteristics (Unless otherwise specified, Ta=25℃, V
CC
=5V, V
EN
=3V, V
IN
=1.7V)
BD35222EFV
Limit
Parameter
Symbol
Unit
Condition
Min.
Typ.
Max.
I
CC
-
1.4
2.2
mA
Bias Current
I
ST
-
0
10
μA
V
EN
=0V
VCC Shutdown Mode Current
I
O
4.0
-
-
A
Output Voltage
V
OS
1
1.485
1.500
1.515
V
Feedback Voltage 1
V
OS
2
1.470
1.500
1.530
V
Tj=-10 to 100℃
Feedback Voltage 2
REG.l1
-
0.1
0.5
%/V
V
CC
=4.3V to 5.5V
Line Regulation 1
REG.l2
-
0.1
0.5
%/V
V
IN
=1.55V to 3.3V
Line Regulation 2
REG.L
-
0.5
10
mV
I
O
=0 to 4A
Load Regulation
I
O
=4A,V
IN
=1.5V
Ron
-
28
50
mΩ
Output ON Resistance
Tj=-10 to 100℃
I
DEN
1
-
-
mA
V
EN
=0V, V
O
=1V
Standby Discharge Current
[ENABLE]
Enable Pin
Input Voltage High
Enable Pin
Input Voltage Low
Enable Input Bias Current
[NRCS]
NRCS Charge Current
NRCS Standby Voltage
[UVLO]
VCC Undervoltage Lockout
Threshold Voltage
VCC Undervoltage Lockout
Hysteresis Voltage
VD Undervoltage Lockout
Threshold Voltage
[SCP]
SCP Start up Voltage
SCP Threshold Voltage
Charge Current
Standby Voltage
EN
HIGH
EN
LOW
I
EN
I
NRCS
V
STB
2
-0.2
-
12
-
-
-
6
20
0
-
0.8
10
28
50
V
V
μA
μA
mV
V
EN
=3V
V
EN
=0V
V
CC
UVLO
V
CC
HYS
V
D
UVLO
3.5
100
V
O
×0.6
3.8
160
V
O
×0.7
4.1
220
V
O
×0.8
V
mV
V
V
CC
:Sweep-up
V
CC
:Sweep-down
V
D
:Sweep-up
V
OSCP
V
SCPTH
I
SCP
V
SCPSTBY
V
O
×0.3
1.05
2
-
V
O
×0.4
1.15
4
-
V
O
×0.5
1.25
6
50
V
V
μA
mV
V
FB
=0, V
GATE
=2.5V
V
FB
=VCC, V
GATE
=2.5V
5/20
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