Texas Instruments TPS5602IDBR, TPS5602IDBT, TPS5602EVM-121 Datasheet

TPS5602

DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER

SLVS217 – JUNE 1999

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D

Independent Dual Channels

D

Hysteretic Control for Fast Transient
Response

D

4.5-V to 25-V Input Voltage Range

D

Adjustable Output Voltage Down to 1.2 V

D

Synchronous Rectifier Enables Efficiencies
of >95%

D

Minimized External Component Count

D

Separate Standby Control and Over Current
Protection

D

Low Supply Current...0.8 mA Typ

D

30-Pin TSSOP

D

Low Standby Current (1-µA maximum)

D

EVM Available (TPS5602EVM-121)

description

The TPS5602 is a dual-channel synchronous
buck switch-mode power supply controller
featuring very fast feedback control and minimized component count. By using the hysteretic control method,
it is ideal for high-transient current applications, such as ’C6000 and multiple ’C54x DSPs. The TPS5602 is
designed specifically for DSP applications that require high efficiency. Since both channels are independent,
the up and down power sequencing can be easily achieved by properly setting the standby pins. The wide input
voltage and adjustable output voltage make the TPS5602 suitable for many applications.

typical design

R4

R1

+

C3

R3

R2

D1

C2

C1

GND

5 V

C7

L1

C4

R5

R6

OUT2

C8

L2

C5

OUT1

1.8 V

3.3 V

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
22
21
20
19
18
17
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INV1

NC

SOFTSTAR T1

NC

C

T

NC

GND

REF
STBY1
STBY2

V

CC

COMP

SOFTSTAR T2

NC

INV2

LH1
OUT1_u
LL1
OUT1_d
OUTGND1
TRIP1
V

CC

SENSE
TRIP2
Vref5
REG5V_IN
OUTGND2
OUT2_d
LL2
OUT2_u
LH2

DBT PACKAGE

(TOP VIEW)

NC – No internal connection

TPS5602
DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER

SLVS217 – JUNE 1999

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

AVAILABLE OPTIONS

PACKAGE

T

A

TSSOP

(DBT)

EVM

°

°

TPS5602IDBT

–

40°C to 85°C

TPS5602IDBTR

TPS5602EVM-121

functional block diagram

4.5 V

OUTGND2

Comp

Hysteretic Comp.

Current Comp.

VREF5

Current Comp.

LH1

LL1

OUT1_d

OUT1_u

OUTGND1

TRIP1

TRIP2

OUT2_d

LL2
Out2_u

LH2

VccSENSE

REG5Vin

SFT1

SOFT START2

INV1

INV2

Vref

Vcc

STBY1
STBY2

UVLO

GND

SOFT START1

1.1 V

REF

OSC

1.185 V

1.185 V

Current

Protection

Trigger

SFT2

Setup trigger

Setup trigger

Trigger on

OSC on

Fixed off–time reset

1.185 V

DLY

3.8 V

Hysteretic Comp. DLY

DLY

DLY

C

T

TPS5602

DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER

SLVS217 – JUNE 1999

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Terminal Functions

TERMINAL

NAME NO.

I/O

DESCRIPTION

COMP 12 I/O Voltage monitor comparator input
C

T

5 I/O The oscillator frequency external capacitor connection
GND 7 Control GND
INV1 1 I CH1 hysteretic comparator inverting input
INV2 15 I CH2 hysteretic comparator inverting input
LH1 30 I/O CH2 high-side gate drive boost capacitor input
LH2 16 I/O CH1 high-side gate drive boost capacitor input
LL1 28 I/O CH1 high-side drive and current protection
LL2 18 I/O CH2 high-side drive and current protection
NC 2, 4, 6, 14
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 switch output
OUT2_u 17 O CH2 high-side switch output
OUTGND1 26 Output GND 1
OUTGND2 20 Output GND 2
REF 8 O 1.185-V reference voltage output
REG5V_IN 21 I External 5-V input
SOFTSTAR T1 3 I/O CH1 soft start control external capacitor connection
SOFTSTAR T2 13 I/O CH2 soft start control external capacitor connection
STBY1 9 I CH1 standby control
STBY2 10 I CH2 standby control
TRIP1 25 I CH1 output current control input
TRIP2 23 I CH2 output current control input
V

CC

11 I Supply voltage input
Vref5 22 O 5-V internal regulator output
VCCSENSE 24 I Supply voltage sense input

detailed description

vref (1.185 V)

The reference voltage is used for the output voltage setting and the voltage protection (COMP).

vref (5 V)

An internal linear voltage regulator offers a fixed 5-V voltage as the bootstrap voltage so that the design for the
bootstrap is much easier. The tolerance is 6%. The extra current capability can also be used to power external
circuitry .

5-V switch

If the internal 5-V switch senses a 5-V input from REG5V pin, the internal 5-V linear regulator will be
disconnected from the MOSFET drivers. The external 5-V will be used for the low-side driver and the high-side
bootstrap, thus increasing the efficiency.

TPS5602
DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER

SLVS217 – JUNE 1999

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

detailed description (continued)

hysteretic comparator

Each channel has a hysteretic comparator to regulate the output voltage of the synchronous-buck converter.
The hysteresis is set internally and is typically 8.5 mV. The total delay from the comparator input to the driver
output is typically 500 ns from low to high and 350 ns from high to low.

low-side driver

The low-side driver is designed to driver low-Rds(on) n-channel MOSFET s. The maximum drive voltage is 5V
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 the
Vref5, limiting the maximum drive voltage between OUTxU and LLx to 5 V. The maximum voltage that can be
applied between LHx and OUTGNDx is 30 V.

deadtime control

Deadtime control prevents shoot-through current from flowing through the main power FETs during switching
transitions by actively controlling the turnon time of the MOSFETs drivers. The typical deadtime from
low-side-driver-off to high-side-driver-on is 75 ns and 164 ns from high-side-driver-off to low-side-driver-on.

current protection

The current protection is achieved by sensing the high-side power MOSFET drain-to-source voltage drop during
on-time through V

CC

Sense and LLx pins. An external resistor between Vin and TRIPx pin with the internal
current source connected to the current comparator negative input adjusts the current limit. The typical internal
current source current is 15 µA. When the voltage on the positive pin is lower than the negative pin, the current
comparator turns on the trigger, and then activates the oscillator. This oscillator repeatedly resets the trigger
until the overcurrent condition is removed. The equation for the external resistor selection is:

Rclmt

+

Rds(on

) (

Itrip)Iind(p-p

)ń2)

0.000015

Where Rds(on) is the MOSFET turnon resistance; Itrip is the required trip current; Iind(p-p) is the peak-to-peak
inductor ripple current. Itrip must be greater than 0.5×Iind(p-p). The tolerance is ±30%.

COMP

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

SOFT1, SOFT2

Separate soft-start terminals make it possible to set the sequencing of each output for any possibility. The
capacitor value for a start-up time can be calculated by the following equation:

C = 2 × T (µF)

Where C is the external capacitor value, T is the required start-up time in (ms).

STBY1, STBY2

Both channels can be switched into standby mode separately by grounding the STBY pin. The standby current
is less than 1 µA. The STBY pins can be used for sequencing.

UVLO

When the input voltage rises to about 3.8 V , the IC is turned on, ready to function. When the input voltage falls
below the turnon value, the IC is turned off. The typical hysteresis is 149 mV.

TPS5602

DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER

SLVS217 – JUNE 1999

5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

absolute maximum ratings over operating free-air temperature (see Note 1) (unless otherwise
noted)

†

Supply voltage, V

CC

–0.3 V to 27 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage, V

I

, INV –0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Softstart –0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMP –0.3 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REG5V_IN –0.3 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

STBY –0.3 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TRIP –0.3 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Output voltage, LLx –0.3 V to 27 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output voltage, OUTx_u –0.3 V to 32 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output voltage, OUTx_d –0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power dissipation (T

A

= 25°C) See Dissipation Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T

A

–40°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating virtual junction temperature range, T

J

125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, 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.

NOTE 1: All voltages are with respect to GND terminal.

DISSIPATION RATING TABLE

PACKAGE

TA = 25°C

POWER DISSIPATION

TA ≥ 25°C

DERATING FACTOR

TA = 85°C

POWER DISSIPATION

DBT 874 mW 6.993 mW/°C 454 mW

recommended operating conditions

MIN NOM MAX UNIT

Supply voltage, V

CC

4.5 25 V
INV1/2 6
COMP 6
SOFTSTART1/2 6

Input voltage, V

I

REG5V_IN 5.5

V

STBY1/STBY2 12
TRIP1/2

V

CC_SENCE

25

Operation junction temperature range, T

A

–40 85 °C

electrical characteristics over recommended TA = –40°C to 85°C 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

V

ref

Reference voltage

VI = 4.5 V to 25 V, I = 1 µA to 1 mA 1.155 1.215

V

VI

(Regin)

Line regulation VCC = 5.5 V to 25 V, I = 50 µA 0.2 12 mV

VI

(Regl)

Load regulation I = 1 µA to 1 mA, 0.5 10 mV

TPS5602
DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER

SLVS217 – JUNE 1999

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

quiescent current

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

I

CC

Operating current without switching Both STBY >2.5 V ,

VI = 4.5 V to 25 V

No switching 0.8 1.5 mA

I

(CCS)

Stand-by current Both STBY <0.5 V , VI = 4.5 V to 25 V 1 1000 nA

hysteretic comparator

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

hys

†

Hysteresis window 5.5 8.5 11.5 mV

V

H(off)

Offset voltage 2 mV

I

H(bias)

Bias current 10 pA

t

(HLT)

, t

(LHT)

TTL input signal 230

t

(LH)

Propagation delay from INV to OUTxU

‡

500 650

ns

t

(HI)

10 mV overdrive on hysteretic band signal

350 500

†

V

hys

is assured by design.

‡

The delay time in the table includes the driver.

driver deadtime

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

t

(DRVLH)

Low side to high side 90

t

(DRVHL)

High side to low side 160

ns

standby

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

I

H

High-level input voltage

2.5 V

I

L

Low-level input voltage

STBY1, STBY2

0.5 V

Tturn-on

p

p

7.2

Tturn-off

Pro agation delay

Staby to driver out ut

4.8

µs

5 V regulator

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

O

Output voltage I = 10 mA 4.7 5.3 V

V

I(Regin)

VCC = 5.5 V to 25 V, I = 10 mA 20

V

I(Regl)

Load regulation

I = 1 mA to 10 mA, VCC = 5.5 V 40

mV

I

OS

Short-circuit output current Vref = 0 V 80 mA

TPS5602

DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER

SLVS217 – JUNE 1999

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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

5-V internal switch

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

TLH

4.2 4.9

V

THL

Threshold voltage

4.1 4.7

V

Rson On-time resistance 2.5 8 Ω
V

hys

Hysteresis 50 250 mV

current limit

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Internal current source 10 15 20 µA
Input offset voltage 2.5 mV

UVLO

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

(TLH)

3.6 4.2

V

(THL)

Threshold voltage

3.5 4.1

V

Hysteresis 50 250 mV

driver output

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

OUT_u sink current VO = 3 V 0.5 1.2
OUT_u source current VO = 2 V –1 –1.7

A

OUT_d sink current VO = 3 V 0.5 1.2
OUT_d source current VO = 2 V –1 –1.7

A

High side driver is GND referenced,

p

CL = 2200 pF 25.6

Rise time

In ut: INV

= 0 V – 3 V,

tr/tf = 10 ns, Frequency = 200 kHz,

CL = 3300 pF 30.8

ns

High side driver is GND referenced,

p

CL = 2200 pF 23.2

Fall time

In ut: INV

= 0 V – 3 V,

tr/tf = 10 ns, Frequency = 200 kHz,

CL = 3300 pF 25.2

ns

Softstart

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

I

(CTRL)

Softstart current 1.8 2.5 3 µA
Maximum discharge current 0.92 mA

COMP

†

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Threshold voltage 1 1.1 1.25 V

Turn on

Propagation delay 50% duty cycle,

452

Turn off

gyyy,

No capacitor on COMP or OUT_u pin,

Frequency

=

200 kHz

384

ns

†

The delay time in the table includes the drivers.

oscillator

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Frequency without Ct 202.4 kHz
Frequency with Ct Ct = 100 pF 67.5 kHz

TPS5602
DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER

SLVS217 – JUNE 1999

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TYPICAL CHARACTERISTICS

Figure 1

600

650

700

750

800

850

900

950

4.5 7.0 25.0
VCC – Supply Voltage – V

TJ = 125°C

– Quiescent Current –

QUIESCENT CURRENT (BOTH CHANNELS ON)

vs

SUPPLY VOLTAGE

Aµ

I

(qon)

TJ = 25°C

TJ = –40°C

Figure 2

0.0

20.0

40.0

60.0

80.0

100.0

120.0

140.0

160.0

4.5 7.0 10.0 15.0 20.0 25.0

– Quiescent Current – nA

QUIESCENT CURRENT (BOTH CHANNEL STANDBY)

vs

SUPPLY VOLTAGE

I

(off)

TJ = 125°C

TJ = 25°C

TJ = –40°C

VCC – Supply Voltage – V

Figure 3

0

1

2

3

4

5

6

0.1 0.5 1
I

(src)

– Driver Source Current – A

– Driver Output Voltage – V

DRIVE OUTPUT VOLTAGE

vs

DRIVE CURRENT (SOURCE)

V

(src)

TJ = 125°C

TJ = 25°C

TJ = –40°C

Figure 4

0

0.5

1

1.5

2

2.5

3

3.5

0.1 0.5 1
I

(sink)

– Driver Sink Current – A

– Driver Output Voltage – V

DRIVE VOLTAGE

vs

DRIVE CURRENT (SINK)

V

(snk)

TJ = 125°C

TJ = 25°C

TJ = –40°C