FP6165
1.5MHz, 3A Synchronous Step-Down Regulator
General Description
The FP6165 is a high efficiency current mode synchronous buck PWM DC-DC regulator. The
internal generated 0.6V precision feedback reference voltage is designed for low output voltage. Low
RDS (ON) synchronous switch dramatically reduces conduction loss. To extend battery life for portable
application, 100% duty cycle is supported for low-dropout operation. Shutdown mode also helps saving
the current consumption. The FP6165 is packaged in MSOP-10L, DFN-10L and SOP-8L to reduce
PCB space.
Features
Input Voltage Range: 2.5 to 5.5V
Adjustable Output Voltage From 0.6V to VIN
Precision Feedback Reference Voltage: 0.6V (±2%)
Output Current: 3A (Max.)
Duty Cycle: 0~100%
Internal Fixed PWM Frequency: 1.5MHz
Low Quiescent Current: 100μA
No Schottky Diode Required
Built-in Soft Start
Current Mode Operation
Over Temperature Protection
Package: MSOP-10L (EP), DFN-10L, SOP-8L (EP)
Applications
Cellular Telephone
Wireless and DSL Modems
Digital Still Cameras
Portable Products
MP3 Players
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. 0.71
Website: http://www.feeling-tech.com.tw
1/20
FP6165
Function Block Diagram
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. 0.71
Website: http://www.feeling-tech.com.tw
2/20
FP6165
Pin Descriptions
MSOP-10L (EP)
DFN-10L
Name
No. I / O
Description
EN
1
I
Enable / UVLO
VCC
2
P
Supply Voltage
AVCC
3
P
Analog Supply Voltage
PGOOD
4
O
Power Good Open Drain Output
FB / VOUT
5
I
Feedback
AGND
6
P
Analog Ground
SW
7
O
Switch
SW
8
O
Switch
GND
9
P
Ground
GND
10
P
Ground
EP
11
P
Exposed PAD - Must Connect to Ground
Name
No. I / O
Description
EN
1
I
Enable / UVLO
VCC
2
P
Supply Voltage
AVCC
3
P
Analog Supply Voltage
PGOOD
4
O
Power Good Open Drain Output
FB / VOUT
5
I
Feedback
AGND
6
P
Analog Ground
SW
7
O
Switch
SW
8
O
Switch
GND
9
P
Ground
GND
10
P
Ground
EP
11
P
Exposed PAD - Must Connect to Ground
SOP-8L (EP)
Name
No. I / O
EN
1
I
Description
Enable / UVLO
VCC
2
P
Supply Voltage
AVCC
3
P
Analog Supply Voltage
FB / VOUT
4
I
Feedback
AGND
5
P
Analog Ground
SW
6
O
Switch
GND
7
P
Ground
GND
8
P
Ground
EP
9
P
Exposed PAD - Must connect to Ground
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. 0.71
Website: http://www.feeling-tech.com.tw
3/20
FP6165
Marking Information
MSOP-10L (EP)
Reference Voltage Code
Ext: AD →0.6V
6165AD
Halogen Free
Lot Number
Internal ID
Per-Half Month
Year
DFN-10L
SOP-8L (EP)
6165-AD
9Fa-86L
Reference Voltage Code
Ext: AD →0.6V
Halogen Free
Lot Number
Internal ID
Per-Half Month
Year
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. 0.71
Website: http://www.feeling-tech.com.tw
4/20
FP6165
Ordering Information
Part Number
Operating Temperature
Package
MOQ
Description
-40°C ~ +85°C
-40°C ~ +85°C
-40°C ~ +85°C
MSOP-10L (EP)
DFN-10L
SOP-8L (EP)
3000EA
2500EA
2500EA
Tape & Reel
Tape & Reel
Tape & Reel
FP6165ADgR-G1
FP6165ADdR-G1
FP6165ADXR-G1
Absolute Maximum Ratings
Max.
Unit
-0.3
6
V
-0.3
VIN
V
P-Channel Switch Source Current (DC)
3.9
A
N-Channel Switch Source Current (DC)
3.9
A
6
A
MSOP-10L
+70
°C / W
DFN-10L
+65
°C / W
SOP-8L
+50
°C / W
MSOP-10L
+10
°C / W
DFN-10L
+10
°C / W
SOP-8L
+10
°C / W
+150
°C
+150
°C
+260
°C
Parameter
Input Supply Voltage
Symbol Conditions
VIN
EN, VFB, SW Voltage
Min.
Peak SW Switch Sink and Source Current (AC)
Thermal Resistance (Junction to Ambient)
Thermal Resistance (Junction to Case)
θJA
θJC
Junction Temperature
Storage Temperature
-65
Lead Temperature (soldering, 10 sec)
Typ.
Suggested IR Re-flow Soldering Curve
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Rev. 0.71
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5/20
FP6165
Recommended Operating Conditions
Parameter
Symbol
Supply Voltage
Conditions
VIN
Operating Temperature
Min.
Typ.
Max.
Unit
2.5
5.5
V
-40
+85
°C
DC Electrical Characteristics (VIN=3.6V ,TA= 25°C , unless otherwise noted)
Parameter
Min.
Typ.
Max.
Unit
TA=25°C
0.588
0.6
0.612
V
-40°C~+85°C
0.582
0.6
0.618
V
Symbol Conditions
Regulated Feedback Voltage
VFB
Line Regulation with VREF
VFB
VIN=2.5V to 5.5V
0.04
0.4
/V
Output Voltage LineRegulation
VOUT
VIN=2.5 to 5.5V
0.04
0.4
%/V
RDS (ON) of P-Channel FET
RDS (ON) P ISW=100mA
60
90
mΩ
RDS (ON) of N-Channel FET
RDS(ON) N ISW =-100mA
60
90
mΩ
±0.01
±1
µA
SW Leakage
ILSW
VEN=0V, VIN=5V
Peak Inductor Current
IPK
VFB=0.5V
3.75
Input Voltage Range
VIN
-40°C~+85°C
2.5
Quiescent Current
ICC
5
6
A
5.5
V
1
µA
Shutdown, VEN=0V
0.1
Active, VFB=0.5V, VEN=VIN
100
µA
PFM, VFB=0.7V, VEN=VIN
80
µA
EN Threshold
VEN
-40°C~ +85°C
EN Leakage Current
IEN
-40°C ~+85°C
Oscillator Frequency
FOSC
VFB=0.6V, -40°C ~+85°C
0.3
1.2
1
1.5
V
±0.01
±1
µA
1.5
1.8
MHz
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. 0.71
Website: http://www.feeling-tech.com.tw
6/20
FP6165
Typical Operating Characteristics (TA= 25°C, VIN=3.3V, unless otherwise noted)
Quiescent Current VS. Input Voltage
Shutdown Current VS. Input Voltage
100
0.5
VFB=0.65V
90
0.4
Shutdown Current (uA)
80
Quiescent Current (uA)
VEN=0
V
0.45
70
0.35
60
50
0.3
0.25
40
30
0.2
0.15
20
10
0.1
0.05
0
0
2.5
3
3.5
4
Input Voltage (V)
4.5
5
5.5
2.5
3
3.5
Line Regulation
5
1.8
1.79
1.78
1.77
1.76
1.75
1.74
1.73
1.72
1.71
1.7
VIN=3.3V
Vout=1.8V
0.608
5.5
VIN=3.3V
Vout=1.8V
Output Voltage (V)
0.606
Reference Voltage (V)
4.5
Load Regulation
0.61
0.604
0.602
0.6
0.598
0.596
0.594
0.592
0.59
2.5
3
3.5
4
Input Voltage (V)
4.5
5
0.5
5.5
1
Reference Volatge VS. Temperature
1.5
2
Output Current (A)
2.5
3
Frequency VS. Input Voltage
0.61
1.65
VIN=3.3V
Vout=1.8V
0.608
VIN=3.3V
Vout=1.8V
1.63
0.606
1.61
0.604
1.59
Frequency (MHz)
Reference Volatge (V)
4
Input Voltage (V)
0.602
0.6
0.598
0.596
1.57
1.55
1.53
1.51
0.594
1.49
0.592
1.47
0.59
1.45
-40
-20
0
20
40
Temperature (℃)
60
80
100
2.5
3
3.5
4
Input Voltage (V)
4.5
5
5.5
Body Temperature VS. Output Current
Frequency VS. Temperature
100
1.65
VIN=3.3V
Vout=1.8V
1.63
VIN=3.3V
Vout=1.8V
90
Body Temperature (℃)
1.61
Frequency (MHz)
1.59
1.57
1.55
1.53
1.51
1.49
80
70
60
50
40
30
20
10
1.47
0
1.45
-40
-20
0
20
40
Temperature (℃)
60
80
100
0.5
1
1.5
2
Output Current (A)
2.5
3
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. 0.71
Website: http://www.feeling-tech.com.tw
7/20
FP6165
Function Description
Control Loop
The FP6165 is a high efficiency current mode synchronous buck regulator. Both the main
(P-channel MOSFET) and synchronous (N-channel MOSFET) switches are built internally.
With
current mode operation, the PWM duty is controlled both by the error amplifier output and the peak
inductor current. At the beginning of each cycle, the oscillator turn on the P-MOSFET switch to
source current from VIN to SW output. Then, the chip starts to compare the inductor current with the
error amplifier output.
Once the inductor current is larger than the error amplifier output, the
P-MOSFET switch is turned off. When the load current increases, the feedback voltage FB will
slightly drop. This causes the error amplifier to output a higher current level until the prior mentioned
peak inductor current reach the same level. The output voltage then can be sustained at the same.
When the top P-MOSFET switch is off, the bottom synchronous N-MOSFET switch is turned on.
Once the inductor current reverses, both top and bottom MOSFET will be turn off to leave the SW pin
into high impedance state.
The FP6165’s current mode control loop also includes slope compensation to suppress
sub-harmonic oscillations at high duty cycles. This slope compensation is achieved by adding a
compensation ramp to the inductor current signal.
LDO Mode
The FP6165’s maximum duty cycle can reach 100%. That means the driver’s main switch is
turn on through out whole clock cycle. Once the duty reaches 100%, the feedback path no longer
controls the output voltage. The output voltage will be the input voltage minus the main switch
voltage drop.
Over Current Protection
FP6165 limits the peak main switch current cycle by cycle. When over current occurs, chip will
turn off the main switch and turn the synchronous switch on until next cycle.
Short Circuit Protection
When the FB pin is drop below 300mV, the chip will tri-state the output pin SW automatically. After
300us rest to avoid over heating, chip will re-initiate PWM operation with soft start.
Power Good
The power good pin is an open-drain output. Connects a 100kΩ pull up resistor between VIN and
this pin to obtain a PGOOD voltage. When the output voltage is not within ±10% of setting output
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Rev. 0.71
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8/20
FP6165
voltage, the PGOOD pin will be pulled down to ground immediately. After the output voltage is
within ±10% of setting output voltage for 42.7µs (typ.), the PGOOD pin pull-down is turned off. Then it
can be pulled up to VIN through external pull-high resister.
Connect this pin to AGND if not used.
Thermal Protection
FP6165 will shutdown automatically when the internal junction temperature reaches 150℃ to
protect both the part and the system.
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. 0.71
Website: http://www.feeling-tech.com.tw
9/20
FP6165
Application Information
Input capacitor Selection
The input capacitor must be connected to the VIN pin and GND pin of
FP6165 to maintain
steady input voltage and filter out the pulsing input current. The voltage rating of input capacitor must
be greater than maximum input voltage plus ripple voltage.
In switch mode, the input current is discontinuous in a buck converter. The source current
waveform of the high-side MOSFET is a square wave. To prevent large voltage transients, a low ESR
input capacitor sized for the maximum RMS current must be used. The RMS value of input capacitor
current can be calculated by:
IRMS IO _ MAX
VO
VIN
V
1 O
VIN
It can be seen that when VO is half of VIN, CIN is under the worst current stress. The worst current
stress on CIN is IO_MAX/2.
Inductor Selection
The value of the inductor is selected based on the desired ripple current. Large inductance gives
low inductor ripple current and small inductance result in high ripple current. However, the larger value
inductor has a larger physical size, higher series resistance, and/or lower saturation current. In
experience, the value is to allow the peak-to-peak ripple current in the inductor to be 10%~20%
maximum load current. The inductance value can be calculated by:
L
( VIN VO ) VO
( VIN VO )
VO
f IL VIN f 2 (10% ~ 20%)IO VIN
The inductor ripple current can be calculated by:
IL
VO
V
1 O
f L VIN
Choose an inductor that does not saturate under the worst-case load conditions, which is the
load current plus half the peak-to-peak inductor ripple current, even at the highest operating
temperature. The peak inductor current is:
IL _ PEAK IO
IL
2
The inductors in different shape and style are available from manufacturers. Shielded inductors
are small and radiate less EMI issue. But they cost more than unshielded inductors. The choice
depends on EMI requirement, price and size.
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. 0.71
Website: http://www.feeling-tech.com.tw
10/20
FP6165
Dimensions (mm)
Component Supplier
1.0
8.3×8.3×4.5
FENG-JUI
TPRH8D43-2R2M
1.0
10.3×10.3×4.0
FENG-JUI
TPRH10D40-2R2M
2.2
8.3×8.3×4.5
FENG-JUI
TPRH8D43-3R3M
2.2
10.3×10.3×4.0
FENG-JUI
TPRH10D40-3R3M
Inductor Value (µH)
Model
Output Capacitor Selection
The output capacitor is required to maintain the DC output voltage. Low ESR capacitors are
preferred to keep the output voltage ripple low. In a buck converter circuit, output ripple voltage is
determined by inductor value, switching frequency, output capacitor value and ESR. The output ripple
is determined by:
1
VO IL ESR COUT
8 f COUT
Where f = operating frequency, COUT= output capacitance and ΔIL = ripple current in the inductor.
For a fixed output voltage, the output ripple is highest at maximum input voltage since ΔIL increases
with input voltage.
Capacitor Value
Case Size
Component Supplier
Model
10μF
0805
Taiyo Yuden
JMK212BJ106MG
10μF
0805
TDK
C12012X5ROJ106K
22μF
0805 1206
TDK
C2012JB0J226M
Using Ceramic Input and Output Capacitors
Care must be taken when ceramic capacitors are used at the input and the output. When a
ceramic capacitor is used at the input and the power is supplied by a wall adapter through long wires, a
load step at the output can induce ringing at the input, VIN. At best, this ringing can couple to the output
and be mistaken as loop instability. At worst, a sudden inrush current through the long wires can
potentially cause a voltage spike at VIN, which may large enough to damage the part. When choosing
the input and output ceramic capacitors, choose the X5R or X7R specification. Their dielectrics have
the best temperature and voltage characteristics of all the ceramics for a given value and size.
Output Voltage Programming
In the adjustable version, the output voltage is set using a resistive voltage divider from the output
voltage to FB. The output voltage is:
R
VO 0.6 V 1 1
R2
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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. 0.71
Website: http://www.feeling-tech.com.tw
11/20
FP6165
The recommended resistor value is summarized below:
VOUT (V)
R1 (Ω)
R2 (Ω)
C3 (F)
0.6
200k
Not Used
Not Used
1.2
200k
200k
10p
1.5
300k
200k
10p
1.8
200k
100k
10p
2.5
270k
85k
10p
3.3
306k
68k
10p
PC Board Layout Checklist
1. The power traces, consisting of the GND, SW and VIN trace should be kept short, direct and
wide.
2. Place CIN near VIN pin as closely as possible to maintain input voltage steady and filter out the
pulsing input current.
3. The resistive divider R1 and R2 must be connected to FB pin directly and as closely as
possible.
4. FB is a sensitive node. Please keep it away from switching node, SW. A good approach is to
route the feedback trace on another PCB layer and have a ground plane between the top and
feedback trace routing layer. This reduces EMI radiation on to the DC-DC converter its own
voltage feedback trace.
5. Keep the GND plates of CIN and COUT as close as possible. Then connect this to the ground
plane (if one is used) with several vias. This reduces ground plane noise by preventing the
switching currents from circulating through the ground plane. It also reduces ground bounce at
FP6161 by giving it a low impedance ground connection.
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Rev. 0.71
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12/20
FP6165
Suggested Layout for DFN-10L / MSOP-10L
Suggested Layout for SOP-8L
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Rev. 0.71
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13/20
FP6165
Typical Application
VIN
2.5V / 5.5V
C1
22μF
R3
100K
1
EN
2
VCC
GND
GND
10
9
L1 1.0μH
FP6165
3
AVCC
SW
8
4
PGOOD
SW
7
5
FB / VOUT
AGND
6
VOUT
1.8V / 2A
R1
200K
C3
10pF
C2
22μF
GND
R2
100K
DFN-10L / MSOP-10L
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Rev. 0.71
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14/20
FP6165
VIN = 3.3V, VOUT = 1.8V, L = 1μH, TA = +25ºC
Load Transient Response
Enable ON
ILOAD: 300mA~3A
ILOAD: 3A
Output Ripple Voltage
Power Good
ILOAD: 3A
Power ON
Power Good
ILOAD: 3A
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Rev. 0.71
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15/20
FP6165
Short Circuit
Efficiency
Efficiency VS. Output Current
100.00
90.00
80.00
Efficiency (%)
70.00
60.00
2.7V
50.00
3.6V
4.2V
40.00
30.00
20.00
10.00
0.00
0
1
10
100
1000
10000
Output Current (mA)
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Rev. 0.71
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16/20
FP6165
Package Outline
MSOP-10L (EP)
UNIT: mm
Symbols
Min. (mm)
Max. (mm)
A
1.100
A1
0.000
0.150
A2
0.750
0.950
b
0.170
0.270
c
0.080
0.230
D
3.000 BSC.
E
4.900 BSC.
E1
3.000 BSC.
e
0.500 BSC.
L
0.400
L1
θ°
0.800
0.950 REF.
0°
8°
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. 0.71
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17/20
FP6165
MSOP-10L (EP) continued
Exposed PAD Dimensions:
Symbols
Min. (mm)
Max. (mm)
E2
1.715 REF
D1
1.600 REF
Note:
1. Package dimensions are in compliance with JEDEC outline: MO-187 BA-T.
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.
Rev. 0.71
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18/20
FP6165
DFN-10L (EP)
UNIT: mm
Symbols
Min. (mm)
Max. (mm)
A
0.700
0.800
A1
0.000
0.050
A3
b
0.20REF
0.180
0.300
D
3.00
E
3.00
D2
2.200
2.700
E2
1.400
1.750
e
0.500
L
0.300
K
0.200
0.500
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. 0.71
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19/20
FP6165
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°
Min. (mm)
Max. (mm)
Exposed PAD Dimensions:
Symbols
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.
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20/20
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