BQ25504RGRR

Part: BQ25504 (BQ25504RGRR) — Texas Instruments

Type: Ultra Low-Power Boost Converter / Battery Charger for Energy Harvesting

Description: Ultra low-power boost converter/charger with battery management for energy harvesters. It cold-starts from VIN ≥ 600 mV (typ), harvests down to VIN = 130 mV (typ), and has a quiescent current below 330 nA (typ).

Operating Conditions:

• DC input voltage (VIN_DC): 0.13–3 V (maximum input power ≤ 300 mW, after cold start)
• Battery voltage (VBAT): 2.5–5.25 V
• Operating ambient temperature: -40 to 85 °C
• Operating junction temperature: -40 to 105 °C
• Input inductance: 22 μH nominal (19.8–24.2 μH)

Absolute Maximum Ratings:

• Max input voltage (VIN_DC, VOC_SAMP, VREF_SAMP, VBAT_OV, VBAT_UV, VRDIV, OK_HYST, OK_PROG, VBAT_OK, VBAT, VSTOR, LBST): 5.5 V (min -0.3 V)
• Peak input power: 400 mW
• Operating junction temperature: -40 to 125 °C
• Storage temperature: -65 to 150 °C

Key Specs:

• Cold-start input voltage VIN(CS): 600 mV typical, 700 mV max
• Continuous harvesting down to VIN ≥ 130 mV (typ)
• Quiescent current IQ < 330 nA (typ)
• Recommended input and storage capacitance (CHVR, CSTOR): 4.7 μF nominal
• Recommended battery pin capacitance: ≥ 100 μF
• MPPT reference resistor total (ROC1 + ROC2): 20 MΩ nominal
• Undervoltage and overvoltage divider totals: 10 MΩ nominal each

Features:

• High-efficiency DC-DC boost converter/charger for low-input sources
• Programmable dynamic maximum power point tracking (MPPT)
• Input voltage regulation prevents collapsing the input source
• Stores energy in Li-ion batteries, thin-film batteries, super-capacitors, or conventional capacitors
• User-programmable battery undervoltage and overvoltage levels
• On-chip temperature sensor with programmable overtemperature shutoff
• Battery-good output (VBAT_OK) with programmable threshold and hysteresis, which can warn a microcontroller of pending power loss or enable/disable system loads

Applications:

• Energy harvesting
• Solar chargers
• Thermal electric generator (TEG) harvesting
• Wireless sensor networks
• Industrial monitoring
• Environmental monitoring
• Bridge and structural health monitoring
• Smart building controls
• Portable and wearable health devices
• Entertainment system remote controls

Package:

• VQFN (16), 3.00 mm × 3.00 mm (RGT)

• Ultra low-power with high-efficiency DC-DC boost converter/charger
• -Continuous energy harvesting from low-input sources: VIN ≥ 130 mV (Typical)
• -Ultra-low quiescent current: IQ < 330 nA (Typical)
• -Cold-start voltage: V IN ≥ 600 mV (typical)
• Programmable dynamic maximum power point tracking (MPPT)
• -Integrated dynamic maximum power point tracking for optimal energy extraction from a variety of energy generation sources
• -Input voltage regulation prevents collapsing input source
• Energy storage
• -Energy can be stored to rechargeable li-ion batteries, thin-film batteries, super-capacitors, or conventional capacitors
• Battery charging and protection
• -User Programmable undervoltage and overvoltage levels
• -On-chip temperature sensor with programmable overtemperature shutoff
• Battery status output
• -Battery good output pin
• -Programmable threshold and hysteresis
• -Warn attached microcontrollers of pending loss of power
• -Can be used to enable or disable system loads

• Energy harvesting
• Solar chargers
• Thermal electric generator (TEG) harvesting
• Wireless sensor networks (WSNs)
• Industrial monitoring
• Environmental monitoring
• Bridge and structural health monitoring (SHM)
• Smart building controls
• Portable and wearable health devices
• Entertainment system remote controls

Figure 6-1. RGT Package 16 Pins Top View

Table 6-1. Pin Functions

Over recommended temperature range, typical values are at TA = 25°C. Unless otherwise noted, specifications apply for conditions of VIN_DC = 1.2V, VBAT = VSTOR = 3V. External components LBST = 22 μH, CHVR = 4.7 μF CSTOR= 4.7 μF.

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

• (1) Maximum input power ≤ 300 mW. Cold start has been completed

(2) VBAT_OV setting must be higher than VIN_DC

• A. Place close as possible to IC pin 15 (VSTOR) and pin 13 (VSS)
• B. See the Capacitor Selection section for guidance on sizing CSTOR

Figure 9-1. Typical Solar Application Circuit