Texas Instruments TPS65708YZHR

Overview

TPS65708YZHR from Texas Instruments is a highly integrated power management unit (PMU) for embedded camera modules, featuring two 400-mA step-down converters (DCDC1 at 3.3 V, DCDC2 at 1.8 V), two 200-mA LDOs (VLDO1 at 2.8 V, VLDO2 at 1.2 V), and a 7.5-mA PWM-dimmable current sink for LED biasing - all in a 2.0 mm × 2.0 mm 16-ball DSBGA (YZH) package.

For engineers reviewing the TPS65708YZHR datasheet, TPS65708YZHR pinout, TPS65708YZHR application, or TPS65708YZHR equivalent, key selection considerations include its 2.25-MHz fixed-frequency PWM/PFM dual-mode operation, 180° out-of-phase DC-DC switching for reduced input ripple, dynamic voltage positioning (+1% output offset in PFM mode), internal soft-start (250 µs ramp), and factory-configured power-up sequencing (DCDC1 → LDO1 → DCDC2 → LDO2).

Technical Context

The TPS65708YZHR integrates two synchronous buck converters with voltage-mode control, input feed-forward, and 180° phase interleaving to minimize input RMS current and improve transient response. Each converter supports 3.6–6 V input, delivers up to 400 mA, and features programmable PFM/PWM mode via the MODE pin, 100% duty-cycle low-dropout operation, and internal discharge resistors (300–550 Ω) for rapid output ramp-down.

Its dual 200-mA LDOs accept 1.7–6 V input, provide ±2% output accuracy, deliver 50 dB PSRR at 10 kHz, and include thermal shutdown (150°C) and short-circuit protection (260–550 mA). The ISINK block provides a precision 7.5-mA current sink with 5–100% PWM dimming capability, 50-kHz max frequency, and 0.4–0.55 V compliance voltage depending on current level.

Key Specifications

Pinout & Package

TPS65708YZHR uses a 16-ball DSBGA (YZH) package with 0.5-mm pitch and 2.0 mm × 2.0 mm body size. Thermal resistance is R_θJA = 75°C/W, suitable for thin-profile portable designs with limited airflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power management applications.

Compared with TPS65708YZHR, TPS65105RGER omits LED drive functionality and requires external dimming circuitry, while TPS65120RSLR offers greater current headroom and flexibility at the cost of increased size and layout complexity - making TPS65708YZHR optimal for space- and cost-constrained embedded camera modules where integrated LED control is essential.

Availability

TPS65708YZHR is available at Aetrix Electronics and suitable for mobile camera modules, laptop webcams, handheld barcode scanners, and portable medical imaging devices requiring stable component supply across production lifecycles.

Supply support for TPS65708YZHR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-efficiency DC-DC conversion and precision power regulation.

The TPS65708YZHR belongs to TI's embedded camera PMU product line, designed specifically to consolidate power delivery, sequencing, and LED control into a single wafer-level chip-scale package for ultra-compact vision systems.

FAQ

What is the default output voltage configuration of TPS65708YZHR?

The TPS65708YZHR has factory-programmed fixed output voltages: DCDC1 delivers 3.3 V, DCDC2 delivers 1.8 V, LDO1 delivers 2.8 V, and LDO2 delivers 1.2 V. These values are set internally and cannot be adjusted via external resistors - the FB pins connect directly to their respective outputs without feedback dividers. This simplifies design for camera modules with standardized voltage rails.

How does the MODE pin affect TPS65708YZHR operation?

The MODE pin on TPS65708YZHR selects between two operating modes: pulled low (≤0.4 V) enables automatic PFM/PWM transition for peak efficiency across load range; pulled high (≥1.2 V) forces fixed-frequency 2.25-MHz PWM operation for consistent EMI profile and minimal output ripple. In PFM mode, quiescent current drops to 140–170 µA, critical for standby battery life.

Can TPS65708YZHR drive multiple LEDs simultaneously?

No - the TPS65708YZHR integrates a single 7.5-mA open-drain current sink (ISINK) optimized for one LED, typically used for status indication or flash assist. It does not support parallel LED strings or higher-current flash drivers. For multi-LED or high-brightness applications, external current drivers or a higher-capacity PMU like TPS65120RSLR are required. The ISINK pin must connect only to the cathode of one LED.

What is the purpose of the 180° out-of-phase operation in TPS65708YZHR?

The 180° phase shift between DCDC1 and DCDC2 in TPS65708YZHR reduces input capacitor RMS current by canceling harmonic components, allowing use of smaller 4.7-µF input capacitors instead of ≥10 µF. This lowers total solution size and cost while improving input voltage stability during simultaneous load transients - especially beneficial in battery-powered cameras where input impedance is high.

Does TPS65708YZHR support independent enable control for each regulator?

No - TPS65708YZHR lacks individual enable pins. Regulation is controlled solely by the undervoltage lockout (UVLO) circuit sensing VCC. When VCC rises above 3.6 V, internal sequencing activates DCDC1 → LDO1 → DCDC2 → LDO2 automatically. There is no software or hardware method to disable or re-order outputs; all rails are either fully on or fully off based on input voltage.