BUF634A
BUF634A
www.ti.com
SBOS948E – FEBRUARY 2019 – REVISED DECEMBER 2020
SBOS948E – FEBRUARY 2019 – REVISED DECEMBER 2020
BUF634A 36-V, 210-MHz, 250-mA Output, High-Speed Buffer
The BUF634A device can be used as a standalone
open-loop driver, or used inside the feedback loop of
a precision op amp to provide both high-precision and
large output current drive with improved capacitive
load drive.
1 Features
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Pin-Selected Bandwidth: 35 MHz to 210 MHz
High Output Current: 250 mA
Slew Rate: 3750 V/µs
Low Quiescent Current: 1.5 mA (35-MHz BW)
Wide Supply Range: ±2.25 V to ±18 V
Internal Output Current Limit
Thermal Shutdown Protection
Available in Packages with Thermal Pad
Extended Temperature Operation:
–40°C to +125°C
For low-power applications, the BUF634A device
operates on a 1.5-mA quiescent current with a 250-
mA output, 3750-V/µs slew rate, and 35-MHz
bandwidth. The device consumes 8.5-mA quiescent
current in wide-bandwidth mode with a 210-MHz
bandwidth. The BUF634A is fully protected by an
internal current limit in its output stage and by thermal
shutdown, making the device rugged and easy to use.
2 Applications
The BUF634A device is rated to function over the
extended industrial temperature range of –40°C to
+125°C. The BUF634A comes in three packages: D
(SOIC), DRB (VSON), and DDA (HSOIC). The DRB
(VSON) and DDA (HSOIC) packages have excellent
thermal performance resulting from the thermal pad
on the bottom side. The DRB package comes in a
very small form factor of 3.0 mm × 3.0 mm, making
the device a very suitable option for portable and size-
constrained applications.
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Memory, Semiconductor Testers
Test Equipment
Headphone Drivers
Flight Control Systems
Capacitive Load Drivers
Valve Drivers, Solenoid Drivers
Line Drivers
3 Description
Device Information (1)
The BUF634A device is a high-performance, high-
fidelity, open-loop buffer that is capable of driving 250
mA of output current. The BUF634A is a 36-V device
with an adjustable bandwidth of 35 MHz to 210 MHz,
which is accomplished by varying the value of an
external resistor between the V– and BW pins.
PART NUMBER
PACKAGE
BODY SIZE (NOM)
4.90 mm × 3.90 mm
3.00 mm × 3.00 mm
4.90 mm × 3.90 mm
SOIC (8)
BUF634A
VSON (8)
HSOIC (8)
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
-80
RL = 16 W
RL = 32 W
RL = 250 W
V+
1 kQ
1 kQ
-90
-100
-110
-120
œ
VO
VIN
10
100
1k
Frequency (Hz)
10k
Vt
D003
THD+N vs Frequency Using the BUF634A with the
OPA2810 (VO = 10 VPP, 90-kHz Measurement
Bandwidth)
Boost the Output Current of Any Operational
Amplifier
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
Product Folder Links: BUF634A
Copyright © 2020 Texas Instruments Incorporated
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