MPQ2122 MPS | Alldatasheet

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6V, 2A, Low Quiescent Current Dual, SYNC Buck Regulator MPQ2122 Rev. 1.0 www.MonolithicPower.com 1 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. The Future of Analog IC Technology

DESCRIPTION

The MPQ2122 is an internally-compensated, 1MHz fixed-frequency, dual PWM, synchronous, step-down regulator. The MPQ2122 operates from a 2.7V-to-6V input, generates an output voltage as low as 0.608V, and has a 45µA quiescent current that makes it ideal for powering portable equipment that runs on a single cell lithium-ion (Li+) battery. The MPQ2122 integrates dual 80m Ω high-side switches and 35m Ω synchronous rectifiers for high efficiency without an external Schottky diode. Peak-current mode control and internal compensation limits the minimum number of readily-available external components. Fault-condition protections include cycle-by-cycle current limiting and thermal shutdown. The MPQ2122 is available in an 8-pin TSOT23-8 package.

FEATURES

  • Dual 2A-Output Current
  • >93% Peak Efficiency
  • >80% Light-Load Efficiency
  • Wide 2.7V-to-6V Operating Input Range
  • 80m Ω and 35mΩ Internal Power MOSFET
  • 1MHz Fixed Switching Frequency
  • Adjustable Output from 0.608V to VIN
  • 180° Phase-Shifted Operation
  • 100% Duty-Cycle Operation
  • 45µA Quiescent Current
  • Cycle-by-Cycle Over-Current Protection
  • Short-Circuit Protection with Hiccup Mode
  • Thermal Shutdown
  • Available in an 8-pin TSOT23-8 Package

APPLICATIONS

  • Small/Handhold Devices
  • DVD Drivers
  • Portable Instruments
  • Smartphones and Feature Phones
  • Battery-Powered Devices All MPS parts are lead-free, halogen 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 100 0.01 0.1 1 10

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 2 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved.

ORDERING INFORMATION

Part Number* Package Top Marking MPQ2122GJ TSOT23-8 See Below * For Tape & Reel, add suffix –Z (e.g. MPQ2122GJ–Z). TOP MARKING AED: product code of MPQ2122GJ; Y: year code; PACKAGE REFERENCE TOP VIEW FB2 SW2 EN1 EN2 FB1 SW1 GND IN TSOT23-8

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 3 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. ABSOLUTE MAXIMUM RATINGS (1) VSW–0.3V (-3V for<10ns) to 6.5V (7.5V for<10ns) Continuous Power Dissipation (TA = +25°C) (2) Recommended Operating Conditions (3) Thermal Resistance (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 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 permanen t damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB.

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 4 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. ELECTRICAL CHARACTERISTICS (5) VIN = VEN = 3.6V, TJ = -40ºC to + 125°C, unless otherwise noted. Typical values are at TJ=25ºC. Parameters Symbol Condition Min Typ Max Units Supply Current (Quiescent) IQ VIN=3.6V, VEN=2V, VFB = 0.65V TJ = +25°C 35 45 55 μA TJ = -40°C to +125°C 30 45 60 Shutdown Current V EN = 0V T J = +25°C 0 1 μA IN Under-Voltage Lockout Threshold Rising edge 2.4 2.5 2.6 V IN Under-Voltage Lockout Hysteresis 300 mV FB Input Current V FB = 0.608V ±10 50 nA EN, HIGH Threshold –40°C ≤ TJ ≤ +125°C 1.2 V EN, LOW Threshold –40°C ≤ TJ ≤ +125°C 0.4 V Internal Soft-Start Time τSS 0.5 ms High-Side Switch, ON- Resistance RDSON_P VIN=5V 80 m Ω Low-Side Switch, ON- Resistance RDSON_N VIN=5V 35 m Ω SW Leakage Current VEN = 0V; VIN = 6V V SW = 0V and 6V TJ = +25°C –1 0 1 μA High-Side Switch, Current Oscillator Frequency Both channels work in CCM 0.8 1 1.2 MHz Phase Shift 180 degree Minimum ON Time(6) τON_MIN 90 ns Minimum OFF Time τOFF_MIN 100 ns Maximum Duty Cycle 100 % Thermal Shutdown Threshold(6) Hysteresis = 30°C 160 °C Notes: 5) Production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization. 6) Guarantee by design

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 5 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS VIN = 5V, VOUT1 = 1.8V, VOUT2 = 1.2V, L = 1.5µH, COUT1=COUT2=22µF, TA = 25°C, unless otherwise noted. 100 0.01 0.1 1 10 100 0.01 0.1 1 10 -0.5 -0.4 -0.3 -0.2 -0.1 0.1 0.2 0.3 0.4 0.5 -0.5 -0.4 -0.3 -0.2 -0.1 0.1 0.2 0.3 0.4 0.5 -60 -40 -20 0 20 40 60 80 100 0.8 0.85 0.9 0.95 1.05 1.1 1.15 1.2 -60 -40 -20 0 20 40 60 80 100 1.5 2.5 3.5 4.5 -60 -40 -20 0 20 40 60 80 100 0 0.5 1 1.5 2 2.5 590 595 600 605 610 615 620 -60 -40 -20 0 20 40 60 80 100

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 6 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VOUT1 = 1.8V, VOUT2 = 1.2V, L = 1.5µH, COUT1=COUT2=22µF, TA = 25°C, unless otherwise noted. 0 0.5 1 1.5 2 2.5

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 7 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VOUT1 = 1.8V, VOUT2 = 1.2V, L = 1.5µH, COUT1=COUT2=22µF, TA = 25°C, unless otherwise noted.

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 8 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VOUT1 = 1.8V, VOUT2 = 1.2V, L = 1.5µH, COUT1=COUT2=22µF, TA = 25°C, unless otherwise noted. VOUT1 1V/div. VOUT1 1V/div. VOUT2 1V/div. VOUT1 1V/div. IL1 500mA/div. VOUT2 5V/div. SW 2V/div. VOUT1 1V/div. IL1 1A/div. VOUT2 5V/div. SW 5V/div. VOUT1 1V/div. IL1 2A/div. VOUT2 5V/div. SW 5V/div. VOUT1 1V/div. VOUT2 1V/div. EN 5V/div. VOUT1 1V/div. VOUT2 1V/div. EN 5V/div. VOUT2 1V/div. EN 5V/div. EN 5V/div. VOUT1 1V/div. VOUT2 1V/div. EN 5V/div. VOUT1 1V/div. VOUT2 1V/div. EN 5V/div. EN on without load IOUT1 = IOUT2= 0A EN on with half load IOUT1 = IOUT2= 1A EN on with full load IOUT1 = IOUT2= 2A 1s/div. EN down without load IOUT1 = IOUT2= 0A EN down with half load IOUT1 = IOUT2= 1A EN down with full load IOUT1 = IOUT2= 2A Vin Power On without Ioad IOUT1 = IOUT2= 0A Vin Power On IOUT1 =1A, IOUT2= 0A Vin Power On IOUT1 = 2A, IOUT2= 0A

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 9 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VOUT1 = 1.8V, VOUT2 = 1.2V, L = 1.5µH, COUT1=COUT2=22µF, TA = 25°C, unless otherwise noted. VOUT1 1V/div. IL1 500mA/div. VIN 5V/div. SW 2V/div. VOUT1 1V/div. IL1 500mA/div. VIN 5V/div. SW 5V/div. VOUT1 1V/div. IL1 500mA/div. VIN 5V/div. SW 5V/div. VOUT1 1V/div. IL1 1A/div. VIN 5V/div. SW 5V/div. VOUT1 1V/div. IL1 2A/div. VIN 5V/div. SW 5V/div. VOUT1 1V/div. IL1 1A/div. VIN 5V/div. SW 5V/div. VOUT1 1V/div. IL1 2A/div. VIN 5V/div. SW 5V/div. VOUT1 1V/div. IL1 1A/div. VIN 5V/div. SW 5V/div. VOUT1 1V/div. IL1 2A/div. VIN 5V/div. SW 5V/div. 40ms/div. Vin Power down IOUT1 = IOUT2= 0A 10ms/div. Vin Power down IOUT1 = 1A, IOUT2= 0A 10ms/div. Vin Power down IOUT1 = 2A, IOUT2= 0A Enable on IOUT1 = IOUT2= 0A Enable on IOUT1 = 1A, IOUT2= 0A Enable on IOUT1 = 2A, IOUT2= 0A 1s/div. Enable down IOUT1 = IOUT2= 0A Enable down IOUT1 =1A, IOUT2= 0A Enable down IOUT1 = 2A, IOUT2= 0A

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 10 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VOUT1 = 1.8V, VOUT2 = 1.2V, L = 1.5µH, COUT1=COUT2=22µF, TA = 25°C, unless otherwise noted. VSW1 5V/div. VOUT1 AC Coupled 100mV/div. IOUT1 1A/div. VSW2 5V/div. VOUT2 AC Coupled 100mV/div. IOUT2 1A/div.

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 11 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. PIN FUNCTIONS Package Pin # Name Description 1 FB2 Feedback 2. Error amplifier input. Connect to the tap of an external resistor divider between the output and GND. Sets the regulation voltage. 2 EN2 Channel 2 Enable. Buck.

3 SW2 Switch Node Connects to the channel 2 internal high-side and low-side power

MOSFETs..Connects to the inductor. 4 EN1 Channel 1 Enable. Buck. 5 GND Ground.

6 SW1 Switch Node Connects to the channel 1 internal high-side and low-side power

MOSFETs..Connects to the inductor. 7 IN Input Supply. Requires a decoupling capacitor to ground to reduce switching spikes. 8 FB1 Feedback 1. Error amplifier input. Connect to the tap of an external resistor divider between the output and GND. Sets the regulation voltage.

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 12 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. Hi-Z Slope Comp COMP1 ISLOPE1 OSC1PH1 Hi-Z Slope Comp COMP2 ISLOPE2 OSC2 SW1 SW2 PH2 FB1 FB2 EN1 EN2 UVLO & Bandgap 0.608V UVLO VIN VIN GND GND MAIN SWITCH PCH SYNCHRONOUS RECTIFIER NCH LOW SIDE GATE DRIVER LOW SIDE GATE DRIVER SYNCHRONOUS RECTIFIER NCH MAIN SWITCH PCH CONTROL LOGIC CONTROL LOGIC PWM PWM INTERNAL SS INTERNAL SS 0.608V 0.608V 1MHz OSCILLATOR Figure 1: Functional Block Diagram

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 13 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. OPERATION MPQ2122 is a fully-integrated, dual-channel, synchronous, step-down converter. Both channels have peak-current modes with internal compensation for faster transient responses and cycle-by-cycle current limits. MPQ2122 is optimized for low-voltage, portable applications where efficiency and small size are critical. 180° Phase-Shift By default, the MPQ2122’s two channels operate at a 180° phase-shift to reduce input current ripple: The smaller current ripple allows for a smaller input bypass capacitor. In CCM, two internal clocks control the switching: The high-side MOSFET turns on at the corresponding CLK’s rising edge. CLK1 CLK 2 SW1 SW2 t CLk1, 2 has a 180o phase shift Figure 2: Clock/Switching Timing However, the switching frequency for each channel falls when operating at low dropout, so the MPQ2122 operates at a default switching frequency of 1MHz with a fixed OFF time. After the input voltage recovers, switching for PWM mode resumes normally and synchronizes with the master oscillator for phase-shifted operation. Light-Load Operation In light loads, the MPQ2122 uses a proprietary control scheme to save power and improve efficiency. The MPQ2122 will turn off the low side switch when inductor current starts to reverse. Then MPQ2122 works in discontinuous conduction mode (DCM) operation. When either channel enters DCM or low- dropout operation, this channel will not be controlled by the internal 1MHz oscillator. Condition Mode CH1 CH2 CH1 CH2

1 Heavy Load 1MHz

CCM,0° Phase

2 Light Load DCM DCM

3 Low Dropout Fixed OFF

4 Heavy

0.95MHz CCM DCM

5 Light

Load DCM 0.95MHz CCM

6 Heavy

0.95MHz CCM Fixed OFF Time

7 Low

0.95MHz CCM

8 Light

9 Low

MPQ2122 has a built-in soft start that ramps up the output voltage at a controlled slew rate to start-up overshoot. The soft-start time is ~0.5ms. Current Limit and Short-Circuit Recovery Each channel’s high-side switch has a 3.5A (typ.) current limit. The MPQ2122 treats any current-limit condition that remains for 400us as a short and enter hiccup mode. The MPQ2122 disables its output power stage in hiccup mode, and then slowly discharges the soft-start capacitor before initiating soft-start. If the short-circuit condition remains, the MPQ2122 repeats this operation till the short circuit disappears and output returns to the regulation level.

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 14 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved.

APPLICATION INFORMATION

External resistor dividers connected to the FB pins set the output voltages. The feedback resistor connected to FB1 (R1) also sets the feedback loop bandwidth (f C). fC does not exceed 0.1×f SW. When using a ceramic output capacitor (C O), set the range to 50kHz and 100kHz for optimal transient performance and good phase margin. W hen using an electrolytic capacitor, set the loop bandwidth no higher than 1/4 the ESR zero frequency (f ESR). fESR is: ESR ESR O 1f 2π RC= ⋅⋅ We suggest using a 600k to 800k resistor for R1 when CO=22μF. R2 is then: OUT R1R2 V 10.608V Table 1: Resistor Values vs. Output Voltage VOUT R1 R2 L COUT (Ceramic) 1.2V 806k Ω 825k Ω 0.47 μH-2.2μH 22 μF 1.5V 806k Ω 549k Ω 0.47 μH-2.2μH 22 μF 1.8V 806k Ω 412k Ω 0.47 μH-2.2μH 22 μF 2.5V 806k Ω 261k Ω 1 μH-4.7μH 22 μF 3.3V 806k Ω 182k Ω 1 μH-4.7μH 22 μF Inductor Selection Use a 1.5µH-to-2.2µH inductor with a DC current rating of at least 1.25 times the maximum load current for most applications. For best efficiency, select an inductor with a DC resistance <20m Ω. See Table 2 for recommended inductors. For most designs, estimate the inductance value using the following equation: OUT IN OUT IN L OSC V( V V)L V ΔIf −= ⋅⋅ Where ∆IL is the inductor ripple current. Select an inductor ripple current equal to approximately 30% of the maximum load current, 2A. The maximum inductor peak current is: L L(MAX) LOAD ΔII= I + 2 Table 2: Suggested Surface-Mount Inductors Vendor Part Number L (μH) DCR (mΩ) SC (A) L x W x H (mm3) WURTH 744777002 2.2 13 6 7.3×7.3×4.5 744310200 2 14.2 6.5 7×6.9×3 TDK RLF7030T- Input Capacitor The input capacitor reduces the surge current drawn from the input and the switching noise from the device. Select an input capacitor with a switching-frequency impedance that is less than the input source impedance to prevent high- frequency-switching current from passing to the input source. Use low-ESR ceramic capacitors with X5R or X7R dielectrics with small temperature coefficients. For most applications, a 22µF capacitor is sufficient. Output Capacitor The output capacitor limits the output voltage ripple and ensures a stable regulation loop. Select an output capacitor with low impedance at the switching frequency. Use ceramic capacitors with X5R or X7R dielectrics. Using an electrolytic capacitor may result in additional output voltage ripple, thermal issues, and requires additional care in selecting the feedback resistor (R1) due to the large ESR. The output ripple ( ∆V OUT) is approximately: OUT IN OUT OUT IN OSC OSC O V( V V) 1ΔVE S R Vf L 8 f C Power Dissipation IC power dissipation plays an important role in circuit design—not only because of efficiency concerns, but also because of the chip’s thermal requirements. Several parameters influence power dissipation, such as:

  • Conduction Loss (Cond)
  • Dead Time (DT)

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MPQ2122 Rev. 1.0 www.MonolithicPower.com 16 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. TYPICAL APPLICATION CIRCUITS Figure 4: Typical Application Circuit

MPQ2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR 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 w hen integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MPQ2122 Rev. 1.0 www.MonolithicPower.com 17 3/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved.

PACKAGE INFORMATION

NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS . 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURR . 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION . 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING ) SHALL BE 0.10 MILLIMETERS MAX. 5) JEDEC REFERENCE IS MO -193, VARIATION BA . 6) DRAWING IS NOT TO SCALE . 7) PIN 1 IS LOWER LEFT PIN WHEN READING TOP MARK FROM LEFT TO RIGHT , (SEE EXAMPLE TOP MARK) TOP VIEW RECOMMENDED LAND PATTERN SEATING PLANE SIDE VIEW DETAIL ''A'' SEE DETAIL '' A'' IAAAA PIN 1 ID See note 7 EXAMPLE TOP MARK