AAT2820
Triple-Output Charge Pump Regulator
2820.2006.04.1.4
1
ChargePump
TM
General Description
The AAT2820 is a member of AnalogicTech's Total
Power Management ICTM (TPMICTM) product fam-
ily. It is a triple output charge pump targeted for
active matrix thin-film transistor (TFT), liquid crys-
tal displays (LCDs), and CCD camera bias for sys-
tems operating with lithium-ion/polymer batteries.
The device generates three regulated output volt-
ages for turn-on gate drive bias (V
POS
), turn-off
gate voltage bias (V
NEG
), and logic voltage.
The V
POS
and V
NEG
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
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 V
IN
and
reduces quiescent current to less than 0.1A.
The AAT2820 is available in a Pb-free TDFN44-16
package and is specified over the -40C to +85C
operating temperature range.
Features
V
IN
Range: 2.7V to 5.5V
5V Regulated Output Voltage
Two Adjustable Regulated Output Voltages:
V
POS
and V
NEG
-- Positive Charge Pump Up to +25V
-- Negative Charge Pump Down to -25V
-- Optional Power-Up Sequence with
AAT2820-1
Internal Power MOSFETs
<1A of Shutdown Current
Internally Controlled Soft Start
Fast
Transient
Response
Ultra-Thin Solution (No Inductors)
16-Pin
TDFN44
Package
Temperature Range: -40C to +85C
Applications
CCD
Cameras
Hand-Held
Instruments
Passive-Matrix
Displays
Personal Digital Assistants (PDAs)
TFT Active-Matrix
LCDs
Typical Application
V
POS
C
IN
V
IN
C
FLY
IN
C+
C-
DRVP
FBP
GND
FBN
REF
DRVN
C
OUT
AAT2820
V
NEG
V
OUT
OUT
EN
EN/PN
Enable (Positive and
Negative Output)
Enable
Pin Description
Pin Configuration
TDFN44-16
(Top View)
GND
GND
OUT
DRVP
DRVN
3
IN
EN
GND
EN/PN
FBP
GND
FBN
REF
C+
C-
GND
4
5
1
2
6
7
8
14
13
12
16
15
11
10
9
Pin #
Symbol
Function
1
DVRP
Positive charge pump driver output. Output high level is V
SUPP
and low level is PGND.
2
DRVN
Negative charge pump driver output. Output high level is V
SUPN
and low level is PGND.
3, 4, 8, 9, 12
GND
Ground connection.
5
OUT
Regulated 5V output. Requires a 4.7F bypass capacitor to ground.
6
IN
Input power supply. A 1A capacitor should be connected between this pin and ground.
7
EN
Enable input control pin. When low, the device is powered down and consumes less than
0.1A. This pin should not be left floating.
10
C-
Flying capacitor negative terminal.
11
C+
Flying capacitor positive terminal. Connect a 1F capacitor between C+ and C-.
13
FBP
Positive charge pump feedback input. Regulates to 1.2V nominal. Connect feedback
resistive divider to analog ground (GND).
14
EN/PN
Enable input. When EN/PN is pulled low, V
POS
and V
NEG
are turned off.
15
REF
Internal reference bypass terminal. Connect a 0.1F capacitor from this terminal to ana-
log ground (GND). External load capability to 50uA. REF is disabled in shutdown.
16
FBN
Negative charge pump regulator feedback input. Regulates to 0V nominal. Connect feed-
back resistive divider to the reference (REF).
EP
Exposed paddle (bottom); connect to GND directly beneath package.
AAT2820
Triple-Output Charge Pump Regulator
2
2820.2006.04.1.4
Absolute Maximum Ratings
1
Thermal Information
2
Symbol
Description
Value
Units
JA
Maximum Thermal Resistance
50
C/W
P
D
Power Dissipation
3
2.0
W
Symbol
Description
Value
Units
V
IN
Input Voltage
-0.3 to 6.0
V
V
OUT
Charge Pump Output
-0.3 to 6.0
V
V
EN
EN or EN/PN to GND
-0.3 to 6.0
V
V
N_CH
DRVN to GND
-0.3V to (V
IN
+ 0.3V)
V
V
P_CH
DRVP to GND
-0.3V to (V
IN
+ 0.3V)
V
Other Inputs
REF, FBN, FBP to GND
-0.3V to (V
IN
+ 0.3V)
V
I
MAX
Continuous Current into DRVN, DRVP, OUT
200
mA
All Other Pins
10
T
LEAD
Maximum Soldering Temperature (at leads, 10 sec)
300
C
AAT2820
Triple-Output Charge Pump Regulator
2820.2006.04.1.4
3
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-
tions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on an FR4 board.
3. Derate 6.25mW/C above 25C.
Electrical Characteristics
1
V
IN
= 3.3V; C
IN
= C
OUT
= C
FLY
= 1.0F, T
A
= 0C to +85C, unless otherwise noted.
Typical values are T
A
= 25C.
Symbol Description
Conditions
Min Typ Max Units
V
IN
Input Supply Range
2.7
5.5
V
UVLO
Input Under-Voltage Lockout
V
IN
Rising 1.8
Threshold
V
IN
Falling
1.6 V
V
FBP
= 1.5V, V
FBN
= -0.2V, No Load on
I
CC
Operating Current
DRVN and DRVP; EN = EN/PN = V
IN
5.0 mA
I
SD
Shutdown Supply Current
V
EN
= V
EN/PN
= 0V
0.1
1.0
A
T
SS
Soft-Start Time
200 s
F
OSC
Operating Frequency
1.0
MHz
Negative Low-Power Charge Pump
V
FBN
FBN Regulation Voltage
-100
0
+100 mV
I
FBN
FBN Input Bias Current
V
FBN
= -50mV
-100
+100
nA
I
NEG
Maximum Negative Output Current
2
3.3
V
IN
5.5; No Load at V
POS
and V
OUT
25
mA
R
DS_NCH
DRVN NCH On-Resistance
1.5
5.0
R
DS_PCH
MIN DRVN PCH On-Resistance
V
FBN
= 100mV, V
IN
= 4V
1.0
5.0
MAX DRVN PCH On-Resistance
V
FBN
= -100mV, V
IN
= 4V
20
k
Positive Low-Power Charge Pump
V
FBP
FBP Regulation Voltage
1.15 1.2 1.25
V
I
FBP
FBP Input Bias Current
V
FBP
= 1.5V
-60
+100
nA
I
POS
Maximum Positive Output Current
2
3.3
V
IN
5.5; No Load at V
NEG
and V
OUT
25
mA
R
DS_PCH
DRVP PCH On-Resistance
1.0
5.0
R
DS_NCH
MIN DRVP NCH On-Resistance
V
FBP
= 1.15V, V
IN
= 4V
3
15
MAX DRVP NCH On-Resistance
V
FBP
= 1.25V, V
IN
= 4V
20
k
Reference
Reference Voltage
-2.0A < I
REF
< 50A
1.18 1.2 1.22
V
REF
Reference Under-Voltage Lockout
V
REF
Rising 0.8
V
Threshold
V
EN(L)
EN and EN/PN Threshold Low
0.5
V
V
EN(H)
EN and EN/PN Threshold High
1.5
V
I
I
Enable Input Current
-1.0
1.0
A
T
SD
Over-Temperature Shutdown
140
C
Threshold
T
HYS
Over-Temperature Shutdown
15
C
Hysteresis
Regulated 5V Charge Pump
V
OUT
Output Voltage Tolerance
2.7V < V
IN
< 5V, I
OUT
= 50mA
4.0 %
Output Voltage
3.0V < V
IN
< 5V, I
OUT
= 100mA
4.8 5.0 5.2 V
I
OUT
Maximum Output Current
2
3.3
V
IN
5.5; No Load at V
POS
and V
NEG
150
mA
AAT2820
Triple-Output Charge Pump Regulator
4
2820.2006.04.1.4
1. The AAT2820 is guaranteed to meet performance specifications from 0C to 70C. Specification over the -40C to +85C operating
temperature range is assured by design, characterization, and correlation with statistical process controls.
2. Loads greater than those listed in maximum output load conditions may cause permanent damage to the device.
Typical Characteristics
V
IN
= 3.3V, V
OUT
= 5V, V
POS
= 12.5V, V
NEG
= -7.8V, C
IN
= C
FLY
= 1F, C
OUT
= 4.7F; T
A
= 25C, unless otherwise noted.
Operating Current vs. Temperature
Temperature (
C)
Operating Current (mA)
-40
-20
0
20
40
60
80
100
4.9
5.0
5.1
5.2
5.3
5.4
5.5
5.6
5.7
Switching Frequency vs. Temperature
Temperature (
C)
Switching Frequency (kHz)
840
850
860
870
880
890
900
910
920
930
-40
-20
0
20
40
60
80
100
5V Output Efficiency vs. Output Current
(V
OUT
= 5V; V
POS
= 12.5V @ 10mA; V
NEG
= -7.8V @ 5mA)
Output Current (mA)
Efficiency (%)
0
10
20
30
40
50
60
70
0
20
40
60
80
100
120
140
160
V
IN
= 2.7V
V
IN
= 3.3V
V
IN
= 4.2V
5V Output Voltage vs. Temperature
(No-Load at V
POS
and V
NEG
)
Temperature (
C)
5V Output Voltage (V)
4.90
4.92
4.94
4.96
4.98
5.00
5.02
-40
-20
0
20
40
60
80
100
V
IN
= 2.7V
V
IN
= 3.3V
V
IN
= 4.2V
5V Output Efficiency vs. Output Current
(No-Load at V
POS
and V
NEG
)
Output Current (mA)
Efficiency (%)
0
10
20
30
40
50
60
70
80
90
100
0.1
1.0
10
100
1000
V
IN
= 4.2V
V
IN
= 3.3V
V
IN
= 2.7V
V
IN
= 3.0V
5V Output vs. Output Current
Output Current (mA)
Output Voltage (V)
4.2
4.4
4.6
4.8
5.0
5.2
0
50
100
150
200
250
300
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 3.3V
V
IN
= 3.0V
AAT2820
Triple-Output Charge Pump Regulator
2820.2006.04.1.4
5
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