Analog Devices Inc. ADP1613ARMZ-R7

Overview

ADP1613ARMZ-R7 from Analog Devices is a current-mode PWM step-up DC-DC switching converter with integrated 2.0 A power switch, pin-selectable 650 kHz or 1.3 MHz switching frequency, adjustable output up to 20 V, and minimum input voltage of 2.5 V. It delivers high efficiency (up to 94%) in space-constrained TFT LCD bias supplies and portable instrumentation.

For engineers reviewing the ADP1613ARMZ-R7 datasheet, ADP1613ARMZ-R7 pinout, ADP1613ARMZ-R7 application, or ADP1613ARMZ-R7 equivalent, key selection criteria include its 2.0 A peak current limit, 8-lead MSOP package, UVLO threshold of 2.25 V (rising), thermal shutdown at 150°C, and soft-start capacitor-controlled startup behavior.

Technical Context

The ADP1613ARMZ-R7 uses current-mode PWM control with internal transconductance error amplifier (G_MEA = 80 µA/V) and 1.235 V feedback reference to regulate output voltage across load and line variations. Its duty cycle reaches up to 90% and supports discontinuous and continuous conduction modes.

Frequency selection is implemented via the FREQ pin: grounded for 650 kHz (±70 kHz tolerance), tied to VIN for 1.3 MHz (±100 kHz), with default 650 kHz if floating. Soft start is controlled by external capacitor on SS pin, charged at 5 µA typical to 1.2 V, limiting inrush current during enable.

Key Specifications

Pinout & Package

ADP1613ARMZ-R7 is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm × 1.1 mm height), RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-up DC-DC converter applications.

Compared with TPS61088RHLR and MAX17222ETA+, ADP1613ARMZ-R7 uniquely balances 2.0 A capability, 20 V output, pin-selectable frequency, and MSOP thermal performance-making it optimal for mid-power portable and industrial bias supplies where design flexibility and proven reliability are prioritized over extreme miniaturization or ultra-high current.

Availability

ADP1613ARMZ-R7 is available at Aetrix Electronics and suitable for TFT LCD bias supplies, portable medical instrumentation, and industrial sensor transmitters requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADP1613ARMZ-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, industrial, communications, and automotive markets.

The ADP1613ARMZ-R7 belongs to Analog Devices' ADP161x boost converter product line, designed specifically for compact, high-efficiency step-up power conversion in space- and battery-constrained applications such as portable displays and instrumentation.

FAQ

What is the minimum input voltage required for reliable operation of the ADP1613ARMZ-R7?

The ADP1613ARMZ-R7 has a guaranteed minimum input voltage of 2.5 V, with undervoltage lockout activating at 2.25 V (rising) to prevent unstable operation. Below this threshold, the device remains disabled until VIN exceeds 2.25 V. This specification ensures robust startup from partially discharged single-cell lithium sources. The ADP1613ARMZ-R7 will not function reliably below 2.5 V input, and operation near the UVLO threshold may cause intermittent regulation or increased output ripple.

How does the FREQ pin affect quiescent current in the ADP1613ARMZ-R7?

When the FREQ pin is tied to VIN to select 1.3 MHz operation, the ADP1613ARMZ-R7 draws an additional ~5 µA of quiescent current compared to the 650 kHz configuration (FREQ = GND). This extra current is active only during switching operation and is disabled in shutdown mode. In nonswitching state, IQ remains 700–1300 µA regardless of FREQ setting. Designers must account for this increase when optimizing for ultra-low standby power in battery-critical applications.

Can the ADP1613ARMZ-R7 be used to generate 20 V output from a 3.3 V input?

Yes, the ADP1613ARMZ-R7 supports output voltages up to 20 V, and generating 20 V from 3.3 V input is explicitly validated in the datasheet (Figure 8 and Figure 9 show efficiency curves at VOUT = 20 V). Achieving this requires proper selection of external components: a low-forward-drop Schottky diode (e.g., 40 V rating), low-ESR output capacitor (≥22 µF), and inductor rated for >2.0 A saturation current. Duty cycle exceeds 80%, so slope compensation may be needed for stability in continuous conduction mode.

What happens to the output voltage when the ADP1613ARMZ-R7 is placed in shutdown via the EN pin?

When EN is driven low (<0.3 V), the ADP1613ARMZ-R7 disables its internal switch and enters shutdown mode with IQSHDN ≤ 2 µA. However, because the inductor and output rectifier form a dc path, the output voltage drops only to VIN minus the diode forward voltage (typically ~0.3–0.5 V), rather than to 0 V. This behavior preserves bias on downstream circuitry but does not fully isolate VOUT. For true output disconnection, an external PMOS high-side switch or load switch is required in series with the output rail.

How is soft start duration determined for the ADP1613ARMZ-R7?

Soft start duration in the ADP1613ARMZ-R7 is set by the capacitor connected between SS pin and GND. The internal 5 µA current source charges this capacitor until it reaches 1.2 V, at which point full regulation begins. For example, a 33 nF capacitor yields ~8.3 ms ramp time (t = 1.2 V / 5 µA × 33 nF), while a 100 nF capacitor extends it to ~24 ms. The SS pin is actively discharged during shutdown, thermal fault, or UVLO, ensuring repeatable startup behavior across power cycles.