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PDF ADP2303 Data sheet ( Hoja de datos )
| Número de pieza | ADP2303 | |
| Descripción | (ADP2302 / ADP2303) Nonsynchronous Step-Down Regulators | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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2 A/3 A, 20 V, 700 kHz,
Nonsynchronous Step-Down Regulators
ADP2302/ADP2303
FEATURES
Wide input voltage range: 3.0 V to 20 V
Maximum load current
2 A for ADP2302
3 A for ADP2303
±1.5% output accuracy over temperature
Output voltage down to 0.8 V
700 kHz switching frequency
Current-mode control architecture
Automatic PFM/PWM mode
Precision enable pin with hysteresis
Integrated high-side MOSFET
Integrated bootstrap diode
Internal compensation and soft start
Power-good output
Undervoltage lockout (UVLO)
Overcurrent protection (OCP)
Thermal shutdown (TSD)
8-lead SOIC package with exposed paddle
APPLICATIONS
Intermediate power rail conversion
DC-to-DC point of load applications
Communications and networking
Industrial and instrumentation
Healthcare and medical
Consumer
GENERAL DESCRIPTION
The ADP2302/ADP2303 are fixed frequency, current-mode
control, step-down, dc-to-dc regulators with an integrated
power MOSFET. The ADP2302/ADP2303 can run from an
input voltage of 3.0 V to 20 V, which makes them suitable for a
wide range of applications. The output voltage of the ADP2302/
ADP2303 can be down to 0.8 V for the adjustable version, while
the fixed output version is available in preset output voltage
options of 5.0 V, 3.3 V, and 2.5 V. The 700 kHz operating
frequency allows small inductor and ceramic capacitors to be
used, providing a compact solution. Current mode control
provides fast and stable line and load transient performance.
TYPICAL APPLICATIONS CIRCUIT
VIN
VIN BST
ADP2302/
ADP2303
PGOOD
SW
VOUT
ON
OFF
EN
GND
FB
Figure 1. Typical Application Circuit
100
90
80
70
60
50
INDUCTOR: VLF10040T-4R7N5R4
DIODE: SSB43L
40
0
0.5 1.0 1.5
2.0
OUTPUT CURRENT (A)
VOUT = 3.3V
VOUT = 5.0V
2.5 3.0
Figure 2. ADP2303 Efficiency vs. Output Current at VIN = 12 V
The ADP2302/ADP2303 have integrated soft start circuitry to
prevent a large inrush current at power-up. The power-good
signal can be used to sequence devices that have an enable input.
The precision enable threshold voltage allows the part to be
easily sequenced from other input/output supplies. Other key
features include undervoltage lockout (UVLO), overvoltage
protection (OVP), thermal shutdown (TSD), and overcurrent
protection (OCP).
The ADP2302/ADP2303 devices are available in the 8-lead,
SOIC package with exposed paddle and are rated for the −40oC
to +125oC 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
BST 1 ADP2302 8 SW
VIN 2 ADP2303 7 GND
EN 3 TOP VIEW 6 NC
PGOOD 4 (Not to Scale) 5 FB
NOTES
1. NC = NO CONNECT.
2. THE EXPOSED PAD SHOULD BE SOLDERED
TO AN EXTERNAL GROUND PLANE UNDERNEATH
THE IC FOR THERMAL DISSIPATION.
Figure 3. Pin Configuration (Top View)
ADP2302/ADP2303
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1 BST
Bootstrap Supply for the High-Side MOSFET Driver. A 0.1 μF capacitor is connected between SW and BST to
provide a floating driver voltage for the power switch.
2 VIN
Power Input. Connect to the input power source with a ceramic bypass capacitor to GND directly from this
pin.
3 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 an internal 1.2 μA pull-down current to GND.
4
PGOOD
Power-Good Open-Drain Output.
5 FB
Feedback Voltage Sense Input. For the adjustable version, connect this pin to a resistive divider from VOUT. For
the fixed output version, connect this pin to VOUT directly.
6 NC
Used for internal testing. Connect to GND or leave this pin floating to ensure proper operation.
7 GND
Ground. Connect this pin to the ground plane.
8 SW
Switch Node Output. Connect an inductor to VOUT and a catch diode to GND from this pin.
9 (EPAD) Exposed Pad The exposed pad should be soldered to an external ground plane underneath the IC for thermal dissipation.
Rev. 0 | Page 5 of 28
Free Datasheet http://www.Datasheet4U.com
5 Page 
ADP2302/ADP2303
VOUT
1
IL
4 SW
2
CH1 1.00mV BW CH2 10.0V M40.0µs A CH1 1.26V
CH4 5.00A Ω T 30.00%
Figure 34. Output Short, VOUT = 3.3 V, VIN = 12 V,
L = 4.7 μH, COUT = 2 × 47 μF
VOUT
VIN
1
SW
3
2
CH1 20.0mV BW CH2 10.0V BW M1.00ms A CH3 11.0V
CH3 5.00V BW
T 23.40%
Figure 35. ADP2303 Line Transient, 7 V to 15 V, VOUT = 3.3 V, IOUT = 3 A,
L = 4.7 μH, COUT = 2 × 47 μF
80 180
64 144
48 108
32 72
16 36
00
–16
–32
–48
–64 CROSS FREQUENCY = 36kHz
PHASE MARGIN = 60°
–80
1k
10k 100k
FREQUENCY (Hz)
–36
–72
–108
–144
–180
1M
Figure 36. ADP2302 Bode Plot, VOUT = 2.5 V, VIN = 12 V,
L = 4.7 μH, COUT =3 × 22 μF
VOUT
1
IL
4
SW
2
CH1 1.00V BW CH2 10.0V M400µs
A CH1 1.26V
CH4 5.00A Ω T 30.00%
Figure 37. Output Short Recovery, VOUT = 3.3 V, VIN = 12 V,
L = 4.7 μH, COUT = 2 × 47 μF
VOUT
1
VIN
SW
3
2
CH1 20.0mV BW CH2 10.0V BW M1.00ms A CH3
CH3 5.00V BW
T 23.40%
11.0V
Figure 38. ADP2302 Line Transient, 7 V to 15 V, VOUT = 3.3 V, IOUT = 2 A,
L = 6.8 μH, COUT = 2 × 22 μF
80 180
64 144
48 108
32 72
16 36
00
–16 –36
–32
–48
–64 CROSS FREQUENCY = 42kHz
PHASE MARGIN = 56°
–80
1k
10k 100k
FREQUENCY (Hz)
–72
–108
–144
–180
1M
Figure 39. ADP2302 Bode Plot, VOUT = 3.3 V, VIN = 12 V,
L = 6.8 μH, COUT = 2 × 22 μF
Rev. 0 | Page 11 of 28
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet ADP2303.PDF ] | |
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