MP2155

MP2155 MPS | Alldatasheet

Document overview

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Technical content

Single Inductor Buck-Boost Converter with 2.2A Switches MP2155 Rev. 1.0 www.MonolithicPower.com 1 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. The Future of Analog IC Technology

DESCRIPTION

The MP2155 is a highly efficient, low quiescent current Buck-Boost converter, which operates from input voltage above, below and equal to the output voltage. The device provides power solution for products powered by a one-cell Lithium-Ion or multi-cell alkaline battery applications where the output voltage is within battery voltage range. The MP2155 uses a current mode, fixed frequency PWM control for optimal stability and transient response. The fixed 1MHz switching frequency and integrated low R DS(ON) N-channel and P-channel MOSFETs minimize the solution footprint while maintaining high efficiency. To ensure the longest battery life MP2155 has an optional pulse skipping mode that reduces switching frequency under light load conditions. For other low noise applications where variable frequency power save mode may cause interference, the logic control input MODE pin forces fixed frequency PWM operation under all load conditions. The MP2155 operates with input voltage from 2V to 5.5V to provide adjustable output voltage (1.5V to 5V). With an input from 2.7V to 5.5V it can supply a maximum 1A current to load at 3.3V output voltage. The MP2155 is available in small QFN10-3x3mm package.

FEATURES

• High Efficiency up to 95%.
• Load Disconnect During Shutdown
• Input Voltage Range: 2V to 5.5V
• Adjustable Output Voltage from 1.5V to 5V
• 3.3V/1A Load Capability from 2.7V-to-5.5V Vin
• 1MHz Switching Frequency
• Pulse Skipping Mode at Light Load
• Typical 80 μA Quiescent Current
• Internal Loop Compensation for Fast Response
• Internal Soft Start
• OTP, Hiccup SCP
• Available in Small 3x3mm QFN10 Package

APPLICATIONS

• Battery-Powered Products
• Portable Instruments
• Tablet PCs
• POS Systems
• GSM/GPRS
• System Controls 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. TYPICAL APPLICATION

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES MP2155 Rev. 1.0 www.MonolithicPower.com 2 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved.

ORDERING INFORMATION

Part Number* Package Top Marking MP2155GQ* QFN10 (3X3) ADR * For Tape & Reel, add suffix –Z (e.g. MP2155GQ–Z); PACKAGE REFERENCE TOP VIEW 1 10 MODE/ SYNC VCC EN AGND FB SW1 PGND VIN SW2 VOUT EP ABSOLUTE MAXIMUM RATINGS (1) Continuous Power Dissipation (TA = +25°C) (3) Recommended Operating Conditions (4) Thermal Resistance (5) 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 T J (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 P D (MAX) = (T J (MAX)-TA)/θJA. Exceeding the maximum allowable powe r 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.

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES MP2155 Rev. 1.0 www.MonolithicPower.com 3 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved.

ELECTRICAL CHARACTERISTICS

VIN = VCC=VEN=3.3V, TJ = 25°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units VCC rising 1.8 1.9 V Under voltage lockout threshold V UVLO VCC falling 1.60 V Feedback voltage V FB 486 496 506 mV Oscillator frequency 900 1000 1300 kHz Frequency range for synchronization FREQ 1000 2000 kHz Primary current limit 1.8 2.2 A Secondary current limit Isw 1.8 A NMOS switch on resistance R DS(ON)-N 105 m Ω PMOS switch on resistance R DS(ON)-P 120 m Ω Quiescent current I Q V FB=0.65V 80 μA Shutdown current I S V EN=0V 1 μA MODE input low voltage 0.4 V MODE input high voltage 1.2 V EN input low voltage 0.4 V EN input high voltage 1.2 V VEN=3.3V 3.1 μA EN input current I EN VEN=0V 0 μA Thermal shutdown(5) T SHDN 160 ℃ Thermal shutdown hysteresis(5) T HYS 20 ℃ Notes: 5) Guaranteed by engineering sample Characterization, not tested in production.

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES MP2155 Rev. 1.0 www.MonolithicPower.com 4 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. TYPICAL CHARACTERISTICS VIN = 3.3V, VOUT = 3.3V, L = 3.3µH, COUT=2x22uF, TA = +25ºC, unless otherwise noted.

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES MP2155 Rev. 1.0 www.MonolithicPower.com 5 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS VIN = 3.3V, VOUT = 3.3V, L = 3.3µH, COUT=2x22uF, TA = +25ºC, unless otherwise noted.

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES MP2155 Rev. 1.0 www.MonolithicPower.com 6 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.3V, VOUT = 3.3V, L = 3.3µH, COUT=2x22uF, TA = +25ºC, unless otherwise noted. Notes: 6) Tested with 1.8A inductor peak current at 3.3V input point. Under other V IN conditions, it takes the same current limit variation trend with VIN into consideration as “Current Limit vs. Input Voltage” curve shows"

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES MP2155 Rev. 1.0 www.MonolithicPower.com 7 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.3V, VOUT = 3.3V, L = 3.3µH, COUT=2x22uF, TA = +25ºC, unless otherwise noted.

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES MP2155 Rev. 1.0 www.MonolithicPower.com 8 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.3V, VOUT = 3.3V, L = 3.3µH, COUT=2x22uF, TA = +25ºC, unless otherwise noted.

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES MP2155 Rev. 1.0 www.MonolithicPower.com 9 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.3V, VOUT = 3.3V, L = 3.3µH, COUT=2x22uF, TA = +25ºC, unless otherwise noted.

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES MP2155 Rev. 1.0 www.MonolithicPower.com 10 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 3.3V, VOUT = 3.3V, L = 3.3µH, COUT=2x22uF, TA = +25ºC, unless otherwise noted.

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES MP2155 Rev. 1.0 www.MonolithicPower.com 11 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. PIN FUNCTIONS Pin # Name Description 1 VOUT Buck-Boost converter output. 2 SW2 Switch pin-Internal switches are connected to this pin. Connect inductor between SW1 and SW2. 3 PGND Power ground. 4 SW1 Switch pin-Internal switches are connected to this pin. Connect inductor between SW1 and SW2. 5 VIN Supply voltage for power stage. 6 EN ON/OFF control, it’s not recommended to leave this pin float. MODE/ SYNC Operation mode selection. If MODE pin is lo w, the MP2155 automatically switches between PSM and fixed frequency PWM according to the load level. If MODE pin is pulled high, the MP2155 works always in PWM mode. External clock can be applied to MODE pin for changing switching frequency. This pin is sensitive to noise, so it shou ld be strongly pulled up above 1.2V or pulled down below 0.4V. Must NOT leave it float. 8 VCC Supply voltage for control stage. 9 AGND Signal ground, should be connected to PGND externally. 10 FB Feedback to set output voltage. Keeps this pin and associated trace far from noise source like SW. - EP Thermal pad, which is recommended to connected to PGND.

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES MP2155 Rev. 1.0 www.MonolithicPower.com 12 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. Level shift Vc- Boost Buck- Boost Control logic Buck Comparator Current sense Boost Comparator EA FB Vc-Buck SWA SWB SWC VOUT SW1 SW2 Gate drivers Current sense Reverse Comparator Voltage ReferenceEN VIN PGND PSM Control MODE /SYNC Slope Generator Oscillator VCC AGND SWD INPUT OUTPUT Cin Cout L SS Cap Figure 1— Function Block Diagram

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES MP2155 Rev. 1.0 www.MonolithicPower.com 14 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. waveforms the current may be much lower than this value when SWD is turned off because of internal delay. SCP/OCP vs. two current limits There are two current limits in MP2155. The primary one is for steady PWM operation and it’s typically from 2A to 3A, depending on Vin; The secondary one is for limiting inrush current at startup, it’s typically 1.6A to 1.9A, depending on Vin, too. When load is over heavy, the primary limit would protect MP2155 from being over thermal. Therefore Vout would drop due to OCP. If Vout drops below 0.6 times normal output, a hiccup period is initiated to protect MP2155. this is the SCP. In hiccup period, SWA and SWC are turned off while SWB and SWD are turned on. After the hiccup period ends, a soft re-startup begins. Because Vout is below 1V (due to over load or output short), the secondary current takes charge of this process. After Vo rises above 1V, primary current limit get in charge of. Now if load is still over heavy (or output short still exists) such that after SS ends Vout is still below 0.6*V OUT_NORMAL and current hits one of the limits, another hiccup period begins. However if the load recovers to normal value during re-startup so that current doesn’t hit its limit, or, Vout already rises above 0.6*V OUT_NORMAL, the re- startup succeeds, and MP2155 enter normal operation. As to the input/EN startup, the cases are same as the SCP recovery process. Enable The MP2155 has a dedicated enable control pin (EN). The device operates when it is set high. If it is set low the device stops switching, all the internal blocks are turned off. Tie EN to Vin through a resistor for automatic start up. Due to EN bias or leakage current, the value of this resistor should be set to provide EN pin with a current above 10uA. Any signal to drive this pin should be limited to 100uA if the maximum voltage of this signal is above 6.5V. Internal Soft-start When EN pin is pulled high, and at the same time the voltage on Vcc pin is above its UVLO rising threshold MP2155 will start up with Soft-start function to eliminate output overshoot. Soft-start also functions during SCP recovery. Under-Voltage Lockout The under voltage lockout (UVLO) is implement to protect the device from improper operating at insufficient supply voltage. When the supply voltage at VCC is below the UVLO threshold the device is in shutdown mode. The UVLO rising threshold is about 1.8V with 200mV hysteresis. Over-Temperature Protection An internal temperature sensor continuously monitors the IC junction temperature. If the IC temperature exceeds 160ºC typically the device stops operating. As soon as the temperature falls below 140 ºC typically normal operation is restored.

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES MP2155 Rev. 1.0 www.MonolithicPower.com 15 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved.

APPLICATION INFORMATION

Setting the Output Voltage To use MP2155 correctly, A resistor divider must be connected between Vout and GND, and the middle point of the divider connected to FB pin as shown in Typically Application on page 1. 2R)1V V(1R FB OUT ×−= (1) High R2 resistance (eg. 100k Ω) can reduce the power consumption, while lower than 1 MΩ resistance is recommended for R1 for good output accuracy. Inductor Selection The inductor is the key passive component for switching converters. With a buck-boost device, the inductor selection affects the boundary conditions in which the converter works, as buck at the maximum input voltage and as a boost at the minimum input voltage. Two critical inductance values are then obtained according to the following formulas. LREQ)MAX(IN OUT)MAX(INOUT BUCKMIN IFV )VV(VL Δ×× −×=− (2) LREQOUT )MIN(INOUT)MIN(IN BOOSTMIN IFV )VV(VL Δ×× −×=− (3) Where: FREQ: minimum switching frequency ∆IL: the peak-to-peak inductor ripple inductor current. As a rule of thumb, the peak-to-peak ripple can be set at 10%-20% of the output current. The minimum inductor value for the application is the higher one between Equation 2 and Equation 3. In addition to the inductance value the maximum current the inductor can handle must be calculated in order to avoid saturation. LFV2 )VV(VII REQ)MAX(IN OUT)MAX(INOUTOUT BUCKPEAK ××× −×+η=− (4) LFV )VV(V V IVI REQOUT )MIN(INOUT)MIN(IN )MIN(IN OUTOUT BOOSTPEAK ×× +×η ×=− (5) Where η is the estimated efficiency of MP2155. The maximum of the two values above must be considered when selecting the inductor. Input and Output Capacitor Selection It is recommended to use ceramic capacitors with low ESR as input and output capacitors in order to filter any disturbance present in the input line and to obtain stable operation. Minimum values of 10uF for both capacitors are needed to achieve good behavior of the device. The input capacitor must be placed as close as possible to the device. Other Consideration MP2155 employs the classic hiccup mode for SCP. This method has an inherited drawback: if the output short is released at a time closed to SS end, then Vo would has overshoot. To attenuate Vo overshoot at SCP recovery, a forward RC series can be connected in parallel with high side resistor of FB divider, as R3 and C5 in Figure 5 shows. The RC acts as a soft startup when Vo short is released at the time of internal SS’s end. PCB Layout Guide 1. Input and output capacitors should be close to MP2155’s Vin, Vout and PGND pins. 2. The wire connecting input capacitor to Vcc pin should be as short as possible. For better performance in noisy environment, an additional capacitor very close to Vcc pin can be used to bypass noise for Vcc.

MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES NOTICE: The information in this document is subject to change wi thout 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. MP2155 Rev. 1.0 www.MonolithicPower.com 18 1/26/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved.

PACKAGE INFORMATION

QFN10 (3mmX3mm) SIDE VIEW TOP VIEW 110 BOTTOM VIEW 2.90 3.10 1.45 1.752.90 3.10 2.25 2.550.50 BSC 0.18 0.30 0.80 1.00 0.00 0.05

0.20 REF

1.70 0.50 0.25 RECOMMENDED LAND PATTERN

2.90 NOTE:

1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MIL L IMET ER MAX. 4) DRAWING CONFORMS TO JEDEC MO -229, VARIATION VEED-5. 5) DRAWING IS NOT TO SCALE . PIN 1 ID SEE DETAIL A 2.50 0.70 PIN 1 ID OPTION B R0.20 TYP. PIN 1 ID OPTION A R0.20 TYP. DETAIL A 0.30 0.50 PIN 1 ID INDEX AREA