ADP1111AR Analog Devices, ADP1111AR Datasheet

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ADP1111AR

Manufacturer Part Number
ADP1111AR
Description
36V; 500mW; micropower, step-up/step-down SW regulator. For 3V to 5V, 5V to 12V step-up converters, 9-5V, 12-5V step-down converters, lap-top and palmtop computers
Manufacturer
Analog Devices
Datasheet
a
GENERAL DESCRIPTION
The ADP1111 is part of a family of step-up/step-down switch-
ing regulators that operates from an input voltage supply of 2 V
to 12 V in step-up mode and up to 30 V in step-down mode.
The ADP1111 can be programmed to operate in step-up/step-
down or inverting applications with only 3 external components.
The fixed outputs are 3.3 V, 5 V and 12 V; and an adjustable
version is also available. The ADP1111 can deliver 100 mA at
5 V from a 3 V input in step-up mode, or it can deliver 200 mA
at 5 V from a 12 V input in step-down mode.
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.
FEATURES
Operates from 2 V to 30 V Input Voltage Range
72 kHz Frequency Operation
Utilizes Surface Mount Inductors
Very Few External Components Required
Operates in Step-Up/Step-Down or Inverting Mode
Low Battery Detector
User Adjustable Current Limit
Internal 1 A Power Switch
Fixed or Adjustable Output Voltage
8-Pin DIP or SO-8 Package
APPLICATIONS
3 V to 5 V, 5 V to 12 V Step-Up Converters
9 V to 5 V, 12 V to 5 V Step-Down Converters
Laptop and Palmtop Computers
Cellular Telephones
Flash Memory VPP Generators
Remote Controls
Peripherals and Add-On Cards
Battery Backup Supplies
Uninterruptible Supplies
Portable Instruments
Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V
Micropower, Step-Up/Step-Down SW
Maximum switch current can be programmed with a single
resistor, and an open collector gain block can be arranged in
multiple configuration for low battery detection, as a post linear
regulator, undervoltage lockout, or as an error amplifier.
If input voltages are lower than 2 V, see the ADP1110.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
V
V
IN
IN
REFERENCE
REFERENCE
GND
GND
1.25V
1.25V
FUNCTIONAL BLOCK DIAGRAMS
R1
SET
SET
FB
World Wide Web Site: http://www.analog.com
R2 220k
COMPARATOR
COMPARATOR
A1
A1
A2
A2
SENSE
GAIN BLOCK/
ERROR AMP
GAIN BLOCK/
ERROR AMP
OSCILLATOR
OSCILLATOR
© Analog Devices, Inc., 1996
ADP1111
ADP1111-5
ADP1111-12
ADP1111
DRIVER
DRIVER
SW2
A0
I
SW1
A0
I
SW1
SW2
LIM
LIM

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ADP1111AR Summary of contents

Page 1

... V from input in step-up mode can deliver 200 from input in step-down mode. 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 ...

Page 2

ADP1111–SPECIFICATIONS Parameter QUIESCENT CURRENT INPUT VOLTAGE COMPARATOR TRIP POINT VOLTAGE OUTPUT SENSE VOLTAGE COMPARATOR HYSTERESIS OUTPUT HYSTERESIS OSCILLATOR FREQUENCY DUTY CYCLE SWITCH ON TIME SW SATURATION VOLTAGE STEP-UP MODE STEP-DOWN MODE FEEDBACK PIN BIAS CURRENT SET PIN BIAS CURRENT GAIN ...

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... ADP1111AN ADP1111AR ADP1111AN- ADP1111AR- Plastic DIP Small Outline Package. CAUTION 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 ADP1111 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges ...

Page 4

ADP1111–Typical Characteristics 1.4 1.2 1 0.4 0.2 0 0.1 0.2 0.4 0.6 I CURRENT – A SWITCH Figure 2. Saturation Voltage vs. I Step-Up Mode 2.0 1.8 1.6 1.4 1.2 ...

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ON TIME 7.1 7.0 6.9 6.8 6.7 6.6 – TEMPERATURE – C Figure 8. Switch ON Time vs. Temperature 58 56 DUTY CYCLE – TEMPERATURE – C ...

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ADP1111 350 300 BIAS CURRENT 250 200 150 100 50 0 – TEMPERATURE – C Figure 14. Set Pin Bias Current vs. Temperature THEORY OF OPERATION The ADP1111 is a flexible, low-power, switch-mode power supply (SMPS) controller. The ...

Page 7

INDUCTOR SELECTION–STEP-UP CONVERTER In a step-up or boost converter (Figure 18), the inductor must store enough power to make up the difference between the input voltage and the output voltage. The power that must be stored is calculated from the ...

Page 8

ADP1111 As previously mentioned, the switch voltage is higher in step- down mode than in step-up mode current and is therefore a function For most applications value of 1 recommended. SW ...

Page 9

Figure 15. Aluminum Electrolytic Figure 16. Tantalum Electrolytic Figure 17. OS-CON Capacitor If low output ripple is important, the user should consider the ADP3000. Because this device switches at 400 kHz, lower peak current can be used. Also, the higher ...

Page 10

ADP1111 CIRCUIT OPERATION, STEP DOWN (BUCK) MODE) The ADP1111’s step down mode is used to produce an output voltage that is lower than the input voltage. For example, the output of four NiCd cells (+4.8 V) can be converted to ...

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Input Output Output Voltage Voltage Current ( 6.5 ...

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ADP1111 This occurs in the step-up mode when the following condition is met OUT DIODE where DC is the ADP1111’s duty cycle. When this relationship exists, the inductor current does not go ...

Page 13

The circuit of Figure 27b 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 27). Resistor ...

Page 14

ADP1111 Voltage-Controlled Positive-to-Negative Converter By including an op amp in the feedback path, a simple positive- to-negative converter can be made to give an output that is a linear multiple of a controlling voltage, Vc. The op amp, an OP196, ...

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REV. 0 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead Plastic DIP (N-8) 0.430 (10.92) 0.348 (8.84 0.280 (7.11) 0.240 (6.10 0.325 (8.25) 0.300 (7.62) 0.060 (1.52) PIN 1 0.015 (0.38) 0.210 (5.33) MAX 0.130 ...

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