Motorola MC33348D-6, MC33348D-4, MC33348D-5, MC33348D-3, MC33348D-1 Datasheet

 

  
   
 

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

Order this document by MC33348/D



LITHIUM BATTERY

PROTECTION CIRCUIT

FOR

ONE CELL

SMART BATTERY PACKS

SEMICONDUCTOR

TECHNICAL DATA

8

1

Ordering Information shown on following page.

Typical One Cell Smart Battery Pack

Cell

Voltage

1

MC33348

Ground

3

T est

2

Charge Pump

8 Charge

Output

Discharge

Gate Drive

Output

4 6 5 Charge

Gate Drive

Output

7

V

CC

Gate Drive
Common/
Discharge
Current Limit

PLASTIC PACKAGE

PIN CONNECTIONS

Cell Voltage

Test

Ground

Discharge Gate

Drive Output

D SUFFIX

CASE 751

(SO–8)

18

2

3

4

(Top View)

Charge Pump
Output

V

7

CC

Charge Gate

6

Drive Output
Charge Gate Drive

5

Common/Discharge
Current Limit

This device contains 1170 active transistors.

This document contains information on a new product. Specifications and information herein
are subject to change without notice.

MOTOROLA ANALOG IC DEVICE DATA

 Motorola, Inc. 1997 Rev 1

1

MC33348

4.20

2.25

4.25

300

2.28

T

25° to +85°C

SO–8

4.35

2.30

ORDERING INFORMATION

Charge

Overvoltage

Device

MC33348D–1
MC33348D–2
MC33348D–3
MC33348D–4
MC33348D–5
MC33348D–6

NOTE: Additional threshold limit options can be made available. Consult factory for information.

Threshold (V)

MAXIMUM RATINGS

Ratings Symbol Value Unit

Input Voltage (Measured with Respect to Ground, Pin 3)

Cell Voltage (Pin 1) 7.5
Test (Pin 2) 7.5
Discharge Gate Drive Output (Pin 4) 18
Charge Gate Drive Common/Discharge Current Limit (Pin 5) ±11
Charge Gate Drive Output (Pin 6) ±11
VCC (Pin 7) 7.5
Charge Pump Output (Pin 8) 10

Thermal Resistance, Junction–to–Air

D Suffix, SO–8 Plastic Package, Case 751 178

Operating Junction Temperature (Note 1)
Storage Temperature

NOTES: 1. Tested ambient temperature range for the MC33348:

T

= –25°CT

low

2.ESD data available upon request.

Charge

Overvoltage

Hysteresis (mV)

= +85°C

high

Discharge
Undervoltage
Threshold (V)

V

IR

R

θJA

T

J

T

stg

Discharge

Current Limit

Threshold (mV)

–40 to +150
–55 to +150

400
200
400
200
400
200

Operating

Temperature Range

–

= –

A

V

°C/W

°C
°C

Package

°

°

–

2

MOTOROLA ANALOG IC DEVICE DATA

MC33348

ÁÁÁÁ

ÁÁÁ

ÁÁÁÁ

ÁÁÁ

ÁÁÁÁ

ÁÁÁ

ÁÁÁÁ

ÁÁÁ

ÁÁÁÁ

ÁÁÁ

ÁÁÁÁ

ÁÁÁ

Á

ÁÁÁÁ

Á

Á

ÁÁÁ

Á

ÁÁÁÁ

ÁÁÁ

ELECTRICAL CHARACTERISTICS (V

= 4.0 V, TA = 25°C, for min/max values TA is the operating junction temperature range

CC

that applies (Note 1), unless otherwise noted.)

Characteristic

Symbol Min Typ Max Unit

VOLTAGE SENSING

Cell Charging Cutoff (Pin 1 to Pin 3)

Overvoltage Threshold, V

Increasing, TA = 25°C V

Cell

th(OV)

–1 Suffix 4.158 4.20 4.242
–2 Suffix 4.158 4.20 4.242
–3 Suffix 4.208 4.25 4.293
–4 Suffix 4.208 4.25 4.293
–5 Suffix 4.306 4.35 4.394
–6 Suffix 4.306 4.35 4.394

Overvoltage Hysteresis V

Decreasing V

Cell

H

–1 Suffix – 300 –
–2 Suffix – 300 –
–3 Suffix – 300 –
–4 Suffix – 300 –
–5 Suffix – 300 –
–6 Suffix – 300 –

Cell Discharging Cutoff (Pin 1 to Pin 3, TA = 25°C)

Undervoltage Threshold, V

Decreasing V

Cell

th(UV)

–1 Suffix 2.205 2.25 2.295
–2 Suffix 2.205 2.25 2.295
–3 Suffix 2.234 2.28 2.326
–4 Suffix 2.234 2.28 2.326
–5 Suffix 2.254 2.30 2.346
–6 Suffix 2.254 2.30 2.346

Input Bias Current During Cell Voltage Sample (Pin 1)
Cell Voltage Sampling Rate

I

IB

t

(smpl)

–
–

28

1.0

–
–

CURRENT SENSING

Discharge Current Limit (Pin 3 to Pin 5, TA = 25°C)

Threshold Voltage V

th(dschg)

–1 Suffix 360 400 440
–2 Suffix 180 200 220
–3 Suffix 360 400 440
–4 Suffix 180 200 220
–5 Suffix 360 400 440
–6 Suffix 180 200 220

Delay I

dly(dschg)

1.0 2.3 4.0 ms

CHARGE PUMP

Output Voltage (Pin 8, RL ≥ 1010, TA = 25°C)

V

O

8.0

10.2

12

TOTAL DEVICE

Average Cell Current (TA = 25°C, Battery Pack Unloaded and without

БББББББББББББББББ

Current Limit Fault)

I

CC

ÁÁÁ

ÁÁÁÁÁÁÁÁÁ

Operating (VCC = 4.0 V) – 17 20 µA
Sleepmode (VCC = 2.0 V) – 2.0 – nA

Minimum Operating Cell Voltage for Logic and Gate Drivers

NOTE: 1.Tested ambient temperature range for the MC33348:

T

= –25°CT

low

high

= +85°C

V

CC

–

1.5

–

V

mV

V

µA

s

mV

V

ÁÁ

V

MOTOROLA ANALOG IC DEVICE DATA

3

MC33348

Figure 1. Charge and Discharge

Threshold V oltage Change versus Temperature

1.2

0.8

Maximum Threshold

0.4

0

Typical Threshold Change Typical Threshold Change

Charge Limits

–0.4

, THRESHOLD VOLTAGE CHANGE (%)

–0.8

–1.2

th(OV & UV)

V

∆

TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C)

Figure 3. Gate Drive Output Voltage

12

10

versus Load Current

CO = 10 nF

°

C

TA = 25

Figure 2. Discharge Current Limit

Threshold V oltage Change versus Temperature

16

VCC = 4.0 V

8.0

0

, CURRENT LIMIT THRESHOLD

–8.0

VOLTAGE CHANGE (%)

th(dschg)

–16

V

∆

1004020–20–40 0 60 80 1004020–20–40 0 60 80

Figure 4. Gate Drive Output Voltage

12

10

CO = 10 nF
Pin 2 = Gnd
RL ≥ 1010
TA = 25°C

versus Supply V oltage

Ω

8.0

6.0

, GATE DRIVE OUTPUT VOLTAGE (V)

O

V

4.0

12

11

10

9.0

, CHARGE PUMP OUTPUT VOL TAGE (V)

O

V

8.0

VCC = 4.15 V

VCC = 3.25 V

VCC = 2.35 V

IL, OUTPUT LOAD CURRENT (µA) VCC, SUPPLY VOLTAGE (V)

Figure 5. Charge Pump Output Voltage

versus T emperature

CO = 10 nF

≥

1010

RL

VCC = 4.15 V

In Regulation

VCC = 2.35 V

Out of Regulation

8.0

6.0

, GATE DRIVE OUTPUT VOLTAGE (V)

O

V

1.00.80.60.20 0.4

4.0

4.0

5.01.00 2.0 3.0

Figure 6. Supply Current

2

10

Battery Pack Sleepmode Range

1

Ω

1004020–20–40 0 60 80

10

µ

0

10

–1

10

–2

10

, SUPPLY CURRENT ( A)

CC

I

–3

10

–4

10

0 1.0 2.0 3.0 5.0

versus Supply V oltage

Battery Pack Operating Range

123

1 – Battery pack unloaded without

discharge current limit fault.

2 – Battery pack loaded without

discharge current limit fault.

3 – Battery pack loaded or unloaded

with discharge current limit fault.

VCC, SUPPLY VOLTAGE (V)TA, AMBIENT TEMPERATURE (°C)

TA = 25°C

4.0

4

MOTOROLA ANALOG IC DEVICE DATA