ETC FP6298

FP6298
Low-Noise 4.5A Step-Up Current Mode PWM Converter
General Description
The FP6298 is a current mode boost DC-DC converter. It is PWM circuitry with built-in 0.08Ω
power MOSFET make this regulator highly power efficient. The internal compensation network also
minimizes as much as 6 external component counts. The non-inverting input of error amplifier connects
to a 0.6V precision reference voltage and internal soft-start function can reduce the inrush current.
The FP6298 is available in the SOP-8L(EP) package and provides space-saving PCB for the
application fields.
Features
 Adjustable Output up to 9V
 Internal Fixed PWM frequency: 500KHz
 Precision Feedback Reference Voltage: 0.6V (±2%)
 Internal 0.08Ω, 4.5A, 12V Power MOSFET
 Shutdown Current: 0.1μA
 Over Temperature Protection
 Over Voltage Protection
 Adjustable Over Current Protection: 0.5A ~ 4.5A
 Package: SOP-8L(EP)
Applications
 Chargers
 LCD Displays
 Digital Cameras
 Handheld Devices
 Portable Products
Typical Application Circuit
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.63
Website: http://www.feeling-tech.com.tw
1/10
FP6298
Function Block Diagram
Pin Descriptions
SOP-8L(EP)
Name
No. I / O
Description
PGND
1
P
IC Ground
OC
2
I
Adjustable Current Limit (Floating Available)
Vcc
3
P
IC Power Supply
EN
4
I
Enable Control (Active High)
GND
5
P
IC Ground
FB
6
I
Error Amplifier Inverting Input
NC
7
NA
LX
8
O
Power Switch Output
EP
9
P
Exposed PAD (Must connect to Ground)
Not Connected
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.63
Website: http://www.feeling-tech.com.tw
2/10
FP6298
Marking Information
SOP-8L(EP)
Halogen Free: Halogen free product indicator.
Lot Number: Wafer lot number’s last two digits.
For Example: 132386TB  86
Internal ID: Internal Identification Code.
Per-Half Month: Production period indicated in half month time unit.
For Example: JanuaryA(Front Half Month),B(Last Half Month)
FebruaryC(Front Half Month),D(Last Half Month)
Year: Production year’s last digit
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.63
Website: http://www.feeling-tech.com.tw
3/10
FP6298
Ordering Information
Part Number
Operating Temperature
Package
MOQ
Description
-40°C ~ 85°C
SOP-8L(EP)
2500EA
Tape & Reel
FP6298XR-G1
Absolute Maximum Ratings
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Supply Voltage
VCC
0
6
V
LX Voltage
VLX
0
12
V
0
6
V
+83
°C / W
+150
°C
EN,FB Voltage
Thermal Resistance (Note1)
θJA
Junction Temperature
TJ
SOP-8L(EP)
Operating Temperature
TOP
-40
+85
°C
Storage Temperature
TST
-65
+150
°C
+260
°C
Lead Temperature
(soldering, 10 sec)
Note1:
θJA is measured in the natural convection at TA=25°C on a low effective thermal conductivity test
board of JEDEC 51-3 thermal measurement standard.
IR Re-flow Soldering Curve
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.63
Website: http://www.feeling-tech.com.tw
4/10
FP6298
Recommended Operating Conditions
Parameter
Symbol
Supply Voltage
VIN
Operating Temperature Range
TA
Conditions
Ambient Temperature
Min.
Max.
Unit
2.6
Typ.
5.5
V
-40
+85
°C
DC Electrical Characteristics (VCC=3.3V, TA=25°C, unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
5.5
V
System Supply Input
Input Supply Range
VCC
Under Voltage Lockout
2.6
VUVLO
UVLO Hysteresis
2.2
V
0.1
V
Quiescent Current
ICC
VFB=0.66V, No switching
0.2
mA
Average Supply Current
ICC
VFB=0.55V, Switching
6.5
mA
Shutdown Supply Current
ICC
VEN=GND
0.1
µA
Oscillator
Operation Frequency
Frequency Change with Voltage
FOSC
400
△f / △V VCC=2.6V to 5.5V
Maximum Duty Cycle
TDUTY
500
600
KHZ
5
%
90
%
Reference Voltage
VREF
Reference Voltage
Line Regulation
0.588
0.6
0.612
0.2
VCC=2.6V～5.5V
V
%/V
Enable Control
Enable Voltage
VEN
Shutdown Voltage
VEN
0.96
V
0.6
V
MOSFET
On Resistance of Driver
RDS (ON) ILX=2A
0.08
Ω
4.5
A
Protection
OCP Current
IOCP
Adjustable OCP Current
IOCP
OTP Temperature
TOTP
With External Resistor：
26k~500k
4.5
0.5
+150
A
°C
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.63
Website: http://www.feeling-tech.com.tw
5/10
FP6298
Function Description
Operation
The FP6298 is a current mode boost converter. The switching frequency is 500KHz and operates
with pulse width modulation (PWM). Build-in 12V / 4.5A MOSFET provides a high output voltage. The
control loop architecture is peak current mode control; therefore slope compensation circuit is added to
the current signal to allow stable operation for duty cycles larger than 50%.
Soft Start Function
Soft start circuitry is integrated into FP6298 to avoid inrush current during power on. After the IC
is enabled, the output of error amplifier is clamped by the internal soft-start function, which causes
PWM pulse width increasing slowly and thus reducing input surge current.
Current Limit Program
A resistor between OC and GND pin programs peak switch current. The resistor value should be
between 26k to 500k. The current limit will be set from 4.5A to 0.5A. Keep traces at this pin as short as
possible. Do not put capacitance at this pin. To set the over current trip point according to the following
equation:
IOCP =
110000
+ 0 .3
R3
Over Temperature Protection (OTP)
FP6298 will turn off the power MOSFET automatically when the internal junction temperature is
over 150°C. The power MOSFET wake up when the junction temperature drops 30°C under the OTP
threshold temperature.
Over Voltage Protection (OVP)
In some condition, the resistive divider may be unconnected, which will cause PWM signal to
operate with maximum duty cycle and output voltage is boosted higher and higher. The power
MOSFET will be turned off immediately, when the output voltage exceeds the OVP threshold level. The
FP6298’s OVP threshold is 12V.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.63
Website: http://www.feeling-tech.com.tw
6/10
FP6298
Application Information
Inductor Selection
Inductance value is decided based on different condition. 3.3uH to 4.7µH inductor value is
recommended for general application circuit. There are three important inductor specifications, DC
resistance, saturation current and core loss. Low DC resistance has better power efficiency.
Capacitor Selection
The output capacitor is required to maintain the DC voltage. Low ESR capacitors are preferred to
reduce the output voltage ripple. Ceramic capacitor of X5R and X7R are recommended, which have
low equivalent series resistance (ESR) and wider operation temperature range.
Diode Selection
Schottky diodes with fast recovery times and low forward voltages are recommended. Ensure the
diode average and peak current rating exceed the average output current and peak inductor current. In
addition, the diode’s reverse breakdown voltage must exceed the output voltage.
Output Voltage Programming
The output voltage is set by a resistive voltage divider from the output voltage to FB. The output
voltage is:
R1 

VOUT  0.6 V 1 

R
2

Layout Considerations
1. The power traces, consisting of the GND trace, the LX trace and the VCC trace should be kept
short, direct and wide.
2. LX、L and D switching node, wide and short trace to reduce EMI.
3. Place CIN near VCC pin as closely as possible to maintain input voltage steady and filter out the
pulsing input current.
4. The resistive divider R1and R2 must be connected to FB pin directly as closely as possible.
5. FB is a sensitive node. Please keep it away from switching node, LX.
6. The GND of the IC, CIN and COUT should be connected close together directly to a ground
plane.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.63
Website: http://www.feeling-tech.com.tw
7/10
FP6298
Vin
L1
D1
1
VIA to
GND
R3
2
3
8
FP6298
4
C1
Vout
7
R1
6
5
R2
C2
C4
C3
GND
Suggested Layout
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.63
Website: http://www.feeling-tech.com.tw
8/10
FP6298
Typical Application
L1 3.3µH
D1 SR54
VIN
3.7V
VOUT
5V
C1
22µF
R1
73K
C2
22µF
1
2
R3
26K
LX
OC
NC
8
C3
22µF
7
C4
22µF
R2
10K
FP6298
3
4
Note:
PGND
VCC
FB
EN
GND
6
5
Don’t pull the Vout back to the FP6298’s Vcc pin. When the system receives the
noise, it will lead to Vout ripple too high and over the absolute maximum rating of
the Vcc pin.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.63
Website: http://www.feeling-tech.com.tw
9/10
FP6298
Package Outline
SOP-8L(EP)
UNIT: mm
Symbols
Min. (mm)
Max. (mm)
A
1.346
1.752
A1
0.050
0.152
A2
1.498
D
4.800
4.978
E
3.810
3.987
H
5.791
6.197
L
0.406
1.270
θ°
0°
8°
Exposed PAD Dimensions:
Symbols
Min. (mm)
Max. (mm)
E1
2.184 REF
D1
2.971 REF
Note:
1. Package dimensions are in compliance with JEDEC outline: MS-012 AA.
2. Dimension ”D” does not include molding flash, protrusions or gate burrs.
3. Dimension “E” does not include inter-lead flash or protrusions.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.63
Website: http://www.feeling-tech.com.tw
10/10