FP6733S6G [FITIPOWER]

PWM Controlled, Step-up DC/DC Converter in Tiny Package;


型号：	FP6733S6G
厂家：	Fitipower
描述：	PWM Controlled, Step-up DC/DC Converter in Tiny Package
文件：	总11页 (文件大小：704K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

fitipower integrated technology lnc.

FP6733

PWM Controlled, Step-up DC/DC

Converter in Tiny Package

Description

Features

The FP6733 is a high efficiency PWM DC/DC

step-up converter with internal compensated current

mode controller. The output voltage is set by using

 0.9V (Typ.) Low Start-up Input Voltage at 1mA

Load

 High Switching Frequency at 550kHz

two external resistors.

The 550kHz switching

 Provide Flexibility for Using Internal and External

Power Switches

frequency

minimizes the size of external

components. Both internal 1A switch and driver for

driving external power device (NMOS or NPN) are

provided.

 Automatic PFM Mode at Light Load

 Low Ripple and High Efficiency

 Excellent Line/Load Regulation

 Chip Enable Control Function

 Current Limit Protection

 Thermal Overload Protection

 Space Saving Packages: SOT-23-6 and

TSOT-23-6

The FP6733 starts up below 1V input voltage with

1mA load. Due to built-in automatic PWM/PFM

switch-over function, the FP6733 is able to get high

efficiency during both light and heavy load.

External transistor pin is available to accommodate

high output current applications.

Applications

 PDA

The FP6733 is available in SOT-23-6 and

TSOT-23-6 packages.

 MP3

 DSC

 RF Tag

 Wireless Equipment

 Portable Equipment

Pin Assignments

Ordering Information

FP6733□□□

S6 Package (SOT-23-6)

TR: Tape/Reel

VDD LX

G: Green

(Marking)

Package Type

S6: SOT-23-6

S9: TSOT-23-6

CE EXT GND

S9 Package (TSOT-23-6)

SOT-23-6 Marking

Part Number

Product Code

AA=

VDD LX

FP6733S6G

TSOT-23-6 Marking

Part Number

(Marking)

Product Code

aa=

FP6733S9G

CE EXT GND

Figure1. Pin Assignment of FP6733

FP6733-1.6-JUN-2013

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FP6733

Typical Application Circuit

V_IN

V_OUT

3.3~10µH

1N5819

C_OUT

10µF

C_IN

10µF

GND

FP6733

VDD

EXT

Option

OFF

V_IN

V_OUT

3.3~10µH

IN5819

C_OUT

10µF

C_IN

10µF

GND

FP6733

NMOS

VDD

EXT

Option

OFF

Figure 2. Typical Application Circuit of FP6733

Functional Pin Description

Pin Name

Pin Function

EXT

GND

IC chip enable.

External switch transistor driver output.

Ground.

Internal switch MOS output.

IC internal power supply.

VDD

Feedback input pin. Internal reference voltage for error amplifier is 1.25V.

FP6733-1.6-JUN-2013

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FP6733

Block Diagram

Sense

Current

Vref

VDD

Logic &

Buffer

GND

Slope

Compensation

EXT

Chip Enable

Figure 3. Block Diagram of FP6733

Absolute Maximum Ratings

● LX to GND ---------------------------------------------------------------------------------------------------------- +6V

● All Other Pins to GND ------------------------------------------------------------------------------------------- +6V

● Maximum Junction Temperature -----------------------------------------------------------------------------

+150C

● Power Dissipation @T_A=25°C, SOT-23-6, TSOT-23-6 (P_D) -------------------------------------------- +0.40W

● Package Thermal Resistance, SOT-23-6, TSOT-23-6 (θ_JA) ------------------------------------------- +250°C/W

● Storage Temperature Range (T_STG) --------------------------------------------------------------------------

-65C to +150C

● Lead Temperature (Soldering, 10sec.) (T_LEAD) ------------------------------------------------------------ +260°C

Note1：Stresses beyond those listed under “Absolute Maximum Ratings" may cause permanent damage to the device.

Recommended Operating Conditions

● Operating Voltage (V_DD) ---------------------------------------------------------------------------------------- +2.9V to +5.5V

● Operating Temperature Range (T_OPR) -----------------------------------------------------------------------

-40C to +85C

FP6733-1.6-JUN-2013

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FP6733

Electrical Characteristics

(T_A=25C, unless otherwise specified.)

Parameter

Symbol

V_DD

Test Conditions

Normal Operation

Min

Typ

Max

5.5

Units

Operation Voltage

2.9

V_START

I_{NO_LOAD}

I_SWITCH

I_Q

Start-Up Voltage

V_IN: 0→1V, I_OUT=1mA

V_IN=1.5V, V_OUT=3.3V

V_DD=3.3V, V_FB=0V

V_IN=6V

0.9

1.05

No-Load Input Current

Continuous Switching Current

No Switch Current

µA

0.2

0.3

0.4

Shutdown Current

I_SD

VDD=4.5V, CE pin=0V

Close loop, V_DD=3.3V

V_DD=3.3V

0.1

1.25

1.0

µA

V_FB

Feedback Reference Voltage

EXT ON Resistance to V_DD

EXT ON Resistance to GND

LX ON Resistance (Note 2)

Max. Duty Ratio

1.225

1.275

8.5

V_DD=3.3V

8.5

R_DS-ON

DUTY

f_OSC

V_DD=3.3V

0.3

V_DD=3.3V

Oscillator Frequency

LX Leakage Current

Line Regulation

V_DD=3.3V

450

550

0.1

650

1.0

kHz

µA

mV/V

mV/mA

I_LXL

V_LX=6V

ΔV_LINE

ΔV_LOAD

I_LIMIT

V_CEH

V_CEL

I_CEH

V_IN=1.5 ~2.5V, I_L=50mA

V_IN=2.5V, I_L=1~100mA

V_DD=3.3V

Load Regulation

0.15

0.3

Switch Current Limit (Note 2)

CE “High” Voltage

0.75

1.2

V_DD=3.3V, switch ON

V_DD=3.3V, switch OFF

V_DD=3.3V, V_CE=V_DD

V_DD=3.3V, V_CE=0V

CE “Low” Voltage

0.4

0.1

CE “High” Current

µA

I_CEL

CE “Low” Current

-0.1

Efficiency (Note 2)

145

T_SD

ºC

Thermal Shutdown Threshold

(Note 2)

T_SD

Hysteresis

ºC

Note 2：Guarantee by design.

FP6733-1.6-JUN-2013

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FP6733

Typical Performance Curves

Figure 4. Operation Voltage vs. En Pin Trip Level

Figure 5. Operation Voltage vs. EXT NMOS Resistance

Figure 6. Operation Voltage vs. Max Duty

Figure 7. Operation Voltage vs. LX On Resistance

350

300

250

200

150

100

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Input Voltage (V)

Figure 8. Input Voltage vs. Input Current

Figure 9. Operation Voltage vs. Switch Current

FP6733-1.6-JUN-2013

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FP6733

Typical Performance Curves (Continued)

Figure 11. Operation Voltage vs. Frequency

(analog control)

Figure 10. Operation Voltage vs. Quiescent Current

700

VDD3.3V

VDD5.0V

VDD3.3V

VDD5.0V

600

500

400

300

-40

-20

-40

-20

Temperture. (^OC)

Figure 13. Temperature vs. Quiescent Current

Vin=5V, 3LEDs, ILED=100mA, Cout=1μF

Figure 12. Temperature vs. Frequency

1.4

VDD3.3V

VDD5.0V

1.0

0.8

0.6

0.4

0.2

0.0

VDD3.3V

VDD5.0V

1.3

1.2

1.1

1.0

0.9

0.8

-40

-20

Temperture. (^OC)

-40

-20

Temperture. (^OC)

Figure 14. Temperature vs. Switch current

3.3Vi to 3LEDs (PWM control)

Figure 15. Temperature vs. Feedback Voltage

3.3Vi to 4LEDs (PWM control)

FP6733-1.6-JUN-2013

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FP6733

Typical Performance Curves (Continued)

V_IN=4.5V

V_IN=4.0V

V_IN=3.5V

V_IN=3.0V

V =2.5V

V_IN=2.0V^IN

V_IN=1.5V

V_IN=1.0V

V_IN=2.5V

V_IN=2.0V

V_IN=1.0V

V_IN=1.5V

200

400

600

800

1000

1200

-100

100

200

300

400

500

600

700

800

Output current (mA)

Output Current (mA)

Figure 17. Efficiency (V_OUT=5.0V)

(analog control)

Figure 16. Efficiency (V_OUT=3.3V)

5.00

4.98

4.96

4.94

4.92

4.90

4.88

4.86

4.84

4.82

4.80

3.30

3.28

3.26

3.24

3.22

3.20

3.18

3.16

3.14

3.12

3.10

V_IN=1.0V

V_IN=2.0V

V_IN=2.5V

V_IN=3.0V

V_IN=2.5V

V_IN=1.5V

V_IN=2.0V

V_IN=3.5V

V_IN=4.0V

V_IN=4.5V

1200

200

400

600

800

1000

-100

100

200

300

400

500

600

700

800

Output current (mA)

Output Current (mA)

Figure 19. Load Regulation (V_OUT=5.0V)

VIN=5V, 3LEDs, ILED=100mA, COUT=1μF

Figure 18. Load Regulation (V_OUT=3.3V)

FP6733-1.6-JUN-2013

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FP6733

Application Information

Operation

The inductor value can be calculated as:

The FP6733 is designed in a current mode

PFM/PWM scheme which features an automatic

switch PFM/PWM mode to maintain the highest

efficiency and extend battery life. The quiescent

current is less than 25μA at no switching status.

ꢁ

ꢃ

V_IꢈV_ꢀꢁꢂꢂV_Iꢈ

Lꢃ

fꢆꢉI_LꢆV_ꢀꢁꢂ

ꢉI_L: inductor ripple current, usually set 20% x I_L,

which defined as:

The control loop is internally compensated reducing

the amount of external components.

ꢁ

ꢃ

V_ꢀꢁꢂꢊV_Iꢈ

Lꢆf

V_Iꢈ

ꢀ

ꢉI_Lꢃ

V_ꢀꢁꢂ

Chip Enable

The inductor should be rated for the maximum

output current (I_O(MAX)) plus the inductor ripple

current (ꢉI_L) to avoid saturation. The maximum

inductor current (I_L(MAX)) is given by:

The FP6733 features a chip enable input pin that

allows on/off control of the regulator.

When

CE=Low, shutdown of the chip occurs and at that

time almost no quiescent current (<1μA) flows. The

chip enable input is TTL/CMOS compatible.

Connect CE to battery for normal operation.

ꢉI_L

I_{L MAꢋ}_ꢃꢃI_{ꢀ max}_ꢃꢇ

ꢁ

ꢄ

Current Limit Protection

Capacitor Selection

The FP6733 provides cycle-by-cycle over-current

The FP6733 is permissible to use ceramic capacitor

for hand held instrument applications. The value of

capacitor depends on acceptable voltage ripple.

protection.

Current limit is accomplished by

sensing voltage drop across the drain to source of

power switch. If the current sense amplifier output

voltage is larger than current-limited threshold level

(Typ. 1.0A), it will immediately turn off power MOS.

The input capacitor can reduce peak current and

noise at power source. It should be 10μF at least

and be increased for better input voltage filtering.

Select the input capacitor to meet the input ripple

current and voltage rating.

Thermal Protection

Thermal protection limits total power dissipation in

the FP6733.

When the junction temperature

When selecting an output capacitor, consider the

output ripple voltage and the ripple current. The

ESR of capacitor is a major factor to the output

ripple. For best performance, a low ESR output

capacitor is required. The ripple voltage is given

by:

exceeds Tj=145C, the thermal sensor signals the

shutdown logic and turns off most of the internal

circuitry. The thermal sensor will turn internal

circuitry on again after the IC’s junction temperature

drops 30C.

Adjustable Output Voltage

ꢀ

ꢉV_ꢀꢃꢉI_LESRꢇ

ꢌꢆfꢆC_ꢀ

The output voltage of FP6733 ranges from 1.25V to

5.0V which is set by the external feedback resistor.

It can be calculated as:

The common aluminum-electrolytic capacitors have

high ESR and should be avoided. Ceramic

capacitors have the lowest ESR in general. It’s

recommended to use 10μF ceramic output

capacitors for the FP6733.

ꢀ

V_ꢀꢁꢂꢃ1.ꢄꢅꢆ 1ꢇ

Rꢄ

Inductor Selection

Diode Selection

A 3.3μH to 10μH inductor is recommended for

general use. The value of inductor depends on the

For diode selection, both forward voltage and diode

capacitance need to be considered. The output

diode should be rated to the output voltage and

peak switch current. Schottky diodes, with low

forward voltage drop and fast reverse recovery, are

the ideal choices for FP6733 applications. Make

sure the diode’s peak current rating is at least IPK and

operating frequency.

Higher frequency allows

smaller inductor and capacitor but increasing internal

switching loss. Two inductor parameters should be

considered, current rating and DCR. The DCR of

inductor affects the efficiency of the converter. The

inductor with lowest DCR is chosen for highest

efficiency.

its breakdown voltage exceeds V_OUT

FP6733-1.6-JUN-2013

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FP6733

Application Information (Continued)

Layout Consideration

Careful PCB layout is extremely important to avoid

causing parasitical capacitance and line inductance.

The following layout guidelines are recommended to

achieve optimum performance.

 Place the Boost converter diode and inductor

close to the LX pin and no via.

 Place the ceramic bypass capacitors near the V_DD

and GND pin.

 Place C_OUTnext to Schottky diode as possible.

 Use as wide and short traces as possible to the

LX node.

 Keep the noise-sensitive feedback away from the

switching node.

FP6733-1.6-JUN-2013

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FP6733

Outline Information

SOT-23-6 Package (Unit: mm)

DIMENSION IN MILLIMETER

SYMBOLS

UNIT

MIN

0.90

0.00

MAX

1.45

0.15

0.90

0.30

2.80

2.60

1.50

0.90

1.80

0.30

1.30

0.50

3.00

1.70

1.00

2.00

0.60

Note：Followed From JEDEC MO-178-C.

Carrier Dimensions

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FP6733

Outline Information (Continued)

TSOT-23-6 Package (Unit: mm)

DIMENSION IN MILLIMETER

SYMBOLS

UNIT

MIN

MAX

0.70

0.90

0.00

0.70

0.30

2.80

2.60

1.50

0.90

1.80

0.30

0.10

1.00

0.50

3.00

1.70

1.00

2.00

0.60

Carrier Dimensions

Life Support Policy

Fitipower’s products are not authorized for use as critical components in life support devices or other medical systems.

FP6733-1.6-JUN-2013

FP6733S6G [FITIPOWER]

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