An3232 Rev. 1.1 March 2010 1-Cell Lithium-Ion/Polymer ... · An3232 Rev. 1.1 March 2010 6 Proezd...

An3232 Rev. 1.1 March 2010

1Proezd4806,Bld4/3,Zelenograd,Moscow,Russia,124460Tel:+7(499)731‐4906;+7(499)731‐3270;Fax:+7(499)731‐1508E‐mail:[email protected];Web:www.angstrem.ru

1-Cell Lithium-Ion/Polymer Protector

OUTLINE

This product is high voltage CMOS-based protection ICs for over-charge/discharge, excess load current and short circuit protection of rechargeable one-cell Lithium-ion (Li+) / Lithium polymer battery.

If any of above abnormal conditions occurs, An3232 will turn MOSFETs off to protect the battery.

An3232 will turn into power down mode to minimize the current consumption when over-discharge protection occurs.

An3232 can perform protection functions with only five components – two MOSFETs, two resistors and one capacitor.

The tiny package of SOT-23-5/SOT-23-6 is especially suitable for the battery packs in portable devices.

FEATURES:

Low supply current • Supply current (At normal mode) Typ. 3.5µA • Standby current (detecting over-discharge) Max. 0.3µA

High accuracy detector threshold • Over-charge detector (Topt=25°C) ±30mV • Over-discharge detector ±50mV • Excess discharge-current detector ±30mV

Internal fixed Output delay time • Over-charge detector Output Delay 150ms • Over-discharge detector Output Delay 25 ms • Excess discharge-current detector Output Delay 9 ms • Short Circuit detector Output Delay 300 µs

0V-battery charge option • acceptable/unacceptable

Ultra Small package • SOT-23-5 / SOT-23-6 pin

An3232 Rev. 1.1 March 2010


APPLICATIONS

• Lithium-ion rechargeable battery packs. • Lithium-polymer rechargeable battery packs.

TYPICAL APPLICATION

+

-

VDD V- VSS DOUT COUT

470Ω

0.1uF

1kΩ

R1

R2

C1

An3232

BAT+

BAT-

An3232 Rev. 1.1 March 2010


BLOCK DIAGRAM.

An3232 Rev. 1.1 March 2010


BONDING DIAGRAM

Chip size is x = 0.85 mm; y = 0.76 mm without scribe line; Chip size is x = 0.93 mm; y = 0.84 mm with scribe line; Scribe line width is 0.08 mm.

An3232 Rev. 1.1 March 2010


PINS CONFIGURATIONS.

PIN DESCRIPTION.

Pin No. Symbol Description SOT-23-5 SOT-23-6 1 2 V- Pin for charger negative input 2 5 VDD Power supply 5 3 COUT Output of over-charge detection, CMOS output 4 1 DOUT Output of over-discharge detection, CMOS output - 4 NC Not connection 3 6 VSS VSS pin. Ground pin for the IC

ABSOLUTE MAXIMUM RATINGS

VSS=0V Symbol Item Ratings Unit

VDD Supply voltage -0.3 to 12 V V- V- pin input voltage VDD -26 to VDD +0.3 V

VCOUT COUT pin output voltage VDD -26 to VDD +0.3 V

VDOUT

DOUT pin output voltage VSS -0.3 to VDD +0.3 V

PD Power dissipation 150 mW TOP Operating temperature range -40 to 85 °C TSTG Storage temperature range -55 to 125 °C

An3232

1 2 3

45 6

SOT-23-6

An3232

1 2 3

4 5

SOT-23-5

An3232 Rev. 1.1 March 2010


ELECTRICAL CHARACTERISTIC

TOPT=25°C Symbol Item Conditions Min. Typ. Max. Unit

VDD Operating input voltage Voltage defined as VDD-VSS 1.5 --- 10 V V0CHA 0V battery charge starting charger voltage 0V battery charging

available 1.2 --- --- V

V0INH 0V battery charge inhibition battery voltage 0V battery charging unavailable

--- --- 0.5 V

VDET1 Over-charge threshold --- 4.26 4.29 4.32 V VREL1 Over-charge detection release voltage --- 4.04 4.09 4.14 V tVDET1 Output delay of over-charge VDD=3.5V 4.4V 50 150 300 ms VDET2 Over-discharge detection voltage --- 2.45 2.5 2.55 V VREL2 Over-discharge detection release voltage --- 2.6 2.7 2.8 V tVDET2 Output delay of over-discharge VDD=3V 2.3V 10 25 40 ms VDET3 Excess discharge-current detection voltage VDD=3.5V 0.12 0.15 0.18 V tVDET3 Output delay of excess discharge-current VDD=3.5V 4 9 16 ms

VSHORT Short protection voltage VDD=3.5V 0.25 0.5 0.75 V tSHORT Output delay of Short protection VDD=3.5V 150 300 500 μs VCH Charger detection voltage --- -1.2 -0.7 -0.2 V

RCOH COUT pin H resistance VCOUT=3,VDD=3.5,V-=0 --- 5 10 KΩ RCOL COUT pin L resistance VCOUT=0.5,VDD=4.5,V-=0 --- 5 10 KΩ RDOH DOUT pin H resistance VDOUT=3,VDD=3.5,V-=0 --- 5 10 KΩ RDOL DOUT pin L resistance VDOUT=0.5,VDD=2.3,V-=0 --- 5 10 KΩ RVMD Internal resistance between V- and VDD VDD=2V, V-=0V 100 300 900 KΩ RVMS Internal resistance between V- and VSS VDD=3.5V, V-=1.8V 20 40 80 KΩ IDD Supply current VDD=3.5V, V-=0V --- 3.5 6 μA

ISTANDBY Standby current Power down mode enable

VDD=2.0V, V- floating 0.3 μA

IST Standby current Power down mode disable

VDD=2.0V 3.0 5 μA

An3232 Rev. 1.1 March 2010


STATE MACHINE

An3232 Rev. 1.1 March 2010


OPERATIONS

The An3232 provides overcharge, over-discharge, discharge over-current and short circuit protections for the 1-cell battery pack. When the battery pack is in charging stage, the current flow is from BAT- to BAT+. An3232 continuously senses the battery by VDD pin if the overcharge occurs. On the other hand, when the battery pack is in discharging stage, the current flow is from BAT+ to BAT-. An3232 also senses battery by VDD pin if the over-discharge occurs. In the meanwhile, there is a positive voltage between VSS and BAT-. This positive voltage is determined by the product of discharge current and series RDS(on) of MOSFETs. An3232 detects this positive voltage by V- pin if the discharge over-current or short circuit occurs as well.

(1) Overcharge Condition

1) Overcharge Protection: when the VDD voltage is equal to or higher than the overcharge detection voltage (VDET1) for a certain delay time (tVDET1), An3232 will turn off the external Nch MOSFET by COUT pin to protect the pack from being overcharged. In the meanwhile, COUT pin turns to “L ” from “H” level. 2) Overcharge Protection Release: The overcharge protection can be released by either of the following conditions:

(a) Remove charger and connect a load when the battery voltage is lower than the detection voltage VDET1. (b) The battery voltage is lower than the overcharge release voltage and with the condition V- < VDET3.

(2) Over-discharge Condition

1) Over-discharge Protection: When the VDD voltage is equal to or lower than the over-discharge detection voltage (VDET2) for a certain delay time (tVDET2), An3232 will turn off the external Nch MOSFET by DOUT pin to protect the pack from being over-discharged. In the meanwhile, DOUT pin turns to “L ” from “H” level 2) Over-discharge Protection Release:

(a) The over-discharge protection can be released when and battery voltage that is equal to or higher than VDET2.

(b) The over-discharge also can be released when a charger is connected (V- > VCH) and the battery voltage goes higher than VDET2+VHYS2.

(3) Discharge Over-current Condition

1) Discharge Over-current Protection: The An3232 provides 2 levels of discharge over-current protection - discharge over-current and short circuit protection. When any of the discharge over-current conditions happens, the level of DOUT pin will become to “L ” from “H” to turn off the MOSFET to cut off the discharge flow.

(a) Discharge over-current protection happens when V- pin voltage is in the condition of VDET3≤V-<VSHORT for a delay time (tVDET3) specified.

(b) Short circuit protection occurs when V- pin voltage is in the condition of V-≥VSHORT for a delay time (tSHORT) specified.

2) Discharge Over-current Protection Release: Any of the discharge over-current protections will be released to the normal mode when the load current reduces and the V- pin voltage is lower than V-<VDET3.

(4) Power Down Condition

1) Entering to Power Down Mode: An3232 enters to the power down mode when over-discharge protection occurs. The V- pin voltage will be pulled high to the VDD through the RVMD resister and the voltage on V- pin is higher than VSHORT. The internal circuits will be turned off, therefore, the standby current consumption of An3232 will be reduced to only 300nA (Max.). 2) Power Down Mode Release: The power down mode will be released when a charger is connected and the voltage on V- pin is lower than VSHORT.

An3232 Rev. 1.1 March 2010


TIMING CHART Detect and release from Over-charge Operation:

Connect Charger Open Connect Charger Connect

load

VDD

tVDET1

VDD

tVDET1

tVREL1 tVREL1

VDET1

V-

COUT

t

t

VREL1

An3232 Rev. 1.1 March 2010


TIMING CHART (CONTINUED) Detect and release from Over-discharge Operation (including excess discharge current and short-circuit operation):

An3232 Rev. 1.1 March 2010


Constant for external components:

Symbol Recommend Min. Max. FET1 --- --- --- FET2 --- --- ---

R1 470Ω 300Ω 1KΩ C1 0.1uF 0.022uF 1.0uF R2 1KΩ 300Ω 4KΩ

FET1, FET2:

0.4 V ≤ Threshold voltage ≤ Over-discharge detection voltage, Gate to source withstand voltage ≥ Charger voltage.

• If the threshold voltage of an FET is lower than 0.4 V, the FET may not stop the charging current.

• If an FET has a threshold voltage equal to or higher than the over-discharge detection voltage, discharging may stop before over-discharge is detected.

• If the charger voltage is higher than the withstanding voltage between the gate and source, the FET may be damaged.

1. R1: Set resistance to the value 2R1 ≤ R2.

a. Using an overspec R1 may result in overcharge detection voltage and release voltage higher than the expectation.

b. If R1 has a high resistance, the voltage between VDD and VSS may be higher than absolute maximum rating when a charger is connected reversely since the current flows from the charger to IC.

2. C1: Install a 0.022uF capacitor or higher.

• Apply a capacitor less than 0.022uF as C1, DOUT may oscillate when load short circuit is detected.

3. R2: The resistor is preventing big current when a charger is connected in reverse.

• If R2 resistance is higher than 4kΩ, the charging current may not be cut when a high-voltage charger is connected.

Caution: The application circuit above is for reference only. To determine the correct constants,

evaluation of actual application is required.

+

-

VDD V- VSS DOUT COUT

R1

R2

C1

FET1 FET2

Battery

An3232 Rev. 1.1 March 2010


PACKAGE INFORMATION

NOTES: 1) All dimensions shows in mm 2) Reference: JEDECMO-178AA

SYMBOL MIN NOM MAX A --- --- 1.45 A1 0.00 --- 0.15 A2 0.90 1.15 1.30 B 0.30 0.40 0.50 C --- 0.95 BSC --- C1 --- 1.90 BSC --- D 2.70 2.90 3.10

SYMBOL MIN NOM MAX E 2.60 2.80 3.00 E1 1.40 1.60 1.80 L 0.30 0.45 0.60 L1 --- 0.6 REF --- α 0º 4º 8º α1 5º 10º 15º

SOT-23-6D

C1

E E1

C

B

SOT-23-5 D

C1

E E1

C

B

A A2

A1

L1

L

α1

α1

α

An3232 Rev. 1.1 March 2010 1-Cell Lithium-Ion/Polymer ... · An3232 Rev. 1.1 March 2010 6 Proezd...

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