BQ25570
Micropower Boost Charger with Buck ConverterThe BQ25570 is a micropower boost charger with buck converter from Texas Instruments. View the full BQ25570 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
Manufacturer
Texas Instruments
Category
Micropower Boost Charger with Buck Converter
Key Specifications
| Parameter | Value |
|---|---|
| Applications | Energy Harvesting |
| Quiescent Current | 488nA |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 125°C |
| Package / Case | 20-VFQFN Exposed Pad |
| Packaging | MouseReel |
| Packaging | MouseReel |
| Standard Pack Qty | 3000 |
| Standard Pack Qty | 3000 |
| Supplier Device Package | 20-VQFN (3.5x3.5) |
| Supplier Device Package | 20-VQFN (3.5x3.5) |
| Supply Voltage | 0.12V ~ 4V |
Overview
Part: bq25570 — Texas Instruments
Type: Micropower Boost Charger with Buck Converter
Description: The bq25570 is an ultra-low-power DC/DC boost charger designed for energy harvesting applications, capable of continuous energy harvesting from input voltages as low as 100mV. It integrates battery charging and protection features, along with a high-efficiency, micropower buck converter supporting up to 110mA peak output current and up to 93% efficiency.
Operating Conditions:
- Supply voltage: VIN as low as 100mV (continuous harvesting)
- Cold Start Voltage: VIN ≥ 600mV
Absolute Maximum Ratings:
- Peak Input Power: 510 mW
Key Specs:
- Cold Start Voltage: VIN ≥ 600mV
- Continuous Energy Harvesting: VIN as low as 100mV
- Full Operating Quiescent Current: 488nA (Typical)
- Shipping Power-Save Mode Battery Current: < 5nA
- Buck Converter Efficiency: up to 93%
- Buck Converter Peak Output Current: 110mA (Typical)
Features:
- Ultra-Low-Power DC/DC Boost Charger
- Input Voltage Regulation Prevents Collapse of High-Impedance Input Sources
- Stores Energy into Rechargeable Li-Ion Batteries, Thin-Film Batteries, Super-Capacitors, or Conventional Capacitors
- Internally Set Undervoltage Level
- User Programmable Overvoltage Level
- Battery OK Output Flag with Programmable Threshold and Hysteresis
- Programmable Buck Regulated Output
- Programmable Maximum Power Point Tracking (MPPT)
Applications:
- Energy Harvesting
- Solar Chargers
- Thermoelectric Generator (TEG) Energy 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
Package:
- Very Thin Quad Flat No-Lead (VQFN) (20) - 3.50mm x 3.50mm
Features
- 1 · Ultra-Low-Power DC/DC Boost Charger
- -Cold Start Voltage: VIN ≥ 600mV
- -Continuous Energy Harvesting from VIN as Low as 100mV
- -Input Voltage Regulation Prevents Collapse of High-Impedance Input Sources
- -488nA (Typical) Full Operating Quiescent Current
- -Shipping Power-Save Mode with Battery Current < 5nA
Applications
- Energy Harvesting
- Solar Chargers
- Thermoelectric Generator (TEG) Energy 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
Pin Configuration
Pin Functions
Pin Functions
| PIN | PIN | I/O | DESCRIPTION |
|---|---|---|---|
| NAME | NO. | I/O | DESCRIPTION |
| EN | 5 | I | Active low digital programming input for enabling/disabling the IC. Connect to GND to enable the IC. |
| LBOOST | 20 | I/O | Inductor connection for the boost charger switching node. Connect a 22 μH inductor between this pin and pin 2 (VIN_DC). |
| LBUCK | 16 | I/O | Inductor connection for the buck converter switching node. Connect at least a 4.7 μH inductor between this pin and pin 14 (VOUT). |
| NC | 9 | I | Connect to ground using the IC's PowerPAD™. |
| NC | 17 | I | Connect to ground using the IC's PowerPAD. |
| OK_HYST | 10 | I | Connect to the mid-point of external resistor divider between VRDIV and GND for setting the VBAT_OK hystersis threshold. If not used, connect this pin to GND. |
| OK_PROG | 11 | I | Connect to the mid-point of external resistor divider between VRDIV and GND for setting the VBAT_OK threshold. If not used, connect this pin to GND. |
| VBAT | 18 | I/O | Connect a rechargeable storage element with at least 100μF of equivalent capacitance between this pin and either VSS pin. |
| VBAT_OK | 13 | O | Digital output for battery good indicator. Internally referenced to the VSTOR voltage. Leave floating if not used. |
| VBAT_OV | 7 | I | Connect to the mid-point of external resistor divider between VRDIV and GND for setting the VBAT overvoltage threshold. |
| VIN_DC | 2 | I | DC voltage input from energy harvesting source. Connect at least a 4.7 μF capacitor as close as possible between this pin and pin 1. |
| VOC_SAMP | 3 | I | Sampling pin for MPPT network. Connect to VSTOR to sample at 80% of input source open circuit voltage. Connect to GND for 50% or connect to the mid-point of external resistor divider between VIN_DC and GND. |
| VOUT | 14 | O | Buck converter output. Connect at least 22 μF output capacitor between this pin and pin 15 (VSS). |
| VOUT_EN | 6 | I | Active high digital programming input for enabling/disabling the buck converter. Connect to VSTOR to enable the buck converter. |
| VOUT_SET | 12 | I | Connect to the mid-point of external resistor divider between VRDIV and GND for setting the VOUT regulation set point. |
| VREF_SAMP | 4 | I | Connect a 0.01-μF low-leakage capacitor from this pin to GND to store the voltage to which VIN_DC will be regulated. This voltage is provided by the MPPT sample circuit. |
| VRDIV | 8 | O | Connect high side of resistor divider networks to this biasing voltage. |
| VSS | 1 | I | Power ground for the boost charger. |
| VSS | 15 | - | Power ground for the buck converter and analog/signal ground for the resistor dividers and VREF_SAMP capacitor. |
| VSTOR | 19 | O | Connection for the output of the boost charger. Connect at least a 4.7 μF capacitor in parallel with a 0.1 μF capacitor as close as possible to between this pin and pin 1 (VSS). |
Pin Functions
Electrical Characteristics
Over recommended temperature range, typical values are at TA = 25°C. Unless otherwise noted, specifications apply for conditions of VSTOR = 4.2 V, VOUT = 1.8 V. External components, CIN = 4.7 μF, L1 = 22 μH, CSTOR = 4.7 μF, L2 = 10 μH, COUT = 22 μF
| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|
| BOOST CHARGER | BOOST CHARGER | BOOST CHARGER | BOOST CHARGER | BOOST CHARGER | BOOST CHARGER | BOOST CHARGER |
| V IN(DC) | DC input voltage into VIN_DC | Cold-start completed | 100 | 5100 | mV | |
| I CHG(CBC_LIM) | Cycle-by-cycle current limit of charger | 0.5V < V IN < 4.0 V; VSTOR = 4.2 V | 230 | 285 | mA | |
| P IN | Input power range for normal charging | VBAT_OV > VSTOR > VSTOR_CHGEN | 0.005 | 510 | mW | |
| V IN(CS) | Minimum input voltage for cold start circuit to start charging VSTOR | VBAT < VBAT_UV; VSTOR = 0 V; 0°C < T A < 85°C | 600 | 700 | mV | |
| VSTOR (CHGEN) | Voltage on VSTOR when cold start operation ends and normal charger operation commences | 1.6 | 1.73 | 1.9 | V | |
| P IN(CS) | Minimum cold-start input power for VSTOR to reach VSTOR (CHGEN) and allow normal charging to commence | VSTOR < VSTOR (CHGEN) VIN_DC clamped to V IN(CS) by cold start circuit VBAT = 100 μF | 15 | μW | ||
| t BAT_HOT_PLUG | Time for which switch between VSTOR and VBAT closes when battery is hot plugged into VBAT | Battery resistance = 300 Ω , Battery voltage = 3.3V | 50 | ms | ||
| QUIESCENT CURRENTS | QUIESCENT CURRENTS | QUIESCENT CURRENTS | QUIESCENT CURRENTS | QUIESCENT CURRENTS | QUIESCENT CURRENTS | QUIESCENT CURRENTS |
| I Q | EN = 0, VOUT_EN = 1 - Full operating mode | VIN_DC = 0V; VSTOR = 2.1V; T J = 25°C | 488 | 700 | nA | |
| I Q | VIN_DC = 0V; VSTOR = 2.1V; -40°C < T J < 85°C | 900 | nA | |||
| I Q | EN = 0, VOUT_EN = 0 - Partial standby mode | VIN_DC = 0V; VSTOR = 2.1V; T J = 25°C | 445 | 615 | nA | |
| I Q | VIN_DC = 0V; VSTOR = 2.1V; -40°C < T J < 85°C | 815 | nA | |||
| I Q | EN = 1, VOUT_EN = x - Ship mode | VBAT = 2.1 V; T J = 25°C; VSTOR = VIN_DC = 0 V | 1 | 5 | nA | |
| I Q | VBAT = 2.1 V; -40°C < T J < 85°C; VSTOR = VIN_DC = 0 V | 30 | nA | |||
| MOSFET RESISTANCES | MOSFET RESISTANCES | MOSFET RESISTANCES | MOSFET RESISTANCES | MOSFET RESISTANCES | MOSFET RESISTANCES | MOSFET RESISTANCES |
| R DS(ON)-BAT | ON resistance of switch between VBAT and VSTOR | VBAT = 4.2 V | 0.95 | 1.50 | Ω |
Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Input voltage | VIN_DC, VOC_SAMP, VREF_SAMP, VBAT_OV, VRDIV, OK_HYST, OK_PROG, VBAT_OK, VBAT, VSTOR, LBOOST, EN, VOUT_EN, VOUT_SET, LBUCK, VOUT (2) | -0.3 | 5.5 | V |
| Peak Input Power, PIN_PK | Peak Input Power, PIN_PK | 510 | mW | |
| Operating junction temperature, T J | Operating junction temperature, T J | -40 | 125 | °C |
| Storage temperature, T stg | Storage temperature, T stg | -65 | 150 | °C |
Recommended Operating Conditions
| MIN | NOM | MAX | UNIT | ||
|---|---|---|---|---|---|
| VIN(DC) | DC input voltage into VIN_DC (1) | 0.1 | 5.1 | V | |
| VBAT, VOUT | Voltage range (2) | 2 | 5.5 | V | |
| CIN | Capacitance on VIN_DC pin | 4.7 | μF | ||
| CSTOR | Capacitance on VSTOR pin | 4.7 | μF | ||
| COUT | Capacitance on VOUT pin | 10 | 22 | μF | |
| CBAT | Capacitance or battery with at least the same equivalent capacitance on VBAT pin | 100 | μF | ||
| CREF | Capacitance on VREF_SAMP that stores the samped VIN reference | 9 | 10 | 11 | nF |
| R OC1 + R OC2 | Total resistance for setting for MPPT reference if needed | 18 | 20 | 22 | M Ω |
| R OK 1 + R OK 2 + R OK3 | Total resistance for setting VBAT_OK threshold voltage. | 11 | 13 | 15 | M Ω |
| R OUT1 + R OUT2 | Total resistance for setting VOUT threshold voltage. | 11 | 13 | 15 | M Ω |
| R OV1 + R OV2 | Total resistance for setting VBAT_OV voltage. | 11 | 13 | 15 | M Ω |
| L1 | Inductance on LBOOST pin | 22 | μH | ||
| L2 | Inductance on LBUCK pin | 4.7 | 10 | μH | |
| T A | Operating free air ambient temperature | -40 | 85 | °C | |
| T J | Operating junction temperature | -40 | 105 | °C |
Thermal Information
| THERMAL METRIC (1) | bq25570 RGR | UNIT | |
|---|---|---|---|
| 20 PINS | |||
| R θ JA | Junction-to-ambient thermal resistance | 34.6 | °C/W |
| R θ JC(top) | Junction-to-case (top) thermal resistance | 49.0 | °C/W |
| R θ JB | Junction-to-board thermal resistance | 12.5 | °C/W |
| ψ JT | Junction-to-top characterization parameter | 0.5 | °C/W |
| ψ JB | Junction-to-board characterization parameter | 12.6 | °C/W |
| R θ JC(bot) | Junction-to-case (bottom) thermal resistance | 1.0 | °C/W |
Typical Application
bq25570
ZHCSBK4G -MARCH 2013-REVISED MARCH 2019
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| BQ25570RGRR | Texas Instruments | 20-VFQFN Exposed Pad |
| BQ25570RGRT | Texas Instruments | 20-VFQFN Exposed Pad |
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