ADP3303A Fast Delivery |IC PHOENIX CO.,LIMITED

ADP3303A ,High Accuracy anyCAP?Adjustable 200 mA Low Dropout Linear RegulatorSpecifications subject to change without notice.REV. A–2–ADP3303AABSOLUTE MAXIMUM RATINGS*PIN FUNCT ..
ADP3303AR-2.7 ,High Accuracy anyCAP® 200 mA Low Dropout Linear Regulatorfeatures include shutdown andThe ADP3303 achieves exceptional accuracy of – 0.8% at roomoptional no ..
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ADP3303AR-3.3 ,High Accuracy anyCAP® 200 mA Low Dropout Linear RegulatorSpecifications subject to change without notice.REV. A–2–ADP3303ABSOLUTE MAXIMUM RATINGS*PIN FUNCTI ..
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ADP3303A
High Accuracy anyCAP?Adjustable 200 mA Low Dropout Linear Regulator
REV.A
High Accuracy anyCAP™ Adjustable
200 mA Low Dropout Linear Regulator
FUNCTIONAL BLOCK DIAGRAM
OUTIN
ERR
GND
Figure 1.Typical Application Circuit
FEATURES
High Accuracy Over Line and Load:
60.8% @ +258C, 61.4% Over Temperature
Ultralow Dropout Voltage: 150 mV Typical @ 200 mA
Requires Only CO = 1 mF for Stability
anyCAP = Stable with All Types of Capacitors
(Including MLCC)
Current and Thermal Limiting
Low Noise
Dropout Detector
Low Shutdown Current: 1 mA
3.2 V to 12 V Supply Range
Adjustable 2.2 V to 10 V Output Range
–208C to +858C Ambient Temperature Range
Thermally Enhanced TSSOP-14 Package
APPLICATIONS
Cellular Telephones
Notebook, Palmtop Computers
Battery Powered Systems
Portable Instruments
Post Regulator for Switching Supplies
Bar Code Scanners
GENERAL DESCRIPTION
The ADP3303A is a member of the ADP330x family of preci-
sion low dropout anyCAP voltage regulators. The ADP3303A
stands out from conventional LDOs with a novel architecture,
an enhanced process and a new package. Its patented design
requires only a 1 mF output capacitor for stability. This device is
insensitive to output capacitor ESR (Equivalent Series Resis-
tance), and is stable with any good quality capacitor, including
ceramic types (MLCC) for space restricted applications. The
ADP3303A achieves exceptional accuracy of –0.8% at room
temperature and –1.4% overall accuracy over temperature, line
and load variations. The dropout voltage of the ADP3303A is
only 150 mV (typical) at 200mA.
In addition to the new architecture and process, ADI’s new
proprietary thermally enhanced package (Thermal Coastline)
can handle 1 W of power dissipation without an external heat
sink or large copper surface on the PC board. This keeps PC
board real estate to a minimum and makes the ADP3303A very
attractive for use in portable equipment.
The ADP3303A operates over an input voltage range of 3.2 V
to 12 V and delivers a load current in excess of 200 mA. The
output voltage can be adjusted from 2.2 V to 10 V using an
external resistor divider. It also features an error flag that signals
when the device is about to lose regulation or when the short
circuit or thermal overload protection is activated. Other fea-
tures include shutdown and optional noise reduction capabilities.
anyCAP is a trademark of Analog Devices Inc.
(@ TA = –208C to +858C, VIN = 7 V, CIN = 0.47 mF, COUT = 1 mF, unless otherwise
noted)1ADP3303A–SPECIFICATIONS
LOAD REGULATION
GROUND CURRENT
OUTPUT CURRENT IN
OUTPUT NOISE
NOTESAmbient temperature of +85°C corresponds to a typical junction temperature of +125°C under typical full load test conditions. The formula for Nom VOUT is found
in the Output Voltage Selection section.Accuracy guaranteed using external trim pots.For 2.7 V output, the minimum VIN is 3.2 V.Guaranteed by design and characterization.Ground currents include the current through R1, R2.
Specifications subject to change without notice.
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 ADP3303A 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.
PIN FUNCTION DESCRIPTIONS
PIN CONFIGURATION
NC = NO CONNECT
OUT
OUT
GND
ERRSD
ABSOLUTE MAXIMUM RATINGS*
Input Supply Voltage . . . . . . . . . . . . . . . . . . . –0.3 V to +16 V
Shutdown Input Voltage . . . . . . . . . . . . . . . . –0.3 V to +16 V
Error Flag Output Voltage . . . . . . . . . . . . . . . –0.3 V to +16 V
Noise Bypass Pin Voltage . . . . . . . . . . . . . . . . –0.3 V to +5 V
Power Dissipation . . . . . . . . . . . . . . . . . . . Internally Limited
Operating Ambient Temperature Range . . . –55°C to +125°C
Operation Junction Temperature Range . . .–55°C to +125°CJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96°C/W
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature Range (Soldering 10 sec) . . . . . . . +300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
*This is a stress rating only; operation beyond these limits can cause the device to
be permanently damaged.
Other Members of anyCAP Family1
NOTESSee individual data sheets for detailed ordering information.SO = Small Outline, SOT = Surface Mount Outline.
ORDERING GUIDE
NOTES
All devices operate over the ambient temperature range of –20°C to +85°C.
Contact the factory for the availability of other output voltage options.
ADP3303A
–Typical Performance Characteristics
INPUT VOLTAGE – Volts
OUTPUT VOLTAGE – Volts
3.29875
Figure 2.Line Regulation: Output
Voltage vs. Supply Voltage
OUTPUT LOAD – mA
GROUND CURRENT – 1600
2000
Figure 5.Quiescent Current vs. Load
Current
OUTPUT LOAD – mA20200406080100120140160180
INPUT-OUTPUT VOLTAGE – mV
Figure 8.Dropout Voltage vs. Output
Current
OUTPUT LOAD – mA
OUTPUT VOLTAGE – Volts
3.29900
Figure 3.Output Voltage vs. Load
Current
TEMPERATURE – C
OUTPUT VOLTAGE – %
–0.3
Figure 6.Output Voltage Variation
% vs. Temperature
INPUT VOLTAGE – Volts03043211
INPUT-OUTPUT VOLTAGE – Volts
Figure 9.Power-Up/Power-Down
INPUT VOLTAGE – Volts
GROUND CURRENT –
0.4
Figure 4.Quiescent Current vs.
Supply Voltage
TEMPERATURE – C
GROUND CURRENT –
2500
Figure 7.Quiescent Current vs.
Temperature
TIME – ms0100200
INPUT-OUTPUT VOLTAGE – Volts6080120140160180
Figure 10.Power-Up Transient
TIME – ms
Volts
Figure 11.Line Transient Response
TIME – ms
Volts
3.295
Figure 14.Load Transient for
10 mA to 200 mA Pulse
TIME – ms
Volts
05010203040
Figure 17.Turn Off
TIME – ms
Volts
Figure 12.Line Transient Response
Volts
TIME – sec
200
Figure 15.Short Circuit Current
FREQUENCY – Hz
RIPPLE REJECTION – dB
–10010010M1k10k100k1M
–40
Figure 18.Power Supply Ripple
Rejection
TIME – ms
Volts
3.295
Figure 13.Load Transient for 10 mA
to 200 mA Pulse
TIME – ms
Volts4020080120160
Figure 16.Turn On
FREQUENCY – Hz
VOLTAGE NOISE SPECTRAL DENSITY –
V/ 10
1001k100k10k
0.1
Figure 19.Output Noise Density
ADP3303A
THEORY OF OPERATION
The new anyCAP LDO ADP3303A uses a single control loop
for regulation and reference functions. The output voltage is
sensed by a resistive voltage divider consisting of R1 and R2,
which is varied to provide the available output voltage options.
Feedback is taken from this network by way of a series diode
(D1) and a second resistor divider (R3 and R4) to the input of
an amplifier.
GND
Figure 20.Functional Block Diagram
A very high gain error amplifier is used to control this loop. The
amplifier is constructed in such a way that at equilibrium it
produces a large, temperature proportional input “offset voltage”
that is repeatable and very well controlled. The temperature-
proportional offset voltage is combined with the complementary
diode voltage to form a “virtual bandgap” voltage, implicit in
the network, although it never appears explicitly in the circuit.
Ultimately, this patented design makes it possible to control the
loop with only one amplifier. This technique also improves the
noise characteristics of the amplifier by providing more flexibil-
ity on the trade-off of noise sources that leads to a low noise
design.
The R1, R2 divider is chosen in the same ratio as the bandgap
voltage to the output voltage. Although the R1, R2 resistor
divider is loaded by the diode D1, and a second divider consist-
ing of R3 and R4, the values are chosen to produce a tempera-
ture stable output. This unique arrangement specifically corrects
for the loading of the divider so that the error resulting from
base current loading in conventional circuits is avoided.
The patented amplifier controls a new and unique noninverting
driver that drives the pass transistor, Q1. The use of this special
noninverting driver enables the frequency compensation to
include the load capacitor in a pole splitting arrangement to
achieve reduced sensitivity to the value, type and ESR of the
load capacitance.
Most LDOs place strict requirements on the range of ESR val-
ues for the output capacitor because they are difficult to sta-
bilize due to the uncertainty of load capacitance and resistance.
Moreover, the ESR value, required to keep conventional LDOs
stable, changes depending on load and temperature. These ESR
limitations make designing with LDOs more difficult because
of their unclear specifications and extreme variations over
temperature.
This is no longer true with the ADP3303A anyCAP LDO. It
noise rejection and very high regulator gain, which leads to excel-
lent line and load regulation. An impressive –1.4% accuracy is
guaranteed over line, load and temperature.
Additional features of the circuit include current limit, thermal
shutdown and noise reduction. Compared to standard solutions
that give warning after the output has lost regulation, the
ADP3303A provides improved system performance by enabling
the ERR Pin to give warning before the device loses regulation.
As the chip’s temperature rises above 165°C, the circuit acti-
vates a soft thermal shutdown, indicated by a signal low on the
ERR Pin, to reduce the current to a safe level.
APPLICATION INFORMATION
The ADP3303A is very easy to use. The only external compo-
nent required for stability is a small 1 mF bypass capacitor on the
output. If the shutdown feature is not used, the shutdown pin
(Pin 8) should be tied to the input pin.
CAPACITOR SELECTION
Bypass Capacitor (C1): connecting a 0.47 mF capacitor from the
IN pins (Pins 10 and 11) to ground greatly improves its line
transient response and reduces the circuit’s sensitivity to PC
board layout. A larger capacitor could be used if line transients
of longer duration are expected.
Output Capacitor (C2): as will all members of the anyCAP low
dropout regulator family, the ADP3303A is stable with any type
of output capacitor down to zero ESR. A small 1 mF output
capacitor is required for stability. Larger capacitors with low
ESR are recommended for improved load transient response.
For space limited applications, Multilayer Ceramic Capacitors
(MLCC) are a good choice. For low temperature operations
OS-CON capacitors offer better performance.
Noise Reduction Capacitor (CNR): to reduce the ADP3303A’s
low output noise by 6 dB–10 dB, a noise gain limiting capacitor
can be connected between the feedback (FB) pin (Pin 6) and
the OUT pins as shown in Figure 21. Low leakage capacitors
in the 100 pF–500 pF range provide the best performance.
Larger capacitors will slow down the output transient response.
CNR is not needed in low noise applications where fast load
transients are not expected.
VOUT = +5V
VIN
Figure 21.Noise Reduction Circuit
OUTPUT VOLTAGE SELECTION
The ADP3303A is characterized by having the output voltage
divider placed externally. The output voltage will be divided by
R1 and R2 and fed back to the FB pin.

Partno	Mfg	Dc	Qty	Available	Descript
ADP3303A	AD	N/a	44	avai	High Accuracy anyCAP?Adjustable 200 mA Low Dropout Linear Regulator