AAT3110 - Skyworks Solutions, Inc.

DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
General Description
Features
The AAT3110 ChargePump is a member of Skyworks'
Total Power Management IC™ (TPMIC™) product family.
It is a MicroPower switched capacitor voltage converter
that delivers a regulated output. No external inductor is
required for operation. Using three small capacitors, the
AAT3110 can deliver up to 100mA to the voltage regulated output. The AAT3110 features very low quiescent
current and high efficiency over a large portion of its load
range, making this device ideal for battery-powered
applications. Further­more, the combination of few external components and small package size keeps the total
converter board area to a minimum in space-restricted
applications. The AAT3110 operates in an output regulated voltage doubling mode. The regulator uses a pulse
skipping technique to provide a regulated output from a
varying input supply. The AAT3110 contains a thermal
management circuit to protect the device under continuous output short-circuit conditions.
• Step-Up Voltage Converter
• Input Voltage Range:
▪ AAT3110-5: 2.7V to 5V
▪ AAT3110-4.5: 2.7V to 4.5V
• MicroPower Consumption: 13µA
• Regulated 5V, 4.5V ±4% Output
• 5V Output Current:
▪ 100mA with VIN ≥ 3.0V
▪ 50mA with VIN ≥ 2.7V
• 4.5V Output Current:
▪ 100mA with VIN ≥ 3.0V
▪ 50mA with VIN ≥ 2.7V
• Peak Current 250mA for 100ms
• High Frequency 750kHz Operation
• Shutdown Mode Draws Less Than 1µA
• Short-Circuit/Over-Temperature Protection
• 2kV ESD Rating
• SC70JW-8 or SOT23-6 Package
The AAT3110 is available in a Pb-free, surface-mount
6-pin SOT23 or 8-pin SC70JW package and is rated over
the -40°C to +85°C temperature range.
Applications
• Cellular Phones
• Digital Cameras
• Handheld Electronics
• LED/Display Backlight Driver
• LEDs for Camera Flash
•PDAs
• Portable Communication Devices
Typical Application
AAT3110
VOUT
VOUT
C+
COUT
10µF
ON/OFF
GND
SHDN
1µF
VIN
VIN
C-
CIN
10µF
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202126A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012
1
DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Pin Descriptions
Pin Number
SOT23-6
SC70JW-8
Symbol
1
1
VOUT
2
3
4
5
6
2, 3, 4
5
6
7
8
GND
SHDN
CVIN
C+
Function
Regulated output pin. Bypass this pin to ground with a 6.8µF (min) low equivalent series resistance (ESR) capacitor.
Ground connection.
Shutdown input. Logic low signal disables the converter.
Flying capacitor negative terminal.
Input supply pin. Bypass this pin to ground with a 6.8µF (min) low-ESR capacitor.
Flying capacitor positive terminal.
Pin Configuration
SOT23-6
VOUT
GND
2
SHDN
1
2
3
6
C+
5
VIN
4
C-
SC70JW-8
VOUT
GND
GND
GND
1
8
2
7
3
6
4
5
C+
VIN
CSHDN
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DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Absolute Maximum Ratings1
TA = 25°C, unless otherwise noted.
Symbol
VIN
VOUT
VSHDN
tSC
TJ
TLEAD
VESD
Description
VIN to GND
VOUT to GND
SHDN to GND
Output to GND Short-Circuit Duration
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
ESD Rating2 — HBM
Value
Units
-0.3 to 6
-0.3 to 6
-0.3 to 6
Indefinite
-40 to 150
300
2000
V
V
V
s
°C
°C
V
Rating
Units
150
667
°C/W
mW
Thermal Information3
Symbol
QJA
PD
Description
Maximum Thermal Resistance
Maximum Power Dissipation
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Human body model is a 100pF capacitor discharged through a 1.5kW resistor into each pin.
3. Mounted on an FR4 board.
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202126A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012
3
DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Electrical Characteristics
TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C, CFLY = 1µF, CIN = 10µF, COUT = 10µF.
Symbol
Description
AAT3110-5
VIN
Input Voltage
IQ
No Load Supply Current1
VOUT
Output Voltage
ISHDN
Shutdown Supply Current
VRIPPLE
Ripple Voltage
h
Efficiency
fOSC
Frequency
VIH
SHDN Input Threshold High
VIL
SHDN Input Threshold Low
IIH
SHDN Input Current High
IIL
SHDN Input Current Low
tON
VOUT Turn-On Time
ISC
Short-Circuit Current2
AAT3110-4.5
VIN
Input Voltage
IQ
No Load Supply Current3
VOUT
Output Voltage
ISHDN
Shutdown Supply Current
VRIPPLE
Ripple Voltage
h
fOSC
VIH
VIL
IIH
IIL
tON
ISC
Efficiency
Frequency
SHDN Input Threshold High
SHDN Input Threshold Low
SHDN Input Current High
SHDN Input Current Low
VOUT Turn-On Time
Short-Circuit Current2
Conditions
Min
VOUT = 5.0V
2.7V < VIN < 5V, IOUT = 0mA, SHDN = VIN
2.7V < VIN < 5V, IOUT ≤ 50mA
3.0V < VIN < 5V, IOUT ≤ 100mA
2.7V < VIN < 3.6V, IOUT = 0mA, VSHDN = 0
3.6V < VIN < 5V, IOUT = 0mA, VSHDN = 0
VIN = 2.7V, IOUT = 50mA
VIN = 3V, IOUT = 100mA
VIN = 2.7V, IOUT = 50mA
Oscillator Free Running
Typ
Max
Units
13
5.0
5.0
0.01
VOUT
30
5.2
5.2
1
2.5
V
µA
2.7
4.8
4.8
25
30
92
750
-1
-1
VOUT = 4.5V
2.7V < VIN < 4.5V, IOUT =
2.7V < VIN < 4.5V, IOUT ≤
3.0V < VIN < 4.5V, IOUT ≤
2.7V < VIN < 3.6V, IOUT =
3.6V < VIN < 4.5V, IOUT =
VIN = 2.7V, IOUT = 50mA
VIN = 3V, IOUT = 100mA
VIN = 2.7V, IOUT = 50mA
Oscillator Free Running
2.7
0mA, SHDN = VIN
50mA
100mA
0mA, VSHDN = 0
0mA, VSHDN = 0
0.3
1
1
0.2
300
4.32
4.32
13
4.5
4.5
0.01
VOUT
30
4.68
4.68
1
2.5
25
30
83
750
0.3
1
1
-1
-1
0.2
300
1. VOUT is pulled up to 5.5V to prevent switching.
2. Under short-circuit conditions, the device may enter over-temperature protection mode.
3. VOUT is pulled up to 5.0V to prevent switching.
4
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%
kHz
V
V
µA
µA
ms
mA
V
µA
V
µA
mVP-P
1.4
SHDN = VIN
SHDN = GND
VIN = 3V, IOUT = 0mA
VIN = 3V, VOUT = GND, SHDN = 3V
µA
mVP-P
1.4
SHDN = VIN
SHDN = GND
VIN = 3V, IOUT = 0mA
VIN = 3V, VOUT = GND, SHDN = 3V
V
%
kHz
V
V
µA
µA
ms
mA
DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Typical Characteristics—AAT3110-5V
Unless otherwise noted, VIN = 3V, CIN = COUT = 10µF, CFLY = 1µF, TA = 25°C.
Output Voltage vs. Output Current
Supply Current vs. Supply Voltage
22
5.1
VIN = 3.6V
Supply Current (µA)
Output Voltage (V)
5.15
5.05
5
VIN = 3.0V
4.95
VIN = 2.7V
4.9
VIN = 3.3V
4.85
50
100
18
16
14
12
10
8
2.5
4.8
0
IOUT = 0µA
CFLY = 1µF
VSHDN = VIN
20
150
3
Output Current (mA)
Supply Current vs VSHDN
95
Efficiency (%)
Supply Current (µA)
VIN = 3.3V
15
VIN = 2.8V
10
4.5
5
5.5
25mA
90
IOUT = 0mA
VIN = 5.5V
20
4
Efficiency vs. Supply Voltage
30
25
3.5
Supply Voltage (V)
85
80
75
50mA
70
65
100mA
60
55
50
5
45
2.70
0
0
1
2
3
4
3.00
3.50
4.00
4.50
5.00
Supply Voltage (V)
5
VSHDN Control Voltage (V)
Efficiency vs. Load Current
VIN = 2.7V
Efficiency (%)
90
80
70
60
VIN = 3.0V
VIN = 3.6V
50
40
VIN = 3.3V
30
20
10
0
0.01
0.1
1
10
Load Current (mA)
100
1000
Oscillator Frequency (kHz)
100
Oscillator Frequency vs. Supply Voltage
1200
1100
1000
- 40°C
900
800
700
25°C
600
500
400
2.7
85°C
3.0
3.5
4.0
4.5
5.0
Supply Voltage (V)
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5
DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Typical Characteristics—AAT3110-5V
Unless otherwise noted, VIN = 3V, CIN = COUT = 10µF, CFLY = 1µF, TA = 25°C.
Startup Time with 100mA Load
Startup Time with 50mA Load
SHDN
(2V/div)
SHDN
(2V/div)
VOUT
(1V/div)
VOUT
(1V/div)
Time (50µs/div)
Time (50µs/div)
Load Transient Response for 50mA
Load Transient Response for 100mA
IOUT
0mA to
50mA
(20mA/div)
IOUT
0mA to
100 mA
(50mA/div)
VIN = 3.0V
VIN = 3.0V
VOUT
AC
Coupled
(20mV/div)
VOUT
AC
Coupled
(20mV/div)
Time (50µs/div)
Time (50µs/div)
Output Ripple with IOUT = 100mA
Output Ripple with IOUT = 50mA
VOUT
AC
Coupled
(10 mV/div)
VOUT
AC
Coupled
(10mV/div)
VIN = 3.0V
VIN = 3.0V
Time (2µs/div)
6
Time (2µs/div)
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202126A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012
DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Typical Characteristics—AAT3110-5V
Unless otherwise noted, VIN = 3V, CIN = COUT = 10µF, CFLY = 1µF, TA = 25°C.
Output Voltage vs. Input Voltage
(IOUT = 250mA)
Output Voltage (V)
5.2
-20°C
4.8
20°C
4.4
55°C
one shot
pulse
t = 100ms
4
3.6
3.2
3.2
3.4
3.6
3.8
Input Voltage (V)
4
4.2
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202126A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012
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DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Typical Characteristics—AAT3110-4.5V
Unless otherwise noted, VIN = 3V, CIN = COUT = 10µF, CFLY = 1µF, TA = 25°C.
Output Voltage vs. Output Current
Supply Current vs. Supply Voltage
18
3.6V
4.53
4.52
2.7V
4.51
Supply Current (µA)
Output Voltage (V)
4.54
3.0V
3.3V
4.5
4.49
0.1
1
10
100
17
16
No Load, Switching
15
14
13
12
No Load, No Switching
11
10
1000
2.5
Output Current (mA)
3
3.5
4
4.5
Supply Voltage (V)
Efficiency vs. Supply Voltage
Supply Current vs. VSHDN
85
IOUT = 0mA
25
80
Efficiency (%)
Supply Current (µA)
30
20
VIN = 5.5V
15
10
VIN = 2.8V
VIN = 3.3V
100mA
70
50mA
65
60
5mA
55
5
50
2.7
0
0
1
2
3
4
Oscillator Frequency (kHz)
75
VIN = 3.0V
VIN = 3.3V
60
0.1
1
10
3.5
3.7
3.9
4.1
100
1000
4.5
1200
1100
1000
- 40°C
900
800
700
25°C
600
500
400
2.7
85°C
3.0
3.5
4.0
4.5
Supply Voltage (V)
Load Current (mA)
8
4.3
Oscillator Frequency vs. Supply Voltage
VIN = 2.7V
65
3.3
85
70
3.1
Supply Voltage (V)
Efficiency vs. Load Current
80
2.9
5
VSHDN Control Voltage (V)
Efficiency (%)
75
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5.0
DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Typical Characteristics—AAT3110-4.5V
Unless otherwise noted, VIN = 3V, CIN = COUT = 10µF, CFLY = 1µF, TA = 25°C.
Load Transient Response
Load Transient Response
(VIN = 2.7V)
(VIN = 3.0V)
IOUT
(100mA/div)
IOUT
(100mA/div)
VOUT
(20mV/div)
VOUT
(20mV/div)
Time (50µs/div)
Time (50µs/div)
Output Ripple
Output Ripple
(IOUT = 50mA @ VIN = 2.7V)
(IOUT = 100mA @ VIN = 3.0V)
VOUT
AC Coupled
(5mV/div)
VOUT
AC Coupled
(5mV/div)
Time (5µs/div)
Time (5µs/div)
Maximum Current Pulse vs. Input Voltage
Maximum Current Pulse (mA)
Output Voltage vs. Input Voltage
for Pulsed High Current
Output Voltage (V)
4.6
4.5
4.4
4.3
One-shot pulse duration = 50ms
IOUT = 250mA
4.2
4.1
600
500
400
300
One-shot pulse duration = 50ms
VOUT > 4.0V
200
100
0
3
4
3
3.2
3.4
3.6
3.8
Input Voltage (V)
4
4.2
3.2
3.4
3.6
3.8
4
4.2
Input Voltage (V)
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9
DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Typical Characteristics—AAT3110-4.5V
Unless otherwise noted, VIN = 3V, CIN = COUT = 10µF, CFLY = 1µF, TA = 25°C.
Startup
SHDN
(1V/div)
ILOAD = 150mA @ VIN = 3.3V
ILOAD = 100mA @ VIN = 3.0V
VOUT
(2V/div)
ILOAD = 50mA @ VIN = 2.7V
Time (100ms/div)
10
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202126A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012
DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Typical Characteristics—AAT3110
SHDN Input Threshold (low)
vs. Input Voltage
SHDN Input Threshold (high)
vs. Input Voltage
1.00
0.95
-40°C
0.90
0.85
25°C
0.80
0.75
0.70
85°C
0.65
0.60
0.55
0.50
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SHDN Input Threshold (low) (V)
SHDN Input Threshold (high) (V)
Unless otherwise noted, VIN = 3V, CIN = COUT = 10µF, CFLY = 1µF, TA = 25°C.
1.00
0.95
0.90
0.80
0.70
0.65
0.55
0.50
2.0
Normalized Output Voltage (%)
VSHDN Threshold (V)
0.95
0.90
VIH
0.80
0.75
VIL
0.60
0.55
0.50
2.0
2.5
3.0
3.5
4.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Normalized Output Voltage vs. Temperature
1.00
0.65
85°C
0.60
Input Voltage (V)
VSHDN Threshold vs. Input Voltage
0.70
25°C
0.75
Input Voltage (V)
0.85
-40°C
0.85
4.5
Input Voltage (V)
5.0
5.5
1.20
IOUT = 25mA
1.00
0.80
0.60
0.40
0.20
0.00
-0.20
-0.40
-0.60
-50
-25
0
25
50
75
100
125
Temperature (°C)
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11
DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Functional Block Diagram
VIN
S2
SHDN
S1
CONTROL
C+
CVREF
S4
S3
VOUT
+
GND
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 internal
switches at two non-overlapping phases. During the first
phase, switches S1 and S4 are switched on (short) and
12
switches S2 and S3 are off (open). The flying capacitor
CFLY is charged to a level approximately equal to input
voltage VIN. 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
CFLY is connected to GND during the first phase. During
the second phase, the flying capacitor CFLY is switched so
that the low side is connected to VIN. The voltage at the
high side of the flying capacitor CFLY is bootstrapped to 2
× VIN and is connected to output through a switch. For
each cycle phase, charge from input node VIN 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
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
internal trip point level, the switching cycle stops and
the charge pump circuit is temporarily 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
current. 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
VIN, VOUT, COUT, and IOUT.
For each phase of the switching cycle, the charge transported from VIN to VOUT can be approximated by the following formula:
VPHASE » CFLY · (2 · VIN - VOUT)
The relative average current that the charge pump can
supply to the output may be approximated by the following expression:
IOUT(AVG) α CFLY · (2 · VIN - VOUT) · FSW
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.
Applications Information
External Capacitor Selection
Careful selection of the three external capacitors CIN,
COUT, and CFLY is very important because they will affect
turn-on time, output ripple, and transient performance.
Optimum performance will be obtained when low ESR
ceramic capacitors are used. In general, low ESR may be
defined as less than 100mW. If desired for a particular
application, low ESR tantalum capacitors may be substituted; however, optimum output ripple performance
may not be realized. Aluminum electrolytic capacitors
are not recommended for use with the AAT3110 due to
their inherent high ESR characteristic.
Typically as a starting point, a capacitor value of 10µF
should be used for CIN and COUT with 1mF for CFLY when the
AAT3110 is used under maximum output load conditions.
Lower values for CIN, COUT, and CFLY may be utilized for
light load current applications. Applications drawing a
load current of 10mA or less may use a CIN and COUT
capacitor value as low as 1µF and a CFLY value of 0.1µF.
CIN and COUT may range from 1µF for light loads to 10µF
or more for heavy output load conditions. CFLY may range
from 0.01µF to 2.2µF or more. If CFLY is increased, COUT
should also be increased by the same ratio to minimize
output ripple. As a basic rule, the ratio between CIN, COUT,
and CFLY should be approximately 10 to 1. The compromise for lowering the value of CIN, COUT, and the flying
capacitor CFLY is that the output ripple voltage may be
increased. In any case, if the external capacitor values
deviate greatly from the recommendation of CIN = COUT =
10µF and CFLY = 1µF, the AAT3110 output performance
should be evaluated to assure the device meets application requirements.
In applications where the input voltage source has very
low impedance, it is possible to omit the CIN capacitor.
However, if CIN is not used, circuit performance should be
evaluated to assure desired operation is achieved. Under
high peak current operating conditions that are typically
experienced during circuit start-up or when load demands
create a large inrush current, poor output voltage regulation can result if the input supply source impedance is
high or if the value of CIN is too low. This situation can
be remedied by increasing the value of CIN.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202126A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 3, 2012
13
DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Capacitor Characteristics
Charge Pump Efficiency
Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the
AAT3110. Ceramic capacitors offer many advantages
over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically has very low ESR, is
lower cost, has a smaller PCB footprint, and is nonpolarized. Low ESR ceramic capacitors help maximize
charge pump transient response. Since ceramic capacitors are non-polarized, they are not prone to incorrect
connection damage.
The AAT3110 is a regulated output voltage doubling
charge pump. The efficiency (h) can simply be defined as
a linear voltage regulator with an effective output voltage
that is equal to two times the input voltage. Efficiency (h)
for an ideal voltage doubler can typically be expressed as
the output power divided by the input power.
Equivalent Series Resistance: ESR is a very important
characteristic to consider when selecting a capacitor. ESR
is a resistance internal to a capacitor that is caused by
the leads, internal connections, size or area, material
composition, and ambient temperature. Typically, capacitor ESR is measured in milliohms for ceramic capacitors
and can range to more then several ohms for tantalum
or aluminum electrolytic capacitors.
In addition, with an ideal voltage doubling charge pump,
the output current may be expressed as half the input
current. The expression to define the ideal efficiency (h)
can be rewritten as:
Ceramic Capacitor Materials: Ceramic capacitors less
than 0.1µF are typically made from NPO or C0G materials. NPO and C0G materials typically have tight tolerance
and are very stable over temperature. Large capacitor
values are typically composed of X7R, X5R, Z5U, or Y5V
dielectric materials. Large ceramic capacitors, typically
greater than 2.2µF, are often available in low-cost Y5V
and Z5U dielectrics. If these types of capacitors are
selected for use with the charge pump, the nominal value
should be doubled to compensate for the capacitor tolerance which can vary more than ±50% over the operating
temperature range of the device. A 10µF Y5V capacitor
could be reduced to less than 5µF over temperature; this
could cause problems for circuit operation. X7R and X5R
dielectrics are much more desirable. The temperature
tolerance of X7R dielectric is better than ±15%.
Capacitor area is another contributor to ESR. Capacitors
that are physically large will have a lower ESR when
compared to an equivalent material smaller capacitor.
These larger devices can improve circuit transient
response when compared to an equal value capacitor in
a smaller package size.
14
η=
η=
POUT
PIN
POUT
VOUT ∙ IOUT
VOUT
=
=
PIN
VIN ∙ 2 ∙ IOUT 2 ∙ VIN
-or-
η(%) = 100
 VOUT 
 2VIN 
For a charge pump with an output of 5.0V and a nominal
input of 3.0V, the theoretical efficiency is 83.3%. Due to
internal switching losses and IC quiescent current consumption, the actual efficiency can be measured at
82.7%. These figures are in close agreement for output
load conditions from 1mA to 100mA. Efficiency will
decrease as load current drops below 0.05mA or when the
level of VIN approaches VOUT. Refer to the Typical Char­
acteristics section of this datasheet for measured plots of
efficiency versus input voltage and output load current for
the given charge pump output voltage options.
Short-Circuit and Thermal Protection
In the event of a short-circuit condition, the charge pump
can draw a much as 100mA to 400mA of current from VIN.
This excessive current consumption due to an output
short-circuit condition will cause a rise in the internal IC
junction temperature. The AAT3110 has a thermal protec-
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DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
tion and shutdown circuit that continuously monitors the
IC junction temperature. If the thermal protection circuit
senses the die temperature exceeding approximately
145°C, the thermal shutdown will disable the charge
pump switching cycle operation. The thermal limit system
has 10°C of system hysteresis before the charge pump
can reset. Once the over-current event is removed from
the output and the junction temperature drops below
135°C, the charge pump will become active again. The
thermal protection system will cycle on and off if an output short-circuit condition persists. This will allow the
AAT3110 to operate indefinitely under short-circuit conditions without damaging the device.
Output Ripple and Ripple Reduction
There are several factors that determine the amplitude
and frequency of the charge pump output ripple, the values of COUT and CFLY, the load current IOUT, and the level of
VIN. Ripple observed at VOUT is typically a sawtooth waveform in shape. The ripple frequency will vary depending
on the load current IOUT and the level of VIN. As VIN
increases, the ability of the charge pump to transfer
charge from the input to the output becomes greater. As
it does, the peak-to-peak output ripple voltage will also
increase.
The size and type of capacitors used for CIN, COUT, and
CFLY have an effect on output ripple. Since output ripple
is associated with the R/C charge time constant of these
two capacitors, the capacitor value and ESR will contribute to the resulting charge pump output ripple. This is
why low ESR capacitors are recommended for use in
charge pump applications. Typically, output ripple is not
greater than 30mVP-P when VIN = 3.0V, VOUT = 5.0V, COUT
= 10µF, and CFLY = 1µF.
When the AAT3110 is used in light output load applications where IOUT < 10mA, the flying capacitor CFLY value
can be reduced. The reason for this effect is when the
charge pump is under very light load conditions, the
transfer of charge across CFLY is greater during each phase
of the switching cycle. The result is higher ripple seen at
the charge pump output. This effect will be reduced by
decreasing the value of CFLY. Caution should be observed
when decreasing the flying capacitor. If the output load
current rises above the nominal level for the reduced CFLY
value, charge pump efficiency can be compromised.
There are several methods that can be employed to
reduce output ripple depending upon the requirements
of a given application. The most simple and straightforward technique is to increase the value of the COUT
capacitor. The nominal 10µF COUT capacitor can be
increased to 22µF or more. Larger values for the COUT
capacitor (22µF and greater) will by nature have lower
ESR and can improve both high and low frequency components of the charge pump output ripple response. If a
higher value tantalum capacitor is used for COUT to
reduce low frequency ripple elements, a small 1µF low
ESR ceramic capacitor should be added in parallel to the
tantalum capacitor (see Figure 1). The reason for this is
tantalum capacitors typically have higher ESR than
equivalent value ceramic capacitors and are less able to
reduce high frequency components of the output ripple.
The only disadvantage to using large values for the COUT
capacitor is the AAT3110 device turn-on time and inrush
current may be increased.
If additional ripple reduction is desired, an R/C filter can
be added to the charge pump output in addition to the
COUT capacitor (see Figure 2). An R/C filter will reduce
output ripple by primarily attenuating high frequency
components of the output ripple waveform. The low frequency break point for the R/C filter will significantly
depend on the capacitor value selected.
Layout Considerations
High charge pump switching frequencies and large peak
transient currents mandate careful printed circuit board
layout. As a general rule for charge pump boost converters, all external capacitors should be located as closely
as possible to the device package with minimum length
trace connections. Maximize the ground plane around
the AAT3110 charge pump and make sure all external
capacitors are connected to the immediate ground
plane. A local component side ground plane is recommended. If this is not possible due to layout design
limitations, assure good ground connections by the use
of large or multiple PCB vias. Refer to the AAT3110
evaluation board for an example of good charge pump
layout design (Figures 3 through 5).
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15
DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
VOUT
(5V)
COUT2
1µF
COUT1
22µF
+
VOUT
C+
AAT3110-5
GND
CFLY
1µF
+
ON/OFF
SHDN
VIN
(2.7V to 5V)
VIN
C-
CIN
10µF
Figure 1: Application Using Tantalum Capacitor.
VOUT
(5V)
RFILTER
1.5Ω
CFILTER
33µF
COUT
10µF
ON/OFF
VOUT
C+
AAT3110-5
GND
SHDN
CFLY
1µF
VIN
C-
CIN
10µF
VIN
(2.7V to 5V)
Figure 2: Application With Output Ripple Reduction Filter.
16
Figure 3: Evaluation Board Figure 4: Evaluation Board
Top Side Silk Screen Layout/
Component Side Layout.
Assembly Drawing.
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DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Figure 5: Evaluation Board Solder Side Layout.
Typical Application Circuits
VOUT
(5V)
VOUT
COUT
10µF
C+
CFLY
1µF
AAT3110-5
GND
ON/OFF
SHDN
VIN
CIN
10µF
C-
VIN
(2.7V to 5V)
Figure 6: Typical Charge Pump Boost Converter Circuit.
CFLY
1µF
C-
VIN
(USB Port VOUT)
C+
CIN
10µF
VOUT
5V
100mA
VOUT
VIN
SHDN
AAT3110-5
COUT
10µF
GND
GND
(USB Port Return)
GND
Figure 7: 5V, 100mA Supply Powered From a USB Port.
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17
DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
VIN
VOUT
C+
Li-Ion Battery
2.7V to 4.2V
10µF
SHDN
ON/OFF
10µF
AAT3110-5
120
120
120
120
1µF
C-
Figure 8: 5V LED or Display Driver from a Li-Ion Battery Source.
VIN =
3.0V to 5V
SHDN
VIN
CIN
10µF
VOUT = 5V
IOUT = 200mA
VOUT
C+
AAT3110-5
(A)
SHDN
C-
CFLY
1µF
GND
VIN
VOUT
C+
AAT3110-5
(B)
SHDN
C-
CFLY
1µF
COUT
10µF
GND
Figure 9: 5V, 200mA Step-Up Supply from a 3V to 5V Source.
18
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DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
Ordering Information
Output Voltage
Package
Marking1
Part Number (Tape and Reel)2
4.5V
5.0V
4.5V
5.0V
SOT23-6
SOT23-6
SC70JW-8
SC70JW-8
EEXYY
ASXYY
EEXYY
ASXYY
AAT3110IGU-4.5-T1
AAT3110IGU-5.0-T1
AAT3110IJS-4.5-T1
AAT3110IJS-5.0-T1
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Package Information
SOT23-6
2.85 ± 0.15
1.90 BSC
2.80 ± 0.20
0.15 ± 0.07
4° ± 4°
10° ± 5°
1.20 ± 0.25
1.10 ± 0.20
0.075 ± 0.075
1.575 ± 0.125
0.95 BSC
0.40 ± 0.10 × 6
0.60 REF
0.45 ± 0.15
GAUGE PLANE
0.10 BSC
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on all part numbers listed in BOLD.
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19
DATA SHEET
AAT3110
MicroPowerTM Regulated Charge Pump
SC70JW-8
2.20 ± 0.20
1.75 ± 0.10
0.50 BSC 0.50 BSC 0.50 BSC
0.225 ± 0.075
2.00 ± 0.20
0.100
0.15 ± 0.05
0.45 ± 0.10
4° ± 4°
0.05 ± 0.05
7° ± 3°
1.10 MAX
0.85 ± 0.15
0.048REF
2.10 ± 0.30
All dimensions in millimeters.
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