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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FR9801

fitipower integrated technology lnc.

85T
21V, 1.8A, 600KHz Synchronous Step-Down
DC/DC Converter
Description

Features

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.

● 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

Pin Assignments

Ordering Information

S6 Package (SOT-23-6)

FR9801□□□
TR: Tape / Reel

LX VIN SHDN

C: Green
6
1

4
5
(Marking)
2

Package Type
S6: SOT-23-6

3

BST GND FB

Figure 1. Pin Assignment of FR9801
SOT-23-6 Marking

FR9801-Preliminary 0.1-SEP-2011

Part Number

Product Code

FR9801S6CTR

B1G

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FR9801

fitipower integrated technology lnc.

85T

Typical Application Circuit
C3
0.1μF

R3
100kΩ

4

1

SHDN
5

VIN

L1
4.7μH

BST
LX 6

VIN

VOUT
3.3V

4.5V to 21V
C1
10μF/25V
CERAMIC x 2

FR9801
FB

3

GND
2

R1
30.9kΩ 1%

C4
(optional)

C2
22μF/6.3V
CERAMIC x 2

R2
9.76kΩ 1%

Figure 2. CIN /COUT use Ceramic Capacitors Application Circuit
C3
0.1μF

R3
100kΩ

4

1

SHDN
5

VIN

L1
4.7μH

BST
LX

VIN

6

VOUT
3.3V

4.5V to 21V
C1
100μF/25V
EC x 1

C4
0.1μF/25V
CERAMIC x 1

FR9801
FB
GND
2

3

C2
100μF/6.3V
EC x 1

R1
30.9kΩ 1%

R2
9.76kΩ 1%

Figure 3. CIN /COUT use Electrolytic Capacitors Application Circuit
VOUT
1.2V
1.8V
2.5V
3.3V
5V
1.2V
1.8V
2.5V
3.3V
5V

R1
4.99kΩ
4.99kΩ
4.99kΩ
30.9kΩ
30.9kΩ
4.99kΩ
4.99kΩ
4.99kΩ
30.9kΩ
30.9kΩ

R2
10kΩ
3.92kΩ
2.32kΩ
9.76kΩ
5.76kΩ
10kΩ
3.92kΩ
2.32kΩ
9.76kΩ
5.76kΩ

C4
10pF~1nF
10pF~1nF
10pF~1nF
10pF~1nF
10pF~1nF
------

L1
2.2μH
2.2μH
4.7μH
4.7μH
4.7μH
2.2μH
2.2μH
4.7μH
4.7μH
4.7μH

COUT
22μF MLCC x2
22μF MLCC x2
22μF MLCC x2
22μF MLCC x2
22μF MLCC x2
100μF EC x1
100μF EC x1
100μF EC x1
100μF EC x1
100μF EC x1

Table 1. Recommended Component Values
FR9801-Preliminary 0.1-SEP-2011

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FR9801

fitipower integrated technology lnc.

85T

Functional Pin Description
I/O

Pin Name

Pin No.

I

FB

3

I

VIN

5

I

SHDN

4

I

GND

2

O

LX

6

O

BST

1

Pin Function
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.
Power Supply Input Pin. Drive VIN pin by 4.5V to 21V voltage to power on
the chip.
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.
Ground Pin.
Power Switching Output. LX is the output of the internal high side NMOS
switch.
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
VIN

UVLO
&
POR

SHDN

ISEN

Internal
Regulator

VCC

OTP
VCC

1M
OVP
Oscillator
BST

High-Side
MOSFET

S
FB

Current
Comp

R
OTP
OVP
UVLO

PWM
Control

Driver
Logic

LX

Low-Side
MOSFET

0.8V
Current
Limit

GND

Figure 4. Block Diagram of FR9801

FR9801-Preliminary 0.1-SEP-2011

3

fitipower integrated technology lnc.

FR9801

Absolute Maximum Ratings (Note 1)

85T

● Supply Voltage VIN ------------------------------------------------------------------------------------------- -0.3V to +23V
● Enable Voltage VSHDN -------------------------------------------------------------------------------------- -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 VSHDN -------------------------------------------------------------------------------------- 0V to VIN
● Operation Temperature Range -------------------------------------------------------------------------- -40°C to +85°C

FR9801-Preliminary 0.1-SEP-2011

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FR9801

fitipower integrated technology lnc.

85T

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

Symbol

Conditions

VIN Input Supply Voltage

VIN

VIN Quiescent Current

IDDQ

VSHDN =1.8V, VFB=1.0V

VIN Shutdown Supply Current

ISD

VSHDN =0V

Feedback Voltage

VFB

4.5V≦VIN≦21V

Feedback OVP Threshold Voltage
High-Side MOSFET RDS(ON)
(Note 2)
Low-Side MOSFET RDS(ON)
(Note 2)
High-Side MOSFET Leakage
Current
High-Side MOSFET Current Limit
(Note 2)
Low-Side MOSFET Current Limit
(Note 2)
Error Amplifier Voltage Gain
(Note 2)
Oscillation frequency
Short Circuit Oscillation Frequency

Max

Unit

21

V

2.5

0.779

0.8

mA
1

μA

0.821

V

VOVP

1.4

V

RDS(ON)

120

mΩ

RDS(ON)

110

mΩ

ILX(leak)

VSHDN =0V, VLX=0V

ILIMIT(HS)

Minimum Duty

ILIMIT(LS)

From Drain to Source

FOSC
FOSC(short)
DMAX

Minimum On Time (Note 2)

TMIN

Input UVLO Threshold

VUVLO(Vth)

Under Voltage Lockout Threshold
Hysteresis

VUVLO(HYS)

SHDN Input Low Voltage

VSHDN

(L)

SHDN Input High Voltage

VSHDN

(H)

Thermal Shutdown Threshold
(Note 2)

Typ

4.5

Maximum Duty Cycle

SHDN Input Current

Min

ISHDN
TSD

10
2.5

480

μA

3

A

1.5

A

400

V/V

600

720

KHz

VFB=0V

140

KHz

VFB=0.6V

90

%

100

ns

4.3

V

400

mV

VIN Rising

0.4
2
VIN =2V

V
V

2

μA

170

°C

Note 2：Not production tested.

FR9801-Preliminary 0.1-SEP-2011

5

FR9801

fitipower integrated technology lnc.

85T
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.
FR9801-Preliminary 0.1-SEP-2011

6

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