IC1 Detailed Explanation

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IC1
IC1: IC1
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
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    Ground
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    Generic Resistor
    A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibrary
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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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    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
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    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
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  • 875105359001
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BQ24075 Module thumbnail
This project is a reference design based on the BQ24075RGTT, a single cell Li-Ion battery charger. It manages the power between an external power source (VIN), a Li-Ion battery (BAT), and a system power rail (SYS). Key features include power-path management, battery thermistor monitoring, and charge status indication. #Module #BQ24075 #ReferenceDesign #charger #BatteryManagement #reusable #module #bms #texas-instruments #sublayout

Properties

Pricing & Availability

Distributor

Qty 1

Digi-Key

$1.90–$2.95

LCSC

$3.03

Mouser

$2.67

Assets

BQ24075 Module-removebg-preview.png

BQ24075 Module-removebg-preview.png

BQ24075 Module-removebg-previewThumbnail

Controls