Document
Supertex inc.
HV7355
Eight Channel, High Speed, Unipolar, Ultrasound Pulser 1.5A 150V
Features
►► HVCMOS technology for high performance ►► High density integrated ultrasound transmitter ►► 0 to +150V output voltage ►► ±1.5A source and sink current (min.) ►► ±300mA current in CW mode ►► Up to 18MHz operating frequency ►► Matched delay times ►► Built-in gate driver floating voltage regulator ►► 2.5 to 3.3V CMOS logic interface
Application
►► Portable medical ultrasound imaging ►► Piezoelectric transducer drivers ►► NDT ultrasound transmission ►► Pulse waveform generator
General Description
The Supertex HV7355 is an eight-channel, unipolar, high voltage, high-speed pulse generator. It is designed for medical ultrasound applications. This high voltage and high speed integrated circuit can also be used for other piezoelectric, capacitive or MEMS sensors in ultrasonic nondestructive detection and sonar ranger applications.
The HV7355 consists of a controller logic interface circuit, level translators, MOSFET gate drivers and high current P-channel and N-channel MOSFETs as the output stage for each channel.
The output stages of each channel are designed to provide peak output currents over ±1.5A for pulsing, when MC = 1, with up to 150V swings. When MC = 0, all the output stages drop the peak current to ±500mA for low-voltage CW mode operation to save power. This direct coupling topology of the gate driver not only saves one high voltage capacitor per channel, but also makes the PCB layout easier.
Typical Application Circuit
+3.3V
+5.0V
+5.0 to 150V
+3.3V Logic
VLL AVDD
EN PWR MC CWD IN0
Q0
VDD
CPF
VSS VDD
LR VPP
LT
VDD
VPF VDD
LT
IN7
SET LE CS
SCK
Q[7:0]
Q7
Data Latch
VDD LT
VDD LT
VPP
VPF VDD
Shift Reg.
SUB
Q7 D0
SDO
SDI
VSUB
GND
VSS
VPP VPF
TX0
RGND VPP
TX7
RGND
RGND
-5.0V
Doc.# DSFP-HV7355 D011314
X0 X7
Supertex inc. www.supertex.com
HV7355
Ordering Information
Part Number
Package Options
Packing
HV7355K6-G
56-Lead QFN (8x8)
250/Tray
HV7355K6-G M937 56-Lead QFN (8x8)
-G denotes a lead (Pb)-free / RoHS compliant package
2000/Reel
Absolute Maximum Ratings
Parameter
Value
GND, RGND and VSUB VLL, Positive logic supply VDD, Positive logic and level translator supply VSS, Negative level translator and LR supply VPP, High voltage positive supply ( VPP -VTXx) Voltage (VTXx - RGND) Voltage All logic input PINX, NINX and EN voltages Operating temperature
0V -0.5V to +7.0V -0.5V to +7.0V +0.5V to -7.0V -0.5V to +160V -0.5V to +160V -0.5V to +160V -0.5V to +7.0V -40°C to 125°C
Storage temperature
-65°C to 150°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect device reliability. All voltages are referenced to device ground.
Typical Thermal Resistance
Package 56-Lead QFN
θja 21OC/W
ESD Sensitive Device
Pin Configuration
56
1
56-Lead QFN (top view)
Package Marking
HV7355K6 LLLLLLLLL YYWW AAA CCC
L = Lot Number YY = Year Sealed WW = Week Sealed A = Assembler ID C = Country of Origin
= “Green” Packaging
Package may or may not include the following marks: Si or
56-Lead QFN
Power-Up Sequence
Power-Down Sequence
Step
Description
Step
Description
1 VSS
1 EN & logic signal low
2 VLL with logic signal low
3
VPP
3 VDD
4 VDD
4 VPP
5 VLL
5 EN & logic signal go to high
6
VSS
Note: Powering up/down in any arbitrary sequence will not cause any damage to the device. The powering up/down sequence is only recommended in order to minimize possible inrush current.
Truth Table (MC = X)
Drive Mode Control Table
Logic Inputs
EN
Q[7:0]
IN0~7
1 1111,1111 0
1 1111,1111 1
10X
0XX
Output TX0~7 GND VPP GND
HiZ
MC
ISC
(A)
RonP
RonN
0 0.50 18
13
1 1.6 8.0 3.0
Note: VPP = +150V, VDD = +5.0 V, VLL = +3.3V, VSS = -5.0V, VSUB = 0V
Doc.# DSFP-HV7355 D011314
Supertex inc.
2 www.supertex.com
HV7355
Operating Supply Voltages and Current (Eight Active Channels)
(Operating conditions, unless otherwise specified, VLL = +3.3V, VADD = VDD = +5.0V, VSS = -5.0V ,VPP = +150V, TA = 25°C)
Sym Parameter
Min Typ Max Units Conditions
VLL VDD VPP VSS VPF ILL IDDQ IDDEN IDDEN IDDENCW ISSQ ISSEN ISSEN ISSENCW IPPQ IPPEN IPPEN IPPENCW
Logic voltage reference
Internal voltage supply
Positive gate driver supply
Negative low voltage supply
Gate driver floating voltage
VLL Current EN = Low VDD Current EN = Low VDD Current EN = High VDD Current MC = High VDD Current MC = Low VSS Current EN = Low VSS Current EN = High VSS Current MC = High VSS Current MC = Low VPP Current EN = Low VPP Current EN = High VPP Current MC = High VPP Current MC = Low
2.37 3.30 3.47 V ---
4.5 5.0 5.5 V ---
VDD
-
+150
V ---
-5.5 -5.0 -4.5 V ---
- 5.0 - V ---
- 2.0 10 μA ---
- 50 150 μA f = 0MHz
- 1.0 4.0 mA f = 0MHz
- 160 - mA f = 5.0MHz, continuous - 12 - mA no loads
- 5.0 20 μA ---
- 1.0 4.0 mA f = 0MHz
- 95 .