TEXAS INSTRUMENTS TPS2834, TPS2835 Technical data

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TPS2834, TPS2835

SYNCHRONOUS-BUCK MOSFET DRIVERS

WITH DEADTIME CONTROL

SLVS223 – NOVEMBER 1999

D

Floating Bootstrap or Ground-Reference
High-Side Driver

D

Active Deadtime Control

D

50-ns Max Rise/Fall Times With 3.3-nF Load

D

2-A Min Peak Output Current

D

4.5-V to 15-V Supply Voltage Range

D

TTL-Compatible Inputs

D

Internal Schottky Bootstrap Diode

D

SYNC Control for Synchronous or
Nonsynchronous Operation

D

CROWBAR for OVP, Protects Against

ENABLE

CROWBAR

SYNC

PGND

NC – No internal connection

D OR PWP PACKAGE

1

IN

NC

DT

2
3
4
5
6
7

(TOP VIEW)

14
13
12
11
10

9
8

BOOT
NC
HIGHDR
BOOTLO
LOWDR
NC
V

CC

Faulted High-Side Power FETs

D

Low Supply Current ...3 mA Typ

D

Ideal for High-Current Single- or Multiphase
Applications

D

–40°C to 125°C Junction-Temperature
Operating Range

description

The TPS2834 and TPS2835 are MOSFET drivers for synchronous-buck power stages. These devices are ideal
for designing a high-performance power supply using a switching controller that does not include suitable
on-chip MOSFET drivers. The drivers are designed to deliver minimum 2-A peak currents into large capacitive
loads. The high-side driver can be configured as ground-reference or as floating-bootstrap. An adaptive
dead-time control circuit eliminates shoot-through currents through the main power FETs during switching
transitions, and provides high efficiency for the buck regulator. The TPS2834 and TPS2835 have additional
control functions: ENABLE, SYNC, and CROWBAR. Both high-side and low-side drivers are off when ENABLE
is low. The low-side driver is configured as a nonsynchronous-buck driver when SYNC is low . The CROWBAR
function turns on the low-side power FET, overriding the IN signal, for overvoltage protection against faulted
high-side power FETs.

The TPS2834 has a noninverting input, while the TPS2835 has an inverting input. These drivers are available
in 14-terminal SOIC and TSSOP packages and operate over a junction temperature range of –40°C to 125°C.

AVAILABLE OPTIONS

PACKAGED DEVICES

–40°C to 125°C

The D and PWP packages are available taped and reeled. Add R
suffix to device type (e.g., TPS2834DR)

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.

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.

T

J

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SOIC

(D)

TPS2834D
TPS2835D

TSSOP

(PWP)

TPS2834PWP
TPS2835PWP

Copyright  1999, Texas Instruments Incorporated

1

TPS2834, TPS2835

I/O

DESCRIPTION

SYNCHRONOUS-BUCK MOSFET DRIVERS
WITH DEADTIME CONTROL

SLVS223 – NOVEMBER 1999

functional block diagram

(TPS2834 Only)

2

IN

(TPS2835 Only)

6

DT

200 kΩ

200 kΩ

8

14

12

11

V

CC

BOOT

HIGHDR

BOOTLO

V

CC

10

200 kΩ

7

LOWDR

PGND

ENABLE

1

SYNC

CROWBAR

5

3

Terminal Functions

TERMINAL

NAME NO.

BOOT 14 I Bootstrap terminal. A ceramic capacitor is connected between BOOT and BOOTLO to develop the floating

BOOTLO 11 O This terminal connects to the junction of the high-side and low-side MOSFETs.
CROWBAR 3 I CROWBAR can to be driven by an external OVP circuit to protect against a short across the high-side

DT 6 I Deadtime control terminal. Connect DT to the junction of the high-side and low-side MOSFETs.
ENABLE 1 I If ENABLE is low, both drivers are off.
HIGHDR 12 O Output drive for the high-side power MOSFET
IN 2 I Input signal to the MOSFET drivers (noninverting input for the TPS2834; inverting input for the TPS2835).
LOWDR 10 O Output drive for the low-side power MOSFET
NC 4, 9, 13
PGND 7 Power ground. Connect to the FET power ground
SYNC 5 I Synchronous rectifier enable terminal. If SYNC is low, the low-side driver is always off; If SYNC is high, the

V

CC

8 I Input supply. Recommended that a 1-µF capacitor be connected from VCC to PGND.

bootstrap voltage for the high-side MOSFET. The capacitor value is typically between 0.1 µF and 1 µF.

MOSFET. If CROWBAR is driven low, the low-side driver will be turned on and the high-side driver will be
turned off, independent of the status of all other control terminals.

low-side driver provides gate drive to the low-side MOSFET.

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

detailed description

low-side driver

TPS2834, TPS2835

SYNCHRONOUS-BUCK MOSFET DRIVERS

WITH DEADTIME CONTROL

SLVS223 – NOVEMBER 1999

The low-side driver is designed to drive low r
source and sink.

high-side driver

The high-side driver is designed to drive low r
source and sink. The high-side driver can be configured as a GND-reference driver or as a floating bootstrap
driver. The internal bootstrap diode is a Schottky, for improved drive ef ficiency. The maximum voltage that can
be applied from BOOT to ground is 30 V.

dead-time (DT) control

Dead-time control prevents shoot-through current from flowing through the main power FETs during switching
transitions by controlling the turnon times of the MOSFET drivers. The high-side driver is not allowed to turn
on until the gate drive voltage to the low-side FET is low, and the low-side driver is not allowed to turn on until
the voltage at the junction of the power FETs (Vdrn) is low; the TTL-compatible DT terminal connects to the
junction of the power FETs.

ENABLE

The ENABLE terminal enables the drivers. When enable is low, the output drivers are low. ENABLE is a
TTL-compatible digital terminal.

IN

The IN terminal is a TTL-compatible digital terminal that is the input control signal for the drivers. The TPS2834
has a noninverting input; the TPS2835 has an inverting input.

SYNC

N-channel MOSFET s. The current rating of the driver is 2 A,

DS(on)

N-channel MOSFET s. The current rating of the driver is 2 A,

DS(on)

The SYNC terminal controls whether the drivers operate in synchronous or nonsynchronous mode. In
synchronous mode, the low-side FET is operated as a synchronous rectifier. In nonsynchronous mode, the
low-side FET is always off. SYNC is a TTL-compatible digital terminal.

CROWBAR

The CROWBAR terminal overrides the normal operation of the driver. When CROWBAR is low, the low-side
FET turns on to act as a clamp, protecting the output voltage of the dc/dc converter against overvoltages due
to a short across the high-side FET. VIN should be fused to protect the low-side FET. CROWBAR is a
TTL-compatible digital terminal.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

TPS2834, TPS2835

A

SYNCHRONOUS-BUCK MOSFET DRIVERS
WITH DEADTIME CONTROL

SLVS223 – NOVEMBER 1999

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

Supply voltage range, V

(see Note 1) –0.3 V to 16 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC

†

Input voltage range:BOOT to PGND (high-side driver ON) –0.3 V to 30 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

BOOTLO to PGND –0.3 V to 16 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

BOOT to BOOTLO –0.3 V to 16 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ENABLE, SYNC, and CROWBAR (see Note 2) –0.3 V to 16 V. . . . . . . . . . . . . . . . . . . . .

IN –0.3 V to 16 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DT –0.3 V to 30 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating virtual junction temperature range, T
Storage temperature range, T

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

–40°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

J

Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds 260°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. Unless otherwise specified, all voltages are with respect to PGND.

DISSIPATION RATING TABLE

PACKAGE

D 760 mW 7.6 mW/°C 420 mW 305 mW

PWP 2400 mW 25 mW/°C 1275 mW 900 mW

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

TA = 85°C

POWER RATING

recommended operating conditions

MIN NOM MAX UNIT

Supply voltage, V
Input voltage BOOT to PGND 4.5 28 V

CC

4.5 15 V

electrical characteristics over recommended operating virtual junction temperature range,

= 6.5 V, ENABLE = High, CL = 3.3 nF (unless otherwise noted)

V

CC

supply current

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

CC

V

CC

NOTE 2: Ensured by design, not production tested.

Supply voltage range 4.5 15 V

Quiescent current

V

(ENABLE)

V

(ENABLE)

V

(ENABLE)

f

(SWX)

C

(HIGHDR)

See Note 2

= LOW, VCC =15 V 100
= HIGH, VCC =15 V 300 400
= HIGH,

= 200 kHz,

= 50 pF,

VCC =12 V,
BOOTLO grounded,
C

(LOWDR)

= 50 pF,

3 mA

µ

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

(see Note 2)

(see Note 2)
Duty cycle < 2%

(see Note 3)

Duty cycle < 2%

(see Note 3)

TPS2834, TPS2835

SYNCHRONOUS-BUCK MOSFET DRIVERS

WITH DEADTIME CONTROL

SLVS223 – NOVEMBER 1999

electrical characteristics over recommended operating virtual junction temperature range,

= 6.5 V, ENABLE = High, CL = 3.3 nF (unless otherwise noted) (continued)

V

CC

output drivers

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

High-side sink
(see Note 3)

Peak output current

Output resistance

NOTES: 2: Ensured by design, not production tested.

3. The pullup/pulldown circuits of the drivers are bipolar and MOSFET transistors in parallel. The peak output current rating is the
combined current from the bipolar and MOSFET transistors. The output resistance is the r
the voltage on the driver output is less than the saturation voltage of the bipolar transistor.

High-side source
(see Note 3)

Low-side sink

Low-side source

High-side sink (see Note 3)

High-side source (see Note 3)

Low-side sink (see Note 3)

Low-side source (see Note 3)

Duty cycle < 2%,
tpw < 100 µs

Duty cycle < 2%,
tpw < 100 µs

tpw < 100 µs
(see Note 2)

tpw < 100 µs
(see Note 2)

V
V

V
V

V
V

V
V

V
V

V
V

VCC = 4.5 V, V

,

VCC = 6.5 V, V
VCC = 12 V, V
VCC = 4.5 V, V

,

VCC = 6.5 V, V
VCC = 12 V, V
V

V
V

V
V

V
V

V
V

V
V

V
V
V
V
V
V
V

– V

(BOOT)
(HIGHDR)

– V

(BOOT)
(HIGHDR)

– V

(BOOT)
(HIGHDR)

– V

(BOOT)
(HIGHDR)

– V

(BOOT)
(HIGHDR)

– V

(BOOT)
(HIGHDR)

– V

(BOOT)
(HIGHDR)

– V

(BOOT)
(HIGHDR)

– V

(BOOT)
(HIGHDR)

– V

(BOOT)
(HIGHDR)

– V

(BOOT)
(HIGHDR)

– V

(BOOT)
(HIGHDR)

= 4.5 V, V

(DRV)

= 6.5 V, V

(DRV)

= 12 V, V

(DRV)

= 4.5 V, V

(DRV)

= 6.5 V, V

(DRV)

= 12 V, V

(DRV)

(BOOTLO)

= 4 V

(BOOTLO)

= 5 V

(BOOTLO)

= 10.5 V

(BOOTLO)

= 0.5V

(BOOTLO)

= 1.5 V

(BOOTLO)

= 1.5 V

(LOWDR)
(LOWDR)

(LOWDR)

LOWDR))
(LOWDR))

(LOWDR0)

(BOOTLO)

= 0.5 V

(BOOTLO)

= 0.5 V

(BOOTLO)

= 0.5 V

(BOOTLO)

= 4 V

(BOOTLO)

= 6 V

(BOOTLO)

=11.5 V

(LOWDR)
(LOWDR)

(LOWDR)

(LOWDR)
(LOWDR

(LOWDR)

= 4.5 V,

= 6.5 V,

= 12 V,

= 4.5 V,

= 6.5 V,

= 12 V,

= 4 V 1.3 1.8
= 5 V 2 2.5

= 10.5 V 3 3.5

= 0.5V 1.4 1.7

= 1.5 V 2 2.4
= 1.5 V 2.5 3

= 4.5 V,

= 6.5 V,

= 12 V,

= 4.5 V,

= 6.5 V,

= 12 V,

= 0.5 V 9
= 0.5 V 7.5

= 0.5 V 6

= 4 V 75
)= 6 V 75
= 11.5 V 75

0.7 1.1

1.1 1.5

2 2.4

1.2 1.4

1.3 1.6

2.3 2.7

of the MOSFET transistor when

DS(on)

5

5

5

75

75

75

A

A

A

A

Ω

Ω

Ω

Ω

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5