FP5108 [FEELING]
Low Voltage DC / DC Buck Controller;
| 型号： | FP5108 |
| 厂家： | 
Feeling Technology |
| 描述： | Low Voltage DC / DC Buck Controller |
| 文件： | 总18页 (文件大小：522K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
FP5108
Low Voltage DC / DC Buck Controller
General Description
The FP5108 is a buck topology switching regulator controller for low operating voltage
applications field. The FP5108 includes a totem-pole single output stage for driving PNP transistor or
P-MOS, high precision reference (0.5V) for comparing output voltage with feedback amplifier, an
internal duty control for controlling the maximum duty cycle, programmable soft start with short circuit
protection and external shutdown control.
Features
Wide Supply Voltage Operating Range: 1.8 to 12V
Precision Feedback Reference Voltage: 0.5V (±2%)
High Speed Oscillator Frequency: 600KHz max.
Low Current Consumption: Operation Mode 5.5mA
Low Current Consumption: Shutdown Mode 1μA
Programmable Soft Start Function (SS)
Short Circuit Protection Function (SCP)
Totem-pole Output
Shutdown Function with Adjustable Driving Current
Package: SOP-8L, SOP-8L (EP), TSSOP-8L and MSOP-8L
Applications
Low Input Voltage DC / DC Converter
Battery used Equipment
Low Output Voltage DC / DC Converter
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. 0.9
1/18
FP5108
Function Block Diagram
OSC
VCC
Sawtooth Wave
Oscillator
Reference
0.8V
Regulator
0.1V
OUT
1.25V
0.1V
PWM
Comp.
FB
36kΩ
+
+
+
Output Drive
Control Circuits
+
Error Amp.
500KΩ
0.5V
DTC 0.6V
0.22V
COMP
Soft Start
SCP Circuits
CTL
SCP
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. 0.9
2/18
FP5108
Pin Descriptions
SOP-8L
Name No. I / O
Description
FB
1
I
Error amplifier Inverting input
Connected a Capacitor
Soft Start and SCP Function pin
SCP
2
I
VCC
CTL
OUT
GND
3
4
5
6
P
I
IC Power Supply
Shutdown or Adjust Driving Current pin
Totem-pole Output
O
P
IC Ground
Capacitor and Resistor Connected for
Adjusting the Oscillation Frequency
OSC
7
8
I
COMP
O
Error Amplifier Compensation Output
SOP-8L (EP)
Top View
Name No. I / O
Description
1
2
3
4
8
7
6
5
FB
COMP
OSC
GND
OUT
FB
1
I
Error amplifier Inverting input
Connected a Capacitor
Soft Start and SCP Function pin
SCP
2
I
SCP
VCC
VCC
CTL
OUT
GND
3
4
5
6
P
I
IC Power Supply
Shutdown or Adjust Driving Current pin
Totem-pole Output
CTL
O
P
IC Ground
Bottom View
Capacitor and Resistor Connected for
adjusting the Oscillation Frequency
OSC
7
I
COMP
EP
8
9
O
P
Error Amplifier Compensation Output
Exposed PAD. Must connect to GND
EP
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. 0.9
3/18
FP5108
TSSOP-8L
Name No. I / O
Description
FB
1
I
Error amplifier Inverting input
Connected a Capacitor
Soft Start and SCP Function pin
SCP
2
I
VCC
CTL
OUT
GND
3
4
5
6
P
I
IC Power Supply
Shutdown or Adjust Driving Current pin
Totem-pole Output
O
P
IC Ground
Capacitor and Resistor Connected for
adjusting the Oscillation Frequency
OSC
7
8
I
COMP
O
Error Amplifier Compensation Output
MSOP-8L
Name No. I / O
Description
FB
1
I
Error amplifier Inverting input
Connected a Capacitor
Soft Start and SCP Function pin
SCP
2
I
VCC
CTL
OUT
GND
3
4
5
6
P
I
IC Power Supply
Shutdown or Adjust Driving Current pin
Totem-pole Output
O
P
IC Ground
Capacitor and Resistor Connected for
adjusting the Oscillation Frequency
OSC
7
8
I
COMP
O
Error Amplifier Compensation Output
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. 0.9
4/18
FP5108
Marking Information
SOP-8L & SOP-8L (EP)
TSSOP-8L
FP5108
9Fa86L
Halogen Free
Lot Number
Internal ID
Per-Half Month
Year
MSOP-8L
FP5108
9Fa86L
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.9
5/18
FP5108
Ordering Information
Part Number
Operating Temperature
Package
SOP-8L
MOQ
Description
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
FP5108DR-LF
2500EA
2500EA
2500EA
2500EA
-10°C ~ +85°C
-10°C ~ +85°C
-10°C ~ +85°C
-10°C ~ +85°C
FP5108XR-LF
FP5108WR-LF
FP5108TR-LF
SOP-8L (EP)
TSSOP-8L
MSOP-8L
Absolute Maximum Ratings
Parameter
Power Supply Voltage
Output Source Current
Output Sink Current
Symbol Conditions
Min.
Typ.
Max.
Unit
V
VIN
12
-50
mA
mA
mW
mW
mW
mW
50
570
400
400
600
SOP-8L, TA≦+25℃
SOP-8L (EP), TA≦+25℃
TSSOP-8L (EP), TA≦+25℃
MSOP-8L (EP), TA≦+25℃
Allowable Power Dissipation
Thermal Resistance Junction to
Ambient
(SOP package)
+175
℃ / W
Storage Temperature
Lead Temperature
-55
+125
+260
℃
℃
(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. 0.9
6/18
FP5108
Recommended Operating Conditions
Parameter
Symbol
Conditions
Min.
1.8
Typ.
Max.
Unit
V
Supply Voltage
Operating Temperature
12
-10
+85
℃
DC Electrical Characteristics (VCC= 5V, VCH1=12V, unless otherwise noted)
Parameter
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Under Voltage Lock-Out Section (UVLO)
Low Threshold Voltage
VLOW
0.9
1.5
V
V
Upper Threshold Voltage
Soft Start Section (SS)
Input Source Current
VUPPER
1.1
1.3
ISS
VSS=0V
-1.5
0.8
-1.0
0.9
-0.7
1.0
µA
Soft Start Threshold Voltage
VSST
V
Short Circuit Protection Section (S.C.P.)
Input Source Current
S.C.P. Threshold Voltage
Oscillator Section
ISCP VSCP= 0V
VSCP
-1.5
0.7
-1.0
0.8
-0.7
0.9
μA
V
Oscillation Frequency
f
400
500
2
600
10
KHz
%
RT=3.0KΩ, CT=270pF
Frequency Change with Voltage
Δf / ΔV VCC=2V to 15V
Frequency Change with
Temperature
Δf / ΔT
5
%
TA = 0℃ to 85℃
Idle Period Adjustment Section
RT=3.0kΩ, CT=270pF,
VFB=0.8V
Maximum Duty Cycle
TDUTY
75
85
%
Total Device Section
Stand-by Current
ISTANDBY Pin4 is Open or VCC
1
μA
Average Supply Current
Error Amplifier Section
Input Threshold Voltage
IAVE
5.0
10
mA
RB=390Ω, VCC=0~20V
VFB
VCOMP=450mV
VCC=2V to 15V
480
500
5
520
20
mV
mV
ΔVFB
ΔV
ΔVFB
ΔT
/
/
VT Change with Voltage
VT Change with Temperature
1
%
TA = -10℃ to 85℃
Input Bias Current
IB
-1.0
0.78
24
-0.2
100
6
1.0
μA
V / V
MHz
V
Voltage Gain
Av
Frequency Bandwidth
Output Voltage Swing Positive
Output Voltage Swing Negative
Output Source Current
Output Sink Current
BW
VPOS
VNEG
Av=0 dB
0.87
0.05
-40
40
0.2
-24
V
ISOURCE VCOMP=450mV
ISINK VCOMP=450mV
μA
μA
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. 0.9
7/18
FP5108
Parameter
Output Section
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Output High Voltage
VOH1
VOH2
VOL1
VOL2
1.0
0.8
1.2
1.0
0.1
0.1
V
V
V
V
RB=390Ω, IO=-15mA
RB=750Ω, IO=-10mA,
VCC= 1.8V
Output High Voltage
Output Saturation Voltage
Output Saturation Voltage
0.2
0.2
-20
RB=390Ω, IO=15mA
RB=750Ω, IO=10mA, VCC
1.8V
=
Output Source Current
Output Sink Current
IOSOURCE
IOSINK
-40
40
mA
mA
RB=390Ω, Vo=0.9V
30
RB=390Ω, Vo=0.3V
Output Current Setting / Control Section
Pin Voltage
VBR
IOFF
ION
0.15
-20
0.22
0.3
0
V
RB=390Ω
Input off Condition
Input on Condition
Pin Current Range
μA
μA
mA
-45
-0.1
IBR
-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. 0.9
8/18
FP5108
Typical Characteristics
Supply voltage vs. Supply current
Supply voltage vs. Input threshold voltage
12
1.2
1.0
Ta=25℃
RB=390
Ta=25℃
10
8
6
4
2
0
0.8
0.6
0.4
0.2
0
8
8
0
4
12
16
20
0
4
12
16
20
Supply voltage Vcc(V)
Figure 1
Supply voltage Vcc(V)
Figure 2
Ambient temperature vs. Input threshod
voltage variation ratio
High level output
30
10
5
1.2
Vcc = 2V
Vcc=2V
RB=390
Ta=25℃
1.0
0.8
0
0.6
0.4
0.2
- 5
-10
-15
-25
0
25
50
75
100
0
-10
-20
-30
-40
-50
0
Ambient Temperature Ta (℃)
Figure 3
High level output current Iout(mA)
Figure 4
Low level output
CTL pin current vs. Output source current
600
500
400
300
200
100
-60
-50
-40
-30
-20
-10
Vcc=2V
RB=390
Ta=25℃
Vcc=2V
Vout=0.9V
Ta=25℃
0
0
20
40
60
80
100
-0.4
-0.8
-1.2
-1.6
-2.0
0
0
Low level output current Iout(mA)
Figure 5
CTL pin current IBR(mA)
Figure 6
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. 0.9
9/18
FP5108
CTL pin current vs. CTL pin voltage
CTL pin current vs. Supply current
600
500
400
300
200
100
6.0
5.0
4.0
3.0
2.0
1.0
Vcc=2V
Ta=25℃
Vcc=2V
Ta=25℃
0
0
-0.4
-0.8
-1.2
-1.6
-2.0
-20
-40
-60
-80
-100
0
0
CTL pin current IBR(mA)
Figure 7
CTL pin current IBR(uA)
Figure 8
TRIANGLE OSCILLATOR FREQUENCY
Supply voltage vs. Frequency variation ratio
VS
15
10
5
TIMING RESISTANCE
CT=270PF
RT=3.0KΩ
Ta=+25℃
1 M
100 K
10 K
2 K
Vcc = 2V
T
A
= 25oC
C
C
= 100 pF
T
T
0
= 1000 pF
-5
-10
-15
C
= 10000 pF
T
8
0
4
12
16
20
1 K
4 K 10 K
40 K 100 K
400 K 1 M
Supply voltage Vcc(V)
Figure 10
Timing resistor Rt(Ω)
Ambient temperature vs. Frequcney variation ratio
30
10
Vcc=2V
CT=270PF
RT=3.0KΩ
5
0
5
-
-10
-15
-25
0
25
50
75
100
Ambient Temperature Ta (℃)
Figure 11
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. 0.9
10/18
FP5108
Timing Waveform
COMP pin
Short Circuit
Comparator Voltage
Idle Period
Voltage
Soft-start
setting voltage
OUTPUT
pin
Soft-start &
SCP pin
tpe
ts
Output
Short
Circuit
Output Short Circuit
Power On Soft-start
ON
CTL#
OFF
Short Circuit
Protection
Figure12. FP5108 Timing 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.
Website: http://www.feeling-tech.com.tw
Rev. 0.9
11/18
FP5108
Function Description
Voltage Reference
1.25V regulator operating from VCC is used to power the internal circuitry of the FP5108. An
internal resistive divider provides 0.5V reference for the error amplifier, Soft-start (typ. 0.9V) and SCP
(typ. 0.8V) circuits.
Error Amplifier
The error amplifier compares a sample of the DC-DC converter output voltage to the 0.5V
reference and generates an error signal for the PWM comparator. Output voltage of DC-DC converter
is setting with the resistor divider using the following expression (see figure 13)
R1
R2
VOUT 1
0.5
VOUT
R1
R2
Error Amplifier
FB
36K
500
0.5V
FP5108
COMP
C1
Figure13. Error Amplifier with Feedback Resistance Divider
Oscillator
The oscillator frequency can be set from 20KHz to 500KHz by connecting a resistor and a
capacitor at OSC pin of FP5108 to ground. The oscillator frequency can be determined by using the
graph shown in figure 9.
The oscillator output is a sawtooth wave with a minimum value of approximately 0.1V and a
maximum value of approximately 0.6V. The PWM comparator compares the oscillator voltage with
error amplifier output voltage; internal DTC voltage (typ. 0.6V) and soft start setting voltage. When the
sawtooth wave voltage is lower than above three-output voltage, the output of FP5108 is low (Driving
for PNP transistor or PMOS).
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. 0.9
12/18
FP5108
Under Voltage Lockout (UVLO)
The under voltage lockout circuits turn the output off and whenever the supply voltage drops too
low (approximately 0.9V at 25℃) for proper operation. A hysteresis voltage of 200mV eliminates false
triggering on noise and chattering.
Soft Start / Short-Circuit Protection (S.S. / S.C.P.)
The soft start is functional after power on, and the interval of soft start time is determined by a
capacitor connected to SCP pin (pin 2). When soft start function finished, the internal soft start voltage
is setting high, but external SCP pin is setting low in order to change to short circuit detection /
protection function.
The time of soft start is following expression:
Tss
ms
0.35 C F
The short circuit protection is functional due to a heavy loading drop and output of error amplifier
(COMP pin) is maintain a VPOS (typ. 0.87V), the capacitor is charged to SCP threshold voltage (typ.
0.8V), then FP5108 output is turn-off (internal pull-high) and the capacitor is discharged to low state.
Tscp
ms
0.8 C
F
Output Transistor
FP5108 will be shutdown immediately whenever COMP voltage is lower than 0.4V. The mean is
hard to maintain the output voltage during maximum duty cycle under short-circuit, and the PWM
output are off until power restart.
FP5108
4
CTL
R
CTL#
Q1
Figure14. Output Transistor Driving Control 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. 0.9
13/18
FP5108
CTL pin can also use to control the output of FP5108 for shutdown or re-start function of system.
CTL# Control Pin
Q1
Off
On
CTL Pin
High
Output Transistor Function
Mode
Low
Disable
Enable
Shutdown
Operation
High
Bias Current
Application Information
VIN +3.3V
VOUT +1.8V
Q1
L1 50µH
AP9620M
2
3
1
R7
20K
R1
2K
IC1
1
8
FB
COMP
OSC
R2
10k
2
7
6
C3
SCP
C1
0.1µF
0.1µF
R30
3
VCC
GND
OUT
C4
C2
C8
C7
D1
SCD34
330µF
330µF
0.1µF
330µF
5
4
BR / CTL
C5
FP5108
R4
220K
0.1µF
R5
3.9K
R6
10k
Q3
NPN3904
C6
270pF
VIN
ON / OFF Socket
R8 4.7k
1
2
SW1
Figure15. FP5108 Basic Buck Converter Circuits
For example:
The Vin is 3.3VDC, and Vout is 1.8V with 2.5A load.
The output voltage equation is:
R2
R5
10K
VOUT 1
V 1
0.5V 1.78V
FB
3.9K
The Soft-start time:
Tss 0.35C5 0.350.1 35ms
The SCP time:
Tscp 0.8 C5 0.80.1 80ms
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. 0.9
14/18
FP5108
Package Outline
SOP-8L
UNIT: mm
Symbols
Min. (mm)
1.346
0.101
1.244
9.804
3.810
5.791
0.406
0°
Max. (mm)
1.752
0.254
1.651
10.007
3.987
6.197
1.270
8°
A
A1
A2
D
E
H
L
θ°
Note:
1. Package dimensions are in compliance with JEDEC outline: MS-012 AC.
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.9
15/18
FP5108
SOP-8L (EP)
UNIT: mm
Symbols
Min. (mm)
1.346
Max. (mm)
1.752
0.152
1.498
4.978
3.987
6.197
1.270
8°
A
A1
A2
D
0.050
4.800
3.810
5.791
0.406
0°
E
H
L
θ°
Exposed PAD Dimensions:
Symbols
Min. (mm)
Max. (mm)
E1
D1
2.184 REF
2.971 REF
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 “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.
Website: http://www.feeling-tech.com.tw
Rev. 0.9
16/18
FP5108
TSSOP-8L
UNIT: mm
Symbols
Min. (mm)
Max. (mm)
1.200
A
A1
A2
D
0.050
0.960
2.900
0.150
1.060
3.100
E
6.400 BSC
E1
L
4.300
0.450
0°
4.500
0.750
8°
θ°
Note:
1. Package dimensions are in compliance with JEDEC outline: MO-153 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. 0.9
17/18
FP5108
MSOP-8L
UNIT: mm
4.
Symbols
Min. (mm)
Max. (mm)
1.100
A
A1
A2
D
0.000
0.750
0.150
0.950
3.000 BSC
4.900 BSC
3.000 BSC
E
E1
L
0.400
0°
0.800
8°
L1
θ°
0.950 REF
Note:
1. Package dimensions are in compliance with JEDEC outline: MO-187 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. 0.9
18/18
相关型号：
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