MP3412 Datasheet PDF - MPS

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MP3412
MPS

Part Number MP3412
Description 1MHz Synchronous Boost
Page 12 Pages


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The Future of Analog IC Technology
DESCRIPTION
The MP3412 is a synchronous, fixed frequency,
high efficiency step-up WLED driver with true
output load disconnect function in a low profile
6-lead Thin-SOT23 package.
The MP3412 can startup from an input voltage as
low as 0.8V and provides in-rush current limiting
as well as output short circuit protection. The
open load protection is also integrated
A switching frequency of 1MHz minimizes overall
solution footprint by allowing the use of tiny, low
profile inductors and ceramic capacitors. Current
mode PWM control with internal compensation
reduces external parts, thereby saving critical
board space.
The device also features low shutdown current of
under 1µA. The true output disconnect feature
allows the output to be completely discharged in
shutdown. It also limits the inrush of current
during start-up, minimizing surge current seen by
the input supply.
The MP3412 is available in 6-pin thin SOT23
package.
MP3412
1.1A, 1MHz Synchronous Boost
WLED Driver with Output Disconnect
FEATURES
Input Range: 0.8V to 4.4V
Output Range: 2.5V to 5.0V
0.8V Low Start-Up Voltage
Internal Power MOSFET and Synchronous
Rectifier
1MHz Fixed Switching Frequency
Current Mode Control with Internal
Compensation
Up to 96% Efficiency
<1µA Shutdown Current
Tiny External Components
True Output Load Disconnect
Inrush Current Limiting and Internal Soft-
Start
Open-Load Protection
Short-Circuit Protection
Available in TSOT23-6 Package
APPLICATION
General LED Illuminations
Cellular Phones
Digital Cameras
Handheld Instruments
Wireless Handsets
GPS Receivers
“Monolithic Power Systems”, “MPS”, and “The Future of Analog IC
Technology” are Registered Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Efficiency
100
95
90 Boost Mode
85
80
75
70 Io=200mA
65 Io=80mA
60
55
50
0123
VIN(V)
LDO Mode
45
MP3412 Rev. 0.9
1/19/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
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MP3412 - 1.1A, 1MHz SYNCHRONOUS BOOST WLED DRIVER WITH OUTPUT DISCONNECT
ORDERING INFORMATION
Part Number*
MP3412EJ
Package
TSOT23-6
Top Marking
7Q
Free Air Temperature (TA)
–20°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP3412EJ–Z).
For RoHS Compliant Packaging, add suffix –LF (e.g. MP3412EJ–LF–Z)
PACKAGE REFERENCE
TOP VIEW
SW 1
6 IN
GND 2
5 OUT
FB 3
4 EN
ABSOLUTE MAXIMUM RATINGS (1)
IN Pin .............................................-0.3V to 4.6V
All other Pins..................................-0.3V to 6.5V
Continuous Power Dissipation (TA = +25°C) (2)
................................................................. 0.56W
Junction Temperature ...............................150°C
Lead Temperature ....................................260°C
Storage Temperature............... -65°C to +150°C
Recommended Operating Conditions (3)
Input Supply Voltage VIN .................0.8V to 4.4V
Output Voltage VOUT........................2.5V to 5.0V
Operating JuncT. TemP. (TJ) ... -20°C to +125°C
Thermal Resistance (4) θJA θJC
TSOT23-6 ..............................220 .... 110 .. °C/W
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.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
MP3412 Rev. 0.9
1/19/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
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MP3412 - 1.1A, 1MHz SYNCHRONOUS BOOST WLED DRIVER WITH OUTPUT DISCONNECT
ELECTRICAL CHARACTERISTICS
VIN = VEN=1.2V, ILED = 200mA, TA = +25°C, unless otherwise noted.
Parameters
Symbol Condition
Minimum Startup Voltage
Maximum Input Voltage
Output Voltage Range
Supply Current (Quiescent)
VST_MIN
VIN_MAX
VOUT
IO
VOUT=0V
VEN=VIN=1.2V, VFB=0.3V,
Measured on OUT pin
Supply Current (Shutdown)
ISD
VEN=VOUT=0V, VIN=3.3V
Measured on IN pin
Operation Frequency
Maximum Duty Cycle
Feedback Voltage
EN Low Threshold
EN High Threshold
EN Input Current
NMOS On Resistance (5)
Synchronous Switch On
Resistance (5)
fSW
DMAX
VFB
VEN_LOW
VEN_HIGH
IEN
RNMOS_ON
RPMOS_ON
VEN Falling
VEN Rising
VEN=6V
VEN=0V
NMOS Current Limit (5)
Over Voltage Protection
Threshold
ILIMIT
VOVP
VOUT=2V, Start-up period
VOUT=3.3V
VSW Rising
Soft-Start Time
Thermal Shutdown (5)
TSS Open loop
Notes:
5) Guaranteed by design.
Min Typ Max Units
0.62 0.72 0.82 V
4.4 V
2.5 5 V
380 600 µA
1 µA
0.90
87
190
0.4
1.05
200
16
0
336
1.20
210
0.62
MHz
%
mV
V
V
nA
nA
m
405 m
0.5 A
1.1 A
4.8 5.1 5.5 V
200 µs
150 °C
MP3412 Rev. 0.9
1/19/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
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MP3412 - 1.1A, 1MHz SYNCHRONOUS BOOST WLED DRIVER WITH OUTPUT DISCONNECT
PIN FUNCTIONS
Pin #
1
2
3
4
5
6
Name
SW
GND
FB
EN
OUT
IN
Pin Function
Power Switch Output. SW is the connection node of the internal NMOS switch and
synchronous switch. Connect the power inductor to SW.
Ground.
Feedback Input to the Error Amplifier. Connect the anode of LED to this pin. The feedback
reference voltage is 0.2V
Enable Control Input.
Step-up Converter Output. OUT is the drain of the Internal Synchronous Rectifier MOSFET.
Connect the LED anode to this pin. OUT pin is completely disconnected from IN pin when
EN is low due to the output disconnect feature.
Battery Supply Input. Must be locally bypassed
MP3412 Rev. 0.9
1/19/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
4
Free Datasheet http://www.datasheet4u.com/



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