Data Sheets - Skyworks Solutions, Inc.

DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
General Description
Features
The AAT1230/1230-1 is a high frequency, high efficiency
boost converter capable of 18V maximum output voltage. The internal power switch can deliver 100mA load
current. It is the ideal power solution to power OLED,
LCD, and CCD applications operating from a single cell
lithium-ion battery.
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Hysteretic control provides up to 2MHz switching frequency and fast response to load transients with small,
low-cost external components. The fully integrated control IC simplifies the design while reducing the total PCB
footprint. The AAT1230/1230-1 offers a true load disconnect feature which isolates the load from the power
source when EN/SET is pulled low. This eliminates leakage current and maintains zero voltage at the output
while disabled.
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The output voltage can be dynamically set by activating
one of two reference levels (FB1 or FB2) through the SEL
logic pin. Optionally, Skyworks' Simple Serial Control™
(S2Cwire™) single wire interface provides dynamic programmability across a wide output voltage range through
the EN/SET pin.
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VIN Range: 2.7V to 5.5V
Maximum Output: 18V @ 100mA
True Load Disconnect
Dynamic Voltage Control Options
Hysteretic Control
▪ No External Compensation Components
▪ Excellent Load Transient Response
▪ High Efficiency at Light Load
Up to 2MHz Switching Frequency
Ultra-Small Inductor and Capacitors
Integrated Low RDS(ON) MOSFET Switches
Up to 85% Efficiency
<1μA Shutdown Current
Integrated Soft Start
Two Turn-On Time Options
▪ AAT1230: TSS = 0.35ms
▪ AAT1230-1: TSS = 3.5ms
Cycle-by-Cycle Current Limit
Short-Circuit, Over-Temperature Protection
Available in TSOPJW-12 or TDFN34-16 Package
-40°C to +85°C Temperature Range
Applications
The AAT1230/1230-1 are available in a Pb-free, thermally-enhanced 16-pin 3x4mm TDFN low-profile package or
a Pb-free 12-pin TSOPJW package.
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CCD Bias Circuit
Digital Still Cameras
LCD Bias Circuit
Mobile Handsets
MP3 Players
OLED Displays
PDAs and Notebook PCs
Typical Application
L1
2.2μH
C1
2.2μF
VBAT
3.6V
VP
VIN
18V @ 100mA
LIN
AAT1230/
AAT1230-1
SW
R1
78.7kΩ
C2
2.2μF, 25V
FB1
PGND
Enable/Set
D1
Schottky
R2
562Ω
EN/SET
FB2
Select
SEL
GND
R3
4.99kΩ
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202053A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 12, 2012
1
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
Pin Descriptions
Pin #
TSOPJW-12
TDFN34-16
Symbol
1
15, 16
VP
2
14
EN/SET
3
13
SEL
4
5
12
11
VIN
N/C
6, 7
9, 10
SW
8
6, 7, 8
PGND
9
5
GND
10
4
FB2
11
3
FB1
12
1, 2
LIN
N/A
EP
Function
Input power pin; connected to the source of the P-channel MOSFET. Connect to the
input capacitor(s).
IC active high enable pin. Alternately, input pin for S2Cwire control utilizing FB2
reference.
Logic high selects FB1 high output reference; logic low selects FB2 low output reference. Pull low for S2Cwire control.
Input voltage for the converter. Connect this pin directly to the VP pin.
No connection.
Boost converter switching node. Connect the power inductor between this pin and
LIN pin.
Power ground for the boost converter; connected to the source of the N-channel
MOSFET. Connect to the input and output capacitor return.
Ground pin.
Feedback pin for low output voltage set point. Pin set to 0.6V when SEL is low and
disabled when SEL is high. Voltage is set from 0.6V to 1.2V with S2Cwire control.
Feedback pin for high output voltage set point. Pin set to 1.2V when SEL is high and
disabled when SEL is low. Disabled with S2Cwire control.
Switched power input. Connected to the power inductor.
Exposed paddle (bottom). Tied to SW pins. May be connected to SW pins or left
floating.
Pin Configuration
TSOPJW-12
(Top View)
VP
EN/SET
SEL
VIN
N/C
SW
2
1
12
2
11
3
10
4
9
5
8
6
7
TDFN34-16
(Top View)
LIN
FB1
FB2
GND
PGND
SW
LIN
LIN
FB1
FB2
GND
PGND
PGND
PGND
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
VP
VP
EN/SET
SEL
VIN
N/C
SW
SW
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202053A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 12, 2012
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
AAT1230/1230-1 Feature Options
Part Number
Soft Start Time, TSS
Package
AAT1230ITP
AAT1230IRN
AAT1230ITP-1
0.35ms
0.35ms
3.5ms
TSOPJW-12
TDFN34-16
TSOPJW-12
Absolute Maximum Ratings1
TA = 25°C, unless otherwise noted.
Symbol
Description
Value
Units
VIN
SW
LIN, EN/SET, SEL,
FB1, FB2
TJ
TS
TLEAD
Input Voltage
Switching Node
-0.3 to 6.0
20
V
V
VIN + 0.3
V
-40 to 150
-65 to 150
300
°C
°C
°C
Value
Units
Maximum Rating
Operating Temperature Range
Storage Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Recommended Operating Conditions
Symbol
Description
JA
Thermal Resistance
PD
Maximum Power Dissipation (TA = 25°C)
TDFN34-16
TSOPJW-12
TDFN34-16
TSOPJW-12
44
160
2270
625
°C/W
mW
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202053A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 12, 2012
3
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
Electrical Characteristics1
TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C, VIN = 3.6V.
Symbol
Description
Conditions
Min
Power Supply
Input Voltage Range
VIN
VOUT(MAX)
Maximum Output Voltage
VUVLO
IQ
ISHDN
IOUT
FB1
FB2
VLOADREG
VLINEREG/
VIN
RDS(ON)L
RDS(ON)IN
TSS
2.7
VIN Pin Shutdown Current
Output Current
FB1 Reference Voltage
FB2 Reference Voltage
Load Regulation
VIN Rising
Hysteresis
VIN Falling
SEL = GND, VOUT = 14V, IOUT = 0, Switching2
SEL = GND, FB2 = 1.5V, Not Switching
EN/SET = GND
2.7V < VIN < 5.5V, VOUT = 18V
IOUT = 0 to 100mA, VIN = 2.7V to 5.0V, SEL = High
IOUT = 0 to 100mA, VIN = 2.7V to 5.0V, SEL = Low
IOUT = 0 to 100mA
Line Regulation
VIN = 2.7V to 5.5V
UVLO Threshold
Quiescent Current
Over-Temperature Shutdown
Threshold
THYS
Shutdown Hysteresis
ILIM
N-Channel Current Limit
SEL, EN/SET
VSEL(L)
SEL Threshold Low
VSEL(H)
SEL Threshold High
VEN/SET(L)
Enable Threshold Low
VEN/SET(H)
Enable Threshold High
TEN/SET LO
EN/SET Low Time
TEN/SET HI MIN Minimum EN/SET High Time
TEN/SET HI MAX Maximum EN/SET High Time
TOFF
EN/SET Off Timeout
TLAT
EN/SET Latch Timeout
IEN/SET
EN/SET Input Leakage
From Enable to Output
Regulation; VOUT = 15V
2.0
40
1.164
0.582
AAT1230
AAT1230-1
VIN = 3.6V
=
=
=
=
2.7V
5.5V
2.7V
5.5V
Units
5.5
18
2.7
V
V
V
mV
V
mA
70
1.0
100
1.236
0.618
μA
150
TSD
VIN
VIN
VIN
VIN
Max
1.8
Low Side Switch On Resistance
Input Disconnect Switch On
Resistance
Soft-Start Time
Typ
1.2
0.6
0.01
μA
mA
V
V
%/mA
0.6
%/V
0.06

0.18

0.35
3.5
ms
ms
140
°C
15
3.0
°C
A
0.4
1.4
0.4
1.4
0.3
75
50
-1
75
500
500
1
V
V
V
V
μs
ns
μs
μs
μs
μA
1. The AAT1230/1230-1 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.
2. Total input current with prescribed FB resistor network can be reduced with larger resistor values.
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202053A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 12, 2012
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
Typical Characteristics
Efficiency vs. Load
DC Regulation
(VOUT = 18V)
(VOUT = 18V)
90
1.0
70
60
VIN = 3.6V
VIN = 4.2V
50
VIN = 5V
0.8
VIN = 5V
Output Error (%)
Efficiency (%)
80
40
30
0.6
0.4
0.2
VIN = 4.2V
0.0
-0.2
VIN = 3.6V
VIN = 2.7V
-0.4
-0.6
-0.8
20
-1.0
0.1
1
10
100
0.1
Output Current (mA)
Efficiency vs. Load
DC Regulation
(VOUT = 15V)
(VOUT = 15V)
100
1.0
0.8
Output Error (%)
VIN = 5V
80
Efficiency (%)
10
Output Current (mA)
90
70
60
VIN = 3.6V
VIN = 4.2V
50
40
30
VIN = 5V
0.6
0.4
0.2
VIN = 4.2V
0.0
-0.2
VIN = 3.6V
VIN = 2.7V
-0.4
-0.6
-0.8
-1.0
20
0.1
1
10
100
0.1
Output Current (mA)
DC Regulation
(VOUT = 12V)
(VOUT = 12V)
1.0
VIN = 3.6V
VIN = 4.2V
60
100
VIN = 5V
0.8
VIN = 5V
70
50
40
30
20
0.1
10
Efficiency vs. Load
Output Error (%)
80
1
Output Current (mA)
90
Efficiency (%)
1
0.6
0.4
0.2
0.0
VIN = 4.2V
-0.2
VIN = 3.6V
-0.4
VIN = 2.7V
-0.6
-0.8
-1.0
1
10
Output Current (mA)
100
0.1
1
10
100
Output Current (mA)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202053A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 12, 2012
5
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
Typical Characteristics
Line Regulation
Output Voltage Error vs. Temperature
(VOUT = 18V)
(VIN = 5V; VOUT = 18V; IOUT = 100mA)
0.2
2.00
0.1
IOUT = 60mA
1.00
Output Error (%)
Accuracy (%)
1.50
IOUT = 40mA
0.50
0.00
IOUT = 10µA
-0.50
-1.00
0.0
-0.1
-0.2
-0.3
-0.4
-1.50
-0.5
-40
-2.00
2.5
3
3.5
4
4.5
5
5.5
6
-15
No Load Input Current vs. Input Voltage
85
(VIN = 3.6V; VOUT = 18V)
1.78
Supply Current (mA)
3.0
Supply Current (mA)
60
No Load Input Current vs. Temperature
(VOUT = 18V; EN = High)
2.5
2.0
1.5
1.0
0.5
1.76
1.74
1.72
1.70
1.68
1.66
1.64
1.62
0.0
2.5
3
3.5
4
4.5
5
5.5
6
-40
-15
10
35
60
85
Temperature (°°C)
Input Voltage (V)
Output Ripple
Output Ripple
(VIN = 4.2V; VOUT = 18V; IOUT = 100mA)
(VIN = 3.6V; No Load; VOUT = 12V)
12.2
0.5
18.0
4.0
12.0
0.4
17.8
3.0
11.8
0.3
17.6
2.0
11.6
0.2
17.4
1.0
11.4
0.1
17.2
0.0
11.2
0
-1.0
17.0
Time (500ns/div)
Output Voltage
(top) (V)
5.0
-0.1
11.0
Time (500µs/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202053A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 12, 2012
Inductor Current
(bottom) (A)
18.2
Inductor Current
(bottom) (A)
Output Voltage
(top) (V)
35
Temperature (°°C)
Input Voltage (V)
6
10
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
Load Transient Response
Load Transient Response
(VIN = 4.2V; IOUT = 20mA–60mA; VOUT = 18V)
(VIN = 3.6V; IOUT = 20mA–60mA; VOUT = 12V)
18.05
1.2
18.00
0.9
17.95
0.6
17.90
0.3
17.85
0.0
17.80
-0.3
Output Voltage (V) (top)
1.5
12.10
1.50
12.05
1.20
12.00
0.90
11.95
0.60
11.90
0.30
11.85
0.00
-0.30
11.80
Time (200µs/div)
Time (200µs/div)
P-Channel RDS(ON) vs. Input Voltage
N-Channel RDS(ON) vs. Input Voltage
110
300
280
120°C
100°C
100
240
RDS(ON) (mΩ
Ω)
RDS(ON) (mΩ
Ω)
260
220
200
180
160
25°C
140
85°C
120°C
90
2.5
3
3.5
4
4.5
5
5.5
6
70
60
85°C
25°C
40
2.5
Input Voltage (V)
3
3.5
4
4.5
5
5.5
AAT1230-1 Soft Start
(VIN = 3.6V; CIN = 2.2µF; IOUT = 100mA; VOUT = 18V)
2.8
12
2.4
8
2.0
4
1.6
0
1.2
-4
0.8
-8
0.4
-12
0.0
-16
-0.4
20
2.8
15
2.4
10
2.0
5
1.6
0
1.2
-5
0.8
-10
0.4
-15
0.0
-20
-0.2
Input Current
(bottom) (A)
16
Enable Voltage (middle) (V)
Output Voltage (top) (V)
AAT1230 Soft Start
(VIN = 3.6V; CIN = 2.2µF; IOUT = 100mA; VOUT = 12V)
Time (200µs/div)
6
Input Voltage (V)
Input Current
(bottom) (A)
Enable Voltage (middle) (V)
Output Voltage (top) (V)
100°C
80
50
120
100
Inductor Current (A) (bottom)
18.10
Inductor Current (A) (bottom)
Output Voltage (V) (top)
Typical Characteristics
Time (1ms/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202053A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 12, 2012
7
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
Functional Block Diagram
VIN
LIN
VP
Soft-Start
Timer
EN/SET
SW
Control
FB1
VREF1
Output
Select
VREF2
FB2
SEL
GND
Functional Description
The AAT1230/1230-1 consists of a DC/DC boost controller, an integrated slew rate controlled input disconnect
MOSFET switch, and a MOSFET power switch. A high
voltage rectifier, power inductor, output capacitor, and
resistor divider network are required to implement a DC/
DC boost converter.
Control Loop
The AAT1230/1230-1 provides the benefits of current
mode control with a simple hysteretic feedback loop. The
device maintains exceptional DC regulation, transient
response, and cycle-by-cycle current limit without additional compensation components.
The AAT1230/1230-1 modulates the power MOSFET
switching current in response to changes in output volt-
8
PGND
age. This allows the voltage loop to directly program the
required inductor current in response to changes in the
output load.
The switching cycle initiates when the N-channel MOSFET
is turned ON and current ramps up in the inductor. The
ON interval is terminated when the inductor current
reaches the programmed peak current level. During the
OFF interval, the input current decays until the lower
threshold, or zero inductor current, is reached. The lower
current is equal to the peak current minus a preset hysteresis threshold - which determines the inductor ripple
current. The peak current is adjusted by the controller
until the output current requirement is met.
The magnitude of the feedback error signal determines
the average input current. Therefore, the AAT1230/12301 controller implements a programmed current source
connected to the output capacitor and load resistor.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202053A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 12, 2012
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
There is no right-half plane zero, and loop stability is
achieved with no additional compensation components.
Increased load current results in a drop in the output
feedback voltage (FB1 or FB2) sensed through the feedback resistors (R1, R2, R3). The controller responds by
increasing the peak inductor current, resulting in higher
average current in the inductor. Alternatively, decreased
output load results in an increase in the output feedback
voltage (FB1 or FB2 pin). The controller responds by
decreasing the peak inductor current, resulting in lower
average current in the inductor.
At light load, the inductor OFF interval current goes
below zero and the boost converter enters discontinuous
mode operation. Further reduction in the load results in
a corresponding reduction in the switching frequency.
The AAT1230/1230-1 provide pulsed frequency operation which reduces switching losses and maintains high
efficiency at light loads.
Operating frequency varies with changes in the input
voltage, output voltage, and inductor size. Once the
boost converter has reached continuous mode, further
increases in the output load will not significantly change
the operating frequency. A small 2.2μH (±20%) inductor
is selected to maintain high frequency switching (up to
2MHz) and high efficiency operation for outputs from
10V to 18V.
Output Voltage Programming
The output voltage may be programmed through a resistor divider network located from output capacitor to FB1/
FB2 pins to ground. Pulling the SEL pin high activates the
FB1 pin which maintains a 1.2V reference voltage, while
the FB2 reference is disabled. Pulling the SEL pin low
activates the FB2 pin which maintains a 0.6V reference,
while the FB1 reference is disabled. This function allows
dynamic selection between two distinct output voltages
across a 2X range (maximum). An additional resistor
between FB1 and FB2 allows the designer to program the
outputs across a reduced <2X range.
Alternatively, the output voltage may be dynamically
programmed to any of 16 voltage levels using the
S2Cwire serial digital input. The single wire S2Cwire interface provides high-speed output voltage programmability across a 2X output voltage range. S2Cwire functionality is enabled by pulling the SEL pin low and providing
S2Cwire digital clock input to the EN/SET pin. Table 2
details the FB2 reference voltage versus S2Cwire rising
clock edges.
Soft Start / Enable
The input disconnect switch is activated when a valid
input voltage is present and the EN/SET pin is pulled
high. The slew rate control on the P-channel MOSFET
ensures minimal inrush current as the output voltage is
charged to the input voltage, prior to switching of the
N-channel power MOSFET. Monotonic turn-on is guaranteed by the built-in soft-start circuitry. Soft-start eliminates output voltage overshoot across the full input
voltage range and all loading conditions.
Fast and slow start-up time options are available. The
AAT1230 provides start-up to regulated output voltage
within 0.35ms of a low-to-high transition on the EN/SET
pin. Alternatively, the AAT1230-1 provides start-up to
regulated output voltage within 3.5ms of a low-to-high
transition on the EN/SET pin, which dramatically reduces
inrush current. A longer soft-start, or turn-on, time is a
preferred feature in battery-powered systems that
exhibit higher source impedances.
Some applications may require the output to be active
when a valid input voltage is present. In these cases,
add a 10k resistor between the VIN, VP, and EN/SET
pins to avoid startup issues.
Current Limit and
Over-Temperature Protection
The switching of the N-channel MOSFET terminates
when current limit of 3.0A (typical) is exceeded. This
minimizes power dissipation and component stresses
under overload and short-circuit conditions. Switching
resumes when the current decays below the current
limit.
Thermal protection disables the AAT1230/1230-1 when
internal dissipation becomes excessive. Thermal protection disables both MOSFETs. The junction over-temperature threshold is 140°C with -15°C of temperature hysteresis. The output voltage automatically recovers when
the over-temperature or over-current fault condition is
removed.
Under-Voltage Lockout
Internal bias of all circuits is controlled via the VIN input.
Under-voltage lockout (UVLO) guarantees sufficient VIN
bias and proper operation of all internal circuitry prior to
soft start.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202053A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 12, 2012
9
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
R4
10K
JP1
VIN
3
2
1
Enable
JP2
3
2
1
C1
2.2μF
1
2
3
4
5
6
VP
LIN
EN/SET FB1
SEL
FB2
VIN
GND
N/C
PGND
SW
SW
D1
Schottky
L1
2.2μH
U1
12
11
10
9
8
7
VOUT
R1
78.7k
C2
2.2μF
R2
562
R3
4.99k
Select
U1 AAT1230/1230-1 TSOPJW12
C1 10V 0603 2.2μF
C2 25V 0805 2.2μF
D1 30V 0.5A MBR0530T1 SOD-123
L1 2.2μH SD3814-2R2
R1 78.7k 0603
R2 562 0603
R3 4.99k 0603
R4 10k 0603
Figure 1: AAT1230/1230-1 Demo Board Schematic.
Application Information
Selecting the Output Diode
To ensure minimum forward voltage drop and no recovery, high voltage Schottky diodes are considered the
best choice for the AAT1230/1230-1 boost converter.
The AAT1230/1230-1 output diode is sized to maintain
acceptable efficiency and reasonable operating junction
temperature under full load operating conditions. Forward
voltage (VF) and package thermal resistance (JA) are the
dominant factors to consider in selecting a diode. The
diode’s published current rating may not reflect actual
operating conditions and should be used only as a comparative measure between similarly rated devices. 20V
rated Schottky diodes are recommended for outputs less
than 15V, while 30V rated Schottky diodes are recommended for outputs greater than 15V.
The switching period is divided between ON and OFF
time intervals.
1
= TON + TOFF
FS
During the ON time, the N-channel power MOSFET is
conducting and storing energy in the boost inductor.
During the OFF time, the N-channel power MOSFET is
not conducting. Stored energy is transferred from the
10
input battery and boost inductor to the output load
through the output diode. Duty cycle is defined as the
ON time divided by the total switching interval.
D=
TON
TON + TOFF
= TON ⋅ FS
The maximum duty cycle can be estimated from the
relationship for a continuous mode boost converter.
Maximum duty cycle (DMAX) is the duty cycle at minimum
input voltage (VIN(MIN)).
DMAX =
(VOUT + VF - VIN(MIN))
(VOUT + VF)
The average diode current during the OFF time can be
estimated.
IAVG(OFF) =
IOUT
1 - DMAX
The following curves show the VF characteristics for different Schottky diodes (100°C case). The VF of the
Schottky diode can be estimated from the average current during the off time.
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DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
A better estimate of DMAX is possible when VF is known.
B340LA
DMAX =
MBR0530
1000
(VOUT + VF - VIN(MIN))
(VOUT + VF)
ZHCS350
BAT42W
10
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
Forward Voltage (V)
The average diode current is equal to the output current.
IAVG(TOT) = IOUT
The average output current multiplied by the forward
diode voltage determines the loss of the output diode.
PLOSS(DIODE) = IAVG(TOT) · VF
= IOUT · VF
Diode junction temperature can be estimated.
TJ(DIODE) = TAMB + ΘJA · PLOSS(DIODE)
Output diode junction temperature should be maintained
below 110ºC, but may vary depending on application
and/or system guidelines. The diode JA can be minimized with additional PCB area on the cathode. PCB
heatsinking the anode may degrade EMI performance.
The reverse leakage current of the rectifier must be considered to maintain low quiescent (input) current and
high efficiency under light load. The rectifier reverse current increases dramatically at high temperatures.
Selecting the Boost Inductor
The AAT1230/1230-1 controller utilizes hysteretic control and the switching frequency varies with output load
and input voltage. The value of the inductor determines
the maximum switching frequency of the AAT1230/12301 boost converter. Increased output inductance decreases the switching frequency, resulting in higher peak currents and increased output voltage ripple. To maintain
2MHz maximum switching frequency and stable operation, an output inductor sized from 1.5μH to 2.7μH is
recommended.
Where VF is the Schottky diode forward voltage. If not
known, it can be estimated at 0.5V. Manufacturer’s specifications list both the inductor DC current rating, which
is a thermal limitation, and peak inductor current rating,
which is determined by the saturation characteristics.
Measurements at full load and high ambient temperature
should be completed to ensure that the inductor does not
saturate or exhibit excessive temperature rise.
The output inductor (L) is selected to avoid saturation at
minimum input voltage, maximum output load conditions. Peak current may be estimated using the following
equation, assuming continuous conduction mode. Worstcase peak current occurs at minimum input voltage
(maximum duty cycle) and maximum load. Switching
frequency can be estimated from the curves and assumes
a 2.2μH inductor.
Switching Frequency (MHz)
100
2.0
VIN = 3.0V
VOUT = 18V
1.8
VIN = 3.0V
VOUT = 15V
1.6
VIN = 3.6V
VOUT = 18V
1.4
VIN = 3.6V
VOUT = 15V
1.2
1.0
0.8
0.6
VIN = 2.7V
VOUT = 18V
0.4
40
VIN = 2.7V
VOUT = 15V
50
60
70
80
90
100
Output Current (mA)
Switching Frequency (MHz)
Forward Current (mA)
10000
2.0
1.8
VIN = 3.0V
VOUT = 12V
1.6
VIN = 3.0V
VOUT = 10V
VIN = 3.6V
VOUT = 12V
VIN = 3.6V
VOUT = 10V
1.4
1.2
1.0
0.8
VIN = 2.7V
VOUT = 10V
0.6
0.4
40
50
VIN = 2.7V
VOUT = 12V
60
70
80
90
100
Output Current (mA)
IPEAK =
IOUT
D
· VIN(MIN)
+ MAX
(1 - DMAX)
(2 · FS · L)
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11
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
At light load and low output voltage, the controller
reduces the operating frequency to maintain maximum
operating efficiency. As a result, further reduction in output load does not reduce the peak current. Minimum
peak current can be estimated from 0.5A to 0.75A.
The RMS current flowing through the boost inductor is
equal to the DC plus AC ripple components. Under worstcase RMS conditions, the current waveform is critically
continuous. The resulting RMS calculation yields worstcase inductor loss. The RMS current value should be
compared against the manufacturer’s temperature rise,
or thermal derating, guidelines.
IRMS =
IPEAK
3
For a given inductor type, smaller inductor size leads to
an increase in DCR winding resistance and, in most
cases, increased thermal impedance. Winding resistance
degrades boost converter efficiency and increases the
inductor’s operating temperature.
PLOSS(INDUCTOR) = IRMS2 · DCR
To ensure high reliability, the inductor temperature
should not exceed 100ºC. In some cases, PCB heatsinking applied to the AAT1230/1230-1 LIN node (non-switching) can improve the inductor’s thermal capability. PCB
heatsinking may degrade EMI performance when applied
to the SW node (switching) of the AAT1230/1230-1.
Shielded inductors provide decreased EMI and may be
required in noise sensitive applications. Unshielded chip
inductors provide significant space savings at a reduced
cost compared to shielded (wound and gapped) inductors. In general, chip-type inductors have increased
winding resistance (DCR) when compared to shielded,
wound varieties.
Selecting the Boost Capacitors
The high output ripple inherent in the boost converter
necessitates low impedance output filtering. Multi-layer
ceramic (MLC) capacitors provide small size and adequate capacitance, low parasitic equivalent series resistance (ESR) and equivalent series inductance (ESL), and
are well suited for use with the AAT1230/1230-1 boost
regulator. MLC capacitors of type X7R or X5R are recommended to ensure good capacitance stability over the full
operating temperature range.
12
The output capacitor is sized to maintain the output load
without significant voltage droop (VOUT) during the
power switch ON interval, when the output diode is not
conducting. A ceramic output capacitor from 2.2μF to
4.7μF is recommended. Typically, 25V rated capacitors
are required for the 18V boost output. Ceramic capacitors sized as small as 0805 are available which meet
these requirements.
MLC capacitors exhibit significant capacitance reduction
with applied voltage. Output ripple measurements should
confirm that output voltage droop is acceptable. Voltage
derating can minimize this factor, but results may vary
with package size and among specific manufacturers.
Output capacitor size can be estimated at a switching
frequency (FSW) of 500kHz (worst-case).
COUT =
IOUT · DMAX
FS · ΔVOUT
The boost converter input current flows during both ON
and OFF switching intervals. The input ripple current is
less than the output ripple and, as a result, less input
capacitance is required. A ceramic output capacitor from
1μF to 3.3μF is recommended. Minimum 6.3V rated
ceramic capacitors are required at the input. Ceramic
capacitors sized as small as 0603 are available which
meet these requirements.
The AAT1230/1230-1 provides excellent load transient
response, but large capacitance tantalum or solid-electrolytic capacitors may be desired. These can replace (or be
used in parallel with) ceramic capacitors. Both tantalum
and OSCON-type capacitors are suitable due to their low
ESR and excellent temperature stability (although they
exhibit much higher ESR than MLC capacitors). Aluminumelectrolytic types are less suitable due to their high ESR
characteristics and temperature drift. Unlike MLC capacitors, these types are polarized and proper orientation on
input and output pins is required. 30% to 70% voltage
derating is recommended for tantalum capacitors.
Setting the Output Voltage
The output voltage may be programmed through a resistor divider network located from the output to FB1 and
FB2 pins to ground. Pulling the SEL pin high activates the
FB1 pin which maintains a 1.2V reference voltage, while
the FB2 reference is disabled. Pulling the SEL pin low
activates the FB2 pin which maintains a 0.6V reference,
while the FB1 reference is disabled.
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DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
The AAT1230/1230-1 output voltage can be programmed
by one of three methods. First, the output voltage can
be static by pulling the SEL logic pin either high or low.
Second, the output voltage can be dynamically adjusted
between two pre-set levels within a 2X operating range
by toggling the SEL logic pin. Third, the output can be
dynamically adjusted to any of 16 preset levels within a
2X operating range using the integrated S2Cwire single
wire interface via the EN/SET pin.
Option 1: Static Output Voltage
A static output voltage can be configured by pulling the
SEL either high or low. SEL pin high activates the FB1
reference pin to 1.2V (nominal). Alternatively, the SEL
pin is pulled low to activate the FB2 reference at 0.6V
(nominal). Table 1 provides details of resistor values for
common output voltages from 10V to 18V for SEL = High
and SEL = Low options.
In the static configuration, the FB1 pin should be directly
connected to FB2. The resistor between FB1 and FB2 pins
is not required. See Table 1 for static output voltages with
SEL = High or SEL = Low. SEL = High corresponds to
VOUT(1) and SEL = Low corresponds to VOUT(2).
Option 2: Dynamic Voltage
Control Using SEL Pin
The output may be dynamically adjusted between two
output voltages by toggling the SEL logic pin. Output
voltages VOUT(1) and VOUT(2) correspond to the two output
references, FB1 and FB2. Pulling the SEL logic pin high
activates VOUT(1), while pulling the SEL logic pin low activates VOUT(2).
The minimum output voltage must be greater than the
specified maximum input voltage plus margin to maintain proper operation of the AAT1230/1230-1 boost converter. In addition, the ratio of output voltages VOUT(2)/
VOUT(1) is always less than 2.0, corresponding to a 2X
(maximum) programmable range.
R3 = 4.99kΩ
VOUT(1)
(SEL = High)
VOUT(2)
(SEL = Low)
R1 (kΩ)
R2 (kΩ)
10.0V
12.0V
15.0V
16.0V
18.0V
–
–
–
–
–
12.0V
15.0V
16.0V
18.0V
15.0V
16.0V
18.0V
18.0V
–
–
–
–
–
10.0V
12.0V
15.0V
16.0V
18.0V
10.0V
10.0V
10.0V
10.0V
12.0V
12.0V
12.0V
15.0V
36.5
44.2
57.6
61.9
69.8
78.7
95.3
121
127
143
75
76.8
76.8
78.7
90.9
93.1
93.1
115
0
0
0
0
0
0
0
0
0
0
3.32
1.65
1.24
0.562
3.01
2.49
1.65
3.32
Table 1: SEL Pin Voltage Control Resistor Values
(1% resistor tolerance).
Option 3: Dynamic Voltage
Control Using S2Cwire Interface
The output can be dynamically adjusted by the host controller to any of 16 pre-set output voltage levels using
the integrated S2Cwire interface. The EN/SET pin serves
as the S2Cwire interface input. The SEL pin must be
pulled low when using the S2Cwire interface.
S2Cwire Serial Interface
Skyworks' S2Cwire serial interface is a proprietary highspeed single-wire interface available only from Skyworks.
The S2Cwire interface records rising edges of the EN/SET
input and decodes into 16 different states. Each state
corresponds to a voltage setting on the FB2 pin, as
shown in Table 2.
See Table 1 for dynamic output voltage settings when
toggling between SEL = High and SEL = Low. SEL = High
corresponds to VOUT(1) and SEL = Low corresponds to
VOUT(2).
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13
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
S2Cwire Serial Interface Timing
PCB Layout Guidelines
The S Cwire serial interface has flexible timing. Data can
be clocked-in at speeds up to 1MHz. After data has been
submitted, EN/SET is held high to latch the data for a
period TLAT. The output is subsequently changed to the
predetermined voltage. When EN/SET is set low for a
time greater than TOFF, the AAT1230/1230-1 is disabled.
When disabled, the register is reset to the default value,
which sets the FB2 pin to 0.6V if EN is subsequently
pulled high.
Boost converter performance can be adversely affected
by poor layout. Possible impact includes high input and
output voltage ripple, poor EMI performance, and
reduced operating efficiency. Every attempt should be
made to optimize the layout in order to minimize parasitic PCB effects (stray resistance, capacitance, inductance) and EMI coupling from the high frequency SW
node.
2
A suggested PCB layout for the AAT1230/1230-1 boost
converter is shown in Figures 3 and 4. The following PCB
layout guidelines should be considered:
S2Cwire Output Voltage Programming
The AAT1230/1230-1 is programmed through the
S2Cwire interface according to Table 2. The rising clock
edges received through the EN/SET pin determine the
feedback reference and output voltage set-point. Upon
power up with the SEL pin low and prior to S2Cwire programming, the default feedback reference voltage is set
to 0.6V.
EN/SET
Rising
Edges
FB2
Reference
Voltage (V)
EN/SET
Rising
Edges
FB2
Reference
Voltage (V)
1
2
3
4
5
6
7
8
0.60 (Default)
0.64
0.68
0.72
0.76
0.80
0.84
0.88
9
10
11
12
13
14
15
16
0.92
0.96
1.00
1.04
1.08
1.12
1.16
1.20
1.
2.
3.
4.
5.
Table 2: S2Cwire Voltage Control Settings
(SEL = Low).
6.
7.
Minimize the distance from Capacitor C1 and C2
negative terminal to the PGND pins. This is especially true with output capacitor C2, which conducts
high ripple current from the output diode back to the
PGND pins.
Place the feedback resistors close to the output terminals. Route the output pin directly to resistor R1 to
maintain good output regulation. R3 should be routed close to the output GND pin, but should not share
a significant return path with output capacitor C2.
Minimize the distance between L1 to D1 and switching pin SW; minimize the size of the PCB area connected to the SW pin.
Maintain a ground plane and connect to the IC RTN
pin(s) as well as the GND terminals of C1 and C2.
Consider additional PCB area on D1 cathode to
maximize heatsinking capability. This may be necessary when using a diode with a high VF and/or thermal resistance.
When using the TDFN33-12 package, connect paddle
to SW pin or leave floating. Do not connect to RTN/
GND conductors.
To avoid problems at startup, add a 10k resistor
between the VIN, VP and EN/SET pins (R4). This is
critical in applications requiring immunity from input
noise during “hot plug” events, e.g. when plugged
into an active USB port.
THI
TLO
TOFF
T LAT
EN/SET
1
Data Reg
2
n-1
0
n ≤ 16
n
0
Figure 2: S2Cwire Timing Diagram to Program the Output Voltage.
14
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DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
Figure 3: AAT1230/1230-1 Evaluation
Board Top Side.
Figure 4: AAT1230/1230-1 Evaluation
Board Bottom Side.
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15
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
Boost Converter Design Example
Specification
VOUT
IOUT
VIN
TAMB
=
=
=
=
16V
100mA
2.7V to 4.2V (3.6V nominal)
50°C
Schottky Diode
DMAX =
VO - VIN(MIN) 16 - 2.7
=
= 0.831
VIN(MIN)
2.7
IOFF(DIODE) =
IOUT
0.1A
=
= 0.592A = 592mA
1 - DMAX 1 - 0.831
For Schottky diode MBR0530, VF
0.32 @ 600mA, JA
206°C/W in SOD-123 package.
PLOSS(DIODE) = IOUT · VF = (0.1A)(0.32V) = 0.032W = 32mW
TJ(DIODE) = TAMB + θJA · PLOSS(DIODE)
= 50 + 206 · (0.032)
= 50 + 6.6
= 56.6°C
16V Output Inductor
DMAX =
=
VOUT + VF - VIN(MIN)
VOUT + VF
16 + 0.32 - 2.7
= 0.834
16 + 0.32
From Switching Frequency vs. IOUT curves estimated switching frequency of AAT1230/1230-1 with VOUT = 16V and IOUT
= 100mA, FSW = 800kHz.
IPEAK =
=
IOUT
D
· VIN(MIN)
+ MAX
1 - DMAX
(2 · FS · L)
0.100
0.834 (2.7V)
+
1 - 0.840
2 · 0.8M · 2.2µH
= 0.625 + 0.640
IRMS =
16
IPEAK
3
=
1265
3
= 730mA
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DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
For Coiltronics inductor SD3814-2R2, ISAT = 1.90A, IRMS(MAX) = 1.43A and DCR = 77m.
PLOSS(INDUCTOR) = IRMS2 · DCR
= (0.730)2 (0.077)
= 0.041W
= 41mW
16V Output Capacitor
ΔVOUT = 0.1V
COUT =
IOUT · DMAX
(0.1A) (0.84)
=
FS · ΔVOUT
(0.8kHz) (0.1V)
= 1.05µF; use 2.2µF/25V MLC
AAT1230/1230-1 Losses
DMAX
3
IRMS(ON) = IPEAK ·
0.834
3
= 1.270
= 0.527A
= 527mA
(1 - DMAX)
3
IRMS(OFF) = IPEAK ·
0.166
3
= 1.270
= 0.298A
= 298mA
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17
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
From datasheet curves, VIN = 3.6V, TCASE = 100°C, TSOPJW-12:
RDS(ON)L = 75m, RDS(ON)IN = 220m, JA = 160°C/W.
PLOSS(RDSON) = IRMS(ON)2 · (RDS(ON)L + RDS(ON)IN) + IRMS(OFF)2 · RDS(ON)IN
= 0.5272 (0.220 + 0.075) + 0.2982 · 0.075
= 0.082 + 0.007
= 89mW
TJ(MAX) = TAMB + θJA · PLOSS(RDSON)
= 50 + 160 (0.089)
= 50 + 14.2
= 64.2°C
18
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DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
Manufacturer
Diodes, Inc.
ON Semi
Zetex
Part Number
Rated IF(AV)
Current (A)1
Rated Voltage
(V)
Thermal Resistance
(ΘJA, °C/W)1
Case
B340LA
SD103AWS
BAT42WS
B0520WS
MBR130LSFT
MBR0530T
ZHCS350
BAT54
3.00
0.35
0.20
0.50
1.00
0.50
0.35
0.20
40
30
30
20
30
30
40
30
25
625
625
426
325
206
330
330
SMA
SOD-323
SOD-323
SOD-323
SOD-123
SOD-123
SOD-523
SOT-23
Table 3: Typical Surface Mount Schottky Rectifiers for Various Output Loads.
(select TJ < 110°C in application circuit).
Manufacturer
Part Number
Inductance (μH)
Max DC ISAT
Current (A)
DCR ()
Size (mm)
LxWxH
Type
Sumida
Sumida
Murata
Murata
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Coiltronics
Coiltronics
Coiltronics
CDR4D11/HP-2R4
CDRH4D18-2R2
LQH55DN2R2M03
LQY33PN2R2M02
NR40182R2
NR30152R2
NR40102R2
CBC3225T2R2MR
SD3814-2R2
SD3114-2R2
SD3112-2R2
2.4
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
1.70
1.32
3.20
0.72
2.70
1.48
1.15
1.13
1.90
1.48
1.12
105
75
29
360
60
60
150
80
77
86
140
4.8x4.8x1.2
5.0x5.0x2.0
5.0x5.7x4.7
3.2x3.2x0.85
4.0x4.0x1.8
3.0x3.0x1.5
4.0x4.0x1.0
3.2x2.5x2.5
3.8x3.8x1.4
3.1x3.1x1.4
3.1x3.1x1.2
Shielded
Shielded
Non-Shielded
Non-Shielded
Shielded
Shielded
Shielded
Non-Shielded
Shielded
Shielded
Shielded
Table 4: Typical Surface Mount Inductors for Various Output Loads
(select IPEAK < ISAT).
Manufacturer
Part Number
Type
Value (μF)
Voltage (V)
Temp. Co.
Footprint
LxWxH (mm)
Murata
Murata
Murata
Murata
Murata
GRM188R60J475KE19D
GRM188R61A225KE34D
GRM188R61C225KA88
GRM21BR61E225KA12L
GRM188R61E105KA12D
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
2.2
2.2
2.2
2.2
1.0
6.3
10
16
25
25
X5R
X5R
X5R
X5R
X5R
0603
0603
0805
0805
0603
Table 5: Typical Surface Mount Capacitors for Various Output Loads.
1. Results may vary depending on test method used and specific manufacturer.
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19
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
TSOPJW-12
TDFN34-16
TSOPJW-12
RDXYY
RDXYY
TJXYY
AAT1230ITP-T1
AAT1230IRN-T1
AAT1230ITP-1-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 Information3
TSOPJW-12
2.85 ± 0.20
2.40 ± 0.10
0.20 + 0.10
- 0.05
0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC
7° NOM
0.04 REF
0.055 ± 0.045
0.15 ± 0.05
+ 0.10
1.00 - 0.065
0.9625 ± 0.0375
3.00 ± 0.10
4° ± 4°
0.45 ± 0.15
0.010
2.75 ± 0.25
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202053A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 12, 2012
DATA SHEET
AAT1230
18V, 100mA Step-Up Converter
TDFN34-16
3.000 ± 0.050
1.600 ± 0.050
Detail "A"
3.300 ± 0.050
4.000 ± 0.050
Index Area
0.350 ± 0.100
Top View
0.230 ± 0.050
Bottom View
C0.3
(4x)
0.050 ± 0.050
0.450 ± 0.050
0.850 MAX
Pin 1 Indicator
(optional)
0.229 ± 0.051
Side View
Detail "A"
All dimensions in millimeters.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202053A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 12, 2012
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