ADP3000 View Datasheet(PDF) - Analog Devices
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ADP3000 Datasheet PDF : 16 Pages
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Micropower Step-Up/Step-Down Fixed 3.3 V, 5 V, 12 V,
Adjustable High Frequency Switching Regulator
ADP3000
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
Operates at supply voltages from 2 V to 30 V
SET
Works in step-up or step-down mode
Very few external components required
A1
A0
VIN
High frequency operation up to 400 kHz
GAIN BLOCK/
ILIM
Low battery detector on-chip
User-adjustable current limit
Fixed and adjustable output voltage
8-lead PDIP, 8-lead SOIC, and 14-lead TSSOP packages
Small inductors and capacitors
E APPLICATIONS
Notebook, palmtop computers
Cellular telephones
T Hard disk drives
Portable instruments
Pagers
E GENERAL DESCRIPTION
The ADP3000 is a versatile step-up/step-down switching
L regulator. It operates from an input supply voltage of 2 V to
12 V in step-up mode, and from 2 V to 30 V in step-down mode.
Operating in pulse frequency mode (PFM), the device consumes
O only 500 µA, making it ideal for applications requiring low
quiescent current. It delivers an output current of 180 mA at
3.3 V from a 2 V input in step-up mode, and an output current
of 100 mA at 3 V from a 5 V input in step-down mode.
S The ADP3000 operates at 400 kHz switching frequency. This
allows the use of small external components (inductors and
capacitors), making it convenient for space-constrained designs.
B The auxiliary gain amplifier can be used as a low battery detector,
O linear regulator, undervoltage lockout, or error amplifier.
1.245V
REFERENCE
R1
GND
ERROR AMP
400kHz
OSCILLATOR
COMPARATOR
DRIVER
SW1
SW2
R2
SENSE
Figure 1.
ADP3000
VIN
2V TO 3.2V
100µF
10V
6.8µH IN5817
120V
1
2
ILIM
VIN
SW1 3
ADP3000-3.3V
FB
(SENSE)
8
GND
5
SW2
4
3.3V
180mA
+
C1
100µF
10V
C1, C2 = AVX TPS D107 M010R0100
L1 = SUMIDA CR43-6R8
Figure 2. Typical Application
VIN
5V TO 6V
C1
100µF
10V
RLIM
120Ω
1
ILIM
2
3
VIN SW1
FB 8
ADP3000
SW2 4
GND
5
D1
L1
10µH
CL
100µF
+
R2
150kΩ
1%
R1
VOUT
3V
100mA
1N5818
10V
110kΩ
1%
C1, C2 = AVX TPS D107 M010R0100
L1 = SUMIDA CR43-100
Figure 3. Step-Down Mode Operation
Rev. A
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However, no responsibility is assumed by Analog Devices for its use, nor for any
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Specifications subject to change without notice. No license is granted by implication
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Tel: 781.329.4700
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Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
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