ADP3605 Analog Devices, ADP3605 Datasheet

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ADP3605

Manufacturer Part Number
ADP3605
Description
120 mA Switched Capacitor Voltage Inverter with Regulated Output
Manufacturer
Analog Devices
Datasheet

Specifications of ADP3605

Input Voltage (v)
3-6v
Vout Preset (v)
-3v/adj
Iout
120mA
Vout #2 (v)
n/a
Iout #2 (µa)
n/a
Vout #3 (v)
n/a
Iout #3 (µa)
n/a
Power Efficiency (%)
n/a
Supply Current
6mA
Shutdown Current, Max
15µA
Package
SOIC-8,TSSOP-14

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a
GENERAL DESCRIPTION
The ADP3605 is a 120 mA regulated output switched capacitor
voltage inverter. It provides a regulated output voltage with
minimum voltage loss and requires a minimum number of ex-
ternal components. In addition, the ADP3605 does not require
the use of an inductor.
Pin-for-pin and functionally compatible with the ADP3604, the
internal oscillator of the ADP3605 runs at 500 kHz nominal
frequency which produces an output switching frequency of
250 kHz. This allows for the use of smaller charge pump and
filter capacitors.
The ADP3605 provides an accuracy of 3% with a typical shut-
down current of 2 A. It can also operate from a single positive
input voltage as low as 3 V. The ADP3605 is offered with the
regulation fixed at –3 V or adjustable via external resistors over
a –3 V to –6 V range.
REV. A
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
Fully Regulated Output Voltage (–3 V and Adjustable)
High Output Current: 120 mA
Output Accuracy:
250 kHz Switching Frequency
Low Shutdown Current: 2 A Typical
Input Voltage Range from 3 V to 6 V
SO-8 and RU-14 Packages
–40 C to +85 C Ambient Temperature Range
APPLICATIONS
Voltage Inverters
Voltage Regulators
Computer Peripherals and Add-On Cards
Portable Instruments
Battery Powered Devices
Pagers and Radio Control Receivers
Disk Drives
Mobile Phones
3%
Voltage Inverter with Regulated Output
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
V
SD
IN
V
120 mA Switched Capacitor
IN
ADP3605
CLOCK
4.7 F
Figure 1. Typical Application Circuit
OFF
*FOR BEST PERFORMANCE, 10 F IS RECOMMENDED
C
C
OSC
GEN
FUNCTIONAL BLOCK DIAGRAM
*C
P
IN
: SPRAGUE, 293D475X0010B2W
, C
IN
+
O
: TOKIN, 1E475ZY5UC205F
S D
ON
0
P
4.7 F
World Wide Web Site: http://www.analog.com
S1
*C
SD
P
C
S
+
P
+
N
D
S2
ADP3605-3
V
C
C
IN
P
P
+
C
GND
P
V
OUT
S4
© Analog Devices, Inc., 1999
D
FEEDBACK
CONTROL
N
ADP3605
LOOP
S
D
GND
N
V
B
SENSE
S
S3
+
*C
4.7 F
O
–3.0V
V
V
OUT
SENSE

Related parts for ADP3605

ADP3605 Summary of contents

Page 1

... The ADP3605 provides an accuracy of 3% with a typical shut- down current can also operate from a single positive input voltage as low The ADP3605 is offered with the regulation fixed at – adjustable via external resistors over a – –6 V range. ...

Page 2

... C/W JA Operating Temperature Range . . . . . . . . . . . – +85 C Model Output Voltage ADP3605AR-3 –3 V ADP3605AR ADJ ADP3605ARU-3 –3 V *Contact the factory for the availability of other output voltage options 5 Symbol Conditions ...

Page 3

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADP3605 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges larger than 600 V HBM. ...

Page 4

... ADP3605 –Typical Performance Characteristics 270 260 250 3 3.5 4 4.5 5 5.5 SUPPLY VOLTAGE – Volts Figure 2. Oscillator Frequency vs. Supply Voltage 300 280 260 240 220 200 –40 – TEMPERATURE – C Figure 5. Oscillator Frequency vs. Temperature 3.5 NORMAL MODE ( 2.5 2 1.5 SHUTDOWN MODE ( 0 ...

Page 5

... A small 1 F input bypass capacitor, preferably with low ESR, such as tantalum or multilayer ceramic, is recommended to reduce noise and supply transients and supply part of the peak input current drawn by the ADP3605. A large capacitor is rec- ommended if the input supply is connected to the ADP3605 through long leads the pulse current drawn by the device might affect other circuitry through supply coupling ...

Page 6

... This is far below the 660 mW power dissipation capability of the ADP3605 in SO-8 or 600 mW in RU-14 General Board Layout Guidelines Since the ADP3605’s internal switches turn on and off very fast, ADP3605-3 good PC board layout practices are critical to ensure optimal operation of the device. Improper layouts will result in poor load regulation, especially under heavy loads ...

Page 7

... LOAD CURRENT – mA Figure 15. Maximum Unregulated Output Voltage Regulated Adjustable Output Voltage For the adjustable version of the ADP3605, the regulated out- put voltage is programmed by a resistor which is inserted be- tween the V and V pins, as illustrated in Figure 16. SENSE OUT The inherent limit of the output voltage of a single inverting charge pump stage is – ...

Page 8

... ADP3605 8-Lead Small Outline IC (SO-8) 0.1968 (5.00) 0.1890 (4.80 0.1574 (4.00) 0.2440 (6.20 0.1497 (3.80) 0.2284 (5.80) PIN 1 0.0688 (1.75) 0.0098 (0.25) 0.0532 (1.35) 0.0040 (0.10) 0.0500 0.0192 (0.49) SEATING 0.0098 (0.25) (1.27) 0.0138 (0.35) PLANE BSC 0.0075 (0.19) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 14-Lead Thin Shrink Small Outline Package (TSSOP) 0.177 (4.50) 0.169 (4.30) 0.0196 (0.50) x 45° ...

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