ADP1109AR-ADP1109AR-12-ADP1109AR-3.3-ADP1109AR-5 Fast Delivery |IC PHOENIX CO.,LIMITED

ADP1109AR-5 ,Micropower Low Cost Fixed 3.3 V, 5 V, 12 V and Adjustable DC-to-DC ConverterFEATURESFUNCTIONAL BLOCK DIAGRAMSOperates at Supply Voltages 2 V to 12 VVFixed 3.3 V, 5 V, 12 V and ..
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ADP1110AR-5 ,Micropower, Step-Up/Step-Down Switching Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 Vapplications that use a single cell as the primary powerCOMPARATOR DRIVERsource.The ADP1110 can be ..
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ADP1109AR-ADP1109AR-12-ADP1109AR-3.3-ADP1109AR-5
Micropower Low Cost Fixed 3.3 V, 5 V, 12 V and Adjustable DC-to-DC Converter
REV.0
Micropower Low Cost
Fixed 3.3 V, 5 V, 12 V and Adjustable
DC-to-DC Converter
FUNCTIONAL BLOCK DIAGRAMS
Fixed Output
Adjustable Output
FEATURES
Operates at Supply Voltages 2 V to 12 V
Fixed 3.3 V, 5 V, 12 V and Adjustable Output
Minimum External Components Required
Ground Current: 320 mA
Oscillator Frequency: 120 kHz
Logic Shutdown
8-Lead DIP and SO-8 Packages
APPLICATIONS
Cellular Telephones
Single-Cell to 5 V Converters
Laptop and Palmtop Computers
Pagers
Cameras
Battery Backup Supplies
Portable Instruments
Laser Diode Drivers
Hand-Held Inventory Computers
GENERAL DESCRIPTION
The ADP1109 is a versatile step-up switching regulator. The
device requires only minimal external components to operate as
a complete switching regulator.
The ADP1109-5 can deliver 100 mA at 5 V from a 3 V input
and the ADP1109-12 can deliver 60 mA at 12 V from a 5 V
input. The device also features a logic controlled shutdown
capability that, when a logic low is applied, will shut down the
oscillator.
The 120 kHz operating frequency allows for the use of small
surface mount components. The gated oscillator capability
eliminates the need for frequency compensation.
TYPICAL APPLICATION
Flash Memory VPP Generator
ADP1109–SPECIFICATIONS
COMPARATOR TRIP POINT
OUTPUT VOLTAGE RIPPLE
OSCILLATOR FREQUENCY
SWITCH SATURATION VOLTAGE
NOTES
All limits at temperature extremes are guaranteed via correlation using standard quality control methods.
Specifications subject to change without notice.
(08C ≤ TA ≤ +708C, VIN = 3 V unless otherwise noted)
Figure 1.2V to 5V Converter
Figure 2.2V to 12V Converter
Figure 3.2 V to 5 V Converter
With Shutdown
PIN FUNCTION DESCRIPTIONS
ORDERING GUIDE
PIN CONFIGURATIONS
8-Lead Plastic DIP
(N-8)
NC = NO CONNECT
*FIXED VERSIONS
VIN
FB(SENSE)*
SHUTDOWNGND
8-Lead SOIC
(SO-8)
NC = NO CONNECT
*FIXED VERSIONS
VIN
GND
FB(SENSE)*
SHUTDOWN
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADP1109 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage, VOUT . . . . . . . . . . . . . . . . . . . . –0.4 V to 20 V
SW Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . –0.4 V to 50 V
Shutdown Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0 V
Switch Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 A
Maximum Power Dissipation . . . . . . . . . . . . . . . . . . 300 mW
Operating Temperature Range . . . . . . . . . . . . 0°C to +70°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . +300°C
*This is a stress rating only; operation beyond these limits can cause the device to
be permanently damaged.
ADP1109
INPUT VOLTAGE – V
OSCILLATOR FREQUENCY – kHz81012141618
121.5
Figure 4.Oscillator Frequency vs.
Input Voltage
TEMPERATURE – 8C
OSCILLATOR FREQUENCY – kHz
0257085
Figure 7.Oscillator Frequency vs.
Temperature
TEMPERATURE – 8C
CE(SAT)
– V
0.39
Figure 10.Switch Saturation Voltage
vs. Temperature
SWITCH CURRENT – A
CESAT
– V
0.4
Figure 5.Switch Saturation Voltage
vs. Switch Current
TEMPERATURE – 8C
SWITCH-ON TIME –
3.7
Figure 8.Switch-On Time vs.
Temperature
TEMPERATURE – 8C
QUIESCENT CURRENT –
500
Figure 11.Quiescent Current vs.
Temperature
Figure 6.Quiescent Current vs.
Input Voltage
Figure 9.Duty Cycle vs. Temperature
–Typical Performance Characteristics
APPLICATION INFORMATION
THEORY OF OPERATION
The ADP1109 is a flexible, low power switch-mode power sup-
ply (SMPS) controller for step-up dc/dc converter applications.
This device uses a gated-oscillator technique to provide very
high performance with low quiescent current. For example,
more than 2 W of output power can be generated from a +5 V
source, while quiescent current is only 450 μA.
A functional block diagram of the ADP1109 is shown on page 1.
The internal 1.25 V reference is connected to one input of the
comparator, while the other input is externally connected (via
the FB pin) to a feedback network connected to the regulated
output. When the voltage at the FB pin falls below 1.25 V, the
120 kHz oscillator turns on. A driver amplifier provides base
drive to the internal power switch, and the switching action
raises the output voltage. When the voltage at the FB pin ex-
ceeds 1.25 V, the oscillator is shut off. While the oscillator is off,
the ADP1109 quiescent current is only 450 μA. The comparator
includes a small amount of hysteresis, which ensures loop stabil-
ity without requiring external components for frequency com-
pensation.
A shutdown feature permits the oscillator to be shut off. Hold-
ing SHUTDOWN low will disable the oscillator, and the
ADP1109’s quiescent current will remain 450 μA.
The output voltage of the ADP1109 is set with two external
resistors. Three fixed-voltage models are also available: the
ADP1109-3.3 (+3.3 V), ADP1109-5 (+5 V) and ADP1109-12
(+12 V). The fixed-voltage models are identical to the ADP1109,
except that laser-trimmed voltage-setting resistors are included on
the chip. On the fixed-voltage models of the ADP1109, simply
connect the SENSE pin (Pin 8) directly to the output voltage.
COMPONENT SELECTION
General Notes on Inductor Selection
When the ADP1109 internal power switch turns on, current
begins to flow in the inductor. Energy is stored in the inductor
core while the switch is on, and this stored energy is then trans-
ferred to the load when the switch turns off.
To specify an inductor for the ADP1109, the proper values of
inductance, saturation current and dc resistance must be deter-
mined. This process is not difficult, and specific equations are
provided in this data sheet. In general terms, however, the induc-
tance value must be low enough to store the required amount of
energy (when both input voltage and switch ON time are at a
minimum), but high enough that the inductor will not saturate
when both VIN and switch ON time are at their maximum val-
ues. The inductor must also store enough energy to supply the
load, without saturating. Finally, the dc resistance of the induc-
tor should be low, so that excessive power will not be wasted by
heating the windings. For most ADP1109 applications, an in-
ductor of 10 μH to 47 μH, with a saturation current rating of
300 mA to 1A and dc resistance <0.4 Ω is suitable. Ferrite core
inductors that meet these specifications are available in small,
surface-mount packages. Air-core inductors, as well as RF chokes,
are unsuitable because of their low peak current ratings.
The ADP1109 is designed for applications where the input
voltage is fairly stable, such as generating +12 V from a +5 V
logic supply. The ADP1109 does not have an internal switch
current limiting circuit, so the inductor may saturate if the input
voltage is too high. The ADP1111 or ADP3000 should be
considered for battery powered and similar applications where
the input voltage varies.
To minimize Electro-Magnetic Interference (EMI), a toroid or
pot core type inductor is recommended. Rod core inductors are
a lower cost alternative if EMI is not a problem.
Calculating the Inductor Value
Selecting the proper inductor value is a simple, two-step process:Define the operating parameters: minimum input voltage,
maximum input voltage, output voltage and output current.Calculate the inductor value, using the equations in the fol-
lowing section.
Inductor Selection
In a step-up, or boost, converter (Figure 1), the inductor must
store enough power to make up the difference between the input
voltage and the output voltage. The inductor power is calculated
from the equation:(1)
where VD is the diode forward voltage (<0.5 V for a 1N5818
Schottky). Energy is stored in the inductor only while the
ADP1109 switch is ON, so the energy stored in the inductor on
each switching cycle must be must be equal to or greater than:(2)
in order for the ADP1109 to regulate the output voltage. When the
internal power switch turns ON, current flow in the inductor
increases at the rate of:(3)
where L is in Henrys and R' is the sum of the switch equivalent
resistance (typically 0.8 Ω at +25°C) and the dc resistance of
the inductor. In most applications, the voltage drop across the
switch is small compared to VIN so a simpler equation can be
used:(4)
Replacing t in the above equation with the ON time of the
ADP1109 (5.5 μs, typical) will define the peak current for a
given inductor value and input voltage. At this point, the induc-
tor energy can be calculated as follows:(5)
ADP1109
As previously mentioned, EL must be greater than PL/fOSC so
that the ADP1109 can deliver the necessary power to the load.
For best efficiency, peak current should be limited to 1A or
less. Higher switch currents will reduce efficiency because of
increased saturation voltage in the switch. High peak current
also increases output ripple. As a general rule, keep peak current
as low as possible to minimize losses in the switch, inductor and
diode.
In practice, the inductor value is easily selected using the equa-
tions above. For example, consider a supply that will generate
12 V at 120 mA from a +5 V source. The inductor power re-
quired is, from Equation 1:
PL = (12 V + 0.5 V – 5 V) × (120 mA) = 900 mW(6)
On each switching cycle, the inductor must supply:(7)
The required inductor power is fairly low in this example, so
the peak current can also be low. Assuming a peak current of
600mA as a starting point, Equation 4 can be rearranged to
recommend an inductor value:(8)
Substituting a standard inductor value of 33 μH, with 0.2 Ωdc
resistance, will produce a peak switch current of:(9)
Once the peak current is known, the inductor energy can be
calculated from Equation 5:(10)
The inductor energy of 9.7 μJ is greater than the PL/fOSC re-
quirement of 7.5 μJ, so the 33 μH inductor will work in this
application. By substituting other inductor values into the same
equations, the optimum inductor value can be selected. When
selecting an inductor, the peak current must not exceed the
maximum switch current of 1.2 A. If the calculated peak current
is greater than 1.2 A, either the input voltage must be increased
or the load current decreased.
Output Voltage Selection
The output voltage is fed back to the ADP1109 via resistors R1
and R2 (Figure 5). When the voltage at the comparator’s invert-
ing input falls below 1.25 V, the oscillator turns “on” and the
output voltage begins to rise. The output voltage is therefore set
by the formula:(11)
Resistors R1 and R2 are provided internally on fixed-voltage
versions of the ADP1109. In this case, a complete dc-dc con-
verter requires only four external components.
Capacitor Selection
For optimum performance, the ADP1109’s output capacitor
must be carefully selected. Choosing an inappropriate capacitor
can result in low efficiency and/or high output ripple.
Ordinary aluminum electrolytic capacitors are inexpensive, but
often have poor Equivalent Series Resistance (ESR) and Equiva-
lent Series Inductance (ESL). Low ESR aluminum capacitors,
specifically designed for switch mode converter applications, are
also available, and these are a better choice than general purpose
devices. Even better performance can be achieved with tantalum
capacitors, although their cost is higher. Very low values of ESR
can be achieved by using OS-CON capacitors (Sanyo Corpora-
tion, San Diego, CA). These devices are fairly small, available
with tape-and-reel packaging, and have very low ESR.
Diode Selection
In specifying a diode, consideration must be given to speed,
forward voltage drop and reverse leakage current. When the
ADP1109 switch turns off, the diode must turn on rapidly if
high efficiency is to be maintained. Schottky rectifiers, as well as
fast signal diodes such as the 1N4148, are appropriate. The
forward voltage of the diode represents power that is not
delivered to the load, so VF must also be minimized. Again,
Schottky diodes are recommended. Leakage current is especially
important in low current applications, where the leakage can be
a significant percentage of the total quiescent current.
For most circuits, the 1N5818 is a suitable companion to the
ADP1109. This diode has a VF of 0.5 V at 1 A, 4 μA to 10 μA
leakage, and fast turn-on and turn-off times. A surface mount
version, the MBRS130T3, is also available.
For switch currents of 100 mA or less, a Schottky diode such as
the BAT85 provides a VF of 0.8 V at 100 mA and leakage less
than 1 μA. A similar device, the BAT54, is available in an
SOT-23 package. Even lower leakage, in the 1 nA to 5 nA range,
can be obtained with a 1N4148 signal diode.
General purpose rectifiers, such as the 1N4001, are not suitable
for ADP1109 circuits. These devices, which have turn-on times
of 10 μs or more, are far too slow for switching power supply
applications. Using such a diode “just to get started” will result
in wasted time and effort. Even if an ADP1109 circuit appears
to function with a 1N4001, the resulting performance will not
be indicative of the circuit performance when the correct diode
is used.

Partno	Mfg	Dc	Qty	Available	Descript
ADP1109AR	ADI	N/a	10	avai	Micropower Low Cost Fixed 3.3 V, 5 V, 12 V and Adjustable DC-to-DC Converter
ADP1109AR-12 \|ADP1109AR12	ADI	N/a	28	avai	Micropower Low Cost Fixed 3.3 V, 5 V, 12 V and Adjustable DC-to-DC Converter
ADP1109AR-3.3 \|ADP1109AR33	ADI	N/a	25	avai	Micropower Low Cost Fixed 3.3 V, 5 V, 12 V and Adjustable DC-to-DC Converter
ADP1109AR-5 \|ADP1109AR5	ADI	N/a	85	avai	Micropower Low Cost Fixed 3.3 V, 5 V, 12 V and Adjustable DC-to-DC Converter