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bq77PL157 Datasheet Preview

bq77PL157 Datasheet

Voltage Protection

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www.ti.com
bq77PL157A4225
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 6-
Series 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 4.225 V Overvoltage Threshold
• Highly Accurate: ±20-mV MAX, TA = 0°C to
50°C
• Output Activation for Low Side FET
(Contact TI for Alternate Output Options:
High/Low-side Fuse or FET)
• Protected Output, Power, and Ground Pins for
Added Safety and Reliability
• Permanent or Recoverable Fault Options
• 16-pin Small Outline Package
APPLICATIONS
• Primary or Secondary Level Voltage Protection
for Li-Ion Battery Packs for Use in:
– Power Tools
– UPS Systems
– E-Bikes, Scooters, and Small Mobility
Vehicles
– Medical Devices, Test Equipment, and
Industrial Products
DESCRIPTION
The bq77PL157 is a stackable overvoltage protection
device for 3, 4, 5 or 6 series cell Li-Ion battery packs.
This device incorporates a precise and accurate
overvoltage detection circuit with preconfigured
threshold limits. Additional features include the ability
to stack multiple parts to monitor up to 18 series
cells.
FUNCTION
Each series cell in a Li-Ion battery pack is compared
to an internal reference voltage. If one cell reaches
an overvoltage condition, the protection sequence
begins. The bq77PL157 starts charging an external
capacitor through the CD pin. When the CD pin
voltage reaches 1.2 V, the OUT pin changes state
and the LVO pin becomes active.
If multiple bq77PL157 devices are stacked, the LVIN
pin of the next-lower device receives the LVO pin
from the above device and similarly starts a
shortened delay timer before activating its OUT pin.
(No additional isolation or level-shift circuitry is
required.) The lowest bq77PL157 in the string is used
to activate a power MOSFET located in the low side
of the power path.
1
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.
Copyright © 2010–2012, Texas Instruments Incorporated




etcTI

bq77PL157 Datasheet Preview

bq77PL157 Datasheet

Voltage Protection

No Preview Available !

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.
VPROTECT
4.225 V
DEVICE
bq77PL157A
ORDERING INFORMATION
FEATURE CONFIGURATION
Recoverable Output
PACKAGING
Tape and Reel
Tube
FULL PART NAME
bq77PL157APWR-4225
bq77PL157APW-4225
DEVICE INFORMATION
PIN NAME
CD
GND
LVIN
LVO
NC
OUT
PCKN
PCKP
VC1
VC2
VC3
VC4
VC5
VC6
VDD
PW PACKAGE
(TOP VIEW)
LVO 1
VC1 2
VC2 3
VC3 4
VC4 5
VC5 6
VC6 7
GND 8
16 LVIN
15 NC
bq77PL157
Low-Side
CHG FET
14 CD
13 VDD
12 PCKP
11 NC
10 OUT
9 PCKN
PIN NO.
14
8
16
1
11, 15
10
9
12
2
3
4
5
6
7
13
PIN FUNCTIONS
DESCRIPTION
External capacitor to GND to set delay time
Ground pin and negative end of cell stack
Level-shift input (used for stacking, input is from next-higher part)
Level-shift output (used for stacking, route this output to next-lower part)
No connection
Output gate drive to external MOSFET
Pack negative supply for OUT driver (connect to source of external MOSFET or GND if device not at
bottom of stack)
Pack positive supply for OUT driver (connect to most positive cell input of device)
Sense voltage input for most positive cell
Sense voltage input for second most positive cell
Sense voltage input for third most positive cell
Sense voltage input for fourth most positive cell
Sense voltage input for fifth most positive cell
Sense voltage input for least positive cell
Power supply (via RC filter)
2
Copyright © 2010–2012, Texas Instruments Incorporated



Part Number bq77PL157
Description Voltage Protection
Maker etcTI
Total Page 3 Pages
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