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PDF MC33349 Data sheet ( Hoja de datos )
| Número de pieza | MC33349 | |
| Descripción | LITHIUM BATTERY PROTECTION CIRCUIT FOR ONE CELL SMART BATTERY PACKS | |
| Fabricantes | Motorola Semiconductors | |
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Lithium Battery Protection
Circuit for One Cell
Battery Packs
The MC33349 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, charge and discharge current limit detection,
and a virtually zero current sleepmode state when the cell is discharged.
This protection circuit requires a minimum number of external components
and is targeted for inclusion within the battery pack. This MC33349 is
available in the SOT–23 6 lead surface mount package.
• Internally Trimmed Charge and Discharge Voltage Limits
• Charge and Discharge Current Limit Detection
• Virtually Zero Current Sleepmode State when Cells are Discharged
• 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.
MC33349
LITHIUM BATTERY
PROTECTION CIRCUIT
FOR
ONE CELL
SMART BATTERY PACKS
SEMICONDUCTOR
TECHNICAL DATA
6
1
Typical One Cell Smart Battery Pack
N SUFFIX
PLASTIC PACKAGE
CASE 1262
(SOT–23)
0.1 µF
100 Ω
5
6
0.01 µF 4
0.1 µF
MC33349
1 32
1.0 kΩ
PIN CONNECTIONS
DO 1
6 Gnd
P– 2
CO 3
5 Vcell
4 Ct
(Top View)
This device contains 264 active transistors.
This document contains information on a product under development. Motorola reserves the
rigMhtOtoTcOhaRnOgeLoAr dAiscNonAtiLnuOeGthisICproDdEucVt IwCitEhoDutAnoTtAice.
© Motorola, Inc. 1998
Rev 0
1
1 page  
MC33349
PROTECTION CIRCUIT OPERATING MODE TABLE
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁInput Conditions
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁCellStatus
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCELL CHARGING/DISCHARGING
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁStorage or Nominal Operation:
No current or voltage faults
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCELL CHARGING FAULT/RESET
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCharge Voltage Limit Fault:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin5≥Vth(OV)fortwoconsecutive
samples
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCharge Voltage Limit Reset:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin 5 < (Vth(OV) – VH)
for one sample, or
ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin 2 > Vth(dschg)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCharge Current Limit Fault:
Circuit Operation
Battery Pack Status
Both Charge MOSFET Q1 and Discharge MOSFET Q2 are on. The
battery pack is available for charging or discharging.
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.
Charge MOSFET Q1 will turn on when the voltage across the cell falls
sufficiently to overcome hysteresis voltage VH, or when a load is
applied to the battery pack.
Charge MOSFET Q1 is latched off and the cell is disconnected from
Outputs
MOSFET Switches
Charge Discharge
Q1 Q2
On On
On to Off
On
Off to On
On
On to Off
On
VPin 2 ≤ (VPin 6 + Vth(chg))
the charger. Q1 will remain in the off state as long as VPin 6 exceeds
VPin 2 by ≈ Vth(chg). The battery pack is available for discharging.
Discharge current limit is disabled.
Charge Current Limit Reset:
The Sense Enable circuit will reset and turn on charge MOSFET Q1
Off to On
On
VPin 6 – VPin 2 < Vth(chg)
when VPin 6 no longer exceeds VPin 2 by ≈ Vth(chg). This can be
accomplished by either disconnecting the charger from the battery
pack, or by connecting the battery pack to a load.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCELL DISCHARGING FAULT/RESET
Discharge Current Limit Fault:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin 2 ≥ (VPin 6 + Vth(dschg))
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 2 exceeds VPin 6
by ≈ Vth(dschg). The battery pack is available for charging. Charge
current limit protection is disabled.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁDischarge Current Limit Reset:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin 2 – VPin 6 < Vth(dschg)
The Sense Enable circuit will reset and turn on discharge MOSFET Q2
when VPin 2 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:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin 5 ≤ Vth(UV) for one sample
Discharge MOSFET Q2 is latched off, the cell is disconnected from the
load, and the protection circuit enters a low current sleepmode state.
The battery pack is available for charging. Charge current limit
protection is disabled.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁDischarge VoltageLimitReset:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin 6 > (VPin 2 + 0.6 V)
The Sense Enable circuit will reset and turn on discharge MOSFET Q2
when VPin 6 exceeds VPin 2 by 0.6 V. This can be accomplished by
connecting the battery pack to the charger.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁTEST MODE – PIN 4/PIN 5 SHORT
On
On
On
On
On to Off
Off to On
On to Off
Off to On
Continuous Charge Voltage Limit
This condition occurs if Pin 4 and Pin 5 are accidently shorted together
Comparator
or purposely connected for rapid Charge Voltgae Limit Testing.
VPin 4 = VPin 5 = Vcell < Vth(chg) MOSFET Q1 On to Off is not delayed and no hysteresis is required for
On
On
VPin 4 = VPin 5 = Vcell > Vth(chg)
FAULTY CELL
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁDischarge VoltageLimitFault:
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVPin 5 ≤ 1.5 V
reset.
This condition can happen if the cell is defective (<1.5 V) or if a
momentary discharge current causes the cell voltage to fall below
Vth(UV) before a sample is taken.
Off On
Off Off
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MC33349.PDF ] | |
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