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PDF FAN4860 Data sheet ( Hoja de datos )
| Número de pieza | FAN4860 | |
| Descripción | 5V Output Synchronous TinyBoost Regulator | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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April 2010
FAN4860
3MHz, 5V Output Synchronous TinyBoost™ Regulator
Features
Operates with Very Small External Components:
1μH Inductor and 0402 Case Size Input and Output
Capacitors
Input Voltage Range from 2.3V to 4.5V
Fixed 5.0V Output Voltage
Maximum Load Current 200mA at VIN=2.3V
Maximum Load Current 300mA at VIN=3.3V
Up to 92% Efficient
Low Operating Quiescent Current
True Load Disconnect During Shutdown
Variable On-time Pulse Frequency Modulation (PFM) with
Light-Load Power-Saving Mode
Internal Synchronous Rectifier
(No External Diode Needed)
Thermal Shutdown and Overload Protection
6-Pin 2 x 2mm UMLP
6-Bump WLCSP, 0.4mm Pitch
Applications
USB “On the Go” 5V Supply
HDMI 5V Supply
5V Supply for H-Bridge Motor Drivers
Powering 5V Peripherals
Supply Source for WLED Torch and Flash Lighting
PDAs, Portable Media Players
Cell Phones, Smart Phones, Portable Instruments
Description
The FAN4860 is a low-power boost regulator designed to
provide a regulated 5V output from a single cell Li-Ion
battery. The output voltage is fixed at 5.0V with a guaranteed
maximum load current of 200mA at VIN=2.3V and 300mA at
VIN=3.3V. Input current in shut-down mode is less than 1µA,
which maximizes battery life.
Light-load PFM operation is automatic and “glitch-free”. The
regulator maintains output regulation at no-load with 37µA
quiescent current.
The combination of built-in power transistors, synchronous
rectification, and low supply current make the FAN4860 ideal
for battery powered applications.
The FAN4860 is available in 6-bump 0.4mm pitch Wafer-
Level Chip Scale Package (WLCSP) and a 6-lead 2x2mm
ultra-thin MLP package.
Figure 1. Typical Application
Ordering Information
Part Number
FAN4860UC5X
FAN4860UMP5X
Operating Temperature Range
-40°C to 85°C
-40°C to 85°C
Package
WLCSP, 0.4mm Pitch
UMLP-6, 2 x 2mm
Please refer to tape and reel specifications at http://www.fairchildsemi.com/packaging.
Packing Method
Tape and Reel
Tape and Reel
© 2009 Fairchild Semiconductor Corporation
FAN4860 • Rev. 1.0.3
www.fairchildsemi.com
1 page  
Typical Characteristics
Unless otherwise specified, circuit per Figure 1, 3.6VIN, TA=25°C.
100
95
95 92
90
85
80
75
0
50
25
0
50 100 150 200
Load Current (mA)
Figure 6 Efficiency vs. VIN
2.5 Vin
3.3 Vin
3.6 Vin
4.5 Vin
250 300
2.5 Vin
3.3 Vin
3.6 Vin
4.5 Vin
-25
-50
-75
-100
0
4000
50 100 150 200 250
Load Current (mA)
Figure 8 Line and Load Regulation
300
89
86
83
80
0
50 100 150 200
Load Current (mA)
-40C
+25C
+85C
250 300
Figure 7 Efficiency vs. Temperature, 3.6VIN
50
-40C
+25C
25 +85C
0
-25
-50
-75
-100
0
50 100 150 200 250 300
Load Current (mA)
Figure 9 Load Regulation vs. Temperature, 3.6VIN
3200
2400
1600
800
0
0
2.5 Vin
3.6 Vin
4.5 Vin
50 100 150 200
Load Current (mA)
Figure 10 Switching Frequency
250
300
Figure 11 Quiescent Current
© 2009 Fairchild Semiconductor Corporation
FAN4860 • Rev. 1.0.3
5
www.fairchildsemi.com
5 Page 
Application Information
External Component Selection
Table 2 shows the recommended external components for
the FAN4860:
Table 2. External Components
REF Description
Manufacturer
L1
1.0µH, 0.8A, 190mΩ, Murata LQM21PN1R0MC0,
0805
or equivalent
CIN
2.2µF, 6.3V, X5R,
0402
Murata GRM155R60J225M
TDK C1005X5R0J225M
COUT
4.7µF, 10V, X5R,
0603(3)
Kemet C0603C475K8PAC
TDK C1608X5R1A475K
Note:
3. A 6.3V-rated 0603 capacitor may be used for COUT,
such as Murata GRM188R60J225M. All datasheet
parameters are valid with the 6.3V-rated capacitor.
Due to DC bias effects, the 10V capacitor offers a
performance enhancement; particularly output ripple
and transient response, without any size increase.
Output Capacitance (COUT)
Stability
The effective capacitance (CEFF) of small, high-value,
ceramic capacitors decrease as their bias voltage increases,
as shown in Figure 30.
Figure 30. CEFF for 4.7μF, 0603, X5R, 6.3V
(Murata GRM188R60J475K)
FAN4860 is guaranteed for stable operation with the
minimum value of CEFF (CEFF(MIN)) outlined in Table 3.
Table 3. Minimum CEFF Required for Stability
Operating Conditions
VIN (V)
ILOAD (mA)
CEFF(MIN) (μF)
2.3 to 4.5
0 to 200
1.5
2.7 to 4.5
0 to 200
1.0
2.3 to 4.5
0 to 150
1.0
CEFF varies with manufacturer, dielectric material, case size,
and temperature. Some manufacturers may be able to
provide an X5R capacitor in 0402 case size that retains CEFF
>1.5μF with 5V bias; others may not. If this CEFF cannot be
economically obtained and 0402 case size is required, the IC
can work with the 0402 capacitor as long as the minimum VIN
is restricted to >2.7V.
For best performance, a 10V-rated 0603 output capacitor is
recommended (Kemet C0603C475K8PAC, or equivalent).
Since it retains greater CEFF under bias and over
temperature, ouptut ripple can is reduced and transient
capability enhanced.
Output Voltage Ripple
Output voltage ripple is inversely proportional to COUT.
During tON, when the boost switch is on, all load current is
supplied by COUT.
VRIPPLE(P −P)
=
t ON
•
ILOAD
COUT
and
EQ. 2
t ON
=
t SW
•D
=
t SW
• ⎜⎜⎝⎛1−
VIN
VOUT
⎟⎟⎠⎞
Therefore:
EQ. 3
VRIPPLE(P −P)
=
t SW
• ⎜⎜⎝⎛1−
VIN
VOUT
⎟⎟⎠⎞ •
ILOAD
COUT
where:
EQ. 4
tSW = 1fSW
EQ. 5
As can be seen from EQ. 4, the maximum VRIPPLE occurs
when VIN is minimum and ILOAD is maximum.
Startup
Input current limiting is in effect during soft-start, which limits
the current available to charge COUT. If the output fails to
achieve regulation within the time period described in the
soft-start section above; a FAULT occurs, causing the circuit
to shut down, then restart after a significant time period. If
COUT is a very high value, the circuit may not start on the first
attempt, but eventually achieves regulation if no load is
present. If a high-current load and high capacitance are both
present during soft-start, the circuit may fail to achieve
© 2009 Fairchild Semiconductor Corporation
FAN4860 • Rev. 1.0.3
11
www.fairchildsemi.com
11 Page | ||
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| PDF Descargar | [ Datasheet FAN4860.PDF ] | |
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