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TPS61070DDCR

90% sync boost, 600mA sw, 0.9-5.5V in, 19uA Iq, TSOT-23-6

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Manufacturer Part：

TPS61070DDCR

Package：

ThinSOT-23-6 (2.9 x 1.6 x 0.87 mm)

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Description

Product Overview

The TPS61070DDCR from Texas Instruments is a 90% efficient synchronous boost converter with 600mA switch current in a 6-pin ThinSOT-23 package. With 0.9V to 5.5V input range, adjustable output up to 5.5V, 19uA quiescent current, power-save mode, and load disconnect during shutdown, it is ideal for single-cell battery-powered applications.

Key Specifications

Topology Synchronous boost (step-up)
Input Voltage 0.9V to 5.5V
Output Voltage 1.8V to 5.5V (adjustable)
Switch Current Limit 600mA typical (700mA max)
Output Current 75mA @ 3.3V from 0.9V; 150mA @ 3.3V from 1.8V; 200mA @ 5V from 3.3V
Efficiency Up to 90%
Switching Frequency 1.2 MHz (fixed)
Quiescent Current 19 uA typical
Shutdown Current 0.5 uA (load disconnected)
Power-Save Mode Yes (TPS61070, PFM at light load)
Load Disconnect Yes (during shutdown)
Output Voltage Accuracy +/-2%
Reference Voltage 0.5V (typical)
EN Pin Active high, internal pulldown
Operating Temperature -40 to +85 C (ambient); -40 to +125 C (junction)
Package ThinSOT-23-6 (2.9 x 1.6 mm)
Status Active

Features

  • 90% efficient synchronous boost converter
  • 0.9V minimum input for single-cell operation
  • 19uA quiescent current
  • 1.2MHz fixed frequency PWM with PFM power-save
  • Synchronous rectifier (no external Schottky)
  • True load disconnect during shutdown
  • 0.5uA shutdown current
  • Adjustable output via external resistor divider
  • Over-temperature protection
  • Small ThinSOT-23-6 package

Applications

  • Single-cell alkaline/NiMH battery devices
  • Li-ion powered portable audio players
  • White LED lighting
  • 5V USB power from 3.3V or Li-ion

The TPS61070DDCR from Texas Instruments is a 90% efficient synchronous boost converter with 600mA peak switch current in a 6-pin ThinSOT-23 package. The DDC denotes the ThinSOT-23-6 package, R denotes tape and reel (3000 pcs/reel). The device operates from input voltages as low as 0.9V, making it suitable for single-cell alkaline, NiMH, or Li-ion battery applications. The synchronous rectifier eliminates the need for an external Schottky diode, reducing component count and board space. At moderate to high loads, the device operates in fixed 1.2MHz PWM mode for low output ripple. At light loads, the TPS61070 enters power-save mode (PFM) to maintain high efficiency by skipping switching cycles, reducing gate drive and switching losses. The 19uA quiescent current minimizes battery drain during idle periods. During shutdown (EN low), the load is completely disconnected from the battery with only 0.5uA shutdown current. The output voltage is set by an external resistor divider from VOUT to FB, with an internal 0.5V reference. Over-temperature protection shuts down the device at approximately 150C junction temperature.

The TPS61070DDCR operates through four subsystems: (1) Boost Power Stage: An internal N-channel MOSFET switch and a synchronous P-channel MOSFET rectifier form the boost topology. When the switch turns ON, inductor current ramps up storing energy in the magnetic field. When the switch turns OFF, the synchronous rectifier turns ON, transferring stored energy to the output capacitor and load. The 1.2MHz switching frequency enables small external inductor and capacitor values. (2) PWM/PFM Control: At loads above the power-save threshold, fixed-frequency PWM operation provides low output ripple and tight regulation. The error amplifier compares the FB pin voltage with the 0.5V reference and adjusts the switch duty cycle. At light loads, the device enters PFM mode: it performs a burst of switching cycles to raise the output above the regulation point, then enters a low-quiescent-current idle period until the output drops below the threshold again. This significantly improves efficiency at light loads. (3) Synchronous Rectification: The internal P-channel MOSFET replaces an external Schottky diode, reducing forward voltage drop from approximately 0.3V to near-zero (RDS(ON) * I), improving efficiency especially at low output voltages. (4) Load Disconnect: During shutdown (EN pin low), both the switch and synchronous rectifier are off, disconnecting the load from the battery. This prevents battery drain through the inductor and rectifier that would occur with a non-synchronous boost converter.

Pin Name Type Description
1 EN Input Enable (active high, internal pulldown)
2 VIN Power Input voltage / inductor connection (0.9-5.5V)
3 SW Power Switch node (inductor and internal MOSFET)
4 GND Power Ground
5 FB Input Feedback voltage (0.5V reference, external divider)
6 VOUT Power Output voltage and sense
  • Single-cell alkaline to 3.3V boost for portable sensor node with 75mA output, 19uA Iq during idle, and power-save PFM mode
  • Li-ion (3.0-4.2V) to 5V USB power at 200mA with 90% efficiency, load disconnect during shutdown
  • White LED driver from 3.3V rail using boost to 5V with 1.2MHz small inductor/capacitor and synchronous rectification
  • NiMH battery (2.4V typical) to 3.3V boost at 150mA with adjustable output via FB resistor divider
Model Manufacturer Isw Iq Notes
TPS61071DDCR TI 600mA 19uA No power-save (forced PWM)
TPS61073DDCR TI 600mA 19uA 1.8V EN threshold, power-save
TPS61021AYPGR TI 3A 1.3uA Higher current, ultra-low Iq
MT3608 Aerosemi 2A ~100uA Higher current, lower cost
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