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Número de pieza | AAT2820 | |
Descripción | Triple-Output Charge Pump Regulator | |
Fabricantes | AAT | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de AAT2820 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
No Preview Available ! AAT2820
Triple-Output Charge Pump Regulator
General Description
Features
ChargePump™
The AAT2820 is a member of AnalogicTech's Total
Power Management IC™ (TPMIC™) product fam-
• VIN Range: 2.7V to 5.5V
• 5V Regulated Output Voltage
ily. It is a triple output charge pump targeted for
• Two Adjustable Regulated Output Voltages:
active matrix thin-film transistor (TFT), liquid crys-
tal displays (LCDs), and CCD camera bias for sys-
VPOS and VNEG
— Positive Charge Pump Up to +25V
tems operating with lithium-ion/polymer batteries.
— Negative Charge Pump Down to -25V
The device generates three regulated output volt-
— Optional Power-Up Sequence with
ages for turn-on gate drive bias (VPOS), turn-off
gate voltage bias (VNEG), and logic voltage.
The VPOS and VNEG output voltages are independ-
ently regulated. Both outputs use external diode
and capacitor multiplier stages (as many stages as
required) to regulate output voltages up to +25V
and -25V. An additional regulated output voltage is
provided for biasing the display module. Built-in
AAT2820-1
• Internal Power MOSFETs
• <1µA of Shutdown Current
• Internally Controlled Soft Start
• Fast Transient Response
• Ultra-Thin Solution (No Inductors)
• 16-Pin TDFN44 Package
• Temperature Range: -40°C to +85°C
soft-start circuitry prevents excessive inrush current
during start-up. A high switching frequency enables
the use of very small external capacitors. A low
shutdown feature disconnects the load from VIN and
reduces quiescent current to less than 0.1µA.
Applications
• CCD Cameras
The
AAT2820
is
available
in
a
Pb-free
TDFN44-16
www.DataSheet4U.com
•
Hand-Held Instruments
package and is specified over the -40°C to +85°C
• Passive-Matrix Displays
operating temperature range.
• Personal Digital Assistants (PDAs)
• TFT Active-Matrix LCDs
Typical Application
CFLY
C+ C-
VIN IN EN
CIN
EN/PN
DRVN
OUT
AAT2820
COUT
Enable
Enable (Positive and
Negative Output)
VOUT
VNEG
FBN
REF
DRVP
GND FBP
VPOS
2820.2006.04.1.4
1
1 page AAT2820
Triple-Output Charge Pump Regulator
Typical Characteristics
VIN = 3.3V, VOUT = 5V, VPOS = 12.5V, VNEG = -7.8V, CIN = CFLY = 1µF, COUT = 4.7µF; TA = 25°C, unless otherwise noted.
5V Output vs. Output Current
5.2
VIN = 4.2V
5.0
4.8
4.6
VIN = 2.7V
4.4
4.2
0
50
VIN = 3.3V
VIN = 3.0V
100 150 200 250
Output Current (mA)
300
5V Output Efficiency vs. Output Current
(No-Load at VPOS and VNEG)
100
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 3.0V
VIN = 2.7V
VIN = 3.3V
VIN = 4.2V
1.0 10
100
1000
Output Current (mA)
5V Output Voltage vs. Temperature
(No-Load at VPOS and VNEG)
5.02
5.00 VIN = 4.2V
4.98
4.96
4.94 VIN = 2.7V VIN = 3.3V
4.92
4.90
-40
-20
0 20 40 60
Temperature (°C)
80 100
5V Output Efficiency vs. Output Current
(VOUT = 5V; VPOS = 12.5V @ 10mA; VNEG = -7.8V @ 5mA)
70
60
50 VIN = 2.7V
40
30
20
VIN = 3.3V
VIN = 4.2V
10
0
0 20 40 60 80 100 120 140 160
Output Current (mA)
Switching Frequency vs. Temperature
930
920
910
900
890
880
870
860
850
840
-40
-20
0
20 40
60
Temperature (°C)
80 100
2820.2006.04.1.4
Operating Current vs. Temperature
5.7
5.6
5.5
5.4
5.3
5.2
5.1
5.0
4.9
-40
-20
0
20 40
60
Temperature (°C)
80 100
5
5 Page AAT2820
Triple-Output Charge Pump Regulator
Design Procedure and
Component Selection
Number of Stages for Dual Charge
Pump Regulators
The number of stages required can be determined by:
NPOS =
VPOS - 5
5 - 2VFWD
for the positive output, and
NNEG =
VNEG
2VFWD - 5
for the negative output.
Where,
VNEG = Negative output voltage
VPOS = Positive output voltage
VFWD = Forward voltage drop of the Schottky diode
(0.31V, based on BAT54SDW diode when
IF = 4mA)
After solving for the number of stages (NPOS and
NNEG), round up the solutions to the next highest
integers for the number of stages required.
Tables 1 and 2 show the number of stages required
for positive and negative charge pumps, respectively.
2820.2006.04.1.4
VPOS (V)
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
# of Stages (n)
1
1
1
2
2
2
2
3
3
3
3
3
4
4
4
4
5
5
5
Table 1: Number of Stages Required for
Positive Charge Pump.
VNEG (V)
-7
-8
-9
-10
-11
-12
-13
-14
-15
-16
-17
-18
-19
-20
-21
-22
-23
-24
-25
# of Stages (n)
2
2
3
3
3
3
3
4
4
4
4
5
5
5
5
6
6
6
6
Table 2: Number of Stages Required for
Negative Charge Pump.
11
11 Page |
Páginas | Total 18 Páginas | |
PDF Descargar | [ Datasheet AAT2820.PDF ] |
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