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PDF MC33348 Data sheet ( Hoja de datos )
| Número de pieza | MC33348 | |
| Descripción | LITHIUM BATTERY PROTECTION CIRCUIT FOR ONE CELL SMART BATTERY PACKS | |
| Fabricantes | Motorola Semiconductors | |
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Advance Information
Lithium Battery Protection
Circuit for One Cell
Battery Packs
The MC33348 is a monolithic lithium battery protection circuit that is
designed to enhance the useful operating life of a one cell rechargeable
battery pack. Cell protection features consist of internally trimmed charge
and discharge voltage limits, discharge current limit detection with a
delayed shutdown, and a virtually zero current sleepmode state when the
cell is discharged. An additional feature includes an on–chip charge pump
for reduced MOSFET losses while charging or discharging a low cell
voltage battery pack. This protection circuit requires a minimum number of
external components and is targeted for inclusion within the battery pack.
This MC33348 is available in standard SOIC 8 lead surface mount
package.
• Internally Trimmed Charge and Discharge Voltage Limits
• Discharge Current Limit Detection with Delayed Shutdown
• Virtually Zero Current Sleepmode State when Cells are Discharged
• Charge Pump for Reduced Losses with a Low Cell Voltage Battery Pack
• Dedicated for One Cell Applications
• Minimum Components for Inclusion within the Battery Pack
• Available in a Low Profile Surface Mount Package
Ordering Information shown on following page.
Typical One Cell Smart Battery Pack
MC33348
LITHIUM BATTERY
PROTECTION CIRCUIT
FOR
ONE CELL
SMART BATTERY PACKS
SEMICONDUCTOR
TECHNICAL DATA
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
Cell
Voltage
1
7 VCC
MC33348
Ground
3
Test
2
Charge Pump 8 Discharge 4 Charge 6
Output
Gate Drive
Gate Drive
Output
Output
5 Charge
Gate Drive
Common/
Discharge
Current Limit
PIN CONNECTIONS
Cell Voltage 1
8 Charge Pump
Output
Test 2
7 VCC
Ground 3
6
Charge Gate
Drive Output
Discharge Gate
Drive Output
45
(Top View)
Charge Gate Drive
Common/Discharge
Current Limit
This device contains 1170 active transistors.
This document contains information on a new product. Specifications and information herein
arMe OsuTbjOecRt tOo cLhAangAeNwAithLoOut GnotIiCce.DEVICE DATA
© Motorola, Inc. 1997
Rev 1
1
1 page  
MC33348
PROTECTION CIRCUIT OPERATING MODE TABLE
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁInput Conditions
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁCellStatus
Circuit Operation
Battery Pack Status
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCELL CHARGING/DISCHARGING
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁStorage or Nominal Operation: Both Charge MOSFET Q1 and Discharge MOSFET Q2 are on.
No current or voltage faults
The battery pack is available for charging or discharging.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCELL CHARGING FAULT/RESET
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCharge Voltage Limit Fault:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin 1 ≥ Vth(OV) for 1.0 s
Charge MOSFET Q1 is latched off and the cell is disconnected
from the charging source. An internal current source pull–up is
applied to divider resistors R1 and R2 creating a hysteresis
voltage of VH. The battery pack is available for discharging.
Discharge current limit protection is disabled.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCharge Voltage Limit Reset:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin 1 < (Vth(OV) – VH)
ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁfor 1.0 s
Charge MOSFET Q1 will turn on when the voltage across the cell
falls sufficiently to overcome hysteresis voltage VH. This can be
accomplished by applying a load to the battery pack. Discharge
current limit protection is enabled.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCELL DISCHARGING FAULT/RESET
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁDischarge Current Limit Fault:
VPin 5 ≥ (VPin 3 + Vth(dschg))
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁfor 3.0 ms and
ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin 1 < (Vth(OV) – VH)
for 1.0 ms
Discharge MOSFET Q2 is latched off and the cell is
disconnected from the load. Q2 will remain in the off state as long
as VPin 5 exceeds VPin 3 by ≈ Vth(dschg). The battery pack is
available for charging.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁDischarge Current Limit Reset:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin 5 – VPin 3 < Vth(dschg)
The Sense Enable circuit will reset and turn on discharge
MOSFET Q2 when VPin 3 no longer exceeds VPin 5 by
≈ Vth(dschg). This can be accomplished by either disconnecting
the load from the battery pack, or by connecting the battery pack
to the charger.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁDischarge VoltageLimitFault:
VPin 1 ≤ Vth(UV) for three
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁconsecutive 1.0 s samples
Discharge MOSFET Q2 is latched off, the cells are disconnected
from the load, and the protection circuit enters a low current
sleepmode state. The battery pack is available for charging.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁDischarge VoltageLimitReset:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin 3 > (VPin 5 + 0.6 V)
The Sense Enable circuit will reset and turn on discharge
MOSFET Q2 when VPin 3 exceeds VPin 5 by 0.6 V. This can be
accomplished by connecting the battery pack to the charger.
ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁFAULTY CELL
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁDischarge VoltageLimitFault:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin 1 ≤ 1.5 V
This condition can happen if the cell is defective (<1.5 V). The
protection circuit logic will not function and the battery pack
cannot be charged.
Outputs
MOSFET Switches Function
Charge Discharge Charge
Q1 Q2 Pump
On On Active
On to Off
On
Active
Off to On
On
Active
On On to Off Active
On Off to On Active
On On to Off Disabled
On Off to On Active
Disabled Disabled Disabled
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page 
MC33348
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
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and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.
MOTOROLA ANALOG IC DEVICE DATA
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MC33348.PDF ] | |
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