MP3309L [MPS]
2.7V-5.5V Input, 24V Output, fs-Programmable, White LED Driver;
| 型号： | MP3309L |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | 2.7V-5.5V Input, 24V Output, fs-Programmable, White LED Driver |
| 文件： | 总12页 (文件大小：346K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP3309L
2.7V-5.5V Input, 24V Output,
fs-Programmable, White LED Driver
The Future of Analog IC Technology
FEATURES
DESCRIPTION
2.7V-to-5.5V Input Voltage
Analog and PWM Dimming
Programmable Switching Frequency
24V Open-Load Protection
Low 200mV Feedback Voltage with ±1%
Accuracy at Room Temperature
UVLO, Thermal Shutdown
Available in a 1.4×1.8mm FCQFN10
Package
The MP3309L is a WLED step-up converter for
2.7V-to-5.5V input that uses peak-current mode
to regulate the LED current sensed through an
external, low-side resistor. The 200mV
feedback voltage and synchronous rectification
reduces power loss and reduces PCB space
requirements.
The MP3309L features
a
programmable
switching frequency to optimize efficiency. It
supports both analog and PWM dimming.
APPLICATIONS
In addition, the MP3309L has LED open
Feature Phones and Smart Phones
Tablets
<10inch Video Displays
protection,
cycle-by-cycle
current
limit
protection, thermal shutdown protection.
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality Assurance. “MPS”
and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
L1
R3
C2
VIN
C1
SW
GND
BST
C3
IN
VOUT
MP3309L
PWMH
PWMH
PWMH
PWM
EN/PWML
FREQ
FB
R2
R1
GND
MP3309L Rev. 1.01
7/18/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
1
MP3309L―2.7V-5.5V INPUT, 24V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
ORDERING INFORMATION
Part Number*
Package
Top Marking
MP3309LGQG
QFN-10 (1.4mmx1.8mm)
See Below
* For Tape & Reel, add suffix –Z (e.g. MP3309LGQG–Z).
TOP MARKING
CU: product code of MP3309LGQG;
LL: lot number;
PACKAGE REFERENCE
TOP VIEW
FCQFN10 (1.4×1.8mm)
MP3309L Rev. 1.01
7/18/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
2
MP3309L―2.7V-5.5V INPUT, 24V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
ABSOLUTE MAXIMUM RATINGS (1)
VIN ...................................................-0.3V to +6V
VSW, VOUT…………………………..…-1V to +40V
VBST ......................................... -0.3V to VSW +6V
All Other Pins.................................–0.3V to +6V
Junction Temperature...............................150°C
Lead Temperature ....................................260°C
Thermal Resistance (4) θJA
QFN-10 (1.4mm×1.8mm) ..... 140...... 30 °C/W
θJC
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-to-
ambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
(2)
Continuous Power Dissipation ....(TA = 25°C)
QFN-10 (1.4mm×1.8mm)....................... 0.892W
Recommended Operating Conditions (3)
Supply Voltage VIN ..........................2.7V to 5.5V
Operating Junction Temp. (TJ). -40°C to +125°C
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
MP3309L Rev. 1.01
7/18/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
3
MP3309L―2.7V-5.5V INPUT, 24V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
ELECTRICAL CHARACTERISTICS
VIN =3.6V, VEN = VIN, TA = 25°C, unless otherwise noted.
Parameters
Symbol
Condition
Min
Typ
Max Units
STEP-UP CONVERTER
Operating Input Voltage
VIN
IQ
2.7
5.5
1
V
VIN=3.6V, VEN= VIN, no
load with switching
VEN=0V, VIN=3.6V
EN Bit=0, VIN=3.6V
Supply Current (Quiescent)
Supply Current (Shutdown)
420
μA
μA
μA
IST
68
Input UVLO Threshold
Input UVLO Hysteresis
EN High Voltage
VIN_UVLO
Rising Edge
2.5
V
mV
V
200
VEN_HIGH
VEN_LOW
fSW
VEN Rising
1.2
EN Low Voltage
VEN Falling
ROSC= 200kΩ
0.4
V
Switching Frequency
540
89
640
93
740
kHz
%
Sync Mode, 600kHz
Non-sync Mode,
600kHz
Maximum Duty Cycle
DMAX
90
95
Feedback Regulation Voltage
VREF Ramp-Up Time
198
200
320
202
mV
VREF
tSTEP
μs
POWER SWITCH
RDSON_M
RDSON_S
Main Switch On-Resistance
Sync Switch On-Resistance
CURRENT DIMMING
VIN=3.6V
VIN=3.6V
0.3
0.5
0.5
0.8
Ω
Ω
PWMH Input Low Threshold
PWMH Input High Threshold
PWML Shutdown Time
PROTECTION
VPWM_LO
VPWM_HI
tSD
VPWM Falling
0.4
V
V
VPWM Rising
1.2
EN/PWML High to Low
20
ms
OVP
22.5
1.1
24
2
25.5
V
V
OVP Voltage
VOVP
Hysteresis
Cycle-Cycle Current Limit
Startup Current Limit
ILIM
1.6
0.85
5
A
ILIM_START
TLIM_HALF
VOVP_UV
tST
Max Duty Cycle
A
Time Step for Half Current Limit
OVP UVLO Threshold
ms
V
1.24
150
25
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
°C
°C
MP3309L Rev. 1.01
7/18/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
4
MP3309L―2.7V-5.5V INPUT, 24V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, 7 LEDs, L = 10µH, TA = 25°C, unless otherwise noted.
MP3309L Rev. 1.01
7/18/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
5
MP3309L―2.7V-5.5V INPUT, 24V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
PIN FUNCTIONS
Pin #
Name
Description
Analog Dimming Input. >20kHz PWM signal is recommended if using a PWM signal
input for analog dimming.
1, 10
PWMH
Input Supply Pin. Provides power for internal power and logic circuits. Must be locally
bypassed.
2
3
4
VIN
PWM Brightness Control/Enable. Apply a PWM signal for PWM dimming. The LED
current dimming ratio is proportional to the PWM frequency—a lower dimming
frequency results in a smaller dimming current. For most applications, use a frequency
range of 200Hz to 2kHz. A low-level signal longer than 20ms will shutdown the IC.
EN/PWML
RFEQ
Switching Frequency Set. Connect a resistor between this pin and GND to program
the converter switching frequency. Do not leave this pin floating.
LED Current Feedback. Regulates the voltage across the current sense resistor
between FB and GND to 200mV.
5
6
7
8
9
FB
GND
SW
Ground.
Power Switch Node. Drain of the internal low-side MOSFET. Connect the power
inductor between SW and VIN pin.
VOUT
BST
Output Voltage. Internally connected to the source of the synchronous MOSFET.
Booststrap. Connect a capacitor between SW and BST pin to provide the synchronous
MOSFET gate driver.
MP3309L Rev. 1.01
7/18/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
6
MP3309L―2.7V-5.5V INPUT, 24V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
BST
VIN
VOUT
BG&Logic
EN
Control Unit
Detect
M2
PWMH
Regulator
PWML
LED
Open/OTP
SW
OSC
PWM
Control
LED
VREF&DPWM
RAMP
M1
PWMH
VREF
DPWM
GND
VREF
EA
PWM
Comparator
EN/
PWML
OSC
OSC
FB
Figure 1: Functional Block Diagram
MP3309L Rev. 1.01
7/18/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
7
MP3309L―2.7V-5.5V INPUT, 24V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
OPERATION
The MP3309L uses peak-current-mode control
to regulate the current through the WLED string.
At the start of each oscillator cycle, the control
circuit turns on the low-side MOSFET (LS-FET,
M1). A stabilizing ramp added to the output of
the current-sense amplifier, which then feeds
into the positive input of the PWM comparator,
prevents sub-harmonic oscillations at duty
cycles greater than 50%. When the input to the
PWM comparator equals the output voltage of
the error amplifier. M1 turns off. Then the
inductor current flows through the synchronous
power MOSFET, which forces the inductor
current to decrease.
Where Ddim is the PWM duty cycle, and Iset is
the LED current amplitude. When PWM signal
is high, the converter operates in normal mode.
Conversely, when the PWM amplitude is low,
the converter stops switching. Make sure that
the PWM-signal low-level time is less than
20ms or the IC will shutdown. Use a 100Hz-to-
2kHz PWM-dimming frequency for most
dimming ratio requests.
For analog dimming, connect the PWM
dimming signal on PWMH pin, an internal RC
filter filters the PWM signal. The LED current
amplitude equals Iset×Ddim, where Ddim is the
PWM duty cycle and Iset is the LED current
amplitude. Use a >20kHz PWM signal to
improve filtering performance.
The voltage at the output of the error amplifier
is the amplified difference between the 200mV
reference voltage and the feedback voltage. If
the feedback voltage starts to drop, the output
of the error amplifier increases, increasing the
current flowing through the M1, thus increasing
the power to the inductor and output power.
This method accurately regulates the LED
current.
Open-String Protection
The MP3309L monitors the VOUT pin for open-
string protection. If the LED string is open, the
feedback voltage is lower than the reference
voltage. The COMP then rises and charges the
output capacitor until the VOUT voltage
reaches the protection point, VOVP.
System Startup
The IC stops switching when VOUT reaches the
OVP threshold, the IC resumes function when
When enabled, The MP3309L checks safety
limits, including UVLO and over-temperature
protection (OTP), over-current protection. If all
the protection tests pass, the chip then starts
boosting the step-up converter with an internal
soft-start. During the soft-start, the current limit
drops to 0.85A during startup to prevent a large
inrush current. This low-current-limit time lasts
for 5ms after the IC is enabled.
VOUT drops below the threshold.
Input Under-Voltage Protection
When VIN exceeds 2.5V, the converter starts to
charge the internal reference and provides
power to the internal control circuitry. There is
UVLO hysteresis, approximately 200mV, as
VIN falls. The IC shuts down when the input
voltage drops below 2.3V.
Dimming Control
Thermal-Shutdown Protection
The MP3309L provides two dimming methods:
PWM and analog dimming mode.
Thermal shutdown prevents the IC from
operating at exceedingly high temperatures.
When the die temperature exceeds the upper
threshold (TST), the IC shutdowns and resumes
normal operation when the die temperature
drops below lower threshold. Typically, the
hysteresis is 25°C.
For PWM dimming, apply a PWM signal to the
EN/PWML pin. The LED current is then
segmented as per the PWM signal and the
average LED current equals:
Iset Ddim
MP3309L Rev. 1.01
7/18/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
8
MP3309L―2.7V-5.5V INPUT, 24V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
APPLICATION INFORMATIO
boost converter works in continuous-conduction
mode with high efficiency and good EMI
performance.
Selecting the Switching Frequency
The switching frequency of the step-up
converter can be programmed from 300kHz to
1.2MHz. A resistor on the OSC pin sets the
internal oscillator frequency for the step-up
converter as per the equation below:
Calculate the required inductance value using
the equation:
η VOUT D(1 D)2
L
2 fSW ILOAD
120000
f
SW(kHz)
V
IN
D 1
ROSC(k)
VOUT
For instance, if ROSC=200kꢀ, the switching
frequency is to 600kHz.
Where VIN and VOUT are the input and output
voltages, fSW is the switching frequency, ILOAD is
the LED load current, and η is the efficiency.
Setting the LED Current
The switching current for peak-current mode.
To avoid hitting the current limit, the worst-case
inductor peak current should be less than 80%
of the current limit, ILIM.
Set the LED current through the current-setting
resistor on the FB pin.
VREF(V)
ILED(mA)
1000
RFB()
Selecting the Output Capacitor
For instance, if VREF=200mV, and RFB=10ꢀ, the
LED current is 20mA. Do not leave the FB pin
floating.
The output capacitor keeps the output voltage
ripple small and ensures feedback loop stability.
The output capacitor impedance must be low at
the switching frequency. Ceramic capacitors
with X7R dielectrics are recommended for their
low ESR characteristics. Selection must also
account for the capacitance’s dependence on
the voltage rating; with a DC bias voltage, the
capacitor can lose as much as 50% of its
capacitance at its rated voltage rating. Leave a
sufficient voltage rating margin when select the
component.
Selecting the Input Capacitor
The input capacitor reduces the surge current
drawn from the input supply and the switching
noise from the device. The input capacitor
impedance at the switching frequency should
be less than the input source impedance to
prevent the high-frequency switching current
from passing through to the input. Use ceramic
capacitors with X5R or X7R dielectrics for their
low ESR and small temperature coefficients.
For most applications, use a 2.2µF-to-10μF
ceramic capacitor.
Too-low or too-high capacitance will cause loop
instability. For most applications, select a
capacitor in the range of 0.1µF to 1μF.
Layout Considerations
Selecting the Inductor
The MP3309L requires an inductor to boost its
output voltage. A larger value inductor results in
less ripple current, lowering both the peak-
inductor current and the stress on the internal
N-channel MOSFET. However, the larger
inductor is physically larger, has a higher series
resistance, and a lower saturation current.
Careful attention must be paid to the PCB
board layout and components placement.
Proper layout of the high frequency switching
path is critical to prevent noise and limit
electromagnetic
interference.
The
loop
consisting of MP3309L’s internal low-side
MOSFET, synchronous MOSFET, and output
capacitor contains a high-frequency ripple
current—minimize this loop. Place the input and
output capacitor should as to the IC as possible.
Choose an inductor that does not saturate
under the worst-case load conditions. Select
the minimum inductor value to ensure that the
MP3309L Rev. 1.01
7/18/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
9
MP3309L―2.7V-5.5V INPUT, 24V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE
TYPICAL APPLICATION CIRCUITS
L1
22 H
R3
VIN
C1
C2
4.7 F/10V
10nF
SW
GND
BST
OUT
IN
C3
0.47 F
/50V
MP3309L
PWMH
PWMH
PWMH
7*LEDs
EN/PWML
PWM
FREQ
FB
R2
100k
R1
10
GND
Figure 2: Typical Application for Single String 7LEDs
L1
22 H
R3
VIN
C1
C2
10nF
SW
GND
BST
OUT
3X3 LED Array
IN
C3
MP3309L
0.47 F
/16V
PWMH
PWMH
PWMH
EN/PWML
PWM
FREQ
FB
R2
150k
R1
3.3
GND
Figure 3: Typical Application for 3X3 LED Array
MP3309L Rev. 1.01
7/18/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
10
MP3309L―2.7V-5.5V INPUT, 24V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE
L1
22 H
R3
VIN
C1
C2
4.7 F/10V
10nF
SW
GND
BST
OUT
IN
C3
R4
2k
MP3309L
0.47 F
/50V
PWMH (pin 1)
PWMH (pin 10)
PWMH
7*LEDs
EN/PWML
PWM
FREQ
FB
R2
100k
R1
10
GND
Figure 4: Typical Application for More Noise Robust Test
MP3309L Rev. 1.01
7/18/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
11
MP3309L―2.7V-5.5V INPUT, 24V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE
PACKAGE INFORMATION
QFN-10 (1.4mmX1.8mm)
0.15
0.25
1.30
1.50
0.45
0.55
8
10
PIN 1 ID
MARKING
0.35
0.45
PIN 1 ID
0.10x45?TYP.
7
1
2
1.70
1.90
0.40
BSC
PIN 1 ID
INDEX AREA
6
5
3
BOTTOM VIEW
TOP VIEW
1.30
0.80
1.00
0.20 REF
0.00
0.05
0.80
0.70
SIDE VIEW
1.70
NOTE:
0.70
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE0.10 MILLIMETER MAX.
4) JEDEC REFERENCE IS MO-220.
0.20
0.40
5) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not
assume any legal responsibility for any said applications.
MP3309L Rev. 1.01
7/18/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
12
相关型号：
©2020 ICPDF网 联系我们和版权申明