Monolithic Power Systems Inc. MP1496SGJ-P

Overview

MP1496SGJ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 150mΩ high-side and 70mΩ low-side MOSFETs, delivering up to 2A continuous output current across a 4.5V–16V input range, fixed 500kHz switching frequency, and adjustable output voltage starting at 0.8V - deployed in notebook I/O power and flat-panel display supplies.

For engineers reviewing the MP1496SGJ-P datasheet, MP1496SGJ-P pinout, MP1496SGJ-P application, or MP1496SGJ-P equivalent, key selection considerations include its internal MOSFET R_DS(on), external soft-start programmability via SS pin, hiccup-mode over-current protection, thermal shutdown at 150°C, and EN/SYNC dual-function pin supporting both enable control and 300kHz–2MHz clock synchronization.

Technical Context

The MP1496SGJ-P employs peak-current-mode control with a fixed 500kHz oscillator and fold-back frequency reduction (to 250kHz) when FB falls below 400mV, enabling robust short-circuit protection. Its proprietary bootstrap charging circuit maintains gate drive for the high-side MOSFET using an external BST capacitor and supports optional external diode enhancement for high-duty-cycle operation.

It integrates a 5V internal VCC regulator powered from VIN, an error amplifier with 0.807V reference (±1.5% over temperature), and cycle-by-cycle over-current protection with hiccup recovery. The LS-FET negative current limit prevents reverse inductor current in DCM mode, and thermal shutdown activates at 150°C with 20°C hysteresis.

Key Specifications

Pinout & Package

MP1496SGJ-P is housed in an 8-pin TSOT23 package - ultra-compact surface-mount footprint (2.9mm × 1.6mm × 0.85mm) optimized for space-constrained portable and display applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with MP1496SGJ-P, MP2451DT-LF-Z trades hiccup OCP and SYNC flexibility for higher voltage/current headroom, while TPS562201DDFR sacrifices design control (no SS, no SYNC) to reduce size and component count - making MP1496SGJ-P optimal for balanced performance, protection, and layout flexibility in mid-power portable designs.

Availability

MP1496SGJ-P is available at Aetrix Electronics and suitable for notebook computers, digital set-top boxes, flat-panel television logic supplies, and distributed power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP1496SGJ-P 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan.

The MP1496S product line targets space-constrained, efficiency-critical DC/DC conversion in portable and display electronics - emphasizing integration, thermal resilience, and ease of layout in ultra-small packages.

FAQ

What is the maximum recommended output current for MP1496SGJ-P under continuous operation?

The MP1496SGJ-P is rated for 2A continuous output current under specified thermal conditions (TA ≤ +85°C, proper PCB copper area). Derating is required above 85°C ambient; at 125°C junction temperature, maximum sustainable output drops to ~1.3A due to thermal shutdown activation at 150°C.

Can MP1496SGJ-P operate with an input voltage below 4.5V?

No - the absolute minimum operating input voltage is 4.5V per datasheet specifications. Below this, the internal UVLO prevents startup. The under-voltage lockout rising threshold is 3.9V ±0.3V, but functional regulation only begins above 4.5V due to VCC regulator requirements and MOSFET gate drive limitations.

How does the EN/SYNC pin function in enable versus synchronization mode?

When driven high (>1.4V), EN/SYNC enables the converter. When an external clock signal (300kHz–2MHz, 1.5V–5.5V amplitude) is applied, the internal oscillator synchronizes to its rising edge - provided the chip is already enabled and the clock is stable for ≥2ms before first switching cycle.

What is the purpose of the BST pin, and what capacitor value is recommended?

The BST pin provides the floating supply for the high-side MOSFET gate driver. A 0.1µF ceramic capacitor is recommended between BST and SW pins. Adding a 10Ω resistor in series with the BST capacitor reduces switching-node ringing and improves reliability in noisy layouts.

Does MP1496SGJ-P require external compensation components?

No - the MP1496SGJ-P features an internally compensated error amplifier optimized for standard output capacitor ESR and capacitance ranges. No external compensation network is needed, simplifying design and reducing BOM count for most 1–10µH inductor applications.

Is the feedback reference voltage adjustable or fixed?

The internal reference is fixed at 0.807V (typical), with ±1.5% tolerance over temperature. Output voltage is adjusted externally using a resistor divider from VOUT to FB, with R2 calculated as R2 = R1 × (VOUT / 0.807 − 1); no trimming or adjustment of the reference itself is possible.

What happens during a sustained output short-circuit condition?

When FB falls below ~400mV, the MP1496SGJ-P enters fold-back frequency mode (~250kHz) and triggers hiccup protection: it shuts down, waits ~30ms, then attempts restart. This limits average power dissipation and junction temperature, preventing damage during prolonged shorts.