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參數(shù)資料
| 型號(hào)： | ADP3604AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Secondary Over-Voltage Protection for 2-4 cell in series Li-Ion/Poly (4.45V) 8-SM8 -40 to 110 |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 140 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 143K |
| 代理商： | ADP3604AR |
ADP3604
REV. 0
–6–
T he output current is supplied solely by the output capacitor
C3 during one-half of the charge-pump cycle. T his introduces a
peak-to-peak ripple of:
V
RIPPLE
=
I
L
2
×
120
kHz
×
C
3
+
I
L
×
ESR
C
3
For a nominal F pump of 120 kHz (one-half the nominal 240 kHz
oscillator frequency) and C3 = 10
μ
F with an ESR of 0.15
,
ripple voltage is approximately 60 mV with a 120 mA load
current.
Multilayer Ceramic Capacitors (MLCC) offer great perfor-
mance and small size. Using multiple capacitors connected in
parallel yields lower ESR and a potential saving in cost. Lighter
loads require proportionally smaller capacitors. T o reduce high
frequency noise, bypass the output with a 0.1
μ
F ceramic
capacitor.
ADP3604
8
7
3
C2
4.7μF
1
4
V
IN
+4.5 – +6V
V
OUT
–3.0V
C3
4.7μF
2
5
SENSE
INPUT
L1
10μH
C4
4.7μF
C1
4.7μF
Figure 17. Circuit with Improved Output Ripple & Noise
Voltage
T able III. Recommended Components for Circuit in Figure 17
Component
Manufacturer/T ype
C2
C1, C3, C4
L1
Sprague, 293D475X 0035D2W
T OK IN, 1E475ZY5U-C205-F
Coiltronics, CT X 32CT
E X T E RNAL INPUT FILT E RING
If the ADP3604 is supplied from an high-impedance source,
connect an additional bypass capacitor from V+ to ground.
Low-ESR capacitors of up to 100
μ
F give best results. Place
external capacitors close to the supply pins of the device with
the ground connection made as close to the device ground as
possible. T he same ground point should be used for the output
bypass capacitor.
Smaller bypass capacitors can be used in conjunction with a
π
-LC filter.
ADP3604
8
7
3
C3
4.7μF
1
4
V
IN
+4.5 – +6V
V
OUT
–3.0V
C4
4.7μF
2
5
SENSE
INPUT
L2
10μH
C5
4.7μF
C2
4.7μF
L1
1μH
C1
4.7μF
Figure 18. Circuit with Reduced Input and Output Ripple
& Noise Voltage
T able IV. Recommended Components for Circuit in Figure 18
Component
C3
C1, C2, C4, C5
L1
L2
Manufacturer/T ype
Sprague, 293D475X 0035D2W
T OK IN, 1E475ZY5UC205F
Coiltronics, CT X 32CT -1R0
Coiltronics, CT X 32CT -100
SHUT DOWN MODE
ADP3604’s output can be turned off by utilizing the shutdown
pin, Pin 4. Pulling the shutdown pin high to a T T L/CMOS
logic compatible level will stop the internal oscillator and turn
OFF the output pass transistor. A digital low level will turn the
output ON. If the shutdown feature of the device is not used,
Pin 4 should be tied to the ground pin of the device.
MAX IMUM OUT PUT VOLT AGE
Maximum unregulated output voltage can be obtained by con-
necting the sense pin to ground instead of the V
OUT
pin as
shown in Figure 19.
Under this condition, the magnitude of the unregulated output
voltage depends on the load current. V
OUT
is inversely propor-
tional to the load current as shown on the graph in Figure 19.
LOAD CURRENT – mA
–5.0
–4.0
10
90
V
O
30
50
70
–3.0
ADP3604
8
7
3
1
4
V
IN
= 5.0V
2
5
Figure 19. Maximum Unregulated Output Voltage
Under light loads, 30 mA < I
LOAD
, a regulated output voltage
between –3.0 V to –V
IN
V is possible by inserting a resistor be-
tween the sense pin and the V
OUT
pin as shown in Figure 20.
T he output voltage is approximated using the following formula:
V
OUT
= –(3 +
R
/5)
where
V
OUT
is in volts and
R
is in k
s.
LOAD CURRENT – mA
–5.0
–4.0
10
90
V
O
30
50
70
–3.0
ADP3604
8
7
3
1
4
V
IN
= 5.0V
2
5
V
OUT
R
R = 10k
V
R = 5k
V
110
Figure 20. Maximum Regulated Output Voltage
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