Datasheet MP2104DJ, MP2104DJ-1.5, MP2104DJ-1.8 Datasheet (MPS) [ru]

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Page 1

MP2104

1.7MHz, 600mA Synchronous

Step-Down Converter

The Future of Analog IC Technology

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 Output Voltage

MP2104DJ-1.5 V MP2104DJ-1.8 V

MP2104DJ V

EVALUATION BOARD REFERENCE

Board Number Dimensions

EV2104DJ-00A 2.0”X x 2.0”Y x 0.5”Z

= 1.5V

OUT

= 1.8V

OUT

= 0.6V to 6V

OUT

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.

TYPICAL APPLICATION

Efficiency vs Load Current

100

= 3.3V

INPUT

2.5V - 6V

OUTPUT

1.8V 600mA

MP2104DJ-1.8

OFF ON

GND

OUTEN

MP2104_TAC_S01

EFFICIENCY (%)

10 100 1000

= 4.2V

LOAD CURRENT (mA)

MP2104-EC01

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MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER

PACKAGE REFERENCE

TOP VIEW

GND

Part Number* Package Temperature

MP2104DJ TSOT23-5

For Tape & Reel, add suffix –Z (eg. MP2104DJ–Z)

For Lead Free, add suffix –LF (eg. MP2104DJ–LF–Z)

ABSOLUTE MAXIMUM RATINGS

VIN to GND ..................................–0.3V to +6.5V

to GND........................... –0.3V to VIN +0.3V

, VEN to GND ..........................–0.3V to +6.5V

SW Peak Current........................................ 1.4A

Junction Temperature.............................+150°C

Lead Temperature

Storage Temperature ............. –65°C to +150°C

54FB

C2YW

MP2104_PD01-TSOT23-5

–40°C to +85°C

(2)

..............................+260°C

(1)

TOP VIEW

GND

Part Number** Package Marking Temp

MP2104DJ-1.5

MP2104DJ-1.8

For Tape & Reel, add suffix –Z (eg. MP2104DJ-1.5–Z)

For Lead Free, add suffix –LF (eg. MP2104DJ-1.5–LF–Z)

Recommended Operating Conditions

TSOT23-5 D7YW

TSOT23-5 D8YW

MARKING

54OUT

MP2104_PD02-TSOT23-5

–40°C to

+85°C

(3)

Supply Voltage VIN............................. 2.5V to 6V

Output Voltage V

.......................... 0.6V to 6V

OUT

Operating Temperature .............–40°C to +85°C

Thermal Resistance

(4)

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 Threshold

IN Under Voltage Lockout Hysteresis

Regulated FB Voltage

FB Input Bias Current VFB = 0.65V, MP2104DJ –50 0.5 +50 nA

Rising Edge 2.10 2.27 2.45 V

55 mV

TA = +25°C, MP2104DJ 0.588 0.600 0.612

–40°C ≤ T

≤ +85°C 0.582 0.600 0.618

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MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER

ELECTRICAL CHARACTERISTICS (continued)

(5)

VIN = VEN = 3.6V, TA = +25°C, unless otherwise noted.

Parameter Symbol Condition Min Typ Max Units

MP2104DJ-1.5

= 50mA

OUT

Regulated Output Voltage

–40°C ≤ T

≤ +85°C

MP2104DJ-1.8 I

= 50mA

OUT

–40°C ≤ T

≤ +85°C

PFET On Resistance ISW = 100mA 0.44 Ω

NFET On Resistance ISW = –100mA 0.29 Ω

SW Leakage Current

PFET Current Limit

Duty Cycle = 100%,

= 0V, VIN = 6V

= 0V or 6V

Current Pulse Width < 1ms

Oscillator Frequency 1.26 1.70 2.08 MHz

Thermal Shutdown Trip Threshold

145

EN Trip Threshold –40°C ≤ TA ≤ +85°C 0.3 0.96 1.5 V

EN Input Current VEN = 0V to 6V –1 +1 µA

Notes:

5) 100% production test at +25°C. Typical and temperature specifications are guaranteed by design and characterization.

1.455 1.500 1.545

1.746 1.800 1.854

–1 +1 µA

0.7 1.0 1.35 A

°C

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MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER

TYPICAL PERFORMANCE CHARACTERISTICS

VIN = 3.3V, V

= 1.8V, L1 = 10µH, C1 = 4.7µF, C3 = 10µF, TA = +25°C, unless otherwise noted.

OUT

Efficiency vs Load Current

100

= 4.2V

EFFICIENCY (%)

10 100 1000

LOAD CURRENT (mA)

= 3.3V

Efficiency vs Load Current

100

EFFICIENCY (%)

10 100 1000

LOAD CURRENT (mA)

V V

OUT IN

= 1.8V

= 3.3V

MP2104-TPC01

MP2104-TPC03

Efficiency vs Load Current

100

= 3.3V

EFFICIENCY (%)

10 100 1000

= 4.2V

LOAD CURRENT (mA)

Efficiency vs Load Current

100

EFFICIENCY (%)

10 100 1000

LOAD CURRENT (mA)

V V

OUT IN

= 1.8V

= 4.2V

MP2104-TPC02

MP2104-TPC04

Output Voltage vs Load Current

1.85

1.83

1.81

1.79

1.77

1.75

1.73

1.71

1.69

OUTPUT VOLTAGE (V)

1.67

1.65

0 100 200 300 400 500 600 700 800 900

LOAD CURRENT (mA)

Output Voltage vs Supply Voltage

1.810

1.808

1.806

1.804

1.802

OUTPUT VOLTAGE (V)

1.800 23456

SUPPLY VOLTAGE (V)

LOAD

= 200mA

= 3.3V

MP2104-TPC05

MP2104-TPC06

Regulated FB Voltage vs Temperature

0.620

0.615

0.610

0.605

0.600

0.595

0.590

0.585

REGULATED FB VOLTAGE (V)

0.580

-50 -30 -10 10 30 40 70 90 110 130 -50 -30 -10 10 30 40 70 90 110 130 TEMPERATURE (°C)

MP2104-TPC07

PFET Current Limit vs Temperature

1.3

1.2

1.1

1.0

0.9

0.8

PFET CURRENT LIMIT (A)

0.7

TEMPERATURE (°C)

MP2104-TPC08

Oscillator Frequency vs Supply Voltage

2.05

1.95

1.85

1.75

1.65

1.55

1.45

1.35

OSCILLATOR FREQUENCY (MHz)

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

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MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

VIN = 3.3V, V

= 1.8V, L1 = 10µH, C1 = 4.7µF, C3 = 10µF, TA = +25°C, unless otherwise noted.

OUT

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MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER

PIN FUNCTIONS

Pin # Name Description

1 EN

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 < 0.1µA).

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.

5 FB

5 OUT

Feedback Input (MP2104DJ). Connect FB to the center point of the external resistor divider. The feedback threshold voltage is 0.6V.

Output Voltage Sense Input (MP2104DJ-1.5 and MP2104DJ-1.8). An internal resistor divider is 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

an external Schottky diode. The MP2104 can achieve 100% duty cycle. The duty cycle D of a step-down converter is defined as:

OUT

Where T

OSCON

is the main switch on time, f

%100fTD

×≈××=

the oscillator frequency (1.7MHz), V output voltage and V

is the input voltage.

%100

is the

OUT

OSC

IAMP

10X

MAIN SWITCH (PCH)

SYNCHRONOUS RECTIFIER (NCH)

GND

MP2104_BD01

BIAS

VOLTAGE

REFERENCE

0.6V

FEEDBACK

ERROR

AMP

EAMP

17pF

ICS

SLOPE COMP

EAO

PWMCMP

1.7MHz

OSCILLATOR

PWM

OSC

PWM

CONTROL

LOGIC

CURRENT

SENSE

AMP

Figure 1—Functional Block Diagram (MP2104)

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MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER

BIAS

FEEDBACK

OUT

VOLTAGE

REFERENCE

0.6V

AMP

EAMP

17pF

ERROR

ICS

SLOPE COMP

EAO

PWMCMP

1.7MHz

OSCILLATOR

PWM

OSC

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

IAMP

10X

MAIN SWITCH (PCH)

SYNCHRONOUS RECTIFIER (NCH)

PWM

CONTROL

LOGIC

CURRENT

SENSE

AMP

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.

GND

MP2104_BD01

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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 300kΩ for optimal transient response. R2 is then given by:

OUT

Table 1—Resistor Selection vs. Output

Voltage Setting

R1 R2

OUT

1.2V

1.5V

1.8V

2.5V

300k

Ω (1%) 300kΩ (1%)

300kΩ (1%) 200kΩ (1%)

300kΩ (1%) 150kΩ (1%)

300kΩ (1%) 95.3kΩ (1%)

−

V6.0

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:

()

VVV

−×

OUTINOUT

Where ∆I

is the inductor ripple current. Choose

fIV

×∆×

inductor ripple current approximately 30% of the maximum load current, 600mA.

The maximum inductor peak current is:

LOAD)MAX(L

Under light load conditions below 100mA, larger inductance is recommended for improved efficiency. Table 3 lists inductors recommended for this purpose.

OSCLIN

∆

Table 2—Suggested Surface Mount Inductors

Saturation

Manufacturer Part Number Inductance (µH) Max DCR (Ω)

Coilcraft LP1704-222M 2.2 0.07 1.7 6.5x5.3x2

Toko D312C 2.2 0.14 1.0 3.6x3.6x1

Sumida CDRH3D16 2.2 0.072 1.2 4x4x1.8

Taiyo Yuden LBC2518 2.2 0.13 0.6 2.5x1.8x1.8

Current (A)

Dimensions

LxWxH (mm

)

Table 3—Inductors for Improved Efficiency at 25mA, 50mA, under 100mA Load.

Saturation

Manufacturer Part Number Inductance (µH) Max DCR (Ω)

Coilcraft DO1605T-103MX 10 0.3 1.0 0.9

Murata LQH4C100K04 10 0.2 1.2 0.8 Sumida CMD4D06-100 10 0.3 0.7 0.5 Sumida CR32-100 10 0.2 1.0 0.7 Sumida CR54-100 10 0.1 1.2 1.4

Current (A) I

RMS

(A)

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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 4.7µF 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 ∆V

≤∆

OUT

()

is approximately:

OUT

−×

VVV

××

⎛

OUTINOUT

⎜

ESR

⎜

LfV

⎝

+×

OSCOSCIN

⎞ ⎟

⎟

××

3Cf8

⎠

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

= 3.3V

INPUT

2.5V - 6V

OFF ON

Figure 4—V

MP2104

FBEN

GND

= 2.5V to 6V, V

= 1.8V, I

OUT

OUTPUT

1.8V 600mA

MP2104_F04

LOAD

= 600mA Step-Down Circuit

EFFICIENCY (%)

10 100 1000

= 4.2V

LOAD CURRENT (mA)

MP2104-EC02

(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.

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MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER

PACKAGE INFORMATION

TSOT23-5

0.950 TYP

2.90 BSC

0.950 TYP

10°TYP.

(2 plcs)

C L

0.300(Min)

0.500(Max) (5

PLCS)

1.00

Max.

1.60 BSC

0.87±0.03

0.00-0.10

2.80 BSC

SEATING PLANE

0.25 BSC.

Gauge Plane

10° TYP. (2 plcs)

0.400

0.127 TYP.

0°

4°

0°

±0.10

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.

Page 11

Datasheet MP2104DJ, MP2104DJ-1.5, MP2104DJ-1.8 Datasheet (MPS) [ru]

Specifications and Main Features

Frequently Asked Questions

User Manual