ANALOGICTECH AAT3119IJS-5.0-T1

AAT3119
High Efficiency 2X Charge Pump
General Description
Features
The AAT3119 is a general purpose high efficiency
voltage regulated charge pump IC that can produce
output current levels up to 150mA. As a voltage
regulated output device, it may be used for general
voltage boost applications or to power white, RGB,
or flash type LEDs from a 2.7V to 5.5V input.
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The voltage doubling charge pump architecture of
the AAT3119 provides for a low external part count;
just three small ceramic capacitors are needed.
This makes the AAT3119 ideally suited for small
battery-powered applications. This device operates from a fixed high frequency 1.2MHz oscillator
which enables the use of very small external
capacitors, one 1μF flying capacitor, and two 1μF
bypass capacitors at IN and OUT.
ChargePump™
VIN Range: 2.7V to 5.5V
150mA of Output Current
— Peak Current up to 250mA
Regulated Output Voltage
1.2MHz Switching Frequency
Low Noise Constant Frequency Operation
<1.0μA of Shutdown Current
Automatic Soft Start
Small Application Circuit
Inductorless Boost
8-Pin SC70JW Package
-40°C to +85°C Temperature Range
Applications
The AAT3119 has built-in soft-start circuitry which
prevents excessive inrush current from the source
supply during startup. A low-current shutdown feature disconnects the load from VIN and reduces
quiescent current to less than 1.0μA when the
device is disabled. The AAT3119 is available in a
Pb-free, 8-pin SC70JW package and is rated over
the -40°C to +85°C temperature range.
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Cellular Phones
Digital Cameras
Handheld Electronics
PDAs
White LED Backlighting
White LED Camera Flash
Typical Application
CFLY
1μF
C+
C-
IN
VIN
VOUT
OUT
COUT
1μF
CIN
1μF
AAT3119
Enable
EN
GND
3119.2007.02.1.2
1
AAT3119
High Efficiency 2X Charge Pump
Pin Descriptions
Pin #
Symbol
Function
1
EN
Enable input control pin. When low, the device is disabled and consumes
less than 1μA of current. This pin should not be left floating.
2
IN
Input power supply. A 1μF capacitor should be connected between this
pin and ground.
3
OUT
4
C+
Flying capacitor positive terminal. Connect a 1μF capacitor between C+
and C-.
5
C-
Flying capacitor negative terminal.
6
GND
Ground connection.
7
GND
Ground connection.
8
GND
Ground connection.
Charge pump output. Connect a 1μF capacitor between this pin and
ground.
Pin Configuration
SC70JW-8
EN
IN
OUT
C+
2
1
8
2
7
3
6
4
5
GND
GND
GND
C-
3119.2007.02.1.2
AAT3119
High Efficiency 2X Charge Pump
Absolute Maximum Ratings1
Symbol
VIN
VOUT
VEN
VEN(MAX)
IOUT
TJ
TLEAD
Description
Input Voltage
Charge Pump Output
EN to GND Voltage
Maximum EN to Input Voltage
Maximum DC Output Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
Units
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
0.3
250
-40 to 150
300
V
V
V
V
mA
°C
°C
Value
Units
160
625
°C/W
mW
Thermal Information2
Symbol
ΘJA
PD
Description
Thermal Resistance
Maximum Power Dissipation3
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. Mounted on an FR4 board.
3. Derate 6.25mW/°C above 25°C.
3119.2007.02.1.2
3
AAT3119
High Efficiency 2X Charge Pump
Electrical Characteristics1
VIN = 3.3V; CIN = COUT = CFLY = 1.0μF; TA = -40°C to 85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol
AAT3119-5.0
Power Supply
VIN
VOUT
ICC
ISHDN
IOUT
η
Description
Input Voltage Range
Output Voltage Tolerance
Output Voltage
Operating Current
Shutdown Current
Maximum Output Current
Efficiency
Conditions
Min Typ Max Units
2.7
2.7V < VIN < 5V, IOUT = 50mA
3.0V < VIN < 5V, IOUT = 100mA
VIN = 5.0V, Active, No Load Current
EN = 0
3.0 ≤ VIN ≤ 5.5
VIN = 3.0V, IOUT = 100mA
4.8
5.5
±4
5.0
2.0
5.2
4.5
1.0
150
82
V
%
V
mA
μA
mA
%
EN
VEN(L)
VEN(H)
Ii
Charge Pump
TSS
FCLK
AAT3119-4.5
Power Supply
VIN
VOUT
ICC
ISHDN
IOUT
η
Enable Threshold Low
Enable Threshold High
Enable Input Current
0.4
EN = 5.5V
1.4
-1.0
Soft-Start Time
Clock Frequency
200
1200
Input Voltage Range
Output Voltage
Operating Current
Shutdown Current
Maximum Output Current
Efficiency
1.0
2.7
2.7V < VIN < 5V, IOUT = 50mA
3.0V < VIN < 5V, IOUT = 100mA
VIN = 4.5V, Active, No Load Current
EN = 0
3.0 ≤ VIN ≤ 5.5
VIN = 2.7V, IOUT = 100mA
4.32
μs
kHz
5.5
±4
4.5
2.0
V
V
μA
4.68
4.5
1.0
150
82
V
%
V
mA
μA
mA
%
EN
VEN(L)
VEN(H)
Ii
Charge Pump
TSS
FCLK
Enable Threshold Low
Enable Threshold High
Enable Input Current
Soft-Start Time
Clock Frequency
0.4
EN = 5.5V
1.4
-1.0
1.0
200
1200
V
V
μA
μs
kHz
1. The AAT3119 is guaranteed to meet performance specifications from 0°C to 70°C. Specification over the -40°C to +85°C operating
temperature range is assured by design, characterization, and correlation with statistical process controls.
4
3119.2007.02.1.2
AAT3119
High Efficiency 2X Charge Pump
Typical Characteristics _ AAT3119-5V
Output Voltage vs. Output Current
Supply Current vs. Supply Voltage
5.4
Output Voltage (V)
Supply Current (mA)
3.00
5.2
VIN = 3.6
5.0
4.8
4.6
VIN = 3.3
VIN = 3.0
VIN = 2.7
4.4
4.2
4.0
0
40
80
120
160
200
IOUT = 0μA
CFLY = 1μF
VEN = VIN
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
2.5
3.0
3.5
Output Current (mA)
3
VIN = 2.8V
VIN = 3.3V
80
70
50
2
150mA
40
30
20
0
1
100mA
60
10
VIN = 5.5V
0
50mA
90
4
0
3
4
5
6
2.7
3.0
3.3
VIN = 3.0V
VIN = 2.7V
Efficiency (%)
70
60
VIN = 3.6V
VIN = 3.3V
40
30
20
10
0
0.1
1.0
10
Load Current (mA)
3119.2007.02.1.2
100
1000
Oscillator Frequency (MHz)
100
50
3.9
4.2
4.5
Oscillator Frequency vs. Supply Voltage
Efficiency vs. Load Current
80
3.6
Supply Voltage (V)
VEN Control Voltage (V)
90
5.0
100
IOUT = 0μA
Efficiency (%)
Supply Current (mA)
5
1
4.5
Efficiency vs. Supply Voltage
Supply Current vs. VEN
2
4.0
Supply Voltage (V)
1.30
1.25
+25°C
1.20
+85°C
-40°C
1.15
1.10
2.7
3.2
3.7
4.2
4.7
Supply Voltage (V)
5
AAT3119
High Efficiency 2X Charge Pump
Typical Characteristics _ AAT3119-5V
Start-Up Time with 50mA Load
Start-Up Time with 100mA Load
ENABLE
(1V/div)
ENABLE
(1V/div)
VOUT
(1V/div)
VOUT
(1V/div)
Time (100μs/div)
Time (100μs/div)
Load Response
Load Response
(50mA Load)
(100mA Load)
VIN = 3.5V
VIN = 3.5V
VOUT
(10mV/div)
VOUT
(10mV/div)
IOUT
(20mA/div)
IOUT
(50mA/div)
Time (5ms/div)
Time (5ms/div)
Output Ripple Voltage
Output Ripple Voltage
(IOUT = 50mA @ VIN = 3.5V)
(IOUT = 100mA @ VIN = 3.5V)
VIN
(10mV/div)
VIN
(10mV/div)
VOUT
(10mV/div)
VOUT
(20mV/div)
IIN
(10mA/div)
IIN
(10mA/div)
Time (1μs/div)
6
Time (1μs/div)
3119.2007.02.1.2
AAT3119
High Efficiency 2X Charge Pump
Typical Characteristics _ AAT3119-4.5V
Output Voltage vs. Output Current
Supply Current vs. Supply Voltage
3.00
4.8
VIN=3.3
4.6
VIN=3.6
4.4
4.2
4.0
3.8
VIN = 3.0
VIN = 2.7
3.6
IOUT = 0μA
2.75 CFLY = 1μF
VEN = VIN
2.50
Supply Current (mA)
Output Voltage (V)
5.0
3.4
3.2
2.25
2.00
1.75
1.50
1.25
3.0
0
40
80
120
160
1.00
2.5
200
3.0
Output Current (mA)
Supply Current vs. VEN
5.0
50mA
90
80
3
VIN = 2.8V
2
VIN = 3.3V
1
VIN = 5.5
0
1
70
60
100mA
50
150mA
40
30
20
10
2
3
4
5
0
6
2.7
3.0
VEN Control Voltage (V)
VIN = 2.7V
70
60
50
VIN = 3.6V
40
VIN = 3.3V
30
20
10
0
0.1
1.0
10
Load Current (mA)
3119.2007.02.1.2
100
1000
Oscillator Frequency (MHz)
VIN = 3.0V
80
3.6
3.9
4.2
4.5
Oscillator Frequency vs. Supply Voltage
100
90
3.3
Supply Voltage (V)
Efficiency vs. Load Current
Efficiency (%)
4.5
100
IOUT = 0μA
4
0
4.0
Efficiency vs. Supply Voltage
Efficiency (%)
Supply Current (mA)
5
3.5
Supply Voltage (V)
1.30
+85°C
1.25
+25°C
-40°C
1.20
1.15
1.10
2.7
3.0
3.3
3.6
3.9
4.2
4.5
Supply Voltage (V)
7
AAT3119
High Efficiency 2X Charge Pump
Typical Characteristics _ AAT3119-4.5V
Load Response
Load Response
(50mA Load)
(100mA Load)
VIN = 3.5V
VIN = 3.5V
VOUT
(10mV/div)
VOUT
(10mV/div)
IOUT
(50mA/div)
IOUT
(20mA/div)
Time (5ms/div)
Time (5ms/div)
Output Ripple Voltage
Output Ripple Voltage
(IOUT = 50mA @ VIN = 3.5V)
(IOUT = 100mA @ VIN = 3.5V)
VIN
(10mV/div)
VIN
(10mV/div)
VOUT
(10mV/div)
VOUT
(20mV/div)
IIN
(10mA/div)
IIN
(10mA/div)
Time (1μs/div)
Time (1μs/div)
Startup
Maximum Current Pulse (mA)
Maximum Current Pulse vs. Supply Voltage
600
500
ENABLE
(1V/div)
400
300
ILOAD = 100mA @ VIN = 3.0V
One-shot pulse duration = 250ms
VOUT> 4.0V
200
VOUT
(1V/div)
100
ILOAD = 150mA @ VIN = 3.3V
0
3.0
3.2
3.4
3.6
3.8
Supply Voltage (V)
8
ILOAD = 150mA @ VIN = 3.3V
4.0
4.2
Time (100μs/div)
3119.2007.02.1.2
AAT3119
High Efficiency 2X Charge Pump
Typical Characteristics _ AAT3119
VIN vs. VIH
1.00
1.00
0.95
0.95
0.90
0.90
-40°C
0.80
0.85
VIL (V)
0.85
VIH (V)
VIN vs. VIL
+25°C
0.75
0.70
0.65
0.70
+85°C
0.60
0.55
0.50
+25°C
0.75
0.65
+85°C
0.60
-40°C
0.80
0.55
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
0.50
2.7
3.1
Supply Voltage (V)
VIH
0.80
VIL
0.70
0.65
0.60
0.55
0.50
2.7
3.1
3.5
3.9
4.3
4.7
Supply Voltage (V)
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5.1
5.5
Normalized Output Voltage (%)
VEN Threshold (V)
0.95
0.75
4.3
4.7
5.1
5.5
Normalized Output Voltage vs. Temperature
1.00
0.85
3.9
Supply Voltage (V)
VEN Threshold vs. Supply Voltage
0.90
3.5
2.0
IOUT = 25mA
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-50
-30
-10
10
30
50
70
90
Temperature (°C)
9
AAT3119
High Efficiency 2X Charge Pump
Functional Block Diagram
C1+
IN
C1-
Charge
Pump
OUT
Soft Start
1MHz
Oscillator
Voltage
Reference
EN
GND
Functional Description
The AAT3119 is a 5.0V or 4.5V regulated voltage
doubling charge pump device intended for general
applications that require low noise voltage boost
function from input supplies ranging from 2.7V to
5.5V. The charge pump is capable maintaining the
regulated voltage output for continuous output current loads up to 150mA. This makes the AAT3119
ideal for general purpose voltage boost applications, driving white and RGB color LEDs, as well as
USB OTG VBUS supplies in portable products. The
AAT3119 charge pump and regulation circuit is
also capable of supplying peak pulse currents up to
250mA for 500ms. This makes the device suitable
for many photo-flash LED applications.
The AAT3119 accomplishes the voltage boost function by utilizing a voltage doubling (2X) charge
pump. The charge pump block within the device
uses low RDS MOSFET switches to transfer charge
from the input to output via a flying capacitor (CFLY).
This switching process is performed over two phases of each clock cycle which is set by the fixed
1.2MHz internal oscillator. On the first phase of
each clock cycle, the flying capacitor is placed in
parallel with the input (IN) and is charged to the
level of the input voltage across CIN. On the second
10
phase of the switching cycle, the flying capacitor is
reconfigured by the internal switches and placed in
series with the input capacitor. CIN and CFLY are
then placed across the output capacitor (COUT).
The voltage seen on COUT is then two times that of
CIN. The AAT3119 contains an internal reference
and feedback system that senses the charge pump
output and controls the charge pump function to
maintain an accurate regulated output voltage.
Because of the fixed 1.2MHz high frequency internal oscillator, the input, output, and flying capacitors are very small. This circuit architecture
requires only one 1μF ceramic capacitor for the
charge pump flying capacitor (CFLY) and one 1μF
ceramic capacitor for both CIN and COUT.
The AAT3119 has a soft-start circuit to prohibit inrush current when the device is enabled. This feature guarantees a smooth transition to the desired
output voltage when the device is turned on. The
system soft-start circuit is particularly useful in
white LED backlight applications where the use of
a PWM signal is employed as an LED dimming
function. In limiting the input inrush current each
time the device is turned on, the soft-start circuit
helps minimize back-injected switching noise and
transient supply current.
3119.2007.02.1.2
AAT3119
High Efficiency 2X Charge Pump
In the operating state, the AAT3119 typically consumes 2mA of quiescent operating current. The
enable pin (EN) is an active high input. When
pulled low, the AAT3119 is shut down, the quiescent current drops to less than 1μA, and the output
is disconnected from the input.
Charge Pump Efficiency
The core of the AAT3119 is a regulated output voltage doubling charge pump. The efficiency (η) for
an ideal voltage doubling charge pump can typically be expressed as the output power divided by the
input power:
η=
POUT
PIN
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 (η) can be rewritten as:
η=
V
POUT VOUT × IOUT
=
= OUT
PIN
VIN × 2IOUT
2VIN
Capacitor Selection
Careful selection of the three external capacitors
(CIN, CFLY, and COUT) is important because they will
affect turn-on time, output ripple, efficiency, and
load transient response. Optimum performance will
be obtained when low equivalent series resistance
(ESR) ceramic capacitors are used. In general, low
ESR may be defined as less than 100mΩ. A value
of 1μF for all three capacitors is a good starting
point when designing with the AAT3119. This not
only provides for a very small printed circuit board
area, but cost is further reduced by the minimized
bill of materials.
Input Capacitor
A 1μF multilayer ceramic chip capacitor is suggested for the input. This capacitor should be connected between the IN pin and ground. 1μF should be
suitable for most applications. Even though the
AAT3119 switching ripple and noise are very low,
back-injected line noise may be further reduced by
increasing the value of CIN. Other types of capacitors may be used for CIN at the cost of compromised circuit performance.
Output Capacitor
-or-
η(%) = 100
⎛ VOUT ⎞
⎝ 2VIN ⎠
For a charge pump with an output of 5.0 volts and
a nominal input of 3.0 volts, the theoretical efficiency is 83.3%. Due to internal switching losses and
IC quiescent current consumption, the actual efficiency can be measured at approximately 82%.
Efficiency will decrease as the level of VIN
approaches that of the regulated VOUT. Refer to
the device typical characteristics curves for expected actual efficiency based on either input voltage or
load current.
3119.2007.02.1.2
The output capacitor (COUT) should be connected
between the OUT pin and ground. A 1μF ceramic
capacitor is also suggested in this position.
Switching noise and ripple seen on the charge
pump output increases with load current. Typically
1μF is sufficient for minimizing output ripple seen
by the load circuit. If the load current in an application is low, or if higher levels of switching ripple
can be tolerated, COUT can be reduced as low as
0.33μF. If application circuits with greater load current demands require lower switching ripple amplitudes, COUT may be increased to values above
1μF. Capacitor types other than ceramic capacitors can be used for COUT. However, capacitors
comprised of materials other than ceramic will typically have a greater value of ESR, resulting in
increased output switching ripple.
11
AAT3119
High Efficiency 2X Charge Pump
Flying Capacitor
Due to the switching operation of the voltage doubling circuit topology, current flow through the flying
capacitor is bi-directional. The flying capacitor
selected must be a non-polarized type. A 1μF low
ESR ceramic capacitor is ideal for this application.
Capacitor Characteristics
Ceramic composition capacitors are highly recommended over all other types of capacitors for use with
the AAT3119. Ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic
counterparts. A ceramic capacitor typically has very
low ESR, is lowest cost, has a smaller PCB footprint,
and is non-polarized. Low ESR ceramic capacitors
help maximize charge pump transient response.
Since ceramic capacitors are non-polarized, they are
not prone to incorrect connection damage.
Equivalent Series Resistance: ESR is an important characteristic to consider when selecting a
capacitor. ESR is a resistance internal to a capacitor that is determined by the leads, internal connections, size or area, material composition, and
ambient temperature. Capacitor ESR is typically
measured in milliohms for ceramic capacitors and
can range to more than several ohms for tantalum
or aluminum electrolytic capacitors.
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 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, but large capacitors are not
required in most AAT3119 applications. 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.
12
Applications Information
White LED Backlight Driver
LED Selection: In applications where the AAT3119
is utilized as a white LED backlight driver, LEDs
with forward voltages up to 5.0V may be used. The
AAT3119 is available in two regulated output voltage versions: 4.5V and 5.0V. The output voltage
option selected will determine the maximum LED
forward voltage that can be driven. The trade-off
for the lower 4.5V output voltage version is the
device’s ability to supply greater output current.
Refer to the "Output Voltage vs. Output Current"
curves in the Typical Characteristics section of this
datasheet to determine the best AAT3119 output
voltage option based on the requirements of a
given application.
LED Ballast Resistors: To set the maximum
brightness of white LEDs connected in parallel from
a voltage source supply, a ballast resistor connected between each LED cathode and ground is
required. Refer to the application schematic in
Figure 1. The maximum brightness is determined
by the forward current (IF) through the respective
LED for a given forward voltage (VF). The typical
forward voltage of a specific LED is usually stated in
the typical characteristics of the given LED manufacturer's datasheet. The correct ballast resistor
value can be determined by the following equation:
RB =
(VOUT - VF)
IF
Where:
RB
=
Ballast resistor value in ohms (Ω)
VOUT =
Regulated charge pump output voltage
VF
=
LED forward voltage at the desired
forward current
IF
=
Desired LED forward current
3119.2007.02.1.2
AAT3119
High Efficiency 2X Charge Pump
CFLY
1μF
C1+
C1-
IN
VBATTERY
OUT
CIN
1μF
COUT
1μF
D1
D2
D3
D4
D5
D6
RB1
RB2
RB3
RB4
RB5
RB6
AAT3119
Enable
EN
GND
Figure 1: White LED Driver.
Flash LED Driver
The AAT3119 can source 250mA for pulsed loads
up to 500ms from an input supply as low as 3.3V.
This makes the device well suited for low-cost flash
LED driver applications in portable products.
Typically the 4.5V output version of the AAT3119
should be selected for photo-flash LED applications, as it can maintain better voltage regulation at
higher pulsed load current levels (refer to Figure 2).
The limitation of this option is that the greatest flash
LED forward voltage (VF) that can be driven is 4.5V
at the maximum set forward current (IF) for the
application. Flash LEDs with forward voltage (VF)
levels up to 5.0V can be driven by the AAT3119
5.0V output option. However, the maximum current for a 500ms pulse will be reduced. Refer to
the Typical Characteristics curves for peak output
current levels for a given minimum input voltage.
The forward current (IF) through the flash LED may
be determined with the use of a series ballast resistor. The typical forward voltage (VF) for the flash
LED in a given application should be derived from
the LED manufacturer's datasheet for the desired
3119.2007.02.1.2
forward current (IF) of the flash application. Once
the forward current has been determined, the flash
ballast resistor can be calculated using the following equation:
RF =
(VOUT - VF)
IF
Where:
RF
=
Flash ballast resistor value in ohms (Ω)
VOUT =
Regulated charge pump output voltage
(typically 4.5V)
VF
=
Flash LED forward voltage at the
desired forward current
IF
=
Desired flash LED forward current
The flash LED function can be controlled by the
AAT3119 enable pin in most applications. The
device start-up time into a maximum load is about
200μs, thus eliminating the need for pre-flash control synchronization.
13
AAT3119
High Efficiency 2X Charge Pump
CFLY
1μF
4.5V
VIN
IN
OUT
CIN
1μF
COUT
1μF
Flash LED
AAT3119
RF
Enable
EN
GND
Figure 2: Flash LED Application.
If a "light" or "movie" mode is also needed along
with the flash function, this can be accomplished
with the addition of a second ballast resistor with a
flash function gating MOSFET switch as shown in
Figure 3. Refer to the following equations for the
calculation of flash and light resistors, RF and RL.
(VOUT - VF)
RL =
IF
Where:
RL
=
Light mode ballast resistor value in
ohms (Ω)
VOUT =
Regulated charge pump output voltage
(typically 4.5V)
VF
=
Flash LED forward voltage at the
desired forward current
IF
=
Desired flash LED forward current in
the "light" mode
14
RF =
(VOUT - VF)
- RDS
IF
Where:
RF
=
Flash ballast resistor value in ohms (Ω)
RDS
=
Flash gating MOSFET on resistance
VOUT =
Regulated charge pump output voltage
(typically 4.5V)
VF
=
Flash LED forward voltage at the
desired forward current
IF
=
Desired flash LED forward current
3119.2007.02.1.2
AAT3119
High Efficiency 2X Charge Pump
CFLY
1μF
4.5V
VIN
IN
OUT
CIN
1μF
COUT
1μF
Flash LED
AAT3119
Enable
EN
RL
RF
GND
Flash Enable
Figure 3: Flash LED Driver with Gated Flash Application.
Layout Considerations
For the AAT3119, the high charge pump switching
frequencies and large peak transient currents
require careful printed circuit board layout. As a
general rule for charge pump boost converters, the
three external capacitors should be located as
closely as possible to the device package with minimum length trace connections. Maximize ground
plane around the AAT3119 charge pump and make
sure all external capacitor are connected to the
3119.2007.02.1.2
immediate power ground plane. A local component
side ground plane is recommended. If this is not
possible due to layout area limitations, assure
good ground connections by the use of large or
multiple printed circuit board vias.
Refer to the basic AAT3119 evaluation board layout shown in Figure 4 and the evaluation board
schematic shown in Figure 5 for an example of the
recommended charge pump layout design.
15
AAT3119
High Efficiency 2X Charge Pump
Figure 4: AAT3119 Evaluation Board Top Side Layout.
JP1
2
1
C1
1μF
R5
100K
U1
EN
1
4
EN
2
AAT3119
IN
VIN
GND
JP2
OUT
C+
3
1
2
VOUT
GND
C2
1μF
GND
C-
GND
5
GND
C3
1μF
6
7
8
DS1
DS2
R1
49.9
DS3
R2
49.9
DS4
R3
49.9
R4
49.9
Figure 5: AAT3119 Evaluation Board Schematic Diagram.
16
3119.2007.02.1.2
AAT3119
High Efficiency 2X Charge Pump
Quantity Designator Description
1
U1
1
4
R5
R1, R2,
R3, R4
JP1, JP2
EN
DS1, DS2,
DS3, DS4
C1, C2, C3
2
1
4
3
High Efficiency 2X
Charge Pump
100K 5% 1/8 W 0603
49.9Ω 1/8W 0805
Value Footprint Manufacturer Part Number
SC70JW-8
100K
49.9
Header, 2-Pin 2mm
Test Pin
White LED
Capacitor
1μF
AAT3119
0603
0805
Vishay
Vishay
CRCW----1003F
CRCW---49R9F
HDR1X2
PIN1
LED1206
Sullin
Mill Max
Osram
S2105-40-ND
6821-0-0001-00-00-08-0
LW-M673
0603
Murata
ECJ-1VB1AK05K
Table 1: AAT3119 Evaluation Board Bill of Materials.
3119.2007.02.1.2
17
AAT3119
High Efficiency 2X Charge Pump
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
SC70JW-8
MUXYY
AAT3119IJS-4.5-T1
SC70JW-8
MVXYY
AAT3119IJS-5.0-T1
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means
semiconductor products that are in compliance with current RoHS standards, including
the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more
information, please visit our website at http://www.analogictech.com/pbfree.
Package Information
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
7° ± 3°
0.45 ± 0.10
4° ± 4°
0.05 ± 0.05
0.15 ± 0.05
1.10 MAX
0.85 ± 0.15
0.048REF
2.10 ± 0.30
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is held on part numbers listed in BOLD.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work
rights, or other intellectual property rights are implied.
AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice, and advise customers to obtain the latest
version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability.
AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and
other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
18
3119.2007.02.1.2