TPS62046DRCRG4 [TI]

3.3-V Output, 1.2-A, 95% Efficient Step-Down Converter, 18uA, MSOP-10, QFN-10 10-VSON -40 to 85;


型号：	TPS62046DRCRG4
厂家：	TEXAS INSTRUMENTS
描述：	3.3-V Output, 1.2-A, 95% Efficient Step-Down Converter, 18uA, MSOP-10, QFN-10 10-VSON -40 to 85 开关光电二极管
文件：	总30页 (文件大小：1120K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

www.ti.com

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

1.2 A/1.25 MHz, HIGH-EFFICIENCY STEP-DOWN CONVERTER

USB Powered Modems

FEATURES

CPUs and DSPs

Up to 95% Conversion Efficiency

Typical Quiescent Current: 18 µA

Load Current: 1.2 A

PC Cards and Notebooks

xDSL Applications

Standard 5-V to 3.3-V Conversion

Operating Input Voltage Range: 2.5 V to 6.0 V

Switching Frequency: 1.25 MHz

Adjustable and Fixed Output Voltage

DESCRIPTION

The TPS6204x family of devices are high efficiency

synchronous step-down dc-dc converters optimized for

battery powered portable applications. The devices are

ideal for portable applications powered by a single Li-Ion

battery cell or by 3-cell NiMH/NiCd batteries. With an

output voltage range from 6.0 V down to 0.7 V, the devices

support low voltage DSPs and processors in PDAs,

pocket PCs, as well as notebooks and subnotebook

computers. The TPS6204x operates at a fixed switching

frequency of 1.25 MHz and enters the power save mode

operation at light load currents to maintain high efficiency

over the entire load current range. For low noise

applications, the devices can be forced into fixed

frequency PWM mode by pulling the MODE pin high. The

TPS6204x supports up to 1.2-A load current.

Power Save Mode Operation at Light load

Currents

100% Duty Cycle for Lowest Dropout

Internal Softstart

Dynamic Output Voltage Positioning

Thermal Shutdown

Short-Circuit Protection

10 Pin MSOP PowerPad™ Package

10 Pin QFN 3 X 3 mm Package

APPLICATIONS

PDA, Pocket PC and Smart Phones

EFFICIENCY

LOAD CURRENT

100

= 1.8 V

Typical Application Circuit 1.2-A Output Current

V = 2.7 V

V = 3.6 V

TPS6204x

6.2 µH

0.7 V to V /1.2 A

2.5 V to 6 V

V = 5 V

VIN

22 µF

PGND

MODE

GND

MODE = Low

PGND

V = 3.6 V

MODE = High

0.01

0.1

100

1 k

10 k

− Load Current − mA

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

www.ti.com

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during

storage or handling to prevent electrostatic damage to the MOS gates.

ORDERING INFORMATION

PACKAGE

PACKAGE MARKING

MSOP

VOLTAGE OPTIONS

(1)

(2)

MSOP

QFN

BBO

BBS

BBT

BBU

BBW

Adjustable

1.5 V

TPS62040DGQ

TPS62042DGQ

TPS62043DGQ

TPS62044DGQ

TPS62046DGQ

TPS62040DRC

TPS62042DRC

TPS62043DRC

TPS62044DRC

TPS62046DRC

BBI

BBL

BBM

BBN

BBQ

1.6 V

−40°C to 85°C

1.8 V

3.3 V

(1)

(2)

The DGQ package is available in tape and reel. Add R suffix (DGQR) to order quantities of 2500 parts per reel.

The DRC package is available in tape and reel. Add R suffix (DRCR) to order quantities of 3000 parts per reel.

ABSOLUTE MAXIMUM RATINGS

(1)

over operating free-air temperature range unless otherwise noted

UNITS

(2)

Supply voltage VIN

−0.3 V to 7 V

(2)

Voltages on EN, MODE, FB, SW

−0.3 V to V +0.3 V

Continuous power dissipation

See Dissipation Rating Table

−40°C to 150°C

−65°C to 150°C

260°C

Operating junction temperature range

Storage temperature range

Lead temperature (soldering, 10 sec)

(1)

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied.

Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2)

All voltage values are with respect to network ground terminal.

PACKAGE DISSIPATION RATINGS

≤ 25°C

T = 70°C

POWER RATING

T = 85°C

POWER RATING

(1)

PACKAGE

POWER RATING

MSOP

QFN

60°C/W

1.67 W

917 mW

667 mW

48.7°C/W

2.05 W

1.13 W

821 mW

(1)

The thermal resistance, R

is based on a soldered PowerPAD using thermal vias.

RECOMMENDED OPERATING CONDITIONS

MIN

TYP

MAX

UNIT

Supply voltage

2.5

0.7

6.0

Output voltage range for adjustable output voltage version

Output current

1.2

(1)

Inductor

6.2

µH

µF

°C

(1)

Input capacitor

(1)

Output capacitor

Operating ambient temperature

Operating junction temperature

−40

125

(1)

Refer to application section for further information

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

www.ti.com

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

ELECTRICAL CHARACTERISTICS

(1)

V = 3.6 V, V = 1.8 V, I = 600 mA, EN = VIN, T = −40°C to 85°C typical values are at T = 25°C (unless otherwise noted)

SUPPLY CURRENT

PARAMETER

TEST CONDITIONS

MIN

2.5

TYP

MAX

6.0

UNIT

Input voltage range

Operating quiescent current

Shutdown supply current

Under−voltage lockout threshold

= 0 mA, device is not switching

µA

(Q)

EN = GND

0.1

UVLO

1.5

1.4

2.3

ENABLE AND MODE

EN high level input voltage

EN low level input voltage

EN input bias current

0.4

1.0

EN = GND or VIN

0.01

µA

MODE high level input voltage

MODE low level input voltage

MODE input bias current

1.4

(MODE)

0.4

1.0

MODE = GND or VIN

µA

POWER SWITCH

P-channel MOSFET on−resistance

V = V = 3.6 V

115

145

210

270

mΩ

µA

mΩ

µA

DS(ON)

P-channel MOSFET on−resistance

P-channel leakage current

N-channel MOSFET on−resistance

N-channel leakage current

P-channel current limit

V = V = 2.5 V

= 6.0 V

lkg(P)

V = V = 3.6 V

200

280

DS(ON)

V = V = 2.5 V

115

= 6.0 V

Ikg(N)

2.5 V < V < 6.0 V

1.5 1.85

150

2.2

Thermal shutdown

°C

OSCILLATOR

= 0.5 V

= 0 V

1.25

625

1.5

MHz

kHz

Oscillator frequency

OUTPUT

Adjustable output voltage range

Reference voltage

TPS62040

0.7

ref

0.5

TPS62040 V = 2.5 V to 6.0 V; I = 0 mA

Feedback voltage

Adjustable V = 2.5 V to 6.0 V; 0 mA ≤ I ≤ 1.2 A

−3%

TPS62042 V = 2.5 V to 6.0 V; I = 0 mA

1.5V

V = 2.5 V to 6.0 V; 0 mA ≤ I ≤ 1.2 A

I O

−3%

TPS62043 V = 2.5 V to 6.0 V; I = 0 mA

1.6V

V = 2.5 V to 6.0 V; 0 mA ≤ I ≤ 1.2 A

I O

−3%

Fixed output voltage

TPS62044 V = 2.5 V to 6.0 V; I = 0 mA

1.8V

V = 2.5 V to 6.0 V; 0 mA ≤ I ≤ 1.2 A

I O

−3%

TPS62046 V = 3.6 V to 6.0 V; I = 0 mA

3.3V

V = 3.6 V to 6.0 V; 0 mA ≤ I ≤ 1.2 A

I O

−3%

V = V + 0.5 V (min. 2.5 V) to 6.0 V,

(1)

Line regulation

%/V

= 10 mA

(1)

Load regulation

= 10 mA to 1200 mA

0.1

625

%/mA

µA

Leakage current into SW pin

V >V , 0 V ≤ Vsw ≤ V

Ikg(SW)

Reverse leakage current into pin SW

Short circuit switching frequency

V = open; EN = GND; V

= 6.0 V

µA

= 0 V

kHz

(1)

The line and load regulations are digitally controlled to assure an output voltage accuracy of 3%.

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

www.ti.com

PIN ASSIGNMENTS

DGQ PACKAGE

(TOP VIEW)

DRC PACKAGE

(TOP VIEW)

PGND

MODE

VIN

GND

VIN

GND

PGND

MODE

NOTE The PowerPAD must be connected to GND.

Terminal Functions

TERMINAL

NAME NO.

I/O

DESCRIPTION

Enable. Pulling EN to ground forces the device into shutdown mode. Pulling EN to V enables the device. EN should

not be left floating and must be terminated.

VIN

GND

2,3

Supply voltage input

Analog ground

Feedback pin. Connect FB directly to the output if the fixed output voltage version is used. For the adjustable version

an external resistor divider is connected to this pin. The internal voltage divider is disabled for the adjustable version.

MODE

Pulling the MODE pin high allows the device to be forced into fixed frequency operation. Pulling the MODE pin to low

enables the power save mode where the device operates in fixed frequency PWM mode at high load currents and

in PFM mode (pulse frequency modulation) at light load currents.

7,8

I/O This is the switch pin of the converter and is connected to the drain of the internal power MOSFETs

Power ground

PGND

9,10

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

www.ti.com

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

FUNCTIONAL BLOCK DIAGRAM

VIN

Current limit Comparator

Ref

VIN

Undervoltage

Lockout

Bias supply

−

Soft

Start

SkipComparator

Ref

−

MODE

Vcomp

1.25 MHz

Oscillator

Comparator

Driver

Shoot−thru

Logic

Control Logic

Saw Tooth

Generator

−

Comp High

Comp Low

Comp Low 2

Comp High

LoadComparator

−

Compensation

Comp Low

−

Comp Low 2

Vref = 0.5 V

PGND

MODE

GND

For the Adjustable Version the FB Pin Is

Directly Connected to the Gm Amplifier

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

www.ti.com

TYPICAL CHARACTERISTICS

TABLE OF GRAPHS

FIGURE

Efficiency

vs Load current

vs Input voltage

1, 2, 3

Efficiency

Quiescent current

Switching frequency

5, 6

P-Channel r

DS(on)

N-Channel rectifier r

)

DS(on)

DS(on

Load transient response

PWM operation

Power save mode

Start-up

EFFICIENCY

LOAD CURRENT

100

= 3.3 V

= 1.8 V

V = 2.7 V

V = 3.6 V

MODE = Low

V = 3.6 V

V = 5 V

MODE = Low

V = 5 V

V = 3.6 V

MODE = High

MODE = Low

V = 3.6 V

V = 5 V

MODE = High

0.01 0.1

100

1 k 10 k

0.01

0.1

100

1 k

10 k

− Load Current − mA

Figure 1

Figure 2

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

www.ti.com

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

EFFICIENCY

LOAD CURRENT

INPUT VOLTAGE

100

= 1.5 V

= 1.8 V

MODE = Low

V = 2.7 V

I = 500 mA

V = 3.6 V

V = 5 V

I = 1000 mA

I = 1 mA

0.01

0.1

100

1 k

10 k

2.5

3.5

4.5

5.5

− Load Current − mA

V − Input Voltage − V

Figure 3

Figure 4

QUIESCENT CURRENT

INPUT VOLTAGE

7.5

MODE = Low

MODE = High

T = 85°C

6.5

T = 25°C

T = −40°C

5.5

4.5

3.5

2.5

3.5

4.5

5.5

2.4 2.8 3.2 3.6

4.4 4.8 5.2 5.6

V − Input Voltage − V

Figure 5

Figure 6

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

www.ti.com

SWITCHING FREQUENCY

P-CHANNEL r_DS(on)

INPUT VOLTAGE

0.180

0.170

0.160

0.150

0.140

0.130

1.23

1.22

1.21

1.20

1.19

T = 85°C

T = 25°C

= 85°C

= 25°C

T = −40°C

0.120

0.110

0.100

= −40°C

0.090

0.080

1.18

2.5 2.9 3.3 3.7 4.1 4.5

4.9 5.3 5.7

2.5 2.9 3.3 3.7 4.1 4.5

4.9 5.3 5.7

V − Input Voltage − V

Figure 7

Figure 8

N-CHANNEL RECTIFIER r_DS(on)

INPUT VOLTAGE

0.150

0.140

0.130

0.120

= 85°C

= 25°C

0.110

0.100

0.090

0.080

0.070

= −40°C

0.060

0.050

2.5 2.9 3.3 3.7 4.1 4.5

4.9 5.3 5.7

V − Input Voltage − V

Figure 9

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

www.ti.com

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

PWM OPERATION

LOAD TRANSIENT RESPONSE

V = 3.6 V

= 1.8 V

PWM/PFM Operation

500 ns/div

50 µs/div

Figure 10

Figure 11

POWER SAVE MODE

START-UP

V = 3.6 V

= 1.8 V

= 1.1 A

200 µs/div

2.5 µs/div

Figure 12

Figure 13

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

www.ti.com

DETAILED DESCRIPTION

OPERATION

The TPS6204x is a synchronous step-down converter operating with typically 1.25 MHz fixed frequency. At moderate

to heavy load currents, the device operates in pulse width modulation (PWM), and at light load currents, the device

enters power save mode operation using pulse frequency modulation (PFM). When operating in PWM mode, the

typical switching frequency is 1.25 MHz with a minimum switching frequency of 1 MHz. This makes the device

suitable for xDSL applications minimizing RF (radio frequency) interference.

During PWM operation the converter uses a unique fast response voltage mode controller scheme with input voltage

feed−forward to achieve good line and load regulation, allowing the use of small ceramic input and output capacitors.

At the beginning of each clock cycle initiated by the clock signal (S) the P-channel MOSFET switch turns on and the

inductor current ramps up until the comparator trips and the control logic turns off the switch. The current limit

comparator also turns off the switch in case the current limit of the P-channel switch is exceeded. After the dead time

preventing current shoot through, the N-channel MOSFET rectifier is turned on and the inductor current ramps down.

The next cycle is initiated by the clock signal, again turning off the N-channel rectifier and turning on the P-channel

switch.

The Gm amplifier as well as the input voltage determines the rise time of the saw tooth generator, and therefore, any

change in input voltage or output voltage directly controls the duty cycle of the converter, giving a very good line and

load transient regulation.

POWER SAVE MODE OPERATION

As the load current decreases, the converter enters power save mode operation. During power save mode the

converter operates with reduced switching frequency in PFM mode and with a minimum quiescent current

maintaining high efficiency.

The converter monitors the average inductor current and the device enters power save mode when the average

inductor current is below the threshold. The transition point between PWM and power save mode is given by the

transition current with the following equation:

18.66 W

transition

(1)

During power save mode the output voltage is monitored with the comparator by the threshold’s comp low and comp

high. As the output voltage falls below the comp low threshold set to typically 0.8% above the nominal output voltage,

the P-channel switch turns on. The P-channel switch remains on until the transition current (1) is reached. Then the

N-channel switch turns on completing the first cycle. The converter continues to switch with its normal duty cycle

determined by the input and output voltage but with half the nominal switching frequency of 625-kHz typ. Thus the

output voltage rises and as soon as the output voltage reaches the comp high threshold of 1.6%, the converter stops

switching. Depending on the load current, the converter switches for a longer or shorter period of time in order to

deliver the energy to the output. If the load current increases and the output voltage can not be maintained with the

transition current , equation (1), the converter enters PWM again. See Figure 11 and Figure 12 under the typical

graphs section and Figure 14 for power save mode operation. Among other techniques this advanced power save

mode method allows high efficiency over the entire load current range and a small output ripple of typically 1% of

the nominal output voltage.

Setting the power save mode thresholds to typically 0.8% and 1.6% above the nominal output voltage at light load

current results in a dynamic voltage positioning achieving lower absolute voltage drops during heavy load transient

changes. This allows the converter to operate with small output capacitors like 22 µF and still having a low absolute

voltage drop during heavy load transient. Refer to Figure 14 as well for detailed operation of the power save mode.

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

www.ti.com

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

PFM Mode at Light Load

Comp High

Comp Low

1.6%

0.8%

Comp Low 2

PWM Mode at Medium to Full Load

Figure 14. Power Save Mode Thresholds and Dynamic Voltage Positioning

The converter enters the fixed frequency PWM mode as soon as the output voltage falls below the comp low 2

threshold.

DYNAMIC VOLTAGE POSITIONING

As described in the power save mode operation sections before and as detailed in Figure 14 the output voltage is

typically 0.8% (i.e., 1% on average) above the nominal output voltage at light load currents, as the device is in power

save mode. This gives additional headroom for the voltage drop during a load transient from light load to full load.

In the other direction during a load transient from full load to light load the voltage overshoot is also minimized by

turning on the N-Channel rectifier switch to pull the output voltage actively down.

MODE (AUTOMATIC PWM/PFM OPERATION AND FORCED PWM OPERATION)

Connecting the MODE pin to GND enables the automatic PWM and power save mode operation. The converter

operates in fixed frequency PWM mode at moderate to heavy loads and in the PFM mode during light loads,

maintaining high efficiency over a wide load current range.

Pulling the MODE pin high forces the converter to operate constantly in the PWM mode even at light load currents.

The advantage is the converter operates with a fixed switching frequency that allows simple filtering of the switching

frequency for noise sensitive applications. In this mode, the efficiency is lower compared to the power save mode

during light loads (see Figure 1 to Figure 3). For additional flexibility it is possible to switch from power save mode

to forced PWM mode during operation. This allows efficient power management by adjusting the operation of the

TPS6204x to the specific system requirements.

100% DUTY CYCLE LOW DROPOUT OPERATION

The TPS6204x offers a low input to output voltage difference while still maintaining regulation with the use of the 100%

duty cycle mode. In this mode, the P−Channel switch is constantly turned on. This is particularly useful in battery

powered applications to achieve longest operation time by taking full advantage of the whole battery voltage range.

i.e. The minimum input voltage to maintain regulation depends on the load current and output voltage and can be

calculated as:

_maxǒ_{rDS(on) max ) R}Ǔ

V min + V max ) I

(2)

with:

= maximum output current plus inductor ripple current

O(max)

max= maximum P-channel switch t

DS(on)

R = DC resistance of the inductor

V max = nominal output voltage plus maximum output voltage tolerance

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

www.ti.com

SOFTSTART

The TPS6204x series has an internal softstart circuit that limits the inrush current during start up. This prevents

possible voltage drops of the input voltage in case a battery or a high impedance power source is connected to the

input of the TPS6204x.

The softstart is implemented with a digital circuit increasing the switch current in steps of typically I /8, I /4, I /2

LIM

and then the typical switch current limit 1.85 A as specified in the electrical parameter table. The start-up time mainly

depends on the output capacitor and load current, see Figure 13.

SHORT-CIRCUIT PROTECTION

As soon as the output voltage falls below 50% of the nominal output voltage, the converter switching frequency as

well as the current limit is reduced to 50% of the nominal value. Since the short-circuit protection is enabled during

start-up, the device does not deliver more than half of its nominal current limit until the output voltage exceeds 50%

of the nominal output voltage. This needs to be considered in case a load acting as a current sink is connected to

the output of the converter.

THERMAL SHUTDOWN

As soon as the junction temperature of typically 150_C is exceeded the device goes into thermal shutdown. In this

mode, the P-Channel switch and N-Channel rectifier are turned off. The device continues its operation when the

junction temperature falls below typically 150°C again.

ENABLE

Pulling the EN low forces the part into shutdown mode, with a shutdown current of typically 0.1 µA. In this mode, the

P-Channel switch and N-Channel rectifier are turned off and the whole device is in shut down. If an output voltage

is present during shut down, which could be an external voltage source or super cap, the reverse leakage current

is specified under electrical parameter table. For proper operation the enable (EN) pin must be terminated and should

not be left floating.

Pulling EN high starts up the TPS6204x with the softstart as described under the section Softstart.

UNDERVOLTAGE LOCKOUT

The undervoltage lockout circuit prevents device misoperation at low input voltages. It prevents the converter from

turning on the switch or rectifier MOSFET with undefined conditions.

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

www.ti.com

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

APPLICATION INFORMATION

ADJUSTABLE OUTPUT VOLTAGE VERSION

When the adjustable output voltage version TPS62040 is used, the output voltage is set by the external resistor

divider. See Figure 15.

The output voltage is calculated as:

_{+ 0.5 V}ǒ_{1 )}Ǔ

(3)

with R1 + R2 ≤ 1 MΩ and internal reference voltage V typical = 0.5 V

ref

R1 + R2 should not be greater than 1 MΩ because of stability reasons. To keep the operating quiescent current to

a minimum, the feedback resistor divider should have high impedance with R1+R2≤1 MΩ. Due to this and the low

reference voltage of V = 0.5 V, the noise on the feedback pin (FB) needs to be minimized. Using a capacitive divider

ref

C1 and C2 across the feedback resistors minimizes the noise at the feedback, without degrading the line or load

transient performance.

C1 and C2 should be selected as:

C1 +

2 p 10 kHz R1

(4)

with:

R1 = upper resistor of voltage divider

C1 = upper capacitor of voltage divider

For C1 a value should be chosen that comes closest to the calculated result.

C2 +

(5)

with:

R2 = lower resistor of voltage divider

C2 = lower capacitor of voltage divider

For C2, the selected capacitor value should always be selected larger than the calculated result. For example, in

Figure 15 for C2 100 pF are selected for a calculated result of C2 = 88.42 pF.

If quiescent current is not a key design parameter C1 and C2 can be omitted, and a low impedance feedback divider

has to be used with R1 + R2 < 100 kΩ. This reduces the noise available on the feedback pin (FB) as well but increases

the overall quiescent current during operation. The higher the programmed output voltage the lower the feedback

impedance has to be for best operation when not using C1 and C2.

TPS62040

1.8 V / 1.2 A

10 µH

2.5 V to 6 V

VIN

10 µF

470 kΩ

10 µF

33 pF

PGND

MODE

GND

PGND

180 kΩ

100 pF

Figure 15. Adjustable Output Voltage Version

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

www.ti.com

Inductor Selection

The TPS6204x typically uses a 6.2-µH output inductor. Larger or smaller inductor values can be used to optimize

the performance of the device for specific operation conditions. The selected inductor has to be rated for its dc

resistance and saturation current. The dc resistance of the inductance directly influences the efficiency of the

converter. Therefore an inductor with the lowest dc resistance should be selected for highest efficiency.

Formula (7) calculates the maximum inductor current under static load conditions. The saturation current of the

inductor should be rated higher than the maximum inductor current as calculated with formula (7). This is needed

because during heavy load transient the inductor current rises above the value calculated under (7).

1–

DI + V

L ƒ

(6)

(7)

I max + I max )

with

ƒ = Switching frequency (1.25 MHz typical)

L = Inductor value

∆I = Peak-to-peak inductor ripple current

I max = Maximum inductor current

The highest inductor current occurs at maximum V .

Open core inductors have a soft saturation characteristic and they can usually handle higher inductor currents versus

a comparable shielded inductor. A more conservative approach is to select the inductor current rating just for the

maximum switch current of 2.2 A for the TPS6204x. Keep in mind that the core material from inductor to inductor

differs and has an impact on the efficiency, especially at high switching frequencies. Refer to Table 1 and the typical

applications and inductors selection.

Table 1. Inductor Selection

INDUCTOR VALUE

4.7 µH

DIMENSIONS

COMPONENT SUPPLIER

Sumida CDRH4D28C-4.7

Coiltronics SD25-4R7

5,0 mm × 5,0 mm × 3,0 mm

5,2 mm × 5,2 mm × 2,5 mm

5,7 mm × 5,7 mm × 3,0 mm

7,0 mm × 7,0 mm × 3,0 mm

4.7 µH

5.3 µH

Sumida CDRH5D28-5R3

Sumida CDRH5D28-6R2

Sumida CDRH6D28-6R0

6.2 µH

6.0 µH

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

www.ti.com

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

Output Capacitor Selection

The advanced fast response voltage mode control scheme of the TPS6204x allows the use of small ceramic

capacitors with a typical value of 22 µF without having large output voltage under and overshoots during heavy load

transients. Ceramic capacitors having low ESR values have the lowest output voltage ripple and are recommended.

If required, tantalum capacitors may also be used. Refer to Table 2 for component selection.

If ceramic output capacitor are used, the capacitor RMS ripple current rating always meets the application

requirements. Just for completeness the RMS ripple current is calculated as:

1–

+ V

RMSCout

L ƒ

2 3

(8)

At nominal load current the device operates in PWM mode and the overall output voltage ripple is the sum of the

voltage spike caused by the output capacitor ESR plus the voltage ripple caused by charging and discharging the

output capacitor:

1–

DV + V

) ESR

L ƒ

8 C ƒ

(9)

Where the highest output voltage ripple occurs at the highest input voltage, V .

At light load currents, the device operates in power save mode and the output voltage ripple is independent of the

output capacitor value. The output voltage ripple is set by the internal comparator thresholds. The typical output

voltage ripple is 1% of the nominal output voltage.

Input Capacitor Selection

Because of the nature of the buck converter having a pulsating input current, a low ESR input capacitor is required

for best input voltage filtering and minimizing the interference with other circuits caused by high input voltage spikes.

The input capacitor should have a minimum value of 22 µF. The input capacitor can be increased without any limit

for better input voltage filtering.

Table 2. Input and Output Capacitor Selection

CAPACITOR

CASE SIZE

COMPONENT SUPPLIER

COMMENTS

VALUE

22 µF

1206

1210

Taiyo Yuden JMK316BJ226ML

Taiyo Yuden JMK325BJ226MM

Ceramic

22 µF

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

www.ti.com

Layout Considerations

For all switching power supplies, the layout is an important step in the design especially at high peak currents and

switching frequencies. If the layout is not carefully done, the regulator might show stability problems as well as EMI

problems. Therefore, use wide and short traces for the main current paths as indicated in bold in Figure 16. These

traces should be routed first. The input capacitor should be placed as close as possible to the IC pins as well as the

inductor and output capacitor. The feedback resistor network should be routed away from the inductor and switch

node to minimize noise and magnetic interference. To further minimize noise from coupling into the feedback network

and feedback pin, the ground plane or ground traces should be used for shielding. A common ground plane or a star

ground as shown below should be used. This becomes very important especially at high switching frequencies of

1.25 MHz.

The Switch Node Must Be

Kept as Small as Possible

10 µH

TPS6204x

VIN

22 µF

PGND

MODE

GND

PGND

Figure 16. Layout Diagram

THERMAL INFORMATION

One of the most influential components on the thermal performance of a package is board design. In order to take

full advantage of the heat dissipating abilities of the PowerPADt packages, a board should be used that acts similar

to a heat sink and allows for the use of the exposed (and solderable), deep downset pad. For further information

please refer to Texas Instruments application note (SLMA002) PowerPAD Thermally Enhanced Package.

The PowerPADt of the 10-pin MSOP package has an area of 1,52 mm × 1,79 mm ( 0,05 mm) and must be soldered

to the PCB to lower the thermal resistance. Thermal vias to the next layer further reduce the thermal resistance.

TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

www.ti.com

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

TYPICAL APPLICATIONS

TPS62046

6.2 µH

3.3 V / 1.2 A

Li-lon

VIN

22 µF

PGND

MODE

GND

PGND

Components:

C1: Taiyo Yuden JMK316BJ226ML

C2: Taiyo Yuden JMK316BJ226ML

L1: Sumida CDRH5D28−6R2

Figure 17. Li-Ion to 3.3 V/1.2 A Conversion

TPS62040

1.8 V / 1.2 A

4.7 µH

2.5 V to 6 V

VIN

22 µF

33 pF

PGND

470 kΩ

MODE

GND

PGND

Components:

C1: Taiyo Yuden JMK316BJ226ML

C2: Taiyo Yuden JMK316BJ226ML

L1: Sumida CDRH4D28C−4R7

180 kΩ

100 pF

Figure 18. Li-Ion to 1.8 V/1.2 A Conversion Using the Adjustable Output Voltage Version

PACKAGE OPTION ADDENDUM

www.ti.com

17-May-2014

PACKAGING INFORMATION

Orderable Device

TPS62040DGQ

Status Package Type Package Pins Package

Eco Plan

Lead/Ball Finish

MSL Peak Temp

Op Temp (°C)

-40 to 85

Device Marking

Samples

Drawing

Qty

(1)

(2)

(6)

(3)

(4/5)

ACTIVE

MSOP-

PowerPAD

DGQ

Green (RoHS

& no Sb/Br)

CU NIPDAUAG

CU NIPDAU

CU NIPDAUAG

CU NIPDAU

CU NIPDAUAG

Call TI

Level-1-260C-UNLIM

Level-2-260C-1 YEAR

Level-1-260C-UNLIM

Level-2-260C-1 YEAR

Level-1-260C-UNLIM

Call TI

BBI

TPS62040DGQG4

TPS62040DGQR

TPS62040DGQRG4

TPS62040DRCR

TPS62040DRCRG4

TPS62042DGQ

ACTIVE

MSOP-

PowerPAD

DGQ

DRC

DGQ

DRC

DGQ

DRC

Green (RoHS

& no Sb/Br)

BBI

MSOP-

PowerPAD

2500

3000

Green (RoHS

& no Sb/Br)

BBI

MSOP-

PowerPAD

Green (RoHS

& no Sb/Br)

BBI

SON

Green (RoHS

& no Sb/Br)

BBO

BBL

BBS

BBM

SON

Green (RoHS

& no Sb/Br)

MSOP-

PowerPAD

Green (RoHS

& no Sb/Br)

TPS62042DGQG4

TPS62042DGQR

TPS62042DGQRG4

TPS62042DRCR

TPS62042DRCRG4

TPS62043DGQ

MSOP-

PowerPAD

Green (RoHS

& no Sb/Br)

MSOP-

PowerPAD

2500

3000

Green (RoHS

& no Sb/Br)

MSOP-

PowerPAD

Green (RoHS

& no Sb/Br)

SON

Green (RoHS

& no Sb/Br)

SON

Green (RoHS

& no Sb/Br)

MSOP-

PowerPAD

Green (RoHS

& no Sb/Br)

TPS62043DGQG4

TPS62043DGQR

TPS62043DGQRG4

TPS62043DRCR

MSOP-

PowerPAD

TBD

MSOP-

PowerPAD

2500

3000

Green (RoHS

& no Sb/Br)

CU NIPDAUAG

Call TI

Level-1-260C-UNLIM

Call TI

BBM

BBT

MSOP-

PowerPAD

TBD

SON

Green (RoHS

& no Sb/Br)

CU NIPDAU

Level-2-260C-1 YEAR

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

17-May-2014

Orderable Device

Status Package Type Package Pins Package

Eco Plan

Lead/Ball Finish

MSL Peak Temp

Op Temp (°C)

Device Marking

Samples

Drawing

Qty

(1)

(2)

(6)

(3)

(4/5)

TPS62043DRCRG4

TPS62044DGQ

ACTIVE

SON

DRC

TBD

Call TI

-40 to 85

ACTIVE

MSOP-

PowerPAD

DGQ

DRC

DGQ

DRC

Green (RoHS

& no Sb/Br)

CU NIPDAUAG

Level-1-260C-UNLIM

BBN

BBU

BBQ

BBW

TPS62044DGQG4

TPS62044DGQR

TPS62044DGQRG4

TPS62044DRCR

TPS62044DRCRG4

TPS62046DGQ

MSOP-

PowerPAD

Green (RoHS

& no Sb/Br)

CU NIPDAUAG

CU NIPDAU

Level-1-260C-UNLIM

Level-2-260C-1 YEAR

Level-1-260C-UNLIM

Level-2-260C-1 YEAR

-40 to 85

MSOP-

PowerPAD

2500

3000

Green (RoHS

& no Sb/Br)

MSOP-

PowerPAD

Green (RoHS

& no Sb/Br)

SON

Green (RoHS

& no Sb/Br)

SON

Green (RoHS

& no Sb/Br)

CU NIPDAU

MSOP-

PowerPAD

Green (RoHS

& no Sb/Br)

CU NIPDAUAG

CU NIPDAU

TPS62046DGQG4

TPS62046DGQR

TPS62046DGQRG4

TPS62046DRCR

TPS62046DRCRG4

MSOP-

PowerPAD

Green (RoHS

& no Sb/Br)

MSOP-

PowerPAD

2500

3000

Green (RoHS

& no Sb/Br)

MSOP-

PowerPAD

Green (RoHS

& no Sb/Br)

SON

Green (RoHS

& no Sb/Br)

SON

Green (RoHS

& no Sb/Br)

CU NIPDAU

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

⁽²⁾Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability

information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Addendum-Page 2

PACKAGE OPTION ADDENDUM

www.ti.com

17-May-2014

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that

lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between

the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight

in homogeneous material)

⁽³⁾MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

⁽⁴⁾There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

⁽⁵⁾Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation

of the previous line and the two combined represent the entire Device Marking for that device.

⁽⁶⁾Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish

value exceeds the maximum column width.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

Addendum-Page 3

PACKAGE MATERIALS INFORMATION

www.ti.com

31-Jan-2014

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device

Package Package Pins

Type Drawing

SPQ

Reel

Pin1

Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant

(mm) W1 (mm)

TPS62040DGQR

MSOP-

Power

PAD

DGQ

2500

330.0

12.4

5.3

3.4

1.4

8.0

12.0

TPS62040DRCR

TPS62042DGQR

SON

DRC

DGQ

3000

2500

330.0

12.4

3.3

5.3

3.3

3.4

1.1

1.0

1.4

8.0

12.0

MSOP-

Power

PAD

TPS62042DRCR

TPS62043DGQR

SON

DRC

DGQ

3000

2500

330.0

12.4

3.3

5.3

3.3

3.4

1.1

1.0

1.4

8.0

12.0

MSOP-

Power

PAD

TPS62043DRCR

TPS62044DGQR

SON

DRC

DGQ

3000

2500

330.0

12.4

3.3

5.3

3.3

3.4

1.1

1.0

1.4

8.0

12.0

MSOP-

Power

PAD

TPS62044DRCR

SON

DRC

3000

330.0

12.4

3.3

1.1

8.0

12.0

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com

31-Jan-2014

Device

Package Package Pins

Type Drawing

SPQ

Reel

Pin1

Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant

(mm) W1 (mm)

TPS62044DRCR

TPS62046DGQR

SON

DRC

DGQ

3000

2500

330.0

12.4

3.3

5.3

3.3

3.4

1.0

1.4

8.0

12.0

MSOP-

Power

PAD

TPS62046DRCR

SON

DRC

3000

330.0

12.4

3.3

1.0

1.1

8.0

12.0

*All dimensions are nominal

Device

Package Type Package Drawing Pins

SPQ

Length (mm) Width (mm) Height (mm)

TPS62040DGQR

TPS62040DRCR

TPS62042DGQR

TPS62042DRCR

TPS62043DGQR

TPS62043DRCR

TPS62044DGQR

MSOP-PowerPAD

DGQ

DRC

DGQ

DRC

DGQ

DRC

DGQ

2500

3000

2500

3000

2500

3000

2500

364.0

367.0

370.0

364.0

367.0

370.0

364.0

367.0

370.0

364.0

367.0

355.0

364.0

367.0

355.0

364.0

367.0

355.0

364.0

27.0

35.0

55.0

27.0

35.0

55.0

27.0

35.0

55.0

27.0

SON

MSOP-PowerPAD

SON

MSOP-PowerPAD

SON

MSOP-PowerPAD

Pack Materials-Page 2

PACKAGE MATERIALS INFORMATION

www.ti.com

31-Jan-2014

Device

Package Type Package Drawing Pins

SPQ

Length (mm) Width (mm) Height (mm)

TPS62044DRCR

TPS62046DGQR

TPS62046DRCR

SON

DRC

DGQ

DRC

3000

2500

3000

367.0

370.0

364.0

370.0

367.0

355.0

364.0

355.0

367.0

35.0

55.0

27.0

55.0

35.0

MSOP-PowerPAD

SON

Pack Materials-Page 3

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TPS62046DRCRG4 [TI]

相关型号：

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TPS62050DGSR

TPS62050DGSRG4

TPS62051

TPS62051DGS

TPS62051DGSG4

TPS62051DGSR

TPS62051DGSRG4

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