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Analog Devices Inc. ADP7157ARDZ-02-R7
- Part No.:
- ADP7157ARDZ-02-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
ADP7157ARDZ-02-R7.pdf
- Description:
- IC REG LINEAR POS ADJ 1.2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:805
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Product details
Overview
ADP7157ARDZ-02-R7 from Analog Devices is an adjustable ultralow-noise, high-PSRR linear regulator optimized for RF-sensitive loads. It operates from 2.3 V to 5.5 V input, delivers up to 1.2 A output current, and supports 2.3 V output voltage with ±1.5% accuracy over line/load/temperature. Its 0.9 µV rms (100 Hz–100 kHz) noise and 82 dB PSRR at 1 kHz–100 kHz make it suitable for powering VCOs and PLLs in microwave backhaul systems.
For engineers reviewing the ADP7157ARDZ-02-R7 datasheet, ADP7157ARDZ-02-R7 pinout, ADP7157ARDZ-02-R7 application, or ADP7157ARDZ-02-R7 equivalent, key selection criteria include output noise spectral density (1.7 nV/√Hz), dropout voltage (120 mV @ 1.2 A), precision enable threshold (1.13–1.31 V logic high), thermal performance (θJA = 53.8°C/W in LFCSP), and compatibility with 10 µF ceramic output capacitors.
Technical Context
The ADP7157ARDZ-02-R7 uses a P-channel MOSFET pass element with unity-gain error amplifier architecture, enabling output noise independent of output voltage setting. Its internal reference is heavily filtered to achieve 1.7 nV/√Hz noise spectral density from 10 kHz to 1 MHz.
This variant (−02) is specifically characterized for VIN = 2.8 V and VOUT = 2.3 V, delivering 72 dB PSRR from 1 kHz to 100 kHz and 53 dB at 1 MHz. It integrates programmable precision enable, undervoltage lockout (UVLO rise threshold 2.22 V), and thermal shutdown at 150°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Adjustable 1.2 V to 3.3 V; ADP7157ARDZ-02-R7 is factory-configured for 2.3 V nominal output via external resistor divider. |
| Noise (100 Hz–100 kHz) | 0.9 µV rms - enables clean biasing of phase-locked loops without spurious sideband degradation. |
| PSRR (1 kHz–100 kHz) | 72 dB - suppresses switching noise from upstream DC/DC converters feeding RF signal chains. |
| Dropout Voltage | 120 mV typical @ 1.2 A, 2.3 V - allows operation with minimal headroom in battery-powered 2.5 V rail systems. |
| Load Regulation | 0.3 %/A - ensures stable output under dynamic RF PA load transients without droop-induced frequency drift. |
| Enable Threshold | Logic high: 1.13–1.31 V; enables direct interfacing with 1.8 V GPIO without level-shifting circuitry. |
| Thermal Resistance θJA | 53.8°C/W (10-lead LFCSP) - requires ≥4-layer PCB with exposed pad soldered to ground plane for full 1.2 A capability. |
Pinout & Package
ADP7157ARDZ-02-R7 is packaged in a 10-lead, 3 mm × 3 mm LFCSP with exposed thermal pad electrically connected to GND. The package provides low thermal resistance (θJA = 53.8°C/W) and supports high-current operation in compact RF modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 10) | Input supply connection | Accepts 2.3–5.5 V; requires ≥10 µF ceramic capacitor to ground for stability and transient response. |
| VOUT (Pins 1, 2) | Regulated output | Delivers up to 1.2 A; bypassed with 10 µF ceramic capacitor; dual pins reduce IR drop and improve current sharing. |
| VOUT_SENSE (Pin 3) | Remote output sensing | Connects directly to load point to compensate for PCB trace IR drop; internally tied to VOUT via 10 Ω resistor. |
| BYP (Pin 4) | Noise filter node | Connects 1 µF ceramic capacitor to ground to reduce reference noise; critical for achieving 1.7 nV/√Hz spectral density. |
| EN (Pin 5) | Enable control input | Active-high logic; 1.13–1.31 V threshold enables direct drive from 1.8 V microcontrollers; 0.2 µA shutdown current. |
| REF_SENSE (Pin 6) | Feedback reference input | Sets output voltage via external resistor divider (VOUT = 1.2 V × (R1 + R2)/R2); max 10 nA leakage minimizes divider error. |
| REF (Pin 7) | Internal 1.2 V reference output | Low-noise buffered reference; must be bypassed with ≥1 µF capacitor; shorted to REF_SENSE for fixed-output configuration. |
| VREG (Pin 8) | Internal LDO amplifier supply | Provides regulated bias to control circuitry; bypassed with 1 µF capacitor; UVLO protection prevents startup below 1.94 V. |
| GND (Exposed Pad) | Power and thermal ground | Electrically connected to internal GND; must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow output noise | 0.9 µV rms (100 Hz–100 kHz) and 1.7 nV/√Hz (10 kHz–1 MHz) - preserves phase noise integrity in VCOs and synthesizers. |
| High PSRR across frequency | 72 dB (1 kHz–100 kHz) and 53 dB (1 MHz) at 2.3 V output - rejects ripple from switching regulators in mixed-signal RF platforms. |
| Stability with ceramic capacitors | Guaranteed stable with ≥7 µF X7R/X5R ceramic output capacitor - eliminates need for tantalum or electrolytic bulk capacitance. |
| Precision enable with hysteresis | 1.13–1.31 V logic high threshold and 90 mV hysteresis - prevents chatter during power-rail ramp-up in multi-rail systems. |
| Thermal and current protection | 150°C thermal shutdown with 15°C hysteresis and current limit at 1.4–2.4 A - safeguards against overload in compact enclosures. |
| Low quiescent current | 4.0 mA typical at zero load - reduces standby power in always-on RF receivers and IoT edge nodes. |
Applications
| Phase-Locked Loop (PLL) Power | Voltage-Controlled Oscillator (VCO) Bias |
|---|---|
|
Use Scenario: Supplying the core VCO and charge pump in a microwave backhaul transceiver operating at 24 GHz. IC Role / Device Role / Timing Role: Low-noise voltage source for analog tuning port and fractional-N divider bias rails. Use Value: 0.9 µV rms noise prevents close-in phase noise degradation; 72 dB PSRR isolates VCO from digital supply coupling. |
Use Scenario: Powering the varactor diode and active loop filter in a wideband 5G FR2 synthesizer. IC Role / Device Role / Timing Role: Precision 2.3 V bias regulator with remote sense for stable oscillator center frequency. Use Value: ±1.5% output accuracy over temperature maintains channel spacing; 120 mV dropout enables use with 2.5 V intermediate bus. |
| RF Front-End Module (FEM) | Small Cell Baseband Processor |
|
Use Scenario: Providing clean 2.3 V supply to GaAs power amplifier driver stages in millimeter-wave FEMs. IC Role / Device Role / Timing Role: High-current LDO with fast load transient response (2.5 A/µs slew rate) for PA envelope tracking. Use Value: Dual VOUT pins reduce impedance; 10 µF ceramic stability avoids large footprint in space-constrained modules. |
Use Scenario: Regulating 2.3 V core voltage for ARM-based baseband SoC in outdoor small cell units. IC Role / Device Role / Timing Role: Enable-controlled power domain regulator with thermal monitoring for system-level fault management. Use Value: 0.2 µA shutdown current extends battery backup runtime; exposed pad enables conduction cooling in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultralow-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP7157ARDZ-04-R7 | Optimized for 3.3 V output (VIN = 3.8 V); delivers 82 dB PSRR vs. 72 dB for −02 at same frequency band. | Higher output voltage suits FPGA I/O banks or ADC analog supplies; not suitable for 2.3 V VCO bias where headroom is constrained. | Select −04 only when target output is ≥3.0 V and input rail is ≥3.8 V; otherwise −02 provides better efficiency at 2.3 V. |
| ADM7150ACPZ-2.3-R7 | Fixed 2.3 V output; lower 800 mA current rating; 0.75 µV rms noise (100 Hz–100 kHz); 10-lead LFCSP package. | Lacks adjustability and remote sense; simpler BOM but no flexibility for future voltage scaling or load-point compensation. | Choose ADM7150 for cost-sensitive, fixed-voltage designs where 800 mA suffices and layout space permits identical footprint. |
Compared with ADP7157ARDZ-04-R7, the ADP7157ARDZ-02-R7 trades 10 dB PSRR for optimal efficiency at 2.3 V output, while ADM7150ACPZ-2.3-R7 offers lower noise and cost but sacrifices current capability and design flexibility.
Availability
ADP7157ARDZ-02-R7 is available at Aetrix Electronics and suitable for microwave backhaul, 5G small cell infrastructure, RF test equipment, and satellite communication terminals requiring stable component supply with guaranteed long-term availability.
Supply support for ADP7157ARDZ-02-R7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.
The ADP7157 series was designed specifically for RF and microwave signal chain power integrity, targeting phase noise-critical applications such as PLLs, VCOs, and high-speed data converters in infrastructure and defense systems.
FAQ
What is the maximum output current supported by the ADP7157ARDZ-02-R7?
The ADP7157ARDZ-02-R7 supports a maximum continuous output current of 1.2 A when thermally managed per its LFCSP package specifications (θJA = 53.8°C/W). Derating is required above 85°C ambient or with insufficient PCB copper area; current limit triggers between 1.4 A and 2.4 A depending on junction temperature.
Does the ADP7157ARDZ-02-R7 require external components for stability?
Yes, the ADP7157ARDZ-02-R7 requires specific external capacitors: ≥10 µF ceramic on VIN and VOUT, ≥1 µF on VREG, REF, and BYP, and ≥0.1 µF on CBYP. These values are validated for stability across −40°C to +125°C; X7R or X5R dielectrics are mandatory - Y5V/Z5U types cause instability.
How does the ADP7157ARDZ-02-R7 achieve its ultralow noise performance?
The ADP7157ARDZ-02-R7 achieves 0.9 µV rms (100 Hz–100 kHz) noise through a heavily filtered internal 1.2 V reference, unity-gain error amplifier architecture, and dedicated BYP pin for external 1 µF low-ESR capacitor. Its noise spectral density remains flat at 1.7 nV/√Hz from 10 kHz to 1 MHz, independent of output voltage setting.
Can the ADP7157ARDZ-02-R7 be used with a 2.5 V input supply?
Yes, the ADP7157ARDZ-02-R7 operates with input voltages as low as 2.3 V. With a 2.5 V input and 2.3 V output, dropout is 200 mV - within specification (max 170 mV typical at 1.2 A). Performance remains valid, though PSRR degrades slightly versus higher headroom conditions per Figure 22 in the datasheet.
What is the purpose of the VOUT_SENSE pin on the ADP7157ARDZ-02-R7?
The VOUT_SENSE pin on the ADP7157ARDZ-02-R7 enables remote voltage sensing at the load to compensate for IR drop across PCB traces. Internally connected to VOUT via a 10 Ω resistor, it must be routed directly to the load's power pin - ensuring regulation accuracy remains ±1.5% even with 100 mΩ trace resistance under full 1.2 A load.
ADP7157ARDZ-02-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 2.3V
- Voltage Dropout (Max):
- 0.17V @ 1.2A
- Current - Output:
- 1.2A
- Current - Quiescent (Iq):
- 8 mA
- Current - Supply (Max):
- 12 mA
- PSRR:
- 72dB ~ 53dB (1kHz ~ 1MHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
ADP7157ARDZ-02-R7 FAQ
1.How can I place an order for ADP7157ARDZ-02-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP7157ARDZ-02-R7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADP7157ARDZ-02-R7 reliable?
The price and inventory of ADP7157ARDZ-02-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP7157ARDZ-02-R7 is usually 5 days.
3.What payment methods are accepted for ADP7157ARDZ-02-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP7157ARDZ-02-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP7157ARDZ-02-R7?
ADP7157ARDZ-02-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP7157ARDZ-02-R7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADP7157ARDZ-02-R7?
For technical support, including ADP7157ARDZ-02-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP7157ARDZ-02-R7 requirements.
6.How does Aetrix verify that ADP7157ARDZ-02-R7 is sourced from the original manufacturer or authorized distributors?
All ADP7157ARDZ-02-R7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADP7157ARDZ-02-R7 meets industry standards.
7.What is the process for return or replacement of ADP7157ARDZ-02-R7?
All ADP7157ARDZ-02-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP7157ARDZ-02-R7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADP7157ARDZ-02-R7 part is unused and in its original packaging.
Return procedure for ADP7157ARDZ-02-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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