Datasheet

ManualsBrandsANALOG DEVICES ManualsPMICsPMIC - DC/DC voltage regulator Holder SOIC 8 EP

2 A/3 A, 20 V, 700 kHz,

Nonsynchronous Step-Down Regulators

Data Sheet

ADP2302/ADP2303

Rev. A

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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

Supported by ADIsimPower™ design tool

APPLICATIONS

Intermediate power rail conversion

DC-to-DC point of load applications

Communications and networking

Industrial and instrumentation

Healthcare and medical

Consumer

TYPICAL APPLICATIONS CIRCUIT

VIN

OUT

ADP2302/

ADP2303

PGOOD

GND

OFF

BST

08833-001

Figure 1. Typical Application Circuit

100

0 0.5 1.0 1.5 2.0 2.5 3.0

EFFICIENCY (%)

OUTPUT CURRENT (A)

INDUCTOR: VLF10040T

4R7N5R4

DIODE: SSB43L

OUT

= 3.3V

OUT

= 5.0V

08833-002

Figure 2. ADP2303 Efficiency vs. Output Current at V

= 12 V

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.

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 −40

to +125

C junction temperature range.

Summary of content (28 pages)

PAGE 1
FEATURES APPLICATIONS Intermediate power rail conversion DC-to-DC point of load applications Communications and networking Industrial and instrumentation Healthcare and medical Consumer TYPICAL APPLICATIONS CIRCUIT VIN VIN BST ADP2302/ ADP2303 PGOOD SW EN FB VOUT 08833-001 ON OFF GND Figure 1. Typical Application Circuit 100 90 EFFICIENCY (%) Wide input voltage range: 3.0 V to 20 V Maximum load current 2 A for ADP2302 3 A for ADP2303 ±1.
PAGE 2
ADP2302/ADP2303 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Overvoltage Protection (OVP) ................................................. 15 Applications ....................................................................................... 1 Power Good ................................................................................ 15 Typical Applications Circuit...............................................
PAGE 3
Data Sheet ADP2302/ADP2303 SPECIFICATIONS VIN = 3.3 V, TJ = −40°C to +125°C for minimum/maximum specifications, and TA = 25°C for typical specifications, unless otherwise noted. Table 1.
PAGE 4
ADP2302/ADP2303 Data Sheet ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 2. Parameter VIN, EN, PGOOD SW BST to SW FB, NC Operating Junction Temperature Range Storage Temperature Range Soldering Conditions θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. MAX Rating −0.3 V to +24 V −1.0 V to +24 V −0.6 V to +6 V −0.3 V to +6 V −40°C to +125°C −65°C to +150°C JEDEC J-STD-020 Table 3.
PAGE 5
Data Sheet ADP2302/ADP2303 BST 1 VIN 2 EN 3 ADP2302 ADP2303 TOP VIEW PGOOD 4 (Not to Scale) 8 SW 7 GND 6 NC 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. 08833-003 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Figure 3. Pin Configuration (Top View) Table 4. Pin Function Descriptions Pin No.
PAGE 6
ADP2302/ADP2303 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 90 80 80 70 VOUT = 2.5V VOUT = 3.3V VOUT = 5.0V 60 50 0.5 1.0 1.5 60 50 INDUCTOR: VLF10040T-6R8N4R5 DIODE: SSB43L 0 VOUT = 1.5V VOUT = 1.8V VOUT = 2.5V VOUT = 3.3V VOUT = 5.0V 2.0 2.5 3.0 OUTPUT CURRENT (A) 40 INDUCTOR: VLF10040T-4R7N5R4 DIODE: SSB43L 0 90 80 80 EFFICIENCY (%) 90 70 VOUT = 1.2V VOUT = 1.5V VOUT = 1.8V VOUT = 2.5V 60 40 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT CURRENT (A) 0 1.0 1.5 2.0 Figure 8.
PAGE 7
ADP2302/ADP2303 0.20 0.20 0.15 0.15 0.10 0.10 LOAD REGULATION (%) 0.05 0 –0.05 –0.10 –0.15 –0.05 –0.10 11 14 17 20 –0.20 VIN (V) 0 Figure 10. ADP2302 Line Regulation, VOUT = 3.3 V, IOUT = 2 A 1.0 OUTPUT CURRENT (A) 1.5 2.0 Figure 13. ADP2302 Load Regulation, VOUT = 3.3V, VIN = 12 V 0.20 0.15 0.15 0.10 0.10 LOAD REGULATION (%) 0.20 0.05 0 –0.05 –0.10 –0.15 0.05 0 –0.05 –0.10 8 11 14 17 08833-011 5 20 VIN (V) –0.20 0 0.5 1.0 1.5 2.0 2.5 3.
PAGE 8
Data Sheet 810 812 790 810 770 808 750 806 FEEDBACK VOLTAGE (mV) 730 710 690 670 650 630 802 800 798 796 794 792 610 0 20 40 60 80 100 120 TEMPERATURE (°C) 788 –40 4.4 6.4 4.2 6.2 4.0 6.0 PEAK CURRENT LIMIT (A) PEAK CURRENT LIMIT (A) 20 40 60 80 100 120 120 Figure 19. 0.8 V Feedback Voltage vs. Temperature 3.8 3.6 3.4 3.2 3.0 2.8 5.8 5.6 5.4 5.2 5.0 4.8 0 20 40 60 80 100 120 4.
PAGE 9
Data Sheet ADP2302/ADP2303 270 150 265 145 260 140 MINIMUM ON TIME (ns) MINIMUM OFF TIME (ns) 255 250 245 240 235 230 225 220 135 130 125 120 115 110 215 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 100 –40 08833-022 205 –40 –20 0 20 40 60 80 100 08833-025 105 210 120 TEMPERATURE (°C) Figure 22. Minimum Off Time vs. Temperature Figure 25. Minimum On Time vs.
PAGE 10
ADP2302/ADP2303 Data Sheet VOUT VOUT 1 1 IL IL 4 4 EN EN SW 2 2 CH1 2.00V BW CH3 10.0V BW CH2 10.0V M1.00ms CH4 2.00A Ω T 20.20% A CH3 6.20V 08833-028 3 CH1 2.00V BW CH3 10.0V BW Figure 28. Soft Start Without Load, VOUT = 3.3 V, VIN = 12 V CH2 10.0V M1.00ms CH4 2.00A Ω T 20.20% A CH3 3.60V 08833-031 SW 3 Figure 31. Soft Start with Full Load, VOUT = 3.3 V, VIN = 12 V VOUT (AC) VOUT (AC) 1 1 IO IO 4 B W CH4 2.00A Ω M200µs T 20.00% A CH4 1.20A CH1 200mV B W CH4 2.
PAGE 11
Data Sheet ADP2302/ADP2303 VOUT VOUT 1 1 IL IL SW 4 4 SW B W CH2 10.0V M40.0µs CH4 5.00A Ω T 30.00% A CH1 1.26V CH1 1.00V B W CH2 10.0V M400µs CH4 5.00A Ω T 30.00% A CH1 1.26V 08833-037 2 CH1 1.00mV 08833-034 2 Figure 37. Output Short Recovery, VOUT = 3.3 V, VIN = 12 V, L = 4.7 μH, COUT = 2 × 47 μF Figure 34. Output Short, VOUT = 3.3 V, VIN = 12 V, L = 4.7 μH, COUT = 2 × 47 μF VOUT VOUT 1 VIN VIN 1 SW 2 M1.00ms A CH3 T 23.40% 11.0V CH1 20.0mV BW CH2 10.0V BW M1.00ms CH3 5.
PAGE 12
180 80 180 64 144 64 144 48 108 48 108 32 72 32 72 16 36 16 36 0 0 0 0 –16 –36 –32 –72 –48 –108 –144 –64 –180 –80 1k 10k 100k FREQUENCY (Hz) 1M –32 –72 –48 –108 1k Figure 40. ADP2302 Bode Plot, VOUT = 5 V, VIN = 12 V, L = 6.8 μH, COUT = 2 × 22 μF 10k 100k FREQUENCY (Hz) 1M –180 Figure 42. ADP2303 Bode Plot, VOUT = 2.5 V, VIN = 12 V, L = 3.
PAGE 13
Data Sheet ADP2302/ADP2303 FUNCTIONAL BLOCK DIAGRAM VIN VIN 2 THERMAL SHUTDOWN SHUTDOWN LOGIC UVLO SHUTDOWN IC 1.20V OFF CURRENT SENSE AMPLIFIER OCP EN 3 1.2µA OVP 0.880V BOOT REGULATOR CURRENT LIMIT THRESHOLD R 1 BST Q S VBIAS = 1.1V PGOOD 4 0.680V 8 RAMP GENERATOR SW VOUT CLK GENERATOR FREQUENCY FOLDBACK (⅛ fSW, ¼ fSW, ½ fSW, fSW) NC 6 gm 5 0.8V VOLTAGE REFERENCE FB ADP2302/ADP2303 7 GND Figure 44. Functional Block Diagram Rev.
PAGE 14
ADP2302/ADP2303 Data Sheet THEORY OF OPERATION The ADP2302/ADP2303 are nonsynchronous, step-down, dc-to-dc regulators, each with an integrated high-side power MOSFET. The high switching frequency and 8-lead SOIC package provide a small, step-down, dc-to-dc regulator solution. The ADP2302/ADP2303 can operate with an input voltage from 3.0 V to 20 V while regulating an output voltage down to 0.8 V.
PAGE 15
Data Sheet ADP2302/ADP2303 Table 5. Correlation Between fSW and VFB OVERVOLTAGE PROTECTION (OVP) FB Pin Voltage VFB ≥ 0.6 V 0.4 V < VFB < 0.6 V 0.2 V < VFB ≤ 0.4 V VFB ≤ 0.2 V The ADP2302/ADP2303 provide an overvoltage protection feature to protect the system against an output short to a higher voltage supply. If the feedback voltage is above 0.880 V, the internal high-side MOSFET is turned off, until the voltage at FB decreases to 0.850 V. At that time, the ADP2302/ADP2303 resume normal operation.
PAGE 16
ADP2302/ADP2303 Data Sheet APPLICATIONS INFORMATION ADIsimPower DESIGN TOOL The ADP2302/ADP2303 are supported by the ADIsimPower design tool set. ADIsimPower is a collection of tools that produce complete power designs optimized for a specific design goal. The tools enable the user to generate a full schematic and bill of materials, and calculate performance in minutes.
PAGE 17
Data Sheet ADP2302/ADP2303 22 VIN VIN 20 MAXIMUM INPUT VOLTAGE 18 ADP2302/ ADP2303 REN1 16 EN 12 REN2 10 08833-047 VIN (V) 14 8 Figure 49. Precision Enable Used as a Programmable UVLO 6 0 2 4 6 8 VOUT (V) 10 12 14 16 08833-147 2 The precision enable feature also allows the ADP2302/ADP2303 to be sequenced precisely by using a resistive voltage divider from another dc-to-dc power supply, as shown in Figure 50. MINIMUM INPUT VOLTAGE 4 Figure 47.
PAGE 18
ADP2302/ADP2303 Data Sheet response and efficiency. Therefore, the inductor value is calculated using the following equation: L VIN  VOUT  0.3  I LOAD (max)  f sw V  VD   OUT  V IN  VD     CATCH DIODE The catch diode conducts the inductor current during the off time of the internal MOSFET. The average current of the diode in normal operation is, therefore, dependent on the duty cycle of the regulator as well as the output load current. where ILOAD(max) is the maximum load current.
PAGE 19
Data Sheet ADP2302/ADP2303 INPUT CAPACITOR The input capacitor must be able to support the maximum input operating voltage and the maximum RMS input current. The rms ripple current flowing through the input capacitor is, at maximum, ILOAD(max)/2.
PAGE 20
ADP2302/ADP2303 Data Sheet DESIGN EXAMPLE This section provides the procedures to select the external components, based on the example specifications listed in Table 10. The schematic for this design example is shown in Figure 51. Because the output current is 3 A, the ADP2303 is chosen for this application. Table 10. Step-Down DC-to-DC Regulator Requirements Parameter Input Voltage, VIN Output Voltage, VOUT Programmable UVLO Voltage PGOOD Specification 12.0 V ± 10% 3.
PAGE 21
Data Sheet ADP2302/ADP2303 CIN 10µF 25V VIN REN1 56kΩ 1% REN2 10.2kΩ 1% BST CBST 0.1µF ADP2303 RPGOOD 100kΩ SW PGOOD EN L D 4.7µH SSB43L VOUT = 3.3V 3A COUT1 47µF 6.3V COUT2 47µF 6.3V RTOP 31.6kΩ 1% FB RBOT 10.2kΩ 1% GND 08833-049 VIN = 12V Figure 51. Schematic for the Design Example Table 11. Recommended External Components for Typical Applications at 2 A/3 A Output Load Part Number ADP2302 ADP2303 VIN (V) 18 18 12 12 12 12 12 5 5 5 18 18 12 12 12 12 12 5 5 5 VOUT (V) 3.3 5.0 1.5 1.
PAGE 22
ADP2302/ADP2303 Data Sheet CIRCUIT BOARD LAYOUT RECOMMENDATIONS  Good circuit board layout is essential to obtaining the best performance for ADP2302/ADP2303. Poor layout can affect the regulation and stability, as well as the electromagnetic interface (EMI) and electromagnetic compatibility (EMC) performance. A PCB layout example is shown in Figure 53.
PAGE 23
Data Sheet ADP2302/ADP2303 TYPICAL APPLICATION CIRCUITS BST VIN CIN 10µF 25V ADP2302ARDZ EN SW RPGOOD 100kΩ PGOOD CBST 0.1µF VOUT = 1.5V 2A L 4.7µH D B330B COUT1 47µF 6.3V COUT2 47µF 6.3V RTOP 10kΩ 1% FB RBOT 11.3kΩ 1% GND 08833-052 VIN = 12V Figure 54. ADP2302 Typical Application, VIN = 12 V, VOUT = 1.5 V, 2 A VIN CIN 10µF 25V BST ADP2302ARDZ EN CBST 0.1µF SW RPGOOD 100kΩ PGOOD VOUT = 1.8V 2A L 4.7µH D B330B COUT1 22µF 6.3V COUT2 22µF 6.3V COUT3 22µF 6.3V RTOP 12.
PAGE 24
ADP2302/ADP2303 Data Sheet VIN = 12V BST VIN CIN 10µF 25V ADP2302ARDZ-5.0 EN SW RPGOOD 100kΩ PGOOD CBST 0.1µF VOUT = 5.0V 2A L 6.8µH D B330B COUT1 22µF 16V COUT2 22µF 16V 08833-056 FB GND Figure 58. ADP2302 Typical Application, VIN = 12 V, VOUT = 5 V, 2 A VIN CIN 10µF 25V BST ADP2303ARDZ EN CBST 0.1µF SW RPGOOD 100kΩ PGOOD VOUT = 1.5V 3A L 2.5µH D SSB43L COUT1 47µF 6.3V COUT2 47µF 6.3V COUT3 47µF 6.3V RTOP 10kΩ 1% FB RBOT 11.3kΩ 1% GND 08833-057 VIN = 12V Figure 59.
PAGE 25
Data Sheet ADP2302/ADP2303 VIN = 12V BST VIN CIN 10µF 25V ADP2303ARDZ-5.0 EN CBST 0.1µF SW RPGOOD 100kΩ PGOOD VOUT = 5V 3A L 4.7µH D SSB43L COUT1 47µF 6.3V 08833-060 FB GND Figure 62. ADP2303 Typical Application, VIN = 12 V, VOUT = 5 V, 3 A BST VIN CIN 10µF 25V ADP2302ARDZ EN SW RPGOOD 100kΩ PGOOD CBST 0.1µF L 3.3µH D B330B VOUT = 1.2V 2A COUT1 47µF 6.3V COUT2 47µF 6.3V RTOP 10kΩ 1% FB RBOT 20kΩ 1% GND Figure 63. ADP2302 Typical Application, VIN = 5V, VOUT = 1.2 V, 2 A Rev.
PAGE 26
ADP2302/ADP2303 Data Sheet OUTLINE DIMENSIONS 5.00 4.90 4.80 2.29 0.356 4 1 6.20 6.00 5.80 4.00 3.90 3.80 2.29 0.457 FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. BOTTOM VIEW 1.27 BSC 3.81 REF TOP VIEW 1.65 1.25 1.75 1.35 SEATING PLANE 0.51 0.31 0.50 0.25 0.10 MAX 0.05 NOM COPLANARITY 0.10 8° 0° 45° 0.25 0.17 1.04 REF 1.27 0.40 COMPLIANT TO JEDEC STANDARDS MS-012-A A 06-02-2011-B 5 8 Figure 64.
PAGE 27
Data Sheet ADP2302/ADP2303 NOTES Rev.