MP3309 [MPS]
2.7V-5.5V Input, 35V Output White LED Driver;
| 型号： | MP3309 |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | 2.7V-5.5V Input, 35V Output White LED Driver |
| 文件： | 总11页 (文件大小：367K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP3309
2.7V-5.5V Input, 35V Output
White LED Driver
The Future of Analog IC Technology
FEATURES
DESCRIPTION
2.7V-to-5.5V Input Voltage
The MP3309 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.
Analog and PWM Dimming
Programmable Switching Frequency
Low 200mV Feedback Voltage with ±1%
Internal Soft Start
UVLO, Thermal Shutdown, OCP
Available in a 1.4mm ×1.8mm QFN-10
package
The MP3309 features
a
programmable
switching frequency to optimize efficiency. It
supports both analog and PWM dimming.
APPLICATIONS
Feature Phones and Smart Phones
Tablets
<10inchVideo Displays
In addition, the MP3309 has LED open
protection,
protection, Under voltage protection and
thermal shutdown protection
cycle-by-cycle
current
limit
All MPS parts are lead-free, halogen free, and adhere to the RoHS
directive. For MPS green status, please visit MPS website under Quality
Assurance.
.
“MPS” and “The Future of Analog IC Technology” are Registered
Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Typical Application Circuit
MP3309 Rev. 1.02
5/21/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
1
MP3309 2.7V-5.5V INPUT, 35V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
ORDERING INFORMATION
Part Number
Package
Top Marking
MP3309GQG*
QFN-10 (1.4mm×1.8mm)
BM
* For Tape & Reel, add suffix –Z (e.g. MP3309GQG–Z);
PACKAGE REFERENCE
TOP VIEW
QFN-10 (1.4mm×1.8mm)
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4) θJA
QFN-10 (1.4mm×1.8mm) ..... 140...... 30 °C/W
θJC
VIN ...................................................-0.3V to +6V
VSW, VOUT…………………………..…-1V to +40V
Notes:
VBST ......................................... -0.3V to VSW +6V
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.
All Other Pins.................................–0.3V to +6V
Junction Temperature...............................150°C
Lead Temperature ....................................260°C
(2)
Continuous Power Dissipation (TA = 25°C)
................... ................... ........................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.
MP3309 Rev. 1.02
5/21/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
2
MP3309 2.7V-5.5V INPUT, 35V 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
0.4
V
Switching Frequency
Maximum Duty Cycle
Feedback Regulation Voltage
POWER SWITCH
ROSC= 200kΩ
Sync Mode, 600kHz
540
89
640
93
740
kHz
%
DMAX
198
200
202
mV
VREF
RDSON_M
RDSON_S
Main Switch On-Resistance
Sync Switch On-Resistance
CURRENT DIMMING
PWMH Input Low Threshold
PWMH Input High Threshold
EN/PWML Shutdown Time
PROTECTION
VIN=3.6V
VIN=3.6V
0.3
0.5
0.5
0.8
Ω
Ω
VPWM_LO
VPWM_HI
tSD
VPWM Falling
0.4
V
V
VPWM Rising
1.2
EN/PWML High to Low
20
ms
33.5
35.5 37.5
V
OVP Voltage
VOVP
Hysteresis
2.5
1.5
0.8
5
Cycle-Cycle Current Limit
Startup Current Limit
ILIM
Max Duty Cycle
Max Duty Cycle
A
A
ILIM_START
TLIM_HALF
VOVP_UV
tST
Time Step for Half Current Limit
OVP UVLO Threshold
ms
V
1.24
150
25
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
°C
°C
MP3309 Rev. 1.02
5/21/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
3
MP3309 2.7V-5.5V INPUT, 35V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, 8 LEDs, ILED=20mA, L = 10µH, TA = 25°C, unless otherwise noted.
100
95
90
6 LED 600kHz
85
8 LED 600kHz
10 LED 600kHz
80
75
70
65
60
3.0 3.2
V
SW
20V/div.
V
SW
V
10V/div.
PWML
5V/div.
V
PWMH
I
5V/div.
LED
20mA/div.
I
LED
20mA/div.
I
I
L
L
200mA/div.
200mA/div.
MP3309 Rev. 1.02
5/21/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
4
MP3309 2.7V-5.5V INPUT, 35V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
PIN FUNCTIONS
Pin #
Name
Description
Dimming input pin for PWM input analog dimming, >20kHz PWM signal is
recommended. Pull 2 pins high together when analog dimming is not used.
PWMH
1,10
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 PWM
duty is proportional to the LED current dimming —a lower dimming duty 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
FB
GND
Ground.
Power Switch Node. Drain of the internal low-side MOSFET. Connect the power
inductor between SW and VIN pin. For non-synchronous mode, connect a Schottky
diode between this pin and VOUT.
7
SW
Output Voltage. Internally connected to the source of the synchronous MOSFET. For
non-synchronous mode, connect a Schottky diode between SW pin and this pin. .
8
9
VOUT
BST
Booststrap. Connect a capacitor between SW and BST pin to provide the
synchronous MOSFET gate driver.
MP3309 Rev. 1.02
5/21/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
5
MP3309 2.7V-5.5V INPUT, 35V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
BG&Logic
EN
Control Unit
Detect
M2
Regulator
EN/PWML
OSC
PWM
Control
VREF&DPWM
DPWM
RAMP
M1
VREF
EA
PWM
Comparator
OSC
Figure 1: Functional Block Diagram
MP3309 Rev. 1.02
5/21/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
6
MP3309 2.7V-5.5V INPUT, 35V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
OPERATION
The MP3309 uses the peak current mode
control architecture to regulate the current
flowing through the white LEDs string. The
operation of the MP3309 can be understood by
referring to the function block diagram.
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 200Hz-to-
2kHz PWM-dimming frequency for most
dimming ratio requests.
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.
For analog dimming, set the LED current
amplitude through an external PWM signal. For
MP3309, implement analog dimming by the
PWMH pins and apply a PWM signal. An
internal RC fliter 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>20kHzPWM signal to
improve filtering performance.
Open-String Protection
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.
The MP3309 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. The OVP
point of MP3309 is 35.5V. Typically, the
hysteresis is 2.5V.
The IC stops switching when VOUT reaches the
OVP threshold, the IC resumes function when
System Startup
V
OUT drops below the threshold.
When enabled, the MP3309 checks safety
limits, including UVLO and over-temperature
protection (OTP), over-current protection after
passing the OVP test. If all the protection tests
pass, the chip then starts boosting the step-up
converter with an internal soft-start. When
enable on, since for soft-start, the current limit
drops to 0.8A during startup to prevent a large
inrush current. This low-current-limit time lasts
for 5ms after the IC is enabled.
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.
Thermal-Shutdown Protection
Dimming Control
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.
The MP3309 provides two dimming methods:
PWM and analog dimming mode.
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 .Where
Ddim is the PWM duty cycle, and Iset is the LED
current amplitude. When PWM signal is high,
MP3309 Rev. 1.02
5/21/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
7
MP3309 2.7V-5.5V INPUT, 35V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
Calculate the required inductance value using
APPLICATION INFORMATION
the equation:
η VOUT D(1 D)2
2 fSW ILOAD
Selecting the Switching Frequency
L
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:
V
IN
D 1
VOUT
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.
120000
f
SW(kHz)
ROSC(k)
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.
For instance, if ROSC=200kꢀ, the switching
frequency is to 600kHz.
Setting the LED Current
Selecting the Output Capacitor
Set the LED current through the current-setting
resistor on the FB pin.
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.
VREF(V)
ILED(mA)
1000
RFB()
For instance, if VREF=200mV, and RFB=10ꢀ, the
LED current is 20mA. Do not leave the FB pin
floating.
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.
Internal Soft Start
When enable on, IL current limit drop to half to
prevent inrush during startup.
Layout Considerations
Selecting the Inductor
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
The MP3309 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.
electromagnetic
interference.
The
loop
consisting of MP3309’s internal low-side
MOSFET, synchronous MOSFET or diode, 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
boost converter works in continuous-conduction
mode with high efficiency and good EMI
performance.
MP3309 Rev. 1.02
5/21/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
8
MP3309 2.7V-5.5V INPUT, 35V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
TYPICAL APPLICATION CIRCUITS
Figure 2: Typical Application for Single String 8LEDs
Figure 3: Typical Application for 3X3 LED Array
MP3309 Rev. 1.02
5/21/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
9
MP3309 2.7V-5.5V INPUT, 35V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
L1
22 H
R3
VIN
C1
C2
4.7 F/10V
10nF
SW
GND
BST
OUT
IN
C3
R4
2k
MP3309
0.47 F
/50V
PWMH (pin 1)
PWMH
7*LEDs
PWMH (pin 10)
EN/PWML
PWM
FREQ
FB
R2
100k
R1
10
GND
Figure 4: Typical Application for More Noise Robust Test
MP3309 Rev. 1.02
5/21/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
10
MP3309 2.7V-5.5V INPUT, 35V OUTPUT, fs-PROGRAMMABLE, WHITE LED DRIVER
PACKAGE INFORMATION
QFN-10 (1.4mmX1.8mm)
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
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.
MP3309 Rev. 1.02
5/21/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
11
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