FP6161 [FEELING]
1.5MHz, 1A Synchronous Step-Down Regulator;
| 型号： | FP6161 |
| 厂家： | 
Feeling Technology |
| 描述： | 1.5MHz, 1A Synchronous Step-Down Regulator |
| 文件： | 总16页 (文件大小：436K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
FP6161
1.5MHz, 1A Synchronous Step-Down Regulator
General Description
The FP6161 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 FP6161 is packaged in DFN-6L, SOT23-5L, and TSOT23-5L to reduce
PCB space.
Features
Input Voltage Range: 2.5 to 5.5V
Precision Feedback Reference Voltage: 0.6V (±2%)
Output Current: 1A (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: DFN-6L (2x2mm), SOT23-5L, TSOT23-5L
Applications
Cellular Telephone
Wireless and DSL Modems
Digital Still Cameras
Portable Products
MP3 Players
Typical Application Circuit
VIN
SW
VIN
VOUT
FP6161
RUN
FB / VOUT
GND
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. 0.67
1/16
FP6161
Function Block Diagram
VCC
Current
Sense
Current
Limit
Slope
Compensation
OSC
S
R
Q
Q
+
Pre-Driver
and
Anti Shoot-
through
PWM
Com-
Switching
Control Logic
SW
0.6V
+
parator
-
Error
Amp.
SR Latch
FB/
VOUT
-
UVLO
+
FBUV
Com-
Reverse
Current
Detector
parator
-
0.3V
Shutdown
Control
RUN
Reference
Voltage
Generator
OTP
GND
Pin Descriptions
DFN-6L
Name No. I / O
Description
NC
RUN
VIN
1
2
3
4
5
6
7
No Connect
Enable Pin
Power Supply
Switch
I
P
O
P
I
SW
GND
FB / VOUT
EP
Ground
Feedback
P
Exposed PAD – Must Connect to Ground
SOT23-5L / TSOT23-5L
Name No. I / O
Description
Enable
RUN
GND
1
2
3
4
5
I
P
O
P
I
Ground
SW
Switch
VIN
Power Supply
Feedback
FB / VOUT
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. 0.67
2/16
FP6161
Marking Information
DFN-6L
SOT23-5L / TSOT23-5L
Halogen Free: Halogen free product indicator
Lot Number: Wafer lot number’s last two digits
For Example: 132386TB 86
Part Number Code: Part number identification code for this product. It should be always “ZY”.
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.67
3/16
FP6161
Ordering Information
Part Number
Code
Operating Temperature
Package
MOQ
Description
DFN-6L
(2x2mm)
FP6161dR-LF-ADJ
ZY
2500EA
Tape & Reel
-40°C ~ +85°C
FP6161KR-LF-ADJ
FP6161iR-LF-ADJ
ZY
ZY
SOT23-5L
3000EA
3000EA
Tape & Reel
Tape & Reel
-40°C ~ +85°C
-40°C ~ +85°C
TSOT23-5L
Absolute Maximum Ratings
Parameter
Symbol Conditions
Min.
-0.3
-0.3
Typ.
Max.
Unit
V
Input Supply Voltage
VIN
6
RUN, VFB, SW Pin Voltage
VIN
V
P-Channel Switch Source Current (DC)
N-Channel Switch Source Current (DC)
Peak SW Switch Sink and Source Current (AC)
1.5
A
1.5
A
2
A
DFN-6L
+165
+250
+250
+20
+90
+90
+150
+150
750
500
500
+260
°C / W
°C / W
°C / W
°C / W
°C / W
°C / W
°C
Thermal Resistance (Junction to Ambient)
Thermal Resistance (Junction to Case)
θJA
SOT23-5L
TSOT23-5L
DFN-6L
θJC
SOT23-5L
TSOT23-5L
Junction Temperature
Storage Temperature
-65
°C
DFN-6L
mW
mW
mW
°C
Allowable Power Dissipation
PD
SOT23-5L
TSOT23-5L
Lead Temperature (soldering, 10 sec)
Suggested 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.
Website: http://www.feeling-tech.com.tw
Rev. 0.67
4/16
FP6161
Recommended Operating Conditions
Parameter
Symbol
Conditions
Min.
2.5
Typ.
Max. Unit
Supply Voltage
Operating Temperature
VIN
5.5
V
-40
+85
°C
DC Electrical Characteristics (TA= 25°C, VIN=3.6V, unless otherwise noted)
Parameter
Symbol
Conditions
Min.
0.588
0.582
Typ.
Max.
0.612
0.618
0.4
Unit
V
0.6
TA=25°C
Regulated Feedback Voltage
VFB
0.6
V
-40°C ~+85°C
VIN=2.5V to 5.5V
VIN=2.5 to 5.5V
Line Regulation with VREF
Output Voltage Line Regulation
RDS (ON) of P-Channel FET
RDS (ON) of N-Channel FET
SW Leakage
0.04
0.04
0.28
VFB
/ V
% / V
Ω
0.4
VOUT
RDS(ON) P ISW=100mA
RDS (ON) N ISW =-100mA
0.35
0.32
±1
0.25
±0.01
1.5
Ω
µA
A
ILSW
IPK
VRUN=0V, VIN=5V
VFB=0.5V
Peak Inductor Current
1.125
1.875
1
Shutdown, VRUN=0V
Active, VFB=0.5V, VRUN=VIN
0.1
µA
µA
V
Quiescent Current
ICC
100
1
RUN Threshold
VRUN
IRUN
0.3
1.2
1.5
±1
RUN Leakage Current
Oscillator Frequency
±0.01
1.5
µA
MHz
FOSC
VFB=0.6V
1.8
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.67
5/16
FP6161
Typical Operating Characteristics
(TA= 25°C, VIN=3.6V, unless otherwise noted)
Supply Current vs. VIN
Supply Current vs. VIN
100
24
23
22
21
20
19
18
VFB=0.5V
VFB=0.7V
95
90
85
80
75
70
65
85℃
85℃
-45℃
25℃
-45℃
25℃
2
3
4
5
6
2
3
4
5
6
VIN (V)
V
IN (V)
Line Regulation
Supply Current vs. VIN
0.61
0.605
0.6
18
TA=25℃
Shutdown
16
14
12
10
8
85℃
0.595
0.59
6
4
25℃
-45℃
2
0
0.585
2
3
4
5
6
2
3
4
5
6
VIN (V)
VIN (V)
Reference Voltage vs. Temperature
Frequency vs. VIN
1.56
1.54
1.52
1.5
0.605
0.604
0.603
0.602
0.601
0.6
VI N=3.6V
VIN=3.6V
0.599
0.598
0.597
0.596
0.595
1.48
1.46
1.44
2
3
4
IN (V)
5
6
-60 -50 -40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
V
Temperature
)
(℃
Switch Leakage vs. Input Volatge
Frequency vs. Temerature
1.58
1.56
1.54
1.52
1.5
1.2
1
TA=25℃
T =25
℃
A
0.8
0.6
0.4
0.2
0
1.48
1.46
1.44
1.42
1.4
Synchronous Switch
Main Switch
1
2
3
4
5
6
7
-50 -40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
Temperature (
V
IN (V)
)
℃
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. 0.67
6/16
FP6161
Function Description
Control Loop
The FP6161 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 FP6161’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 FP6161’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
FP6161 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 drops 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.
Thermal Protection
FP6161 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.
Website: http://www.feeling-tech.com.tw
Rev. 0.67
7/16
FP6161
Application Information
Input Capacitor Selection
The input capacitor must be connected to the VIN pin and GND pin of FP6161 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:
VO
VO
IRMS IO
1
MAX
V
V
IN
IN
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:
(V VO ) VO
(V VO )
2(10% ~ 20%)IO
VO
IN
IN
L
f IL
V
f
V
IN
IN
The inductor ripple current can be calculated by:
VO
VO
IL
1
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
2
IL _PEAK IO
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. 0.67
8/16
FP6161
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.
Inductor Value (µH)
Dimensions
4.2×3.7×1.2
4.4×5.8×1.2
4.2×3.7×1.2
4.2×3.7×1.2
4.4×5.8×1.2
4.9×4.9×1.0
Component Supplier
FENG-JUI
Sumida
Model
2.2
2.2
3.3
4.7
4.7
4.7
TP4212-2R2M
CMD4D11 2R2
TP4212-3R3M
TP4212-4R7M
CMD4D11 4R7
CLSD09 4R7
FENG-JUI
FENG-JUI
Sumida
Sumida
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 ESRCOUT
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 (µF) Case Size Component Supplier
Model
4.7
10
10
22
0603
0805
TDK
Taiyo Yuden
TDK
C1608JB0J475M
JMK212BJ106MG
C12012X5ROJ106K
C2012JB0J226M
0805
0805 1206
TDK
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 specifications. Their dielectrics have
the best temperature and voltage characteristics of all the ceramics for a given value 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.
Website: http://www.feeling-tech.com.tw
Rev. 0.67
9/16
FP6161
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
1
VO 0.6V 1
R2
The recommended resistor value is summarized below:
VOUT (V)
R1 (Ω)
200k
200k
300k
200k
270k
306k
R2 (Ω)
Not Used
200k
C3 (F)
Not Used
10p
0.6
1.2
1.5
1.8
2.5
3.3
200k
10p
100k
10p
85k
10p
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.
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. 0.67
10/16
FP6161
Suggested Layout for SOT23-5L
Suggested Layout for DFN-6L
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. 0.67
11/16
FP6161
Typical Application
L1 3.3uH
3
4
VIN
2.5V~5.5V
VOUT
2.5V/1A
VIN
SW
R1
270K
C3
10pF
FP6161
C2
10µF
C1
10µF
1
5
RUN
FB / VOUT
R2
85K
GND
2
SOT23-5L / TSOT23-5L
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. 0.67
12/16
FP6161
ILOAD: 100mA~1A
ILOAD: 200mA~1A
Ch1:VOUT Ch2: ISW
Ch1: VOUT Ch2: ISW
EN On waveform (VOUT: 1.8V)
Efficiency (VOUT: 2.5V)
Efficiency VS. Output Current
100
90
80
70
60
50
40
30
20
10
0
Vin=2.7V
Vin=3.6V
Vin=4.2V
0.1
1.0
10.0
100.0
1000.0
Output Current (mA)
Ch1: EN Ch2: SW Ch3: VOUT Ch4: ISW
Efficiency (VIN: 5.3V)
Efficiency VS Output Current
100
90
80
70
60
Vout=3.3V
50
40
30
20
10
0
Vout=1.8V
Vout=1.2V
0.1
1.0
10.0 100.0
Output Current (mA)
1000.0
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. 0.67
13/16
FP6161
Package Outline
DFN-6L
Unit: MM
Symbols
Min. (mm)
0.700
Max. (mm)
0.800
A
A1
b
0.000
0.050
0.200
0.300
c
0.190
0.250
D
1.950
2.050
D2
E
1.350
1.450
1.950
2.050
E2
e
0.750
0.850
0.650 REF
L
0.300
0.000
0.400
0.075
y
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. 0.67
14/16
FP6161
SOT23-5L
Unit: MM
Symbols
Min. (mm)
1.050
Max.(mm)
1.350
A
A1
A2
b
0.050
0.150
1.000
1.200
0.250
0.500
c
0.080
0.200
D
2.700
3.000
E
2.600
3.000
E1
e
1.500
1.700
0.950 BSC
1.900 BSC
e1
L
0.300
0.550
L1
L2
θ°
θ1°
θ2°
0.600 REF
0.250 BSC
0°
3°
6°
10°
7°
10°
Note:
1. Package dimensions are in compliance with JEDEC outline: MO-178 AA.
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. 0.67
15/16
FP6161
TSOT23-5L
Unit: MM
Symbols
Min.(mm)
0.750
Max.(mm)
0.800
A
A1
A2
b
0.000
0.050
0.700
0.775
0.350
0.500
c
0.100
0.200
D
2.800
3.000
E
2.600
3.000
E1
e
1.500
1.700
0.950 BSC
1.900 BSC
e1
L
0.370
0.600
L1
L2
R
0.600 REF
0.250 BSC
0.100
0.100
0°
R1
θ°
θ1
0.250
8°
4°
12°
Note:
1. Dimension “D” does not include molding flash, protrusions or gate burrs.
2. 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. 0.67
16/16
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