FAN5331SX [ONSEMI]
可调，1.6MHz 升压稳压器，带 20V 集成 FET 开关;
| 型号： | FAN5331SX |
| 厂家： | 
ONSEMI |
| 描述： | 可调，1.6MHz 升压稳压器，带 20V 集成 FET 开关 开关 PC 光电二极管 稳压器 |
| 文件： | 总11页 (文件大小：275K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATA SHEET
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High Efficiency Serial LED
Driver and OLED Supply
with 20ꢀV Integrated Switch
SOT−23 (5−LEAD)
CASE 527 AH
FAN5331
MARKING DIAGRAM
Description
The FAN5331 is a general purpose, fixed−frequency boost
converter designed to operate at high switching frequencies in order to
minimize switching noise measured at the battery terminal of
hand−held communications equipment. Quiescent current in normal
mode of operation as well as in shutdown mode is designed to be
minimal in order to extend battery life. Normal mode of operation or
shutdown mode can be selected by a logic level shutdown circuitry.
The low ON−resistance of the internal N−channel switch ensures
high efficiency and low power dissipation. A cycle−by−cycle current
limit circuit keeps the peak current of the switch below a typical value
of 1 A. The FAN5331 is available in a 5−lead SOT− 23 package.
XXXM
XXX = Specific Device Code
M
= Date Code
*This information is generic. Please refer to
device data sheet for actual part marking.
Pb−Free indicator, “G” or microdot “G”, may
or may not be present. Some products may
not follow the Generic Marking.
Features
• 1.6 MHz Switching Frequency
• Low Noise
PIN ASSIGNMENT
• Low R
: 0.5 W
DS(ON)
• Adjustable Output Voltage
• 1 A Peak Switch Current
• 1 W Output Power Capability
• Low Shutdown Current: <1 μA
• Cycle−by−Cycle Current Limit
• Over−Voltage Protection
• Fixed−Frequency PWM Operation
• Internal Compensation
• 5−lead SOT−23 Package
5
V
IN
1
SW
GND
2
3
SHDN
FB
4
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
Typical Application
• Cell Phones
• PDAs
• Handheld Equipment
• Display Bias
• LED Bias
© Semiconductor Components Industries, LLC, 2004
1
Publication Order Number:
September, 2021 − Rev. 2
FAN5331/D
FAN5331
BAT54
L
VOUT
2.7 V to 5.5 V
VIN
CIN
10 mH
COUT
4.7 mF
4.7 mF
CF
R1
5
1
3
SW
FB
VIN
120 pF
R2
2
4
ON
GND
SHDN
OFF
Figure 1. Typical Application Diagram
PIN DESCRIPTION
Pin No.
Pin Name
SW
Pin Description
1
2
3
Switching node.
GND
Analog and power ground.
FB
Feedback node that connects to an external voltage divider.
SHDN
4
5
Shutdown control pin. Logic HIGH enables, logic LOW disables the device.
Input voltage.
VIN
ABSOLUTE MAXIMUM RATINGS
Parameter
Min
−
Max
6.0
+ 0.3
Unit
V
V
to GND
IN
FB, SHDN to GND
−0.3
−0.3
−
V
IN
V
SW to GND
23
300
150
150
265
−
V
Lead Soldering Temperature (10 seconds)
Junction Temperature
Storage Temperature
°C
−
°C
−55
−
°C
Thermal Resistance (Θ
)
°C/W
kV
JA
Electrostatic Discharge Protection (ESD) Level (Note 1)
HBM
CDM
2.5
1
−
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
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2
FAN5331
RECOMMENDED OPERATING CONDITIONS
Parameter
Min
2.7
Typ
−
Max
5.5
20
Unit
V
Input Voltage
Output Voltage
VIN
−40
1.6
−
V
Operating Ambient Temperature
Output Capacitance (Note 2)
25
−
85
°C
mF
−
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
1. Using EIA/JESD22A114B (Human Body Model) and EIA/JESD22C101−A (Charge Device Model).
2. This load capacitance value is required for the loop stability. Tolerance, temperature variation, and voltage dependency of the capacitance
must be considered. Typically a 4.7 mF ceramic capacitor is required to achieve specified value at V
= 15 V.
OUT
ELECTRICAL CHARACTERISTICS Unless otherwise noted, V = 3.6 V, T = −40°C to +85°C, Typical values are at T = 25°C,
IN
A
A
Test Circuit, Figure 2.
Parameter
Switch Current Limit
Conditions
Min
0.7
35
50
−
Typ
1
Max
Units
V
V
V
V
V
V
V
V
= 3.2 V
−
−
A
mA
mA
W
IN
Load Current Capability
−
= 15 V, V ≥ 2.7 V
OUT
OUT
IN
= 15 V, V ≥ 3.2 V
−
−
IN
Switch On−resistance
= 5 V
0.5
0.7
0.7
1.6
0.1
−
−
IN
= 3.6 V
−
−
W
IN
Quiescent Current
= 3.6 V, No Switching
= 3.6 V, Switching
= 0 V
−
−
mA
mA
mA
V
SHDN
SHDN
SHDN
−
3.0
2
OFF Mode Current
Shutdown Threshold
−
Device ON
1.5
−
−
Device OFF
−
0.5
−
V
Shutdown Pin Bias Current
Feedback Voltage
V
SHDN
= 0 V or V
= 5.5 V
−
10
1.230
10
0.6
1.6
93
0.8
0.8
−
nA
V
SHDN
I
= 0 mA
1.205
−
1.255
−
Load
Feedback Pin Bias Current
Feedback Voltage Line Regulation
Switching Frequency
Maximum Duty Cycle
Enable Delay
nA
%
2.7 V < V < 5.5 V, I
= 0 mA
−
1.2
1.85
−
IN
LOAD
1.15
87
−
MHz
%
V
V
= 2.7 V, I
= 2.7 V, I
= 35 mA, V
= 35 mA, V
= 15 V
= 15 V
5
mS
mS
mA
IN
OUT
OUT
Power on Delay
−
5
IN
OUT
OUT
Switch Leakage Current
No Switching, V = 5.5 V
−
1
IN
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
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3
FAN5331
BAT54
VOUT
L
VIN
CIN
2.7 V to 5.5 V
COUT
10 mH
4.7 mF
4.7 mF
CF
150 KW
R1
5
1
3
SW
FB
VIN
120 pF
R2
13.4 KW
2
4
ON
GND
SHDN
OFF
Figure 2. Test Circuit
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4
FAN5331
TYPICAL CHARACTERISTICS
T = 25°C, Test Circuit Figure 2, unless otherwise noted.
A
14.98
14.96
14.94
210
180
V
= 12 V
= 15 V
OUT
150
120
90
V
OUT
14.92
14.90
VIN(V) vs VOUT(V) at Iload = 0 mA
VIN(V) vs VOUT(V), at load = 10 mA
VIN(V) vs VOUT(V), at load = 20 mA
VIN(V) vs VOUT(V) at Iload = 30 mA
VIN(V) vs VOUT(V) at Iload = 40 mA
VIN(V) vs VOUT(V) at Iload = 50 mA
60
V
OUT
= 21 V
4.5
14.88
14.86
30
0
2.5
3.0
3.5
4.0
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Input Voltage (V)
Figure 4. Maximum Load Current vs Input
Voltage
Figure 3. Output Voltage vs Input Voltage
0.92
0.90
0.88
0.86
0.84
0.82
0.80
0.78
0.76
0.74
0.72
I
= 15 mA
OUT
1.25
1.24
1.23
1.22
1.21
VIN(V) vs Efficiency at Iload = 10 mA
VIN(V) vs Efficiency at Iload = 20 mA
VIN(V) vs Efficiency at Iload = 30 mA
VIN(V) vs Efficiency at Iload = 40 mA
VIN(V) vs Efficiency at Iload = 50 mA
Temperature (°C) vs Vf (Vin = 2.7 V, Iload = 15 m A)
Temperature (°C) vs Vf (Vin = 3.6 V, Iload = 15 m A)
Temperature (°C) vs Vf (Vin = 5.5 V, Iload = 15 m A)
50
100
1505
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
−50
0
Input Voltage (V)
Ambient Temperature (°C)
Figure 5. Efficiency vs Input Voltage
Figure 6. Feedback Voltage vs Ambient
Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0.0
I
= 0 mA
I
V
V
= 15 mA
OUT
OUT
1.8
1.6
1.4
1.2
1.0
= 15 V
OUT
= 3.6 V
IN
Switching
Non Switching
−40
−20
0
20
40
60
80
100 120 140
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Ambient Temperature (°C)
Figure 7. Supply Current vs Input Voltage
Figure 8. Switching Frequency vs Ambient
Temperature
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5
FAN5331
TYPICAL CHARACTERISTICS (continued)
T = 25°C, Test Circuit Figure 3, unless otherwise noted.
A
I
= 300 mA
OUT
R = 300 W
L
T = T = 10 mS
V
r
f
V
V
= 3 V
= 15 V
V
IN
= 4.2 V
IN
OUT
= 15 V
OUT
V
IN
= 3.2 V
+0.6 V
−0.6 V
Inductor Current = 0 mA
Time (200 ms/div)
Time (100 ms/div)
Figure 9. Startup After Enable
Figure 10. Line Transient Response
V
IN
= 3.5 V
I
= 35 mA
OUT
T = T < 1 mS
r
f
V
OUT
= 15 V
I
= 0 to 35 mA
OUT
Time (200 ms/div)
Figure 12. Output Power Spectral Density
Figure 11. Load Transient Response
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6
FAN5331
V
IN
SHDN
4
SW
1
5
Shutdown
Circuitry
FB
+
Over
Voltage
Comp
−
1.15 x V
REF
Thermal
Shutdown
R
R
−
3
FB
Error
Amp
+
+
n
Q
Driver
Comp
−
S
R
S
Current Limit
Comparator
Remap
Generator
−
+
Oscillator
+
Amp
0.05
−
Reference
Soft−Start
2
GND
Figure 13. Block Diagram
CIRCUIT DESCRIPTION
Every time the latch is reset, the FET is turned off and the
current flow through the switch is terminated. The latch can
be reset by other events as well. Over−current condition is
monitored by the current limit comparator which resets the
latch and turns off the switch instantaneously within each
clock cycle.
The FAN5331 is a pulse−width modulated (PWM)
current−mode boost converter. The FAN5331 improves the
performance of battery powered equipment by significantly
minimizing the spectral distribution of noise at the input
caused by the switching action of the regulator. In order to
facilitate effective noise filtering, the switching frequency
was chosen to be high, 1.6 MHz. An internal soft start
circuitry minimizes in−rush currents. The timing of the soft
start circuit was chosen to reach 95% of the nominal output
voltage within maximum 5 mS following an enable
Over−Voltage Protection
The voltage on the feedback pin is sensed by an OVP
Comparator. When the feedback voltage is 15% higher than
the nominal voltage, the OVP Comparator stops switching
of the power transistor, thus preventing the output voltage
from going higher.
command when V = 2.7 V, V
= 15 V, I
= 35 mA
IN
OUT
LOAD
and C
= 3.2 mF.
OUT (EFFECTIVE)
The device architecture is that of a current mode controller
with an internal sense resistor connected in series with the
N−channel switch. The voltage at the feedback pin tracks the
output voltage at the cathode of the external Schottky diode
(shown in the test circuit). The error amplifier amplifies the
difference between the feedback voltage and the internal
bandgap reference. The amplified error voltage serves as
a reference voltage to the PWM comparator. The inverting
input of the PWM comparator consists of the sum of two
components: the amplified control signal received from the
50 mW current sense resistor and the ramp generator voltage
derived from the oscillator. The oscillator sets the latch, and
the latch turns on the FET switch. Under normal operating
conditions, the PWM comparator resets the latch and turns
off the FET, thus terminating the pulse. Since the comparator
input contains information about the output voltage and the
control loop is arranged to form a negative feedback loop,
the value of the peak inductor current will be adjusted to
maintain regulation.
APPLICATIONS INFORMATION
Setting the Output Voltage
The internal reference is 1.23 V (Typical). The output
voltage is divided by a resistor divider, R1 and R2 to the FB
pin. The output voltage is given by
R1
R2
ǒ1 ) Ǔ
V
OUT + VREF
According to this equation, and assuming desired output
voltage of 15 V, good choices for the feedback resistors are,
R = 150 kW and R = 13.4 kW.
1
2
Inductor Selection
The inductor parameters directly related to device
performances are saturation current and dc resistance. The
FAN5331 operates with a typical inductor value of 10 mH.
The lower the dc resistance, the higher the efficiency.
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7
FAN5331
Usually a trade−off between inductor size, cost and overall
Care should be taken to avoid any short circuit of V
OUT
efficiency is needed to make the optimum choice.
The inductor saturation current should be rated around
1 A, which is the threshold of the internal current limit
circuit. This limit is reached only during the start−up and
with heavy load condition; when this event occurs the
converter can shift over in discontinuous conduction mode
due to the automatic turn−off of the switching transistor,
resulting in higher ripple and reduced efficiency.
Some recommended inductors are suggested in the table
below:
to GND, even with the IC disabled, since the diode can be
instantly damaged by the excessive current.
Thermal Shutdown
When the die temperature exceeds 150°C, a reset occurs
and will remain in effect until the die cools to 130°C, at that
time the circuit will be allowed to restart.
PCB Layout Recommendations
The inherently high peak currents and switching
frequency of power supplies require careful PCB layout
design. Therefore, use wide traces for high current paths and
place the input capacitor, the inductor, and the output
capacitor as close as possible to the integrated circuit
terminals. The resistor divider that sets the output voltage
should be routed away from the inductor to avoid RF
coupling. A four layer PCB with at least one ground plane
connected to the pin 2 of the IC is recommended. This
ground plane acts as an electromagnetic shield to reduce
EMI and parasitic coupling between components.
Table 1. RECOMMENDED INDUCTORS
Inductor
Value
Vendor
Part Number
Comment
10 µH
Panasonic
ELL6GM100M
Lower Profile
(1.6 mm)
10 µH
10 µH
Murata
LQS66SN100M03L Highest Efficiency
DO1605T−103Mx Small Size
Coilcraft
Capacitors Selection
For best performance, low ESR input and output
capacitors are required. Ceramic capacitors in the range
4.7 mF to 10 mF, placed as close to the IC pins, are
recommended for the lower input and output ripple. The
output capacitor voltage rating should be according to the
V
OUT
setting.
A feed forward capacitor C , is required for stability. The
F
recommended value (R x C ) is around 18 mS. Some
1
F
capacitors are suggested in the table below.
Table 2. RECOMMENDED CAPACITORS
Capacitor
Figure 14. Recommended Layout
APPLICATION EXAMPLES
Value
4.7 µF
4.7 µF
Vendor
Panasonic
Murata
Part Number
ECJ3YB1C475K
GRM31CR61C475
LED Driver
Diode Selection
One or more serial LED strings can be driven with
a constant current, set by the series resistor, given by
The external diode used for rectification is usually
a Schottky diode. Its average forward current and reverse
voltage maximum ratings should exceed the load current
and the voltage at the output of the converter respectively.
A barrier Schottky diode such as BAT54 is preferred, due to
its lower reverse current over the temperature range.
1.23V
ILED
+
R1
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8
FAN5331
BAT54
VOUT
Dual Boost Converter
A negative voltage can be provided by adding an external
charge pump (C1, C2, D2, and D3).
2.7V to 5.5V
L
VIN
10μH
COUT
CIN
4.7μF
4.7μF
5
1
3
SW
FB
V
IN
BAT54S
C1
D2
−V
OUT
C2
I
OUT = 10mA
0.1∝F
D3
4.7∝F
BAT54
VOUT
L
2.7V to 5.5V
R1
VIN
R2
2
ON
4
SHDN
GND
10∝H
COUT
CIN
4.7∝F
IOUT = 50mA
OFF
D1
4.7∝F
CF
R1
5
1
3
SW
FB
VIN
120pF
Figure 15. Low Noise Boost LED Driver
R2
2
4
ON
SHDN
GND
OFF
20.2
Figure 17. Dual (±) Boost Converter
20.1
20.0
19.9
19.8
19.7
While the feedback loop tightly regulates V
, the
OUT
negative out− put voltage (−V ) can supply a light load
OUT
with a negative voltage. Nevertheless, the negative voltage
depends on the changes of the load current in both −V
OUT
and +V
, as shown in the graph below.
OUT
−15 V / Unloaded
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
−18
−16
−14
−12
Figure 16. LED Current vs Input Voltage (String
Connected to FB Pin)
−15 V / 10 mA Load
The feedback loop tightly regulates the current in the
branch connected to FB pin, while the current in the other
branch depends on the sum of the LED's forward voltages,
V
and the ballast resistor. The input and the output ripple
OUT
is less than 3 m V
A Zener diode (V = 22 V) connected between V
, for load currents up to 40 mA.
RMS
−10
and
Z
OUT
0
10
20
30
40
50
GND can prevent the FAN5331 from being damaged by
over−voltage, if the load is accidently disconnected during
operation.
Load Current On Positive Output Side (mA)
Figure 18. Negative Output Voltage vs Load
Current
ORDERING INFORMATION
Device
†
Package
Shipping (Qty / Packing)
FAN5331SX
SOT−23, 5 Lead
(Pb−Free/Halogen Free)
3000 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
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9
MECHANICAL CASE OUTLINE
PACKAGE DIMENSIONS
SOT−23, 5 Lead
CASE 527AH
ISSUE A
DATE 09 JUN 2021
q
q
q
q
q
q1
q2
GENERIC
MARKING DIAGRAM*
XXXM
XXX = Specific Device Code
M
= Date Code
*This information is generic. Please refer to
device data sheet for actual part marking.
Pb−Free indicator, “G” or microdot “G”, may
or may not be present. Some products may
not follow the Generic Marking.
Electronic versions are uncontrolled except when accessed directly from the Document Repository.
Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red.
DOCUMENT NUMBER:
DESCRIPTION:
98AON34320E
SOT−23, 5 LEAD
PAGE 1 OF 1
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