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MP1527DM-LF-Z

hot MP1527DM-LF-Z

MP1527DM-LF-Z

For Reference Only

Part Number MP1527DM-LF-Z
Manufacturer Monolithic Power Systems Inc.
Description IC REG BOOST ADJ 2A
Datasheet MP1527DM-LF-Z Datasheet
Package 14-TSSOP (0.173", 4.40mm Width)
In Stock 26250 piece(s)
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Lead Time Can Ship Immediately
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MP1527DM-LF-Z

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MP1527DM-LF-Z Specifications

ManufacturerMonolithic Power Systems Inc.
CategoryIntegrated Circuits (ICs) - PMIC - Voltage Regulators - DC DC Switching Regulators
Datasheet MP1527DM-LF-Z Datasheet
Package14-TSSOP (0.173", 4.40mm Width)
Series-
FunctionStep-Up
Output ConfigurationPositive
TopologyBoost
Output TypeAdjustable
Number of Outputs1
Voltage - Input (Min)2.6V
Voltage - Input (Max)25V
Voltage - Output (Min/Fixed)3.3V
Voltage - Output (Max)25V
Current - Output2A
Frequency - Switching1.3MHz
Synchronous RectifierNo
Operating Temperature-40°C ~ 85°C (TA)
Mounting TypeSurface Mount
Package / Case14-TSSOP (0.173", 4.40mm Width)
Supplier Device Package14-TSSOP

MP1527DM-LF-Z Datasheet

Page 1

Page 2

MP1527 2A, 1.3MHz Step-Up Converter MP1527 Rev 1.8_8/31/05 Monolithic Power Systems, Inc. 1 Monolithic Power Systems General Description The MP1527 is a 2A, fixed frequency step-up converter in a tiny 16 lead QFN package. The high 1.3MHz switching frequency allows for smaller external components producing a compact solution for medium-to-high current step-up, flyback, and SEPIC applications. The MP1527 regulates the output voltage up to 25V at efficiency as high as 93%. Soft-start, timer-latch fault circuitry, cycle-by-cycle current limiting, and input undervoltage lockout prevent overstressing or damage to external circuitry at startup and output short-circuit conditions. Fixed frequency operation eases control of noise making the MP1527 optimal for noise sensitive applications such as mobile handsets and wireless LAN PC cards. Current-mode regulation and external compensation components allow the MP1527 control loop to be optimized over wide variety of input voltage, output voltage and load current conditions. The MP1527 is offered in a tiny 4mm x 4mm 16 lead QFN and 14 lead TSSOP packages. Features 2A Peak Current Limit Internal 150mΩ Power Switch VIN Range of 2.6V to 25V >93% Efficiency Zero Current Shutdown Mode Under Voltage Lockout Protection Timer-Latch Fault Detection Soft Start Operation Thermal Shutdown Tiny 4mm x 4mm 16 pin QFN Package Evaluation Board Available Applications SOHO Routers, PCMCIA Cards, Mini PCI Handheld Computers, PDAs Cell Phones, Digital and Video Cameras Small LCD Display Ordering Information Part Number Package Temperature MP1527DR QFN16 (4x4) -40° to +85°C MP1527DM TSSOP14 -40° to +85°C EV0034 MP1527DR Evaluation Board ∗ For Tape & Reel, add suffix –Z (e.g. MP1527DR–Z) For Lead Free, add suffix –LF (e.g. MP1527DR–LF–Z) Figure 1: Typical Application Circuit ON/OFF FAULT VIN = 2.6V to 25V VOUT = 3.3V to 25V SS EN FAULT IN BP SGND SW FB PGND COMP

Page 3

MP1527 2A, 1.3MHz Step-Up Converter MP1527 Rev 1.8_8/31/05 Monolithic Power Systems, Inc. 2 Monolithic Power Systems Absolute Maximum Ratings (Note 1) Input Supply Voltage VIN -0.3V to 27V SW Pin Voltage VSW -0.3V to 27V Voltage at All Other Pins -0.3V to 6V Storage Temperature -55°C to +150°C Recommended Operating Conditions IN Input Supply Voltage VIN 2.6V to 25V Step Up Output Voltage 3.3V to 25V Operating Temperature -40°C to +85°C Package Thermal Characteristics Thermal Resistance ΘJA (TSSOP14) 90°C/W Thermal Resistance ΘJA (QFN16) (Note 2) 46°C/W Electrical Characteristics (VIN = 5.0V, TA = 25°C unless specified otherwise) Parameters Conditions Min Typ Max Units IN Shutdown Supply Current VEN<0.3V 0.5 1.0 µA IN Operating Supply Current VEN>2V, VFB=1.1V 0.9 1.2 mA BP Output Voltage VIN = 2.6V to 25V 2.4 V IN Undervoltage Lockout Threshold VIN Rising 2.1 2.4 V IN Undervoltage Lockout Hysteresis 100 mV EN Input Low Voltage 0.3 V EN Input High Voltage 1.5 V EN Input Hysteresis 100 mV EN Input Bias Current 100 nA SW Switching Frequency 1.0 1.3 1.5 MHz SW Maximum Duty Cycle VFB = 1.1V 85 90 % Error Amplifier Voltage Gain 400 V/V Error Amplifier Transconductance 300 µA/V COMP Maximum Output Current Sourcing and Sinking 30 µA FB Regulation Threshold 1.196 1.22 1.244 V FB Input Bias Current VFB=1.22V -100 nA SS Charging Current During Soft-Start 2 µA FAULT Input Threshold Voltage 1.2 V FAULT Output Low Voltage VFB < 1.0V 0.2 V VIN =5V 150 mΩ SW On Resistance VIN =3V 225 mΩ SW Current Limit (Note 3) 2.0 3.0 A SW Leakage Current VSW = 25V 0.5 µA Thermal Shutdown 160 °C Note 1: Exceeding these ratings may damage the device. Note 2: Measured on approximately 1” square of 1oz copper. Note 3: Guaranteed by design. Not tested.

Page 4

MP1527 2A, 1.3MHz Step-Up Converter MP1527 Rev 1.8_8/31/05 Monolithic Power Systems, Inc. 3 Monolithic Power Systems Pin Descriptions COMP NC BP EN Top View PGND PGND SW SW S G N D N C N C IN F B S S F A U L T S G N D 1 2 3 4 5 6 7 8 12 11 10 9 16 15 14 13 1 2 3 4 5 6 7 14 13 12 11 10 9 8 NC NC IN SW PGND SGND FAULT SGND EN BP NC COMP FB SS Table 1: Pin Description QFN Pin TSSOP Pin Name Function 1 10 COMP Compensation Node. COMP is the output of the internal transconductance error amplifier. Connect a series RC network from COMP to SGND to compensate the regulator control loop. 2, 6, 7 1, 2, 11 NC No Connect 3 12 BP Output of the internal 2.4V low dropout regulator. Connect a 10nF bypass capacitor between BP and SGND. Do not apply an external load to BP. 4 13 EN Regulator On/Off Control Input. A logic high input (VEN>1.5V) turns on the regulator, a logic low puts the MP1527 into low current shutdown mode. 5, 13 6, 14 SGND Signal Ground 8 3 IN Input Supply 9, 10 4 SW Output Switching Node. SW is the drain of the internal n-channel MOSFET. Connect the inductor and rectifier to SW to complete the step-up converter. 11, 12 5 PGND Power Ground 14 7 FAULT Fault Input/Output. FAULT is an Input/Output that indicates that the MP1527 detected a fault and shuts the regulator off once a fault is indicated. Connect the FAULT input/outputs together for all MP1527 regulators to force all regulators off when any one regulator detects a fault. Once a fault is detected, cycle EN or the input power to restart the regulator. Pull FAULT to the input voltage through a 100kΩ resistor. Up to 20 FAULT input/outputs can be connected in parallel. 15 8 SS Soft-Start Input. Connect a 10nF to 22nF capacitor from SS to SGND to set the soft-start and fault timer periods. SS sources 2µA to an external soft-start capacitor during start-up and when a fault is detected. As the voltage at SS increases to 1.2V, the voltage at COMP is clamped to 0.7V above the voltage at SS limiting the startup current. Under a fault condition, SS ramps at the same rate as in soft-start. When the voltage at SS reaches 1.2V, FAULT is asserted and the regulator is disabled. The external capacitor at SS is discharged to ground when not in use or when under voltage lockout or thermal shutdown occurs. 16 9 FB Regulation Feedback Input. Connect to external resistive voltage divider from the output voltage to FB to set output voltage.

Page 5

MP1527 2A, 1.3MHz Step-Up Converter MP1527 Rev 1.8_8/31/05 Monolithic Power Systems, Inc. 4 Monolithic Power Systems Typical Operating Characteristics (Circuit of Figure 9: Unless Otherwise Specified) Figure 2: MP1527 responding to FAULT being Figure 3: MP1527 responding to an overload driven low VOUT VSS VFAULT VOUT VSS VFAULT Figure 4: MP1527 starting from EN being Figure 5: Transient Load Response. Load driven low-to-high driven from 50mA to 500mA VOUT VSS IIN (500mA/Div) VEN VOUT

Page 6

MP1527 2A, 1.3MHz Step-Up Converter MP1527 Rev 1.8_8/31/05 Monolithic Power Systems, Inc. 5 Monolithic Power Systems Figure 6: Quiescent Current versus Input Voltage (Bootstrapped) 0 100 200 300 400 500 600 700 800 900 1000 0 5 10 15 20 25 Input Voltage (V) Q u ie sc en t C u rr en t (u A ) Figure 7: Efficiency vs. Load Current (Bootstrapped) VOUT=12V 50.00% 55.00% 60.00% 65.00% 70.00% 75.00% 80.00% 85.00% 90.00% 95.00% 100.00% 10 100 1000 Load Current (mA) E ff ic ie n cy VIN=3.3V VIN=5V VIN=8V

Page 7

MP1527 2A, 1.3MHz Step-Up Converter MP1527 Rev 1.8_8/31/05 Monolithic Power Systems, Inc. 6 Monolithic Power Systems Figure 8: Efficiency vs. Load Current (Non-Bootstrapped) VOUT = 12V 50.00% 55.00% 60.00% 65.00% 70.00% 75.00% 80.00% 85.00% 90.00% 95.00% 100.00% 10 100 1000 Load Current (mA) E ff ic ie n cy VIN=3.3V VIN=5V VIN=8V Figure 9: VIN = 5V, VOUT = 12V @ 500mA Load Figure 10: Driving Multiple Strings of White LEDs ON/OFF FAULT VIN = 5V VOUT = 12V @ 0.5A SS EN FAULT IN BP SGND SW FB PGND COMP 10µF C2 10µFMBR0530 R3 10K C3 5.6nF 10nF 10nF 4.7µH 10K 91K 100K C4 N/A ON/OFF Up to 6 LEDs per String MP1527 IN SS EN FB SW VIN = 2.6 to 25V 60 60 60 SGND PGND BP FAULTFAULT COMP 4.7µF 1µF1µF 10nF 10nF 5.6K 100K 4.7nF 1N5819HW

Page 8

MP1527 2A, 1.3MHz Step-Up Converter MP1527 Rev 1.8_8/31/05 Monolithic Power Systems, Inc. 7 Monolithic Power Systems Figure 11: Functional Block Diagram PWM CONTROL LOGIC FAULT SS SGND COMP FB 1.22V PGND GM SWVDD OSCILLATOR LDO EN BP 2.4V IN 2µA CURRENT SENSE AMP SOFT- START & FAULT CONTROL 1.098V

Page 9

MP1527 2A, 1.3MHz Step-Up Converter MP1527 Rev 1.8_8/31/05 Monolithic Power Systems, Inc. 8 Monolithic Power Systems Functional Description The MP1527 uses a 1.3MHz fixed-frequency, current-mode regulation architecture to regulate the output voltage. The MP1527 measures the output voltage through an external resistive voltage divider and compares that to the internal 1.22V reference to generate the error voltage at COMP. The current-mode regulator compares voltage at the COMP pin to the inductor current to regulate the output voltage. The use of current-mode regulation improves transient response and control loop stability. At the beginning of each cycle, the n-channel MOSFET switch is turned on, forcing the inductor current to rise. The current at the source of the switch is internally measured and converted to a voltage by the current sense amplifier. That voltage is compared to the error voltage at COMP. When the inductor current rises sufficiently, the PWM comparator turns off the switch forcing the inductor current to the output capacitor through the external rectifier. This forces the inductor current to decrease. The peak inductor current is controlled by the voltage at COMP, which in turn is controlled by the output voltage. Thus the output voltage controls the inductor current to satisfy the load. Internal Low-Dropout Regulator The internal power to the MP1527 is supplied from the input voltage (IN) through an internal 2.4V low-dropout linear regulator, whose output is BP. Bypass BP to SGND with a 10nF or greater capacitor to insure the MP1527 operates properly. The internal regulator can not supply any more current than is required to operate the MP1527, therefore do not apply any external load to BP. Soft-Start The MP1527 includes a soft-start timer that limits the voltage at COMP during start-up to prevent excessive current at the input. This prevents premature termination of the source voltage at startup due to input current overshoot at startup. When power is applied to the MP1527, or with power applied when enable is asserted, a 2µA internal current source charges the external capacitor at SS. As the capacitor charges, the voltage at SS rises. The MP1527 internally clamps the voltage at COMP to 0.7V above the voltage at SS. This limits the inductor current at start-up, forcing the input current to rise slowly to the current required to regulate the output voltage during soft-start. The soft-start period is determined by the equation: tSS = 2.75 *10 5 * CSS Where CSS (in F) is the soft-start capacitor from SS to SGND, and tSS (in seconds) is the soft- start period. Determine the capacitor required for a given soft-start period by the equation: CSS = 3.64 *10 -6 * tSS Use values for CSS between 10nF and 22nF to set the soft-start period. Fault Timer-Latch Function The MP1527 includes an output fault detector and timer-latch circuitry to disable the regulator in the event of an undervoltage, overcurrent, or thermal overload. Once the soft-start is complete, the fault comparator monitors the voltage at FB. If the voltage falls below the 1.098V fault threshold, the capacitor at SS charges through an internal 2µA current source. If the fault condition remains long enough for the capacitor at SS to charge to 1.2V, the FAULT output is pulled low and the power switch is turned off, disabling the output.

Page 10

MP1527 2A, 1.3MHz Step-Up Converter MP1527 Rev 1.8_8/31/05 Monolithic Power Systems, Inc. 9 Monolithic Power Systems The fault time-out period is determined by the equation: tFAULT = 6*10 5 * CSS If multiple MP1527 regulators are used in the same circuit, the FAULT input/outputs can be connected together. Should any one regulator indicate a fault, it pulls all FAULT input/outputs low, disabling all regulators. This insures that all outputs are disabled should any one output detect a fault. Pull-up FAULT to the input voltage (IN) through a 100KΩ resistor. The leakage current at FAULT is less than 250nA, so up to 20 FAULT input/outputs can be connected together through a single 100KΩ pull-up resistor. To reduce current draw when FAULT is active, a higher value pull-up resistor may be used. Calculate the pull-up resistor value by the equation: 100kΩ ≤ RPULL-UP ≤ 2MΩ / N Where N is the number of FAULT input/outputs connected together. Setting the Output Voltage Set the output voltage by selecting the resistive voltage divider ratio. The voltage divider drops the output voltage to the 1.22V feedback threshold voltage. Use 10KΩ for the low-side resistor of the voltage divider. Determine the high side resistor by the equation: RH = (VOUT - VFB) / (VFB / RL) where RH is the high-side resistor, RL is the low-side resistor, VOUT is the output voltage and VFB is the feedback regulation threshold. For RL = 10KΩ and VFB = 1.22V, then RH (KΩ) = 8.20* (VOUT – 1.22V) Selecting the Input Capacitor An input capacitor is required to supply the AC ripple current to the inductor, while limiting noise at the input source. A low ESR capacitor is required to keep the noise at the IC to a minimum. Ceramic capacitors are preferred, but tantalum or low-ESR electrolytic capacitors may also suffice. Use an input capacitor value greater than 4.7µF. The capacitor can be electrolytic, tantalum or ceramic. However since it absorbs the input switching current it requires an adequate ripple current rating. Use a capacitor with RMS current rating greater than the inductor ripple current (see Selecting The Inductor to determine the inductor ripple current). To insure stable operation place the input capacitor as close to the IC as possible. Alternately a smaller high quality ceramic 0.1µF capacitor may be placed closer to the IC with the larger capacitor placed further away. If using this technique, it is recommended that the larger capacitor be a tantalum or electrolytic type. All ceramic capacitors should be placed close to the MP1527. Selecting the Output Capacitor The output capacitor is required to maintain the DC output voltage. Low ESR capacitors are preferred to keep the output voltage ripple to a minimum. The characteristic of the output capacitor also affects the stability of the regulation control system. Ceramic, tantalum, or low ESR electrolytic capacitors are recommended. In the case of ceramic capacitors, the impedance of the capacitor at the switching frequency is dominated by the capacitance, and so the output voltage ripple is mostly independent of the ESR. The output voltage ripple is estimated to be: SW LOAD OUT IN RIPPLE f2C I V V - 1 V × ×⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ ≈ Where VRIPPLE is the output ripple voltage, VIN and VOUT are the DC input and output voltages respectively, ILOAD is the load current, fSW is the switching frequency, and C2 is the capacitance of the output capacitor. In the case of tantalum or low-ESR electrolytic capacitors, the ESR dominates the impedance

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