TPS62087

Synchronous Step-Down Converter

The TPS62087 is a synchronous step-down converter from Texas Instruments. View the full TPS62087 datasheet below including electrical characteristics, absolute maximum ratings.

Manufacturer

Texas Instruments

Overview

Part: TPS62085, TPS62086, TPS62087 — Texas Instruments

Type: Synchronous Step-Down Converter

Description: High-frequency synchronous step-down converters optimized for small solution size and high efficiency, featuring a 2.5-V to 6.0-V input voltage range, up to 3-A output current, and hiccup short-circuit protection.

Operating Conditions:

Supply voltage: 2.5–6.0 V
Operating temperature: -40 to 125 °C
Sink current at PG pin: 1 mA (max)

Absolute Maximum Ratings:

Max supply voltage: 7 V (VIN, FB, VOS, EN, PG pins)
Max junction temperature: 150 °C
Max storage temperature: 150 °C

Key Specs:

Quiescent current (no load, not switching): 17 μA (typ)
Shutdown current: 0.7 μA (typ)
Undervoltage lockout threshold (VIN falling): 2.2 V (typ)
Thermal shutdown threshold: 150 °C (typ)
Soft-start time: 0.8 ms (typ)
Feedback regulation voltage: 800 mV (typ, I OUT = 1A, V IN ≥ V OUT + 1 V, PWM mode)
High-side FET ON-resistance: 31 mΩ (typ, I SW = 500 mA)
Low-side FET ON-resistance: 23 mΩ (typ, I SW = 500 mA)
High-side FET switch current limit: 4.6 A (typ)
PWM switching frequency: 2.4 MHz (typ, I OUT = 1 A)

Features:

DCS-Control™ topology
Up to 95% efficiency
Hiccup short-circuit protection
Power save mode for light load efficiency
100% duty cycle for lowest dropout
0.8-V to V IN adjustable output voltage (TPS62085)
1.8-V and 3.3-V fixed output voltage (TPS62087, TPS62086)
Output discharge
Power good output
Thermal shutdown protection

Applications:

Battery-powered applications
Point-of-load
Processor supplies
Hard disk drives

Package:

VSON (7) (2.00 mm × 2.00 mm)

Features

DCS-Control ™ topology
Up to 95% efficiency
Hiccup short-circuit protection
Power save mode for light load efficiency
100% duty cycle for lowest dropout
2.5-V to 6.0-V input voltage range
17-μA operating quiescent current
0.8-V to V IN adjustable output voltage
1.8-V and 3.3-V fixed output voltage
Output discharge
Power good output
Thermal shutdown protection
Available in 2-mm × 2-mm VSON package
Create a custom design using the:
-TPS62085 WEBENCH ® Power Designer
-TPS62086 WEBENCH ® Power Designer
-TPS62087 WEBENCH ® Power Designer

Applications

Typical Application Schematic

Typical Application Schematic

Pin Configuration

Figure 6-1. RLT Package 7-Pin VSON Top View

Table 6-1. Pin Functions

PIN	PIN	I/O
NAME	NO.	I/O
EN	1	IN
FB	3	IN
GND	5
PG	2	OUT
SW	6	PWR
VIN	7	PWR
VOS	4	IN

Electrical Characteristics

TJ = -40 °C to 125 °C, and VIN = 3.6 V. Typical values are at T J = 25 °C, unless otherwise noted.

PARAMETER	PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
SUPPLY	SUPPLY	SUPPLY	SUPPLY	SUPPLY	SUPPLY	SUPPLY
V IN	Input voltage range		2.5		6	V
I Q	Quiescent current into VIN	No load, device not switching T J = -40 °C to 85 °C, V IN = 2.5 V to 5.5 V		17	25	μA
I SD	Shutdown current into VIN	EN = Low, T J = -40 °C to 85 °C, V IN = 2.5 V to 5.5 V		0.7	5	μA
V UVLO	Undervoltage lockout threshold	V IN falling	2.1	2.2	2.3	V
	Undervoltage lockout hysteresis	V IN rising		200		mV
T	Thermal shutdown threshold	T J rising		150		°C
JSD	Thermal shutdown hysteresis	T J falling		20		°C
LOGIC INTERFACE EN	LOGIC INTERFACE EN	LOGIC INTERFACE EN	LOGIC INTERFACE EN	LOGIC INTERFACE EN	LOGIC INTERFACE EN	LOGIC INTERFACE EN
V IH	High-level input voltage	V IN = 2.5 V to 6.0 V	1.0			V
V IL	Low-level input voltage	V IN = 2.5 V to 6.0 V			0.4	V
I EN,LKG	Input leakage current into EN pin	EN = High		0.01	0.16	μA
R PD	Pulldown resistance at EN pin	EN = Low		400		kΩ
SOFT START, POWER GOOD	SOFT START, POWER GOOD	SOFT START, POWER GOOD	SOFT START, POWER GOOD	SOFT START, POWER GOOD	SOFT START, POWER GOOD	SOFT START, POWER GOOD
t SS	Soft-start time	Time from EN high to 95% of V OUT nominal		0.8		ms
V PG	Power good threshold	V OUT rising, referenced to V OUT nominal V falling, referenced to V nominal	93% 88%	95% 90%	98% 93%
V PG,OL	Low-level output voltage	I sink = 1 mA			0.4	V
I PG,LKG	Input leakage current into PG pin	V PG = 5.0 V, T J = -40 °C to 85 °C		0.01	0.16	μA
I PG,LKG	Input leakage current into PG pin	V PG = 5.0 V		0.01	0.25	μA
OUTPUT	OUTPUT	OUTPUT	OUTPUT	OUTPUT	OUTPUT	OUTPUT
	Output voltage range, TPS62085		0.8		V IN	V
V OUT	Output voltage accuracy,	I OUT = 1 A, V IN ≥ V OUT + 1 V, PWM mode	-1.0%		1.0%
	TPS62086, TPS62087 (1)	I OUT = 0 A, V IN ≥ V OUT + 1 V, PSM mode	-1.0%		2.1%
V FB	Feedback regulation voltage (1) (2)	I OUT = 1A , V IN ≥ V OUT + 1 V, PWM mode	792	800	808	mV
I		I OUT = 0 A, V IN ≥ V OUT + 1 V, PSM mode	792	800	817	mV
FB,LKG R	Feedback input leakage current	V FB = 1 V		0.01	0.1	μA
DIS	Output discharge resistor Line regulation	EN = LOW, V OUT = 1.8 V I OUT = 1 A, V IN = 2.5 V to 6.0 V		260 0.02		Ω %/V
	Load regulation	I OUT = 0.5 A to 3 A		0.16		%/A
POWER SWITCH	POWER SWITCH	POWER SWITCH	POWER SWITCH	POWER SWITCH	POWER SWITCH	POWER SWITCH
R	High-side FET ON-resistance	I SW = 500 mA		31	56	mΩ
DS(on)	Low-side FET ON-resistance	I SW = 500 mA		23	45	mΩ
I LIM	High-side FET switch current limit		3.7	4.6	5.5	A
f SW	PWM switching frequency	I OUT = 1 A		2.4		MHz

Absolute Maximum Ratings

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

		MIN	MAX	UNIT
Voltage at Pins (2)	VIN, FB, VOS, EN, PG	-0.3	7	V
Voltage at Pins (2)	SW (DC)	-0.3	V IN + 0.3	V
	SW (AC, less than 100ns) (3)	-3	11	V
	Operating Junction, T J	-40	150	°C
	Storage, T stg	-65	150	°C

Recommended Operating Conditions

		MIN (1)	MAX (1)	UNIT
V IN	Input voltage range	2.5	6	V
I SINK_PG	Sink current at PG pin		1	mA
V PG	Pullup resistor voltage		6	V
T J	Operating junction temperature	-40	125	°C

Thermal Information

	THERMAL METRIC (1)	TPS6208x RLT [VSON]	UNIT
		7 PINS
R θJA	Junction-to-ambient thermal resistance	107.8	°C/W
R θJC(top)	Junction-to-case (top) thermal resistance	66.2	°C/W
R θJB	Junction-to-board thermal resistance	17.1	°C/W
ψ JT	Junction-to-top characterization parameter	2.1	°C/W
ψ JB	Junction-to-board characterization parameter	17.1	°C/W
R θJC(bot)	Junction-to-case (bottom) thermal resistance	N/A	°C/W

Typical Application

The TPS62085 is a synchronous step-down converter in which output voltage is adjusted by component selection. The following section discusses the design of the external components to complete the power supply design for several input and output voltage options by using typical applications as a reference. The TPS62086 and TPS62087 devices provide a fixed output voltage which does not need an external resistor divider.

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
TPS62085	Texas Instruments	VSON (7-Pin)
TPS62085RLT	Texas Instruments	VSON (7-Pin)
TPS62085RLTR	Texas Instruments	VSON-7 (2.00 mm x 2.00 mm)
TPS62085RLTT	Texas Instruments	—
TPS62086	Texas Instruments	—
TPS6208X	Texas Instruments	—

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