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ADP3808JCPZ-RL Datasheet(PDF) 11 Page - Analog Devices

Part # ADP3808JCPZ-RL
Description  High Efficiency Switch Mode Li-Ion Battery Charger
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP3808JCPZ-RL Datasheet(HTML) 11 Page - Analog Devices

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ADP3808
Rev. 0 | Page 11 of 16
+
3-/4-CELL
SELECTION
BOOTSTRAPPED
SYNCHRONOUS
DRIVER
VIN
CSP
+
OSCILLATOR
L1
VREF + VREG
UVLO
BIAS
+
CSM
COMP
CHARGE
CURRENT
SETPOINT
BATTERY
VOLTAGE
ADJUST
AGND
CSADJ
BAT
EN
+
RT
SW
PGND
VCC
BST
BATTERY
12.6V/16.8V
7.0V
C10
0.1µF
DRV
SYSP
SYSM
ISYS
LIMSET
LOGIC
CONTROL
LIMIT
SYSTEM
DC/DC
ADP3808
1/2 Q1
FD56990A
C15
22µF
C14
2.2µF
150kΩ
R8
56Ω
C8
0.22µF
C11
C16
22µF
C9
100nF
1/2 Q1
FD56990A
22µH
RCS
20mΩ
R4
510Ω
R13
10Ω
DRVREG
CELLSEL
DRVLSD
IN
EN
VTH
DRVLSD
R2
510Ω
+
AMP2
+
C13
22µF
C1
2.2µF
RSS
10mΩ
AMP1
DRVL
+
gm1
BAT
1V
SYSP
REFIN
+
+
gm2
+
R9
3.3V
R10
3.3V
R11
3.3V
R12
BATADJ
EXTPWR
Figure 16. Typical Application Circuit
FINAL BATTERY VOLTAGE CONTROL
As the battery approaches its final voltage, the ADP3808
switches from CC mode to CV mode. The change is achieved
by the common output node of gm1 and gm2. Only one of the
two outputs controls the voltage at the COMP pin. Both
amplifiers can only pull down on COMP, such that when either
amplifier has a positive differential input voltage, its output is
not active. For example, when the battery voltage, VBAT, is low,
gm2 does not control VCOMP. When the battery voltage reaches
the desired final voltage, gm2 takes control of the loop, and the
charge current is reduced.
Amplifier gm2 compares the battery voltage to a programmable
level set by pins BATADJ and REFIN. The target battery voltage
is dependent on the state of the CELLSEL pin as CELLSEL sets
the number of cells to be charged. Pulling CELLSEL high sets
the ADP3808 to charge three cells. When CELLSEL is tied to
ground, four cells are selected. CELLSEL has a 2 μA pull-up
current as a fail-safe to select three cells when it is left open.
The final battery voltage is programmable from 4.0 V to 4.5 V
per cell. The programming voltage is applied to the BATADJ pin
and is ratioed to the REFIN pin. The battery voltage VBAT is set
according to Equation 2 and Equation 3.
For CELLSEL > 2 V:
REFIN
BATADJ
V
BAT
V
5
.
1
V
12 +
=
(2)
For CELLSEL < 0.8 V:
REFIN
BATADJ
V
BAT
V
2
V
16 +
=
(3)
OSCILLATOR AND PWM
The oscillator generates a triangle waveform between 1 V and
2 V, which is compared to the voltage at the COMP pin, setting
the duty cycle of the driver stage. When VCOMP is below 1.0 V,
the duty cycle is zero. Above 2.0 V, the duty cycle reaches its
maximum. The oscillator frequency is set by the external
resistor at the RT pin, ROSC, and is given by Equation 4.
OSC
OSC
R
f
9
10
41 ×
=
(4)


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