MC33349N-2 [MOTOROLA]
LITHIUM BATTERY PROTECTION CIRCUIT FOR ONE CELL SMART BATTERY PACKS; 锂电池保护电路是否一个单元格智能电池组
| 型号： | MC33349N-2 |
| 厂家： | 
MOTOROLA |
| 描述： | LITHIUM BATTERY PROTECTION CIRCUIT FOR ONE CELL SMART BATTERY PACKS |
| 文件： | 总8页 (文件大小：113K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Order this document by MC33349PP/D
LITHIUM BATTERY
PROTECTION CIRCUIT
FOR
ONE CELL
SMART 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.
SEMICONDUCTOR
TECHNICAL DATA
• 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.
6
1
N SUFFIX
PLASTIC PACKAGE
CASE 1262
(SOT–23)
Typical One Cell Smart Battery Pack
100
Ω
0.1 µF
5
PIN CONNECTIONS
MC33349
1
2
3
6
5
4
DO
P–
Gnd
V
6
4
cell
CO
C
t
0.01 µF
1
3
2
(Top View)
0.1 µF
1.0 k
Ω
This device contains 264 active transistors.
This document contains information on a product under development. Motorola reserves the
Motorola, Inc. 1998
Rev 0
right to change or discontinue this product without notice.
MC33349
ORDERING INFORMATION
Discharge
Charge
Charge
Current Limit
Threshold (mV) Temperature Range
Operating
Overvoltage
Threshold (V) Hysteresis (mV)
Overvoltage
Undervoltage
Threshold (V)
Device
Package
MC33349N–1
MC33349N–2
MC33349N–3
MC33349N–4
MC33349N–5
MC33349N–6
MC33349N–7
MC33349N–8
MC33349N–9
MC33349N–10
4.2
4.2
150
75
4.25
4.25
150
75
4.3
200
4.3
150
2.3
T
A
= –40 to 85°C
SOT–23
75
150
75
4.35
4.35
4.65
4.65
150
75
MAXIMUM RATINGS
Ratings
Symbol
Value
Unit
Input Voltage
V
IR
V
Discharge Gate Drive Output (Pin 1) to Gnd (Pin 6)
Charge Gate Drive Common/Current Limit (Pin 2) to V
(Pin 5)
5.0 to –1.0
1.0 to –18
cell
Charge Gate Drive Output (Pin 3) to V
cell
Overvoltage Delay Capacitor (Pin 4) to Gnd (Pin 6)
(Pin 5)
1.0 to –18
5.0 to –1.0
5.0 to –1.0
Cell Voltage (Pin 5) to Gnd (Pin 6)
Thermal Resistance, Junction–to–Air
R
°C/W
θJA
N Suffix, SOT–23 Plastic Package, Case 1262
TBD
Operating Junction Temperature (Note 1)
Storage Temperature
T
–40 to 85
–55 to 125
°C
°C
J
T
stg
2
MOTOROLA ANALOG IC DEVICE DATA
MC33349
ELECTRICAL CHARACTERISTICS (C = 0.01 µF, T = 25°C, for min/max values T is the operating junction temperature range
t
A
A
that applies, unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
VOLTAGE SENSING
Cell Charging Cutoff (Pin 5 to Pin 6)
Overvoltage Threshold, V
–1, –3 Suffix
–2, –4 Suffix
Increasing
V
V
Cell
th(OV)
–
–
–
4.35
4.25
200
–
–
–
Overvoltage Hysteresis V
Decreasing
V
H
mV
V
Cell
Cell Discharging Cutoff (Pin 5 to Pin 6)
Undervoltage Threshold, V
–1, –3 Suffix
Decreasing
V
Cell
th(UV)
–
–
2.30
2.28
–
–
–2, –4 Suffix
Input Bias Current During Cell Voltage Sample (Pin 5)
I
–
–
–
–
–
20
75
13
2.0
26
–
–
–
–
–
µA
ms
ms
ms
ms
IIB
Overvoltage Delay Time (V
Unervoltage Delay Time (V
= 4.5 V)
= 2.1 V)
t
cell
(ovd)
t
cell
(uvd)
Cell Voltage Sampling Period
t
(smpl)
Cell Voltage Sampling Repitition Period
t
(rep)
CURRENT SENSING
Discharge/Charge Current Limit (Pin 2 to Pin 6)
Discharge Threshold Voltage
–1, –2 Suffix
V
mV
th(dschg)
–
–
–
150
75
50
–
–
–
–3, –4 Suffix
Discharge Current Hysteresis
Charge Threshold Voltage
–1. –2 Suffix
–3, –4 Suffix
Charge Current Hysteresis
DCH
%
mV
V
th(chg)
–
–
–
–150
–75
25
–
–
–
CCH
%
Current Limit Delay Time (1.0 nF load @ CO & DO; to V /2)
DD
Charge Gate Drive Output (Pin 3)
Discharge Gate Drive Output (Pin 1)
t
t
–
–
10
2.0
–
–
µs
µs
(ccld)
(dcld)
OUTPUTS
Charge Gate Drive Output Low (Pin 3 to Pin 2 @ I = 50 µA)
V
–
–
–
–
0.2
0.1
0.2
0.2
–
–
–
–
V
V
V
V
O
olc
Charge Gate Drive Output High (Pin 5 to Pin 3 @ I = –50 µA)
V
ohc
O
Discharge Gate Drive Output Low (Pin 1 to Pin 6 @ I = 50 µA)
V
old
O
Discharge Gate Drive Output High (Pin 5 to Pin 1 @ I = –50 µA)
V
ohd
O
TOTAL DEVICE
Average Cell Current
I
cell
Operating (V
= 3.9 V)
–
–
8.5
4.0
–
–
µA
nA
cell
Sleepmode (V
= 2.0 V)
cell
Minimum Operating Cell Voltage
V
cell
–
1.5
–
V
3
MOTOROLA ANALOG IC DEVICE DATA
MC33349
PIN FUNCTION DESCRIPTION
Description
Pin
Symbol
1
DO
This output connects to the gate of discharge MOSFET switch Q2 allowing it to enable or disable battery pack
discharging.
2
P–
This is a multifunction pin that is used to monitor cell charge and discharge current and to provide a gate turn–off
path for charge switch Q1. A current limit fault is set when the combined voltage drop of charge switch Q1 and
discharge switch Q2 exceeds the discharge current limit threshold voltage, V
above Pin 6 caused by a
th(dschg)
below Pin 6 caused by a charger.
load; or charge current limit threshold voltage, V
th(chg)
3
4
5
CO
This output connects to the gate of charge MOSFET switch Q1 allowing it to enable or disable battery pack
charging.
C
An external capacitor connects between this pin and ground (Pin 6) to set the sample timer frequency and
overvoltage delay time.
t
V
cell
This input connects to the positive terminal of the cell for voltage monitoring and provides operating bias for the
integrated circuit. Internally, the Cell Voltage Sample Switch periodically applies this voltage to a resistor divider
where it is compared by the Cell Voltage Detector to an internal reference.
6
Gnd
This is the ground pin of the IC.
4
MOTOROLA ANALOG IC DEVICE DATA
MC33349
PROTECTION CIRCUIT OPERATING MODE TABLE
Outputs
MOSFET Switches
Input Conditions
Cell Status
Circuit Operation
Battery Pack Status
Charge
Q1
Discharge
Q2
CELL CHARGING/DISCHARGING
Storage or Nominal Operation:
No current or voltage faults
Both Charge MOSFET Q1 and Discharge MOSFET Q2 are on. The
battery pack is available for charging or discharging.
On
On
On
CELL CHARGING FAULT/RESET
Charge Voltage Limit Fault:
Charge MOSFET Q1 is latched off and the cell is disconnected from
On to Off
V
≥ V
for two consecutive the charging source. An internal current source pull–up is applied to
Pin 5
samples
th(OV)
divider resistors R1 and R2 creating a hysteresis voltage of V . The
H
battery pack is available for discharging. Discharge current limit
protection is disabled.
Charge Voltage Limit Reset:
< (V – V )
Charge MOSFET Q1 will turn on when the voltage across the cell falls
Off to On
On to Off
Off to On
On
On
On
V
sufficiently to overcome hysteresis voltage V , or when a load is
Pin 5
for one sample, or
> V
th(OV)
H
H
applied to the battery pack.
V
Pin 2
Charge Current Limit Fault:
≤ (V + V
th(dschg)
Charge MOSFET Q1 is latched off and the cell is disconnected from
V
Pin 2
)
the charger. Q1 will remain in the off state as long as V
exceeds
Pin 6
th(chg)
Pin 6
. The battery pack is available for discharging.
V
Pin 2
by ≈ V
th(chg)
Discharge current limit is disabled.
Charge Current Limit Reset:
– V < V
The Sense Enable circuit will reset and turn on charge MOSFET Q1
V
Pin 6
when V no longer exceeds V
accomplished by either disconnecting the charger from the battery
pack, or by connecting the battery pack to a load.
by ≈ V
. This can be
Pin 2
th(chg)
Pin 6 Pin 2
th(chg)
CELL DISCHARGING FAULT/RESET
Discharge Current Limit Fault:
Discharge MOSFET Q2 is latched off and the cell is disconnected from
On
On
On
On
On to Off
Off to On
On to Off
Off to On
V
Pin 2
≥ (V
+ V
)
the load. Q2 will remain in the off state as long as V exceeds V
Pin 6
th(dschg)
Pin 2
Pin 6
. The battery pack is available for charging. Charge
current limit protection is disabled.
by ≈ V
th(dschg)
Discharge Current Limit Reset:
– V < V
The Sense Enable circuit will reset and turn on discharge MOSFET Q2
V
Pin 2
when V no longer exceeds V
accomplished by either disconnecting the load from the battery pack, or
by connecting the battery pack to the charger.
by ≈ V . This can be
Pin 6
th(dschg)
Pin 2 Pin 5
th(dschg)
Discharge Voltage Limit Fault:
≤ V 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.
V
Pin 5
th(UV)
Discharge Voltage Limit Reset:
> (V + 0.6 V)
The Sense Enable circuit will reset and turn on discharge MOSFET Q2
V
Pin 6
when V
exceeds V
by 0.6 V. This can be accomplished by
Pin 2
Pin 6
Pin 2
connecting the battery pack to the charger.
TEST MODE – PIN 4/PIN 5 SHORT
Continuous Charge Voltage Limit
Comparator
This condition occurs if Pin 4 and Pin 5 are accidently shorted together
or purposely connected for rapid Charge Voltgae Limit Testing.
MOSFET Q1 On to Off is not delayed and no hysteresis is required for
reset.
V
Pin 4
V
Pin 4
= V
= V
= V
= V
< V
> V
On
Off
On
On
Pin 5
Pin 5
cell
cell
th(chg)
th(chg)
FAULTY CELL
Discharge Voltage Limit Fault:
≤ 1.5 V
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
Off
Off
V
Pin 5
V
before a sample is taken.
th(UV)
5
MOTOROLA ANALOG IC DEVICE DATA
MC33349
OUTLINE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 1262–01
(SOT–23)
ISSUE O
E
M
M
0.05
0.20
C B
PIN 1 INK MARK
IDENTIFIER
NOTES:
1. DIMENSIONS ARE IN MILLIMETERS.
2. INTERPRET DIMENSIONS AND TOLERANCES
PER ASME Y14.5M, 1994.
3. DIMENSION D DOES NOT INCLUDE FLASH OR
PROTRUSIONS. FLASH OR PROTRUSIONS
SHALL NOT EXCEED 0.23 PER SIDE.
4. TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
C
1
2
6
5
A
A
5. DIMENSIONS D AND E1 ARE TO BE DETERMINED
AT DATUM PLANE H.
3
4
MILLIMETERS
A1
A
DIM
A
A1
b
b1
c
c1
D
E
E1
e
e1
L
MIN
0.90
0.00
0.35
0.35
0.09
0.09
2.80
2.60
1.50
MAX
1.45
0.15
0.50
0.45
0.20
0.15
3.00
3.00
1.75
E1
B
A
b
0.95
1.90
0.25
0
0.55
10
H
L
b1
SECTION A–A
6
MOTOROLA ANALOG IC DEVICE DATA
MC33349
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
specificallydisclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
datasheetsand/orspecificationscananddovaryindifferentapplicationsandactualperformancemayvaryovertime. Alloperatingparameters,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
applicationsintended 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
ordeathmayoccur. ShouldBuyerpurchaseoruseMotorolaproductsforanysuchunintendedorunauthorizedapplication,BuyershallindemnifyandholdMotorola
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
Opportunity/Affirmative Action Employer.
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
7
MOTOROLA ANALOG IC DEVICE DATA
MC33349
Mfax is a trademark of Motorola, Inc.
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MC33349PP/D
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