MCP1603LT-120I/OS

MCP1603/B/L 2.0 MHz, 500 mA Synchronous Buck Regulator Features General Description • Over 90% Typical Efficiency • Output Current Up To 500 mA • Low PFM Quiescent Current = 45 µA, typical (MCP1603/L) • Low Shutdown Current = 0.1 µA, typical • Adjustable Output Voltage: - 0.8V to 4.5V • Fixed Output Voltage: - 1.2V, 1.5V, 1.8V, 2.5V, 3.3V (MCP1603/L) - 1.8V, 3.3V (MCP1603B) • 2.0 MHz Fixed-Frequency PWM (Heavy Load) • Automatic PWM-to-PFM Mode Transition (MCP1603/L) • PWM Mode Only Option (MCP1603B) • 100% Duty Cycle Operation • Internally Compensated • Undervoltage Lockout (UVLO) • Overtemperature Protection • Space Saving Packages: - 5-Lead TSOT, Two Pinout Types (MCP1603/L) - 8-Lead 2 x 3 DFN The MCP1603/B/L is a high-efficiency, fully-integrated 500 mA synchronous buck regulator whose 2.7V to 5.5V input voltage range makes it ideally suited for applications powered from 1-cell Li-Ion or 2-cell/3-cell NiMH/NiCd batteries. Applications • • • • • • • • Cellular Telephones Portable Computers Organizers / PDAs USB Powered Devices Digital Cameras Portable Equipment +5V or +3.3V Distributed Systems Headsets  2007-2012 Microchip Technology Inc. At heavy loads, the MCP1603/B/L operates in the 2.0 MHz fixed frequency pulse-width modulation (PWM) mode, which provides a low noise, low-output ripple, small-size solution. When the load is reduced to light levels, the MCP1603/L automatically changes operation to a Pulse Frequency Modulation (PFM) mode to minimize quiescent current draw from the battery. No intervention is necessary for a smooth transition from one mode to another. These two modes of operation allow the MCP1603/L to achieve the highest efficiency over the entire operating current range. The MCP1603B device disables the PFM mode switching, and operates only in normal PWM mode over the entire load range (without skipping). MCP1603B is for applications that cannot tolerate the low-frequency output ripple associated with PFM switching. The MCP1603/B/L family is available with either an adjustable or fixed-output voltage. The available fixed output voltage options for MCP1603/L are 1.2V, 1.5V, 1.8V, 2.5V and 3.3V, and for MCP1603B are 1.8 and 3.3V. When a fixed option is used, only three additional small external components are needed to form a complete solution. Couple this with the low profile, small-foot print packages and the entire system solution is achieved with minimal size. Additional protection features include: overtemperature and overcurrent protection. UVLO, DS22042B-page 1 MCP1603/B/L Package Types MCP1603L TSOT MCP1603/MCP1603B TSOT VIN 1 GND 2 SHDN 3 5 LX SHDN 1 GND 2 LX 3 MCP1603 2 x 3 DFN* 5 LX 1 VFB/VOUT NC 2 4 VFB/VOUT 4 SHDN 3 VFB/VOUT 4 VIN 8 GND EP 9 7 VIN 6 NC 5 NC * Includes Exposed Thermal Pad (EP); see Table 3-1. Typical Application Circuit L1 4.7 µH VIN 2.7V to 4.5V VIN CIN 4.7 µF VOUT 1.8V @ 500 mA LX COUT 4.7 µF SHDN VFB GND 100 Efficiency (%) 90 VIN = 2.7V VOUT = 1.8V 80 70 60 50 40 VIN = 3.6V 30 VIN = 4.5V __ PFM/PWM (MCP1603/L) --- PWM (MCP1603B) 20 10 0.1 1 10 100 1000 Output Current (mA) DS22042B-page 2  2007-2012 Microchip Technology Inc. MCP1603/B/L Functional Block Diagram VIN Band Gap UVLO Thermal Shutdown UVLO VREF Soft Start SHDN ILIMPWM TSD IPK Limit IPEAKPWM ILIMPFM IPEAKPFM Slope Comp. + OSC -ILPK + S R Q POFF Q Switch Drive Logic and Timing NOFF LX PWM/PFM - PWM ONLY PWM-ONLY PFM Error Amp PWM/PFM Logic GND IPEAKPFM IPEAKPWM VREF PWM Error Amp -ILPK EA -IPK Limit VREF OV Threshold Disable Switcher VFB / VOUT UVLO TSD UV Threshold  2007-2012 Microchip Technology Inc. DS22042B-page 3 MCP1603/B/L NOTES: DS22042B-page 4  2007-2012 Microchip Technology Inc. MCP1603/B/L 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † VIN - GND.......................................................................+6.0V All Other I/O ............................... (GND - 0.3V) to (VIN + 0.3V) LX to GND .............................................. -0.3V to (VIN + 0.3V) Output Short Circuit Current ................................. Continuous Power Dissipation (Note 5) .......................... Internally Limited Storage Temperature ....................................-65°C to +150°C Ambient Temp. with Power Applied ................-40°C to +85°C Operating Junction Temperature...................-40°C to +125°C ESD Protection On All Pins: HBM ............................................................................. 4 kV MM ..............................................................................300V † Notice: Stresses above those listed under "Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability. DC CHARACTERISTICS Electrical Characteristics: Unless otherwise indicated, MCP1603/L, VIN = SHDN = 3.6V, COUT = CIN = 4.7 µF, L = 4.7 µH, VOUT(ADJ) = 1.8V, IOUT = 100 mA, TA = +25°C. Boldface specifications apply over the TA range of -40°C to +85°C. Parameters Sym Min Typ Max Units Conditions VIN 2.7 — 5.5 V Note 1 IOUT 500 — — mA Note 1 IIN_SHDN — 0.1 1 µA SHDN = GND Quiescent Current - PFM IQ — 45 60 µA SHDN = VIN, IOUT = 0 mA, device switching Quiescent Current - PWM IQ 1.0 2.7 4 mA SHDN = VIN, IOUT = 0 mA, device switching (MCP1603B) — 15 %VIN VIN = 2.7V to 5.5V %VIN VIN = 2.7V to 5.5V Input Characteristics Input Voltage Maximum Output Current Shutdown Current Shutdown/UVLO/Thermal Shutdown Characteristics SHDN, Logic Input Voltage Low SHDN, Logic Input Voltage High SHDN, Input Leakage Current Undervoltage Lockout Undervoltage Lockout Hysteresis Thermal Shutdown Thermal Shutdown Hysteresis Note 1: 2: 3: 4: 5: 6: VIL — VIH 45 — — IL_SHDN -1.0 ±0.1 1.0 µA VIN = 2.7V to 5.5V UVLO 2.12 2.28 2.43 V VIN Falling UVLOHYS — 140 — mV TSHD — 150 — °C Note 4, Note 5 TSHD-HYS — 10 — °C Note 4, Note 5 The input voltage should be greater then the output voltage plus headroom voltage; higher load currents increase the input voltage required for regulation. MCP1603B device requires a minimum load for regulation. See Section 2.0, Typical Performance Curves for typical operating voltage ranges. Reference Feedback Voltage Tolerance applies to adjustable output voltage setting. VR is the output voltage setting. The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable temperature and the thermal resistance from junction to air (i.e. TA, TJ, JA). Exceeding the maximum allowable power dissipation causes the device to initiate thermal shutdown. The internal MOSFET switches have an integral diode from the LX pin to the VIN pin, and from the LX pin to the GND pin. In cases where these diodes are forward-biased, the package power dissipation limits must be adhered to. Thermal protection is not able to limit the junction temperature for these cases. The current limit threshold is a cycle-by-cycle peak current limit.  2007-2012 Microchip Technology Inc. DS22042B-page 5 MCP1603/B/L DC CHARACTERISTICS (CONTINUED) Electrical Characteristics: Unless otherwise indicated, MCP1603/L, VIN = SHDN = 3.6V, COUT = CIN = 4.7 µF, L = 4.7 µH, VOUT(ADJ) = 1.8V, IOUT = 100 mA, TA = +25°C. Boldface specifications apply over the TA range of -40°C to +85°C. Parameters Sym Min Typ Max Units Conditions VOUT 0.8 — 4.5 V — 0.8 — V -3.0 — +3.0 % TA = -40°C to +25°C TA = +25°C to +85°C Output Characteristics Adjustable Output Voltage Range Reference Feedback Voltage VFB Reference Feedback Voltage Tolerance Note 2 -2.5 — +2.5 % Feedback Input Bias Current IVFB — 0.1 — nA Output Voltage Tolerance Fixed VOUT -3.0% VR +3.0% % TA = -40°C to +25°C, Note 3 VOUT -2.5 VR +2.5 % TA = +25°C to +85°C, Note 3 Line Regulation VLINE-REG — 0.3 — %/V Load Regulation VLOAD-REG — 0.35 — % FOSC 1.5 2.0 2.8 MHz Internal Oscillator Frequency VIN = VR + 1V to 5.5V, IOUT = 100 mA VIN = VR +1.5V, ILOAD = 100 mA to 500 mA TSS — 0.6 — ms TR = 10% to 90% RDSon P-Channel RDSon-P — 500 — m IP = 100 mA RDSon N-Channel RDSon-N — 500 — m IN = 100 mA ILX -1.0 ±0.1 1.0 µA SHDN = 0V, VIN = 5.5V, LX = 0V, LX = 5.5V +ILX(MAX) — 860 — mA Note 6 Start Up Time LX Pin Leakage Current Positive Current Limit Threshold Note 1: 2: 3: 4: 5: 6: The input voltage should be greater then the output voltage plus headroom voltage; higher load currents increase the input voltage required for regulation. MCP1603B device requires a minimum load for regulation. See Section 2.0, Typical Performance Curves for typical operating voltage ranges. Reference Feedback Voltage Tolerance applies to adjustable output voltage setting. VR is the output voltage setting. The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable temperature and the thermal resistance from junction to air (i.e. TA, TJ, JA). Exceeding the maximum allowable power dissipation causes the device to initiate thermal shutdown. The internal MOSFET switches have an integral diode from the LX pin to the VIN pin, and from the LX pin to the GND pin. In cases where these diodes are forward-biased, the package power dissipation limits must be adhered to. Thermal protection is not able to limit the junction temperature for these cases. The current limit threshold is a cycle-by-cycle peak current limit. TEMPERATURE SPECIFICATIONS Electrical Specifications: Unless otherwise indicated, all limits are specified for: VIN + 2.7V to 5.5V Parameters Sym Min Typ Max Units Conditions Operating Junction Temperature Range TJ -40 — +125 °C Storage Temperature Range TA -65 — +150 °C Maximum Junction Temperature TJ — — +150 °C Thermal Resistance, 5L-TSOT JA — 207.4 — °C/W Typical 4-layer Board with Internal Ground Plane Thermal Resistance, 8L-2x3 DFN JA — 68 — °C/W Typical 4-layer Board with Internal Ground Plane and 2-Vias in Thermal Pad Temperature Ranges Steady State Transient Package Thermal Resistances DS22042B-page 6  2007-2012 Microchip Technology Inc. MCP1603/B/L 2.0 TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. 50 49 48 47 46 45 44 43 42 41 40 52 VOUT = 1.8V VIN = 3.6V VIN = 4.2V VIN = 3.0V 3 0V Quiiescent Current (µA) Quie escent Current (µA) Note: Unless otherwise indicated, MCP1603/L, VIN = SHDN = 3.6V, COUT = CIN = 4.7 µF, L = 4.7 µH, VOUT(ADJ) = 1.8V, ILOAD = 100 mA, TA = +25°C. Adjustable or fixed output voltage options can be used to generate the Typical Performance Characteristics. 48 46 5 44 42 TA = -40oC 2.7 20 35 50 65 80 95 110 125 Ambient Temperature 3.4 Quies scent Current (mA) VIN = 3.0V 3.1 3 VIN = 4.2V 2.8 2.7 3.75 4.1 4.45 4.8 5.15 5.5 Input Voltage (V) VOUT = 1.8V 2.9 3.4 FIGURE 2-4: (MCP1603/L). 3.3 3.2 3.05 (oC) FIGURE 2-1: PFM IQ vs. Ambient Temperature (MCP1603/L). Quies scent Current (mA) TA = +25oC 40 -40 -25 -10 VIN = 3.6V 2.6 2.5 PFM IQ vs. Input Voltage VOUT = 1.8V TA = +90oC 3.2 TA = +25oC 3 2.8 2.6 2.4 TA = -40oC 2.2 2 2.4 -40 -25 -10 5 20 35 50 65 Ambient Temperature (oC) 2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5 80 Input Voltage (V) FIGURE 2-2: PWM IQ vs. Ambient Temperature (MCP1603B). PWM IQ vs. Input Voltage FIGURE 2-5: (MCP1603B). 100 100 90 VOUT = 1.2V 95 80 IOUT = 100 mA 90 85 80 IOUT = 300 mA 75 IOUT = 500 mA 70 Efficiency (%) E Efficiency (%) TA = +90oC 50 70 60 50 40 65 60 10 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5 Input Voltage (V) FIGURE 2-3: (VOUT = 1.2V). Efficiency vs. Input Voltage  2007-2012 Microchip Technology Inc. VOUT = 1.2V 30 20 2.7 VIN = 3.6V VIN = 2.7V VIN = 4.2V PFM/PWM PWM Only 0 0.1 FIGURE 2-6: (VOUT = 1.2V). 1 10 100 Output Current (mA) 1000 Efficiency vs. Output Load DS22042B-page 7 MCP1603/B/L Note: Unless otherwise indicated, MCP1603/L, VIN = SHDN = 3.6V, COUT = CIN = 4.7 µF, L = 4.7 µH, VOUT(ADJ) = 1.8V, ILOAD = 100 mA, TA = +25°C. Adjustable or fixed output voltage options can be used to generate the Typical Performance Characteristics. 0.6 100 Efficiency (%) 95 IOUT = 100 mA 90 85 IOUT = 300 mA IOUT = 500 mA 80 75 VOUT = 1.8V Lin ne Regualtion (%/V) VOUT = 1.8V 0.5 IOUT = 300 mA 0.4 0.3 IOUT = 100 mA 0.2 02 0.1 70 2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 -40 -25 -10 5.5 Efficiency vs. Input Voltage FIGURE 2-10: Line Regulation vs. Ambient Temperature (VOUT = 1.8V). 100 Output O Voltage (V) 70 60 50 VIN = 4.2V 40 30 VOUT = 1.8V 1 8V 20 PFM/PWM PWM Only 10 TA = +90oC 1.80 1.79 1.78 TA = +25oC TA = -40oC 1.77 1.76 1.75 1.74 0 1 FIGURE 2-8: (VOUT = 1.8V). 10 100 Output Current (mA) VOUT = 2.4V IOUT = 100 mA 95 90 IOUT = 300 mA IOUT = 500 mA 85 80 75 3 3.5 4 4.5 5 5.5 Input Voltage (V) FIGURE 2-9: (VOUT = 2.4V). DS22042B-page 8 150 200 250 300 350 400 450 500 Output Current (mA) Efficiency vs. Output Load 100 100 1000 Efficiency vs. Input Voltage FIGURE 2-11: Output Voltage vs. Load Current (VOUT = 1.8V). 100 90 80 70 60 50 40 30 20 10 0 VIN = 2.7V VIN = 3.6V Efficiency (%) E 0.1 Efficiency (%) TA = +125oC 1.81 VIN = 3.6V 80 Efficiency (%) E 1.82 VIN = 2.7V 90 20 35 50 65 80 95 110 125 Ambient Temperature (oC) Input Voltage (V) FIGURE 2-7: (VOUT = 1.8V). 5 VIN = 4.2V VOUT = 2.4V 2 4V PFM/PWM PWM Only 0.1 1 10 100 Output Current (mA) 1000 FIGURE 2-12: PFM/PWM Efficiency vs. Output Load (VOUT = 2.4V).  2007-2012 Microchip Technology Inc. MCP1603/B/L 100.0 VOUT = 3.3V 97.5 Efficiency (%) IOUT = 100 mA IOUT = 300 mA 95.0 92.5 90.0 IOUT = 500 mA 87.5 85.0 3.5 3.75 4 4.25 4.5 4.75 5 Switch hing Frequency (MHz) Note: Unless otherwise indicated, MCP1603/L, VIN = SHDN = 3.6V, COUT = CIN = 4.7 µF, L = 4.7 µH, VOUT(ADJ) = 1.8V, ILOAD = 100 mA, TA = +25°C. Adjustable or fixed output voltage options can be used to generate the Typical Performance Characteristics. 2.20 2.15 2.10 2.05 2.00 1.95 5.25 5.5 -40 -25 -10 5 20 35 50 65 80 95 110 125 Ambient Temperature (oC) Input Voltage (V) FIGURE 2-13: (VOUT = 3.3V). Efficiency vs. Input Voltage FIGURE 2-16: Switching Frequency vs. Ambient Temperature. 90 VIN = 3.6V 80 Efficiency (%) E 70 60 50 VIN = 4.2V 40 30 VOUT = 3.3V 20 PFM/PWM PWM Only 10 Switch hing Frequency (MHz) 100 2.20 2.15 2.10 2.05 2 00 2.00 1.95 2.7 0 0.1 1 FIGURE 2-14: (VOUT = 3.3V). 10 100 Output Current (mA) 3.4 Efficiency vs. Output Load 3.75 4.1 4.45 4.8 5.15 5.5 Input Voltage (V) FIGURE 2-17: Input Voltage. 10 Switching Frequency vs. 0.65 8 Regulation 7 6 TA= +25oC 5 4 TA= -40oC TA= +85oC 3 2 No Regulation 1 Swittch Resistance () 9 Lo oad Current (mA) 3.05 1000 0.60 0.55 0.50 N-Channel P-Channel 0.45 0.40 0.35 0 2.7 1.8 2 2.2 2.4 2.6 2.8 3 VIN - VOUT (V) 3.2 FIGURE 2-15: PWM-Only Device Minimum Load for Regulation (MCP1603B).  2007-2012 Microchip Technology Inc. 3.05 3.4 3.6 3.4 3.75 4.1 4.45 4.8 5.15 5.5 Input Voltage (V) FIGURE 2-18: Voltage. Switch Resistance vs. Input DS22042B-page 9 MCP1603/B/L Note: Unless otherwise indicated, MCP1603/L, VIN = SHDN = 3.6V, COUT = CIN = 4.7 µF, L = 4.7 µH, VOUT(ADJ) = 1.8V, ILOAD = 100 mA, TA = +25°C. Adjustable or fixed output voltage options can be used to generate the Typical Performance Characteristics. Swittch Resistance () 0.9 0.8 N-Channel 0.7 0.6 0.5 0.4 P-Channel 0.3 -40 -25 -10 5 20 35 50 65 80 95 110 125 Ambient Temperature (oC) FIGURE 2-19: Switch Resistance vs. Ambient Temperature. FIGURE 2-22: PFM Light Load Switching Waveforms (MCP1603/L). FIGURE 2-20: Waveform. Output Voltage Startup FIGURE 2-23: Output Voltage Load Step Response vs. Time. FIGURE 2-21: Waveform. Heavy Load Switching FIGURE 2-24: Output Voltage Line Step Response vs. Time. DS22042B-page 10  2007-2012 Microchip Technology Inc. MCP1603/B/L Note: Unless otherwise indicated, MCP1603/L, VIN = SHDN = 3.6V, COUT = CIN = 4.7 µF, L = 4.7 µH, VOUT(ADJ) = 1.8V, ILOAD = 100 mA, TA = +25°C. Adjustable or fixed output voltage options can be used to generate the Typical Performance Characteristics. VLx = 2 V/div VOUT = 50 mV/div, AC IOUT = 5 mA IL = 20 mA/div 0.4 µs/div FIGURE 2-25: PWM Light Load Switching Waveforms (MCP1603B).  2007-2012 Microchip Technology Inc. DS22042B-page 11 MCP1603/B/L NOTES: DS22042B-page 12  2007-2012 Microchip Technology Inc. MCP1603/B/L 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE MCP1603/B TSOT-23 MCP1603L TSOT-23 MCP1603 2 x 3 DFN 1 4 7 VIN 2 2 8 GND 3 1 3 SHDN 4 5 4 VFB/VOUT 5 3 1 LX Switch Node, Buck Inductor Connection Pin 3.1 Symbol Shutdown Control Input Pin Feedback / Output Voltage Pin — 2, 5, 6 NC No Connect — — Exposed Pad EP For the DFN package, the center exposed pad is a thermal path to remove heat from the device. Electrically, this pad is at ground potential and should be connected to GND. Power Supply Input Voltage Pin (VIN) Ground Pin (GND) Ground pin for the device. The loop area of the ground traces should be kept as minimal as possible. 3.3 Power Supply Input Voltage Pin Ground Pin — Connect the input voltage source to VIN. The input source must be decoupled to GND with a 4.7 µF capacitor. 3.2 Description Shutdown Control Input Pin (SHDN) The SHDN pin is a logic-level input used to enable or disable the device. A logic high (>45% of VIN) will enable the regulator output. A logic low (