TPS63000 — High-Efficiency Single-Inductor Buck-Boost Converter

Overview

The TPS63000 (packaged in 10-pin VSON TPS63000DRCR) is a high-efficiency synchronous buck-boost DC-DC converter manufactured by Texas Instruments. Designed for products powered by a single Li-Ion/Li-Po cell, 2-to-3 cell alkaline/NiMH batteries, or USB ports, it regulates output voltage from input supplies ranging from $1.8\text{ V}$ to $5.5\text{ V}$ .

Utilizing a single $2.2\ \mu\text{H} \dots 4.7\ \mu\text{H}$ inductor, the TPS63000 delivers up to $1200\text{ mA}$ continuous output current in buck mode and $800\text{ mA}$ in boost mode at $3.3\text{ V}$ output with conversion efficiency up to $96\%$ .

Quick reference


Regulator Type	Synchronous Single-Inductor Buck-Boost Converter
Package	VSON-10 (DRC / $3\times3\text{ mm}$ Exposed Thermal Pad)
Input Voltage Range ( $V_{IN}$ )	$1.8\text{ V}$ to $5.5\text{ V}$ DC
Output Voltage Range ( $V_{OUT}$ )	$1.2\text{ V}$ to $5.5\text{ V}$ DC (Adjustable) / Fixed 3.3V, 5.0V
Continuous Output Current ( $I_{OUT}$ )	$1200\text{ mA}$ (Buck mode) / $800\text{ mA}$ (Boost mode at 3.3V)
Switching Frequency	$1.5\text{ MHz}$ fixed internal clock
Conversion Efficiency	Up to $96\%$
Features	Power Save mode ( $30\ \mu\text{A}$ $I_Q$ ), over-temperature & over-current protection

Pinout (VSON-10 Package)

text

        ┌─────────────┐
   VINA ─│ 1        10 │─ VOUT
    GND ─│ 2         9 │─ FB
     L1 ─│ 3    EP   8 │─ PS
    VIN ─│ 4         7 │─ EN
     L2 ─│ 5         6 │─ PGND
        └─────────────┘

Pin	Name	Description
1	`VINA`	Supply input for internal control logic circuitry
2	`GND`	Control logic ground reference
3	`L1`	Inductor connection 1 (Switch node for input MOSFETs)
4	`VIN`	Power stage input supply (+1.8V to +5.5V DC)
5	`L2`	Inductor connection 2 (Switch node for output MOSFETs)
6	`PGND`	Power stage ground reference (connected to thermal pad underneath)
7	`EN`	Enable control pin (>1.2V = Enabled, <0.4V = Disabled)
8	`PS` / `SYNC`	Power Save mode control pin (GND = Power Save enable, VINA = forced PWM)
9	`FB`	Voltage feedback sense input pin ( $500\text{mV}$ reference)
10	`VOUT`	Regulated DC output voltage pin

Specifications

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Input Voltage Range	$V_{IN}$	1.8	3.7	5.5	V	Operational input range
Feedback Reference Voltage	$V_{FB}$	495	500	505	mV	$T_A = 25^\circ\text{C}$
Buck Output Current	$I_{OUT\_BUCK}$	1200	—	—	mA	$V_{IN} = 3.6\text{V} \dots 5.5\text{V}, V_{OUT} = 3.3\text{V}$
Boost Output Current	$I_{OUT\_BOOST}$	800	—	—	mA	$V_{IN} = 2.4\text{V}, V_{OUT} = 3.3\text{V}$
Switch Current Limit	$I_{CL}$	1700	2000	2400	mA	Peak inductor current limit
Switching Frequency	$f_{SW}$	1.25	1.50	1.75	MHz	Internal oscillator
Quiescent Current	$I_Q$	—	30	50	$\mu\text{A}$	Power Save mode active

Typical Application Circuit (Single Li-Ion Cell to 3.3V Output)

text

       +V_IN (1.8V - 5.5V Li-Ion / USB Input)
          │
       [Pin 4: VIN] ── [Pin 3: L1] ─── [ 2.2µH Inductor ] ─── [Pin 5: L2] ─── TPS63000 ─── [Pin 10: VOUT] ─── +3.3V Output
          │                                                                                     │
       [Pin 6: PGND]                                                                         [ R1 ]
          │                                                                                     │
         GND ───────────────────────────────────────────────────────────────────────────────────┴─── [Pin 9: FB]
                                                                                                │
                                                                                              [ R2 ]
                                                                                                │
                                                                                               GND

$V_{OUT} = 500\text{mV} \times \left( 1 + \frac{R_1}{R_2} \right)$

Common mistakes

Separating VINA from VIN without filtering: Pin 1 (VINA) supplies control logic. Connecting VINA to noisy high-current VIN without an RC filter ( $10\ \Omega$ and $1\ \mu\text{F}$ ) can introduce jitter into the feedback loop.
Inadequate Inductor Saturation Rating: Use an inductor rated for at least $2.0\text{ A}$ continuous saturation current ( $I_{SAT}$ ) to avoid core saturation during maximum load step transients.

Notes

Li-Ion Discharge Advantage: Provides steady 3.3V power even as a Li-Ion battery drops from 4.2V fully charged down to 2.8V discharged, eliminating the dead zone of standard LDOs or buck-only switchers.

Interface	DC Input, DC Output, Dual Switch Nodes L1 & L2
Package	VSON-10 (DRC / 3 x 3 mm)