MITSUMI

Control for Lithium Ion Battery Charging (one cell) MM1333

Control for Lithium Ion Battery Charging (one cell)

Monolithic IC MM1333

Outline

This IC was developed for use in charging lithium ion batteries. PNP power transistor or P-MOS FET is

mounted externally to control charging. This IC is for use with a single cell only, and provides precise control

of the charging voltage ; the charging current can be set through an external resistance. In addition to the

functions of the MM1332, it incorporates a comparator for full-charge detection.

Features

1. Output voltage 1 (Ta=25°C)

4.100V±35mV

2. Output voltage 2 (Ta=0°C~+40°C)

4.100V±50mV

3. Constant-current output

Current limit

100mV±10mV

Constant current value = current limit/external resistance

4. Low-voltage (LV) detection function

2.00V±100mV

5. Full-charge detection function

Detection voltage

31mV±5mV

Package

VSOP-8A (MM1333 W)

Note: Output (charge) voltage rank is inside the .

Applications

1. Lithium ion battery chargers

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Package

VSOP-8A, 8B

4.200±0.050

20±3

1cell

MM1333

4.100±0.050

31±5

1cell

4.200±0.050

31±5

1cell

Output

voltage (V)

Output voltage

temperature

conditions

Full charge

detection

voltage (mV)

Over voltage

detection

voltage (v)

Remarks

Series Table

Temperature conditions A: Ta=-25~75°C, B: Ta=-20~70°C, C: Ta=0~50°C,

D: Ta=0~40°C

Note: In the case of rank D, the Co output voltage level changes to "L" when charging is turned ON. (The

function is reversed in the case of ranks H and J).

MITSUMI

Control for Lithium Ion Battery Charging (one cell) MM1333

Recommended Operating Conditions

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Item

Symbol

Ratings

Units

Operating temperature

OPR

-20~+70

°C

Operating voltage

OPR

+5~+12

Absolute Maximun Ratings

(Ta=25°C)

Item

Symbol

Ratings

Units

Storage temperature

STG

-40~+125

°C

Operating temperature

OPR

-20~+70

°C

Power supply voltage

max.

-0.3~+13

Output voltage

max.

-0.3~V

SW input voltage

-0.3~V

+0.3

Allowable loss

300

Pin Description

Values given are standard

Pin no.

Pin name

Input/output

Function

Input

Input pin for on/off control
SW=V

: off, SW=GND : on

Pulled up to V

, so turned off when open

Full-charge signal output pin
While charging : Open collector output NPN transistor is off
At full charge : Open collector output NPN transistor is on

output

GROUND pin

GND

Input

Full charge detection pin
The current is detected through the voltage drop across an external
resistance, to control the full-charge signal.
The ratio of the charge current set by CS1 and the current at full-charge signal
output is (VIC)/(0.1 V R4/(R3+R4))

CS2

Input

Current detection pin
The current is detected through the voltage drop across an external
resistance, to maintain a constant current. The current value can be set using
0.1 V/(R3+R4).

CS1

Input

CEL

Input

Battery voltage input pin
The battery voltage is detected and used to maintain the voltage at the
prescribed value.
A low-voltage detection circuit is also present, and charging is forbidden when
the battery voltage is less than 2V.
Constant-voltage circuit output pin
The base of an external PNP transistor or gate of a P-MOS FET is controlled in
constant-voltage charging.

EXT

Output

Input

Power supply input pin

MITSUMI

Control for Lithium Ion Battery Charging (one cell) MM1333

Measurement Method

(Except where noted otherwise, Ta=25°C, V

=5V, SW2 : A, SW4 : A, SW6 : A, SW7 : A)

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Item

Measurement Method

Consumption current 1

Set V1=0 V, SW4=B, V4=50mV, V6=4.5V ; switch SW6 from A to B and again to A ; then measure the A8 current I

Consumption current 2

Set V1=0V, SW4=B, V4=50mV, V6=4.5V ; switch SW6 from A to B and again to A ; then measure the A8 current I

Consumption current 3

Set V1=V

, and measure the resulting A8 current I

Output voltage

Set V1=0V, V6=4.5V; switch SW6 from A to B and again to A ; then measure the T6 voltage V

Current limit

Set V1=0V, set the voltage V6 about 1V lower than the potential at T6 (output voltage), and set SW6
to B ; then measure the T5 voltage V

CEL-CS leakage current

Set V

=0V, V1=0V; set the voltage V6 to 5V; and set SW6 to B and SW7 to C. Then measure the A6 current I

CEL

SW input current

With V1=0V, measure the A1 current I

SW input voltage

Set the voltage V6 1V lower than the T6 potential (output voltage), and set SW6 to B. With the
voltage V1 variable, when the A6 current is 100mA or higher this voltage is equal to the charge-on
voltage (VL), and when the current is within ±10µA it is equal to the charge-off voltage (VH).

Low-voltage

detection voltage

Set V1=0 V, set V6 to 1V lower than the T6 potential (output voltage), and set switch SW6 to B. Then
gradually lower the voltage V6 ; the voltage V6 at which the A6 current is within ±10µA is LV.

EXT pin input voltage

Measure the A7 current IS with V1=0V, SW6 set to B, SW7 set to B, V6=3V, and V7=4V.

EXT pin output voltage

Set V1=0 V, SW6 to B, and SW7 to C. The T7 voltage when V6=3V and V6=5V is V

EXT

Full-charge

detection voltage

Set V1=0V and SW4 to B. Gradually lower the voltage V4 from 50mV ; the voltage V4 when the T2
potential falls to 1V or lower from (V

-1) V or higher is VIC.

Full-charge

detection output L

Measure the T2 voltage V

COL

when V1=0V, SW4 is at B and V4=0V.

Full-charge detection

output leakage current

Measure the A2 current I

when V1=0V, SW4 is at B, V4=50mV, SW2 is at B, and V2=5V.

Warnings regarding use
1. The following components should be added in preparation for use.

1. A capacitance of several µF or so between V

and GND

2. A 10µF capacitor between CEL and CS
3. A diode to prevent backflow between the collector of the external PNP transistor and pin 6
4. A current-limiting 150

resistor between the base of the external PNP transistor and EXT

2. The full charge detection circuit detects voltages of order several mV, and so no hysteresis is applied.

Chattering will occur, and should be born in mind.

3. There is an internal low-voltage detection circuit. If a voltage of at least 2V is not applied to the CEL pin, no

output will be obtained.

Electrical Characteristics

(Except where noted otherwise, Ta=25°C, V

=5V, SW2, 4, 6, 7 : A) Models listed MM1333

Item

Symbol

Measurement conditions

Min. Typ. Max. Units

Consumption current 1

VSW=0V (Charge : ON)

300

400

µA

Consumption current 2

VSW=0V (Charge : ON)

1.1

1.6

Consumption current 3

VSW=V

(Charge : OFF)

µA

Output voltage 1

Ta=25°C

4.065 4.100 4.135

Output voltage 2

Ta=0~+40°C

4.050 4.100 4.150

Output voltage temperature drift

Ta=-20~+70°C

±0.25

°C

Current limit

100

110

CEL-CS leakage current

CEL

µA

SW input current

µA

SW input voltage

Charge : ON

-0.3

2.0

Charge : OFF

-1.0

+0.3

Low-voltage detection voltage

1.90

2.00

2.10

EXT pin input voltage

EXT pin output voltage

EXT

No load

0.3

-0.3

Full-charge detection voltage

Full-charge detection output L

COL

SINK

=0.3mA

0.2

0.4

Full-charge detection

output leakage current

µA

MITSUMI

Control for Lithium Ion Battery Charging (one cell) MM1333

Timing Chart

OFF

- 1.0 ~ V

+ 0.3)

CEL

CS1,2
(When R3=0)

Battery connected and SW on

CS1,2
(When R3=0)

CEL

Charge off

Charge on signal

With CO pulled up to V

by a resistance

Full-charge signal

Charge on

Normal charging

Low battery voltage

(2V or lower)

(-0.2~2.0V)

100mV

31mV

Note: In the case of rank D, the Co output voltage level changes to "L" when charging is turned ON. (The

function is reversed in the case of ranks H and J).

OFF

Battery connected and SW ON

OFF

CEL

CS1,2
(When R3=0)

CEL

Charge OFF

Charge ON signal

Full-charge signal

Charge ON

Normal charging

Low battery voltage

(2V or lower)

100mV

20mV

MM1333J, H

MM1333D

MITSUMI

Control for Lithium Ion Battery Charging (one cell) MM1333

Application circuits

1. A diode is required to prevent reverse current from the battery.

2. Even higher precision can be obtained by inserting R2 for output voltage adjustment.

CEL intake current is used to adjust output voltage with R2. CEL intake current is around 3 ~ 10µA.

3. Charging current can be set with R3+R4.

Example : To set to 0.25A

VCL/(R3+R4) = 0.1V/0.4

= 0.25A

4. Full charge detection current can be adjusted by the ratio between R3 and R4.

Example : H rank

VIC/(VLC R4/(R3 + R4) = 0.031V/(0.1 0.21

/(0.19 + 0.21)) = 0.59

This makes the ratio between charging current and full charge detection current 1 : 0.59.

Charging current was set at 0.25A in step 3 above, so full charge detection current is 0.25A 0.59 = 0.148A.

MITSUMI

Control for Lithium Ion Battery Charging (one cell) MM1333

5. R5 and R6 are resistors for positive feedback (hysteresis). Hysteresis is applied for the amount of R5

voltage drop, and should be set below (about 1/3) full charge voltage.

Also, at this time, full charge detection voltage changes by the amount of R5 voltage drop.

Example : Setting full charge detection current using H rank and taking hysteresis voltage into account.

Setting conditions : charge current 0.25A (R3 + R4=0.4

), full charge current 0.1A, MPU power supply 5V,

full charge hysteresis 10mV

Full charge current is set by comparing the reference voltage (VIC=0.031V) and CS2 pin voltage (V2) inside

the IC. An example of calculation for setting full charge current at 0.1A is shown below.

(V2-V1)+IBATT R4=0.031V

Here, V2-V1 (potential at ends of R5) is the hysteresis. In order to set hysteresis at 10mV, find R4 as

follows.

R4=(0.031V-(V2-V1)/IBATT=(0.031V-0.01V)/0.1A = 0.21

From R3 + R4 = 0.4

, R3 = 0.4-0.21 = 0.19.

Hysteresis Setting (R5 ~ R7)

The current values that flow on R5~R7 from 3V are minute due to the high impedance of the CS2 pin, and

so do not cause a problem. (It is assumed that the effects of noise, etc. must be considered for each

individual set.) Here the setting is for 10µA. CO is low level during full charge detection, so V2-V1 = 0V.

When V2-V1 is set to 10mV during charging (CO high), then R5 + R6 + R7 = 3V/10µA = 300kW. (R4 is

extremely small as compared to R5~R7 and thus is ignored.)

3V : 0.01V=(R5 + R6 + R7) : R5

From the above equation, R5 = 1k

, R6 + R7 = 299k, and R6 and R7 resistance values must be set so

that CS1 can be low level. If CS1 sink current is 0.15mA, then R7 = 3V/0.15mA=20k

, R6=299k-20k =

279k

Therefore, R3 = 0.19

, R4 = 0.21, R5 = 1k, R6 = 279k, R7 = 20k.

Please note that the above figures are examples given for reference purposes, and should be used in actual

practice only after sufficient examination.

MITSUMI

Control for Lithium Ion Battery Charging (one cell) MM1333

Charging (V

=5V, Output voltage 4.1V)

Output voltage vs ambient temperature
(V

=5V, Output voltage 4.1V)

Output voltage vs power supply voltage
(Ta=25°C, Output voltage 4.1V)

4.15
4.14
4.13
4.12
4.11

4.1

4.09
4.08
4.07
4.06
4.05

Output voltage (V)

-25

Ambient temperature (

°C)

4.15
4.14
4.13
4.12
4.11

4.1

4.09
4.08
4.07
4.06
4.05

5 6 7 8 9 10 11 12 13 14 15 16 17 18

Power supply voltage (V)

Output voltage (V)

4.5

4.4
4.3
4.2
4.1

3.9
3.8
3.7
3.6
3.5

Power supply voltage V (V)

0.5

1.5

2.5

Charging time (h)

Characteristics

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-25

75 85

Ambient temperature (

°C)

H-rank full charge detection voltage (mV)

-25

75 85

Ambient temperature (

°C)

D-rank full charge detection voltage (mV)

H-rank full charge detection voltage [mV]

D-rank full charge detection voltage [mV]

4.15

4.10

4.05

Power supply voltage (V)

H-rank output voltage (V)

H-rank output voltage [V]

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: MM1333

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: MM1333