TPS61021ADSGR

Synchronous Boost Converter

The TPS61021ADSGR is a synchronous boost converter from Texas Instruments. View the full TPS61021ADSGR datasheet below including key specifications, pinout, electrical characteristics, absolute maximum ratings.

Manufacturer

Texas Instruments

Key Specifications

Parameter	Value
Quiescent Current	17 μA (typical, from VOUT pin)
Maximum Efficiency	91% (at VIN=2.4V, VOUT=3.3V, IOUT=1.5A)
Package Dimensions	2.00mm x 2.00mm
Switching Frequency	2.0 MHz (typical, reduces to 1 MHz at VIN < 1.5V)
Output Voltage Range	1.8V to 4.0V
Supply Voltage Range	0.5V to 4.4V (operating), 0.9V (minimum for startup)
Maximum Output Current	1.5A (at VOUT=3.3V, VIN>1.8V)
Valley Switch Current Limit	3A (minimum)
Operating Junction Temperature Range	-40°C to 125°C
Output Over-Voltage Protection Threshold	4.35V (typical)

Overview

Part: TPS61021A — Texas Instruments

Type: Synchronous Boost Converter

Description: A 0.5–4.4 V input, 3 A synchronous boost converter with 2 MHz switching frequency, up to 91% efficiency, and 17 μA quiescent current, designed for portable and smart devices.

Operating Conditions:

Supply voltage: 0.5–4.4 V
Operating temperature: -40 to 125 °C
Output voltage setting range: 1.8–4.0 V
Effective inductance range: 0.2–1.3 μH

Absolute Maximum Ratings:

Max supply voltage (VIN, SW, VOUT): 4.6 V (DC), 4.8 V (10% duty cycle)
Max junction temperature: 150 °C
Max storage temperature: 150 °C

Key Specs:

Efficiency: Up to 91% (VIN = 2.4V, VOUT = 3.3V, IOUT = 1.5A)
Switching frequency: 2.0 MHz (VIN > 1.5V, PWM mode)
Quiescent current (VOUT pin): 17 μA (typ, no load, no switching, TJ up to 85°C)
Reference voltage at FB pin (PWM mode): 775 mV (min), 795 mV (typ), 815 mV (max)
Output over-voltage protection threshold: 4.15 V (min), 4.35 V (typ), 4.60 V (max)
High-side MOSFET on resistance: 51 mΩ (typ, VOUT = 3.3V)
Low-side MOSFET on resistance: 58 mΩ (typ, VOUT = 3.3V)
Valley current limit: 3.0 A (min), 4.3 A (typ) (VIN = 2.4V, VOUT = 3.3V)

Features:

Minimum input voltage at startup: 0.9V
Light load Pulse Frequency Modulation (PFM) operation
True input-to-output disconnection in shutdown
Output over-voltage protection
Output short-circuit protection
Thermal shutdown protection

Applications:

Battery-powered IoT devices
Gaming controls
Thermostats
Portable medical equipment
Supercapacitor backup systems

Package:

WSON (8) 2.00mm x 2.00mm

Pin Configuration

TPS61021ADSGR Pinout

Package: WSON-8 (2.00mm × 2.00mm)

Pin Number	Pin Name	Type	Description
1	AGND	P	Analog Ground
2	FB	I	Feedback (voltage divider input)
3	VOUT	O	Output Voltage
4	VOUT	O	Output Voltage
5	EN	I	Enable Control Input
6	SW	O	Switch Node (inductor connection)
7	SW	O	Switch Node (inductor connection)
8	VIN	P	Input Supply Voltage
—	PGND	P	Power Ground (Thermal Pad, center)

Notes

PGND (thermal pad): The center thermal pad is connected to power ground and should be soldered to a ground plane for thermal management.
Dual pins: SW (pins 6, 7) and VOUT (pins 3, 4) are duplicated for current distribution and reduced parasitic inductance.
Pin numbering follows standard WSON convention: pin 1 at top-left, numbering counterclockwise.

Electrical Characteristics

TJ = -40°C to 125°C, VIN = 2.4 V and VOUT = 3.3 V. Typical values are at T J = 25°C (unless otherwise noted)

PARAMETER	PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
POWER SUPPLY	POWER SUPPLY	POWER SUPPLY	POWER SUPPLY	POWER SUPPLY	POWER SUPPLY	POWER SUPPLY
V IN	Input voltage range		0.5		4.4	V
		V IN rising		0.8	0.9	V
V IN_UVLO	Under-voltage lockout threshold	V IN falling	0.28	0.4	0.5	V
I	Quiescent current into VIN pin	IC enabled, No load, No switching V IN = 1.8 V to 3.6 V, V FB = V REF + 0.1 V, T J up to 85°C			3.0	μA
Q	Quiescent current into VOUT pin	IC enabled, No load, No switching V OUT = 1.8 V to 4.0 V, V FB = V REF + 0.1 V, T J up to 85°C		17	30	μA
I SD	Shutdown current into VIN and SW pin	IC disabled, V IN = 1.8 V to 3.6 V, T J up to 85°C		0.5	3.0	μA
OUTPUT	OUTPUT	OUTPUT	OUTPUT	OUTPUT	OUTPUT	OUTPUT
V OUT	Output voltage setting range		1.8		4.0	V
		PWM mode	775	795	815	mV
V REF	Reference voltage at the FB pin	PFM mode		801		mV
V OVP	Output over-voltage protection threshold	V OUT rising	4.15	4.35	4.60	V
V OVP_HYS	Over-voltage protection hysteresis			0.1		V
I FB_LKG	Leakage current at FB pin				20	nA
I SW_LKG	Leakage current into SW pin	IC disabled, T J up to 85°C			3.0	μA
I VOUT_LKG	Leakage current into VOUT pin	IC disabled, V OUT = 4.0 V, T J up to 85°C		1	2	μA
POWER SWITCH	POWER SWITCH	POWER SWITCH	POWER SWITCH	POWER SWITCH	POWER SWITCH	POWER SWITCH
R DS(on)	High-side MOSFET on resistance	V OUT = 3.3 V		51		m Ω
	Low-side MOSFET on resistance	V OUT = 3.3 V		58		m Ω
f SW	Switching frequency	V IN = 2.4 V, V OUT = 3.3 V, PWM mode		2.0		MHZ
t OFF_min	Minimum off time			80	120	ns
I LIM_SW	Valley current limit	V IN = 2.4 V, V OUT = 3.3 V	3.0	4.3		A
LOGIC INTERFACE	LOGIC INTERFACE	LOGIC INTERFACE	LOGIC INTERFACE	LOGIC INTERFACE	LOGIC INTERFACE	LOGIC INTERFACE
V EN_H	EN Logic high threshold	V IN > 1.2 V V IN ≤ 1.2 V			0.84 0.7 x V IN	V V
V EN_L	EN Logic Low threshold	V IN > 1.2 V V IN ≤ 1.2 V	0.36 0.3 x VIN			V
PROTECTION	PROTECTION	PROTECTION	PROTECTION	PROTECTION	PROTECTION	PROTECTION
T SD	Thermal shutdown threshold	T J rising		150		°C
T SD_HYS	Thermal shutdown hysteresis	T J falling below T SD		20		°C

Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)

			MIN	MAX	UNIT
Voltage range at terminals	EN, FB	DC	-0.3	3.6	V
(2)	VIN, SW, VOUT	DC	-0.3	4.6	V
		10% duty cycle	-0.3	4.8	V
Operating junction temperature, T J			-40	150	°C
Storage temperature, T stg			-65	150	°C

Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

			MIN	NOM	MAX	UNIT
V IN	Input voltage range		0.5		4.4	V
V OUT	Output voltage setting range		1.8		4	V
L	Effective inductance range		0.2	0.47	1.3	μH
C IN	Effective input capacitance range		1	4.7		μF
C OUT	Effective output capacitance range	I OUT ≤ 0.3 A	3	10	200	μF
C OUT		I OUT > 0.3 A	10	20	200	μF
T J	Operating junction temperature		-40		125	°C

Thermal Information

THERMAL METRIC	(1)	TPS61021A DSG (WSON) 8 PINS	UNIT
R θ JA	Junction-to-ambient thermal resistance	71.1	°C/W
R θ JC(top)	Junction-to-case (top) thermal resistance	95.2	°C/W
R θ JB	Junction-to-board thermal resistance	41.6	°C/W
ψ JT	Junction-to-top characterization parameter	3.1	°C/W
ψ JB	Junction-to-board characterization parameter	42	°C/W
R θ JC(bot)	Junction-to-case (bottom) thermal resistance	13	°C/W

Typical Application

The TPS61021A is a synchronous boost converter designed to operate from an input voltage supply range between 0.5 V and 4.4 V with 3-A valley switch current limit. The TPS61021A typically operates at a quasiconstant 2-MHz frequency pulse width modulation (PWM) at moderate to heavy load currents when the input voltage is above 1.5 V. The switching frequency changes to 1-MHz gradually with the input voltage changing from 1.5 V to 1 V to get better efficiency and high step-up ratio. At light load currents, the TPS61021A converter operates in power-save mode with pulse frequency modulation (PFM) to achieve high efficiency over the entire load current range.

Ordering Information

MPN	Package	Temperature Range	Packing
TPS61021ADSGR	WSON (8)	-40°C to 125°C	Tape and Reel

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
TPS61021A	Texas Instruments	—
TPS61021ADSGT	Texas Instruments	—

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