FAN2591MU33TLX [FAIRCHILD]
Fixed Positive LDO Regulator, 3.3V, 0.35V Dropout, CMOS, PDSO8, MSOP-8;
| 型号： | FAN2591MU33TLX |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Fixed Positive LDO Regulator, 3.3V, 0.35V Dropout, CMOS, PDSO8, MSOP-8 光电二极管 输出元件 调节器 |
| 文件： | 总10页 (文件大小：139K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
FAN2591
350mA CMOS LDO with Shutdown, Bypass and
Independent Voltage Detector with Delayed Reset Output
Features
General Description
• LDO with Integrated Microprocessor Reset Control
• Low Supply Current (70µA typ)
• Ultra-Low Dropout Voltage (0.9mV/mA)
• Guaranteed 350mA Output
• Output Voltage Range from 1.3V to 6.2V
• Bypass Input Capacitor for Low Noise Operation
• Active LOW or Active HIGH or Open Drain RESET
output
• 150msec Guaranteed Minimum RESET Output with
NO external components
The FAN2591 family of Low supply current and high-
precision LDOs feature very low dropout voltage, delayed
microprocessor reset circuitry without external components,
and continuous 350mA load current capability. An External
Bypass Capacitor can be added to reduce the output noise of
the Fixed Output version. Voltage detector input, VDET, and
power supply input VIN can be connected together. In this
case, the RST output can be used for low battery detection,
otherwise the VDET input can be used independently from
VIN, in order to detect any voltage threshold within the
• Factory Programmable VTH for Voltage Detector from
1.5V to 4.8V
factory programmable range (1.5V to 4.8V).
• MSOP-8 and 3x3 MLP-8 Package
The FAN2591 incorporates both over-temperature and
over-current protection. Output is stable with 22µF or more,
tantalum capacitor.
Applications
• Battery-Operated Systems
• Portable Computers
The FAN2591 is available in space saving MSOP-8 and 3x3
MLP-8 packages.
• Computers & Printers, Controllers
• Critical Microprocessor Power Monitoring
• Intelligent Instruments
• Pagers
Block Diagram
OUT
IN
EN
ENABLE
CURRENT LIMIT
AND THERMAL
PROTECTION
V
REF
RESET
GENERATOR
V
DET
V
TH
RST
SELECT
REV. 1.0.4 12/12/02
FAN2591
Pin Configuration,Top View
1
2
3
4
8
7
6
5
RST
VOUT
GND
VDET
VIN
NC
RST
VOUT
GND
1
2
3
4
8
7
6
5
VDET
VIN
NC
FAN2591
Fixed
FAN2591
Fixed
CNoise
EN
CNoise
EN
MSOP-8
8 Lead MLP 3x3
1
8
7
6
5
RST
VOUT
FB
VDET
VIN
NC
RST
VOUT
FB
1
2
3
4
8
7
6
5
VDET
VIN
NC
2
3
4
FAN2591
Adj
FAN2591
Adj
GND
EN
GND
EN
MSOP-8
8 Lead MLP 3x3
Pin Definitions
Pin Name
RST
Pin Function Description
Reset Output. Active “H” or Active “L” or “Open Drain”
Regulated Voltage Output.
VOUT
GND
Ground Connection.
CNoise
EN
Reference Voltage Bypass Input.
Chip Enable Input. The regulator is fully enabled when a logic “H” is applied to this input.The
regulator enters into shutdown mode when logic “L” is applied to this input.
During shutdown, the regulator output falls to zero, RST output goes HIGH and the supply current is
reduced below 10µA, if there is no voltage applied to VDET.
NC
VIN
Not Connected.
Power Supply Input.
VDET
Voltage Detector Input. VDET and VIN can be connected together to detect low power supply
voltage.
FB
Input to set the adjustable output voltage. Do not connect a capacitor to this pin.
Pin Assignments
Pin
FAN2591
FAN2591
Number
Fixed Output Voltage
Adjustable Output Voltage
1
2
3
4
5
6
7
8
RST
VOUT
GND
CNoise
EN
RST
VOUT
FB
GND
EN
NC
NC
VIN
VIN
VDET
VDET
2
REV. 1.0.4 12/12/02
FAN2591
Absolute Maximum Ratings
Absolute maximum ratings are the values beyond which the device may be damaged or have its useful life impaired.
Functional operation under these conditions is not implied.
Parameter
Min.
Max.
7
Units
V
Supply Voltage, VIN to GND
Voltage on any Other Pin
-0.3
–55
–65
VIN + 0.3
150
V
Junction Temperature (TJ)
°C
°C
°C
kV
Storage Temperature
150
Lead Soldering Temperature, 5 seconds
Electrostatic Discharge Protection (Human Body Model)
260
4
Recommended Operating Conditions
Parameter
Conditions
Min
Typ
VOUT + 1
Max
6.5
Units
Supply Voltage, VIN
Load Current
VOUT + VDO
V
TJ < 150°C
350
+85
mA
°C
Ambient Operating Temperature
–40
8
1
VDET
RST
RST
VDET
(Optional)
7
6
5
2
3
4
V
IN
V
OUT
C2
10µF
V
OUT
C1
+
+
-
FAN2591
22µF Tantalum
Battery
GND
NC
EN
C
BYPASS
ON OFF
CBYPASS
470pF
(Optional)
Figure 1. Test Circuit for Fixed Output Version
8
1
VDET
RST
(Optional)
RST
VDET
7
6
5
2
3
4
V
IN
V
OUT
C2
10µF
V
OUT
+
+
-
R1
R2
FAN2591
Battery
C1
22µF Tantalum
FB
NC
EN
ON OFF
GND
Figure 2. Test Circuit for ADJ Output Version
REV. 1.0.4 12/12/02
3
FAN2591
Electrical Specifications
(V = V
+ 1V, I
= 0.1mA, V = V , and T = +25°C, using circuit in Figure 1 or Figure 2, unless otherwise specified)
IN
OUT
OUT
IN
EN
A
Symbol
VOUT
Parameter
Conditions
Min
Typ
Max
Unit
V
Output Voltage (Note 1) -40°C ≤ TA ≤ 85°C
0.97VNOM
VNOM
1.03VNOM
VTH
Threshold Voltage
(Note 1)
RST Changes Logic
Status
0.95VTH
NOM
VTH
NOM
1.05VTH
NOM
V
∆VOUT
∆VIN x VOUT
∆VOUT
VOUT
Line Regulation
VIN = (VOUT + 1) to
VIN = 6.5V
0.1
0.1
0.4
% / V
%
Load Regulation
IOUT = 1 to 350mA
0.3
VDO
Dropout Voltage (Note 2) IOUT = 350mA
Feedback Voltage (ADJ) IFB < 10 nA
300
1.235
70
350
1.26
80
mV
V
VFB
1.19
IGND
Ground Current
IOUT = 0
µA
IOUT = 350mA
VEN = 0
70
80
µA
ISD
ISC
Shut-Down Current
10
14
µA
Output Short Circuit
Current
VOUT = 0
1.2
Apeak
Enable Input
VEL
VEH
IEH
Logic Low Voltage
Logic High Voltage
Input Current High
Input Current Low
0.7
1.7
V
V
VEN = VIN
VEN = 0
10
µA
µA
IEL
0.01
Voltage Detector Input
IVDH Input Current High
IVDL
VDET = 5.5V
VDET = 1.5V
1.9
0.5
3
1
µA
µA
Input Current Low
RST Output
IOH
Current sourced HIGH
Active Low or High
VRST = VIN – 1.5V
RST = High
3
4.5
6
2
mA
µA
ILEAK
IOL
Leakage Current Open
Drain
VRST = 6.5V
VDET > VTH
Current sinked LOW
VRST = 0.5V
3
3.5
5
mA
mS
RST = Low
tR
Reset Timeout Period
VDET < VTH
150
200
250
Notes:
1. VNOM and VTHNOM are the nominal Output and Threshold Voltages, selected by the customer, respectively. For specific fixed
voltages please refer to the table Ordering Information, on the last page of this data sheet. Custom fixed voltages, not listed
in the table, are also available on request.
2. Dropout voltage is defined as the input to output differential at which the output voltage drops to 1% below the value measured
at 1V input – output differential.
4
REV. 1.0.4 12/12/02
FAN2591
Typical Characteristics
Unless otherwise specified TA = 25°C, VIN = VOUTnom + 1V, VIN = VEN, Iload = 0.1mA, using Test Circuit Figure 1
Ground Current vs. Load Current
Load Transient Response
66
+85C
64
62
60
58
56
54
52
50
+25C
-40C
0
50 100 150 200 250 300 350 400
Load Current (mA)
ON/OFF Transient Response
Termal Cycling under Short Circuit Condition
Spectral Noise Density and Noise Voltage
Ripple Rejection vs. Frequency
REV. 1.0.4 12/12/02
5
FAN2591
V
to RST Delay
DET
RST Timeout Period
VDET
VDET
RST
RST
Threshold Voltage vs. Temperature
Output Voltage vs. Temperature
+0.6
+0.3
+0.8
+0.4
0
-0.4
-0.8
-1.2
0
-0.3
-0.6
-50 -30 -10
10
30
50 70
90
-40
-20
0
20
40
60
80
Ambient Temperature (°C)
Ambient Temperature (°C)
Dropout Voltage vs. Load Current
0.45
-40C
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
+85C
25C
100
150
200
250
300
350
Load Current (mA)
6
REV. 1.0.4 12/12/02
FAN2591
Application Information
Detailed Description
Thermal Shutdown
The FAN2591 is a combination of a fixed voltage output,
low dropout CMOS voltage regulator and a voltage detector
with factory programmable VTH, for low battery indication
or microprocessor reset control. Features low supply current,
which does not increase with the load current, remains at the
low level with the highest load, providing continuous 350mA
load current. VOUT remains stable and within regulation also
in very low load current, at the level of 100µA, which is
crucial in RTC and CMOS RAM battery back-up
application.
Integrated thermal protection circuitry shuts the regulator off
when die temperature exceeds 150°C. The regulator remains
off until the die temperature drops to approximately 130°C.
Voltage Detector
The Threshold Voltage VTH for Voltage Detector is preset by
the factory within the range 1.5V to 4.8V, for any specific
user request. RST output available for user request can be in
Active HIGH or Active LOW, or Open Drain version. The
RST output is guaranteed to remain asserted for a minimum
of 150ms after VDET has risen above the designated preset
threshold. Also, VIN and VDET can be connected together.
Output and Input Capacitors
A 22µF (min.) Tantalum capacitor with ESR in the range
0.8Ω to 5Ω from VOUT to ground is required. 10µF is
acceptable for ambient temperatures above 0°C. Capaci-
tances less than 10µF are not recommended because they
require careful selection of ESR to ensure stability. A min
10µF capacitor should also be connected from VIN to GND.
Microprocessor Reset
The RST pin is asserted whenever VDET falls below the
preset threshold voltage. The reset pin remains asserted for a
typical time period of 200ms after VIN has risen above the
preset threshold voltage (fig. 2). The reset function ensures
the microprocessor is properly reset and powers up into a
known condition after a power failure. RST will remain valid
with VDET as low as 1.4V.
When operating from sources other than batteries, supply
noise rejection and transient response can be improved by
increasing the value of the input and output capacitors and
utilizing passive filtering techniques.
VDET Transients
Bypass Input Capacitor
The FAN2591 are relatively immune to negative-going VDET
glitches below the preset threshold. Typically, a negative-
going transient 125mV below the detection threshold with a
duration of 35µs or less will not cause an unwanted reset.
(optional, fixed output voltage only)
A 470pF or more capacitor connected from the Cnoise input
to ground reduces noise present on the internal reference,
which in turn significantly reduces output noise. This input
may be left unconnected. Larger capacitor values may be
used, depending on the sensitivity to output noise in the
application, but this will result in a longer time period to
reach the steady state.
VDET
VTH
Adjustable Output Voltage
tR
tR
The FAN2591ADJ version includes an FB input which
allows the user to select an output voltage in the range of
1.3V to 6.2V, determined by R1 and R2 (Figure 2) according
to the relation:
RST Active “L”
Active “H”
R1
VOUT = VFB 1 + -----
R2
For best results we recommend:
Figure 3. Timing Diagram
R1 • R2
R1 + R2
------------------
≤ 250kΩ
REV. 1.0.4 12/12/02
7
FAN2591
Package Dimensions
8-Pin MSOP
0.118 - 0.004
[3 0.1]
–A–
SYMM
C
8
5
(0.189)
[4.8]
0.118 0.004
[3 0.1]
0.193 0.004
[4.9 0.1]
–B–
(0.040)
[1.02]
TYP
PIN 1
IDENT
(0.016)
[0.41]
TYP
(0.0256)
[0.65]
TYP
1
4
LAND PATTERN RECOMMENDATION
TYP
(0.0256)
[0.65]
TYP
0.005
[0.13]
R
GAGE
PLANE
0.030 - 0.037
[0.78 - 0.94]
0.005
TYP
R
[0.13]
(0.010)
[0.23]
–C–
0.002 [0.05]
C
0.021 0.005
[0.53 0.12]
0.012 0.002
[0.3 0.05]
(0.033)
[0.84]
TYP
0°–6° TYP
SEATING PLANE
0.002 - 0.006
TYP
0.0375
[0.953]
[0.06 - 0.15]
0.002 [0.05] M
A
S
B S
0.007 0.002
[0.18 0.05]
TYP
8
REV. 1.0.4 12/12/02
FAN2591
8-Pin MLP 3x3
3.0
A
2.37
0.15 C
4
1
B
2X
1.42
(0.65)
0.65 TYP
RECOMMENDED LAND PATTERN
1.99
3.30
3.0
5
8
0.47 TYP
0.15 C
TOP VIEW
2X
1.0 MAX
0.10 C
(0.20)
C
0.08
C
0.05
0.00
SIDE VIEW
SEATING
PLANE
2.25
MAX
1
4
0.45
0.20
1.30
MAX
5
8
0.25~0.35
Ø0.10
0.65
M
M
C A B
C
1.95
BOTTOM VIEW
Ø0.05
NOTES:
A. CONFORMS TO JEDEC REGISTRATION MO-229,
VARIATION VCCD–3, DATED 11/2001
B. DIMENSIONS ARE IN MILLIMETERS.
C. DIMENSIONS AND TOLERANCES PER
ASME Y14.5M, 1994
REV. 1.0.4 12/12/02
9
FAN2591
Ordering Information for (-40°C to +85°C) Temperature Range
Nominal
Output
Voltage (V)
Nominal
Threshold
Voltage (V)
RST
Configuration
Package
Part Number
Package
MSOP-8
MSOP-8
MLP3x3-8
MLP3x3-8
MSOP-8
MLP3x3-8
Marking
591CTL
591ERL
591CTL
591ERL
591RRL
591RRL
FAN2591MU33TLX
FAN2591MU30RLX
FAN2591MP33TLX
FAN2591MP30RLX
FAN2591MUADJROX
FAN2591MPADJROX
3.3
3
3.08
2.63
3.08
2.63
2.63
2.63
Active LOW
Active LOW
3.3
3
Active LOW
Active LOW
Adj
Adj
Open Drain Active LOW
Open Drain Active LOW
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO
ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME
ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;
NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and (c) whose failure to perform
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in a significant injury of the user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
12/12/02 0.0m 004
Stock#DS30002591
2002 Fairchild Semiconductor Corporation
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