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TM
MP2104
1.7MHz, 600mA Synchronous Step-Down Converter
The Future of Analog IC Technology
TM
DESCRIPTION
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 MP2104DJ-1.5 MP2104DJ-1.8 MP2104DJ Board Number EV2104DJ-00A Output Voltage VOUT = 1.5V VOUT = 1.8V VOUT = 0.6V to 6V Dimensions 2.0"X x 2.0"Y x 0.5"Z
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 <0.1A Shutdown Current 1.5V and 1.8V Fixed Output Versions Space Saving 5-Pin TSOT23 Package Cellular and Smart Phones Microprocessors and DSP Core Supplies PDAs MP3 Players Digital Still and Video Cameras Portable Instruments
APPLICATIONS
EVALUATION BOARD REFERENCE
"MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Efficiency vs Load Current
100
INPUT 2.5V - 6V
4 IN SW 3
MP2104DJ-1.8
OFF ON
1 EN GND 2 OUT 5
EFFICIENCY (%)
OUTPUT 1.8V 600mA
90 80 70 60 50 40 30 20 10 0
VIN = 3.3V VIN = 4.2V
MP2104_TAC_S01
10
100 LOAD CURRENT (mA)
1000
MP2104-EC01
MP2104 Rev. 1.3 10/4/2005
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TM
MP2104 - 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
PACKAGE REFERENCE
TOP VIEW
EN GND SW 1 5 FB EN GND 4 IN SW 1
TOP VIEW
5 OUT
MARKING
C2YW
MP2104_PD01-TSOT23-5
2 3
2 3
4
IN
MP2104_PD02-TSOT23-5
Part Number* MP2104DJ *
Package TSOT23-5
Temperature -40C to +85C
Part Number** MP2104DJ-1.5 MP2104DJ-1.8
Package TSOT23-5 TSOT23-5
Marking D7YW D8YW
Temp -40C to +85C
For Tape & Reel, add suffix -Z (eg. MP2104DJ-Z) For Lead Free, add suffix -LF (eg. MP2104DJ-LF-Z)
** 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 .............................+150C (2) Lead Temperature ..............................+260C Storage Temperature ............. -65C to +150C
Recommended Operating Conditions
(3)
Supply Voltage VIN ............................. 2.5V to 6V Output Voltage VOUT .......................... 0.6V to 6V Operating Temperature .............-40C to +85C
Thermal Resistance
(4)
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.
JA
JC
ELECTRICAL CHARACTERISTICS (5)
VIN = VEN = 3.6V, TA = +25C, unless otherwise noted.
Parameter Supply Current Shutdown Current IN Under Voltage Lockout Threshold IN Under Voltage Lockout Hysteresis Regulated FB Voltage FB Input Bias Current Symbol Condition VEN = VIN, VFB = 0.65V VEN = 0V, VIN = 6V Rising Edge Min Typ 400 0.01 2.27 55 TA = +25C, MP2104DJ -40C TA +85C VFB = 0.65V, MP2104DJ 0.588 0.582 -50 0.600 0.600 0.5 0.612 0.618 +50 Max 600 1 2.45 Units A A V mV V nA
2.10
MP2104 Rev. 1.3 10/4/2005
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TM
MP2104 - 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS (continued) (5)
VIN = VEN = 3.6V, TA = +25C, unless otherwise noted.
Parameter Symbol Condition MP2104DJ-1.5 IOUT = 50mA -40C TA +85C MP2104DJ-1.8 IOUT = 50mA -40C TA +85C ISW = 100mA ISW = -100mA VEN = 0V, VIN = 6V VSW = 0V or 6V Duty Cycle = 100%, Current Pulse Width < 1ms Min 1.455 Typ 1.500 Max 1.545 V 1.746 1.800 0.44 0.29 -1 0.7 1.26 1.0 1.70 145 -40C TA +85C VEN = 0V to 6V 0.3 -1 0.96 1.5 +1 +1 1.35 2.08 1.854 A A MHz C V A Units
Regulated Output Voltage
PFET On Resistance NFET On Resistance SW Leakage Current PFET Current Limit Oscillator Frequency Thermal Shutdown Trip Threshold EN Trip Threshold EN Input Current
Notes: 5) 100% production test at +25C. Typical and temperature specifications are guaranteed by design and characterization.
MP2104 Rev. 1.3 10/4/2005
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TM
MP2104 - 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.3V, VOUT = 1.8V, L1 = 10H, C1 = 4.7F, C3 = 10F, TA = +25C, unless otherwise noted.
Efficiency vs Load Current
100 90 80 VIN = 3.3V 100 90 80
Efficiency vs Load Current
VIN = 3.3V VIN = 4.2V 1.85 1.83
Output Voltage vs Load Current
OUTPUT VOLTAGE (V)
1.81 1.79 1.77 1.75 1.73 1.71 1.69 1.67 VIN = 3.3V
0 100 200 300 400 500 600 700 800 900
EFFICIENCY (%)
70 60 50 40 30 20 10 0 10 100 LOAD CURRENT (mA) 1000
MP2104-TPC01
EFFICIENCY (%)
70 60 50 40 30 20 10 0 10
VIN = 4.2V
100 LOAD CURRENT (mA)
1000
MP2104-TPC02
1.65
LOAD CURRENT (mA)
MP2104-TPC05
Efficiency vs Load Current
100 90 80 100 90 70 60 50 40 30 20 10 1000 0 80
Efficiency vs Load Current
1.810
Output Voltage vs Supply Voltage
OUTPUT VOLTAGE (V)
1.808 1.806 1.804 1.802 ILOAD = 200mA 1000 1.800 2 3 4 5 SUPPLY VOLTAGE (V) 6
EFFICIENCY (%)
70 60 50 40 30 20 10 0 10 VOUT = 1.8V VIN = 3.3V 100 LOAD CURRENT (mA)
EFFICIENCY (%)
VOUT = 1.8V VIN = 4.2V 10 100 LOAD CURRENT (mA)
MP2104-TPC03
MP2104-TPC04
MP2104-TPC06
Regulated FB Voltage vs Temperature
0.620 1.3
PFET Current Limit vs Temperature
OSCILLATOR FREQUENCY (MHz)
2.05 1.95 1.85 1.75 1.65 1.55 1.45 1.35
Oscillator Frequency vs Supply Voltage
REGULATED FB VOLTAGE (V)
PFET CURRENT LIMIT (A)
0.615 0.610 0.605 0.600 0.595 0.590 0.585 0.580 -50 -30 -10 10 30 40 70 90 110 130 TEMPERATURE (C)
MP2104-TPC07
1.2 1.1 1.0 0.9 0.8 0.7 -50 -30 -10 10 30 40 70 90 110 130 TEMPERATURE (C)
MP2104-TPC08
1.25 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE (V)
MP2104-TPC09
MP2104 Rev. 1.3 10/4/2005
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TM
MP2104 - 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 1.8V, L1 = 10H, C1 = 4.7F, C3 = 10F, TA = +25C, unless otherwise noted.
MP2104 Rev. 1.3 10/4/2005
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MP2104 - 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin # Name Description 1 2 3 4 5 5 Regulator Enable Control Input. Drive EN above 1.5V to turn on the MP2104. Drive EN below 0.3V to turn it off (shutdown current < 0.1A). GND Ground. SW Power Switch Output. Inductor connection to drains of the internal PFET and NFET switches. IN Supply Input. Bypass to GND with a 2.2F or greater ceramic capacitor. Feedback Input (MP2104DJ). Connect FB to the center point of the external resistor divider. The FB feedback threshold voltage is 0.6V. Output Voltage Sense Input (MP2104DJ-1.5 and MP2104DJ-1.8). An internal resistor divider is OUT connected to this pin to set the proper output voltage. EN
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 + IAMP 10X -CURRENT SENSE AMP PWM DH MAIN SWITCH (PCH) PWM CONTROL LOGIC SW SYNCHRONOUS RECTIFIER (NCH) DL
an external Schottky diode. The MP2104 can achieve 100% duty cycle. The duty cycle D of a step-down converter is defined as:
D = TON x fOSC x 100% VOUT x 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.
EN
BIAS & VOLTAGE REFERENCE ICS + SLOPE COMP EAO
0.6V FEEDBACK ERROR EAMP AMP --
+ + PWMCMP --
FB
CC 17pF
1.7MHz OSCILLATOR
OSC
GND
MP2104_BD01
Figure 1--Functional Block Diagram (MP2104)
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MP2104 - 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
IN + IAMP 10X -CURRENT SENSE AMP PWM DH MAIN SWITCH (PCH) PWM CONTROL LOGIC SW SYNCHRONOUS RECTIFIER (NCH) DL
EN
BIAS & VOLTAGE REFERENCE ICS + SLOPE COMP EAO
0.6V FEEDBACK ERROR EAMP AMP --
+ + PWMCMP --
OUT
CC 17pF
1.7MHz OSCILLATOR
OSC
GND
MP2104_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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MP2104 - 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 300k for optimal transient response. R2 is then given by:
R2 = R1 VOUT -1 0 .6 V
Inductor Selection A 1H to 10H 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 <200m. See Table 2 for recommended inductors and manufacturers. For most designs, the inductance value can be derived from the following equation:
L= VOUT x (VIN - VOUT ) VIN x IL x fOSC
Table 1--Resistor Selection vs. Output Voltage Setting
VOUT 1.2V 1.5V 1.8V 2.5V R1 300k (1%) 300k (1%) 300k (1%) 300k (1%) R2 300k (1%) 200k (1%) 150k (1%) 95.3k (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
Coilcraft Toko Sumida Taiyo Yuden
Part Number
LP1704-222M D312C CDRH3D16 LBC2518
Inductance (H)
2.2 2.2 2.2 2.2
Max DCR ()
0.07 0.14 0.072 0.13
Saturation Current (A)
1.7 1.0 1.2 0.6
Dimensions LxWxH (mm3)
6.5x5.3x2 3.6x3.6x1 4x4x1.8 2.5x1.8x1.8
Table 3--Inductors for Improved Efficiency at 25mA, 50mA, under 100mA Load.
Manufacturer
Coilcraft Murata Sumida Sumida Sumida
Part Number
DO1605T-103MX LQH4C100K04 CMD4D06-100 CR32-100 CR54-100
Inductance (H)
10 10 10 10 10
Max DCR ()
0.3 0.2 0.3 0.2 0.1
Saturation Current (A)
1.0 1.2 0.7 1.0 1.2
IRMS (A)
0.9 0.8 0.5 0.7 1.4
MP2104 Rev. 1.3 10/4/2005
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TM
MP2104 - 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 4.7F 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 VOUT x (VIN - VOUT ) 1 x ESR + VIN x fOSC x L 8 x fOSC x C3
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 vs Load Current
100
EFFICIENCY (%)
INPUT 2.5V - 6V
4
IN
SW
3
MP2104
OFF ON
1 EN GND 2 FB 5
OUTPUT 1.8V 600mA
90 80 70 60 50 40 30 20 10
VIN = 3.3V VIN = 4.2V
MP2104_F04
0
10
100 LOAD CURRENT (mA)
1000
MP2104-EC02
Figure 4--VIN = 2.5V to 6V, VOUT = 1.8V, ILOAD = 600mA Step-Down Circuit (L = 10H 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 (c) 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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MP2104 - 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
PACKAGE INFORMATION
TSOT23-5
2.90 BSC
3
0.950 TYP .
0.950 TYP .
10TYP. (2 plcs)
3
C L
1.60 BSC
2.80 BSC
0
0.25 BSC.
+ 4 - 0
0.400
0.10
0.300(Min) 0.500(Max) (5 PLCS)
Gauge Plane
C L
0.870.03
1.00 Max.
SEATING PLANE
0.00-0.10
0.127 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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