MP3301GJ [MPS]
1.3MHz, 700mA, Fixed-Frequency Step-Up Driver for up to 10 White LEDS;
| 型号： | MP3301GJ |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | 1.3MHz, 700mA, Fixed-Frequency Step-Up Driver for up to 10 White LEDS |
| 文件： | 总11页 (文件大小：490K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP3301
1.3MHz, 700mA, Fixed-Frequency
Step-Up Driver for up to 10 White LEDS
DESCRIPTION
FEATURES
The MP3301 is a step-up converter designed to
drive WLEDS arrays from a single-cell, lithium-ion
battery. The MP3301 uses a current-mode, fixed-
frequency architecture to regulate the LED
current, which is measured through an external
current sense resistor. Its low 200mV feedback
voltage reduces power loss and improves
efficiency. The MP3301 turns off in the presence
of an open-circuit over-voltage condition.
Internal Power MOSFET
Drives up to 10 White LEDs in Series
Up to 89% Efficiency
PWM and Analog Dimming
1.3MHz Fixed Switching Frequency
Low 200mV Feedback Voltage
Internal 700mA Current Limit
Open-Load Shutdown
UVLO, Thermal Shutdown
Available in TSOT23-5 Packages
The MP3301 includes under-voltage lockout,
current limiting, and thermal-overload protection
to prevent damage in the event of an output
overload.
APPLICATIONS
Smart Phones
Digital Still Cameras
Small LCDs
The MP3301 is available in a small 5-pin TSOT23
package.
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “Monolithic Power
Systems”, “MPS”, and “The Future of Analog IC Technology” are Registered
Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
L
D
VIN
Cin
Cout
LED
IN
EN
SW
En/Dim
MP3301
FB
GND
Rsense
MP3301 Rev. 1.01
10/28/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS
ORDERING INFORMATION
Part Number
Package
MP3301GJ*
TSOT23-5
* For Tape & Reel, add suffix –Z (e.g. MP3301GJ–Z);
PACKAGE REFERENCE
TSOT23-5
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
TSOT23-5 ............................. 220.... 110.. °C/W
θJA θJC
SW Pin ....................................... –0.5V to +44V
All Other Pins............................. –0.3V to +6.5V
Continuous Power Dissipation .. (TA = +25°C) (2)
TSOT23-5................................................0.57W
Storage Temperature.............. –55°C to +150°C
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.
Recommended Operating Conditions (3)
IN Supply Voltage............................. 2.5V to 6V
SW Pin .............................................. VIN to 36V
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 approximately 1” square of 1 oz copper.
MP3301 Rev. 1.01
10/28/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
2
MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS
ELECTRICAL CHARACTERISTICS
VIN = VEN = 5V, TA = +25°C, unless otherwise noted.
Parameters
Symbol
Condition
Min
Typ Max Units
Operating Input Voltage
Supply Current (Shutdown)
Supply Current (Quiescent)
Switching Frequency
Maximum Duty Cycle
Under Voltage Lockout
IN Under-Voltage Lockout
VIN
2.5
6
V
µA
µA
MHz
%
VEN = 0V
10
VFB = 0.15V
900
1.5
fSW
1.0
92
1.3
VFB = 0V
UVLO
VIN Rising
2.25 2.45
92
V
Under-Voltage Lockout
Hysteresis
mV
Open-Lamp Shutdown
Threshold
VOV
VOV Rising
40
42
44
V
Enable
EN OFF Threshold
EN ON Threshold
VEN Falling
VEN Rising
0.4
V
V
0.6
Minimum EN Dimming
Threshold
VFB = 0V
0.655 0.7 0.845
1.275 1.4 1.425
V
V
Maximum EN Dimming
Threshold
VFB = 0.2V
Feedback
FB Voltage
VEN = 1.5V
VFB = 0.1V
200
mV
nA
FB Input Bias Current
-600
Output Switch
SW On-Resistance (5)
SW Current Limit (5)
Thermal Shutdown (5)
RON
0.5
1.0
Ω
A
Duty Cycle = 60%
150
°C
Notes:
5) Guaranteed by design.
MP3301 Rev. 1.01
10/28/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
3
MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS
PIN FUNCTIONS
Pin #
Name
Pin Function
Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the
power inductor and output rectifier to SW. SW can swing between GND and 36V.
1
2
SW
GND
Ground. Connect exposed pad to GND plane for improved thermal performance.
Feedback Input. Used to regulate the voltage across the current-sense resistor
between FB and GND. Connect a current-sense resistor from the bottom of the LED
string to GND. Connect the bottom of the LED string to FB. The regulation voltage is
200mV.
3
FB
ON/OFF Control and Dimming Command Input. A > 0.6V turns the part on, and < 0.4V
turns the part off. If the EN pin voltage is between 0.7V and 1.4V, VFB is regulated
between 0V and 200mV. To use PWM dimming, apply a 200Hz-to-1kHz square wave
signal with an amplitude >1.5V.
4
5
EN
IN
Input Supply Pin. Requires local bypassing.
MP3301 Rev. 1.01
10/28/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
4
MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.8V, VEN=3.3V, 8 WLEDs in series, 20mA, unless otherwise noted.
MP3301 Rev. 1.01
10/28/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS
OPERATION
The MP3301 uses a constant-frequency, peak-
current–mode, boost-regulator architecture to
regulate up to 10 white LEDs in series. Figure 1
shows how the MP3301 operates.
positive input of the PWM comparator: When
this voltage equals the error amplifier output
(the amplified difference between the 200mV
reference voltage and the feedback voltage),
the power FET turns off.
The MP3301 regulates the SW voltage through
the feedback voltage and the 1.3MHz oscillator.
At the start of each oscillator cycle, the control
circuitry turns the FET on. A stabilizing ramp
added to the output of the current sense
amplifier prevents sub-harmonic oscillations at
duty cycles >50%: The ramp output goes to the
When the feedback voltage starts to drop, the
output of the error amplifier increases, thus
increasing the current flowing through the
power FET. The increased FET power results in
increased power delivered to the output.
Figure 1: Functional Block Diagram
MP3301 Rev. 1.01
10/28/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
6
MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS
APPLICATION INFORMATION
L1
D1
VIN
4.7µH
2.5~6V
C1
C2
4.7µF
0.47µF
LED1~8
IN
EN
SW
En/Dim
MP3301
FB
R1
10Ω
GND
Figure 2: Circuit to Drive 8 WLEDs in Series
Setting the LED Current
Figure 2 shows a typical application circuit. The
8 white LEDs can be driven from a 2.7V-to-6V
supply range at an output current of 20mA. A
0.47µF output capacitor is sufficient for most
applications. A 4.7µH inductor with low direct-
current resistance (DCR) improves efficiency,
while a 4.7µF ceramic capacitor improves input
stability. Use Schottky diodes with fast recovery
times and low forward voltages, preferably
rated at 500mA. The MP3301 has an internal
soft-start to limit the current through VIN at
startup and to also limit the output overshoot.
The feedback resistor, R1, controls the LED
200mV
current. The equation
estimates the
R1
current through the LEDs. Table 1 shows the
resistor selection for a given LED current.
Table 1: ILED vs. R1
ILED (mA)
R1 (Ω)
200
40
1
5
10
20
60
20
10
3.33
The ramped voltage at the current sense
amplifier reduces the current output as the duty
cycle increases. Adding more LEDs increases
the output voltage but reduces the current
delivered to the load.
MP3301 Rev. 1.01
10/28/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
7
MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS
LED Current Programming
Open-Load Protection
Applying a DC voltage between 0.7V and 1.4V
to EN pin programs a feedback voltage
between 0V and 200mV for analog dimming of
LED current. Locally bypass the DC dimming
voltage to limit noise on the feedback reference.
Open-load protection shuts off the MP3301 if
the output voltage goes too high. In cases
where an LED may fail, this results in a zero
feedback voltage. The part runs at the
maximum duty cycle to continue increasing the
output voltage. If the output exceeds 42V, the
MP3301 will shut down. The part will not switch
on again until the device undergoes a power
cycle.
PWM Dimming
Apply a 200Hz-to-1kHz square waveform to the
EN pin to implement PWM dimming. Use a
PWM amplitude of at least 1.5V.
Layout Considerations
For high-frequency PWM dimming (>1kHz),
implement the dimming control shown in Figure
3. Select the RC filter’s cut-off frequency
PCB layout requires care to prevent noise and
electromagnetic interference from the high-
frequency switching paths. Make the current
loop from the IC, output diode, and the output
capacitor as short as possible.
fPWM
≤
. For example, for a PWM frequency of
10
20kHz, use a 20kΩ resistor and 100nF
capacitor. Then
Locally bypass the IN pin, and use an RC filter
when possible to eliminate noise on the IN pin.
See Figure 4 for an implementation example.
VEN VPWM_high DPWM
Where VEN is the EN pin’s DC voltage VPWM_high
is the PWM high level voltage, and DPWM is the
PWM duty cycle. A DC voltage from 0.7V to
1.4V programs the output current from 0% to
100%.
Figure 4: Input Bias Filtering
Figure 3: Control Circuit for High-Frequency
PWM Dimming
MP3301 Rev. 1.01
10/28/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
8
MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS
TYPICAL APPLICATION CIRCUITS
Figure 5: Circuit to Drive 8 WLEDs in Series with a 2.7V-to-6V Input Voltage
Figure 6: Circuit to Drive 10 WLEDs in Series with a 3V-to-6V Input Voltage
MP3301 Rev. 1.01
10/28/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
9
MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS
Figure 7: Circuit to Drive 10 WLEDs in Series with <3V Input Voltage
Use the additional bias circuit to improve the MOSFET ON-resistance at low input voltage.
MP3301 Rev. 1.01
10/28/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
10
MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS
PACKAGE INFORMATION
TSOT23-5
0.95
BSC
0.60
TYP
2.80
3.00
5
4
1.20
TYP
1.50
1.70
2.60
TYP
2.60
3.00
1
3
TOP VIEW
RECOMMENDED LAND PATTERN
0.84
0.90
1.00 MAX
SEATING PLANE
0.09
0.20
0.30
0.50
0.00
0.10
0.95 BSC
SEE DETAIL "A"
FRONT VIEW
SIDE VIEW
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH,
PROTRUSION OR GATE BURR.
GAUGE PLANE
0.25 BSC
3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH
OR PROTRUSION.
0.30
0.50
4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING)
SHALL BE 0.10 MILLIMETERS MAX.
0o-8o
5) DRAWING CONFORMS TO JEDEC MO-193, VARIATION AA.
6) DRAWING IS NOT TO SCALE.
DETAIL “A”
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.
MP3301 Rev. 1.01
10/28/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
11
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