Ultralow Noise,200 mA,
CMOS Linear Regulator
ADP151
TYPICAL APPLICATION CIRCUIT
FEATURES
Ultralow noise: 9 μV rms
V
= 2.3V
V
= 1.8V
IN
OUT
5
1
2
3
VIN
GND
EN
VOUT
NC
No noise bypass capacitor required
Stable with 1 μF ceramic input and output capacitors
Maximum output current: 200 mA
Input voltage range: 2.2 V to 5.5 V
Low quiescent current
1µF
1µF
ON
4
OFF
NC = NO CONNECT
Figure 1. TSOT ADP151 with Fixed Output Voltage, 1.8 V
IGND = 10 μA with 0 load
1
2
IGND = 265 ꢀA with 200 mA load
Low shutdown current: <1 μA
Low dropout voltage: 140 mV at 200 mA load
Initial accuracy: 1ꢁ
V
= 1.8V
OUT
V
= 2.3V
OUT
IN
VIN
VOUT
A
C
C
IN
1µF
TOP VIEW
(Not to Scale)
ON
Accuracy over line, load, and temperature: 2.5ꢁ
16 fixed output voltage options: 1.1 V to 3.3 V
PSRR performance of 70 dB at 10 kHz
Current limit and thermal overload protection
Logic controlled enable
EN
GND
OFF
B
Figure 2. WLCSP ADP151 with Fixed Output Voltage, 1.8 V
Internal pull-down resistor on EN input
5-lead TSOT package
4-ball, 0.4mm pitch WLCSP
APPLICATIONS
RF, VCO, and PLL power supplies
Mobile phones
Digital camera and audio devices
Portable and battery-powered equipment
Post dc-to-dc regulation
Portable medical devices
GENERAL DESCRIPTION
The ADP151 is an ultralow noise, low dropout, linear regulator
that operates from 2.2 V to 5.5 V and provides up to 200 mA of
output current. The low 140 mV dropout voltage at 200 mA
load improves efficiency and allows operation over a wide input
voltage range.
The ADP151 is specifically designed for stable operation with
tiny 1 ꢀF, 30% ceramic input and output capacitors to meet
the requirements of high performance, space constrained
applications.
The ADP151 is capable of 16 fixed output voltage options,
ranging from 1.1 V to 3.3 V.
Using an innovative circuit topology, the ADP151 achieves
ultralow noise performance without the necessity of a bypass
capacitor, making it ideal for noise-sensitive analog and RF
applications. The ADP151 also achieves ultralow noise per-
formance without compromising PSRR or transient line and
load performance. The low 265 μA of quiescent current at
200 mA load makes the ADP151 suitable for battery-operated
portable equipment.
Short-circuit and thermal overload protection circuits prevent
damage in adverse conditions. The ADP151 is available in tiny
5-lead TSOT and 4-ball, 0.4 mm pitch, halide-free WLCSP
packages for the smallest footprint solution to meet a variety of
portable power application requirements.
The ADP151 also includes an internal pull-down resistor on the
EN input.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2010 Analog Devices, Inc. All rights reserved.
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