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AN-9720 Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part # AN-9720
Description  Power Path Implementation Tradeoffs
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

AN-9720 Datasheet(HTML) 2 Page - Fairchild Semiconductor

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AN-9720
APPLICATION NOTE
© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0 • 12/23/10
2
PWM
MODULATOR
Q1
Q2
Q1A
Q1B
ISNS
PMID
SW
PGND
PMID
L1
VBAT
CMID
+
Battery
CSIN
1 H
4.7 F
CBAT
SYSTEM
LOAD
VREF
SDA
SCL
OTG/USB#
VCC
VBUS
CBUS
1 F
STAT
I2C
INTERFACE
LOGIC
AND
CONTROL
POWER
OUTPUT
STAGE
PMID
OSC
30mA
COUT
0.1 F
RSENSE
Q3
CHARGE
PUMP
VBUS
OVP
I_IN
CONTROL
VREG
CREG
1 F
DAC
DISABLE
1.8V / PMID REG
Figure 2. FAN5400 Block Diagram
System and Battery Power Sharing
Power sharing between the system and the battery means that
power can be steered or prioritized to go to the system in the
case that the input power is not sufficient to power both the
system and charge the battery.
The typical configuration for the FAN5400, as shown in
Figure 3, is one where the system is connected in parallel to
the battery. The way in which this configuration can steer
power similar to power path is sometimes confusing, so
scenarios based on real-world battery capacity and input
power numbers are provided below.
Figure 3. Typical Application Circuit, System Parallel
with Battery
Example 1: 1500mAh Battery (1C Maximum Charge
Current Capability of Battery is 1500mA), Input
Power Source USB 2.0, 5V 500mA
Scenario A)
Partially charged battery at 3.6V and
system load turns on at 400mA
Before the system load turns on, the charger is already in CC
mode. Because the input power source is 5V 500mA and the
battery is at 3.6V, there is ~632mA of current available to
charge the battery. This is computed by accounting for the
charger conversion efficiency and also the output current
multiplication factor achieved when bucking down a voltage:
Efficiency
I
V
V
I
IN
OUT
IN
OUTMAX
=
/
(1)
Using
the
values
in
this
example
reveals
that
5V/3.6V•500mA•91%=632mA. The 91% efficiency data
point can be found in Figure 4.
84%
86%
88%
90%
92%
94%
2.5
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
Battery Voltage, VBAT (V)
4.5VBUS
5.0VBUS
5.5VBUS
Figure 4.
FAN5400 Conversion Efficiency vs.
Battery Voltage vs. VBUS Voltage


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