FR9801 Datasheet. Www.s Manuals.com. R0.1 Fiti

User Manual: Marking of electronic components, SMD Codes B1, B1*, B1**, B1-, B1-**, B1-***, B10, B10A, B10B, B10C, B10D, B10E, B10F, B10G, B10H, B11, B113ZS, B1237, B1=***, B1G***, B1O, B1Y. Datasheets 1KSMB100A, 1KSMB110A, 1KSMB120A, 1KSMB130A, 1KSMB150A, 1KSMB160A, 1KSMB82A, 1KSMB91A, 2SB1237, BAS40, BD4745G, DTB113ZS, ELM9711NBA, EMB10, EMB11, FR9801S6CTR, IMB10A, IMB11A, KSC2715, RT9010-12GJ6, RT9010-12PJ6, RT9011-GSGQWC, RT9013-33PU5, RT9013A-33GY, RT9014A-PGPQV, RT9169-12GV, RT9169-12PV, RT9169-12PX, RT9903PQV, SS

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1

FR9801-Preliminary 0.1-SEP-2011

FR9801

85T

fitipower integrated technology lnc.

21V, 1.8A, 600KHz Synchronous Step-Down

DC/DC Converter

Pin Assignments

S6 Package (SOT-23-6)

2

13

6 4

5

(Marking)

BST

LX

GND FB

VIN SHDN

Figure 1. Pin Assignment of FR9801

Ordering Information

SOT-23-6 Marking

Part Number

Product Code

FR9801S6CTR

B1G

Description

The FR9801 is a synchronous step-down DC/DC

converter that provides wide 4.5V to 21V input

voltage range and 1.8A continuous load current

capability.

The FR9801 fault protection includes cycle-by-cycle

current limit, UVLO, output overvoltage protection

and thermal shutdown. The adjustable soft-start

function prevents inrush current at turn-on. This

device uses current mode control scheme which

provides fast transient response. Internal

Compensation function reduces external

compensation components and simplifies the design

process. In shutdown mode, the supply current is

less than 1μA.

The FR9801 is available in a SOT-23-6 package,

provides good thermal conductance.

Features

● High Efficiency up to 94%

● Low Rds(on) Integrated Power MOSFET

● Internal Compensation Function

● Wide Input Voltage Range: 4.5V to 21V

● Adjustable Output Voltage from 0.8V to 17.85V

● 1.8A Output Current

● Fixed 600KHz Switching Frequency

● Current Mode Operation

● Cycle-by-Cycle Current Limit

● Over-Temperature Protection with Auto Recovery

● Output Overvoltage Protection

● Under Voltage Lockout

● <1μA Shutdown Current

● SOT-23-6 Package

Applications

● STB (Set-Top-Box)

● LCD Displays, TVs

● Distributed Power Systems

● Networking, XDSL Modems

C: Green

TR: Tape / Reel

FR9801□□□

Package Type

S6: SOT-23-6

2

FR9801-Preliminary 0.1-SEP-2011

FR9801

85T

fitipower integrated technology lnc.

Typical Application Circuit

FR9801

GND

VIN

BST

FB

LX

VIN

4.5V to 21V

VOUT

10μF/25V

CERAMIC x 2 22μF/6.3V

CERAMIC x 2

L1

4.7μH

R2

R1

R3

100kΩ

1

56

2

3

4

C4

C1 C2

C3

0.1μF

SHDN

3.3V

9.76kΩ 1%

30.9kΩ 1% (optional)

Figure 2. CIN /COUT use Ceramic Capacitors Application Circuit

FR9801

GND

VIN

BST

FB

LX

VIN

4.5V to 21V

VOUT

0.1μF/25V

CERAMIC x 1

100μF/6.3V

EC x 1

R2

R1

1

56

2

3

4

C1 C2

100μF/25V

EC x 1

C4

L1

4.7μH

C3

0.1μF

R3

100kΩ

SHDN

3.3V

30.9kΩ 1%

9.76kΩ 1%

Figure 3. CIN /COUT use Electrolytic Capacitors Application Circuit

VOUT

R1

R2

C4

L1

COUT

1.2V

4.99kΩ

10kΩ

10pF~1nF

2.2μH

22μF MLCC x2

1.8V

4.99kΩ

3.92kΩ

10pF~1nF

2.2μH

22μF MLCC x2

2.5V

4.99kΩ

2.32kΩ

10pF~1nF

4.7μH

22μF MLCC x2

3.3V

30.9kΩ

9.76kΩ

10pF~1nF

4.7μH

22μF MLCC x2

5V

30.9kΩ

5.76kΩ

10pF~1nF

4.7μH

22μF MLCC x2

1.2V

4.99kΩ

10kΩ

--

2.2μH

100μF EC x1

1.8V

4.99kΩ

3.92kΩ

--

2.2μH

100μF EC x1

2.5V

4.99kΩ

2.32kΩ

--

4.7μH

100μF EC x1

3.3V

30.9kΩ

9.76kΩ

--

4.7μH

100μF EC x1

5V

30.9kΩ

5.76kΩ

--

4.7μH

100μF EC x1

Table 1. Recommended Component Values

3

FR9801-Preliminary 0.1-SEP-2011

FR9801

85T

fitipower integrated technology lnc.

Functional Pin Description

I/O

Pin Name

Pin No.

Pin Function

I

FB

3

Voltage Feedback Input Pin. Connect FB and VOUT with a resistive voltage

divider. This IC senses feedback voltage via FB and regulates it at 0.8V.

I

VIN

5

Power Supply Input Pin. Drive VIN pin by 4.5V to 21V voltage to power on

the chip.

I

SHDN

4

Enable Input Pin. This pin is a digital control input that turns the converter on

or off. Connect to VIN with a 100KΩ resistor for self-startup.

I

GND

2

Ground Pin.

O

LX

6

Power Switching Output. LX is the output of the internal high side NMOS

switch.

O

BST

1

High Side Gate Drive Boost Pin. A 10nF or greater capacitor must be

connected from this pin to LX. It can boost the gate drive to fully turn on the

internal high side NMOS.

Block Diagram

PWM

Control

Driver

Logic

BST

LX

R

OTP

OVP

UVLO

Current

Comp

S

Oscillator

High-Side

MOSFET

Low-Side

MOSFET

ISEN

FB

0.8V

UVLO

&

POR

VIN

VCC

GND

Current

Limit

OTP

Internal

Regulator

VCC

OVP

1M

SHDN

Figure 4. Block Diagram of FR9801

4

FR9801-Preliminary 0.1-SEP-2011

FR9801

85T

fitipower integrated technology lnc.

Absolute Maximum Ratings (Note 1)

● Supply Voltage VIN -------------------------------------------------------------------------------------------

-0.3V to +23V

● Enable Voltage V

SHDN

--------------------------------------------------------------------------------------

-0.3V to +23V

● LX Voltage VLX (50ns) --------------------------------------------------------------------------------------

-1V to VIN+0.3V

● BST Pin Voltage VBST --------------------------------------------------------------------------------------

VLX-0.3V to VLX+6V

● All Other Pins Voltage -------------------------------------------------------------------------------------

-0.3V to +6V

● Maximum Junction Temperature (TJ) ------------------------------------------------------------------

+150°C

● Storage Temperature (TS) --------------------------------------------------------------------------------

-65°C to +150°C

● Lead Temperature (Soldering, 10sec.) ----------------------------------------------------------------

+260°C

● Power Dissipation @TA=25°C, (PD)

SOT-23-6 --------------------------------------------------------------------------------------------

+0.40W

● Package Thermal Resistance, (θJA):

SOT-23-6 --------------------------------------------------------------------------------------------

+250°C/W

● Package Thermal Resistance, (θJC):

SOT-23-6 --------------------------------------------------------------------------------------------

+130°C/W

Note 1：Stresses beyond this listed under “Absolute Maximum Ratings" may cause permanent damage to the device.

Recommended Operating Conditions

● Supply Voltage VIN -------------------------------------------------------------------------------------------

+4.5V to +21V

● Enable Voltage V

SHDN

--------------------------------------------------------------------------------------

0V to VIN

● Operation Temperature Range --------------------------------------------------------------------------

-40°C to +85°C

5

FR9801-Preliminary 0.1-SEP-2011

FR9801

85T

fitipower integrated technology lnc.

Electrical Characteristics

(VIN=12V, TA=25°C, unless otherwise specified.)

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

VIN Input Supply Voltage

VIN

4.5

21

V

VIN Quiescent Current

IDDQ

V

SHDN

=1.8V, VFB=1.0V

2.5

mA

VIN Shutdown Supply Current

ISD

V

SHDN

=0V

1

μA

Feedback Voltage

VFB

4.5V≦VIN≦21V

0.779

0.8

0.821

V

Feedback OVP Threshold Voltage

VOVP

1.4

V

High-Side MOSFET RDS(ON)

(Note 2)

RDS(ON)

120

mΩ

Low-Side MOSFET RDS(ON)

(Note 2)

RDS(ON)

110

mΩ

High-Side MOSFET Leakage

Current

ILX(leak)

V

SHDN

=0V, VLX=0V

10

μA

High-Side MOSFET Current Limit

(Note 2)

ILIMIT(HS)

Minimum Duty

2.5

3

A

Low-Side MOSFET Current Limit

(Note 2)

ILIMIT(LS)

From Drain to Source

1.5

A

Error Amplifier Voltage Gain

(Note 2)

400

V/V

Oscillation frequency

FOSC

480

600

720

KHz

Short Circuit Oscillation Frequency

FOSC(short)

VFB=0V

140

KHz

Maximum Duty Cycle

DMAX

VFB=0.6V

90

%

Minimum On Time (Note 2)

TMIN

100

ns

Input UVLO Threshold

VUVLO(Vth)

VIN Rising

4.3

V

Under Voltage Lockout Threshold

Hysteresis

VUVLO(HYS)

400

mV

SHDN

Input Low Voltage

V

SHDN

(L)

0.4

V

SHDN

Input High Voltage

V

SHDN

(H)

2

V

SHDN

Input Current

I

SHDN

VIN =2V

2

μA

Thermal Shutdown Threshold

(Note 2)

TSD

170

°C

Note 2：Not production tested.

6

FR9801-Preliminary 0.1-SEP-2011

FR9801

85T

fitipower integrated technology lnc.

Outline Information

SOT-23-6 Package (Unit: mm)

SYMBOLS

UNIT

DIMENSION IN MILLIMEER

MIN

MAX

A

0.90

1.45

A1

0.00

0.15

A2

0.90

1.30

B

0.30

0.50

D

2.80

3.00

E

2.60

3.00

E1

1.50

1.70

e

0.90

1.00

e1

1.80

2.00

L

0.30

0.60

Note：Followed From JEDEC MO-178-C.

Carrier dimensions

Life Support Policy

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

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