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参数资料
| 型号： | ADP3802AR |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 电源管理 |
| 英文描述： | Secondary Over-Voltage Protection for 2-4 cell in series Li-Ion/Poly (4.50V) 8-SM8 -40 to 110 |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | SOIC-16 |
| 文件页数： | 12/20页 |
| 文件大小： | 256K |
| 代理商： | ADP3802AR |
ADP3801/ADP3802
–12–
REV. 0
SD
results in shutdown. All internal circuitry is shut off except
for the LDO and the reference, and the supply current is typi-
cally 110
μ
A. When
SD
returns high, the part resumes full op-
eration. The compensation capacitor at the COMP node is
discharged during shutdown, so the part will resume operation
in soft-start mode.
Undervoltage Lockout—UVLO
The internal Undervoltage Lockout (UVLO) circuit monitors
the input voltage and keeps the part in shut-down mode until
VCC rises above 3.9 V. During UVLO, the LDO and reference
are still active, but the analog front end, the oscillator, and the
gate drive are off. UVLO helps to prevent the circuitry from
entering an unknown state that could incorrectly charge a battery.
To prevent oscillation around VCC = 3.9 V, the UVLO cir-
cuitry has built-in hysteresis. Once the part is on, the UVLO
circuitry does not shut it off until the LDO enters dropout.
Because the dropout voltage depends on the LDO’s load, the
UVLO trip point-off also depends on the load. Refer to Figure 8
for a graph of the UVLO trip point-off versus LDO load.
RESET
When the power is first applied to the ADP3801/ADP3802, the
RESET
pin is held at ground by an external 1 M
resistor. It
remains low until the LDO output voltage rises to above 80% of
its final value. When this threshold is reached, the
RESET
pin is
pulled high. The internal
RESET
comparator includes about
150 mV of hysteresis to avoid oscillation around the threshold.
Supply Considerations
The guaranteed operating supply voltage range of the ADP3801/
ADP3802 is from 4 V to 20 V, and it typically consumes 5.0 mA
of quiescent current when not switching. However, the part
needs at least 2 V of headroom between VCC and the voltage
on the CS+ and CS– pins. This is for the common-mode range
on the current sense amplifier. In applications where the input
supply does not offer enough headroom, the circuits in Figures
32 and 33 can be used as explained in the section on low over-
head charging.
Overtemperature Shutdown
The ADP3801/ADP3802 has an on-chip temperature detector
to shut the part down when the die temperature reaches typi-
cally +160
°
C. Such a condition could occur with a short-circuit
on the LDO or a short on the DRV pin. In either case, the op-
eration of the charger will stop and the DRV pin will be pulled
high. With approximately +10
°
C hysteresis, the overtemperature
shutdown releases at typically +150
°
C. These temperatures are
higher than the absolute maximum ratings for the die, and are
included as a safety feature only.
Li-Ion Battery Charger
The ADP3801 and ADP3802 are ideally suited for a single or
dual Li-Ion batterypack charger. They combine 200kHz or
500 kHz switching with a PMOS pass transistor drive to realize
a Buck topology CCCV charger. The following discussion goes
through the complete design of a charger using the ADP3801.
This information also applies to the ADP3802.
Charger Specifications
Battery: 3 Series Cell Li-Ion Pack.
Input Voltage: V
IN
= 15 V dc to 20 V dc.
Final Battery Voltage: V
BAT
= 12.6 V.
Charge Current: I
CHARGE
= 4.0 A (for V
O
= 0 V to 12.6 V)
Circuit Topology
The complete Buck charger circuit is shown in Figure 24. The
dc-source voltage can be supplied from an ac/dc adaptor or an
external dc/dc supply.
V
IN
MBRD835
R
CS
40m
V
BATA
12.6V
MAX
TOP VIEW
(Not to Scale)
DRV
VL
SD
CS–
CS+
GND
A/B
BATA
BATB
PROG
ADJ
EOC
COMP
ADP3801/
ADP3802
VCC
RESET
0.1
m
F
210
m
F
25V
1k
V
140
m
F
25V
4.3k
V
4.3k
V
C7
2.2nF
C9
2.2nF
MBRD835
ISET
100k
V
SD
VL = +3.3V
4.7
m
F
100k
V
24k
V
20k
V
1.0
m
F
EOC
1M
V
RESET
(+15V TO +20V)
33
m
H
Si4463
56
V
100k
V
200k
V
Figure 24. Li
-
Ion Battery Charger
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