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參數(shù)資料
| 型號： | AAT3110IJS-4.5-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | MicroPower⑩ Regulated Charge Pump |
| 中文描述： | 微功耗穩(wěn)壓電荷泵⑩ |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 290K |
| 代理商： | AAT3110IJS-4.5-T1 |
AAT3110
MicroPower Regulated Charge Pump
12
3110.2005.11.1.4
Functional Description
Operation
(Refer to block diagram)
The AAT3110 uses a switched capacitor charge
pump to boost an input voltage to a regulated output
voltage. Regulation is achieved by sensing the
charge pump output voltage through an internal
resistor divider network. A switched doubling circuit
is enabled when the divided output drops below a
preset trip point controlled by an internal comparator.
The charge pump switch cycling enables four inter-
nal switches at two non-overlapping phases. During
the first phase, switches S1 and S4 are switched on
(short) and switches S2 and S3 are off (open). The
flying capacitor C
FLY
is charged to a level approxi-
mately equal to input voltage V
IN
. During the second
phase, switches S1 and S4 are turned off (open) and
switches S2 and S3 are turned on (short). The low
side of the flying capacitor C
FLY
is connected to GND
during the first phase. During the second phase, the
flying capacitor C
FLY
is switched so that the low side
is connected to V
IN
. The voltage at the high side of
the flying capacitor C
FLY
is bootstrapped to 2
×
V
IN
and is connected to output through a switch. For
each cycle phase, charge from input node V
IN
is
transported from a lower voltage to a higher voltage.
This cycle repeats itself until the output node voltage
is high enough to exceed the preset input threshold
of the control comparator. When the output voltage
exceeds the internal trip point level, the switching
cycle stops and the charge pump circuit is tem-
porarily placed in an idle state. When idle, the
AAT3110 has a quiescent current of 13μA or less.
The closed loop feedback system containing the
voltage sense circuit and control comparator allows
the AAT3110 to provide a regulated output voltage to
the limits of the input voltage and output load cur-
rent. The switching signal, which drives the charge
pump, is created by an integrated oscillator within
the control circuit block. The free-running charge
pump switching frequency is approximately 750kHz.
The switching frequency under an active load is a
function of V
IN
, V
OUT
, C
OUT,
and I
OUT
.
For each phase of the switching cycle, the charge
transported from V
IN
to V
OUT
can be approximated
by the following formula:
V
PHASE
≈
C
FLY
×
(2
×
V
IN
- V
OUT
)
The relative average current that the charge pump
can supply to the output may be approximated by
the following expression:
I
OUT(AVG)
α
C
FLY
×
(2
×
V
IN
- V
OUT
)
×
F
SW
The AAT3110 has complete output short-circuit and
thermal protection to safeguard the device under
extreme operating conditions. An internal thermal
protection circuit senses die temperature and will shut
down the device if the internal junction temperature
exceeds approximately 145°C. The charge pump will
remain disabled until the fault condition is relieved.
Functional Block Diagram
+
-
V
REF
CONTROL
SHDN
VIN
C-
C+
VOUT
GND
S1
S3
S2
S4
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AAT3110IJS-5.0-T1 | 制造商:Advanced Analogic Tech 功能描述:AAT3110 Series 750kHz 100mA Step up MicroPower Regulated Charge Pump-SC-70JW-8 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3110IJS-5-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:MicroPower⑩ Regulated Charge Pump |
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| AAT3111-36 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:MicroPower⑩ Regulated Charge Pump |
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