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ADP3000 데이터시트 PDF




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부품번호 ADP3000 기능
기능 Micropower Step-Up/Step-Down Fixed 3.3 V/ 5 V/ 12 V and Adjustable High Frequency Switching Regulator
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ADP3000 데이터시트, 핀배열, 회로
a
Micropower Step-Up/Step-Down
Fixed 3.3 V, 5 V, 12 V and Adjustable
High Frequency Switching Regulator
ADP3000
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
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 µA, 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.
FUNCTIONAL BLOCK DIAGRAM
SET
A1
VIN
GAIN BLOCK/
ERROR AMP
1.245V
REFERENCE
400kHz
OSCILLATOR
COMPARATOR
DRIVER
R1 R2
ADP3000
GND
SENSE
A0
ILIM
SW1
SW2
VIN
2V–3.2V
100µF
10V
120
6.8µH IN5817
3.3V @
180mA
12
ILIM
VIN
SW1 3
ADP3000-3.3V
FB
(SENSE)
8
GND SW2
54
+ C1
100µF
10V
C1, C2: AVX TPS D107 M010R0100
L1: SUMIDA CD43-6R8
Figure 1. Typical Application
VIN
5V–6V
C1
100µF
10V
RLIM
120
1 23
ILIM VIN SW1
FB 8
ADP3000
GND
5
SW2 4
D1
1N5818
C1, C2: AVX TPS D107 M010R0100
L1: SUMIDA CD43-100
L1
10µH
CL +
100µF
10V
R2
150k
1%
VOUT
3V
100mA
R1
110k
1%
Figure 2. Step-Down Mode Operation
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997




ADP3000 pdf, 반도체, 판매, 대치품
ADP3000–Typical Characteristics
2.5
2.0
1.5
VIN = 5V @ TA = +25°C
1.0
0.5 VIN = 3V @ TA = +25°C
VIN = 2V @ TA = +25°C
0
0.1 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.5
SWITCH CURRENT – A
Figure 4. Switch ON Voltage vs.
Switch Current in Step-Up Mode
1.4
1.2 VIN = 5V @ TA = +25°C
1.0
0.8 VIN = 12V @ TA = +25°C
0.6
0.4
0.2
0.0
0.1 0.2 0.3 0.4 0.5 0.6 0.8 0.9
SWITCH CURRENT – A
Figure 5. Saturation Voltage vs.
Switch Current in Step-Down Mode
1400
1200
1000
QUIESCENT CURRENT @ TA = +25°C
800
600
400
200
0
1.5 3
6 9 12 15 18 21 24 27 30
INPUT VOLTAGE – V
Figure 6. Quiescent Current vs.
Input Voltage
406
OSCILLATOR FREQUENCY –
405 @ TA = +25°C
404
403
402
401
400
399
396
24 6
8 10 12 15 18 21 24 27 30
INPUT VOLTAGE – V
Figure 7. Oscillator Frequency vs.
Input Voltage
0.8
VIN = 5V
0.7
TA = 0°C
0.6 TA = +25°C
0.5 TA = +85°C
0.4
0.3
0.2
0.1
0
1
10 100
RLIM
1k
Figure 8a. Maximum Switch Current
vs. RLIM in Step-Down Mode (5 V)
1.8
VIN = 12V
1.6
1.4
TA = +25°C
TA = 0°C
1.2
1.0 TA = +85°C
0.8
0.6
0.4
0.2
0
1 10 100 1k
RLIM
Figure 8b. Maximum Switch Current
vs. RLIM in Step-Down Mode (12 V)
1.8
VIN = 3V
1.6
1.4
1.2 TA = +25°C
1.0
TA = 0°C
0.8 TA = +85°C
0.6
0.4
0.2
0
1 10 100 1k
RLIM
Figure 8c. Maximum Switch Current
vs. RLIM in Step-Up Mode (3 V)
440
430
420
410
400
390
380
370
360
350
340
330
–40
0 25 70
TEMPERATURE – °C (TA)
85
Figure 9. Oscillator Frequency vs.
Temperature
2.30
2.25
2.20
2.15
2.10
2.05
2.00
1.95
1.90
1.85
1.80
–40
0 25 70
TEMPERATURE – °C (TA)
85
Figure 10. Switch ON Time vs.
Temperature
–4– REV. 0

4페이지










ADP3000 전자부품, 판매, 대치품
ADP3000
Table II. Recommended Capacitors
Vendor Series
Type
Phone Numbers
AVX
Sanyo
Sprague
Panasonic
TPS
OS-CON
595D
HFQ
Surface Mount
Through-Hole
Surface Mount
Through-Hole
(803) 448-9411
(619) 661-6835
(603) 224-1961
(201) 348-5200
DIODE SELECTION
The ADP3000’s high switching speed demands the use of
Schottky diodes. Suitable choices include the 1N5817, 1N5818,
1N5819, MBRS120LT3 and MBR0520LT1. Do not use fast
recovery diodes because their high forward drop lowers effi-
ciency. Neither general-purpose diodes nor small signal diodes
should be used.
PROGRAMMING THE SWITCHING CURRENT LIMIT
OF THE POWER SWITCH
The ADP3000’s RLIM pin permits the cycle by cycle switch
current limit to be programmed with a single external resistor.
This feature offers major advantages which ultimately decrease
the component cost and P.C.B. real estate. First, it allows the
ADP3000 to use low value, low saturation current and physi-
cally small inductors. Additionally, it allows the ADP3000 to
use a physically small surface mount tantalum capacitor with a
typical ESR of 0.1 to achieve an output ripple as low as 40
mV to 80 mV, as well as low input ripple.
As a rule of thumb, the current limit is usually set to approximately
3 to 5 times the full load current for boost applications and
about 1.5–3 times of the full load current in buck applications.
The internal structure of the ILIM circuit is shown in Figure 17.
Q1 is the ADP3000’s internal power switch, which is paralleled
by sense transistor Q2. The relative sizes of Q1 and Q2 are
scaled so that IQ2 is 0.5% of IQ1. Current flows to Q2 through
both an internal 80 resistor and the RLIM resistor. The voltage
on these two resistors biases the base-emitter junction of the
oscillator-disable transistor, Q3. When the voltage across R1
and RLIM exceeds 0.6 V, Q3 turns on and terminates the output
pulse. If only the 80 internal resistor is used (i.e. the ILIM pin
is connected directly to VIN), the maximum switch current will
be 1.5 A. Figure 8a gives values for lower current-limit values.
RLIM
(EXTERNAL)
VIN
VIN ILIM
R1 80
(INTERNAL)
Q3
ADP3000
IQ1 SW1
DRIVER 200
Q1
400kHz
Q2 POWER
OSC
SWITCH
SW2
The delay through the current limiting circuit is approximately
0.3 µs. If the switch ON time is reduced to less than 1.7 µs,
accuracy of the current trip-point is reduced. Attempting to
program a switch ON time of 0.3 µs or less will produce
spurious responses in the switch ON time. However, the
ADP3000 will still provide a properly regulated output voltage.
PROGRAMMING THE GAIN BLOCK
The gain block of the ADP3000 can be used as a low battery
detector, error amplifier or linear post regulator. The gain block
consists of an op amp with PNP inputs and an open-collector
NPN output. The inverting input is internally connected to the
ADP3000’s 1.245 V reference, while the noninverting input is
available at the SET pin. The NPN output transistor will sink in
excess of 300 µA.
Figure 18 shows the gain block configured as a low battery
monitor. Resistors R1 and R2 should be set to high values to
reduce quiescent current, but not so high that bias current in
the SET input causes large errors. A value of 33 kfor R2 is a
good compromise. The value for R1 is then calculated from the
formula:
R1
=
V
LOBATT
1.245
1.245
V
V
R2
where VLOBATT is the desired low battery trip point. Since the
gain block output is an open-collector NPN, a pull-up resistor
should be connected to the positive logic power supply.
5V
VBATT
R1
R2
33k
ADP3000
1.245V
REF
VIN
AO
RL
47k
SET
GND
TO
PROCESSOR
1.6M
RHYS
R1 =
VLB – 1.245V
37.7µA
VLB = BATTERY TRIP POINT
Figure 18. Setting the Low Battery Detector Trip Point
Figure 17. ADP3000 Current Limit Operation
REV. 0
–7–

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