ADP2302

Part: ADP2302/ADP2303 — Analog Devices

Type: Nonsynchronous Step-Down Regulator

Description: The ADP2302/ADP2303 are 2 A/3 A, 3.0 V to 20 V input, 700 kHz nonsynchronous step-down regulators with integrated power MOSFET and current-mode control.

Operating Conditions:

• Supply voltage: 3.0 V to 20 V
• Operating junction temperature: -40°C to +125°C
• Output voltage: down to 0.8 V (adjustable version)

Absolute Maximum Ratings:

• Max supply voltage (VIN, EN, PGOOD): +24 V
• Max SW voltage: +24 V
• Max junction temperature: +125°C
• Max storage temperature: +150°C

Key Specs:

• Input voltage range: 3 V to 20 V
• Output accuracy: ±1.5% over temperature
• Switching frequency: 700 kHz (typ)
• ADP2302 peak current limit: 3.5 A (typ, V BST -V SW = 5V)
• ADP2303 peak current limit: 5.5 A (typ, V BST -V SW = 5V)
• Feedback regulation voltage (adjustable): 0.8 V (typ)
• High-side MOSFET On Resistance: 120 mΩ (typ, V BST -V SW = 5 V, I SW = 200mA)
• Shutdown current: 24 μA (typ, V EN = 0 V, V IN = 12V)
• Thermal shutdown threshold: 150 °C (typ, rising temperature)

Features:

• 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)

Applications:

• Intermediate power rail conversion
• DC-to-DC point of load applications
• Communications and networking
• Industrial and instrumentation
• Healthcare and medical
• Consumer

Package:

• 8-lead SOIC package with exposed paddle

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

Intermediate power rail conversion DC-to-DC point of load applications Communications and networking Industrial and instrumentation Healthcare and medical

Consumer

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)

Table 4. Pin Function Descriptions

08833-003

Table 2.

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Absolute maximum ratings apply individually only, not in combination. Unless otherwise specified, all voltages are referenced to GND.

θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages.

Table 3. Thermal Resistance 1

1 JA is measured using natural convection on JEDEC 4-layer board.

Figure 54. ADP2302 Typical Application, VIN = 12 V, VOUT = 1.5 V, 2 A

Figure 55. ADP2302 Typical Application, VIN = 12 V, VOUT = 1.8 V, 2 A

Figure 56. ADP2302 Typical Application, VIN = 12 V, VOUT = 2.5 V, 2 A

Figure 57. ADP2302 Typical Application, VIN = 12 V, VOUT = 3.3 V, 2 A, with Programmable 7.8 V UVLO

Figure 58. ADP2302 Typical Application, VIN = 12 V, VOUT = 5 V, 2 A

Figure 59. ADP2303 Typical Application, VIN = 12 V, VOUT = 1.5 V, 3 A

Figure 60. ADP2303 Typical Application, VIN = 12 V, VOUT = 1.8 V, 3 A

Figure 61. ADP2303 Typical Application, VIN = 12 V, VOUT = 2.5 V, 3 A

Figure 62. ADP2303 Typical Application, VIN = 12 V, VOUT = 5 V, 3 A

Figure 63. ADP2302 Typical Application, VIN = 5V, VOUT = 1.2 V, 2 A