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參數(shù)資料
| 型號(hào)： | SP6653 |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Adjustable, High Efficiency, Low I Q , Step-Down DC-DC Converter(3V或可調(diào)電壓，高效，低I Q，步降DC-DC變換器) |
| 中文描述： | 可調(diào)，高效率，低智商，降壓型DC - DC轉(zhuǎn)換器（3V的或可調(diào)電壓，高效，低智商，步降型DC - DC變換器） |
| 文件頁(yè)數(shù)： | 8/13頁(yè) |
| 文件大小： | 82K |
| 代理商： | SP6653 |
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8
Rev. 2/23/01
SP6639/40/53 5/ 3.3/ 3V Adj, High Efficiency, Low I
Q
Step-Down DC-DC Converter Copyright 2001Sipex Corporation
P
When the output dips:
1)
The error comparator switches high.
2)
The internal oscillator starts and connects
to the gate of the LX output driver.
3)
LX turns on and off according to t
and
t
, charging and discharging the inductor,
and supplying current to the output (as
described above.)
When the output voltage recovers:
1)
The comparator switches low.
2)
After a full charge and discharge cycle, LX
turns off.
3)
The oscillator shuts down to save power.
Figure 3. Block Diagram
Fixed or Adjustable Output
For operation at the present output voltage,
connect VFB to GND; no external resistors are
required. For other output voltages, use an
external voltage divider. Set the output voltage
using R3 and R4 as determined by the following
formula.
R3 = R4 (V
OUT
/ VFB Threshold) – 1
where R4 is any resistance in the 10k
range
(typically 100k
), the LBI threshold is typi-
cally 1.28V.
Low-Battery Detector
The low battery detector compares the voltage
on the LBI input with the 1.28V reference. LBO
goes low whenever the input voltage at LBI is
less than 1.28V. Set the low-battery detection
voltage with resistors R1 and R2 (Figure 3) as
determined by the following formula:
R1 = R2 ( VLB/ LBI Threshold) – 1
where R2 is any resistance in the 10k
range
(typically 100k
), the LBI threshold is typi-
cally 1.28V and the VLB is the desired low-
battery detection voltage. The low-battery com-
parator remains active in shutdown mode.
Shutdown Mode
Bringing SHDN below 0.8V places the SP6639/
40/53 in shutdown mode. LX becomes high
impedance, and the voltage at VOUT falls to
zero. The time required for the output to rise to
its nominal regulated voltage when brought out
of shutdown (start-up time) depends on the
inductor value, input voltage, and load current
(see the Start-Up Time vs Output Current graph
in the Typical Operating Characteristics). The
low-battery comparator remains active in shut-
down mode.
INPUT +5.5V TO +11.5V (MAX639)
+3.8V TO 11.5V (MAX640). +3.5V TO 11.5V (MAX653)
C
IN
33
μ
F
+
R1
R2
2
3 LBI
LBO
LOW-BATTERY
+
COERROR
+
MODE-SELECT
RB+1.28V
FVAAND
DUTY-CYCLE
8
6
V
+
SHDN
L
X
5
5V, 3.3V, OR 3.0V
AT 100mA
1N5817
L = 100
μ
H
C
OUT
100
μ
F
+
V
OUT
1
GND
4
50mV+
-
VFB
7
-
-
+
-
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