TPS63020 — 4A Switch High-Efficiency Buck-Boost Converter

Overview

The TPS63020 (packaged in a 14-pin VSON TPS63020DSJR) is a high-current synchronous buck-boost DC-DC converter manufactured by Texas Instruments. Designed for high-power handheld devices, single-cell Li-Ion battery systems, and USB Type-C power rails, it integrates 4.0 A internal N-channel and P-channel MOSFET switches.

Operating at a fast $2.4\text{ MHz}$ switching frequency, the TPS63020 delivers up to $3.0\text{ A}$ output current in buck mode and $2.0\text{ A}$ in boost mode at $3.3\text{ V}$ output with conversion efficiency up to $96\%$ , using tiny $1.0\ \mu\text{H} \dots 1.5\ \mu\text{H}$ inductors.

Quick reference


Regulator Type	High-Current Synchronous Buck-Boost Converter
Package	VSON-14 (DSJ / $3\times4\text{ mm}$ 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
Continuous Output Current ( $I_{OUT}$ )	$3.0\text{ A}$ (Buck mode) / $2.0\text{ A}$ (Boost mode at 3.3V)
Switching Frequency	$2.4\text{ MHz}$ fixed internal clock
Conversion Efficiency	Up to $96\%$
Protection Features	Power-Good output (`PG`), Power Save mode, over-temp & short-circuit protection

Pinout (VSON-14 Package)

text

        ┌─────────────┐
   VINA ─│ 1        14 │─ VOUT
   GND  ─│ 2        13 │─ FB
    FB  ─│ 3   EP   12 │─ PG
     L1 ─│ 4        11 │─ PS/SYNC
    VIN ─│ 5        10 │─ EN
     L2 ─│ 6         9 │─ PGND
   PGND ─│ 7         8 │─ VOUT
        └─────────────┘

Pin	Name	Description
1	`VINA`	Supply input for internal control logic
2	`GND`	Control logic ground reference
3	`FB`	Voltage feedback sense input ( $500\text{mV}$ internal reference)
4	`L1`	Inductor switch node 1 (input side)
5	`VIN`	High-current power stage input (+1.8V to +5.5V)
6	`L2`	Inductor switch node 2 (output side)
7, 9	`PGND`	Power stage ground pins (connected to thermal pad)
8, 14	`VOUT`	High-current power stage output pins
10	`EN`	Enable pin (>1.2V = Enabled, <0.4V = Disabled)
11	`PS`/`SYNC`	Power Save mode / clock sync pin (GND = Power Save enable, VINA = PWM)
12	`PG`	Open-drain Power-Good output indicator
13	`FB`	Feedback connection

Specifications

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Input Supply Voltage	$V_{IN}$	1.8	3.7	5.5	V	Operational input range
Feedback Reference Voltage	$V_{FB}$	492	500	508	mV	$T_A = 25^\circ\text{C}$
Buck Continuous Output Current	$I_{OUT\_BUCK}$	3000	—	—	mA	$V_{IN} = 3.6\text{V} \dots 5.5\text{V}, V_{OUT} = 3.3\text{V}$
Boost Continuous Output Current	$I_{OUT\_BOOST}$	2000	—	—	mA	$V_{IN} = 2.4\text{V}, V_{OUT} = 3.3\text{V}$
Switch Current Limit	$I_{CL}$	4000	4500	5500	mA	Peak switch current limit
Switching Frequency	$f_{SW}$	2.0	2.4	2.8	MHz	Internal oscillator
Quiescent Current	$I_Q$	—	35	50	$\mu\text{A}$	Power Save mode active

Typical Application Circuit (High-Current 3.3V Rail)

text

       +V_IN (1.8V - 5.5V High-Current Input)
          │
       [Pin 5: VIN] ── [Pin 4: L1] ─── [ 1.0µH - 1.5µH Inductor ] ─── [Pin 6: L2] ─── TPS63020 ─── [Pin 8/14: VOUT] ─── +3.3V (3A) Output
          │                                                                                             │
       [Pin 7/9: PGND]                                                                               [ R1 ]
          │                                                                                             │
         GND ───────────────────────────────────────────────────────────────────────────────────────────┴─── [Pin 3/13: FB]
                                                                                                        │
                                                                                                      [ R2 ]
                                                                                                        │
                                                                                                       GND

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

Common mistakes

Undersized PCB thermal layout for 3A output: Delivering 3A continuous output creates localized heat. Solder the central thermal pad (EP) to multiple PCB ground copper planes with thermal vias.
Using high-DCR inductors: High DC resistance (DCR) in the inductor reduces efficiency significantly at 3A output. Select shielded inductors with $\text{DCR} < 15\ \text{m}\Omega$ and $I_{SAT} > 4.5\text{ A}$ .

Notes

TPS63020 vs TPS63000: The TPS63020 features 4.0A internal switches (vs 2.0A for TPS63000) and operates at $2.4\text{ MHz}$ (vs $1.5\text{ MHz}$ ), tripling continuous output current capacity.

Interface	DC Input, DC Output, Dual Switch Nodes L1 & L2
Package	VSON-14 (DSJ / 3 x 4 mm)