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參數(shù)資料
| 型號(hào)： | ADP3806JRU-12.6-RL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 電源管理 |
| 英文描述： | High-Frequency Switch Mode Li-Ion Battery Charger |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24 |
| 封裝： | MO-153AD, TSSOP-24 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大?。?/td> | 274K |
| 代理商： | ADP3806JRU-12.6-RL |
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REV. B
ADP3806
–9–
THEORY OF OPERATION
The ADP3806 combines a bootstrapped synchronous switching
driver with programmable current control and accurate final
battery voltage control in a constant-current, constant-voltage
(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 notebook computer
battery pack, three or four cells are in series giving a total volt-
age of 12.6 V or 16.8 V. The ADP3806 is available in three
versions, a selectable 12.525 V/16.7 V output, a selectable
12.6 V/16.8 V output, and an adjustable output. The adjustable
output can be programmed for a wide range of battery voltages
using two external precision resistors.
Another requirement for safely charging Li-Ion batteries is
accurate control of the charge current. The actual charge cur-
rent depends on the number of cells in parallel within the
battery pack. Typically, this is in the range of 2 A to 3 A. The
ADP3806 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 volt-
age. This programmability allows the current to be changed
during charging. For example, the charge current can be reduced
for trickle charging.
The 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 bootstrapped high
side driver, the ADP3806 drives two external power NMOS
transistors for a simple, lower cost power stage.
The ADP3806 also provides an uncommitted current sense
amplifier. This amplifier provides an analog output pin for
monitoring the current through an external sense resistor. The
amplifier can be used anywhere in the system that high side
current sensing is needed.
Charge Current Control
AMP1 in Figure 1 has a differential input to amplify the voltage
drop across an external sense resistor RCS. The input common-
mode range is from ground to VCC, allowing current control in
short circuit and low dropout conditions. The gain of AMP1 is
internally set to 25 V/V for low voltage drop across the sense
resistor. During CC mode, g
m
1 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.
I
V
R
CHARGE
REF
￥
CS
=
25
(1)
–
+
SELECT
12.6/16.8
BOOTSTRAPPED
SYNCHRONOUS
DRIVER
SD
IN DRVLSD
VIN
CS+
–
+
OSCILLATOR
L1
VREF + VREG
UVLO
BIAS
+
CS–
R3
249
COMP
REF
2.5V
AGND
BAT
SD
+
–
CT
SW
REG
6.0V
PGND
VCC
BST
BATTERY
12.6V/16.8V
C10
0.1 F
DRVH
DRVL
SYS+
SYS–
ISYS
ISET
LOGIC
CONTROL
LC
SYNC
LIMIT
VREF
2.5V
SYSTEM
DC/DC
VREF
ADP3806
1/2 Q1
FD56990A
C15
22 F
C14
2.2 F
**
R7
100k
*
ADP3806-12.6, ADP3806-12.5: R11 = SHORT, R12 = OPEN;
ADP3806, R11 = 412k , R12 = 102k , R14 = OPEN.
**
R7, OPEN IF LC FUNCTION IS NOT USED.
C17
100nF
C7
200pF
C6
180pF
R8
56
C8
0.22 F
*
R11
412k
0.1%
*
R12
102k
0.1%
R1
2.2
C13
22nF
C16
22 F
C9
100nF
1/2 Q1
FD56990A
22 H
R
CS
40m
R4
249
R5
6.81k
R6
7.5k
R13
10
C2
470nF
C1
470nF
BS7.0V
BATSEL
VTH
DRVLSD
*
R14
0
R2
2.2
–
–
+
–
+
–
+
–
+
gm1
gm2
R
SS
10m
+
–
Figure 1. Typical Application
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