FP6770S9P [FITIPOWER]

Low Noise, DC/DC Charge Pump Regulator;


型号：	FP6770S9P
厂家：	Fitipower
描述：	Low Noise, DC/DC Charge Pump Regulator
文件：	总9页 (文件大小：602K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

fitipower integrated technology lnc.

FP6770

Low Noise, DC/DC

Charge Pump Regulator

Description

Features

The FP6770 is a low noise DC/DC charge pump

regulator that produces a regulated output voltage

from 2.7V to 5V input voltage. Low external parts

count (one flying capacitor and two small bypass

capacitors at V_INand V_OUT) make the FP6770 ideal

for small, battery-powered applications.

● Low Noise Constant Frequency Operation

● Output Current: Minimum 170mA at V_IN=3.2V

● Available in SOT-23-6 、TSOT-23-6 and TDFN-6

● 2MHz Switching Frequency

● Fixed 5V ± 4% Output

● V_INRange: 2.7V to 5V

● No Inductors

● Low Shutdown Current: <1μA

The FP6770 operates as a constant frequency mode

switched capacitor voltage doubler to produce a

regulated output and reduces both output and input

ripple. The FP6770 has both short circuit protection

and thermal shutdown capability.

Applications

● White LEDs Backlighting

● Li-Ion Battery Backup Supply

● Smart Card Reader

The FP6770 is available in space-saving SOT-23-6

TSOT-23-6 and TDFN-6 packages.

● Local 3V to 5V Conversion

● PCMCIA Local 5V Supply

Pin Assignments

Ordering Information

FP6770□□□

S6 Package (SOT-23-6)

TR: Tape / Reel

C-

C+ VIN

P: Green

G: Green

(Marking)

Package Type

S6: SOT-23-6

S9: TSOT-23-6

VOUT GND

SHDN

WD: TDFN-6 (1.6x1.6mm)

S9 Package (TSOT-23-6)

C-

C+ VIN

SOT-23-6 Marking

(Marking)

Part Number

Product Code

FP6770S6P

TSOT-23-6 Marking

VOUT GND

SHDN

WD Package (TDFN- 6) (1.6x1.6mm)

Part Number

Product Code

FP6770S9P

C+

VIN

C-

VOUT

GND

TDFN-6(1.6x1.6mm) Marking

Part Number

Product Code

FP6770WDG

SHDN

Figure 1. Pin Assignment of FP6770

FP6770-1.5-OCT-2011

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FP6770

Typical Application Circuit

V_OUT

V_IN

FP6770

VOUT

C+

1-Cell

Li-ion Battery

C_IN

1µF

C_OUT

1µF

GND

VIN

C_FLY

1µF

SHDN

Figure 2. Typical Application Circuit of FP6770

Functional Pin Description

Pin Name

Pin Function

Regulated output voltage. For best performance, V_OUTshould be bypassed with a 1μF (min.) low ESR capacitor

as close as possible to the pin.

VOUT

GND

Ground. Should be tied to a ground plane for best performance.

Active low shutdown input. A low voltage on

Flying capacitor negative terminal.

disables the FP6770.

is not allowed to float.

SHDN

C-

VIN

C+

Input supply voltage. V_INshould be bypassed with a 1μF (min.) low ESR capacitor.

Flying capacitor positive terminal.

Block Diagram

V_IN

C_IN

VOUT

C+

C_OUT

C_FLY

Control

COMP

VREF

SHDN

Figure 3. Block Diagram of FP6770

FP6770-1.5-OCT-2011

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FP6770

Absolute Maximum Ratings

● V_INto GND --------------------------------------------------------------------------------------------------------- +6V

● V_OUTto GND ------------------------------------------------------------------------------------------------------- +6V

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

● Power Dissipation (P_D) @ T_A=25℃:

SOT-23-6 / TSOT-23-6 -------------------------------------------------------------------------- 0.4W

TDFN-6 (1.6mX1.6m)(P_D) ---------------------------------------------------------------------- 1.25W

● Package Thermal Resistance:

SOT-23-6 / TSOT-23-6 (θ_JA) ------------------------------------------------------------------- 250°C/W

TDFN-6 (1.6mX1.6m) ---------------------------------------------------------------------------

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

● Storage Temperature Range ----------------------------------------------------------------------------------

80℃/W

+150C

-65C to +150C

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

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

Recommended Operating Conditions

● Supply Voltage (V_IN) --------------------------------------------------------------------------------------------- +2.7V to +5V

● Operation Temperature Range -------------------------------------------------------------------------------- -40°C to +85°C

Electrical Characteristics

(T_A=25C, C_FLY=1μF, C_IN=1μF, C_OUT=1μF, unless otherwise specified.)

Parameter

Input Voltage

Symbol

Conditions

Min

2.7

4.8

100

Typ

Max

Unit

V_IN

5.2

2.7V V_IN< 5V, I_OUT 60mA

3.0V V_IN 5V, I_OUT 120mA

V_OUT

Output Voltage

I_OUT

I_CC

Continuous Output Current

Supply Current

V_IN=3.0V, V_OUT=5.0V, SHDN =V_IN

2.7V V_IN 5.0V, I_OUT=0,

SHDN =V_IN

4.5

1.0

2.7V V_IN 5.0V, I_OUT=0,

SHDN =0V

I_SHDN

Shutdown Current

0.01

μA



Efficiency

V_IN=2.7V, I_OUT=60mA

Oscillator Free Running

V_IN=3.0V, output on

V_IN=3.0V, output off

MHz

f_OSC

V_IH

Switching Frequency

1.4

Input Threshold

Leakage Current

SHDN

V_IL

I_IH

0.3

-1

μA

μS

SHDN =V_IN

I_IL

SHDN = 0V

t_ON

I_SC

V_OUTTurn On Time

V_IN=3V, I_OUT= 1mA

200

300

Output Short Circuit Current

V_IN=3V, V_OUT= 0V, SHDN =V_IN

FP6770-1.5-OCT-2011

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FP6770

Typical Performance Curves

5.4

5.3

5.2

5.1

5.0

4.9

4.8

4.7

4.6

5.10

5.05

5.00

4.95

4.90

4.85

4.80

4.75

4.70

C_IN=C_OUT=C_FLY=1F

T_A=20^OC

I_OUT=20mA

T_A=-45^OC

V_IN=3.2V

V_IN=2.9V

T_A=20^OC

T_A=85^OC

V_IN=2.7V

5.0

2.7

3.0

3.3

3.6

3.9

4.2

4.5

4.8

100

120

140

160

Supply Voltage (V)

Output Current (mA)

Figure 4. Output Voltage vs. Supply Voltage

Figure 5. Output Voltage vs. Load Current

3.50

3.25

3.00

2.75

2.50

2.25

2.00

2.20

2.15

2.10

2.05

2.00

1.95

1.90

1.85

1.80

C_IN=C_OUT=C_FLY=1F

V_SHDN=V_IN

T_A=20^OC

T_A=-45^OC

T_A=20^OC

T_A=-45^OC

T_A=85^OC

2.7

3.0

3.3

3.6

3.9

4.2

4.5

4.8

5.0

2.7

3.0

3.3

3.6

3.9

4.2

4.5

4.8

5.0

Supply Voltage (V)

Figure 6. No Load Supply Current vs. Supply Voltage

Figure 7. Oscillator Frequency vs. Supply Voltage

500

1.7

C_IN=C_OUT=C_FLY=1F

T_A=-45^OC

1.6

V_SHDN=V_IN

400

T_A=20^OC

1.5

1.4

T_A=85^OC

300

200

100

1.3

1.2

1.1

1.0

0.9

2.7

3.0

3.3

3.6

3.9

4.2

4.5

4.8

5.0

2.7

3.0

3.3

3.6

3.9

4.2

4.5

4.8

5.0

Supply Voltage (V)

Figure 8. VSHDN Threshold Voltage vs. Supply Voltage

Figure 9. Short Circuit Current vs. Supply Voltage

FP6770-1.5-OCT-2011

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FP6770

Typical Performance Curves (Continued)

100

V_IN=2.7V

C_IN=C_OUT=C_FLY=1F

T_A=25^OC

V_IN=3.2V

V_IN=3.7V

V_IN=5.0V

100

100μs/div

Load Current (mA)

Figure 10. Efficiency vs. Load Current

Figure 11. Output Voltage Start Up

FP6770-1.5-OCT-2011

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FP6770

Application Information

Introduction

The FP6770 is a DC/DC charge pump converter that

produces a regulated 5V output with an input voltage

Shutdown

The output is disconnected from input when

pin is tied to GND. In shutdown mode, most circuit

is turned off and the input current gets extremely

SHDN

that range from 2.7V to 5V. It boosts V to get a

low. Due to high impedance,

floated.

pin can’t be

SHDN

regulated output voltage using the charge pump

topology. Sensing the output voltage through an

internal resistor divider. When the output voltage is

lower, the internal comparator will increase charge

pump ability, and vice versa. When the charge pump

is enabled, a two-phase non-overlapping clock

activates the charge pump switches.

External Capacitor Selection

Three external capacitors determine FP6770

performances, in the aspects of output ripple

voltage, charge pump strength and transient.

Optimum performance can be obtained by the use of

ceramic capacitors with low ESR.

Efficiency

Let’s take advantage of conversation of charge for

flying capacitor. Assume that the flying capacitor

has reached its steady state.

Because a low ESR ceramic capacitor can reduce

noise and ripple, ceramic capacitor is recommended

for C_INand C_OUT

amount of output ripple voltage.

The value of C_OUTdetermines the

An output

capacitor with larger value results in smaller ripple.

C_FLYdetermine the strength of charge pump. The

larger C_FLYmeans that the larger output current and

larger ripple voltage on V_OUTpin. However, large

C_INand C_OUTare expected when a large C_FLY

applies. The value of capacitors, which is used

under operation condition, determines the

performance of a charge pump converter. And two

factors, as follows, affect the capacitance of

capacitor.

I_ON-AVE I_OFF-AVE

(1)

According to the equation (1), the input current is

twice the output current.

 I

 I

OFF AVE

ONAVE

OFF AVE

OUT

 2I

There are many kinds of Ceramic capacitors

materials, such as X7R, X5R, Z5U and Y5V. There

have different ESR, tolerance in temperature and

differnet cpacitance loss

For example, a X7R or X5R type of capacitor can

retain most of the capacitance at temperature from

-40C to 85C, but a Z5U or Y5V type will lose most

of the capacitance at that temperature range.

The efficiency of charge pump is given below:

V_OUTI_OUT

V_OUT



I

 2I_OUT

IN IN

Short Circuit/Thermal Protection

FP6770 have a built-in short circuit current limiting

and an over temperature protection. During the

short circuit condition, the output current is

automatically limited at approximately 300mA on

V_IN=3V. When the die temperature exceeds 160C,

the thermal protection will shut the charge pump

switching operation down and the die temperature

will reduce afterwards. When the die temperature

drops below 135C, the charge pump switching

circuit will restart. If the fault doesn’t eliminate, the

above protecting operation will repeat again and

again. It allows FP6770 to continuously work at

short circuit condition without damaging the device.

Layout Considerations

Because the high frequency and high transient

current of FP6770, careful consideration of PCB

layout.

Minimize the distance between every

It also

component, C_FLYand C_OUTespecially.

minimizes every connection length with a maximum

trace width to achieve the best performance of

FP6770. Make sure each device connects to

immediate ground plane.

FP6770-1.5-OCT-2011

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FP6770

Outline Information

TSOT-23-6 Package (Unit: mm)

DIMENSION IN MILLIMETER

SYMBOLS

UNIT

MIN

MAX

0.70

1.10

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

FP6770-1.5-OCT-2011

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FP6770

Outline Information (Continued)

SOT-23-6 Package (Unit: mm)

DIMENSION IN MILLIMETER

SYMBOLS

UNIT

MIN

0.90

0.00

0.90

0.30

2.80

2.60

1.50

0.90

1.80

0.30

MAX

1.45

0.15

1.30

0.50

3.00

1.70

1.00

2.00

0.60

Note：Followed From JEDEC MO-178-C.

Carrier dimensions

FP6770-1.5-OCT-2011

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FP6770

Outline Information (Continued)

TDFN-6 1.6mm×1.6mm (pitch 0.5mm) Package (Unit: mm)

DIMENSION IN MILLIMETER

SYMBOLS

UNIT

MIN

0.70

0.00

0.18

1.55

0.18

0.45

0.95

0.55

MAX

0.80

0.05

0.25

1.65

0.30

0.55

1.05

0.65

Carrier dimensions

Life Support Policy

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

FP6770-1.5-OCT-2011

FP6770S9P [FITIPOWER]

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