TOKO TK65433MTL, TK65430MTL, TK65425MTL, TK65427MTL, TK65424MTL Datasheet

ADVANCED INFORMATION

V

OUT

LBO

V

IN

SW

GND

LBI/SB

TK654xx

ADVANCED

STEP-DOWN CONVERTER WITH BATTERY MONITOR

INFORMATION

FEATURES

■ Minimum External Component Count (1 coil, 1 cap)

■ Miniature 6 Pin SOT23L-6 Surface Mount Package

■ Up To 95% Efficient

■ Extremely Low Operating Current (24 µA)

■ Low Quiescent Current (18 µA)

■ Low Ripple

■ Fast Transient Response

■ Linear Dropout Characteristics

■ Short Circuit Protection

■ Regulates Down to 1.8 V

■ Synchronous Rectification

■ Internal Battery Monitor

DESCRIPTION

The TK654xx low power step-down converter is designed
for portable battery systems, capable of operating from a
single Li-ion battery cell or multiple alkaline or rechargeable
(NiCd or NiMH) battery cells (up to 6 V). The TK654xx
provides the power switch, synchronous rectifier, and the
control circuit for a buck step-down converter. Only two
external components are required to complete the step­down conversion.

APPLICATIONS

■ Battery Powered Systems

■ Cellular Telephones

■ Pagers

■ Personal Communications Equipment

■ Radio Controlled Systems

■ Toys

Driving the SB pin low will disable the TK654xx and drop
the quiescent current on the input supply to approximately
18 µA.

Pulse Current Amplitude control is used to regulate the
voltage at the V
of the TK654xx drops below the regulation threshold, a
current pulse is transferred from the input supply to the
output. The TK654xx utilizes a proprietary control scheme,
where the average amplitude of the current pulse is varied
depending upon the current loads. The proprietary
architecture allows fast transient response and minimal
ripple while maintaining ease-of-use and low component
count.

The TK654xx is available in a miniature 6-pin SOT23L-6
surface mount package.

pin of the IC. When the output voltage

OUT

TK654xxM

The TK654xx provides laser-trimmed output voltages
ranging from 1.8 V to 3.3 V. The low resistance MOSFET
switch and synchronous rectifier allow average currents
up to 200 mA, while maintaining peak efficiencies up to
95%. A low-battery threshold and turn-off threshold can
be individually programmed by the user, utilizing a single
resistor divider connected to the Low Battery Input (LBI)
pin. When the resistively-divided supply voltage on the
LBI pin drops below approximately 1.22 V, the Low Battery

BLOCK DIAGRAM

Output (LBO) pin will become asserted. The dual-function
LBI pin can alternatively be used as a Standby (SB) pin.

V

IN

ORDERING INFORMATION

V

OUT

REF

LBI/SB

Voltage Code

VOLTAGE CODE

18 = 1.8 V
21 = 2.1 V
24 = 2.4 V
25 = 2.5 V

27 = 2.7 V
30 = 3.0 V
33 = 3.3 V

TK654xxM

Tape/Reel Code

TAPE/REEL CODE

TL: Tape Left

September 1999 TOKO, Inc. Page 1

CONTROL

CIRCUIT

BATTERY
MONITOR

SW

GND

LBOOFF

LBO

TK654xx

ADVANCED INFORMATION

ABSOLUTE MAXIMUM RATINGS

All Pins Except GND ............................................... 6.5 V

Power Dissipation (Note 1) ................................ 400 mW

Storage Temperature Range ................... -55 to +150 °C

Operating Temperature Range ...................-20 to +80 °C

Junction Temperature ...........................................150 °C

Lead Soldering Temperature (10 s.) .....................235 °C

TK654xx ELECTRICAL CHARACTERISTICS

Test conditions: VIN = 5 V, I

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

= 1 mA, T

OUT

= TJ = Full Operating Temperature Range, unless otherwise specified.

A

V

V

∆V
∆V

I

I

V
V

NI

)GER(TUO

)DAOL(TUO

)ENIL(TUO

)TUOV(Q

)NIV(Q

)IBL(HT

)BS(HT

egatloVtupnI26V

TAT=

egatloVtuptuO

J

)2etoN(C°52=%3-V

GER

%3V

%5-%5+V

noitalugeRdaoLI

noitalugeReniLV

VotnitnerruCtnecseiuQ

VotnitnerruCtnecseiuQ

niP

TUO

niPV

NI

dlohserhTtupnIIBLT

dlohserhTybdnatST

NI

V

AT=J

AT=J

DAOL

V=

TUO

)GER(TUO

)3etoN(

V=

TUO

)GER(TUO

C°52=751.122.1282.1V
C°52=751.122.1282.1V

)3etoN(,Am001ot0=54021Vm

)3etoN(,V6ot4=602Vm

Vm05+

0105Aµ

P

Vm05+5156Aµ

3etoN0An

I

)BS(B

I

)XAM(TUO

I

)CS(TUO

I

)VNOC(Q

I

YBTS

FFEycneiciffEretrevnoC

V

PORD

Note 1: Power dissipation is 400 mW when mounted as recommended. Derate at 3.2 mW/°C for operation above 25 °C. Power dissipation is 200
mW in Free Air. Derate at 1.6 mW/°C for operation above 25 °C
Note 2: V
Note 3: When using test circuit.
Note 4: When using test circuit and ramping VIN down.
Note 5: When using test circuit with SB pin resistors removed and tied to VIN. (VIN = 1.8 V)
Note 6: When using test circuit with SB pin resistors removed and tied to VIN. (VIN = 3.3 V)

= 3.3, 3.0, 2.7, 2.5, 2.4, 2.1, 1.8 V.

REG

tnerruCsaiBtupnIBS

V(ta4etoN

)BS(HT

)Vm001-0040270001An

tnerruCtuptuOmumixaM)3etoN(001Am

tnerruCtiucriCtrohS)3etoN(052Am

tnerruCtnecseiuQretrevnoCI)3etoN(

TUO

Am0=4209Aµ

tnerruCybdnatSretrevnoCnepo1niP,V0=nipBS8156Aµ

I

TUO

TAT=

J

I

TUO

TAT=

J

I

TUO

TAT=

egatloVtuoporD

I

TAT=

J

TUO

J

)3etoN(,Am05=

)81456KT(C°52=

)3etoN(,Am05=

)33456KT(C°52=

)5etoN(,Am05=

)6etoN(,Am05=

6819%

0959%

)81456KT(C°52=

)33456KT(C°52=

001591Vm

57541Vm

Page 2

September 1999 TOKO, Inc.

ADVANCED INFORMATION

TK654xx

1.820

1.815

I

Q(CONV)

V

= 5 V

IN

C

3

10 µF

I

OUT

V

OUT

C

10 µF

1

C

10 µF

+

2

TEST CIRCUIT

R

3

300 K

I

Q(VOUT)

L

1

100 µH

V

LBO

OUT

SW

LBI/SB

GND

V

IN

L

1

C1,C3: Ceramic 10 µF
C2: Tantalum 10 µF

TYPICAL PERFORMANCE CHARACTERISTICS

USING TEST CIRCUIT

TK65418

LINE REGULATION

I

= 1 mA

OUT

3.330

3.325

R

1

634 K

R

2

287 K

I

Q(VIN)

: Toko D10F Coil, PN A814AY-101K

L1:

TK65433

LINE REGULATION

I

= 1 mA

OUT

1.810

(V)

1.805

OUT

V

1.800

1.795

1.790

2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
V

(V)

IN

TK65418

LOAD REGULATION

1.82

VIN = 5 V

1.80

(V)

OUT

V

1.78

1.76
0 20 40 60 80 100 120

I

(mA)

OUT

3.320

(V)

3.315

OUT

V

3.310

3.305

3.300

3.4 3.8 4.2 4.6 5.0 5.4 5.8 6.0
V

(V)

IN

TK65433

3.35

LOAD REGULATION

3.3

(V)

OUT

V

3.25

3.2
0 20 40 60 80 100 120 140 160

I

(mA)

OUT

VIN = 5 V

September 1999 TOKO, Inc. Page 3

TK654xx

ADVANCED INFORMATION

TYPICAL PERFORMANCE CHARACTERISTICS

USING TEST CIRCUIT (CONT.)

LOAD AND TEMPERATURE

TK65418

1.90

REGULATION

1.88

1.86

1.84

(V)

OUT

V

1.82

1.8

1.78

1.76

I

OUT

= 1 mA

I

OUT

I

OUT

= 100 mA

= 50 mA

1.74

1.72

-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)

TK65418

EFFICIENCY vs.

OUTPUT CURRENT

100

90
80
70

60
50

40

30

EFFICIENCY (%)

20
10

0

0 20 40 60 80 100 120

I

(mA)

OUT

LOAD AND TEMPERATURE

TK65433

3.55

REGULATION

3.45

I

= 50 mA

I

OUT

OUT

= 1 mA

(V)

OUT

V

3.35

3.25

3.15

3.05

-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)

TK65433

EFFICIENCY vs.

OUTPUT CURRENT

100

90
80
70

60
50

40

30

EFFICIENCY (%)

20
10

0

0 40 80 120 160

I

(mA)

OUT

I

OUT

= 100 mA

Page 4

EFFICIENCY vs. TEMPERATURE

100

TK65418

95

I

= 50 mA

90

OUT

85

EFFICIENCY (%)

80

75

-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)

EFFICIENCY vs. TEMPERATURE

99
97

95

TK65433

I

OUT

= 50 mA

93
91

EFFICIENCY (%)

89
87

85

-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)

September 1999 TOKO, Inc.

TYPICAL PERFORMANCE CHARACTERISTICS

CONVERTER QUIESCENT
INPUT SUPPLY VOLTAGE

26

25.5
25

24.5

(µA)

24

23.5

Q(CONV)

I

23

22.5
22

2 3 4 5 6

CONVERTER QUIESCENT

200

150

TK65418

CURRENT vs.

VIN (V)

TK65418

CURRENT vs.

TEMPERATURE

ADVANCED INFORMATION

USING TEST CIRCUIT (CONT.)

No Load

No Load

26

25.5
25

24.5

(µA)

24

23.5

Q(CONV)

I

23

22.5
22

3.5 4 4.5 5 5.5 6

200

150

CONVERTER QUIESCENT
INPUT SUPPLY VOLTAGE

CONVERTER QUIESCENT

TK65433

CURRENT vs.

VIN (V)

TK65433

CURRENT vs.

TEMPERATURE

No Load

No Load

TK654xx

(µA)

100

Q(CONV)

I

50

0

-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)

TK65418

STANDBY CURRENT vs.

INPUT SUPPLY VOLTAGE

25

20

(µA)

15

STBY

I

10

5

2 2.5 3 3.5 4 4.5 5 5.5 6

VIN (V)

(µA)

100

Q(CONV)

I

50

0

-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)

STANDBY CURRENT vs.

INPUT SUPPLY VOLTAGE

25

20

(µA)

15

STBY

I

10

5

2 2.5 3 3.5 4 4.5 5 5.5 6

TK65433

VIN (V)

September 1999 TOKO, Inc. Page 5

TK654xx

ADVANCED INFORMATION

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TK65418

STANDBY CURRENT vs.

80

60

(µA)

40

STBY

I

20

0

-50 -25 0 25 50 75 100 125

350
300

250

(mA)

200

TEMPERATURE

TEMPERATURE (°C)

TK65418

MAX OUTPUT CURRENT vs.

INDUCTOR VALUE

STANDBY CURRENT vs.

80

60

(µA)

40

STBY

I

20

0

-50 -25 0 25 50 75 100 125

MAX OUTPUT CURRENT vs.

350

300

250

(mA)

200

TK65433

TEMPERATURE

TEMPERATURE (°C)

TK65433

INDUCTOR VALUE

150

OUT(MAX)

I

100

50

0

60 90 120 150 180

INDUCTOR VALUE (µH)

150

OUT(MAX)

I

100

50

0

60 90 120 150 180

INDUCTOR VALUE (µH)

Page 6

September 1999 TOKO, Inc.

ADVANCED INFORMATION

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

USING RIPPLE TEST CIRCUIT

V

= 5 V

IN

C

3

V

OUT

10 µF

L

1

+

C

2

100 µH

C

1

LBO

OPEN

V

OUT

SW

LBI/SB

GND

V

IN

L1: Toko D10F Coil, PN A814AY-101K
C1 = See Figure Below
C2 = Tantalum 10 µF
C3 = Ceramic 10 µF

TK654xx

PEAK TO PEAK RIPPLE VOLTAGE

RIPPLE vs. OUTPUT CURRENT

70
60

50
40

30

RIPPLE (mV)

20
10

0

0 20 40 60 80 100

C2 = 10 µF Tantalum

C1 = 10 µF

I

OUT

C1 = 20 µF

C1 = 80 µF

(mA)

C1 = 50 µF

September 1999 TOKO, Inc. Page 7

TK654xx

ADVANCED INFORMATION

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

STARTUP TRANSIENT WAVEFORMS

TK65418 - Power Up No Load

TK65418 - Power Up 100mA Load

Output Voltage (1V / div)

Inductor Current (100mA / div)

Output Voltage (1V / div)

1.8V

0.0V

200mA

0mA

1.8V

0.0V

200mA

TK65433 - Power Up No Load

3.3V

Output Voltage (2V / div)

0.0V

200mA

Inductor Current (100mA / div)

0mA

TK65433 - Power Up 100mA Load

3.3V

Output Voltage (2V / div)

0.0V

Inductor Current (100mA / div)

200mA

Page 8

Inductor Current (100mA / div)

TK65418 - Power Up using SB Pin (100mA Load)

Output Voltage (1V / div)

Inductor Current (100mA / div)

0mA

1.8V

0.0V

200mA

0mA

0mA

TK65433 - Power Up using SB Pin (100mA Load)

3.3V

Output Voltage (2V / div)

0.0V

Inductor Current (100mA / div)

200mA

0mA

September 1999 TOKO, Inc.

ADVANCED INFORMATION

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TURN OFF TRANSIENT WAVEFORMS

TK654xx

TK65418 - Power Down using SB Pin (100mA Load)

Output Voltage (1V / div)

Inductor Current (100mA / div)

LOAD TRANSIENT RESPONSE WAVEFORMS

TK65418 - Transient Load (0mA to 100mA Step)

Output Voltage (50mV / div)

Inductor Current (100mA / div)

1.8V

0.0V

200mA

0mA

200mA

TK65433 - Power Down using SB Pin (100mA Load)

3.3V

Output Voltage (2V / div)

0.0V

200mA

Inductor Current (100mA / div)

0mA

TK65433 - Transient Load (0mA to 100mA Step)

Output Voltage (50mV / div)

Inductor Current (100mA / div)

200mA

TK65418 - Transient Load (100mA to 0mA Step)

Output Voltage (50mV / div)

Inductor Current (100mA / div)

0mA

TK65433 - Transient Load (100mA to 0mA Step)

Output Voltage (50mV / div)

200mA

Inductor Current (100mA / div)

0mA

0mA

200mA

0mA

September 1999 TOKO, Inc. Page 9