Datasheet FR9801S6CTR Datasheet (Fiti) [ru]

1

FR9801-Preliminary 0.1-SEP-2011

FR9801

fitipower integrated technology lnc.

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

DC/DC Converter

Pin Assignments

S6 Package (SOT-23-6)

2

1

3

6 4

5

(Marking)

BSTLXGND

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

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FR9801-Preliminary 0.1-SEP-2011

FR9801

fitipower integrated technology lnc.

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

5

6

2

3

4

C4

C1

C2

C3

0.1μF

SHDN

3.3V

9.76kΩ 1%

30.9kΩ 1%

(optional)

Figure 2. C

IN /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

5

6

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. C

IN /COUT

use Electrolytic Capacitors Application Circuit

V

OUT

R1

R2

C4

L1

C

OUT

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

Typical Application Circuit

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FR9801-Preliminary 0.1-SEP-2011

FR9801

fitipower integrated technology lnc.

I/O

Pin Name

Pin No.

Pin Function

I

FB

3

Voltage Feedback Input Pin. Connect FB and V

OUT

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.

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

Functional Pin Description

Block Diagram

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FR9801-Preliminary 0.1-SEP-2011

FR9801

fitipower integrated technology lnc.

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

-0.3V to +23V

● Enable Voltage V

SHDN

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

-0.3V to +23V

● LX Voltage V

LX

(50ns) --------------------------------------------------------------------------------------

-1V to VIN+0.3V

● BST Pin Voltage V

BST

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

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, (θ

JA

):

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

+250°C/W

● Package Thermal Resistance, (θ

JC

):

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

+130°C/W

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

+4.5V to +21V

● Enable Voltage V

SHDN

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

0V to VIN

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

-40°C to +85°C

Absolute Maximum Ratings (Note 1)

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

Recommended Operating Conditions

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FR9801-Preliminary 0.1-SEP-2011

FR9801

fitipower integrated technology lnc.

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

VIN Input Supply Voltage

VIN 4.5 21

V

VIN Quiescent Current

I

DDQ

V

SHDN

=1.8V, VFB=1.0V

2.5 mA

V

IN

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

V

OVP

1.4 V

High-Side MOSFET RDS(ON)
(Note 2)

R

DS(ON)

120 mΩ

Low-Side MOSFET RDS(ON)
(Note 2)

R

DS(ON)

110 mΩ

High-Side MOSFET Leakage
Current

I

LX(leak)

V

SHDN

=0V, VLX=0V

10

μA

High-Side MOSFET Current Limit
(Note 2)

I

LIMIT(HS)

Minimum Duty

2.5 3

A

Low-Side MOSFET Current Limit
(Note 2)

I

LIMIT(LS)

From Drain to Source

1.5

A

Error Amplifier Voltage Gain
(Note 2)

400 V/V

Oscillation frequency

F

OSC

480

600

720

KHz

Short Circuit Oscillation Frequency

F

OSC(short)

VFB=0V

140 KHz

Maximum Duty Cycle

D

MAX

VFB=0.6V

90 %

Minimum On Time (Note 2)

T

MIN

100 ns

Input UVLO Threshold

V

UVLO(Vth)

VIN Rising

4.3 V

Under Voltage Lockout Threshold
Hysteresis

V

UVLO(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

Electrical Characteristics

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

Note 2：Not production tested.

6

FR9801-Preliminary 0.1-SEP-2011

FR9801

fitipower integrated technology lnc.

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

Outline Information

Life Support Policy

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