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bq77PL157A4225

www.ti.com

SLUSA00B –MARCH 2010–REVISED APRIL 2012

Voltage Protection for 3-Series to 6-Series Cell Lithium-Ion/Polymer Batteries

Check for Samples: bq77PL157A4225

FEATURES

DESCRIPTION

• Single IC Li-Ion Protection for 3-Series to 6-

The bq77PL157 is a stackable overvoltage protection

Series Cells

device for 3, 4, 5 or 6 series cell Li-Ion battery packs.

• Stackable to Protect up to 18-Series Cells

This device incorporates a precise and accurate

• Programmable Detection Time Delay

overvoltage detection circuit with preconfigured

threshold limits. Additional features include the ability

• Low Power Consumption

to stack multiple parts to monitor up to 18 series

– Typical 2-µA to 2.5-µA Normal Mode

cells.

• Fixed 4.225 V Overvoltage Threshold

FUNCTION

• Highly Accurate: ±20-mV MAX, T

= 0°C to

Each series cell in a Li-Ion battery pack is compared

50°C

to an internal reference voltage. If one cell reaches

• Output Activation for Low Side FET

an overvoltage condition, the protection sequence

(Contact TI for Alternate Output Options:

begins. The bq77PL157 starts charging an external

High/Low-side Fuse or FET)

capacitor through the CD pin. When the CD pin

• Protected Output, Power, and Ground Pins for

voltage reaches 1.2 V, the OUT pin changes state

Added Safety and Reliability and the LVO pin becomes active.

• Permanent or Recoverable Fault Options

If multiple bq77PL157 devices are stacked, the LVIN

pin of the next-lower device receives the LVO pin

• 16-pin Small Outline Package

from the above device and similarly starts a

shortened delay timer before activating its OUT pin.

APPLICATIONS

(No additional isolation or level-shift circuitry is

• Primary or Secondary Level Voltage Protection

required.) The lowest bq77PL157 in the string is used

for Li-Ion Battery Packs for Use in:

to activate a power MOSFET located in the low side

of the power path.

– Power Tools

– UPS Systems

– E-Bikes, Scooters, and Small Mobility

Vehicles

– Medical Devices, Test Equipment, and

Industrial Products

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (18 pages)

PAGE 1
bq77PL157A4225 www.ti.com SLUSA00B – MARCH 2010 – REVISED APRIL 2012 Voltage Protection for 3-Series to 6-Series Cell Lithium-Ion/Polymer Batteries Check for Samples: bq77PL157A4225 FEATURES 1 • • • • • • • • • • Single IC Li-Ion Protection for 3-Series to 6Series Cells Stackable to Protect up to 18-Series Cells Programmable Detection Time Delay Low Power Consumption – Typical 2-µA to 2.5-µA Normal Mode Fixed 4.
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bq77PL157A4225 SLUSA00B – MARCH 2010 – REVISED APRIL 2012 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ORDERING INFORMATION VPROTECT 4.
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bq77PL157A4225 www.ti.com SLUSA00B – MARCH 2010 – REVISED APRIL 2012 FUNCTIONAL BLOCK DIAGRAMS RVDD LVIN R IN VDD PACK+ C VDD PCKP VC1 C IN R IN Level shifter VC2 C IN R IN VC3 x10 ICD = 0.2 µA (TYP) C IN R IN VC4 C IN R IN Timer Control VC5 OUT C IN R IN 0.2 µA (TYP) VC6 1.2V(TYP) Level shifter C IN GND PCKN CD CCD LVO PACKNMOS Figure 1.
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bq77PL157A4225 SLUSA00B – MARCH 2010 – REVISED APRIL 2012 www.ti.com RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) MIN TYP MAX UNIT Supply voltage VDD 4.
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bq77PL157A4225 www.ti.com SLUSA00B – MARCH 2010 – REVISED APRIL 2012 VPROTECT V PROTECT- Cell Voltage (VCn - VC(n-1), (VC6 - GND) 2.4 V I CH2 I DS1 1.2 V I CH1 I CH1 VTH I DS2 I DS2 CD Figure 2. CD charge Current and Discharge Current bq77PL157 OUTPUT PARAMETER VOUT OUT pin drive voltage TEST CONDITION MIN TYP VCn – VC(n + 1), (n =1 to 5), VC6 – GND = VPROTECT + 25 mV, VDD = VC1, IOUT = 0 to –0.
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bq77PL157A4225 SLUSA00B – MARCH 2010 – REVISED APRIL 2012 www.ti.com H VLVL LVIN 2.4 V IDSLV ICH2 1.2V IDS2 ICHLV CD Figure 3. CD Charge Current and Discharge Current I CC 1 16 I IN 2 VC1 15 I IN 3 VC2 14 I IN 4 VC3 VDD 13 I IN 5 VC4 PCKP 12 I IN 6 VC5 11 I IN 7 VC6 10 8 GND 9 Figure 4.
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bq77PL157A4225 www.ti.com SLUSA00B – MARCH 2010 – REVISED APRIL 2012 When the recovery option is selected, if all cell voltages fall below VPROTECT – VTH (threshold hysteresis), an internal current source begins to discharge capacitor CCD, also acting as a delay timer. If any cell voltage returns back above VPROTECT – VTH before VCD reaches VCD,TH1, the delay timer is reset and the OUT and LVO pins remains active (i.e. in the fault state). The CD pin is charged back to its maximum value VCD,TH2.
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bq77PL157A4225 SLUSA00B – MARCH 2010 – REVISED APRIL 2012 www.ti.com VPROTECT VPROTECT - VTH Cell Voltage (VCn - VC(n-1), VC6 – GND) 1.2V CD tD = (1.2V x CD) / ICH1 OUT LVO Figure 6. Timing for Overvoltage Sensing (Without Recovery Option – Permanent Latch) From Level Shift Input More than six cells can be monitored with multiple bq77PL157 devices by using the LVO and LVIN pins to cascade or stack multiple parts.
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bq77PL157A4225 www.ti.com SLUSA00B – MARCH 2010 – REVISED APRIL 2012 Cell Voltage (VCn - VC(n-1), VC6 – GND) VPROTECT H V LVL LVIN tDIA = (1.2V x CD) / IDSLV 2.4V 1.2V CD tDA = (1.2V x CD) / ICHLV OUT LVO Figure 7. LVIN to OUT and LVO Timing CELL CONNECTION SEQUENCE Unused VCx cell input pins should be connected to the most positive connected cell input pin as shown in the Battery Connection Diagrams section. VDD is connected through a resistor to the most-positive VCx pin of the cell stack.
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bq77PL157A4225 SLUSA00B – MARCH 2010 – REVISED APRIL 2012 www.ti.com BATTERY CONNECTION DIAGRAMS The following schematics indicate the cell connections for several battery configurations. Unused cell inputs should be connected together on the most positive end of the cell stack. (VC1 is the most positive input.) The PCKP and PCKN pins supply power to the output FET driver. PCKP is always connected to the most positive cell input of the device.
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bq77PL157A4225 www.ti.
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bq77PL157A4225 SLUSA00B – MARCH 2010 – REVISED APRIL 2012 www.ti.com REVISION HISTORY Changes from Original (March 2010) to Revision A • Page Changed the overvoltage detection hysteresis (VTH) minimum value of 100 mV to 150 mV ............................................... 4 Changes from Revision A (October 2011) to Revision B Page • Changed Features Item From: Fixed Overvoltage Thresholds Available From 3.75 V to 4.35 V in 25-mV Steps To: Fixed 4.225 V Overvoltage Threshold .......................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device BQ77PL157APWR-4225 Package Package Pins Type Drawing TSSOP PW 16 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2000 330.0 12.4 Pack Materials-Page 1 6.9 B0 (mm) K0 (mm) P1 (mm) 5.6 1.6 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ77PL157APWR-4225 TSSOP PW 16 2000 367.0 367.0 35.
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