Texas Instruments bq24702, bq24703 Datasheet

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1 2 3 4 5 6 7 8 9 10 11 12

24 23 22 21 20 19 18 17 16 15 14 13

ACDET

ACPRES

ACSEL

BATDEP

SRSET ACSET

VREF

ENABLE

BATSET

COMP

ACN ACP

ACDRV BATDRV VCC PWM VHSP ALARM VS GND SRP SRN IBAT BATP

bq24702, bq24703

PW PACKAGE

(TOP VIEW)

8

9 10 11 12 13 14

ACSEL

ACPRES

ACDET

ACDRV

BATDRV

NC

VCC

ACN ACP NC NC BATP IBAT NC

28 27 26 25 24 23 22

1

2

3

4

5

6

7

BATDEP

SRSET

ACSET

VREF

ENABLE

BATSET

COMP

PWM

VHSP

ALARM

VS

GND

SRP

SRN

21

20

19

18

17

16

15

bq24703

RHD PACKAGE

(BOTTOM VIEW)

NC - No internal connection

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MULTICHEMISTRY BATTERY CHARGER CONTROLLER AND

SYSTEM POWER SELECTOR

1

FEATURES

• Dynamic Power Management, DPM Minimizes

Battery Charge Time

• Integrated Selector Supports Battery

Conditioning and Smart Battery Learn Cycle

• Zero Volt Operation

• Selector Feedback Circuit Ensures

Break-Before-Make Transition

• ± 0.4% Charge Voltage Accuracy, Suitable for

Charging Li-Ion Cells

• ± 4% Charge Current Accuracy

• 300-kHz Integrated PWM Controller for

High-Efficiency Buck Regulation

• Depleted Battery Detection and Indication to

Protect Battery From Over Discharge

• 20- μ A Sleep Mode Current for Low Battery

Drain

• 24-Pin TSSOP Package and 5 mm × 5 mm QFN

package (bq24703 only)

bq24702 bq24703

SLUS553E – MAY 2003 – REVISED OCTOBER 2007

DESCRIPTION

The bq24702/bq24703 is a highly integrated battery charge controller and selector tailored for notebook and sub-notebook PC applications.

The bq24702/bq24703 uses dynamic power management (DPM) to minimize battery charge time by maximizing use of available wall-adapter power. This is achieved by dynamically adjusting the battery charge current based on the total system (adapter) current.

The bq24702/bq24703 uses a fixed frequency, pulse width modulator (PWM) to accurately control battery charge current and voltage. Charge current limits can be programmed from a keyboard controller DAC or by external resistor dividers from the precision 5-V, ± 0.6%, externally bypassed voltage reference (VREF), supplied by the bq24702/bq24703.

1

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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0

0.20

0.40

0.60

0.80

1

1.20

1.40

1.60

25 50 70 85

MAX Pd (W) @ 500 LFM

MAX Pd (W) @ 250 LFM

MAX Pd (W) @ 150 LFM

MAX Pd (W) @ 0 LFM

θJA = 89.37 C/W @ 0 LFM, θJA = 77.98 C/W @ 150 LFM, θJA = 73.93 C/W @ 250 LFM, θJA = 68.23 C/W @ 500 LFM

Maximum Power Dissipation (High K Board) - W

MAXIMUM POWER DISSIPATION

(HIGH K BOARD)

vs

FREE-AIR TEMPERATURE

TA - Free-Air Temperature - °C

0

0.20

0.40

0.60

0.80

1

1.20

1.40

25 50 70 85

MAX Pd (W) @ 500 LFM

MAX Pd (W) @ 250 LFM

MAX Pd (W) @ 150 LFM

MAX Pd (W) @ 0 LFM

θJA = 150.17 C/W @ 0 LFM, θJA = 110.95 C/W @ 150 LFM, θJA = 99.81 C/W @ 250 LFM, θJA = 86.03 C/W @ 500 LFM

Maximum Power Dissipation (Low K Board) - W

MAXIMUM POWER DISSIPATION

(LOW K BOARD)

vs

FREE-AIR TEMPERATURE

TA - Free-Air Temperature - °C

bq24702 bq24703

SLUS553E – MAY 2003 – REVISED OCTOBER 2007

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

DESCRIPTION (CONTINUED)

The battery voltage limit can be programmed by using the internal 1.196-V, ± 0.5% precision reference, making it suitable for the critical charging demands of lithium-ion cells. Also, the bq24702/bq24703 provides an option to override the precision reference and drive the error amplifier either directly from an external reference or from a resistor divider off the 5 V supplied by the integrated circuit.

The selector function allows the manual selection of the system power source, battery or wall-adapter power. The bq24702/bq24703 supports battery-conditioning and battery-learn cycles through the ACSEL function. The ACSEL function allows manual selection of the battery or wall power as the main system power. It also provides autonomous switching to the remaining source (battery or ac power) should the selected system power source terminate (refer to Available Options table for the differences between the bq24702 and the bq24703). The bq24702/bq24703 also provides an alarm function to indicate a depleted battery condition.

The bq24702/bq24703 PWM controller is ideally suited for operation in a buck converter for applications when the wall-adapter voltage is greater than the battery voltage.

DISSIPATION RATINGS

A. The JEDEC low K (1s) board design used to derive this data was a 3-inch × 3-inch, two layer board with 2 ounce

copper traces on top of the board.

B. The JEDEC high K (1s) board design used to derive this data was a 3-inch × 3-inch, multilayer board with 1 ounce

internal power and ground planes and 2 ounce copper traces on top and bottom of the board.

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SLUS553E – MAY 2003 – REVISED OCTOBER 2007

AVAILABLE OPTIONS

CONDITION

20 ° C ≤ TJ≤ 125 ° C

BATTERY AS POWER SOURCE

Battery removal Automatically selects ac + alarm Automatically selects ac + alarm Battery reinserted Selection based on selector inputs Adapter latched until adapter is removed or ac select toggles.

AC AS POWER SOURCE

AC removal Automatically selects battery Automatically selects battery AC reinserted Selection based on selector inputs Selection based on selector inputs

DEPLETED BATTERY CONDITION

Battery as power source Sends ALARM signal Automatically selects ac Sends ALARM signal AC as power source Sends ALARM signal Sends ALARM signal

ALARM SIGNAL ACTIVE

Depleted battery condition Depleted battery condition When selector input is not equal to selector

output (single pulse alarm)

bq24702PW bq24703RHD

SELECTOR OPERATION

bq24702 bq24703

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature range (unless otherwise noted)

V

CC

T

J

T

stg

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

(2) All voltages are with respect to ground. Currents are positive into and negative out of the specified terminals. Consult the Packaging

Supply voltage range – 0.3 to 30 V Battery voltage range: SRP, SRN – 0.3 to 30 V Input voltage: ACN, ACP – 0.3 to 30 V Virtual junction temperature range – 40 to 125 ° C Maximum source/sink current VHSP 50 mA Maximum ramp rate for V Maximum sink current ACPRES, COMP, ALARM 2.5 mA Maximum ramp rate for V Maximum source/sink current BATDRV 10 mA Maximum source/sink current ACDRV 10 mA Maximum source/sink current PWM 50 mA Maximum source/sink current pulsed ACDRV, (10- μ s rise time, 10- μ s fall time, 1-ms

pulse width, single pulse) Maximum source current VREF 30 mA Maximum source current SRP 100 mA Maximum difference voltage SRP – SRN 30 V Storage temperature range – 65 to 150 ° C

only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

section of the data book for thermal limitations and considerations of the package.

CC

(BAT)

(1) (2)

VALUE UNIT

10 V/ μ s

50 mA

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SLUS553E – MAY 2003 – REVISED OCTOBER 2007

RECOMMENDED OPERATING CONDITIONS

(T

= T

A

Supply voltage, (VCC) V

Negative ac current sense, (ACN) 7 28 V Positive ac current sense, (ACP) 7 28 V Negative battery current sense, (SRN) 5 28 V Positive battery current sense, (SRP) 5 28 V AC or adapter power detection (ACDET) 0 5 V AC power indicator (ACPRES) 0 5 V AC adapter power select (ACSEL) 0 5 V Depleted battery level (BATDEP) 0 5 V Battery charge current programming voltage (SRSET) 0 2.5 V Charge enable (ENABLE) 0 5 V External override to an internal 0.5% precision reference (BATSET) 0 2.5 V Inverting input to the PWM comparator (COMP) 0 5 V Battery charge regulation voltage measurement input to the battery — voltage gmamplifier (BATP) 0 5 V Battery current differential amplifier output (IBAT) 0 5 V System load voltage input pin (VS) 0 2.5 V Depleted battery alarm output (ALARM) 0 5 V Gate drive output ( PWM) VHSP VCC V Battery power source select output ( BATDRV) 0 28 V AC or adapter power source selection output ( ACDRV) VHSP VCC V ACSET 0 2.5 V Operating free-air temperature, T

) all voltages relative to V

OPR

SS

Analog and PWM operation 7 28 Selector operation 4.5 28

A

MIN MAX UNIT

-40 85 ° C

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ELECTRICAL CHARACTERISTICS

– 40 ° C ≤ TJ≤ 125 ° C, 7 V

QUIESCENT CURRENT

I

DD(OP)

I

DD(SLEEP)

LOGIC INTERFACE DC CHARACTERISTICS

V

OL

V

IL

V

IH

I

(SINK1)

I

(SINK2)

PWM OSCILLATOR

f

OSC(PWM)

V

(RAMP)

V

IK(COMP)

I

S(COMP)

LEAKAGE CURRENT

I

L( ACDET)

I

L(SRSET)

I

L(ACSET)

I

L(BATDEP)

I

L(VS)

I

L(ALARM)

I

L(ACSEL)

I

L(ENABLE)

I

L(ACPRES)

I

L(BATP)

I

L(BATSET)

Total chip operating current ACPRES = High, EN = 0 1 1.6 6 mA Total battery sleep current, ac not present ACPRES = Low 22 28 μ A

Low-level output voltage (ACPRES, ALARM) IOL= 1 mA 0.4 V Low-level input voltage (ACSEL, ENABLE) 0.6 V High-level input voltage (ACSEL, ENABLE) 1.8 V Sink current (ACPRES) V Sink current (ALARM) V

Oscillator frequency kHz

Maximum duty cycle 100% Input voltage for maximum dc (COMP) 3.8 V Minimum duty cycle 0% Input voltage for minimum dc (COMP) 0.8 V Oscillator ramp voltage (peak-to-peak) 1.85 2.15 2.30 Internal input clamp voltage

(tracks COMP voltage for maximum dc) Internal source current (COMP) Error amplifier = OFF, V

Leakage current, ACDET V Leakage current, SRSET V Leakage current, ACSET V Leakage current, BATDEP V Leakage current, VS V Leakage current, ALARM V Leakage current, ACSEL V Leakage current, ENABLE V Leakage current, ACPRES V Leakage current, BATP V Leakage current, BATSET V

SLUS553E – MAY 2003 – REVISED OCTOBER 2007

≤ V

DC

≤ 28 V

CC

, all voltages relative to V

DC

(unless otherwise specified)

SS

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

= 0.4 1.5 2 2.5 mA

OL

= 0.4 1.5 2 2.5 mA

OL

0 ° C ≤ TJ≤ 85 ° C 280 300 340 – 40 ° C ≤ TJ≤ 125 ° C 240 300 350

3.8 4.5

= 1 V 70 110 140 μ A

(COMP)

= 5 V 0.2 μ A

(ACDET)

= 2.5 V 0.2 μ A

(SRSET)

= 2.5 V 0.2 μ A

(ACSET) (BATDEP) (VS) (ALARM) (ACSEL) (ENABLE) (ACPRES) (BATP) (BATSET)

= 5 V 0.2 μ A

= 2.5 V 0.2 μ A

bq24702 bq24703

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I

BAT

+

SRSET

R

SENSE

1

A

V

Dc +

SRSET

A

V

, Totalaccuracy in % +

(

Dm* Dc

)

Dc

100,I

(SRP)

* I

(SRN)

+ 0

bq24702 bq24703

SLUS553E – MAY 2003 – REVISED OCTOBER 2007

ELECTRICAL CHARACTERISTICS (Continued)

– 40 ° C ≤ TJ≤ 125 ° C, 7 V

BATTERY CURRENT-SENSE AMPLIFIER

g

m

CMRR Common-mode rejection ratio See V

ICR

I

(SINK)

I

IB

V

(SET)

A

V

(1) Specified by design. Not production tested. (2) I

(SRP)

example: If (V

Transconductance gain 75 120 175 mA/V

Common-mode input (SRP, SRN) voltage range

Sink current (COMP) COMP = 1 V, (SRP – SRN) = 10 mV 0.5 1.5 2.5 mA Input bias current (SRP)

Input bias current accuracy (I Battery current programming voltage (SRSET) 0 2.5 V Battery current set gain 24 25 26 V/V

Total battery current-sense mid-scale accuracy

Total battery current-sense full-scale accuracy

= I

= (V

(SRN)

(SRSET)

≤ V

CC

/ 50 k Ω ) + ((V

≤ 28 V

DC

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

(SRSET)

= 2.5 V) , (V

, all voltages relative to V

DC

(2)

– I

SRP

SRN

- V

(SRP)

- V

(SRP)

(SRN)

= 100 mV) Then I

(SRN)

) – 3 0 3

(unless otherwise specified)

SS

(1)

VCC = SRN, SRP + 2 V 5 30 V

V

= 16 V, (SRP – SRN) = 100 mV,

(SRP)

SRSET = 2.5 V, VCC = 28 (SRP - SRN) = 100 mV, SRSET= 2.5 V,

VCC = 28 V, 0 ≤ TJ≤ 125 ° C

0.65 V ≤ SRSET ≤ 2.5 V, 8 V ≤ SRN ≤ 16 V

SRSET = 1.25 V, TJ= 25 ° C SRSET = 1.25 V SRSET = 2.5 V, TJ= 25 ° C SRSET = 2.5 V

/ 3 k Ω )

(SRP)

(3)

(4)

= I

= 83 A

(SRN)

(4)

70 85 110

– 5% 5% – 6% 6% – 3% 3% – 4% 4%

90 dB

μ A

(3) (4) Total battery-current set is based on the measured value of (SRP – SRN) = Δ m, and the calculated value of (SRP – SRN) = Δ C, using the

measured gain, AV.

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ELECTRICAL CHARACTERISTICS (Continued)

I

AC

+

ACSET

R

SENSE

1

A

V

Dc +

ACSET

A

V

, Totalaccuracy in % +

(

Dm* Dc

)

Dc

100,I

(ACP)

* I

(ACN)

+ 0

– 40 ° C ≤ TJ≤ 125 ° C, 7 V

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

ADAPTER CURRENT-SENSE AMPLIFIER

g

m

CMRR Common-mode rejection ratio See V I

(SINK)

I

IB

V A

BATTERY VOLTAGE ERROR AMPLIFIER

g

m

CMRR Common-mode rejection ratio See V

V

I

(SINK)

V

Transconductance gain 75 130 175 mA/V

Common-mode input voltage range (ACP) 7 V

ICR

Sink current (COMP) COMP = 1 V, (ACP – ACN) = 10 mV 0.5 1.5 2.5 mA Input bias current (ACP, ACN) 40 50 65 Input bias current accuracy ratio ACP = ACN = 28 V, VCC = 28 V,

(I

, I

(ACP)

(ACN)

AC current programming voltage (ACSET) 0 2.5 V

(SET)

AC current set gain 0.65 V ≤ ACSET ≤ 2.5 V, 12 V ≤ ACP ≤ 20 V

V

Total ac current-sense mid-scale accuracy

Total ac current-sense full-scale accuracy ACSET = 2.5 V, TJ= 25 ° C

Transconductance gain 75 135 175 mA/V

BATSET common-mode input voltage

ICR

range Internal reference override input threshold

IT

voltage Sink current COMP 0.5 1.5 2.5 mA

Error-amplifier precision reference voltage TJ= 0 ° C to 85 ° C 1.183 1.196 1.203 V

(FB)

≤ V

DC

) ACSET = 2.5 V, 0 ≤ TJ≤ 125 ° C

≤ 28 V

CC

, all voltages relative to VSS, (unless otherwise specified)

DC

SLUS553E – MAY 2003 – REVISED OCTOBER 2007

(1)

ACP = ACN = 28 V, VCC = 28 V, ACSET = 2.5 V

– 3 0 3

(1)

ACSET = 1.25 V, TJ= 25 ° C ACSET = 1.25 V

ACSET = 2.5 V

(1)

COMP = 1 V, (BATP – BATSET) = 10 mV, BATSET = 1.25 V

TJ= 25 ° C 1.190 1.196 1.202

TJ= – 40 ° C to 125 ° C 1.178 1.196 1.204

(2)

24.5 25.3 26.5 V/V – 5% 5% – 6% 6%

– 3.5% 3.5%

– 4% 4%

1 2.5 V

0.20 0.25 0.35 V

bq24702 bq24703

90 dB

CC

90 dB

V

A

(1) Calculation of the ac current: (2) Total ac-current set accuracy is based on the measured value of (ACP-ACN) = Δ c, using the measured gain, A

V.

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G

TR

+

V

IBAT

(

SRP* SRN

)

bq24702 bq24703

SLUS553E – MAY 2003 – REVISED OCTOBER 2007

ELECTRICAL CHARACTERISTICS (Continued)

– 40 ° C ≤ TJ≤ 125 ° C, 7 V

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

BATTERY CURRENT OUTPUT AMPLIFIER

G V

CM Common-mode input range (SRP) 5 28 V V

T)

I

5-V VOLTAGE REFERENCE

V

HALF SUPPLY REGULATOR

V

Transfer gain (SRP – SRN) = 5 mV

(TR)

Battery current readback output (SRP – SRN) = 5 mV, SRP = 12 V,

I(BAT)

voltage (IBAT) V Line rejection voltage TJ= 25 ° C 10 mV/V

Battery current output voltage

O(IBA

range (IBAT) Output source current (IBAT) (SRP – SRN) = 100 mV 5 7.1 9.4 mA

S(O)

Total battery current readback full-scale accuracy

Output voltage (VREF) TJ= 25 ° C 4.985 5 5.013 V

ref

Line regulation I Load regulation 1 mA ≤ I Short circuit current 8 20 30 mA 5V REF output capacitor Capacitance 2.2 10 μ F Output capacitor equivalent

resistor

Voltage regulation V

(HSP)

≤ V

DC

≤ 28 V

CC

, all voltages relative to V

DC

(1)

= 18 V, TJ= 25 ° C

CC

(SRP – SRN) = 50 mV, TJ= 25 ° C (SRP – SRN) = 50 mV,

0 ° C ≤ TJ≤ 85 ° C (SRP – SRN) = 100 mV,

TJ= 25 ° C (SRP – SRN) = 100 mV,

0 ° C < TJ< 85 ° C

TJ= 0 ° C to 85 ° C 4.946 5 5.013 TJ= 40 ° C to 85 ° C 4.946 5 5.03 V TJ= – 40 ° C to 125 ° C 4.926 5 5.03 V

LOAD

ESR 5 1000 m Ω

I

(SINK)

I

(SINK)

(1)

= 5 mA 0.1 0.37 mV/V

≤ 5 mA 1.1 4 mV/mA

LOAD

= 20 mA, V = 1 mA, V

= 18 V V

CC

= 7 V 1.5

CC

(unless otherwise specified)

SS

20 V/V

100 mV

0 2.5 V

(1)

– 3% 2.4%

– 20% 20%

– 1.5% 1.2%

– 6% 8.5%

CC

– 11 V

CC

– 10.2 V

– 8.5

CC

(1) Battery readback transfer gain

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ELECTRICAL CHARACTERISTICS (Continued)

V

IBATc

+

(

SRP* SRN) GTR Total Accuracy in % +

V

IBATm

* V

IBATc

V

IBATm

100

– 40 ° C ≤ TJ≤ 125 ° C, 7 V

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

MOSFET GATE DRIVE

AC driver R AC driver R Battery driver R Battery driver R

t

da

t

db

V

OH

V

OL

SELECTOR

V

(ACPRES)

V

IT(ACPRES)

t

d(ACPRES)

V

(BATDEP)

V

(NOBAT)

t

(BATSEL)

t

(ACSEL)

V

(VS)

V

IT(VS)

ZERO VOLT OPERATION

r

DS(on)

(1) Total battery current readback accuracy is based on the measured value of V

using the measured value of the transfer gain, GTR.

Time delay from ac driver off to battery driver on

Time delay from battery driver off to ac driver on

PWM driver high-level output voltage

PWM driver R

PWM driver low-level output voltage V

PWM driver R

AC presence detect voltage V

AC presence hysteresis 1% Deglitch delay for adapter insertion 100 μ s

Battery depletion ALARM trip voltage

No battery detect, switch to ACDRV bq24702 only

Battery select time (ACSEL low to VS < BATP, 50% threshold, ACSEL BATDRV low) 2.4 V ↓ 0.2 V

AC select time (ACSEL high to ACDRV low)

VS voltage to enable BATDRV BATP = 1 V 0.98 1 1.02 V VS voltage hysteresis VS > BATP 20 35 85 mV

Static drain source on-state resistance

Zero volt operation threshold V

≤ V

DC

CC

high V

DS(on)

low V

DS(on)

DS(on) DS(on)

high 7 14 Ω

DS(on)

low 5 8.5 Ω

DS(on)

(2)

≤ 28 V

, all voltages relative to V

DC

high V low V

SS

CC CC CC CC

= 18 V, I = 18 V, I = 18 V, I = 18 V, I

= 1 mA 85 150 Ω

( ACDRV)

= 1 mA 55 110 Ω

( ACDRV) ( BATDRV) ( BATDRV)

= 1 mA 315 600 Ω = 1 mA 70 115 Ω

ACSEL 2.4 V ^ 0.2 V 1.2 2 μ s

ACSEL 0.2 V $ 2.4 V 2.4 3.3 μ s IO= – 10 mA, VCC = 18 V V

IO= – 50 mA, VCC = 18 V V

IO= 10 mA, VCC = 18 V V IO= 50 mA, VCC = 18 V V

– 40 ° C to 85 ° C 1.208 1.246 1.285

(1)

See – 40 ° C to 85 ° C 1.208 1.246 1.285

(1)

– 40 ° C to 85 ° C 0.880 1 1.118

ACSEL 0.2 V ↑ 2.4 V 1 2.5 5 μ s

V

= 7 V, TJ= 125 ° C, IO= 100 mA 5.3 8.7 Ω

CC

BATDEP increasing 0.743 0.794 0.840 BATDEP decreasing 0.570 0.62 0.656

(unless otherwise specified)

, V

IBAT

SLUS553E – MAY 2003 – REVISED OCTOBER 2007

CC

– 0.18 V

– 1.2 V

– 0.09

CC

– 0.8

CC

+0.1 V

HSP

+0.6 V

HSP

1.194 1.246 1.286

0.869 1 1.144 V

1 2.5 3.5 μ s

, and the calculated value of V

IBATm

bq24702 bq24703

V

+0.4

HSP

+1.2

HSP

V

, V

IBAT

,

IBATc

(2) See Table 1 to determine the logic operation of the bq24702 and the bq24703.

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R6

R11

Open

R12

Note1

R14

0.025 R13

R15

C3

C12

35V

U2

SI4435DY

R18

D2

BAS16

ACDRV24

ACN11

12 ACP

1

ACDET

22VCC

20

VHSP

D3

13 V

21

SRP

C6

16V

C7

35 V

PWM

L1

U3

SI4435DY R20

SRN

D5

Note 1

D6

Note 1

R22

R23

Note1

R24

R25

Note1

16

15

BATDEP

BATP

4

13

R16

C5

C4

150pF

10COMP

D1

MBRD640CTT4

D4

MBRD640CTT4

C11

35 V

R21

Note1

R19

Note1

C8

U4

SI4435DY

D9 BAS16

R26 100K

BATDRV

23

SYSTEM

R27

R28

Note1

Battery Plus

VS 18

AC Adapter

VREF7

ENABLE

ACSEL3

8

19 ALARM

ACPRES

2

C1

ENABLE

ACSEL

ALARM

ACPRES

5

6

SRSET

ACSET

R2

R10

Note1

R8

Note1

C10

180pF

14 IBAT

C13

1 nF

IBAT

R29

17

GND

9BATSET BATSET

100 kΩ

100 Ω

1µ

F

100 Ω

10Ω

33µ

H

4.7µ

F

1µ

F

0.025 Ω

22µ

F

100 Ω

4.7µ

F

604 kΩ

Connect to GND

to Disable

100 kΩ

30 kΩ

4.7µ

F

Note 1: R8 Sets AC Adapter Current Limit

R10 Sets Charge Current

R12 Sets AC ADAPTER Current Limit

R23 Sets the Battery Depleted Threshold

R25 Sets the Charge Regulation Voltage

R28 Sets System Break Before Make

R19 = R21, Sets Zero Volt Charge Current

bq24703

bq24702

Note1

604 kΩ

Note1

C11 Optional, See Application Notes

C12 For Value, See Application Notes

C8 Value Depends on R21 and R19, See Application Notes

D5, D6 Refer to the Application Section

PROCESSOR’S

POWER SUPPLY

bq24702 bq24703

SLUS553E – MAY 2003 – REVISED OCTOBER 2007

APPLICATION DIAGRAM

CHIPSET-IC.COM

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www.ti.com

UDG-00137

20

VHSP

REGULATOR

22

VCC

7

VREF

VOLTAGE

REFERENCE

VREF

ACPRES

2ACPRES

+

1ACDET

ACPRES

HYST

LEVEL

SHIFT

S Q

QR

PWM

LOGIC

OSC

21

HIGH-SIDE

DRIVE

300 kHz

+

3ACSEL

8ENABLE

VCC

VHSP

10COMP

5 V

100µA

+

5 V

SRN

+

2 k

Ω

12ACP

11ACN

+

6ACSET

25

k

Ω

VCC

ac

CURRENT

ERROR

AMPLIFIER

BATTERY

CURRENT

ERROR

AMPLIFIER

BATTERY VOLTAGE

ERROR

AMPLIFIER

+

13

PWM

BATP

9 BATSET

16 SRP

2 k

Ω

15 SRN

5 SRSET

25 k

Ω

0.25 V

BATTERY

SELECT

DRIVE

ADAPTER

SELECT

DRIVE

+

24

VCC

VHSP

VCC

23 BATDRV

BATTERY SELECT

LOGIC

AND

ANTI-CROSS

CONDUCT

+

NO BATTERY

COMPARATOR

17 GND

+

A=20

VCC

14 IBAT

SRP SRN

ACSEL

ACPRES

+

SWITCH TO BATTERY

4BATDEP

+

DEPLETED

BATTERY

COMPARATOR

BATP

18VS

2

1

ACDRV

ACSEL

bq24702 ONLY

bq24703 ONLY

19ALARM

2 V

+

BATDA

VTBD

Zero Volt

Charging

V

ACPRES

V

FB

0.8 x V

NOBAT

V

BATDEP

bq24702 bq24703

SLUS553E – MAY 2003 – REVISED OCTOBER 2007

BLOCK DIAGRAM

CHIPSET-IC.COM

Product Folder Link(s): bq24702 bq24703

www.ti.com

bq24702 bq24703

SLUS553E – MAY 2003 – REVISED OCTOBER 2007

Table 1. TERMINAL FUNCTIONS

TERMINAL

NAME

ACDET 1 26 I AC or adapter power detection ACDRV 24 25 O AC or adapter power source selection output ACN 11 8 I Negative differential input ACP 12 9 I Positive differential input ACPRES 2 27 O AC power indicator ACSEL 3 28 I AC adapter power select ACSET 6 3 I Adapter current programming voltage ALARM 19 19 O Alarm output BATDEP 4 1 I Depleted battery level BATDRV 23 24 O Battery power source select output BATP 13 12 I Battery charge regulation voltage measurement input to the battery-voltage gmamplifier BATSET 9 6 I External override to an internal precision reference COMP 10 7 O Inverting input to the PWM comparator ENABLE 8 5 I Charge enable GND 17 17 O Supply return and ground reference IBAT 14 13 O Battery current differential amplifier output PWM 21 21 O Gate drive output SRN 15 15 I Negative differential battery current sense amplifier input SRP 16 16 I/O Positive differential battery current sense amplifier input SRSET 5 2 I Battery charge current programming voltage VCC 22 22 I Operational supply voltage VHSP 20 20 O Voltage source to drive gates of the external MOSFETs VREF 7 4 O Precision 5-V reference VS 18 18 I System (load) voltage input pin

bq24702 bq24703

(PW) (QFN)

I/O DESCRIPTION

PIN ASSIGNMENTS

ACDET: AC or adapter power detection. This input pin is used to determine the presence of the ac adapter.

When the voltage level on the ACDET pin is less than V PWM control is disabled, the BATDRV is driven low, and the ACDRV is driven high. This feature can be used to automatically select battery as the system power source.

ACDRV: AC or adapter power source select output. This pin drives an external P-channel MOSFET used to switch to the ac wall-adapter as the system power source. When the ACSEL pin is high while the voltage on the ACDET pin is greater than V when the ACDET is less than V

, the output ACDRV pin is driven low (V

ACPRES

.

ACPRES

ACN, ACP: Negative and positive differential inputs, respectively for ac-to-dc adapter current sense resistor. ACPRES: This open-drain output pin is used to indicate the presence of ac power. A logic high indicates there is

a valid ac input. A low indicates the loss of ac power. ACPRES is high when the voltage level on the ACDET pin is greater than V

.

ACPRES

CHIPSET-IC.COM

ACSEL: AC adapter power select. This input selects either the ac adapter or the battery as the power source. A logic high selects ac power, while a logic low selects the battery.

ACSET: Adapter current programming voltage. This input sets the system current level at which dynamic power management occurs. Adapter currents above this programmed level activate the dynamic power management and proportionally reduce the available power to the battery.

Product Folder Link(s): bq24702 bq24703

, the bq24702/bq24703 is in sleep mode, the

ACPRES

). This pin is driven high (V

HSP

)

CC

Texas Instruments bq24702, bq24703 Datasheet

Specifications and Main Features

Frequently Asked Questions

User Manual

FEATURES

DESCRIPTION

DESCRIPTION (CONTINUED)

DISSIPATION RATINGS

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED OPERATING CONDITIONS

ELECTRICAL CHARACTERISTICS

ELECTRICAL CHARACTERISTICS (Continued)

ELECTRICAL CHARACTERISTICS (Continued)

ELECTRICAL CHARACTERISTICS (Continued)

ELECTRICAL CHARACTERISTICS (Continued)

PIN ASSIGNMENTS