FAN1539/FAN1540 1A/1.3A, LDO with Low Quiescent Current
November 2005
FAN1539/FAN1540
1A/1.3A, LDO with Low Quiescent Current
Features
■
Very Low Ground Current (I
GND
= 1mA)
■
Excellent Line Regulation
■
Excellent Load Regulation
■
Very Low Transient Overshoot
■
Stable with low ESR Output Capacitor (ESR = 0m
Ω
)
■
Thermal Shutdown
■
Current Limit
■
Output Options: 3.3V and 1.8V
Description
The FAN1539/FAN1540 series of high current LDOs
(1.0A and 1.3A) has been developed for portable appli-
cations where low quiescent current is an important
requirement. The device features excellent line and load
transient response which does not exceed 10% of nomi-
nal output value for full operating temperature range
even during power ON cycle and short circuit removal.
Internally trimmed, temperature compensated bandgap
reference guarantees 2.5% accuracy for full range of
input voltage, output current and temperature. Included
on the chip are accurate current limit and thermal shut-
down protection. Device stability is achieved with only
two external low ESR ceramic capacitors.
The FAN1539/FAN1540 is available in thermally
enhanced 3x3mm 6-lead MLP, 5x6mm 8-lead MLP and
3-lead TO-252 packages. The 5x6mm MLP package ver-
sion features a separate Kelvin sense pin for high preci-
sion applications.
Applications
■
Disk Drive Circuits
■
Desktop Computers
■
Laptop, Notebook Computers
■
General Purpose Three Terminal Regulator
Ordering Information
Product Number
FAN1540MMPX
FAN1539MPX
FAN1540MPX
FAN1540DX
FAN1540D18X
Output Voltage
3.3V
3.3V
3.3V
3.3V
1.8V
Package
5x6mm 8-Lead MLP in T&R
3x3mm 6-Lead MLP in T&R
3x3mm 6-Lead MLP in T&R
3-Lead TO-252 in T&R
3-Lead TO-252 in T&R
Tape and Reel Information
Quantity
3000
Reel Size
7"
Width
8mm
©2005 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
FAN1539/FAN1540 Rev. 1.1.1
FAN1539/FAN1540 1A/1.3A, LDO with Low Quiescent Current
Block Diagram
V
IN
V
OUT
BANDGAP
REFERENCE
X
CURRRENT
LIMIT
ERROR
AMPLIFIER
(Note 1)
V
SENSE
(Note 2)
START-UP
CIRCUIT
THERMAL
SHUTDOWN
GND
Notes:
1. No connection for FAN1540MMPX.
2
.
V
SEN
available for FAN1540MMPX.
Pin Assignments
TOP VIEW
GND
VOUT
VSEN
VIN
1
8
GND
GND
GND
GND
NC
VOUT
VIN
1
2
3
6
5
4
GND
NC
NC
2
7
FAN1540
3
6
4
5
FAN1540
FAN1539/FAN1540
3x3mm 6-Lead MLP
5x6mm 8-Lead MLP
VOUT
GND
VIN
3-Lead TO-252 PACKAGE
Pin Description
Symbol
V
IN
GND
V
OUT
V
SEN
NC
Input pin
Ground Pin (Tab)
Output pin: Fixed Output Voltage
Output sense pin. Connect to V
OUT
if Kelvin sensing is not required
No Connection
Name and Function
2
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FAN1539/FAN1540 Rev. 1.1.1
FAN1539/FAN1540 1A/1.3A, LDO with Low Quiescent Current
Absolute Maximum Ratings
Parameter
Operating Input Voltage
Power Dissipation
Short Circuit Output Current
Operating Junction Temperature Range
Thermal Resistance–Junction to Tab, TO-252
Thermal Resistance–Junction to Tab, 3mmx3mm 6-lead MLP (Note 3)
Thermal Resistance–Junction to Tab, 5mmx6mm 8-lead MLP (Note 3)
Storage Temperature Range (Note 3)
Lead Temperature (I.R. Reflow) 30 Sec. (Note 4)
Lead Temperature (Soldering) 10 Sec. (Note 4)
Electrostatic Discharge Protection (Note 5)
HBM
CDM
Symbol
V
IN
P
D
I
OSH
T
J
θ
JC
θ
JC
θ
JC
T
STG
T
LEAD
T
LEAD
ESD
Value
10
Internally
Limited
Internally
Limited
0 to 150
3
8
4
-65 to 150
240
260
4
2
Units
V
W
A
°
C
°
C/W
°
C/W
°
C/W
°
C
°
C
°
C
kV
Notes:
3. Junction to ambient thermal resistance,
θ
JA,
is a strong function of PCB material, board thickness, thickness and
number of copper plains, number of via used, diameter of via used, available copper surface, and attached heat sink
characteristics.Thermal resistance (
θ
JA
), V
IN
, I
OUT
must be chosen not to exceed T
J
= 150
°
C.
4. Soldering temperature should be 260
°
C for 10 second after 240
°
C for 30 second in I.R. reflow using 60/40 solder.
Maximum rate of temperature rise is 3
°
C/SEC to within 100
°
C of the final temperature.
5. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
3
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FAN1539/FAN1540 Rev. 1.1.1
FAN1539/FAN1540 1A/1.3A, LDO with Low Quiescent Current
Electrical Characteristics—FAN1539MPX, FAN1540MPX, FAN1540MMPX,
FAN1540DX
Unless otherwise specified, V
IN
= 4.50V to 7V, T
j
= 25°C, I
MAX
(FAN1539) = 1.0A, I
MAX
(FAN1540) = 1.3A.
Boldface limits
apply over operating junction temperature range of 0°C
≤
T
J
≤
125°C
.
Test Conditions
Parameter
Output Voltage
FAN1540
Line Regulation
Load Regulation
Dropout Voltage
(Note 6)
Current Limit
Min. Output
Current for
regulation
(
∆
V
OUT
≤
3%)
Temperature
Stability
RMS Output
Noise
(Note 7)
Ripple Rejection
Ratio (Note 8)
Test Limits
Min.
3.234
3.217
Symbol
V
OUT
V
IN
4.75V
≤
V
IN
≤
5.25V
I
OUT
5mA
≤
I
OUT
≤
I
MAX
5mA
≤
I
OUT
≤
I
MAX
5mA
≤
I
OUT
FAN1539
≤
I
MAX
FAN1540
I
OUT
= I
MAX
Typ.
3.300
2
25
30
0.9
3.3
Max.
3.366
3.383
15
35
40
1.2
Units
V
mV
mV
V
A
REG
(LINE)
3.0V
≤
V
IN
≤
5.25V
REG
(LOAD)
V
D
I
S
I
OMIN
5.5V
4.75V
0
mA
T
S
V
N
I
OUT
= 5mA
I
OUT
= I
MAX
0.3
0.003
%
%V
OUT
R
A
5V
I
OUT
= 10mA
I
OUT
= 100mA
I
OUT
= I
MAX
65
63
45
75
73
57
2.0
10
(under-
shoot or
overshoot
of V
OUT
)
dB
Transient
Response
Change of V
OUT
with step load
change (Note 9)
∆V
OUT
------------------
∆I
OUT
5V
1mA to I
MAX
t
r
≥
1µS
I
MAX
to 1mA
t
f
≥
1µS
%
Transient
Response
Change of V
OUT
with application
of V
IN
(Note 9)
Transient
Response
Short circuit
Removal
Response
(Note 9)
Quiescent
Current
∆V
OUT
------------------
∆V
IN
0 to 5V Step Input
t
r
≥
1µS
10% to 90%
1mA
≤
I
OUT
≤
I
MAX
5.0
10
(under-
shoot or
overshoot
of V
OUT
)
%
∆V
OUT
------------------
∆
V
IN
@I
OUT
=
short
I
GND
5V
I
OUT
= short
to
I
OUT
= 10mA
5.0
10
(over-
shoot or
under-
shoot of
V
O
)
2.0
%
V
IN
≤
7V
I
OUT
= 0mA
1.0
mA
4
www.fairchildsemi.com
FAN1539/FAN1540 Rev. 1.1.1
FAN1539/FAN1540 1A/1.3A, LDO with Low Quiescent Current
Electrical Characteristics—FAN1539MPX, FAN1540MPX, FAN1540MMPX,
FAN1540DX
(Continued)
Unless otherwise specified, V
IN
= 4.50V to 7V, T
j
= 25˚C, I
MAX
(FAN1539) = 1.0A, I
MAX
(FAN1540) = 1.3A.
Boldface limits
apply over operating junction temperature range of 0°C
≤
T
J
≤
125°C
.
Test Conditions
Parameter
Quiescent
Current
Quiescent
Current
Thermal
Shutdown
Thermal
Hysteresis
Test Limits
Min.
Typ.
1.0
1.0
160
15
Symbol
I
GND
I
GND
T
jSD
T
HYST
V
IN
V
IN
≤
7V
V
IN
= 5V
3.0V
≤
V
IN
≤
5.25V
3.0V
≤
V
IN
≤
5.25V
I
OUT
2mA
≤
I
OUT
≤
I
MAX
0mA
≤
I
OUT
≤
50mA
Max.
2.0
2.0
Units
mA
mA
°C
°C
Notes:
6. Dropout voltage is defined as the input to output differential voltage at which the output voltage drops 1% below the
nominal value measured at
V
IN
= 5V.
7. Measured within 10Hz to 10kHz bandwidth.
8. Measured at DC, specified at 120 Hz.
9. C
IN
= 22µF, C
OUT
= 10µF. Both capacitors are low ESR X7R type.
Test Circuit
V
IN
IN
C
IN
22µF
GND
V
OUT
DUT
OUT
10µF
C
OUT
Notes: 1. Use low ESR capacitors.
2. C
IN
should be placed as close to V
IN
as possible.
5
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FAN1539/FAN1540 Rev. 1.1.1
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