PMP21884

Tiny, ultra-low IQ DC/DC power supply with battery charging reference design for wearables

PMP21884

Design files

Overview

This is a highly-integrated power supply reference design for smartwatches and fitness trackers enabling ultra-low IQ that is ultra-small (48 sq mm). Supply includes seven power rails including battery charger, LDO, DC/DC buck converters and integrated boost converter for heart rate monitor, AFE LED drive supply or PMOLED bias.

Features
  • Ultra-small (48 mm²) total footprint power supply
  • 400-nA IQ linear battery charge management with fast charge, LDO, load switch, ADC, over-voltage and over-current protection
  • Selectable, integrated boost rail for PMOLED display or heart-rate monitor LED driver
  • Seven rails for various peripherals:
    • 1.8 V at 1 A
    • 1.8 V at 0.3 A
    • 1.8 V at 0.1 A
    • 1.8 V at 0.1 A
    • 1.2 V at 0.2 A
    • 12 V at 0.06 A or
    • 5 V at 0.150 A
Output voltage options PMP21884.1 PMP21884.2 PMP21884.3 PMP21884.4 PMP21884.5 PMP21884.6 PMP21884.7
Vin (Min) (V) 3 3 3 3 3 3 3
Vin (Max) (V) 6 6 6 6 6 6 6
Vout (Nom) (V) 1.8 1.2 1.8 1.8 1.8 1.8 12
Iout (Max) (A) .01 .2 .1 1 .3 .1 .06
Output Power (W) .018 .24 .18 1.8 .54 .18 .72
Isolated/Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC DC DC DC DC DC
Topology Linear Regulator Linear Regulator Linear Regulator Buck- Integrated Switch Buck- Integrated Switch Load Share Boost- Integrated Switch

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDT103.PDF (1604 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDRZK6.PDF (143 K)

Detailed schematic diagram for design layout and components

TIDRZK7.PDF (57 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRZK8.PDF (80 K)

Detailed overview of design layout for component placement

TIDRZL0.ZIP (607 K)

Files used for 3D models or 2D drawings of IC components

TIDCFF7.ZIP (658 K)

Design file that contains information on physical board layer of design PCB

TIDRZK9.PDF (882 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Battery charger ICs

BQ25150I2C controlled 500-mA linear battery charger with Power Path,  Low Iq, integrated LDO and 16-bit ADC

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS62770Tiny Single-chip Dual Solution with 360nA Iq Buck and up to 15V Boost in WCSP

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS628021.8V-5.5V input, 1-A ultra-low Iq step-down converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
ESD & surge protection ICs

TPD1E6B066-pF, ±5.5V, ±15-kV ESD protection diode in 0201 package

Data sheet document-pdfAcrobat PDF open-in-new HTML
ESD & surge protection ICs

TPD2E001-Q1Automotive Dual 1.5-pF, 5.5-V, ±8-kV ESD protection diode with VCC pin for USB 2.0

Data sheet document-pdfAcrobat PDF
Linear & low-dropout (LDO) regulators

TPS7A05200-mA, ultra-low-IQ, high-accuracy, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Test report Tiny, Ultra-Low Iq DC-DC Power Supply With Battery Charging Reference Design Apr. 22, 2019

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