SLUS912A August   2009  – August 2015

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Input Overvoltage Protection
      2. 7.3.2 Input Overcurrent Protection
      3. 7.3.3 Battery Overvoltage Protection
      4. 7.3.4 Thermal Protection
      5. 7.3.5 Enable Function
      6. 7.3.6 Fault Indication
    4. 7.4 Device Functional Modes
      1. 7.4.1 OPERATION Mode
      2. 7.4.2 POWER-DOWN Mode
      3. 7.4.3 POWER-ON RESET Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Powering Accessories
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Selection Of RBAT
        2. 8.2.2.2 Selection Of RCE, RFAULT, And RPU
        3. 8.2.2.3 Selection Of Input And Output Bypass Capacitors
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
VI Input voltage IN (with respect to VSS) –0.3 30 V
OUT (with respect to VSS) –0.3 12
ILIM, FAULT, CE, VBAT (with respect to VSS) –0.3 7
II Input current IN –1.8(2) 2 A
IO Output current OUT 2 A
Output sink current FAULT 15 mA
TJ Junction temperature –40 150 °C
Tstg Storage temperature –65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Negative current is specified for a maximum of 50 hours at TJ = 175°C.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
Charged device model (CDM), per JEDEC specification JESD22-C101(2) ±500
IN(IEC 61000-4-2)(3) Air Discharge ±15000
Contact ±8000
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
(3) With IN bypassed to the VSS with a 1-μF low-ESR ceramic capacitor

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
VIN Input voltage range 3 30 V
IIN Input current, IN pin 1.5 A
IOUT Output current, OUT pin 1.5 A
RILIM OCP Programming resistor 15 90 kΩ
TJ Junction temperature –40 125 °C

6.4 Thermal Information

THERMAL METRIC(1) bq24312 UNIT
DSG (WSON)
8 PINS
RθJA Junction-to-ambient thermal resistance 64 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 84.1 °C/W
RθJB Junction-to-board thermal resistance 33.9 °C/W
ψJT Junction-to-top characterization parameter 1.9 °C/W
ψJB Junction-to-board characterization parameter 34.3 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 5.6 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics

over junction temperature range –40°C to +125°C and recommended supply voltage (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
IN
UVLO Undervoltage lock-out, input power detected threshold CE = Low, VIN increasing from 0 V to 3 V 2.6 2.7 2.8 V
Vhys(UVLO) Hysteresis on UVLO CE = Low, VIN decreasing from 3 V to 0 V 200 260 300 mV
TDGL(PGOOD) Deglitch time, input power detected status CE = Low. Time measured from VIN 0 V → 5 V 1 μs rise-time, to output turning ON 8 ms
IDD Operating current CE = Low, No load on OUT pin,
VIN = 5 V, RILIM = 24.9 kΩ		 400 600 μA
ISTDBY Standby current CE = High, VIN = 5 V 65 95 μA
INPUT TO OUTPUT CHARACTERISTICS
VDO Drop-out voltage IN to OUT CE = Low, VIN = 5 V, IOUT = 1 A 170 280 mV
INPUT OVERVOLTAGE PROTECTION
VOVP Input overvoltage protection threshold CE = Low, VIN increasing from 5 V to 7.5 V 5.71 5.85 6.00 V
Vhys(OVP) Hysteresis on OVP CE = Low, VIN decreasing from 7.5 V to 5 V 20 60 110 mV
tBLANK(OVP) Blanking time on OVP CE = Low, Time measured from
VIN 5 V → 7.5 V, 1 μs fall-time to output turning OFF		 64 μs
tON(OVP) Recovery time from input overvoltage condition CE = Low, Time measured from
VIN 7.5 V → 5 V, 1 μs fall-time		 8 ms
INPUT OVERCURRENT PROTECTION
IOCP Input overcurrent protection threshold range 300 1500 mA
IOCP Input overcurrent protection threshold CE = Low, RILIM = 24.9 kΩ,
3 V ≤ VIN < VOVP – Vhys(OVP)		 900 1000 1100 mA
KILIM Programmable current limit factor 25 AkΩ
tBLANK(OCP) Blanking time, input overcurrent detected 176 μs
tREC(OCP) Recovery time from input overcurrent condition 64 ms
BATTERY OVERVOLTAGE PROTECTION
BVOVP Battery overvoltage protection threshold CE = Low, VIN > 4.4 V 4.30 4.35 4.4 V
Vhys(Bovp) Hysteresis on BVOVP CE = Low, VIN > 4.4 V 200 275 320 mV
IVBAT Input bias current on VBAT pin VBAT = 4.4 V, TJ = 25°C 10 nA
TDGL(Bovp) Deglitch time, battery overvoltage detected CE = Low, VIN > 4.4 V. Time measured from VVBAT rising from 4.1 V to 4.4 V to FAULT going low. 176 μs
THERMAL PROTECTION
TJ(OFF) Thermal shutdown temperature 140 150 °C
TJ(OFF-HYS) Thermal shutdown hysteresis 20 °C
LOGIC LEVELS ON CE
VIL Low-level input voltage 0 0.4 V
VIH High-level input voltage 1.4 V
IIL Low-level input current VCE = 0 V 1 μA
IIH High-level input current VCE = 1.8 V 15 μA
LOGIC LEVELS ON FAULT
VOL Output low voltage ISINK = 5 mA 0.2 V
IHI-Z Leakage current, FAULT pin HI-Z VFAULT = 5 V 10 μA

6.6 Typical Characteristics

Test conditions (unless otherwise noted) for typical operating performance: VIN = 5 V, CIN = 1 μF, COUT = 1 μF, RILIM = 24.9 kΩ, RBAT = 100 kΩ, TA = 25°C, VPU = 3.3 V (see Figure 12 for the Typical Application Circuit)
bq24312 vuvlo_ta_lus763.gifFigure 1. Undervoltage Lockout vs Free-Air Temperature
bq24312 vovp2_ta_lus763.gifFigure 3. Overvoltage Threshold Protection vs Free-Air Temperature
bq24312 iocp_ta_lus763.gifFigure 5. Input Overcurrent Protection vs Free-Air Temperature
bq24312 ivbat_ta_lus763.gifFigure 7. Leakage Current (VBAT Pin) vs Free-Air Temperature
bq24312 vdo_ta_lus763.gifFigure 2. Dropout Voltage (IN to OUT) vs Free-Air Temperature
bq24312 iocp_rilm_lus763.gifFigure 4. Input Overcurrent Protection vs ILIM Resistance
bq24312 bvop_ta_lus763.gifFigure 6. Battery Overvoltage Protection vs Free-Air Temperature
bq24312 idd_vin_lus763.gifFigure 8. Supply Current vs INPUT Voltage