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參數(shù)資料
| 型號： | LTC1516 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower, Regulated 5V Charge Pump DC/DC Converter |
| 中文描述： | 微功耗，電壓5V充電泵DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 105K |
| 代理商： | LTC1516 |
6
LTC 1516
APPLICATIO
S I
FOR
ATIO
U
Ultralow Quiescent Current (I
Q
< 5
μ
A) Regulated
Supply
W
U
U
The LTC1516 contains an internal resistor divider (refer to
Block Diagram) which draws only 1.5
μ
A (typ) from V
OUT
.
During no-load conditions, the internal load causes a
droop rate of only 150mV per second on V
OUT
with
C
OUT
= 10
μ
F. Applying a 5Hz to 100Hz, 95% to 98% duty
cycle signal to the SHDN pin ensures that the circuit of
Figure 3 comes out of shutdown frequently enough to
maintain regulation during no-load or low-load condi-
tions. Since the part spends nearly all of its time in
shutdown, the no-load quiescent current (see Figure 4a) is
approximately equal to (V
OUT
)(1.5
μ
A)/(V
IN
)(Efficiency).
The LTC1516 must be out of shutdown for a minimum
duration of 200
μ
s to allow enough time to sense the output
and keep it in regulation. As the V
OUT
load current
increases, the frequency with which the part is taken out
of shutdown must also be increased to prevent V
OUT
from drooping below 4.8V during the OFF phase (see
Figure 4b). A 100Hz 98% duty cycle signal on the SHDN
pin ensures proper regulation with load currents as high
as 100
μ
A. When load current greater than 100
μ
A is
needed, the SHDN pin must be forced low as in normal
operation. The typical no-load supply current for this
circuit with V
IN
= 3V is only
3.2
μ
A
.
1
2
3
4
8
7
6
5
C1
–
SHDN
GND
C2
–
C1
+
V
IN
V
OUT
C2
+
LTC1516
0.22
μ
F
FROM MPU
10
μ
F
10
μ
F
V
OUT
= 5V
±
4%
SHDN PIN WAVEFORMS:
LOW I
Q
MODE (5Hz TO 100Hz, 95% TO 98% DUTY CYCLE)
I
OUT
≤
100
μ
A
V
OUT
LOAD ENABLE MODE
(I
OUT
= 100
μ
A TO 50mA)
0.22
μ
F
V
IN
= 2V TO 5V
+
+
1516 F03
Figure 3. Ultralow Quiescent Current (<5
μ
A) Regulated Supply
Figure 4b. Maximum SHDN OFF Time vs Output Load Current for
Ultralow I
Q
Operation
Figure 4a. No Load I
CC
vs Input Voltage for Circuit in Figure 3
OUTPUT CURRENT (
μ
A)
1
10
100
1000
M
1000
1516 F04b
1
10
100
SHDN ON PULSE WIDTH = 200
μ
s
C
OUT
= 10
μ
F
INPUT VOLTAGE (V)
0.0
2.0
4.0
6.0
S
μ
A
5.0
1516 F04a
2.0
3.0
4.0
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