MP5414 PMU for 3D Glasses The Future of Analog IC Technology DESCRIPTION FEATURES The MP5414 is a highly-efficient fully-integrated PMU with a current-mode step-up converter, four single-pole/double-throw switches, low drop-out, and a battery charger designed for battery-powered supply applications. BOOST • 1.8V Low Voltage Start-Up • 1.8V to 5.5V Input Range • Output Disconnect • Integrated Power MOSFET and Schottky Diode • Variable Frequency Control • <1μA Shutdown Current • Current Mode Control with Internal Compensation • Inrush Current Limiting and Internal SoftStart • Input Under-Voltage Lockout The step-up converter can start-up from an input voltage as low as 1.8V. It uses a currentlimited variable-frequency control algorithm to optimize efficiency and minimize external component size and cost. The internal lowresistance N-Channel MOSFET switch can withstand up to 10V, allowing the MP5414 to produce a high output voltage with high efficiency from a dual-cell NiCd/NiMH or singlecell Li-ion battery. In addition, the step-up converter can disconnect all loads from the input DC power supply. The charger features constant-current and constant-voltage charging modes with a programmable charge current (50mA to 300mA), trickle-charge capability, and a chargestatus indicator. Charging is enabled with an input voltage greater than 3.5V, and is disabled when unplugged from the AC adaptor. The charger does not need an external reverseblocking diode. The low-dropout linear regulator operates with low noise from a 2.7V-to-6.5V input voltage, and regulates the output voltage with 2% accuracy from 1.25V to 5V. The MP5414 is available in a 4mm x 5mm 28pin QFN package. CHARGER • 0.75% VBATT Accuracy • Low Reverse-Battery Current (< 1µA) • Programmable Charge Current • Charge Status Indication • No External Sense Resistor • No External Reverse Blocking Diode LINEAR REGULATOR • Low 100mV Dropout at 100mA Output • Programmable Output Voltage with 2% Accuracy • Up to 6.5V Input Voltage • High PSRR: 70dB at 1kHz • Better Than 0.001%/mA Load Regulation • Stable With Low-ESR Output Capacitor APPLICATIONS • • • • • 2-Cell and 3-Cell NiCd/NiMH or Single-cell Li-Ion Battery Consumer Products 3D Glass Driver Small LCD Displays Bias Supply Digital Still and Video Cameras Smartphones, Netbooks, and Handheld Video Game Consoles All MPS parts are lead-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. MP5414 Rev.1.12 12/13/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 1 MP5414—PMU FOR 3D GLASSES TYPICAL APPLICATION MP5414 Rev.1.12 12/13/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 2 MP5414—PMU FOR 3D GLASSES ORDERING INFORMATION Part Number* Package Top Marking MP5414DV QFN28 (4x5mm) MP5414 * For Tape & Reel, add suffix –Z (e.g. MP5414DV–Z); For RoHS Compliant Packaging, add suffix –LF (e.g. MP5414DV–LF–Z) PACKAGE REFERENCE MP5414 Rev.1.12 12/13/2012 S3 D C B A S0 TOP VIEW 28 27 26 25 24 23 21 BSTEN BSTISET 3 20 BSTL BSTGND 4 19 BSTIN BATT 5 18 BSTOUT IPGM 6 17 BSTSW CHGGND 7 16 LDOFB CHGIN 8 15 LDOOUT 9 10 11 12 13 14 LDOOUT 2 LDOGND BSTFB LDOIN S1 LDOEN 22 CHGZ 1 CHGGND S2 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 3 MP5414—PMU FOR 3D GLASSES ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance BSTSW, A, B, C, D to BSTGND ...-0.5V to +12V CHGIN to CHGGND .....................-0.3V to +25V LDOIN to LDOGND......................-0.3V to +7.0V LDOFB to LDOGND.... -0.3V to (VLDOOUT + 0.3V) All other Pins................................-0.3V to +6.0V Continuous Power Dissipation (TA = 25°C) (2) ............................................................ 3.1 W Junction Temperature ...............................140°C Lead Temperature ....................................260°C Storage Temperature............... -65°C to +150°C QFN28 (4x5mm) ....................40 ....... 9 .... °C/W Recommended Operating Conditions (3) (4) θJA 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-toambient 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 operation conditions. 4) Measured on JESD51-7 4-layer board. VBSTIN .............................................1.8V to 5.5V VBSTOUT .......................................... VBSTIN to 10V VCHGIN .........................................4.75V to 5.25V VLDOIN ..............................................2.7V to 6.5V VLDOOUT .............................................1.25V to 5V ILDOOUT .....................................250mA Maximum Operating Junction Temp. (TJ). -40°C to +125°C MP5414 Rev.1.12 12/13/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 4 MP5414—PMU FOR 3D GLASSES ELECTRICAL CHARACTERISTICS VBSTIN = 2.4V, VBSTOUT=10V, IBSTOUT=2mA, VCHGIN = VLDOIN = 5V, TA = 25°C, unless otherwise noted. Parameters Symbol Step-Up Converter Operating Input Voltage Minimum Startup Voltage VBSTIN VBSTST Quiescent Current IBSTQ_NS Shutdown Current IN Under Voltage Lockout Under Voltage Lockout Hysteresis Maximum On Time Minimum Off Time SW On-Resistance SW Leakage Current SW Current Limit Schottky Diode Forward Voltage IBSTSD VBSTUVLO Fixed OUT Supply Voltage VBSTFW VBSTOUT_FD FB Input Bias Current Output Disconnect Switch OnResistance Thermal Shutdown Charger Supply Current from VIN Input UVLO Battery Reverse Current to BATT Pin Battery Voltage Regulation IBSTFB MP5414 Rev.1.12 12/13/2012 Typ Max Units 5.5 1.8 V V 28 50 µA 0.1 1.58 1 1.7 µA V 1.8 VBSTOUT=0V IBSTOUT=0, VBSTFB=1.3V, No switching VBSTEN=0V VBSTIN Rising TBSTON TBSTOFF RBSTDS_ON IBSTSW = 200mA IBSTSW_LKG VBSTSW=12V IBSTSW_LIMIT RBSTISET=300kΩ VBSTFB Trickle Current Trickle Threshold Voltage Trickle Voltage Hysteresis CHGZ Low-to-High Threshold CHGZ Sink Current Min 100 FB Voltage (Regulation Mode) Constant Current Regulation Condition RDISC_ON ISUPPLY IBSTFW=100mA Let BSTFB pin floating, 1.8V<VBSTIN<5.5V Connect R-divider to BSTFB, 1.8V<VBSTIN<5.5V VBSTFB = 1.23V 4 400 ICHG TA = 0°C to +50°C, ICHG = 5mA VCHGIN = 5V, VBATT = 3.8V RPGM = 1.6kΩ VCHGIN = 5V, VBATT = 3.8V, RPGM = 1.5kΩ – 7.2kΩ, -40°C < TA < +85°C VCHGIN = 5V, VBATT = 2.3V VBATT Rising Pin Voltage = 0.2 V µs ns Ω µA mA 0.4 0.5 0.6 V 9.7 10 10.3 V 1.20 1.23 1.26 V 1 µA 0.8 Ω 0.7 1.8 150 °C 0.5 2.3 2.8 mA V 2 µA Input=GND or float, VBAT=4V VBATT 7.5 700 0.8 2 180 VBSTOUT=10V ICHG = 0A, Input falling 6 550 0.73 mV 4.16 4.20 4.24 V 225 250 275 mA 90 100 110 %ICHG 5 2.45 10 2.6 190 10 15 2.75 5 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. (5) %ICHG V mV %ICHG mA 5 MP5414—PMU FOR 3D GLASSES ELECTRICAL CHARACTERISTICS (continued) VBSTIN = 2.4V, VBSTOUT=10V, IBSTOUT=2mA, VCHGIN = VLDOIN = 5V, TA = 25°C, unless otherwise noted. Parameters Symbol Condition Dropout Voltage VCHGINVBATT VBATT = 3.8V, ICHG = 150mA, Current drop 10% VBATT = 4.25V Overcharge Protection Thermal Limit (6) LDO Operating Voltage Ground Pin Current Shutdown Current Dropout Voltage (7) Output Voltage Noise Line Regulation Load Regulation PSRR MP5414 Rev.1.12 12/13/2012 Typ Max 0.25 0 ILDOOUT = 1mA ILDOOUT = 1mA–250mA VLDOEN = 0V, VLDOIN = 5V 2.7 6.5 125 155 0.1 1 1.197 1.222 1.246 -40°C ≤ TA ≤ +85°C VLDOOUT = 3V, ILDOOUT = 150mA VLDOOUT = 4V, ILDOOUT = 150mA f = 1kHz, CLDOFB > 0.1μF, ILDOOUT = 1mA ILDOOUT = 1mA, VLDOIN = (VLDOOUT + 0.5V) to 6.5V (8) ILDOOUT = 1mA to 150mA, VLDOIN = VLDOOUT + 0.5V (8) VLDOIN > VLDOOUT +0.5V, CLDOOUT = 2.2μF, VLDOIN(AC) = 100mV, f = 1kHz VLDOIN > VLDOOUT + 0.5V, CLDOOUT = 2.2μF, VLDOIN(AC) = 100mV, f = 1MHz 1.194 1.222 1.249 VBSTEN_H VBSTEN_L IBSTEN μA °C V μA μA V 150 125 mV 300 nV/√ Hz 0.005 %/V 0.001 %/mA 70 dB 30 dB 0.01 155 30 V V μA °C °C 1.5 VLDOEN = 0V, 5V Units V 130 FB Regulation Voltage LDOEN Input High Voltage LDOEN Input Low Voltage LDOEN Input Bias Current Thermal Protection Thermal Protection Hysteresis Control Interface BSTEN/SX Input High Voltage BSTEN/SX Input Low Voltage BSTEN/SX Input Bias Current Min 0.4 1 1.4 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 0.4 1 V V µA 6 MP5414—PMU FOR 3D GLASSES ELECTRICAL CHARACTERISTICS (continued) VBSTIN = 2.4V, VBSTOUT=10V, IBSTOUT=2mA, VCHGIN = VLDOIN = 5V, TA = 25°C, unless otherwise noted. Parameters SPDT Switch Switch On-Resistance Switch On-Resistance Match Between Channels Turn-on Time Turn-off Time Protection Output Disconnect Switch OnResistance Thermal Shutdown Symbol Condition RSPDT_ON VBSTOUT=10V, IA, IB, IC, ID=2mA ∆RSPDT_ON VBSTOUT=10V, IA, IB, IC, ID=2mA TON TOFF RDISC_ON Min Typ Max Units 25 50 Ω 10 Ω RL= 300Ω, CL= 35pF RL= 300Ω, CL= 35pF 80 170 VBSTOUT=10V 0.74 150 ns ns 0.8 Ω °C Notes: 5) ICHG is the target preprogrammed charge current (Die temperature below 110°C). 6) Guarantee by design 7) Dropout Voltage is defined as the input to output differential when the output voltage drops 1% below its normal value 8) VLDOIN = 2.7V for VLDOOUT = 1.25V to 2.2V. MP5414 Rev.1.12 12/13/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 7 MP5414—PMU FOR 3D GLASSES TYPICAL PERFORMANCE CHARACTERISTICS Step-Up Converter VBSTIN = VBSTEN = 2.4V, VBSTOUT = 10V, IBSTOUT = 2mA, L1 = 10µH/150mΩ, unless otherwise noted. MP5414 Rev.1.12 12/13/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 8 MP5414—PMU FOR 3D GLASSES TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Charger VCHGIN = 5V, C3 = C5 = 1µF, TA = 25°C, unless otherwise noted. Battery Charge Curve 4.9 0.30 VBATT 4.2 0.25 3.5 0.20 2.8 IBATT VSTATUS 0.15 2.1 0.10 1.4 0.05 0.7 0.00 0 20 40 60 0.0 80 100 4.30 0.30 4.26 0.24 4.22 0.18 4.18 0.12 4.14 0.06 0.00 Charge Current vs. Battery Voltage CHARGE CURRENT (A) Battery Voltage vs. Input Voltage 0.36 CHARGE CURRENT (A) 0.35 CHARGE CURRENT (A) Charge Current vs. Battery Votlage 0 0.9 1.8 2.7 3.6 4.5 4.10 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 Charge Current vs. Input Voltage 0.36 350 8 0.30 300 7 6 250 0.24 5 200 0.18 4 150 0.12 0.06 0.00 2.9 3.1 3.3 3.5 3.7 3.9 4.1 2 50 1 4.5 6.0 7.5 9.0 0.75 0.65 0.5 152 0.6 148 0.55 0.4 0.5 0.3 144 0.45 0.2 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 MP5414 Rev.1.12 12/13/2012 50 100 150 200 250 300 350 400 156 0.7 0.6 0 160 0.8 0.7 0 Charge Current vs. Temperature Reverse Current vs. Battery Votlage Forward Leakage Current 0.8 3 100 0 Charge Current vs. RPGM Resistance 0.4 2.5 2.8 3.1 3.4 3.7 4 4.3 140 -50 -25 0 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 25 50 75 9 MP5414—PMU FOR 3D GLASSES TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Charger VCHGIN = 5V, C3 = C5 = 1µF, TA = 25°C, unless otherwise noted. MP5414 Rev.1.12 12/13/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 10 MP5414—PMU FOR 3D GLASSES TYPICAL PERFORMANCE CHARACTERISTICS (Continued) LDO VLDOIN = 4.5V, VLDOOUT = 2.85V, C4 = 1μF, CBYP = 0.1μF, C6 = 2.2μF, TA = 25°C, unless otherwise noted. MP5414 Rev.1.12 12/13/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 11 MP5414—PMU FOR 3D GLASSES TYPICAL PERFORMANCE CHARACTERISTICS (Continued) SPDT Switch VBSTIN = VBSTEN = 2.4V, VBSTOUT = 10V, IBSTOUT = 2mA, L1 = 10µH/150mΩ, unless otherwise noted. MP5414 Rev.1.12 12/13/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 12 MP5414—PMU FOR 3D GLASSES PIN FUNCTIONS Pin # Name 1 S2 2 BSTFB 3 BSTISET 4 BSTGND 5 BATT 6 7, 9 8 10 11 12 13 Pin Function C-Channel SPDT Switch Control Input. If the chip is enabled, a logic low input switches C to GND and a logic high input switches C to BSTOUT. Do not leave this pin floating. Step-Up Converter Regulator Feedback. Connect to the tap of an external resistor divider from the output to BSTFB to set the boost converter output voltage. Float this pin to achieve fixed 10V output. Step-Up Converter Constant Peak Current Set. Connect to an external resistor to BSTGND to set the boost converter peak current. Step-Up Converter and SPDT Ground. Charger Output. Constant-Charge–Current Programmer. Connect to an external resistor to ground to IPGM program the charging current in constant-current mode. Do not connect a capacitor to this pin. CHGGND Charger Ground. CHGIN Charger Input Supply. CHGIN receives the AC adapter. CHGZ Open-Drain Charger Status Indicator. Low Dropout Enabled. Drive LDOEN high to turn on the low dropout, drive LDOEN low to LDOEN turn it off. For automatic startup, connect LDOEN to LDOIN. Low Dropout Power Source Input. LDOIN supplies the internal power to the low dropout and LDOIN is the source of the pass transistor. Bypass LDOIN to LDOGND with a 1μF or greater capacitor. LDOGND Low Dropout Ground. 14, 15 LDOOUT 16 LDOFB 17 BSTSW 18 BSTOUT 19 BSTIN 20 BSTL 21 BSTEN 22 S1 23 S0 MP5414 Rev.1.12 12/13/2012 Low Dropout Regulator Output. LDOOUT is the output of the linear regulator. Bypass LDOOUT to LDOGND with a 1μF or greater capacitor. Low Dropout Feedback Input. Connect a resistor divider from LDOOUT to LDOFB to set the output voltage. Step-Up Converter Output Switch Node. BSTSW is the drain node of the internal low-side NChannel MOSFET. Connect the inductor from BSTL to BSTSW to complete the step-up converter. Step-Up Converter Output. Step-Up Converter and SPDT Input Supply. BSTIN pin powers the internal circuitry and is the drain of the internal disconnecting N-channel MOSFET. Bypass locally. Step-Up Converter Inductor Output. BSTL is the source/body of the internal N-channel MOSFET, M3. Connect the inductor from this pin to BSTSW. Step-Up Converter and SPDT On/Off Control Input. A logic high input turns the chip on.. Do not leave this pin floating. B-Channel SPDT Switch Control Input. If the chip is enabled, a logic low input switches B to GND and a logic high input switches B to BSTOUT. Do not leave this pin floating. A-Channel SPDT Switch Control Input. If the chip is enabled, a logic low input switches A to GND and a logic high input switches A to BSTOUT. Do not leave this pin floating. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 13 MP5414—PMU FOR 3D GLASSES PIN FUNCTIONS (continued) Pin # 24 25 26 27 Name A B C D 28 S3 Exposed Pad MP5414 Rev.1.12 12/13/2012 Pin Function A-Channel SPDT Switch Output. B-Channel SPDT Switch Output. C-Channel SPDT Switch Output. D-Channel SPDT Switch Output. D-Channel SPDT Switch Control Input. If the chip is enabled, a logic low input switches D to GND and a logic high input switches D to BSTOUT. Do not leave this pin floating. Connect exposed pad to ground plane in PCB for proper thermal performance. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 14 MP5414—PMU FOR 3D GLASSES FUNCTIONAL BLOCK DIAGRAM L1 C2 BSTL M2 BSTIN BSTSW M3 Driver Driver BSTOUT C1 R1 Regulator BSTOUT Step-up Converter Control Logic M1 Step-up Converter Internal Power Supply - BSTGND + Current Sensing AMP Step-up & SPDT Enable Control Peak Current Control S0 S1 BSTISET - Control Signal EA S2 + BSTEN R2 BSTFB 1.23V S3 SPDT Control BSTOUT A L+ B L- C R+ D R- CHGIN BATT C3 VIN C5 R Battery LDOIN - C4 + LDOOUT VLDOOUT C6 CBYP R3 R4 Bandgap Reference Battery Charger Control LDOFB CHGZ CHGGND RPGM IPGM LDOGND LDOEN Figure 1—Functional Block Diagram MP5414 Rev.1.12 12/13/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 15 MP5414—PMU FOR 3D GLASSES OPERATION The MP5414 is a high-efficiency fully-integrated PMU with a current-mode step-up converter, four single-pole/double-throw (SPDT) switches, low dropout (LDO), and a battery charger designed for low-power battery-operated bias-supply applications. Step-Up Converter Output Disconnection The step-up converter integrates a disconnect switch between the BSTIN and the BSTL pins. The switch is composed of an NMOS and a PMOS in parallel. The step-up converter can disconnect all loads from input DC power supply when the BSTEN pin is connected to ground. Under Voltage Lockout An under-voltage lockout (UVLO) function prevents device startup for values of VBATT < 1.5V. If VBSTIN falls below 1.5V during device operation and battery discharge, the device automatically enters the shutdown mode. Step-Up Converter Start-Up The converter undergoes the following steps after first applying the input signal and followed by the enable signal: 1. PMOS of the disconnect switch turns on, 2. Internal soft-start boosts step-up converter, causing VBSTOUT to rise, 3. VBSTOUT drives the NMOS of the disconnect switch when VBSTOUT reaches threshold. Because the on-resistance of the NMOS is smaller than that of PMOS, the NMOS shorts the PMOS under normal operation to reduce conduction loss. The MP5414 offers both soft-start and inrush current limiting during start-up and under normal operation. converter limits this inrush current by increasing the current limit in three steps, rising from 0A to ILIM/4 in 256 switching cycles, then ILIM/4 to ILIM/2 for the next 256 cycles, before rising to the full current limit. The soft-start time varies greatly with load current; output voltage, and input voltage. Variable Frequency Constant-Peak–Current Operation When the power MOSFET M1 is turned on, the inductor current increases until it hits its current limit. The power MOSFET then turns off for a set minimum-off time. If the feedback pin is still lower than the 1.23V internal reference at the end of this minimum off time, the power MOSFET will turn on again. Otherwise the step-up converter waits until the voltage drops below the threshold before turning on the MOSFET again. This process allows for optimal use of the inductor while minimizing the output ripple, reducing the size of the output capacitor, and maintaining low operating current. Integrated Schottky Diode A high switching frequency requires high-speed rectification for optimum efficiency. The step-up converter integrates a low-voltage–drop schottky diode to reduce the number of external parts to save critical board space. Four SPDT Switches The MP5414 includes four SPDT analog switches, where pins S0 through S3 control the switches, respectively. While the chip is enabled, a logic-low input switches the corresponding channel output to BSTGND. Conversely, a logichigh input switches the channel to BSTOUT. Table 1 shows the control logic. Soft-Start The step-up converter implements a soft-start by charging an internal capacitor with a very weak current source. The voltage on this capacitor, in turn, slowly ramps the peak inductor current limit from zero to the setting value. The step-up MP5414 Rev.1.12 12/13/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 16 MP5414—PMU FOR 3D GLASSES Table 1—Switching Selection Control Logic Control Input BSTEN S0 S1 S2 S3 A B C D L X X X X Open Open Open Open H L L L L BSTGND BSTGND BSTGND BSTGND H H L L L BSTOUT BSTGND BSTGND BSTGND H L H L L BSTGND BSTOUT BSTGND BSTGND H H H L L BSTOUT BSTOUT BSTGND BSTGND H L L H L BSTGND BSTGND BSTOUT BSTGND H H L H L BSTOUT BSTGND BSTOUT BSTGND H L H H L BSTGND BSTOUT BSTOUT BSTGND H H H H L BSTOUT BSTOUT BSTOUT BSTGND H L L L H BSTGND BSTGND BSTGND BSTOUT H H L L H BSTOUT BSTGND BSTGND BSTOUT H L H L H BSTGND BSTOUT BSTGND BSTOUT H H H L H BSTOUT BSTOUT BSTGND BSTOUT H L L H H BSTGND BSTGND BSTOUT BSTOUT H H L H H BSTOUT BSTGND BSTOUT BSTOUT H L H H H BSTGND BSTOUT BSTOUT BSTOUT H H H H H BSTOUT BSTOUT BSTOUT BSTOUT H: High Level MP5414 Rev.1.12 12/13/2012 Switch Output L: Low Level X: Irrelevant www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 17 MP5414—PMU FOR 3D GLASSES VBATT IBATT Soft-Start Time VBATT 4.2V ICHG Thermal Regulation 90% of ICHG 2.6V IBATT Trickle Charging CC Mode CV Mode Charge End Figure 2—Charger Typical Charging Procedure Programming of Charge Current and Battery Full Current Table 2—RPGM and ICHG Relationship RPGM (kΩ) 7.210 5.555 4.010 3.742 2.497 1.873 1.492 1.249 1.080 ICHG (mA) 54.67 70.99 98.70 105.90 159.80 214.30 269.90 323.00 371.00 A resistor (RPGM) connecting the IPGM pin to ground programs the charge current, ICHG. Table 2 and Figure 3 show the relationship between the charge current and the value of the programming resistor. When the battery voltage falls below the tricklecharge threshold (2.6V), the charge current is limited to 10% of the programmed value. After the battery voltage reaches 2.6V, the charger switches to constant-current (CC) mode using a MP5414 Rev.1.12 12/13/2012 Charge Current vs 1/RPGM Resistance 400 350 300 250 200 150 100 50 0 10% of ICHG Charge Start programmed current value, ICHG. Once the battery voltage reaches 4.2V, the charger will operate in the Constant Voltage (CV) mode until the battery is fully charged. CHARGE CURRENT (mA) Charger The charger is enabled when the input supply voltage reaches 3.5V, the UVLO threshold, or the battery voltage—whichever voltage is highest. An internal 500kΩ pull-down resistor connects the CHGIN and CHGGND pins. The charger automatically switches between CC/CV charging algorithms depending on the battery status. Figure 2 shows a typical charging sequence. 0 0.2 0.4 0.6 0.8 1.0 Figure 3—Charge Current vs. 1/RPGM Resistance Charge Status (CHGZ) The open-drain CHGZ pin monitors charge status by connecting to VBATT through an LED, a resistor, or both. The CHGZ pin signals the end-ofcharge—or battery full—when its voltage goes from LOW to HIGH (i.e. the LED turns off), which occurs when ICHG decreases to 10% of the programmed value. Thermal Protection The charger automatically limits the die temperature to 130°C by reducing the current to prevent overheating. The current remains continuous throughout. LDO The MP5414 has an integrated low-current, lownoise, high-PSRR, low-dropout linear regulator. It is suitable for use in devices that require very low noise power supplies and high-PSRR such as PLL VCO supplies for mobile handsets and 802.11 PC Cards, as well as audio codecs and microphones. The LDO uses a PMOS pass element and features internal thermal shutdown. An optional feed-forward capacitor CBYP between LDOFB and LDOOUT pins for improves transient response. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 18 MP5414—PMU FOR 3D GLASSES APPLICATION INFORMATION Components referenced below apply to Typical Application Circuit on page 2. For example, if R1=178kΩ and R2 = 24.9kΩ, then VBSTOUT = 10V. Setting the Step-Up Converter BSTSW Current Limit Selecting the Step-Up Converter Inductor The resistor on the BSTISET pin sets the BSTSW current limit. Figure 4 illustrates the relationship of the BSTSW current limit vs. the BSTISET resistor. In constant-peak-current mode, the inductor current increases until the current limit is reached after the power MOSFET turns on. Since the response delay, the actual BSTSW peak current value exceeds the setting current limit a little. Under same condition, a lower current limit allows lower BSTSW current and higher switching frequency, while a higher current limit allows higher BSTSW current and lower switching frequency. RBSTISET vs. Current Limit 900 800 700 500 400 300 200 100 0 Selecting the Step-Up Converter Input Capacitor The input capacitor, C1, reduces both the surge current drawn from the input supply and the switching noise from the device. Select a capacitor with a switching frequency impedance less than the input source impedance to prevent high-frequency switching current from passing through the input: for example, ceramic capacitors with X5R or X7R dielectrics with low ESR and small temperature coefficients. A 4.7μF or 10μF capacitor will suffice for most applications. Selecting the Step-Up Converter Output Capacitor 600 0 Select an inductor with a DC current rating of at least 40% higher than the maximum input current. For best efficiency, select an inductor with the lowest-possible DC resistance. 200 400 600 800 1000 Figure 4—BSTISET Resistance vs. BSTSW Current Limit Setting the BSTOUT Output Voltage MP5414’s step-up converter features an internal resistor divider that allows the device to output a fixed 10V when the BSTFB is left floating. Connecting the BSTFB pin to the tap of an external resistor divider between BSTOUT to ground otherwise sets the boost converter output voltage, where: VBSTOUT = VBSTFB × The output capacitor, C2, limits the output voltage and improves feedback loop stability. Select an output capacitor with a low switching frequency impedance, such as ceramic capacitors with X7R dielectrics with low ESR characteristics. A ceramic capacitor with a value of less than 10μF will suffice for most applications. Flow Chart of Charger Operation The power-on reset (POR) feature can ensure that the device initiates in a known state. The flow chart in Figure 5 describes the conditions that lead to charger operation modes, such as constant voltage charge (CVC) and constantcurrent charge (CCC). R1 + R2 R2 Where VBSTFB = 1.23V. MP5414 Rev.1.12 12/13/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 19 MP5414—PMU FOR 3D GLASSES Figure 5—Flow Chart of Charger Operation MP5414 Rev.1.12 12/13/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 20 MP5414—PMU FOR 3D GLASSES Setting the LDO Output Voltage Selecting the LDO Input Capacitor The LDO output voltage can be also adjusted by using an external resistor divider (R3 and R4 in the Functional Block Diagram). However, the value of R3 and R4 in series should not exceed 100kΩ to minimize the impact on the internal resistor divider. To accurately set the output voltage, use 10kΩ (±1%) for the low-side resistor (R4), and determine the value of the high-side resistor R3 using the following equation: For proper operation, place a ceramic capacitor (C4) between 1µF and 10µF of dielectric type X5R or X7R between the LDOIN pin and ground. Larger values in this range will help improve line transient response at the cost of increased size. ⎛V − VLDOFB ⎞ R3 = R4 × ⎜ LDOOUT ⎟ V LDOFB ⎝ ⎠ Where VLDOFB is the OUT feedback threshold voltage equal to 1.222V. For example, for a 2.5V output 2.5V − 1.222V R3 = = 10.41kΩ ⎛ 1.222V ⎞ ⎜ ⎟ ⎝ 10kΩ ⎠ You can select a standard 10.5kΩ (±1%) resistor for R3. The following table lists the selected standard R3 values for correlated with their output voltages: Table 3—Adjustable LDO Output Voltage R3 Values VLDOOUT (V) R3 (Ω) 1.25 232 1.5 2.26k 1.8 4.75k 2 6.34k 2.5 10.5k 2.8 13k 3 14.7k 3.3 16.9k 4 22.6k 5 30.9k MP5414 Rev.1.12 12/13/2012 R4 (Ω) 10k Selecting the LDO Output Capacitor For stable operation, use a ceramic capacitor of type X5R or X7R between 1µF and 10µF for the LDOOUT capacitor, C6. Larger values in this range will help improve load transient response and reduce noise at the cost of increased size. Other dielectric types can be used, but their temperature-sensitivity can unduly influence their capacitances. To improve load transient response, add a small ceramic (X5R, X7R or Y5V dielectric) 100nF feed-forward capacitor in parallel with R3. The feed-forward capacitor is not required for stable operation. Layout Considerations Proper layout of the high frequency switching path is critical to limit noise issues and electromagnetic interference. The circuit loop from BSTOUT pin, output capacitor to BSTGND pin is flowing with high frequency pulse current. It must be as short as possible. The BSTIN pin is the power supply input for the internal MOSFET switch gate driver and the internal control circuitry and requires decoupling. For the LDO, the input and output need bypass ceramic capacitors close to the LDOIN pin and LDOOUT pin respectively. Ensure all feedback connections are short and direct. Place the feedback resistors and compensation components as close to the chip as possible. Connect LDOIN, LDOOUT and especially LDOGND respectively to a large copper area to cool the chip to improve thermal performance and long-term reliability. See the MP5414 demo board layout for reference. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 21 MP5414—PMU FOR 3D GLASSES PACKAGE INFORMATION QFN28 (4x5mm) 2.50 2.80 3.90 4.10 23 28 PIN 1 ID SEE DETAIL A PIN 1 ID MARKING 22 1 0.50 BSC PIN 1 ID INDEX AREA 3.50 3.80 4.90 5.10 0.18 0.30 8 15 0.35 0.45 TOP VIEW 14 9 BOTTOM VIEW PIN 1 ID OPTION A 0.30x45º TYP. PIN 1 ID OPTION B R0.25 TYP. 0.80 1.00 0.20 REF 0.00 0.05 DETAIL A SIDE VIEW 3.90 NOTE: 2.70 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX. 4) DRAWING CONFORMS TO JEDEC MO-220, VARIATION VGHD-3. 5) DRAWING IS NOT TO SCALE. 0.70 0.25 0.50 3.70 4.90 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. MP5414 Rev. 1.12 12/13/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 22