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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Diodes Incorporated PAM2319AYAA

Name: PAM2319AYAA
Brand: Diodes Incorporated
SKU: PAM2319AYAA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PAM2319AYAA

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 12-WFDFN Exposed Pad

Datasheet:: PAM2319AYAA.pdf

Description:: IC REG BUCK ADJ 1A/2A DL 12WDFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PAM2319AYAA from Diodes Incorporated is a dual-channel, current-mode PWM step-down DC-DC converter with integrated synchronous rectifiers, operating across 2.7V–5.5V input and delivering adjustable 1.0V–3.3V outputs (1A on Channel 1, 2A on Channel 2), optimized for battery-powered portable electronics requiring high efficiency and ultra-low quiescent current.

For engineers reviewing the PAM2319AYAA datasheet, PAM2319AYAA pinout, PAM2319AYAA application, or PAM2319AYAA equivalent, this device supports dual independent enable control (EN1/EN2), 3MHz/2.5MHz switching frequencies, pulse-skipping mode for light-load efficiency, and thermal/short-circuit protection - critical for compact, thermally constrained power designs.

Technical Context

The PAM2319AYAA integrates two independent buck regulators sharing a common input voltage domain but featuring separate feedback (FB1/FB2), enable (EN1/EN2), and switching nodes (SW1/SW2). Each channel employs internal P-channel and N-channel MOSFETs with R_DS(ON) of 0.35Ω/0.45Ω (Ch1) and 0.11Ω/0.85Ω (Ch2), enabling high-efficiency synchronous conversion without external switches.

It implements current-mode control with soft-start (2ms Ch1 / 250ms Ch2), under-voltage lockout (2.5V rising threshold Ch1, 2.7V Ch2), and hiccup-mode short-circuit protection with configurable counter depth based on FB voltage. Thermal shutdown activates at 150°C with 30°C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.7V to 5.5V - supports single Li+/Li-Po cell, USB, or multi-cell alkaline/NiMH sources.
Output Voltage Range	1.0V to 3.3V (adjustable via external resistor divider) - set by 0.6V internal reference with ±3% accuracy.
Max Output Current	1A (Channel 1), 2A (Channel 2) - peak inductor current limits are 1.5A and 3A respectively.
Switching Frequency	3MHz (Ch1), 2.5MHz (Ch2) - enables use of small 1µH inductors and ceramic capacitors.
Quiescent Current	40µA (Ch1), 55µA (Ch2) - ensures extended battery life in standby via Pulse-Skipping Modulation (PSM).
Shutdown Current	<0.1µA - disconnects input from output during disable, minimizing system leakage.
Package	W-DFN3x3-12L with exposed thermal pad - 60°C/W θ_JA, requires PCB copper area and vias for thermal management.

Pinout & Package

Package: W-DFN3×3-12L (3mm × 3mm, 0.75mm height) with exposed thermal pad connected to GND. Requires soldering of thermal pad for thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
1 FB2	Channel 2 feedback input	Connects to resistor divider; regulates Vo2 to 0.6V reference; sets output voltage.
2 VIN2	Channel 2 input supply	Accepts 2.7–5.5V; must be decoupled locally with low-ESR capacitor near AGND2.
3 AGND2	Channel 2 analog ground	Reference for FB2, EN2, and internal error amplifier; separate from PGND2 to reduce noise coupling.
4 VIN1	Channel 1 input supply	Shared or independent input; decouple close to PGND1 and AGND1.
5 PGND1	Channel 1 power ground	High-current return path for SW1 and internal MOSFETs; connect to input capacitor ground first.
6 SW1	Channel 1 switch node	Drain connection of internal P/N-MOSFET pair; drives external inductor; high dv/dt node.
7 FB1	Channel 1 feedback input	Regulates Vo1 to 0.6V reference; precision matching required for stable output voltage.
8 AGND1	Channel 1 analog ground	Reference for FB1, EN1, and internal circuitry; tie to PGND1 at single point near input cap.
9 EN1	Channel 1 enable input	Active-high logic; 1.5V threshold; controls startup sequence and soft-start initiation.
10 EN2	Channel 2 enable input	Independent active-high control; allows staggered or asynchronous channel sequencing.
11 PGND2	Channel 2 power ground	High-current return for SW2; keep trace short and wide; avoid shared paths with AGND2.
12 SW2	Channel 2 switch node	Drain connection for Ch2 MOSFETs; drives second inductor; requires tight layout to minimize EMI.
Exposed Pad	Thermal & electrical ground	Mandatory GND connection via multiple vias to inner-layer copper pour for thermal dissipation.

Key Features

Feature	Design Value
Dual independent PWM channels	Separate EN, FB, SW, and ground pins enable independent sequencing, fault isolation, and flexible rail assignment.
Synchronous rectification	Integrated P/N-MOSFETs eliminate external diodes, achieving >87% efficiency at 500mA (Ch2) and reducing BOM count.
Pulse-Skipping Modulation (PSM)	Reduces quiescent current to 40/55µA and maintains regulation at light loads without external control.
Comprehensive protection suite	Includes UVLO, thermal shutdown (150°C), hiccup-mode short-circuit protection, and cycle-by-cycle current limiting.
Small-footprint W-DFN3x3-12L	3mm × 3mm package with thermal pad supports high power density and meets RoHS/REACH requirements.

Applications

Smartphone Baseband Power

Wireless Modem Core Supply

Use Scenario: Dual-rail power delivery for baseband processor (1.2V core) and RF transceiver (1.8V I/O) in space-constrained smartphone PCBs.

IC Role / Device Role / Timing Role: Primary dual-output DC-DC regulator providing independently enabled, low-noise, high-efficiency rails with fast transient response.

Use Value: Enables simultaneous operation of digital and RF subsystems while maintaining <10mV output ripple and <2ms soft-start timing per rail.

Use Scenario: Powering DSL/wireless modem SoC requiring 1.5V CPU core and 3.3V PHY interface from single 3.3V or 5V input source.

IC Role / Device Role / Timing Role: Dual buck controller managing load-step transitions between idle and burst transmission modes.

Use Value: Delivers 2A at 1.5V and 1A at 3.3V with PSM extending battery runtime during low-traffic periods.

Portable Medical Monitor

Industrial Handheld Terminal

Use Scenario: Battery-operated ECG monitor needing isolated 1.0V sensor bias and 2.5V ADC reference with minimal self-heating.

IC Role / Device Role / Timing Role: Precision dual-output regulator with low IQ and thermal shutdown ensuring safe operation during extended clinical use.

Use Value: Maintains <±3% output accuracy over –40°C to +85°C ambient and shuts down before junction exceeds 125°C continuous limit.

Use Scenario: Rugged handheld terminal using Li-ion battery and requiring 1.8V FPGA core and 3.3V display interface with robust fault handling.

IC Role / Device Role / Timing Role: Fault-tolerant dual buck converter with hiccup-mode protection against accidental short circuits on display flex cable.

Use Value: Survives repeated short events without latch-up; resumes operation automatically after thermal recovery and soft-start reinitialization.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS65023BRSBR	Triple-output (2 buck + 1 LDO); 2.7–5.5V input; 1.2–3.3V adjustable; 600mA/600mA/200mA; 2.25MHz fixed frequency.	Lacks independent enable per buck channel; includes integrated LDO but lower current capability per rail.	Preferred when third regulated rail or tighter output tolerance (±1%) is required; less suitable for asymmetric 1A/2A loads.
RT8070ZSP	Dual buck only; 2.7–5.5V input; 0.6–3.3V output; 1.5A/1.5A; 1.5MHz switching; no PSM mode; higher IQ (120µA).	Fixed 1.5A per channel; no light-load efficiency optimization; simpler control but reduced battery life in standby.	Appropriate for cost-sensitive industrial applications where light-load efficiency is secondary to BOM simplicity.

Compared with TPS65023BRSBR and RT8070ZSP, the PAM2319AYAA uniquely balances asymmetric current capability (1A/2A), independent enable control, and ultra-low-light-load IQ - making it optimal for portable systems with mixed-power-rail architectures and strict battery runtime targets.

Availability

PAM2319AYAA is available at Aetrix Electronics and suitable for smartphone baseband power, wireless modem core supply, portable medical monitors, and industrial handheld terminals requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for PAM2319AYAA 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and ICs, specializing in high-performance power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The PAM2319 belongs to Diodes' Power Management IC product line, designed specifically for space- and efficiency-constrained portable electronics requiring dual independent DC-DC regulation with minimal external components.

FAQ

What is the recommended minimum inductor value for Channel 2 at 2A output?

For Channel 2 delivering 2A, Diodes recommends starting with a 1.2µH inductor to achieve ~800mA peak-to-peak ripple current (40% of 2A). The inductor's DC resistance should be minimized, and its saturation current rating must exceed 3A (2A load + 1A ripple margin) to prevent core saturation under transient conditions.

How does the hiccup-mode short-circuit protection behave differently between Channel 1 and Channel 2?

Channel 1 uses fixed-cycle 1MHz operation with ~350mA average input current during short, while Channel 2 implements a configurable counter-based hiccup mode: counter depth (3-bit or 6-bit) depends on FB2 voltage, and typical hiccup duty cycle is 1.7%, allowing automatic recovery after thermal cooldown without external intervention.

Can FB1 and FB2 be tied together to force identical output voltages?

No - FB1 and FB2 are separate high-impedance inputs referencing independent internal 0.6V references. Tying them together creates unintended interaction between feedback loops and risks instability or inaccurate regulation. Each channel requires its own dedicated resistor divider network.

Is the exposed thermal pad electrically isolated or must it be connected to ground?

The exposed thermal pad is internally connected to PGND and must be soldered to a PCB GND plane using ≥4 thermal vias (0.3mm diameter) to an inner-layer copper pour. Leaving it unconnected degrades thermal performance and may cause junction temperature exceedance above 125°C during sustained 2A operation.

PAM2319AYAA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 12-WFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 2

Voltage - Input (Min):: 2.7V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 1V

Voltage - Output (Max):: 3.3V

Current - Output:: 1A, 2A

Frequency - Switching:: 3MHz, 2.5MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: W-DFN3030-12

PAM2319AYAA FAQ

1.How can I place an order for PAM2319AYAA through Aetrix?

Please submit a Request for Quotation (RFQ) for PAM2319AYAA 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 PAM2319AYAA reliable?

The price and inventory of PAM2319AYAA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2319AYAA is usually 5 days.

3.What payment methods are accepted for PAM2319AYAA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2319AYAA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PAM2319AYAA?

PAM2319AYAA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PAM2319AYAA 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 PAM2319AYAA?

For technical support, including PAM2319AYAA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2319AYAA requirements.

6.How does Aetrix verify that PAM2319AYAA is sourced from the original manufacturer or authorized distributors?

All PAM2319AYAA 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 PAM2319AYAA meets industry standards.

7.What is the process for return or replacement of PAM2319AYAA?

All PAM2319AYAA units undergo pre-shipment inspection (PSI). If there is an issue with PAM2319AYAA, 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 PAM2319AYAA part is unused and in its original packaging.

Return procedure for PAM2319AYAA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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