High Accuracy Ultralow IQ,
200 mA, SOT-23, anyCAP™
Low Dropout Regulator
ADP3330
a
FEATURES
High Accuracy Over Line and Load: 60.7% @ +258C,
61.4% Over Temperature
Ultralow Dropout Voltage: 140 mV (Typ) @ 200 mA
Requires Only CO = 0.47 mF for Stability
anyCAP = Stable with Any Type of Capacitor
(Including MLCC)
Current and Thermal Limiting
Low Noise
Low Shutdown Current: 230°C/W for a standard SOT-23
leadframe. Figure 22 shows the difference between the standard
SOT-23 and the Chip-on-Lead leadframes.
TA MAX = 125°C – 42.4°C = 82.6°C
–8–
REV. A
ADP3330
Printed Circuit Board Layout Considerations
Low Power, Low Dropout Applications
All surface mount packages rely on the traces of the PC board
to conduct heat away from the package.
ADP3330 is well suited for applications such as cellular phone
handsets that require low quiescent current and low dropout
voltage features. ADP3330 draws 34 µA typical under light load
situations (i.e., load current = 100 µA), which results in low
power consumption when the cell phone is in standby mode.
In standard packages the dominant component of the heat
resistance path is the plastic between the die attach pad and the
individual leads. In typical thermally enhanced packages one or
more of the leads are fused to the die attach pad, significantly
decreasing this component. To make the improvement meaningful, however, a significant copper area on the PCB must be
attached to these fused pins.
Figure 23 shows an application in which the ADP3330 is used
in a handset to provide 2.75 V nominal output voltage. The cell
phone is powered from 3 cell NiCd or 1 cell Li-Ion battery.
ADP3330 guarantees an accuracy of 1.4%, even when the input/
output differential is merely 250 mV (worst case). This implies
that the output is regulated and within specification even when
the battery voltage has reached its end-of-discharge voltage of
3 V. The output voltage never falls below 2.7 V, even under
worst case load and temperature conditions. The low dropout
feature coupled with the high accuracy of the ADP3330 ensures
that the system is reliably powered until the end of the life of the
battery, which results in increased system talk time.
The patented chip-on-lead frame design of the ADP3330
uniformly minimizes the value of the dominant portion of the
thermal resistance. It ensures that heat is conducted away by all
pins of the package. This yields a very low 165°C/W thermal
resistance for an SOT-23-6 package, without any special board
layout requirements, just relying on the normal traces connected to the leads. This yields a 17% improvement in heat
dissipation capability as compared to a standard SOT-23-6
package. The thermal resistance can be decreased by, approximately, an additional 10% by attaching a few square cm of
copper area to the VIN pin of the ADP3303 package.
MINIMUM BATTERY
VOLTAGE 3.0V
It is not recommended to use solder mask or silkscreen on the
PCB traces adjacent to the ADP3330’s pins since it will increase
the junction to ambient thermal resistance of the package.
250mV MAXIMUM INPUT-OUTPUT
OVERHEAD FOR 200mA OUTPUT
CURRENT
Error Flag Dropout Detector
NOMINAL OUTPUT
VOLTAGE 2.75V
The ADP3330 will maintain its output voltage over a wide
range of load, input voltage and temperature conditions. If the
output is about to lose regulation by reducing the supply voltage
below the combined regulated output and dropout voltages,
the ERR flag will be activated. The ERR output is an open
collector, which will be driven low.
–1.4% OUTPUT
VOLTAGE ACCURACY
2.712V
ABSOLUTE MINIMUM
OUTPUT VOLTAGE
2.700V
Once set, the ERR flag’s hysteresis will keep the output low
until a small margin of operating range is restored either by
raising the supply voltage or reducing the load.
12mV TRANSIENT, LINE AND
LOAD RESPECTIVE MARGIN
Figure 23.␣ LDO Budgeting for a 3 Cell NiCd/1 Cell
Li-Ion Supply
Shutdown Mode
Applying a TTL high signal to the shutdown (SD) pin, or tying
it to the input pin, will turn the output ON. Pulling SD down to
0.4 V or below, or tying it to ground, will turn the output OFF.
In shutdown mode, quiescent current is reduced to much less
than 1 µA.
REV. A
END OF DISCHARGE VOLTAGE
OF 3 CELL NiCd OR 1 CELL
Li-Ion BATTERY
–9–
ADP3330
APPLICATION CIRCUITS
Crossover Switch
Higher Output Current
The circuit in Figure 24 shows how two ADP3330s can be used to
form a mixed supply voltage system. The output switches between
two different levels selected by an external digital input. Output
voltages can be any combination of voltages from the Ordering
Guide of the data sheet.
The ADP3330 can source up to 200 mA at room temperature
without any heatsink or pass transistor. If higher current is
needed, an appropriate pass transistor can be used, as in Figure
25, to increase the output current to 1 A.
C1
100mF
VIN = 3.85V TO 12V
IN
VOUT = 3.6V/2.5V
OUT
MJE253*
VIN = 4.5V TO 8V
IN
ADP3330-3.6
OUTPUT SELECT
3V
0V
VOUT = 3V@1A
R1
50V
OUT
+
SD
ADP3330-3
GND
SD
C2
100mF
ERR
GND
C1+
1.0mF
OUT
IN
ADP3330-2.5
+
C2
0.47mF
*AAVID531002 HEAT SINK IS USED
Figure 25.␣ High Output Current Linear Regulator
LOGIC SUPPLY
SD
GND
Figure 24.␣ Crossover Switch
–10–
REV. A
ADP3330
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
C3455a–0–8/99
6-Lead Surface Mount
RT-6 (SOT-23-6)
0.122 (3.10)
0.106 (2.70)
0.071 (1.80)
0.059 (1.50)
6
5
4
1
2
3
0.118 (3.00)
0.098 (2.50)
PIN 1
0.037 (0.95) BSC
0.075 (1.90)
BSC
0.051 (1.30)
0.035 (0.90)
0.020 (0.50) SEATING
0.010 (0.25) PLANE
10°
0.009 (0.23) 0°
0.003 (0.08)
0.022 (0.55)
0.014 (0.35)
PRINTED IN U.S.A.
0.059 (0.15)
0.000 (0.00)
0.057 (1.45)
0.035 (0.90)
REV. A
–11–
–12–
PRINTED IN U.S.A.
C3455a–0–8/99
Package/Price Information
High Accuracy Ultralow I(Q), 200 mA, SOT-23, anyCAP® Low Dropout Regulator
Status
Package
Description
Pin
Count
Temperature
Range
Price*
(100-499)
ADP3330ART-2.5-RL
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
ADP3330ART-2.5-RL7
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
ADP3330ART-2.75-R7
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
ADP3330ART-2.75-RL
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
ADP3330ART-2.85-R7
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
ADP3330ART-2.85-RL
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
ADP3330ART-3-REEL
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
ADP3330ART-3-REEL7
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
ADP3330ART-3.3-RL
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
ADP3330ART-3.3-RL7
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
ADP3330ART-3.6-RL
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
ADP3330ART-3.6-RL7
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
ADP3330ART-5-REEL
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
ADP3330ART-5-REEL7
PRODUCTION
SOT-23, SOT-143 or SOT-223
6
INDUSTRIAL
-
Model
* This price is provided for budgetary purposes as recommended list price in U.S. Dollars per unit in the stated volume. Pricing displayed for Evaluation
Boards and Kits is based on 1-piece pricing. View Pricing and Availability for further information.