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PDF ADP2300 Data sheet ( Hoja de datos )
| Número de pieza | ADP2300 | |
| Descripción | (ADP2300 / ADP2301) Nonsynchronous Step-Down Regulator | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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1.2 A, 20 V, 700 kHz/1.4 MHz,
Nonsynchronous Step-Down Regulator
ADP2300/ADP2301
FEATURES
1.2 A maximum load current
±2% output accuracy over temperature range
Wide input voltage range: 3.0 V to 20 V
700 kHz (ADP2300) or 1.4 MHz (ADP2301)
switching frequency options
High efficiency up to 91%
Current-mode control architecture
Output voltage from 0.8 V to 0.85 × VIN
Automatic PFM/PWM mode switching
Precision enable pin with hysteresis
Integrated high-side MOSFET
Integrated bootstrap diode
Internal compensation and soft start
Minimum external components
Undervoltage lockout (UVLO)
Overcurrent protection (OCP) and thermal shutdown (TSD)
ADIsimPower™ online design tool
Available in ultrasmall, 6-lead TSOT package
APPLICATIONS
LDO replacement for digital load applications
Intermediate power rail conversion
Communications and networking
Industrial and instrumentation
Healthcare and medical
Consumer
GENERAL DESCRIPTION
The ADP2300/ADP2301 are compact, constant-frequency,
current-mode, step-down dc-to-dc regulators with integrated
power MOSFET. The ADP2300/ADP2301 devices run from
input voltages of 3.0 V to 20 V, making them suitable for a wide
range of applications. A precise, low voltage internal reference
makes these devices ideal for generating a regulated output
voltage as low as 0.8 V, with ±2% accuracy, for up to 1.2 A load
current.
There are two frequency options: the ADP2300 runs at 700 kHz,
and the ADP2301 runs at 1.4 MHz. These options allow users to
make decisions based on the trade-off between efficiency and
TYPICAL APPLICATIONS CIRCUIT
3.0V TO 20V
VIN
BST
ADP2300/ SW
ADP2301
VOUT
ON
OFF
EN
GND
FB
100
95
90
85
80
75
70
65
60
0
Figure 1.
fSW = 1.4MHz
fSW = 700kHz
VVIONU=T
12V
= 5.0V
0.2 0.4 0.6 0.8 1.0 1.2
IOUT (A)
Figure 2. Efficiency vs. Output Current
total solution size. Current-mode control provides fast and stable
line and load transient performance. The ADP2300/ADP2301
devices include internal soft start to prevent inrush current at
power-up. Other key safety features include short-circuit protec-
tion, thermal shutdown (TSD), and input undervoltage lockout
(UVLO). The precision enable pin threshold voltage allows the
ADP2300/ADP2301 to be easily sequenced from other input/
output supplies. It can also be used as a programmable UVLO
input by using a resistive divider.
The ADP2300/ADP2301 are available in a 6-lead TSOT package
and are rated for the −40°C to +125°C junction temperature range.
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2010 Analog Devices, Inc. All rights reserved.
Free Datasheet http://www.Datasheet4U.com
1 page  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADP2300/ADP2301
BST 1 ADP2300/ 6 SW
GND 2 ADP2301 5 VIN
TOP VIEW
(Not to Scale)
FB 3
4 EN
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. Mnemonic
Description
1 BST
Boost Supply for the High-Side MOSFET Driver. A 0.1 μF capacitor is connected between the SW and BST pins
to form a floating supply to drive the gate of the MOSFET switch above the VIN supply voltage.
2 GND
Ground. Connect this pin to the ground plane.
3 FB
Feedback Voltage Sense Input. Connect this pin to a resistive divider from VOUT. Set the voltage to 0.8 V for a
desired VOUT.
4 EN
Output Enable. Pull this pin high to enable the output. Pull this pin low to disable the output. This pin can
also be used as a programmable UVLO input. This pin has a 1.2 μA pull-down current to GND.
5 VIN
Power Input. Connect to the input power source with a ceramic bypass capacitor to GND directly from this pin.
6 SW
Switch Node Output. Connect an inductor to VOUT and a catch diode to GND from this pin.
Rev. 0 | Page 5 of 28
Free Datasheet http://www.Datasheet4U.com
5 Page 
VOUT
1
VIN
SW
32
CH1 5mV BW CH2 10V
CH3 5V
BW M1ms
A CH3 11.4V
Figure 34. ADP2301 Line Transient,
7 V to 15 V, VOUT = 3.3 V, IOUT = 1.2 A, fSW = 1.4 MHz
VOUT
1
IL
SW
4
2
CH1 1V BW
CH2 10V BW M10µs
CH4 1A Ω BW
A CH1 2.56V
Figure 35. ADP2301 Short-Circuit Entry, VOUT = 3.3 V
(fSW = 1.4 MHz)
1
VOUT
IL
4 SW
2
CH1 1V BW
CH2 10V BW
CH4 1A Ω BW
M100µs A CH1 1.2V
Figure 36. ADP2301 Short-Circuit Recovery, VOUT = 3.3 V
(fSW = 1.4 MHz)
ADP2300/ADP2301
100 200
80 160
60 120
40 80
20 40
00
–20 –40
–40 –80
–60 –120
–80 CROSS FREQUENCY: 127kHz
PHASE MARGIN: 53°
–100
1k
1
10k 100k
FREQUENCY (Hz)
2
1M
–160
–200
Figure 37. ADP2301 Bode Plot, VOUT = 5.0 V, VIN = 12 V
(fSW = 1.4 MHz, L = 4.7 μH, COUT = 10 μF)
100 200
80 160
60 120
40 80
20 40
00
–20 –40
–40 –80
–60 –120
–80 CROSS FREQUENCY: 80kHz
PHASE MARGIN: 68°
–100
1k 10k
1
100k
FREQUENCY (Hz)
2
1M
–160
–200
Figure 38. ADP2301 Bode Plot, VOUT = 3.3 V, VIN = 12 V
(fSW = 1.4 MHz, L = 4.7 μH, COUT = 22 μF)
100 200
80 160
60 120
40 80
20 40
00
–20 –40
–40 –80
–60 –120
–80 CROSS FREQUENCY: 27kHz
PHASE MARGIN: 76°
–100
1k
1
10k
100k
FREQUENCY (Hz)
2
1M
–160
–200
Figure 39. ADP2300 Bode Plot, VOUT = 5.0 V, VIN = 12 V
(fSW = 700 kHz, L = 10 μH, COUT = 22 μF)
Rev. 0 | Page 11 of 28
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet ADP2300.PDF ] | |
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