MP3398A
Step up, 4 strings, Max. 350mA/string
Analog and PWM dimming, White LED Controller
The Future of Analog IC Technology
DESCRIPTION
The MP3398A is a step-up controller with 4 current channels, which is designed to drive WLED arrays for large-size LCD-panel backlighting applications. It is flexible to expand the number of LED channels by two or more ICs in parallel sharing a single inductive power source.
The MP3398A us peak-current mode with fixed switching frequency. The frequency is programmable by an external tting resistor. The MP3398A drives an external MOSFET to boost up the output voltage from a 5V to 28V input supply. It regulates the current in each LED string to the value t by an external current-tting resistor.
The MP3398A applies 4 internal current sources for current balance. The current matching can achieve
2.5% regulation accuracy between strings. Its low regulation voltage on LED current sources reduces power loss.
The MP3398A can support both analog and PWM dimming independently to meet the different dimming-mode request. In addition, rich protection modes are also integrated including OCP, OTP, UVP, OVP, LED short/open protection, inductor/diode short protection.
The MP3398A is available in SOIC16, TSSOP16-EP and SOIC20 packages. FEATURES
•4-String, Max 350mA/String WLED Driver
•5V to 28V Input Voltage Range
• 2.5% Current Matching Accuracy Between Strings
•Programmable Switching Frequency
•PWM and Analog Dimming Mode •Cascading Capability with a Single Power Source
•LED Open and Short LED Protection
• Programmable Over-Voltage Protection •Recoverable Thermal Shutdown Protection •Over Current Protection
•Inductor/Diode short Protection
• Under-Voltage Lockout
黄河颂作者•SOIC16, TSSOP16-EP and SOIC20 Packages
APPLICATIONS
•Desktop LCD Flat Panel Displays
•Flat Panel Video Displays
•2D/3D LCD TVs and Monitors
All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For MPS green status, plea visit MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks
of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
ORDERING INFORMATION
Part Number Package Top Marking
MP3398AGS*SOIC16 MP3398A MP3398AGF**TSSOP16-EP MP3398A MP3398AGY***SOIC20 MP3398A * For Tape & Reel, add suffix –Z (e.g. MP3398AGS–Z);
** For Tape & Reel, add suffix –Z (e.g. MP3398AGF–Z);
*** For Tape & Reel, add suffix –Z (e.g. MP3398AGY–Z);
PACKAGE REFERENCE
ABSOLUTE MAXIMUM RATINGS (1) VIN .............................................. -0.3V to +30V -0.3V to +6.5V VCC ............................................ -0.3V to +6.8V V LED1 to V LED4 .................................. -1V to +55V -0.5V to +6.5V All Other Pins ............................... –0.3V to VCC Continuous Power Dissipation (T A = 25°C) (2) SOIC16 .................................................... 1.56W TSSOP16-EP………………………………2.78W SOIC20 ………………………………… 1.74W Junction Temperature .............................. 150°C Lead
Temperature ................................... 260°C ESD Capability Human Body Mode (all pins) ................................................................. 3.5kV Recommended Operating Conditions (3) Supply Voltage 5V to 28V LED Current (Backlight) ........... 10mA to 350mA Operating Junction Temp. (T J). -40°C to +125°C Thermal Resistance (4)θJA θJC写作方法
SOIC16……………………………80……35....°C/W TSSOP16-EP……………………45…….10….°C/W SOIC20 ……………………72 ...... 30 ... °C/W Notes:
1) Exceeding the ratings may damage the device. The voltage
is measured with a 20MHz bandwidth limited oscilloscope.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature T J (MAX), the junction-to-ambient thermal resistance θJA, and the ambient temperature T A. The maximum allowable continuous power dissipation at any ambient temperature is calculated by P D (MAX) = (T J (MAX)-T A)/θJA. Exceeding the maximum allowable power dissipation will cau 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.
ELECTRICAL CHARACTERISTICS (5)
V IN =12V, V EN = 5V, T A = 25°C, unless otherwi noted.
Parameters Symbol Condition
Min
Typ
Max
Units曹睿生母
Operating Input Voltage V IN 5 28 V
Supply Current (Quiescent) I Q V IN=12V, V EN=5V, no load
without switching
1.2 1.35 1,5 mA
Supply Current (Operation) I OP V IN=12V, V EN=5V, no load
with switching
天气之子彩蛋
3 5.5
mA
Supply Current (Shutdown) I ST V EN=0V, V IN
=12V
0.01
0.5
泻肺火最快方法
μA
LDO Output Voltage V CC V EN=5V, 7V<V IN<28V,
0<I VCC<10mA
5.4 6
6.6 V
VCC UVLO Threshold V IN_UVLO Rising
Edge 3.6 4 4.4 V VCC UVLO Hysteresis 200 mV EN High Voltage V EN_HIGH V EN Rising 1.8 V EN Low Voltage V EN_LOW V EN Falling 0.6 V STEP-UP CONVERTER
Gate Driver Impedance (Sourcing) V CC=6V,V GATE
=6V
4.5
7
许仙的扮演者Ω
Gate Driver Impedance (Sinking) V CC=6V,I GATE
=10mA
2.5
5
Ω
Switching Frequency f SW R OSC= 115kΩ 459
540
621
kHz R OSC= 374kΩ 150
180
210
kHz
OSC Voltage V OSC 1.20
1.23
1.26
V Maximum Duty Cycle D MAX93 %
Cycle By Cycle ISENSE
Current Limit
Max Duty Cycle 145 180 215 mV
COMP Source Current Limit I COMP SOLI1V<COMP<1.9V
70 μA
COMP Sink Current Limit I COMP SILI1V<COMP<1.9V
17 μA
COMP Trans-conductance G COMPΔI COMP=±10μA
400
人人桌面μA/V
CURRENT DIMMING
PWM Input Low Threshold V PWM_LO V PWM Falling 0.75 V
PWM Input High Threshold V PWM_HI V PWM Rising 1.25 V
Analog Dimming Input Low Threshold
Adim_L R ISET
=9.72k 0.38
0.41
0.44
V
Analog Dimming Input High Threshold Adim_H 1.44
1.49
1.54
V
LED CURRENT REGULATION
ISET Voltage V ISET 1.195 1.22 1.245 V
LEDX Average Current I LED R ISET=30.5kΩ 31.3
32.3
33.3
mA Current Matching (5)I LED
=33.2mA
2.5
车厘子怎么清洗% VCC Max Current Limit Icc_Limit50 75 100 mA
LED FET Resistance R_LED I LED
=10mA
1.7
Ω
ELECTRICAL CHARACTERISTICS (continued)
V IN =12V, V EN = 5V, T A = 25°C, unless otherwi noted.
Parameters Symbol
Condition Min
Typ
Max Units
LEDX Regulation Voltage V LEDX I LED
=330mA
800
mV
I LED
=60mA
285
mV PROTECTION
OVP(Over Voltage Protection) Threshold V OVP_OV Rising
Edge 1.20 1.23 1.26V
OVP(Over Voltage Protection) Threshold HYS V OVP_HYS HYS
80
mV
OVP UVLO threshold V OVP UV Step-up Converter Fails 30 75 120mV LEDX UVLO Threshold V LEDX_UV120 200 280mV
LEDX Over Voltage Threshold V LEDX_OV 5.8 6.3 6.8 V LED Short Fault Cycles T_LED_OV4096
Latch-Off Current Limit V LMT560 640
720mV Thermal Protection Threshold T ST150 °C Thermal Protection Hysteresis 25 °C Notes:
5) Matching is defined as the difference of the maximum to minimum current divided by 2 times average currents.
TYPICAL CHARACTERISTICS
TYPICAL PERFORMANCE CHARACTERISTICS
V IN = 12V, V OUT = 30V, L = 33µH, I LED =120mA/String, 4 strings, T A = 25°C, unless otherwi noted.
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