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參數資料
| 型號： | ADP3804 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Secondary Over-Voltage Protection for 2-4 cell in series Li-Ion/Poly (4.50V) 8-TSSOP -40 to 110 |
| 中文描述： | 高頻開關模式鋰離子電池充電器 |
| 文件頁數： | 5/7頁 |
| 文件大小： | 89K |
| 代理商： | ADP3804 |
ADP3804
–5–
REV. PrI
Figure 1. Typical Application
T HE ORY OF OPE RAT ION
T he ADP3804 combines a boosted synchronous switching
driver with programmable current control and accurate final
battery voltage control in a Constant Current, Constant Volt-
age (CCCV) Li-Ion battery charger. High accuracy voltage
control is needed to safely charge Li-Ion batteries, which are
typically specified at 4.2 V ± 1% per cell. For a typical note-
book computer battery pack, three cells are in series giving a
total voltage of 12.6 V. T he ADP3804 is available in three
versions, a fixed 12.525 V output, a fixed 12.6 V output and an
adjustable output. T he adjustable output is useful for charging
batteries with slightly different chemistry that result in a final
battery voltage slightly higher or lower than 4.2 V/ cell.
Another requirement for safely charging Li-Ion batteries is
accurate control of the charge current. T he actual charge cur-
rent depends on the number of cells in parallel within the bat-
tery pack. T ypically this is in the range of 2 A to 3 A. T he
ADP3804 provides flexibility in programming the charge cur-
rent over a wide range. An external resistor is used to sense the
charge current and this voltage is compared to a DC input
voltage. T his programmability allows the current to be changed
during charging. For example, the charge current can be re-
duced for trickle charging.
T he synchronous driver provides high efficiency when charging
at high currents. Efficiency is important mainly to reduce the
amount of heat generated in the charger, but also to stay within
the power limits of the AC adapter. With the addition of a
boosted high side driver, the ADP3804 drives two external
power NMOS transistors for a simple, lower cost power stage.
T he ADP3804 also provides an uncommitted current sense
amplifier. T his amplifier provides an analog output pin for
monitoring the current through an external sense resistor. T he
amplifier can be used anywhere in the system that high side
current sensing is needed.
C harge C urrent C ontrol
AMP1 in Figure 1 has a differential input to amplify the voltage
drop across an external sense resistor R
CS
. T he input common
mode range is from ground to VCC allowing current control in
short circuit and low drop-out conditions. T he gain of AMP1 is
internally set to 25 V/V for low voltage drop across the sense
resistor. During CC mode, g
m1
forces the voltage at the output
of AMP1 to be equal to the external voltage at the ISET pin.
By choosing R
CS
and V
ISET
appropriately, a wide range of
charge currents can be programmed:
25
ISET
V
R
CHARGE
I
CS
(1)
BOOSTED
SYNCHRONOUS
DRIVER
VIN
CS+
OSCILLATOR
L1
VREF + VREG
UVLO
BIAS
+
CS-
R3
249
C13
22nF
COMP
REF
2.5V
AGND
BAT
SD
+
1
+
CT
SW
REG
6.0V
PGND
VCC
BST
SD
BATTERY
12.6V
7.0V
C10
0.1
μ
F
DRVH
DRVL
SYS+
SYS-
ISYS
+
ADJ
ISET
LOGIC
CONTROL
CCCV
SYNC
LIMIT
VREF
2.5V
SYSTEM
DC/DC
VREF
BSTREG
RSS1
10m
ADP3804
ADP3804-12.6
Q1
IRF7807
C15
220
μ
F
C14
2.2
μ
F
AMP
2
gm1
gm2
**R7
100k
* ADP3804-12.6: R11 = SHORT, R12 = OPEN
** R7, OPEN IF CCCV FUNCTION IS NOT USED
C17
100nF
C7
200pF
C6
200pF
R8
56
C8
1
μ
F
*R11
412k
0.1%
*R12
102k
0.1%
R2
10
R1
10
C16
220
μ
F
C9
0.1
μ
F
Q2
IRF7807D2
22
μ
H
RCS
50m
R4
249
R5
6.81k
R6
7.5k
ADP3804-12.5
R13
10
C2
470nF
C1
470nF
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| ADP3804JRU | Secondary Over-Voltage Protection for 2-4 cell in series Li-Ion/Poly (4.50V) 8-TSSOP -40 to 110 |
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| ADP3806JRU-12.6-RL | High-Frequency Switch Mode Li-Ion Battery Charger |
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| ADP3804JRU | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Frequency Switch Mode Li-Ion Battery Charger |
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| ADP3804JRU-126 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Frequency Switch Mode Li-Ion Battery Charger |
| ADP3806 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High-Frequency Switch Mode Li-Ion Battery Charger |
| ADP3806JRU | 制造商:AD 制造商全稱:Analog Devices 功能描述:High-Frequency Switch Mode Li-Ion Battery Charger |
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