IC1 Detailed Explanation

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IC1
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Purpose & Key Functions
  • Integrated Li-Ion linear charger and dynamic power-path manager for single-cell systems.
  • Powers the system load while independently charging the battery (Dynamic Power-Path Management, DPPM).
  • Reduces battery charge/discharge cycles, enables “instant-on” even with a discharged or absent battery.
  • Automatically shares input current between battery charging and system supply, preventing adapter or USB port overload.
  • Monitors battery temperature via TS pin (external NTC thermistor) to ensure safe charging.
Notable Characteristics
  • Charge Current Set (ISET pin): Program with a single resistor to VSS for up to 1 A charge.
  • Input Current Limit (ILIM pin): Sets maximum adapter or USB input current via resistor.
  • Status Outputs:
    • CHG (open-drain) indicates charging in progress.
    • PGOOD (open-drain) signals when SYS output is within regulation.
  • Thermal Regulation: On-chip thermal fold-back prevents overheating under high ambient or heavy load.
  • Under-Voltage Lockout (UVLO): Ensures reliable startup; IN thresholds track USB-IF requirements.
  • Fixed Regulated SYS Output: 4.4 V typical (VO(REG)) to power system rails.
Operation in a Circuit
  1. Adapter Plug-in: IN pin senses external power (USB or DC adapter).
  2. DPPM Control:
    • If system load + charge current < input limit, full programmed charge current flows.
    • If load + charge > input limit, charge current is reduced to maintain system voltage.
  3. SYS Output: Always regulated to VO(REG), powering downstream circuitry.
  4. Battery Charging: Independent current-limited, three-phase linear charge (pre-charge, fast charge, termination) with safety timer.
  5. Thermistor Monitoring (TS): Suspends charge if battery temperature is outside safe window.
Common Applications
  • Portable and handheld devices (smart sensors, wearables)
  • USB-powered battery-backed systems
  • “Always-on” embedded electronics requiring seamless battery backup
Family & Variations
The BQ2407x series comprises five pin-compatible devices:

Table

ModelSYS Output BehaviorSpecial FeaturesTypical Use Case
BQ24072RGTTVO(REG) = BAT + 200 mV clampAdjustable SYS above BATSystems requiring minimal SYS-BAT delta
BQ24073RGTTFixed VO(REG)Standard DPPMGeneral purpose single-cell chargers
BQ24075RGTTFixed VO(REG)Low quiescent current (standby ~35 µA)Battery-backed “always-on” applications
BQ24074RGTTFixed VO(REG)Functional-safety capable (IEC 61508)Safety-critical and industrial systems
BQ24079RGTTFixed VO(REG)Standby current < 1 µAUltra low-power, energy-harvesting devices
  • Key Differences:
    • Output clamp behavior (fixed vs. BAT+200 mV).
    • Standby/quiescent current levels for battery life optimization.
    • Functional safety certifications on select models.
  • Typical Selection Guidance:
    • Choose BQ24075 for low-power portable devices needing “instant on” and efficient standby.
    • Use BQ24074 where IEC-compliance and safety diagnostics are required.
    • Select BQ24072 if system rails must follow battery voltage with minimal offset.
All BQ2407x devices share the same 16-pin VQFN package and pinout, simplifying design reuse across variants.
Calculate ISET resistor
Decoupling cap values
NTC thermistor selection
Layout guideline check
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+5V5
+5V5
+5V5
EN2
ISET
CE
GND
R1
Resistance
1k Ω
R3
Resistance
10k Ω
+5V5
+5V5
+5V5
PGOOD
R2
Resistance
1k Ω
VBAT
C3
Capacitance
4.7u F
LED1
VBAT
VIN
IC1
VBAT
TS
TS
LED2
PGOOD
ILIM
EN1
CHG
TMR
C1
Capacitance
4.7u F
VBAT
+5V5
GND
CHG
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
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    Net Portal
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    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
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  • Generic Inductor
    Generic Inductor
    A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
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    15.1k
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    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
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    RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
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  • 875105359001
    875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
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    CTL1206FYW1T
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BQ24075 Module

BQ24075 Module
Description

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Last updated by vasy_skral
1 Contributor(s)
vasy_skral

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Designator Prefix

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