Step-Down Converter
The Future of Analog IC TechnologyTM MP2104 1.7MHz, 600mA Synchronous
TMDESCRIPTION
The MP2104 is a 1.7MHz constant frequency,
current mode, PWM step-down converter. The device integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. It is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. The MP2104 can supply 600mA of load current from a 2.5V to 6V input voltage. The output voltage for the MP2104DJ can be regulated as low as 0.6V, while the output voltages of the MP2104DJ-1.5 and MP2104DJ-1.8 are fixed at 1.5V and 1.8V, respectively. The MP2104 can also run at 100% duty cycle for low dropout applications.
The MP2104 is available in a low profile (1mm) 5-pin, TSOT package. ORDERING INFORMATION
Part Number Output Voltage MP2104DJ-1.5 VOUT = 1.5V MP2104DJ-1.8 VOUT = 1.8V MP2104DJ VOUT = 0.6V to 6V
FEATURES
• • • • • • • • • • • •
High Efficiency: Up to 95%
1.7MHz Constant Switching Frequency 600mA Available Load Current 2.5V to 6V Input Voltage Range Output Voltage as Low as 0.6V 100% Duty Cycle in Dropout Current Mode Control Short Circuit Protection Thermal Fault Protection <0.1µA Shutdown Current
1.5V and 1.8V Fixed Output Versions Space Saving 5-Pin TSOT23 Package
APPLICATIONS
• Cellular and Smart Phones
• Microprocessors and DSP Core Supplies • PDAs • MP3 Players
• Digital Still and Video Cameras • Portable Instruments
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc.
EVALUATION BOARD REFERENCE
Board Number EV2104DJ-00A
Dimensions 2.0”X x 2.0”Y x 0.5”Z
TYPICAL APPLICATION
Efficiency vsLoad Current100INPUT2.5V - 6V4INSW3MP2104DJ-1.8OFFON1ENGND2OUT5EFFICIENCY (%)OUTPUT1.8V600mA9080706050403020100VIN = 3.3VVIN = 4.2VMP2104_TAC_S01
10100LOAD CURRENT (mA)1000MP2104-EC01
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TMMP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
PACKAGE REFERENCE
TOP VIEWENGNDSW15FBENGND4INSW1
TOP VIEW5OUTMARKINGC2YWMP2104_PD01-TSOT23-523234INMP2104_PD02-TSOT23-5Part Number* Package Temperature Part Number**MP2104DJ-1.5MP2104DJ-1.8Package Marking Temp MP2104DJ TSOT23-5 –40°C to +85°C * For Tape & Reel, add suffix –Z (eg. MP2104DJ–Z)
For Lead Free, add suffix –LF (eg. MP2104DJ–LF–Z)
TSOT23-5 D7YW –40°C to TSOT23-5 D8YW +85°C **For Tape & Reel, add suffix –Z (eg. MP2104DJ-1.5–Z)
For Lead Free, add suffix –LF (eg. MP2104DJ-1.5–LF–Z)
ABSOLUTE MAXIMUM RATINGS (1)
VIN to GND..................................–0.3V to +6.5V VSW to GND...........................–0.3V to VIN +0.3V VFB, VEN to GND..........................–0.3V to +6.5V SW Peak Current........................................1.4A Junction Temperature.............................+150°C
(2)
Lead Temperature ..............................+260°C Storage Temperature .............–65°C to +150°C
Recommended Operating Conditions
Supply Voltage VIN.............................2.5V to 6V Output Voltage VOUT..........................0.6V to 6V Operating Temperature.............–40°C to +85°C
(3)
Thermal Resistance
(4)
θJA θJC
TSOT23-5..............................220....110..°C/W
Notes:
1) Exceeding these ratings may damage the device.
2) For recommended IR reflow temperature information, refer to
MPS document MP2104_IRRTP.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on approximately 1” square of 1 oz copper.
ELECTRICAL CHARACTERISTICS (5)
VIN = VEN = 3.6V, TA = +25°C, unless otherwise noted.
Parameter Symbol Condition Min Typ Max Units Supply Current VEN = VIN, VFB = 0.65V 400 600 µA Shutdown Current VEN = 0V, VIN = 6V 0.01 1 µA IN Under Voltage Lockout
Rising Edge 2.10 2.27 2.45 V
Threshold
IN Under Voltage Lockout
55 mV Hysteresis
TA = +25°C, MP2104DJ 0.588 0.600 0.612
Regulated FB Voltage V
–40°C ≤ TA ≤ +85°C 0.582 0.600 0.618
FB Input Bias Current VFB = 0.65V, MP2104DJ –50 0.5 +50 nA
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TMMP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS (continued) (5)
VIN = VEN = 3.6V, TA = +25°C, unless otherwise noted.
Parameter Symbol Condition
MP2104DJ-1.5
IOUT = 50mA
–40°C ≤ TA ≤ +85°C
Regulated Output Voltage
MP2104DJ-1.8 IOUT = 50mA
–40°C ≤ TA ≤ +85°C
PFET On Resistance ISW 100mA NFET On Resistance ISW –100mA
VEN = 0V, VIN = 6V
SW Leakage Current
VSW = 0V or 6V Duty Cycle = 100%,
PFET Current Limit
Current Pulse Width < 1ms
Oscillator Frequency Thermal Shutdown Trip
=Threshold
=EN Trip Threshold –40°C ≤ TA ≤ +85°C EN Input Current VEN = 0V to 6V
Min Typ Max Units 1.455 1.500 1.545 V
1.746 1.800 1.854 0.44 Ω
0.29 Ω –1 +1 µA 0.7 1.0 1.35 A 1.26
1.70
2.08
MHz
145 °C 0.3 0.96 1.5 V –1 +1 µA
Notes:
5) 100% production test at +25°C. Typical and temperature specifications are guaranteed by design and characterization.
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TMMP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.3V, VOUT = 1.8V, L1 = 10µH, C1 = 4.7µF, C3 = 10µF, TA = +25°C, unless otherwise noted.
Efficiency vsLoad Current1009080VIN = 3.3V1009080Efficiency vsLoad CurrentVIN = 3.3V1.851.83Output Voltage vsLoad CurrentOUTPUT VOLTAGE (V)1.811.791.771.751.731.711.691.67VIN = 3.3V0100200300400500600700800900EFFICIENCY (%)70605040302010010100LOAD CURRENT (mA)1000MP2104-TPC01EFFICIENCY (%)70605040302010010VIN = 4.2VVIN = 4.2V100LOAD CURRENT (mA)1000MP2104-TPC021.65LOAD CURRENT (mA)MP2104-TPC05Efficiency vsLoad Current10090801009080Efficiency vsLoad Current1.810Output Voltage vsSupply VoltageOUTPUT VOLTAGE (V)1.8081.8061.8041.802ILOAD = 200mA10001.8002345SUPPLY VOLTAGE (V)6EFFICIENCY (%)70605040302010010VOUT = 1.8VVIN = 3.3V100LOAD CURRENT (mA)1000EFFICIENCY (%)70605040302010010VOUT = 1.8VVIN = 4.2V100LOAD CURRENT (mA)MP2104-TPC03MP2104-TPC04MP2104-TPC06Regulated FB Voltage vsTemperature0.6201.3PFET Current Limit vsTemperatureOSCILLATOR FREQUENCY (MHz)2.051.951.851.751.651.551.451.35Oscillator Frequency vsSupply VoltageREGULATED FB VOLTAGE (V)PFET CURRENT LIMIT (A)0.6150.6100.6050.6000.5950.5900.5850.580-50-30-101030407090110130TEMPERATURE (°C)MP2104-TPC071.21.11.00.90.80.7-50-30-101030407090110130TEMPERATURE (°C)MP2104-TPC081.252.02.53.03.54.04.55.05.56.0SUPPLY VOLTAGE (V)MP2104-TPC09
MP2104 Rev. 1.3 10/4/2005
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TMMP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 1.8V, L1 = 10µH, C1 = 4.7µF, C3 = 10µF, TA = +25°C, unless otherwise noted.
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TMMP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin # Name Description
Regulator Enable Control Input. Drive EN above 1.5V to turn on the MP2104. Drive EN below
1 EN 0.3V to turn it off (shutdown current < 0.1µA).
2 GND Ground. 3 SW Power Switch Output. Inductor connection to drains of the internal PFET and NFET switches. 4 IN Supply Input. Bypass to GND with a 2.2µF or greater ceramic capacitor.
Feedback Input (MP2104DJ). Connect FB to the center point of the external resistor divider. The
5 FB feedback threshold voltage is 0.6V.
Output Voltage Sense Input (MP2104DJ-1.5 and MP2104DJ-1.8). An internal resistor divider is
5 OUT connected to this pin to set the proper output voltage.
OPERATION
The MP2104 is a constant frequency current mode PWM step-down converter. The MP2104 is optimized for low voltage, Li-Ion battery powered applications where high efficiency and small size are critical. The MP2104 uses an external resistor divider to set the output voltage from 0.6V to 6V. The device integrates both a main switch and a synchronous rectifier, which provides high efficiency and eliminates
IN+IAMP10X--CURRENTSENSEAMPPWMDHMAINSWITCH(PCH)PWMCONTROLLOGICSWSYNCHRONOUSRECTIFIER(NCH)DLan external Schottky diode. The MP2104 can achieve 100% duty cycle. The duty cycle D of a step-down converter is defined as:
D=TON×fOSC×100%≈
VOUT
×100% VIN
Where TON is the main switch on time, fOSC is the oscillator frequency (1.7MHz), VOUT is the output voltage and VIN is the input voltage.
ENBIAS&VOLTAGEREFERENCEICS+SLOPE COMPEAO0.6VFEEDBACKERROREAMPAMP--++PWMCMP--FBCC17pF1.7MHzOSCILLATOROSCGNDMP2104_BD01Figure 1—Functional Block Diagram (MP2104)
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TMMP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
IN+IAMP10X--CURRENTSENSEAMPPWMDHMAINSWITCH(PCH)PWMCONTROLLOGICSWSYNCHRONOUSRECTIFIER(NCH)DLENBIAS&VOLTAGEREFERENCEICS+SLOPE COMPEAO0.6VFEEDBACKERROREAMPAMP--++PWMCMP--OUTCC17pF1.7MHzOSCILLATOROSCGNDMP2104_BD01
Figure 2—Functional Block Diagram (MP2104DJ-1.5 / MP2104DJ-1.8)
Current Mode PWM Control
Slope compensated current mode PWM control provides stable switching and cycle-by-cycle current limit for superior load and line response and protection of the internal main switch and synchronous rectifier. The MP2104 switches at a constant frequency (1.7MHz) and regulates the output voltage. During each cycle the PWM comparator modulates the power transferred to the load by changing the inductor peak current based on the feedback error voltage. During normal operation, the main switch is turned on for a certain time to ramp the inductor current at each rising edge of the internal oscillator, and switched off when the peak inductor current is above the error voltage. When the main switch is off, the synchronous rectifier will be turned on immediately and stay on until either the next cycle starts. Dropout Operation
The MP2104 allows the main switch to remain on for more than one switching cycle and increases the duty cycle while the input voltage is dropping close to the output voltage. When the duty cycle reaches 100%, the main switch is held on continuously to deliver current to the output up to
MP2104 Rev. 1.3 10/4/2005
the PFET current limit. The output voltage then is the input voltage minus the voltage drop across the main switch and the inductor.
Short Circuit Protection
The MP2104 has short circuit protection. When the output is shorted to ground, the oscillator frequency is reduced to prevent the inductor current from increasing beyond the PFET current limit. The PFET current limit is also reduced to lower the short circuit current. The frequency and current limit will return to the normal values once the short circuit condition is removed and the feedback voltage reaches 0.6V.
Maximum Load current
The MP2104 can operate down to 2.5V input voltage, however the maximum load current decreases at lower input due to large IR drop on the main switch and synchronous rectifier. The slope compensation signal reduces the peak inductor current as a function of the duty cycle to prevent sub-harmonic oscillations at duty cycles greater than 50%. Conversely the current limit increases as the duty cycle decreases.
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TMMP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
APPLICATION INFORMATION
Output Voltage Setting (MP2104DJ)
The external resistor divider sets the output voltage (see Figure 3). The feedback resistor R1 also sets the feedback loop bandwidth with the internal compensation capacitor (see Figure 1). Choose R1 around 300kΩ for optimal transient response. R2 is then given by:
R2=
R1VOUT
−10.6V
Inductor Selection
A 1µH to 10µH inductor with DC current rating at least 25% higher than the maximum load current is recommended for most applications. For best efficiency, the inductor DC resistance shall be <200mΩ. See Table 2 for recommended inductors and manufacturers. For most designs, the inductance value can be derived from the following equation:
L=
VOUT×(VIN−VOUT) VIN×∆IL×fOSC
Table 1—Resistor Selection vs. Output
Voltage Setting
VOUT R1 1.2V 1.5V 1.8V 2.5V
300kΩ (1%) 300kΩ (1%) 300kΩ (1%) 300kΩ (1%)
R2 300kΩ (1%) 200kΩ (1%) 150kΩ (1%) 95.3kΩ (1%)
Where ∆IL is the inductor ripple current. Choose inductor ripple current approximately 30% of the maximum load current, 600mA.
The maximum inductor peak current is:
IL(MAX)=ILOAD+
∆IL
2
Under light load conditions below 100mA, larger inductance is recommended for improved efficiency. Table 3 lists inductors recommended for this purpose.
Table 2—Suggested Surface Mount Inductors
Manufacturer
Part Number
Inductance (µH)
Max DCR (Ω)
Saturation Current (A)
Dimensions LxWxH (mm3)
Coilcraft LP1704-222M Toko D312C Sumida CDRH3D16 Taiyo Yuden LBC2518 2.2 0.07 1.7 6.5x5.3x2 2.2 0.14 1.0 3.6x3.6x1 2.2 0.072 1.2 4x4x1.8 2.2 0.13 0.6 2.5x1.8x1.8 Table 3—Inductors for Improved Efficiency at 25mA, 50mA, under 100mA Load.
Manufacturer
Part Number
Inductance (µH)
10 10 10 10 10 Max DCR (Ω)
Saturation Current (A)
IRMS (A)
0.9 0.8 0.5 0.7 1.4 Coilcraft DO1605T-103MX Murata LQH4C100K04 Sumida CMD4D06-100 Sumida CR32-100 Sumida CR54-100 0.3 1.0 0.2 1.2 0.3 0.7 0.2 1.0 0.1 1.2
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TMMP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
Input Capacitor Selection
The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input capacitor impedance at the switching frequency shall be less than input source impedance to prevent high frequency switching current passing to the input. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and small temperature coefficients. For most applications, a 4.7µF capacitor is sufficient. Output Capacitor Selection
The output capacitor keeps output voltage ripple small and ensures regulation loop stable. The output capacitor impedance shall be low at the switching frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended. The output ripple ∆VOUT is approximately:
∆VOUT
⎞V×(VIN−VOUT)⎛1
⎟≤OUT×⎜ESR+⎟⎜VIN×fOSC×L8×f×C3OSC⎠⎝
PC Board Layout
The high current paths (GND, IN and SW)
should be placed very close to the device with short, direct and wide traces. Input capacitor C1 needs to be as close as possible to the IN and GND pins. The external feedback resistors shall be placed next to the FB pin. Keep the switching node SW short and away from the feedback network. Figure 3 illustrates an example of PCB layout and signal routing.
Figure 3—MP2104 Suggested Layout For the fixed output versions (MP2104DJ-1.5 and MP2104-1.8), R1 is shorted and R2 is open.
Efficiency vsLoad Current100EFFICIENCY (%)INPUT2.5V - 6V4INSW3OUTPUT1.8V600mA9080706050403020100VIN = 3.3VVIN = 4.2VMP2104OFFON1ENGND2FB5MP2104_F04
10100LOAD CURRENT (mA)1000MP2104-EC02
Figure 4—VIN = 2.5V to 6V, VOUT = 1.8V, ILOAD = 600mA Step-Down Circuit
(L = 10µH for Higher Light-Load Efficiency)
NOTICE: MPS believes the information in this document to be accurate and reliable. However, it is subject to change without notice. Contact MPS for current specifications. MPS encourages users of its products to ensure that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS cannot assume any legal responsibility for any said applications. MP2104 Rev. 1.0 10/4/05
© 2004 MPS, Inc.
Monolithic Power Systems, Inc.
983 University Avenue, Building A, Los Gatos, CA 95032 USA
Tel: 408-357-6600 ♦ Fax: 408-357-6601 ♦ www.MonolithicPower.com
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TMMP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
PACKAGE INFORMATION
TSOT23-5
2.90 BSC
30.950TYP.0.950TYP.
10°TYP.(2 plcs)
3CL
1.60 BSC2.80 BSC0°
0.25 BSC.+4°
-0°
0.400±0.10
0.300(Min)0.500(Max)
(5PLCS)
Gauge Plane
CL
0.87±0.031.00Max.SEATING PLANE
0.00-0.100.127 TYP.10° TYP.(2 plcs)
NOTICE: The information in this document is subject to change without 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.
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