Texas Instruments TPS5102IDBTR, TPS5102IDBT, TPS5102EVM-135 Datasheet

TPS5102

DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER

SLVS239 - SEPTEMBER 1999

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D

Dual, Step-Down for Notebook System
Power

D

4.5 V to 25 V Input Voltage Range

D

Adjustable Output Voltage

D

95% Efficiency Achievable

D

PWM/Skip Mode Control Maintains High
Efficiency Under Light Load Conditions

D

Fixed-Frequency Operation

D

Resistorless Current Protection

D

Fixed High-Side Driver Voltage

D

Low Quiescent Current (0.6 mA, <1 µA for
Standby)

D

Small 30-Pin TSSOP

D

EVM Available (TPS5102EVM-135)

description

The TPS5102 is a dual, high efficiency controller designed for notebook system power requirements. Under light
load conditions, high efficiency is maintained as the controller switches from the PWM mode to the lower
frequency Skip mode.

These two operating modes, along with the synchronous-rectifier drivers, dead-time, and very low quiescent
current, allow power to be conserved and the battery life extended, under all load conditions.

The resistor-less current protection and fixed high-side driver voltage simplify the system design and reduce
the external parts count. The wide input voltage range and adjustable output voltages allow flexibility for using
the TPS5102 in notebook power supply applications.

Copyright  1999, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of 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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30
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27
26
25
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23
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21
20
19
18
17
16

INV1

FB1

SOFTSTART1

PWM_SKIP

C

T

R

T

GND

REF
STBY1
STBY2

V

CC

COMP

SOFTSTART2

FB2

INV2

LH1
OUT1_u
LL1
OUT1_d
OUTGND1
TRIP1
VCC_CNTP
TRIP2
VREF5
REG5V_IN
OUTGND2
OUT2_d
LL2
OUT2_u
LH2

DBT PACKAGE

(TOP VIEW)

R6

R4

R2

R1

D2

C11

C9

C8

C6

C5

C2

U1

TPS5102DBT

G

ND

+

C1

C3

C4

C7

C10

D1

R3

R5

R7

5 V

Vo1

L1

Q1

R8

+

C12

Q4

R11

R10

R9

Q3

Q2

L2

Vo2

+

C13

TPS5102
DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER

SLVS239 - SEPTEMBER 1999

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

functional block diagram

To Channel 2

VREF5

_
+

4.5 V

_

+

REF

To
Channel 2

UVLO

3.8 V

OSC

To Channel 2

_

+

To
Channel 2

1.1 V

To

Channel 2

Sync.

Signal

1 Shot

SOFTSTART

_
+

Skip Comp

_
+

+

Error Amp

_
+

1.185 V

_

+

To

Channel 2

PWM Comp

STNBY2

REG5V_IN

V

CC

STNBY1

VREF5

REF

COMP

PWM/SKIP

SOFTSTART

INV

FB

RT
CT

LH
OUT_U
LL

OUT_D
OUTGND

VCC_CNTP

TRIP

1.185 V

TPS5102

DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER

SLVS239 - SEPTEMBER 1999

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

AVAILABLE OPTIONS

T

A

PACKAGE EVM

TSSOP(DBT)

–40°C to 85°C TPS5102IDBT TPS5102EVM-135

TPS5102IDBTR

Terminal Functions

TERMINAL

NAME NO.

I/O

DESCRIPTION

COMP 12 I/O Voltage monitor comparator input
C

T

5 I/O External capacitor connection for switching frequency adjustment
FB1 2 O CH1 error amp output
FB2 14 O CH2 error amp output
GND 7 Control GND
INV1 1 I CH1 inverting input
INV2 15 I CH2 inverting input
LH1 30 I/O CH1 boost capacitor connection
LH2 16 I/O CH2 boost capacitor connection
LL1 28 I/O CH1 boost circuit connection
LL2 18 I/O CH2 boost circuit connection
OUT1_d 27 I/O CH1 low-side gate-drive output
OUT2_d 19 O CH2 low-side gate-drive output
OUT1_u 29 O CH1 high-side drive output
OUT2_u 17 O CH2 high-side drive output
OUTGND1 26 Output GND 1
OUTGND2 20 Output GND 2
PWM_SKIP 4 I PWM/SKIP mode select

L:PWM mode H:SKIP mode
REF 8 O 1.185-V reference voltage output
REG5V_IN 21 I External 5-V input
R

T

6 I/O External resistor connection for switching frequency adjustment
SOFTSTAR T1 3 I/O External capacitor connection for CH1soft start timing.
SOFTSTAR T2 13 I/O External capacitor connection for CH2 soft start timing.
STBY1 9 I CH1 stand-by control
STBY2 10 I CH2 stand-by control
TRIP2 23 I External resistor connection for CH2 over current protection.
TRIP1 25 I External resistor connection for CH1 over current protection.
V

CC

11 Supply voltage input

V

ref

5 22 O 5-V internal regulator output

VCC_CNTP 24 I Supply voltage sense input

TPS5102
DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER

SLVS239 - SEPTEMBER 1999

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

detailed description

Vref (1.185 V)

The reference voltage is used to set the output voltage and the overvoltage protection (COMP).

Vref5 (5 V)

The internal linear voltage regulator is used for the high-side driver bootstrap voltage. Since the input voltage
range is from 4.5 V to 25 V, this feature offers a fixed voltage for the bootstrap voltage greatly simplifying the
drive design. It is also used for powering the low side driver. The tolerance is 6%.

5-V Switch

If the internal 5 V switch senses a 5-V input from REG5V_IN pin, the internal 5-V linear regulator will be
disconnected from the MOSFET drivers. The external 5 V will be used for both the low-side driver and the high
side bootstrap, thus increasing the efficiency.

PWM/SKIP

This pin is used to change between PWM and Skip mode. If the pin is lower than 0.5-V , the IC is in regular PWM
mode; if a minimum 2-V is applied to this pin, the IC works in Skip mode. In light load condition (<0.2 A), the
skip mode gives a short pulse to the low-side FET instead of a full pulse. By this control, switching frequency
is lowered, reducing switching loss; also the output capacitor energy discharging through the output inductor
and the low-side FET is prevented. Therefore, the IC can achieve high efficiency at light load conditions
(< 0.2 A).

err-amp

Each channel has its own error amplifier to regulate the output voltage of the synchronous-buck converter. It
is used in the PWM mode for the high output current condition (>0.2A). Voltage mode control is applied.

skip comparator

In Skip mode, each channel has its own hysteretic comparator to regulate the output voltage of the
synchronous-buck converter. The hysteresis is set internally and typically at 8.5 mV. The delay from the
comparator input to the driver output is typically 1.2 µs.

low-side driver

The low-side driver is designed to drive low-Rds(on) n-channel MOSFETs. The maximum drive voltage is 5 V
from Vref5. The current rating of the driver is typically 1 A, source and sink.

high-side driver

The high side driver is designed to drive low-Rds(on) n-channel MOSFETs. The current rating of the driver is
1 A, source and sink. When configured as a floating driver, the bias voltage to the driver is developed from V ref5,
limiting the maximum drive voltage between OUT_u and LL to 5 V. The maximum voltage that can be applied
between LHx and OUTGND is 30 V.

deadtime control

Deadtime prevents shoot–through current from flowing through the main power FETs during switching
transitions by actively controlling the turn-on time of the MOSFETs drivers. The typical deadtime from
low-side-driver-off to high-side-driver-on is 70 ns, and 85 ns from high-side-driver-off to low-side-driver-on.

TPS5102

DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER

SLVS239 - SEPTEMBER 1999

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

detailed description (continued)

current protection

Current protection is achieved by sensing the high-side power MOSFET drain-to-source voltage drop during
on-time at VCC_CNTP and LL. An external resistor between Vin and TRIP pin in serial with the internal current
source adjusts the current limit. When the voltage drop during the on-time is high enough, the current
comparator triggers the current protection and the circuit is reset. The reset repeats until the over-current
condition is removed.

COMP

COMP is an internal comparator used for any voltage protection such as the output under-voltage protection
for notebook power applications. If the core voltage is lower than the setpoint, the comparator turns off both
channels to prevent the notebook from damage.

SOFT1, SOFT2

Separate softstart terminals make it possible to set the start-up time of each output for any possibility.

STBY1, STBY2

Both channels can be switched into standby mode separately by grounding the STBY pin. The standby current
is as low as 1 µA.

ULVO

When the input voltage goes up to about 4 V, the IC is turned on, ready to function. When the input voltage is
lower than the turn-on value, the IC is turned off. The typical hysteresis is 40 mV.

TPS5102
DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER

SLVS239 - SEPTEMBER 1999

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

absolute maximum ratings over operating free-air temperature (unless otherwise noted)

†

Supply voltage, Vcc (see Note 1) -0.3 V to 27 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage, INV -0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SOFTSTART -0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMP -0.3 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REG5_IN -0.3 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

STBY -0.3 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Driver current 3 A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TRIP -0.3 V to 27 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C

T

-0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RT -0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LL -0.3 V to 27 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LH -0.3 V to 32 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OUT_u -0.3 V to 32 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OUT_d -0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PWM/SKIP -0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VCC_Sense -0.3 V to 27V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power dissipation (T

A

= 25°C) 874 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating temperature (TA) -40°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating temperature (TJ) -40°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature (T

STG)

-55°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings 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.

NOTES: 1. All voltage values are with respect to the network ground terminal.

2. This rating is specified at duty ≤10% on output rise and fall each pulse. Each pulse width (rise and fall) for the peak current should
not exceed 2 µs.

3. See Dissipation Rating Table for free-air temperature range above 25°C.

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 85°C

POWER RATING

DBT 874 mW 6.993 mW/°C 454 mW

recommended operating conditions

PARAMETERS MIN NOM MAX UNIT

Supply voltage, Vcc 4.5 25 V

INV1/2 CT RT, PWM/SKIP, SOFTSTART 6

p

5 V_IN -0.1 5.5

Input voltage, V

I

STBY1, STBY2 12

V

TRIP1/2 VCC_SENSE -0.1 25

C

T

100 pF

Oscillator frequency

R

T

82 kΩ

f

osc

PWM 200 KHz

Operation temperature range, T

A

-40 85 °C

TPS5102

DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER

SLVS239 - SEPTEMBER 1999

7

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

electrical characteristics over recommended operating free-air temperature range, VCC = 7 V
(unless otherwise noted)

reference voltage

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

TA = 25°C, I

vref

= 50 µA 1.167 1.185 1.203

Vref

Reference voltage

I

vref

= 50 µA 1.155 1.215

V

Regin Line regulation Vcc = 4.5, 25V, I = 50 µA 0.2 12 mV
Regl Load regulation I = 0.1 µA to 1 mA 0.5 10 mV

quiescent current

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Icc Operating current without switching

Both STBY > 2.5 V ,
No switching, Vin = 4.5 – 25 V

0.6 1.5 mA

Iccs Stand-by current Both STBY < 0.5 V , Vin = 4.5 – 25 V 1 1000 nA

oscillator

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

fosc Frequency PWM operation 500 kHz
R

T

Timing resistor 56 kΩ

fdv

Vcc = 4.5 V to 25 V 0.1%

fdt

fosc change

TA = -40°C to 85°C 2%

p

DC, includes internal comparator error 1 1.1 1.2

V

oscH

H-level output voltage

Fosc = 200 kHz, Includes internal comparator error 1.17

V

p

Includes internal comparator error 0.4 0.5 0.6

V

oscL

L-level output voltage

Fosc = 200 kHz, Includes internal comparator error 0.43

V

error amp

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Vio Input offset voltage TA = 25°C ±2 ±10 mV
Av Open-loop voltage gain 50 dB
GB Unity-gain bandwidth 0.8 MHz
Isnk Output sink current Vo = 0.4 V 30 45 µA
Isrc Output source current Vo = 1 V 300 µA

skip comparator

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Vhys

†

Hysteresis window 6 9.5 13 mV
Vhoff Offset voltage 2 mV
Ihbias Bias current 10 pA
T

LHT

Propagation delay‡ from INV to OUTxU TTL input signal 0.7 µs
T

LH

10 mV overdrive on hysteresis band signal 1.2 µs

†

Vhys is assured by design.

‡

The total delay in the table includes the driver delay.

TPS5102
DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER

SLVS239 - SEPTEMBER 1999

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

electrical characteristics over recommended operating free-air temperature range, VCC = 7 V
(unless otherwise noted) (continued)

driver deadtime

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

T

DRVLH

Low side to high side 70 nS

T

DRVHL

High side to low side 85 nS

standby

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

IH

H-level input voltage

2.5

V

IL

L-level input voltage

STBY1, STBY2

0.5

V

T

turnon

Propagation delay

p

1.5

T

turnoff

Propagation delay

STBY to driver output

1.8

µ

s

5V regulator

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

O

Output voltage I = 10 mA 4.7 5.3 V
Regin Line regulation Vcc = 5.5 V, 25 V, I = 10 mA 20 mV
Regl Load regulation I = 1 V, 10 mA, Vcc = 5.5 V 40 mV
Ios Short-circuit output current Vref = 0 V 80 mA

5-V internal switch

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

TLH

4.2 4.8 V

V

THL

Threshold voltage

4.1 4.7 V

V

hys

Hysteresis 30 150 mV

UVLO

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

TLH

3.7 4.2 V

V

THL

Threshold voltage

3.6 4.1 V

V

hys

Hysteresis 10 40 150 mV

current limit

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

PWM mode 10 15 20

Internal current source

Skip mode 3 5 7

µ

A

Input offset voltage 2.5 mV

driver output

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

OUT_u sink current

0.5 1.2

OUT_d sink current

Vo

= 3

V

0.5 1.2

A

OUT_u source current

–1 –1.7

OUT_d source current

Vo

= 3

V

–1 –1.5

A

TPS5102

DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER

SLVS239 - SEPTEMBER 1999

9

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

electrical characteristics over recommended operating free-air temperature range, VCC = 7 V
(unless otherwise noted) (continued)

softstart

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

I

CTRL

Soft-start current 1.8 2.5 3 µA
Maximum discharge current 0.92 mA

V

TLH

p

3.4 3.9 4.7

V

THL

Threshold voltage (skip mode)

1.8 2.6 3.4

V

output voltage protection (COMP)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Threshold voltage 0.9 1.1 1.3 V
Progagation delay†, 50% duty cycle,

No capacitor on COMP or OUT_u pin,
Frequency = 200 kHz

Turnon 900 ns

Turnoff (with channel on) 400 ns

†

The delay time in the table includes the driver delay.

PWM/SKIP

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

High to low 0.5

Threshold

Low to high 2

V

High to low 550

Dela

y

Low to high 400

ns

TPS5102
DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER

SLVS239 - SEPTEMBER 1999

10

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TYPICAL CHARACTERISTICS

Figure 1

500

300

100

0

010

IQ – Quiescent Current –

600

700

QUIESCENT CURRENT (BOTH CHANNELS ON)

vs

INPUT VOLTAGE

800

20 30

400

200

Aµ

VCC - Supply Voltage - V

TJ = 125°C

TJ = 25°C

TJ = -40°C

Figure 2

TJ = 25°C

TJ = -40°C

TJ = 125°C

100

80

40

0

4.5 7 10 15

– Quiescent Current – nA

120

140

160

20 25

60

20

I

Off

VCC - Supply Voltage - V

QUIESCENT CURRENT (BOTH CHANNELS STANDBY)

vs

INPUT VOLTAGE

Figure 3

3

2

1

0

0.1 0.5

– Driver Output Voltage – V

4

5

DRIVE CURRENT (SOURCE)

vs

DRIVE VOLTAGE

6

1

I

(src)

- Driver Source Current - A

V

(src)

TJ = 25°C

TJ = -40°C

TJ = 125°C

Figure 4

2

1.5

1

0

0.1 0.5

– Driver Output Voltage – V

2.5

3

DRIVE CURRENT (SINK)

vs

DRIVE VOLTAGE

3.5

1

0.5

V

(snk)

I

(snk)

- Driver Sink Current - A

TJ = 25°C

TJ = -40°C

TJ = 125°C