Texas Instruments TPS60250RTETG4, TPS60250 Datasheet

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95

90

85

80

75

70

65

60

55

50

3 3.5

4 4.5 5 5.5

6

V -InputVoltage-V

I

Efficiency-%

4MainLED-15mA,
V =3.1V

F

C1-

C2+

C2-

C1+

DM1

DM5

DS2

DS1

DM3DM4 DM2

GND

SDAT

SCLKVIN

C1
1mF

C2
1mFC31mF

MainDisplay

C4

4.7mF

SubDisplay

I2CInterface

On/Off, DigitalDimming

VOUT

HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I2C INTERFACE

FEATURES DESCRIPTION

• 3.0-V to 6.0-V Input Voltage Range

• × 1 and × 1.5 Charge Pump

• Fully Programmable Current with I2C

– 64 Dimming Steps with 25mA Maximum

(Sub and Main Display Banks)

– 4 Dimming Steps with 80mA Maximum

(DM5 for Auxiliary Application)

• 2% Current Matching for Sub LEDs at Light
Load Condition (Each 100 µ A)

• 750-kHz Charge Pump Frequency

• Continuous 230-mA Maximum Output Current

• Auto Switching Between × 1 and × 1.5 Mode for

Maximum Efficiency

• Built-in Soft Start and Current Limit

• Open Lamp Detection

• 16-Pin 3mm x 3mm QFN

APPLICATIONS

• Cellular Phones

• PDA, PMP, GPS (Up To 4 Inch LCD Display)

• Multidisplay Handheld Devices

TPS60250

SLVS769 – APRIL 2007

The TPS60250 is a high efficiency, constant
frequency charge pump DC/DC converter that uses a
dual mode 1 × and 1.5 × conversion to maximize
efficiency over the input voltage range. It drives up to
five white LEDs for a main display and up to two
white LEDs for a sub display with regulated constant
current for uniform intensity. By utilizing adaptive
1 × /1.5 × charge pump modes and very low-dropout
current regulators, the TPS60250 achieves high
efficiency over the full 1-cell lithium-battery input
voltage range.

Four enable inputs, ENmain, ENsub1, ENsub2, and
ENaux, available through I2C, are used for simple
on/off controls for the independent main, sub1, sub2,
and DM5 displays, respectively. To lower operating
current when using one sub display LED, the device
provides completely separate operation in sub
display LEDs.

The TPS60250 is available in a 16-pin 3mmx3mm
thin QFN.

Figure 1. Typical Application for Sub and Main Figure 2. Efficiency vs Input Voltage

ORDERING INFORMATION

(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

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.

PART NUMBER PACKAGE T

TPS60250RTE 16 Pin 3 mm × 3 mm QFN (RTE) –40 ° C to +85 ° C

web site at www.ti.com.

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.

(1)

A

Copyright © 2007, Texas Instruments Incorporated

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TPS60250

SLVS769 – APRIL 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.

ABSOLUTE MAXIMUM RATINGS

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

V

T
T
T

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

(2) The Human body model (HBM) is a 100-pF capacitor discharged through a 1.5-k Ω resistor into each pin. The testing is done according
(3) Charged Device Model

(4) Machine Model (MM) is a 200-pF capacitor discharged through a 500-nH inductor with no series resistor into each pin. The testing is

Input voltage range (all pins) –0.3 to 7 V

I

MAX Output current limit 650 mA
HBM ESD Rating
CDM ESD Rating
MM ESD Rating
Operating temperature range –40 to 85 ° C

A

Maximum operating junction temperature 150 ° C

J

Storage temperature –55 to 150 ° C

ST

(2)

(3)

(4)

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.

JEDECs EIA/JESD22-A114.

done according JEDECs EIA/JESD22-A115.

(1)

VALUE UNIT

2 kV
500 V
200 V

DISSIPATION RATINGS

PACKAGE

QFN 3 × 3 RTE 74.6 ° C/W 48.7 ° C/W 2.05 W 1.13 W 0.821 W

THERMAL THERMAL TA≤ 25 ° C POWER DERATING FACTOR TA= 85 ° C POWER

RESISTANCE, R

θ JC

RESISTANCE, R

θ JA

RATING ABOVE TA= 25 ° C RATING

RECOMMENDED OPERATING CONDITIONS

MIN NOM MAX UNIT

V

I

I

O(max)

C

I

C

O

C1, C
T

A

T

J

Input voltage range 3.0 6.0 V
Maximum output current 230 mA
Input capacitor 1.0 µ F
Output capacitor 4.7 µ F
Flying capacitor 1.0 µ F

2

Operating ambient temperature –40 85 ° C
Operating junction temperature –40 125 ° C

ELECTRICAL CHARACTERISTICS

VI= 3.5 V, TA= –40 ° C to 85 ° C, typical values are at TA= 25 ° C (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

SUPPLY VOLTAGE

V

I

I

Q

I

SD

V

UVLO1

V

UVLO2

Input voltage range 3.0 6.0 V

750-kHz Switching in 1.5 × Mode

Operating quiescent current

Shutdown current Enable Control Register has 0x00 1.3 µ A
UVLO Threshold voltage1
UVLO Threshold voltage2

(1)
(2)

(I
No switching in × 1 mode (IO= 100 µ A) 68 µ A

VIfalling 2.2 2.4 2.6 V
VIfalling 1.2 1.3 1.5 V

MAIN_LED

= 15 mA × 4, IO= 60 mA)

6.7 mA

(1) Shut down charge pump and power stage and keep I2C content
(2) Shut down completely and come up with all 0's after device restart

2

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ELECTRICAL CHARACTERISTICS (continued)

VI= 3.5 V, TA= –40 ° C to 85 ° C, typical values are at TA= 25 ° C (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

hys

T

S

CHARGE PUMP

V

out

F

s

R

O

CURRENT SINK

K

m_sub

K

m_main

K

a

I

D_MS

I

D_DM5

V

DropOut

V

TH_GU

V

TH_GD

SERIAL INTERFACE TIMING REQUIREMENTS

f

max

t

wH(HIGH)

t

wL(LOW)

t

r

t

f

t

h(STA)

t

su(STA)

t

h(DATA)

t

su(DATA)

t

su(STO)

t

(BUF)

I2C COMPATIBLE INTERFACE VOLTAGE SPECIFICATION (SCLK, SDAT, VIO)

V

IL

V

IH

V

OL

Under-voltage lockout hysterisis UVLO1 210 mV
Soft start time

(3)

VI= 3 V, CO= 1 µ F,
I

= 15 mA × 4

MAIN_LED

Overvoltage limit 6.5 V
Switching frequency 750 kHz

× 1 Mode, (VI– VO)/I

Open loop output impedance Ω

× 1.5 Mode, (VI× 1.5 – VO)/IOVI= 3.0V (IO=

O

120mA)

Current matching of sub LEDs at light I
load condition

LED to LED Current matching

(4)

(5)

Current accuracy I
Maximum LED current of DM1-4 and

DS1-2

Maximum LED current of DM5 80 mA
LED Drop out voltage See

1 × Mode to 1.5 × mode transition V
threshold voltage

(7)

Input voltage hysteresis for 1.5 × to 1 × Measured as VI– (VO– V
mode transition mA × 4

= 100 µ A × 2, V

SUB_LED

I

= 15 mA × 4,

MAIN_LED

3.0 V ≤ VI≤ 4.2 V
= 15 mA ± 7%

LED

= 0.4 V

DXX

Main and Sub Display Current Register =
0 × 01&2(111111), 25.5 mA
V

= 0.2 V

DXX

Aux Display Current Register = 0 × 03
(XXXX11), V

(6)

Falling, 15 mA × 4 measured on the

DXX

lowest V

= 0.4 V

DM5

DXX

), I

DXX_MIN

MAIN_LED

Clock frequency 400 kHz
Pulse duration, clock high time 600 ns
Pulse duration, clock low time 1300 ns
DATA and CLK rise time 300 ns
DATA and CLK fall time 300 ns
High time (repeated) START

condition(after this period the first clock 600 ns
pulse is generated)

Setup time for repeated START
condition

Data input hold time 0 ns
Data input setup time 100 ns
STOP condition setup time 600 ns
Bus free time 1300 ns

Low-leveI input voltage 3.0V ≤ VI≤ 6.0V 0 0.5 V
High-level input voltage 3.0V ≤ VI≤ 6.0V 1.1 V
Low-level output voltage I

= 2 mA 0.4 V

LOAD

TPS60250

SLVS769 – APRIL 2007

0.5 ms

1.2

3.5 5.0

0 ± 2%

± 1% ± 5%

80 120 mV

85 100 120 mV

= 15

470 mV

600 ns

(3) Measurement Condition: From enabling the LED driver to 90% output voltage after VIis already up.
(4) LED current matching is defined as: (I
(5) LED to LED Current Matching is defined as: (I
(6) Dropout Voltage is defined as V

V

= 0.2 V, WLED current = 15 mA × 4.

DXX

(7) As VIdrops, V

Principle section for details about the mode transition thresholds.

eventually falls below the switchover threshold of 100mV, and TPS60250 switches to 1.5 × mode. See the Operating

DXX

SUB_LED_WORST

(WLED Cathode) to GND voltage at which current into the LED drops 10% from the LED current at

DXX

– I

MAIN_LED_WORST

) / I

AVG_SUB

AVG_SUB

– I

AVG_MAIN

) / I

AVG_MAIN

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C1-

C2+

C2-

C1+

DM1

DM

3

DM4

GND

DM2

VOUT VIN SCLK SDAT

DM5

DS2

DS1

1 2

91012 11

7

8

6

5

3 4

13

14

15

16

QFN16-PINRTE

3mmX3mm

(TOP VIEW)

TPS60250

SLVS769 – APRIL 2007

PIN ASSIGNMENTS

TERMINAL FUNCTIONS

TERMINAL

NAME NO.

VOUT 1 O

VIN 2 I
SCLK 3 I I2C Interface

SDAT 4 I/O I2C Interface
DM5 5 I Current sink input. Connect the cathode of the aux display or the 5th main display white LED to this pin.
DS1 6 I
DS2 7 I
DM1 8 I
DM2 9 I
DM3 10 I
DM4 11 I
GND 12 – Ground
C1– 13 – Connect to the flying capacitor C1
C2+ 14 – Connect to the flying capacitor C2
C2– 15 – Connect to the flying capacitor C2
C1+ 16 – Connect to the flying capacitor C1

I/O DESCRIPTION

Connect the anodes of the sub, main, and aux display white LEDs to this pin. Bypass decouple VOUT to
GND with a 4.7- µ F or greater ceramic capacitor.

Supply voltage input. Connect to a 3-V to 6-V input supply source. Bypass VIN to GND with a 1- µ F or
greater ceramic capacitor.

Current sink input. Connect the cathode of one of the sub display white LEDs to this pin.

Current sink input. Connect the cathode of one of the main display white LED to this pin.

4

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FUNCTIONAL BLOCK DIAGRAM

5

DM5

6

DS1

7 DS2

11 10 9 8

DM 4 DM 3 DM 2 DM 1

GEAR

CONTROL

&
OPENLAMP
DETECTION

1X, 1.5XCHARGEPUMP

1

VOUT

13141516

C

1

-

C

2

+

C

2

-

C

1

+

2

VIN

I2C

INTERFACE

ENmain

MainDimming

ENsub 1

ENsub 2

SubDimming

ENaux

AUXDimming

SCLK

SDAT 4

3

6

6

6

12 GND

BIAS, TEST,& MONITORING

ENold

TPS60250

SLVS769 – APRIL 2007

TABLE OF GRAPHS

Efficiency

Output Impedance of × 1
and × 1.5 Mode

Shutdown Current Shutdown Current vs Input Voltage Figure 9
Input Current Input Current vs Supply Voltage, 4 Main LED Figure 10

Efficiency vs Input Voltage, 4 Main LED - 15mA, 25mA Figure 3
Efficiency vs Input Voltage, 2 Sub LED with Light Load Condition, × 1 Mode Operation Figure 4
Switch Resistance vs Free-Air Temperature, × 1 Mode, I
Switch Resistance vs Free-Air Temperature, × 1 Mode, I
Switch Resistance vs Free-Air Temperature, × 1.5 Mode Charge Pump Open-Loop , I
Switch Resistance vs Free-Air Temperature, × 1.5 Mode Charge Pump Open-Loop, I

TYPICAL CHARACTERISTICS

DESCRIPTION REF

= 230 mA Figure 5

LED

= 100 mA Figure 6

LED

= 230 mA Figure 7

LED

= 100 mA Figure 8

LED

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90

80

70

60

50

Efficiency-%

3 4 5 6

V -InputVoltage-V

I

15mA,V =3.43V

F

25mA,V =3.79V

F

100

80

40

60

20

Efficiency-%

3 4 5 6

V -InputVoltage-V

I

0.2mA,V =2.6V

F

1mA,V =2.8V

F

0.5mA,V =2.7V

F

-40 -20 0 20 40 60 80

0.65

0.70

0.75

0.80

0.85

0.90

0.95

1

1.05

1.10

SwitchResistance- W

T -Free-AirTemperature-°C

A

I

LED

=100mA

V =3.6V

I

V =3.9V

I

V =3.3V

I

-40 -20 0 20 40 60 80

0.70

0.75

0.80

0.85

0.90

0.95

1

1.05

1.10

1.15

T -Free-AirTemperature-°C

A

V =3.6V

I

V =3.9V

I

I

LED

=230mA

V =3.3V

I

SwitchResistance- W

TPS60250

SLVS769 – APRIL 2007

TYPICAL CHARACTERISTICS (continued)

DESCRIPTION REF

DM5 with Maximum 80
mA

Current Accuracy WLED Current vs Input Voltage, 4 Main LED with 15 mA Figure 12

DM5 Current vs Input Voltage, Programmed with 80 mA Figure 11

EFFICIENCY vs

vs INPUT VOLTAGE

INPUT VOLTAGE (2 Sub LED with Light Load Condition,
(4 Main LED - 15mA, 25mA) × 1 Mode Operation)

Figure 3. Figure 4.

SWITCH RESISTANCE SWITCH RESISTANCE

vs vs

FREE-AIR TEMPERATURE FREE-AIR TEMPERATURE

( × 1 Mode) ( × 1 Mode)

EFFICIENCY

6

Figure 5. Figure 6.

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-40

-20

0

20

40 60 80

2.8

3

3.2

3.4

3.6

3.8

I

LED

=230mA

V =3V

I

SwitchResistance- W

T -Free-AirTemperature-°C

A

-40 -20 0 20 40 60 80

2.6

2.8

3

3.2

3.4

3.6

3.8

SwitchResistance-

W

T -Free-AirTemperature-°C

A

I

LED

=100mA

V =3V

I

0.16

0.15

0.14

0.13

0.12

0.11

0.10

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

I

-InputCurrent- A

CC

3

4

5

6

V -InputVoltage-V

I

25mA

15mA

2mA

10

8

6

4

2

0

ShutdownCurrent- Am

3

4

5

6

V -InputVoltage-V

I

T =85°C

A

T =25°C

A

T =-40°C

A

TPS60250

SLVS769 – APRIL 2007

SWITCH RESISTANCE SWITCH RESISTANCE

vs vs

FREE-AIR TEMPERATURE FREE-AIR TEMPERATURE

( × 1.5 Mode Charge Pump Open-Loop) ( × 1.5 Mode Charge Pump Open-Loop)

Figure 7. Figure 8.

INPUT CURRENT

SHUTDOWN CURRENT vs

vs SUPPLY VOLTAGE

INPUT VOLTAGE (4 Main LED)

Figure 9. Figure 10.

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