FAN5333BSX [ONSEMI]
可调，1.6MHz 升压稳压器，带 30V 集成 FET 开关;
| 型号： | FAN5333BSX |
| 厂家： | 
ONSEMI |
| 描述： | 可调，1.6MHz 升压稳压器，带 30V 集成 FET 开关 开关 稳压器 |
| 文件： | 总10页 (文件大小：245K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATA SHEET
www.onsemi.com
High Efficiency, High
Current Serial LED Driver
with 30 V Integrated Switch
SOT−23, LEAD−5
CASE 527AH
FAN5333A, FAN5333B
Description
MARKING DIAGRAM
The FAN5333A/FAN5333B is a general purpose LED driver that
features fixed frequency mode operation and an integrated FET
switch. The device’s high output power makes it suitable to drive flash
LEDs in serial connections. This device is 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 both normal and shutdown mode is designed to be
minimal in order to extend battery life. Normal or shutdown mode can
be selected by a logic level shutdown circuitry.
33BM
33B
= Specific Device Code
= Date Code
M
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 1.5 A. The FAN5333A/FAN5333B is available in a 5−lead SOT23
package.
ORDERING INFORMATION
†
Device
Package
Shipping
SOT−23−5
(Pb-Free/
Halide Free)
3000 /
Tape & Reel
FAN5333ASX
FAN5333BSX
Features
SOT−23−5
(Pb-Free/
3000 /
Tape & Reel
w 1.5 MHz Switching Frequency
w Low Noise
Halide Free)
w Adjustable Output Voltage
w Up to 1.5 A Peak Switch Current
w 1.5 W Output Power Capability
w Low Shutdown Current: <1 ꢀ A
w Cycle−by−Cycle Current Limit
w Low Feedback Voltage
†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.
w Over−Voltage Protection
w Fixed−Frequency PWM Operation
w Internal Compensation
w FAN5333A has 110 mV Feedback Voltage
w FAN5333B has 315 mV Feedback Voltage
w Thermal Shutdown
w 5−Lead SOT23 Package
• These Devices are Pb−Free and Halide Free
Applications
w Cell Phones
w PDAs
w Handheld Equipment
w Display Bias
w LED Bias
w Flash LED
1
Publication Order Number:
© Semiconductor Components Industries, LLC, 2005
FAN5333B/D
February, 2022 − Rev. 2
FAN5333A, FAN5333B
TYPICAL APPLICATION
BAT54
L
V
OUT
V
IN
6.8 ꢀ H to 10 ꢀ H
C
C
I
IN
4.7 ꢀ F
to
10 ꢀ F
OUT
0.1 ꢀ F
to
2.2 ꢀ F
5
4
1
3
SW
I
V
IN
I
LED1
LED2
LED
FB
R
R1
R2
2
ON
GND
SHDN
OFF
Figure 1. Typical Application Diagram
PIN ASSIGNMENT & DESCRIPTION
1
5
4
SW
V
IN
GND
2
3
SHDN
FB
SOT−23 LEAD−5
Figure 2. Pin Assignment
Table 1. PIN DESCRIPTION
Pin
1
Name
SW
Description
Switching Node
2
GND
FB
Analog and Power Ground
3
Feedback Pin. Feedback node that connects to an external current set resistor
Shutdown Control Pin. Logic HIGH enables, logic LOW disables the device
Input Voltage Pin
4
SHDN
5
V
IN
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2
FAN5333A, FAN5333B
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
Min
Max
Unit
V
V
IN
to GND
6.0
FB, SHDN to GND
−0.3
−0.3
V
IN
+ 0.3
V
SW to GND
35
V
Lead Soldering Temperature (10 seconds)
Junction Temperature
Storage Temperature
300
150
150
210
°C
°C
°C
°C/W
kV
−55
Thermal Resistance (ꢁ
)
JA
Electrostatic Discharge Protection (ESD) Level (Note 1)
HBM
CDM
2
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.
1. Using EIA/JESD22A114B (Human Body Model) and EIA/JESD22C101−A (Charge Device Model).
Table 3. RECOMMENDED OPERATING CONDITIONS
Parameter
Min
Type
Max
5.5
30
Unit
V
Input Voltage
1.8
Output Voltage
V
IN
V
Operating Ambient Temperature
−40
25
85
°C
ꢀ F
Output Capacitance Rated at the Required Output (Note 2) for Maximum Load Current
0.47
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.
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 1 ꢀ F ceramic capacitor is required to achieve specified value at V
= 30 V.
OUT
Table 4. ELECTRICAL CHARACTERISTICS
Unless otherwise noted, V = 3.6 V, V
= 20 V, I
= 20 mA, T = −40°C to 85°C, Typical values are at T = 25°C, Test Circuit,
IN
OUT
LED
A
A
Figure 3.
Parameter
Conditions
Min
Type
Max
Unit
Feedback Voltage
FAN5333A
FAN5333B
99
299
110
315
121
331
mV
Switch Current Limit
Load Current Capability
Switch On−resistance
V
V
= 3.2 V
1.1
65
1.5
A
mA
ꢂ
IN
≤ 20 V, V = 3.2 V
OUT
IN
V
IN
V
IN
= 5 V
= 3.6 V
0.6
0.7
Quiescent Current
OFF Mode Current
Shutdown Threshold
V
V
= 3.6 V, No Switching
= 0 V
0.6
0.1
mA
ꢀ A
V
SHDN
SHDN
3
Device ON
Device OFF
1.5
0.5
300
300
Shutdown Pin Bias Current
Feedback Pin Bias Current
Feedback Voltage Line Regulation
Switching Frequency
V
SHDN
= 0 V or V
= 5.5 V
1
nA
nA
%
SHDN
1
2.7 V < V < 5.5 V, V
≤ 20 V
0.3
1.5
93
IN
OUT
1.2
87
1.8
1
MHz
%
Maximum Duty Cycle
Switch Leakage Current
OVP
No Switching, V = 5.5 V
ꢀ A
%
IN
15
Thermal Shutdown Temperature
150
°C
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
FAN5333A, FAN5333B
TEST CIRCUIT
BAT54
L
V
IN
V
OUT
C
10 ꢀ H
IN
C
OUT
1 ꢀ F
10 ꢀ F
I
LED
5
1
3
SW
V
IN
Electronic Load
FB
R
2
4
ON
SHDN
GND
OFF
Figure 3. Test Circuit
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4
FAN5333A, FAN5333B
TYPICAL CHARACTERISTICS
T = 25°C, C = 4.7 ꢀ F, C
= 0.47 ꢀ F, L = 10 ꢀ H, unless otherwise noted.
A
IN
OUT
100
100
V
OUT
= 15 V
V
OUT
= 9 V
90
80
70
60
90
80
70
60
I
= 40 mA
LED
I
= 40 mA
LED
I
= 10 mA
LED
I
= 30 mA
LED
I
= 30 mA
LED
I
= 20 mA
LED
I
= 20 mA
LED
I
= 10 mA
LED
50
50
5.0
5.5
5.0
5.5
3.0
3.5
4.0
4.5
3.0
3.5
4.0
4.5
2.0
2.5
2.0
2.5
Input Voltage(V)
Input Voltage(V)
Figure 4. Efficiency vs. Input Voltage
Figure 5. Efficiency vs. Input Voltage
300
200
150
ꢃ I
ꢄ 5%
LED
I
ꢄ 5%
V
= 15 V
LED
OUT
C
C
= 10 ꢀ F
= 1 ꢀ F
IN
C
C
C
= 10 ꢀ F
250
200
150
100
50
IN
OUT
= 1 ꢀ F
= 1 ꢀ F
OUT
OUT
T = 25°C
A
100
50
0
V
OUT
= 12.3 V
T = 40°C
A
V
OUT
= 9.3 V
T = 85°C
A
V
= 14.2 V
4.0
OUT
0
5
2
3
4
2.0
2.5
3.0
Input Voltage(V)
3.5
Input Voltage(V)
Figure 6. Maximum Load Current vs. Input Voltage
Figure 7. Maximum Load Current vs. Input Voltage
10.8
2.0
V
OUT
= 15 V
V
IN
= 5.5 V
10.6
V
= 2.2 V
IN
V
OUT
= 15 V
1.8
1.6
10.4
10.2
V
IN
= 3.6 V
V
= 3.6 V
IN
V
IN
= 5.5 V
10.0
9.8
1.4
1.2
V
= 2.2 V
60
IN
9.6
−40 −20
0
20
40
80
80
−40
−20
0
20
40
60
Temperature (5C)
Temperature (5C)
Figure 9. SW Frequency vs Temperature
Figure 8. LED Current vs Temperature
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5
FAN5333A, FAN5333B
TYPICAL CHARACTERISTICS (Continued)
T = 25°C, C = 4.7 ꢀ F, C
= 0.47 ꢀ F, L = 10 ꢀ H, unless otherwise noted.
A
IN
OUT
25
20
15
V
OUT
= 15 V
L = 10 ꢀ F
C
C
= 10 ꢀ F
IN
OUT
IN
= 1 ꢀ F
V
= 2.7 V
10
5
0
5
3
4
2
Time (100 ms/div)
Input Voltage(V)
Figure 10. Load Current vs. Input Voltage
Figure 11. Start−Up Response
BLOCK DIAGRAM
V
IN
SHDN
4
SW
1
5
Shutdown
FB
Circuitry
+
Over
Voltage
−
1.15 x V
REF
Thermal
Shutdown
R
−
3
FB
Error
Amp
+
n
+
Comp
Driver
Q
R
R
S
−
Reference
S
Ramp
Generator
Current Limit
Comparator
−
+
Oscillator
+
30mꢂ
Amp
−
2
GND
Figure 12. Block Diagram
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6
FAN5333A, FAN5333B
CIRCUIT DESCRIPTION
APPLICATIONS INFORMATION
Setting the Output Current
The FAN5333A/FAN5333B is a pulse−width modulated
(PWM) current−mode boost converter. The FAN5333A/
FAN5333B 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,
1.5 MHz. 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 band− gap 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 30 mꢂ 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.
The internal reference (V ) is 110 mV (Typical) for
REF
FAN5333A and 315 mV (Typical) for FAN5333B. The
output current is set by a resistor divider R connected
between FB pin and ground. The output current is given by:
VFB
R
ILED
+
(eq. 1)
Inductor Selection
The inductor parameters directly related to device
performances are saturation current and dc resistance. The
FAN5333A/ FAN5333B operates with a typical inductor
value of 10 ꢀ H. The lower the dc resistance, the higher the
efficiency. Usually a trade−off between inductor size, cost
and overall efficiency is needed to make the optimum
choice.
The inductor saturation current should be rated around
1 A, in an application having the LED current near the
maximum current as indicated in “Typical Performance
Characteristics”. The peak inductor current is limited to
1.5 A by the current sense loop. 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:
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.
Table 5. RECOMMENDED INDUCTORS
Inductor
Value
10 ꢀ H
10 ꢀ H
Vendor
Part Number
Comment
TDK
SLF6025&−100M1R0
LQH66SN100M01C
Over−Voltage Protection
MURATA
Highest
Efficiency
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.
10 ꢀ H
COOPER
SD414−100
Small Size
Capacitors Selection
For best performance, low ESR input and output
capacitors are required. Ceramic capacitors of C = 10 ꢀ F
OPEN−CIRCUIT PROTECTION
IN
As in any current regulator, if the feedback loop is open,
the output voltage increases until it is limited by some
additional external circuitry. In the particular case of the
FAN5333, the output voltage is limited by the switching
transistor breakdown at around 45 V, typically (assuming
and C
= 1 ꢀ F placed as close to the IC pins, are required
OUT
for the maximum load (65 mA). For the lighter load
(≤20 mA) the capacitances may be reduced to C = 4.7 ꢀ F
IN
and C
= 0.47 ꢀ F or even to 0.1 ꢀ F, if higher ripple is
OUT
acceptable. The output capacitor voltage rating should be
according to the V setting. Some capacitors are
that C
and the Schottky diode rating voltage are higher).
OUT
OUT
Since at such high output voltage the output current is
inherently limited by the discontinuous conduction mode, in
most cases, the switching transistor enters non−destructive
breakdown and the IC survives.
However, to ensure 100% protection for LED
disconnection, we recommend limiting V
suggested in the table below:
Table 6. RECOMMENDED CAPACITORS
Capacitor Value
0.47 ꢀH
Vendor
Panasonic
MURATA
MURATA
Part Number
ECJ−3YB1E474K
GRM21BR61E105K
GRM21BR61A106K
with an
OUT
1 ꢀ H
external Zener diode or stopping the boost switching with an
external voltage supervisory circuit.
10 ꢀ H
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7
FAN5333A, FAN5333B
Diode Selection
2. Dimming Using DC Voltage
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. Care
An external adjustable DC voltage (See Figure 15)
between 0 V to 2 V can control the LED’s current from
15 mA to 0 mA, respectively.
FAN5333B
FAN5333A
FB
FB
V
DC
should be taken to avoid any short circuit of V
to GND,
V
DC
OUT
4.7 kꢂ
90 kꢂ
even with the IC disabled, since the diode can be instantly
damaged by the excessive current
15 ꢂ
1.6 kꢂ
90 kꢂ
5 ꢂ
Figure 15. Dimming Using DC Voltage
BRIGHTNESS CONTROL
1. Dimming Using PWM Logic Signal
A PWM signal applied to SHDN (See Figure 14) can
control the LED’s brightness in direct dependence with the
duty cycle. The maximum frequency should not exceed
1kHz to ensure a linear dependence of the LED’s average
current. The amplitude of the PWM signal should be suitable
to turn the FAN5333 ON and OFF. Alternatively, a PWM
logic signal can be used to switch a FET ON/OFF to change
the resistance that sets the LED’s current (See Figure 14).
Adjusting the duty cycle from 0% to 100% results in varying
3. Dimming Using Filtered PWM Signal
This method allows the use of a greater than 1 kHz PWM
frequency signal with minimum impact on the battery
ripple. The filtered PWM signal (See Figure 16) acts as an
adjustable DC voltage as long as its frequency is
significantly higher than the corner frequency of the RC low
pass filter.
FAN5333A
the LED’s current between I
and I
.
MIN
MAX
FB
20 kꢂ
15 kꢂ
0.1 ꢀF
Where:
1.6 kꢂ
5 ꢂ
VFB
RMIN
VFB
MIN ø RSET
IMIN
+
and IMAX +
(eq. 2)
R
FAN5333B
FB
FAN5333
20 kꢂ 15 kꢂ
0.1 ꢀF
4.7 kꢂ
SHDN
15 ꢂ
Figure 16. Dimming Using Filtered PWM Signal
Figure 13. Dimming Using a PWM Signal
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.
FAN5333
PCB LAYOUT RECOMMENDATIONS
FB
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 FB pin connection should be routed away
from the inductor proximity to prevent RF coupling. A PCB
with at least one ground plane connected to pin 2 of the IC
is recommended. This ground plane acts as an
electromagnetic shield to reduce EMI and parasitic coupling
between components.
R
SET
R
MIN
Figure 14. Dimming Using a PWM Logic Signal
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8
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
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically
disclaims any and all liability, including without limitation special, consequential or incidental damages. ON Semiconductor does not convey any license under its patent rights nor the
rights of others.
© Semiconductor Components Industries, LLC, 2019
www.onsemi.com
onsemi,
, and other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates
and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property.
A listing of onsemi’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. onsemi reserves the right to make changes at any time to any
products or information herein, without notice. The information herein is provided “as−is” and onsemi makes no warranty, representation or guarantee regarding the accuracy of the
information, product features, availability, functionality, or suitability of its products for any particular purpose, nor does onsemi assume any liability arising out of the application or use
of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products
and applications using onsemi products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information
provided by onsemi. “Typical” parameters which may be provided in onsemi data sheets and/or specifications can and do vary in different applications and actual performance may
vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. onsemi does not convey any license
under any of its intellectual property rights nor the rights of others. onsemi products are not designed, intended, or authorized for use as a critical component in life support systems
or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should
Buyer purchase or use onsemi products for any such unintended or unauthorized application, Buyer shall indemnify and hold onsemi and its officers, employees, subsidiaries, affiliates,
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Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
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