buck converter. bq25570 Datasheet

bq25570 Datasheet PDF, Equivalent


Part Number

bq25570

Description

nano power boost charger and buck converter

Manufacture

etcTI

Total Page 30 Pages
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bq25570 Datasheet
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bq25570
SLUSBH2G – MARCH 2013 – REVISED MARCH 2019
bq25570 nano power boost charger and buck converter
for energy harvester powered applications
1 Features
1 Ultra Low Power DC-DC Boost Charger
– Cold-Start Voltage: VIN 600 mV
– Continuous Energy Harvesting From VIN as
low as 100 mV
– Input Voltage Regulation Prevents Collapsing
High Impedance Input Sources
– Full Operating Quiescent Current of 488 nA
(typical)
– Ship Mode with < 5 nA From Battery
• Energy Storage
– Energy can be Stored to Re-chargeable Li-ion
Batteries, Thin-film Batteries, Super-
capacitors, or Conventional Capacitors
• Battery Charging and Protection
– Internally Set Undervoltage Level
– User Programmable Overvoltage Levels
• Battery Good Output Flag
– Programmable Threshold and Hysteresis
– Warn Attached Microcontrollers of Pending
Loss of Power
– Can be Used to Enable or Disable System
Loads
• Programmable Step Down Regulated Output
(Buck)
– High Efficiency up to 93%
– Supports Peak Output Current up to 110 mA
(typical)
• Programmable Maximum Power Point Tracking
(MPPT)
– Provides Optimal Energy Extraction From a
Variety of Energy Harvesters including Solar
Panels, Thermal and Piezo Electric Generators
spacing
Typical Application Schematic
CSTOR
Solar +
Cell
-
L1
CIN
CREF
Host
VSTOR
GPIO1
GPIO2
GPIO3
VBAT
VOC_SAMP
LBOOST
VREF_SAMP
VSS
VIN_DC
MPPT
EN
VOUT_EN
VBAT_OK
CBYP
VSTOR
+
BAT
VBAT
Boost
Controller
Buck
Controller
Cold Start
Nano-Power
Management
LBUCK
VOUT
L2
COUT
VSS
bq25570
ROV2
ROK3
ROV1
ROK2
ROK1
ROUT2
ROUT1
System
Load
1
2 Applications
• Energy Harvesting
• Solar Chargers
• Thermal Electric Generator (TEG) Harvesting
• Wireless Sensor Networks (WSN)
• Low Power Wireless Monitoring
• Environmental Monitoring
• Bridge and Structural Health Monitoring (SHM)
• Smart Building Controls
• Portable and Wearable Health Devices
• Entertainment System Remote Controls
3 Description
The bq25570 device is specifically designed to
efficiently extract microwatts (µW) to milliwatts (mW)
of power generated from a variety of high output
impedance DC sources like photovoltaic (solar) or
thermal electric generators (TEG) without collapsing
those sources. The battery management features
ensure that a rechargeable battery is not overcharged
by this extracted power, with voltage boosted, or
depleted beyond safe limits by a system load. In
addition to the highly efficient boosting charger, the
bq25570 integrates a highly efficient, nano- power
buck converter for providing a second power rail to
systems such as wireless sensor networks (WSN)
which have stringent power and operational
demands. All the capabilities of bq25570 are packed
into a small foot-print 20-lead 3.5-mm x 3.5-mm QFN
package (RGR).
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq25570
VQFN (20)
3.50 mm × 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Charger Efficiency vs Input Voltage
100
90
80
70 IIN = 100 PA
60
50
40
30
20 VSTOR = 2.0 V
10 VSTOR = 3.0 V
VSTOR = 5.5 V
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
Input Voltage (V)
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

bq25570 Datasheet
bq25570
SLUSBH2G – MARCH 2013 – REVISED MARCH 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 4
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 6
6.5 Electrical Characteristics........................................... 6
6.6 Electrical Characteristics........................................... 8
6.7 Typical Characteristics .............................................. 9
7 Detailed Description ............................................ 13
7.1 Overview ................................................................. 13
7.2 Functional Block Diagram ....................................... 14
7.3 Feature Description................................................. 14
7.4 Device Functional Modes........................................ 17
8 Application and Implementation ........................ 22
8.1 Application Information............................................ 22
8.2 Typical Applications ................................................ 25
9 Power Supply Recommendations...................... 34
10 Layout................................................................... 34
10.1 Layout Guidelines ................................................. 34
10.2 Layout Example .................................................... 35
10.3 Thermal Considerations ........................................ 36
11 Device and Documentation Support ................. 37
11.1 Device Support...................................................... 37
11.2 Documentation Support ........................................ 37
11.3 Receiving Notification of Documentation Updates 37
11.4 Community Resources.......................................... 37
11.5 Trademarks ........................................................... 37
11.6 Electrostatic Discharge Caution ............................ 37
11.7 Glossary ................................................................ 37
12 Mechanical, Packaging, and Orderable
Information ........................................................... 37
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision F (December 2018) to Revision G
Page
• Changed From: "330 mV typical,.." To: "600 mV typical,.." in the second paragraph of the Overview section ................... 13
• Changed Figure 21 .............................................................................................................................................................. 16
• Changed From: "VIN(CS) = 330 mV typical." To: "VIN(CS) = 600 mV typical." in the last paragraph of the Cold-Start
Operation section.................................................................................................................................................................. 19
Changes from Revision E (March 2015) to Revision F
Page
• Changed Feature From: Cold-Start Voltage: VIN 330 mV (Typical) To: Cold-Start Voltage: VIN 600 mV ........................ 1
• Changed the RGR Package appearance ............................................................................................................................... 4
• Increased VIN(CS) From: TYP = 330 mV and MAX = 450 mV To: TYP = 600 mV and MAX = 700 mV in Electrical
Characteristics table ............................................................................................................................................................... 6
Changes from Revision D (December 2014) to Revision E
Page
• Changed the Test Condition for PIN(CS) in the Electrical Characteristics ............................................................................... 6
• Changed the values for PIN(CS) in the Electrical Characteristics From: TYP = 5 To: TYP = 15.............................................. 6
• Changed CBYP = 0.1 µF To: CBYP = 0.01 µF in Detailed Design Procedure .................................................................... 25
• Changed CBYP = 0.1 µF To: CBYP = 0.01 µF in Detailed Design Procedure .................................................................... 28
• Changed CBYP = 0.1 µF To: CBYP = 0.01 µF in Detailed Design Procedure .................................................................... 31
Changes from Revision C (December 2013) to Revision D
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section .................................................................................................. 1
2 Submit Documentation Feedback
Product Folder Links: bq25570
Copyright © 2013–2019, Texas Instruments Incorporated


Features Datasheet pdf Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity bq25570 SLUSBH2G – MARCH 2013 – REVISED MARCH 2019 bq25570 nano po wer boost charger and buck converter fo r energy harvester powered applications VRDIV VBAT_OV OK_PROG OK_HYST VOUT_SE T Efficiency (%) 1 Features •1 Ultra Low Power DC-DC Boost Charger – Cold -Start Voltage: VIN ≥ 600 mV – Cont inuous Energy Harvesting From VIN as lo w as 100 mV – Input Voltage Regulatio n Prevents Collapsing High Impedance In put Sources – Full Operating Quiescen t Current of 488 nA (typical) – Ship Mode with < 5 nA From Battery • Energ y Storage – Energy can be Stored to R e-chargeable Li-ion Batteries, Thin-fil m Batteries, Supercapacitors, or Conven tional Capacitors • Battery Charging and Protection – Internally Set Under voltage Level – User Programmable Ove rvoltage Levels • Battery Good Output Flag – Programmable Threshold and Hy steresis – Warn Attached Microcontrollers of Pending Loss of Power – Can be Used to Enable or D.
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