ADP3000AN AD [Analog Devices], ADP3000AN Datasheet

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ADP3000AN

Manufacturer Part Number
ADP3000AN
Description
Micropower Step-Up/Step-Down Fixed 3.3 V, 5 V, 12 V and Adjustable High Frequency Switching Regulator
Manufacturer
AD [Analog Devices]
Datasheet
a
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
GENERAL DESCRIPTION
The ADP3000 is a versatile step-up/step-down switching
regulator that operates from an input supply voltage of 2 V to
12 V in step-up mode and up to 30 V in step-down mode.
The ADP3000 operates in Pulse Frequency Mode (PFM) and
consumes only 500 A, making it highly suitable for applica-
tions that require low quiescent current.
The ADP3000 can deliver an output current of 100 mA at
3 V from a 5 V input in step-down configuration and 180 mA at
3.3 V from a 2 V input in step-up configuration.
The auxiliary gain amplifier can be used as a low battery detector,
linear regulator undervoltage lockout or error amplifier.
The ADP3000 operates at 400 kHz switching frequency. This
allows the use of small external components (inductors and
capacitors), making the device very suitable for space constrained
designs.
FEATURES
Operates at Supply Voltages from 2 V to 30 V
Works in Step-Up or Step-Down Mode
Very Few External Components Required
High Frequency Operation Up to 400 kHz
Low Battery Detector on Chip
User Adjustable Current Limit
Fixed and Adjustable Output Voltage
8-Pin DIP and SO-8 Package
Small Inductors and Capacitors
APPLICATIONS
Notebook, Palmtop Computers
Cellular Telephones
Hard Disk Drives
Portable Instruments
Pagers
High Frequency Switching Regulator
Fixed 3.3 V, 5 V, 12 V and Adjustable
Micropower Step-Up/Step-Down
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
5V–6V
2V–3.2V
V
IN
V
IN
V
IN
100µF
REFERENCE
C1, C2: AVX TPS D107 M010R0100
L1: SUMIDA CD43-100
10V
Figure 2. Step-Down Mode Operation
100µF
C1
1.245V
FUNCTIONAL BLOCK DIAGRAM
GND
10V
Figure 1. Typical Application
R1
120
R
LIM
SET
World Wide Web Site: http://www.analog.com
I
LIM
1
ADP3000-3.3V
ADP3000
GND
GND
COMPARATOR
I
LIM
1
5
5
R2
V
120
A1
2
IN
SENSE
GAIN BLOCK/
ERROR AMP
(SENSE)
SW2
SW1
SW2
3
FB
V
1N5818
2
SW1
4
IN
FB
OSCILLATOR
6.8µH
8
4
D1
400kHz
3
8
C1, C2: AVX TPS D107 M010R0100
L1: SUMIDA CD43-6R8
ADP3000
© Analog Devices, Inc., 1997
10µH
100µF
IN5817
L1
10V
ADP3000
CL
+
DRIVER
+
C1
100µF
10V
R2
150k
1%
R1
110k
1%
3.3V @
180mA
A0
I
SW1
SW2
LIM
V
3V
100mA
OUT

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ADP3000AN Summary of contents

Page 1

FEATURES Operates at Supply Voltages from Works in Step-Up or Step-Down Mode Very Few External Components Required High Frequency Operation Up to 400 kHz Low Battery Detector on Chip User Adjustable Current Limit Fixed ...

Page 2

ADP3000–SPECIFICATIONS Parameter INPUT VOLTAGE SHUTDOWN QUIESCENT CURRENT COMPARATOR TRIP POINT VOLTAGE OUTPUT SENSE VOLTAGE COMPARATOR HYSTERESIS OUTPUT HYSTERESIS OSCILLATOR FREQUENCY DUTY CYCLE SWITCH ON TIME SWITCH SATURATION VOLTAGE STEP-UP MODE STEP-DOWN MODE FEEDBACK PIN BIAS CURRENT SET PIN BIAS CURRENT ...

Page 3

... IN TOP VIEW SW1 3 (Not to Scale) SW2 4 * FIXED VERSIONS Model ADP3000AN-3.3 ADP3000AR-3.3 ADP3000AN-5 ADP3000AR-5 ADP3000AN-12 ADP3000AR-12 ADP3000AN ADP3000AR N = plastic DIP small outline package LIM SW1 1.245V REFERENCE DRIVER SW2 GND Figure 3b. Functional Block Diagram for Fixed Version –3– ...

Page 4

ADP3000 –Typical Characteristics 2.5 2 + 0.1 ...

Page 5

TEMPERATURE – Figure 11. Duty Cycle vs. Temperature 250 200 150 100 50 0 – TEMPERATURE ...

Page 6

ADP3000 THEORY OF OPERATION The ADP3000 is a versatile, high frequency, switch mode power supply (SMPS) controller. The regulated output voltage can be greater than the input voltage (boost or step-up mode) or less than the input (buck or step-down ...

Page 7

Table II. Recommended Capacitors Vendor Series Type AVX TPS Surface Mount Sanyo OS-CON Through-Hole Sprague 595D Surface Mount Panasonic HFQ Through-Hole DIODE SELECTION The ADP3000’s high switching speed demands the use of Schottky diodes. Suitable choices include the 1N5817, 1N5818, ...

Page 8

ADP3000 The circuit of Figure 18 may produce multiple pulses when approaching the trip point due to noise coupled into the SET input. To prevent multiple interrupts to the digital logic, hysteresis can be added to the circuit (Figure 18). ...

Page 9

Typical Application Circuits L1 6.8µ 3. 120 100µF 10V LIM IN 3 SW1 ADP3000-3.3V SENSE SW2 GND SUMIDA CD43-6R8 C1 AVX TPS D107 M010R100 TYPICAL ...

Page 10

ADP3000 L1 = SUMIDA CD53-150 C1 = AVX TPS D476 M016R0150 C2 = AVX TPS D107 M010R0100 TYPICAL EFFICIENCY = 60% 2.5V 4.2V 100k 120 + 100µF 10V – AVX-TPS 1M 90k Figure 27. 1 Cell LI-ION to 3 V/200 ...

Page 11

Plastic DIP (N-8) 0.430 (10.92) 0.348 (8.84 0.280 (7.11) 0.240 (6.10 0.060 (1.52) PIN 1 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) 0.160 (4.06) MIN 0.115 (2.93) SEATING 0.100 0.022 (0.558) 0.070 (1.77) PLANE (2.54) ...

Page 12

–12– ...

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