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TPS62177RGTR

28V 0.5A sync buck, 3.3V fixed, DCS-Control, 4.8µA Sleep IQ, 1MHz, 100% duty, 2x3mm WSON-10

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Manufacturer Part：

TPS62177RGTR

Package：

10-pin WSON (2.0 x 3.0 x 0.8mm)

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Description

Product Overview

The TPS62177RGTR is a 28V, 0.5A synchronous step-down DC/DC converter from Texas Instruments featuring DCS-Control topology and a unique Sleep mode with 4.8µA quiescent current. With a 4.75V to 28V input range, 3.3V fixed output, and 1MHz switching frequency, it is ideal for 12V and 24V bus-powered systems requiring ultra-low standby power. The 2x3mm 10-pin WSON package minimizes board area.

Key Specifications

Topology Synchronous Buck (DCS-Control)
Input Voltage 4.75V to 28V
Output Voltage 3.3V fixed
Output Current 500mA
Switching Frequency 1MHz (typical)
Quiescent Current (Normal) 22µA
Quiescent Current (Sleep) 4.8µA
Shutdown Current <2µA
Efficiency Up to 95%
Output Voltage Accuracy ±1.6% to ±2.9%
Duty Cycle Up to 100%
Power Good Output Yes
Active Output Discharge Yes
Package 10-pin WSON (2 x 3mm)
Operating Temperature -40°C to +85°C

Features

  • DCS-Control topology for seamless PWM/power-save transitions
  • 4.75V to 28V wide input voltage range
  • Ultra-low 4.8µA Sleep mode quiescent current
  • 100% duty cycle mode for lowest dropout
  • Active output discharge for clean shutdown
  • Power Good output for power sequencing
  • Seamless power save mode transition
  • Adjustable UVLO with hysteresis
  • Short circuit and overtemperature protection
  • 2mm x 3mm 10-pin WSON package

Applications

  • 12V/24V point-of-load power supplies
  • Ultra-mobile PC and embedded systems
  • Low-power microcontroller power rails
  • Industrial sensor and meter power
  • Battery-powered always-on systems
  • Efficient LDO replacement

The TPS62177RGTR is a high-efficiency synchronous step-down DC/DC converter from Texas Instruments, featuring TI’s proprietary DCS-Control topology for fast transient response and seamless mode transitions. The device accepts 4.75V to 28V input and provides a fixed 3.3V output at up to 500mA. Its standout feature is the Sleep mode, which reduces quiescent current to just 4.8µA — up to 20% efficiency improvement at very light loads compared to normal mode. The 100% duty cycle capability allows operation with minimal input-to-output voltage difference. The power good output enables power sequencing, while active output discharge ensures a clean shutdown. Housed in a tiny 2x3mm WSON-10 package, it is ideal for space-constrained, always-on industrial and portable applications.

The TPS62177 uses DCS-Control (Direct Control with Seamless transition), a proprietary control topology combining voltage-mode and current-mode regulation. In PWM mode, the device operates at a fixed ~1MHz frequency with synchronous rectification for high efficiency. When the load drops below the power-save threshold, the device seamlessly transitions to PFM (pulse-frequency modulation) mode, skipping pulses to maintain regulation with minimal switching losses. In Sleep mode, the device further reduces quiescent current to 4.8µA by partially disabling internal circuitry while maintaining output regulation. The SNOOZE pin selects between normal and sleep modes. The 100% duty cycle mode keeps the high-side MOSFET on continuously when the input voltage approaches the output voltage, functioning like a low-dropout switch. The power good comparator monitors the FB voltage and de-asserts PG when output drops below 95% of the target.

Pin Name Description
1 EN Enable input (active high, internal pull-up)
2 VIN Input supply (4.75V to 28V)
3 VIN Input supply (connect to pin 2)
4 SW Switch node (connect to inductor)
5 PGND Power ground
6 PGND Power ground
7 FB Feedback input (connect to VOS or resistor divider)
8 PG Power good output (open drain)
9 SLEEP Sleep mode enable (active high = sleep mode)
10 VOS Output sense (connect to output for fixed Vout)
Pad AGND Analog ground (exposed thermal pad)
  • Low-Power MCU Rail from 12V: Power a Cortex-M4 microcontroller’s 3.3V rail from a 12V bus. The 4.8µA Sleep mode IQ extends battery life in duty-cycled applications where the MCU sleeps 99% of the time. When the MCU enters deep sleep, assert the SLEEP pin to reduce converter IQ from 22µA to 4.8µA, achieving up to 20% efficiency improvement at sub-100µA loads.
  • Industrial Sensor Always-On Supply: Provide a 3.3V rail for a wireless sensor node powered from a 24V industrial bus. The 28V maximum input accommodates the 24V ±20% tolerance. The 100% duty cycle mode maintains output regulation when the bus voltage drops near 3.3V during brown-out conditions. The PG output resets the sensor when voltage recovers.
  • LDO Replacement: Replace a 12V-to-3.3V LDO that wastes 8.7V × load current as heat. At 300mA, the TPS62177 delivers ~90% efficiency versus the LDO’s 27%, reducing dissipation from 2.6W to ~0.12W and eliminating the need for a heatsink. The 2x3mm WSON footprint is comparable to many SOT-223 LDOs.
Model Vin Max Iout IQ Sleep Key Difference
TPS62175DQCR 28V 500mA 4.8µA Adjustable output version
TPS62080 6V 1.2A 18µA Lower Vin, higher Iout, no sleep
LMR16006 60V 600mA 25µA TI, higher Vin, non-sync
MAX17503 60V 500mA 3.4µA ADI/Maxim, higher Vin, lower IQ
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