Page 1
FP6291
1MHz, 2.5A Step-Up Current Mode PWM Converter
General Description
The FP6291 is a current mode boost DC-DC converter. Its PWM circuitry with built-in 0.2Ω 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 FP6291 is available in the SOT23-6L package and provides space-saving PCB for the
application fields.
Features
Adjustable Output up to 12V
Internal Fixed PWM frequency: 1.0MHz
Precision Feedback Reference Voltage: 0.6V (±2%)
Internal 0.2
Shutdown Current: 0.1μA
Over Temperature Protection
Over Voltage Protection
Adjustable Over Current Protection: 0.5A ~ 2.5A
Package: SOT23-6L
Ω, 2.5A, 16V Power MOSFET
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.70
1/11
Page 2
Function Block Diagram
GND
V
CC
EN
FP6291
OC
UVLO
FB
0. 6 V
Oscillator
1 MHz
Error Amp..
Soft
Start
Pin Descriptions
SOT23-6L
Top View
AL986
1
LX
2
GND
3
FB
6
OC
5
V
EN
4
CC
Shutdown
Circuitry
Compensation
Slope
OTP
PWM
Comp.
Adjustable
Current Limit
Control
and
Driver
Logic
19kΩ
2.5 A ~ 0. 5 A
OVP
Current Sense
Amp.
~
96 kΩ
Name No. I / O Description
LX 1 O Power Switch Output
GND 2 P IC Ground
FB 3 I Error Amplifier Inverting Input
EN 4 I Enable Control (Active High)
VCC 5 P IC Power Supply
OC 6 I Adjustable Current Limit (Floating Available)
LX
PGND
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.70
2/11
Page 3
Marking Information
Year
SOT23-6L
AL986
Lot Number
Year
Part Number Code
Lot Number: Wafer lot number’s last two digits
For Example: 132386TB 86
: Production year’s last digit
Part Number Code: Part number identification code for this product. It should be always “AL”.
FP6291
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.70
3/11
Page 4
FP6291
Ordering Information
Part Number Code Operating Temperature Package MOQ Description
FP6291LR-G1 AL
-40°C ~ 85°C
SOT23-6L 3000EA Tape & Reel
Absolute Maximum Ratings
Parameter Symbol Conditions
Supply Voltage VCC 0 6 V
LX Voltage VLX 0 16 V
EN,FB Voltage 0 6 V
Min. Typ. Max.
Unit
Power Dissipation PD
Thermal Resistance (Note1) θJA SOT23-6L +220
Junction Temperature TJ +150
Operating Temperature TOP -40 +85
Storage Temperature TST -65 +150
Lead Temperature (soldering, 10 sec) +260
SOT23-6L @TA=25°C
455 mW
Note1:
is measured in the natural convection at TA=25°C on a low effective thermal conductivity test
θ
JA
board of JEDEC 51-3 thermal measurement standard.
IR Re-flow Soldering Curve
°C / W
°C
°C
°C
°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.
Website: http://www.feeling-tech.com.tw
Rev. 0.70
4/11
Page 5
FP6291
Recommended Operating Conditions
Parameter Symbol Conditions
Supply Voltage VIN 2.6 5.5 V
Operating Temperature Range TA Ambient Temperature -40 +85 °C
DC Electrical Characteristics (V
Parameter Symbol Conditions Min. Typ. Max. Unit
System Supply Input
Input Supply Range VCC 2.6 5.5 V
Under Voltage Lockout V
UVLO Hysteresis 0.1 V
Quiescent Current ICC VFB=0.66V, No switching 0.19 mA
Average Supply Current ICC VFB=0.55V, Switching 2.84 mA
Shutdown Supply Current ICC VEN=GND 0.1 µA
Oscillator
Operation Frequency F
Frequency Change with Voltage f△ / V△ VCC=2.6V to 5.5V 5 %
Maximum Duty Cycle T
Reference Voltage
Reference Voltage
Line Regulation
Enable Control
Enable Voltage VEN
2.2 V
UVLO
VFB=1.0V 0.8 1.0 1.2 MHZ
OSC
90 %
DUTY
V
0.588 0.6 0.612 V
REF
VCC=2.6V～5.5V
=3.3V, TA=25°C,unless otherwise specified)
CC
Min. Typ . Max.
0.2 % / V
0.96 V
Unit
Shutdown Voltage VEN
MOSFET
On Resistance of Driver R
Protection
OCP Current I
Adjustable OCP Current I
OTP Temperature T
DS (ON) ILX
OCP
OCP
OTP
=2A 0.2
2.5 A
With External Resistor：
19k~96k
+150
0.6 V
Ω
0.5
2.5
°C
A
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.70
5/11
Page 6
Typical Operating Characteristics
(VCC=3.3V, VOUT=5V, TA= 25°C, unless otherwise noted)
FP6291
100
95
90
85
Efficiency (%)
80
75
70
0 0. 1 0. 2 0.3 0.4 0.5 0.6 0.7 0.8 0. 9 1
Efficiency vs. Output Current
Output C urrent (A)
Operation Frequency vs. Input Voltage
1.16
1.14
1.12
1.1
1.08
1.06
1.04
Operation Frequency (MHz)
1.02
23456
Reference Voltage vs. Input Voltage
0.607
0.606
0.605
0.604
0.603
0.602
Feedback Voltage (V)
0.601
0.6
23456
270
240
210
180
Quiescent Current (uA)
150
120
Quiescent Current vs. Input Voltage
23456
Input V oltage (V)
Inpu t Voltage (V )
Input V oltage (V)
3.5
2.5
1.5
Curre nt Limit (A)
0.5
Current Limit vs. External Resistance (Roc)
3
2
1
0
10 20 30 40 50 60 70 80 90 100
External Resistance (kΩ)
Operation Frequency vs. Temperature
1.1
1.08
1.06
1.04
1.02
Operation Freqency (MHz)
1
-40 -20 0 20 40 60 80 100
Reference Voltage vs. Output Current
0.605
0.604
0.603
0.602
Feedback Voltage (V)
0.601
0.6
0 0.1 0.2 0 .3 0.4 0.5 0.6 0.7 0.8 0.9 1
Average Supply Current vs. Input Voltage
4.5
4
3.5
3
2.5
2
1.5
1
Average Supply Current (mA)
0.5
23456
VIN =5V, V
Temperature (°C)
Output Current (A)
Input V oltage (V)
OUT
=9V
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.70
6/11
Page 7
FP6291
Function Description
Operation
The FP6291 is a current mode boost converter. The constant switching frequency is 1MHz and
operates with pulse width modulation (PWM). Build-in 16V / 2.5A 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 FP6291 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 19k and 96k. The current limit will be set from 2.5A 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:
48000
I
OCP
Over Temperature Protection (OTP)
FP6291 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
FP6291’s OVP threshold is 16V.
3R
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.70
7/11
Page 8
FP6291
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. Also, it
avoid inductor saturation which will cause circuit system unstable and lower core loss at 1 MHz.
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:
1R
OUT
1V6.0V
2R
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 C
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.
near VCC pin as closely as possible to maintain input voltage steady and filter out the
IN
6. The GND of the IC, C
plane.
and C
IN
should be connected close together directly to a ground
OUT
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.70
8/11
Page 9
FP6291
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.70
9/11
Page 10
Typical Application
FP6291
Note: Don’t pull the Vout back to the FP6291’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.
Website: http://www.feeling-tech.com.tw
Rev. 0.70
10/11
Page 11
Package Outline
SOT23-6L
FP6291
Note:
1. Package dimensions are in compliance with JEDEC outline: MO-178 AB.
Symbols Min. (mm) Max. (mm)
A 1.050 1.450
A1 0.050 0.150
A2 0.900 1.300
b 0.300 0.500
c 0.080 0.220
D 2.900 BSC
E 2.800 BSC
E1 1.600 BSC
e 0.950 BSC
e1 1.900 BSC
L 0.300 0.600
L1 0.600 REF
L2 0.250 BSC
θ°
θ1°
θ2°
0° 8°
3° 7°
6° 15°
Unit: mm
2. Dimension “D” does not include molding flash, protrusions or gate burrs.
3. Dimension “E1” 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.
Website: http://www.feeling-tech.com.tw
Rev. 0.70
11/ 11
Page 12
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