FP6366S5P [FITIPOWER]
1.5MHz, 600mA, High-Efficiency PWM Synchronous Step-Down Converter;
| 型号： | FP6366S5P |
| 厂家： | 
Fitipower |
| 描述： | 1.5MHz, 600mA, High-Efficiency PWM Synchronous Step-Down Converter |
| 文件： | 总9页 (文件大小：525K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
fitipower integrated technology lnc.
1.5MHz, 600mA, High-Efficiency PWM
Synchronous Step-Down Converter
Description
Features
The FP6366 is a high efficiency, low-noise, DC-DC
step-down pulse width modulated (PWM) converter
that goes automatically into PFM mode at light load
to improve efficiency. It is ideally suitable for
systems powered from a 1-cell Li-ion battery or from
a 2 to 3-cell NiCd, NiMH or alkaline battery. The
100% duty cycle feature provides low dropout
operation, extending battery life in portable systems.
Switch frequency is internally set at 1.5MHz, allowing
use of small surface mount inductors and capacitors.
Synchronous Rectification:
Approach 95% Efficiency
2.5V to 5.5V Input Voltage Range
The PFM Mode Operation for Improving
Efficiency at Light Load
Real Shutdown Isolated Load from Battery
Internal Compensation without External
Capacitors and Resistors
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Fixed Frequency Operation at 1.5MHz
Low Quiescent Current at 35µA
Low Shutdown Current at 1µA
RoHS Compliant
The internal synchronous switch increases efficiency
and eliminates the need for external Schottky diode.
Shutdown mode places the device in standby,
reducing quiescent supply current to less than 1µA.
The FP6366 is available in a small SOT-23-5
package.
Applications
Cellular Phone
Handheld Instrument
Wireless LAN
MP3 Portable Audio Player
Battery Operated Device
Pin Assignments
Ordering Information
FP6366□□□
S5 Package (SOT-23-5)
TR: Tape/Reel
FB
VIN
P: Green
G: Green
5
1
4
3
Package Type
S5: SOT-23-5
2
RUN GND SW
SOT-23-5 Marking
Figure 1. Pin Assignment of FP6366
Part Number
FP6366S5P
FP6366S5G
Product Code
D0
D0=
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Typical Application Circuit
L1
4
3
5
VIN
VOUT
1.8V
VIN
SW
FB
10µH
2.5V to 5.5V
CF
COUT
10µF
CIN
10µF
68pF
1
RUN
R2
300K
R1
150K
GND
2
Figure 2. Typical Application Circuit of FP6366
Functional Pin Description
Pin Name
Pin Function
Enable Pin. Logic high enables the converter, and logic low forces the device into shutdown mode for reducing
the supply current to less than 1µA.
RUN
GND
SW
VIN
FB
Ground.
Inductor connection to the drains of the internal power MOSFETs.
Supply Voltage Input. Input range from 2.5V to 5.5V. Bypass with a 10µF capacitor.
Feedback Input.
Block Diagram
RUN
VIN
Enable
Control
Slope Compensation
Soft
Start
PWM / PFM
Control Logic
& Current Limit
Logic
Control
and
Driver
Logic
X
1
COMP
FB
SW
EA
Mode
Compensation
Control
Oscillator
VREF
COMP
GND
GND
Figure 3. Block Diagram of FP6366
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Absolute Maximum Ratings
● VIN to GND ---------------------------------------------------------------------------------------------------- -0.3V to +6V
● SW to GND ---------------------------------------------------------------------------------------------------- -0.3V to (Vin+0.3V)
● RUN, FB to GND --------------------------------------------------------------------------------------------- -0.3V to Vin
●Power Dissipation @TA=25°C, (PD)
SOT-23-5 ------------------------------------------------------------------------------------------ +400mW
● Package Thermal Resistance, (θJA)
SOT-23-5 ------------------------------------------------------------------------------------------ +250°C/W
● Package Thermal Resistance, (θJC)
SOT-23-5 ------------------------------------------------------------------------------------------ +130°C/W
● Maximum Junction Temperature (TJ) ------------------------------------------------------------------- +150°C
● Storage Temperature (TSTG) ------------------------------------------------------------------------------- -65°C to +150°C
● Lead Temperature (Soldering, 10sec.) ----------------------------------------------------------------- +260°C
Note 1：Stresses beyond those listed under “Absolute Maximum Ratings" may cause permanent damage to the device.
Recommended Operating Conditions
● Supply Voltage (VIN) ----------------------------------------------------------------------------------------- +2.5V to +5.5V
● Operation Temperature Range (TOPR) ------------------------------------------------------------------- -40°C to +85°C
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Electrical Characteristics
(VIN=3.6V, RUN=VIN, TA=25ºC, unless otherwise specified)
Parameter
Operating Input Voltage
Output Voltage Range
Symbol
VIN
Conditions
Min.
2.5
Typ.
Max.
5.5
VIN
400
35
Unit
V
VO
0.8
V
VFB=0.5V or VOUT=90%, IO=0mA
300
20
Supply Current
ISUP
µA
VFB=0.62V or VOUT=103%,
IO=0mA
Shutdown Current
ISD
VIH
RUN=GND
0.1
1
µA
V
RUN High-Level Input Voltage
RUN High-Low Input Voltage
RUN Input Leakage Current
1.3
VIL
0.4
0.1
V
ILKG
RUN=GND or VIN
ISW = 100mA
0.01
450
µA
mΩ
N-Channel MOSFET
On-Resistance (Note2)
P-Channel MOSFET
On-Resistance (Note2)
RDS(ON)
500
RDS(ON)
fS
ISW = 100mA
450
1500
1.1
500
1800
1.25
mΩ
KHz
A
Oscillator Frequency
P-Channel Current Limit (Note2)
Reference Voltage
1200
0.75
ILIM
VFB=0.5V
VREF
0.588
0.6
0.612
V
Line Regulation
△ VLINE
△ VLOAD
VIN =VO+0.5V to 5.5V; IO = 10mA
IO = 10mA to 600mA
0.05
0.5
% / V
%
Load Regulation
Note 2：Guarantee by design.
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Typical Performance Curves
1.81
1.80
1.79
1.78
1.77
VIN=2.7V
90
80
70
60
50
40
30
20
10
0
VIN=5V
VIN=3.6V
VIN=3.6V
VOUT=1.8V
0
100
200
300
400
500
600
700
0.1
1
10
100
1000
Load Current (mA)
Load Current (mA)
Figure 4. Efficiency vs. Load Current
Figure 5. Output Voltage vs. Output Current (VIN=3.6V)
1.60
1.58
1.56
1.54
1.52
1.50
1.48
1.46
1.44
1.42
1.40
0.620
0.615
0.610
0.605
0.600
0.595
0.590
0.585
0.580
-40
-20
0
20
40
60
80
Junction Temperature (oC)
-40
-20
0
20
40
60
80
Junction Temperature (oC)
Figure 6. Reference Voltage vs. Junction Temperature
Figure 7. Frequency vs. Junction Temperature
34
32
30
1.60
1.55
1.50
1.45
1.40
28
VIN=5V
26
VIN=3.6V
24
VIN=2.5V
22
20
18
-40
-20
0
20
40
60
80
2.5
3.0
3.5
4.0
4.5
5.0
Junction Temperature (oC)
Input Voltage (V)
Figure 8. Frequency vs. Input Voltage
Figure 9. Quiescent Current vs. Junction Temperature
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Typical Performance Curves (Continued)
40
35
30
25
20
15
10
CH1: SW
CH2: Output Voltage, AC-Coupled
CH4: Inductor Current
2.5
3.0
3.5
4.0
4.5
5.0
Input voltage(V)
VIN=3.6V, VOUT=1.8V, L=10μH, COUT=10μF+0.1μF, ILOAD=20mA
Figure 10. Quiescent Current vs. Input Voltage
Figure 11. Light Load Waveform
CH1: SW
CH1: SW
CH2: Output Voltage, AC-Coupled
CH4: Load Current
CH2: Output Voltage, AC-Coupled
CH4: Load Current
VIN=3.6V, VOUT=1.8V, L=10μH, COUT=10μF+0.1μF,
ILOAD=1mA to 600mA
VIN=3.6V, VOUT=1.8V, L=10μH, COUT=10μF+0.1μF,
ILOAD=20mA to 600mA
Figure 12. Load Transient Response
Figure 13. Load Transient Response
CH1: SW
CH1: SW
CH2: Output Voltage, AC-Coupled
CH2: Output Voltage, AC-Coupled
CH4: Load Current
CH4: Load Current
VIN=3.6V, VOUT=1.8V, L=10μH, COUT=10μF+0.1μF,
VIN=3.6V, VOUT=1.8V, L=10μH, COUT=10μF+0.1μF,
ILOAD=200mA to 600mA
ILOAD=100mA to 600mA
Figure 14. Load Transient Response
Figure 15. Load Transient Response
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Typical Performance Curves (Continued)
CH1: RUN
CH2: VOUT
CH4: Load Current
VIN=3.6V, VOUT=1.8V, L=10μH, COUT=10μF+0.1μF, ILOAD=600mA
Figure 16. Start-up Waveform
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Application Information
Inductor Selection
Checking Transient Response
8.2µH~10µH is recommended for general used.
The value of inductor depends on the operating
The regulator loop response can be checked by
looking at the load transient response. Switching
regulators take several cycles to respond to a step
in load current. When a load step occurs, VOUT
frequency.
Higher frequency allows smaller
inductor and capacitor but increases internal
switching loss. Two inductor parameters should be
considered, current rating and DCR. The inductor
with the lowest DCR is chosen for the highest
efficiency. The inductor value can be calculated as:
immediately shiꢆts by an amount equal to (ΔꢉLOAD
ESR), where ESR is the effective series resistance
of COUT ΔꢉLOAD also begins to charge or discharge
•
.
COUT, which generates a feedback error signal.
The regulator loop then acts to return VOUT to its
steady state value. During this recovery time, VOUT
can be monitored for overshoot or ringing that would
indicate a stability problem.
ꢂꢃꢄꢅ
ꢆꢇꢈꢉꢀ
ꢂ
ꢃꢄꢅꢀ
ꢀꢁ
ꢊꢋ
ꢂꢉꢌ
ꢈIL: inductor ripple current, which is defined as:
The discharged bypass capacitors are effectively
put in parallel with COUT, causing a rapid drop in
ꢂ
ꢂ
ꢃ
ꢄ
ꢁ
ꢈꢉꢀꢍꢂꢃ ꢊꢋ
ꢃꢀ
ꢎ ꢀꢇꢆ
VOUT
.
No regulator can deliver enough current to
(General Setting)
ꢂꢉ
ꢅꢅꢅꢅꢅꢅꢅꢏꢐ.ꢊꢇꢑꢇꢉꢃꢋMAꢒ
prevent this problem if the load switch resistance is
low and driven quickly. The only solution is to limit
the rise time of the switch drive so that the load rise
time is limited to approximately (ꢑ5 • ꢖLOAD).
The inductor should be rated for the maximum output
current (IO-MAX) plus the inductor ripple current (ꢈꢉL) to
avoid saturation. The maximum inductor current
(IL-MAX) is given by:
Current Mode PWM Control
Slope compensated current mode PWM control
provides stable switching and cycle-by-cycle current
limit for superior load, line response, protection of
the internal main switch and synchronous rectifier.
The FP6366 switches at a constant frequency
(1.5MHz) and regulates the output voltage. During
each cycle the PWM comparator modulates the
power transferred to the load by changing the
inductor peak current based on the feedback error
voltage. During normal operation, the main switch
is turned on for a certain time to ramp the inductor
current at each rising edge of the internal oscillator,
and switched off when the peak inductor current is
above the error voltage. When the main switch is
off, the synchronous rectifier will be turned on
immediately and stay on until next cycle starts.
ꢈꢉꢀ
ꢉꢀꢋMAꢒꢍꢉꢃꢋMAꢒ
Capacitor Selection
ꢓ
ꢑ
The small size of ceramic capacitors are ideal for
FP6366 applications. X5R and X7R types are
recommended because they retain their capacitance
over wider voltage and temperature ranges than
other types such as Y5V or Z5U. A ꢊꢐμF input
capacitor and a ꢊꢐμF output capacitor are suꢆꢆicient
for most FP6366 applications.
When selecting output capacitor, consider the output
ripple voltage and the ripple current. The ESR of
capacitor is a major factor to the output ripple. For
the best performance, a low ESR output capacitor is
required. The ripple voltage is given by:
ꢊ
Dropout Operation
ꢀ
ꢈꢂꢃꢍꢈꢉꢀ ꢔSRꢓ
The FP6366 allows the main switch to remain on for
more than one switching cycle and increases the
duty cycle while the input voltage is dropping close
ꢕꢇꢆꢇꢖꢃ
Output Voltage Programming
to the output voltage.
When the duty cycle
The output voltage of FP6366 is set by using the
resistor divider according to the following formula:
reaches 100%, the main switch will be held on
continuously to deliver current to the output up to
the MOSFET current limit. Then the output voltage
will be the input voltage minus the voltage drop
across the main switch and the inductor.
Rꢑ
ꢀ
ꢂꢃꢄꢅꢍꢂFꢗꢇ ꢊꢓ
Rꢊ
R2 is the upper resistor of the voltage divider. For
transient response reasons, a small feed-forward
capacitor (CF) is required in parallel to the upper
feedback resistor, and 68pF is recommended.
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Outline Information
SOT-23-5 Package (Unit: mm)
DIMENSION IN MILLIMETER
SYMBOLS
UNIT
MIN
0.90
0.00
0.90
0.30
2.80
2.60
1.50
0.90
1.80
0.30
MAX
1.45
0.15
1.30
0.50
3.00
3.00
1.70
1.00
2.00
0.60
A
A1
A2
B
D
E
E1
e
e1
L
Note：Followed From JEDEC MO-178-C.
Carrier Dimensions
Life Support Policy
Fitipower’s products are not authorized ꢆor use as critical components in liꢆe support devices or other medical systems.
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