ADP3309ART-2.5-REEL7 Datasheet, PDF (1/12 Pages) Analog Devices – anyCAP 100 mA Low Dropout Linear Regulator

FEATURES
±1.2% accuracy over line and load regulations @ 25°C
Ultralow dropout voltage: 120 mV typical @ 100 mA
Requires only COUT = 0.47 μF for stability
anyCAP LDOs are stable with all types of capacitors
(including MLCC)
Current and thermal limiting
Low noise
Low shutdown current: 1 μA
2.8 V to 12 V supply range
−20°C to +85°C ambient temperature range
Several fixed voltage options
Ultrasmall 5-lead SOT-23 package
Excellent line and load regulations
APPLICATIONS
Cellular telephones
Notebook, palmtop computers
Battery-powered systems
PCMCIA regulator
Bar code scanners
Camcorders, cameras
GENERAL DESCRIPTION
The ADP3309 is a member of the ADP330x family of precision
low dropout anyCAP voltage regulators. It is pin-for-pin and
functionally compatible with National’s LP2981, but offers
performance advantages. The ADP3309 stands out from
conventional LDOs with a novel architecture and an enhanced
process. Its patented design requires only a 0.47 μF output
capacitor for stability. This device is stable with any type of
capacitor regardless of its equivalent series resistance (ESR)
value, including ceramic types for space restricted applications.
The ADP3309 achieves ±1.2% accuracy at room temperature
and ±2.2% overall accuracy over temperature, line, and load
regulations. The dropout voltage of the ADP3309 is only
120 mV (typical) at 100 mA. This device also includes a current
limit and a shutdown feature. In shutdown mode, the ground
current is reduced to ~1 μA.
anyCAP^® 100 mA
Low Dropout Linear Regulator
ADP3309
FUNCTIONAL BLOCK DIAGRAM
IN
Q1
ADP3309
OUT
ERR/NC
THERMAL
PROTECTION
CC
R1
Q2
SD
DRIVER
g_m
R2
BANDGAP
REF
GND
Figure 1.
The ADP3309 operates with a wide input voltage range from
2.8 V to 12 V and delivers a load current in excess of 100 mA.
The ADP3309 anyCAP LDO offers a wide range of output
voltages.
ERR/NC 4
ADP3309-3.3
V_IN
C1 ⁺
0.47µF –
1 IN
3
OUT 5
+
2
–
ON
OFF
V_OUT = 3.3V
C2
0.47µF
SD
GND
Figure 2. Typical Application Circuit
Rev. C
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