Step-Down Converter. RT7296A Datasheet


RT7296A Converter. Datasheet pdf. Equivalent


Part Number

RT7296A

Description

17V Current Mode Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 16 Pages
Datasheet
Download RT7296A Datasheet


RT7296A
RT7296A
3A, 17V Current Mode Synchronous Step-Down Converter
General Description
The RT7296A is a high-efficiency, 3A current mode
synchronous step-down DC-DC converter with a wide
input voltage range from 4.5V to 17V. The device
integrates 80mhigh-side and 30mlow-side
MOSFETs to achieve high efficiency conversion. The
current mode control architecture supports fast
transient response and internal compensation. The
RT7296A provides TTH pin to adjust transition point
from PSM to PWM in order to balance efficiency and
output ripple. A cycle-by-cycle current limit function
provides protection against shorted output. The
RT7296A provides complete protection functions such
as input under-voltage lockout, output under-voltage
protection, over-current protection, and thermal
shutdown. The PWM frequency is adjustable by the
EN/SYNC pin. The RT7296A is available in the
TSOT-23-8 (FC) package.
Ordering Information
RT7296A
Package Type
J8F : TSOT-23-8 (FC)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Features
4.5V to 17V Input Voltage Range
3A Output Current
Internal N-Channel MOSFETs
Current Mode Control
Fixed Switching Frequency : 500kHz
Synchronous to External Clock : 200kHz to 2MHz
Cycle-by-Cycle Current Limit
TTH For Adjustable PSM to PWM Transition
Threshold
Internal Soft-Start Function
Input Under-Voltage Lockout
Output Under-Voltage Protection
Thermal Shutdown
RoHS Compliant and Halogen Free
Applications
Industrial and Commercial Low Power Systems
Computer Peripherals
LCD Monitors and TVs
Set-top Boxes
Marking Information
02=DNN
02= : Product Code
DNN : Date Code
Simplified Application Circuit
VIN
Enable
C1
R3
C2
R4
RT7296A
VIN BOOT
C3
SW
EN/SYNC
PVCC
R5
FB
TTH GND
L1
R1
R2
VOUT
C4
Copyright © 2018 Richtek Technology Corporation. All rights reserved.
DS7296A-04 February 2018
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT7296A
RT7296A
Pin Configuration
(TOP VIEW)
87 6 5
2 34
TSOT-23-8 (FC)
Functional Pin Description
Pin No.
1
2
Pin Name
TTH
VIN
Pin Function
Transition threshold. The TTH voltage sets the transition point from power
saving mode (PSM) to PWM. Connect the tap of 2 resistor dividers to force the
RT7296A into non-synchronous mode under light loads. Connect TTH pin high
(PVCC) to force the RT7296A into forced PWM mode. Don’t leave this pin
floating.
Power input. Support 4.5V to17V Input Voltage. Must bypass with a suitable
large ceramic capacitor at this pin.
3 SW
Switch node. Connect to external L-C filter.
4 GND
System ground.
5 BOOT
Bootstrap supply for high-side gate driver. Connect a 0.1F ceramic capacitor
between the BOOT and SW pins.
Enable control input. High = Enable. Apply an external clock to adjust the
6
EN/SYNC
switching frequency. If using pull high resistor connected to VIN, the
recommended value range is 60kto 300k.
7 PVCC
5V bias supply output. Connect a minimum of 0.1F capacitor to ground.
8 FB
Feedback voltage input. The pin is used to set the output voltage of the
converter to regulate to the desired voltage via a resistive divider. Feedback
reference = 0.8V.
Copyright © 2018 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS7296A-04 February 2018


Features RT7296A 3A, 17V Current Mode Synchronou s Step-Down Converter General Descript ion The RT7296A is a high-efficiency, 3 A current mode synchronous step-down DC -DC converter with a wide input voltage range from 4.5V to 17V. The device int egrates 80m high-side and 30m low -side MOSFETs to achieve high efficienc y conversion. The current mode control architecture supports fast transient re sponse and internal compensation. The R T7296A provides TTH pin to adjust trans ition point from PSM to PWM in order to balance efficiency and output ripple. A cycle-by-cycle current limit function provides protection against shorted ou tput. The RT7296A provides complete pro tection functions such as input under-v oltage lockout, output under-voltage pr otection, over-current protection, and thermal shutdown. The PWM frequency is adjustable by the EN/SYNC pin. The RT72 96A is available in the TSOT-23-8 (FC) package. Ordering Information RT7296A Package Type J8F : TSOT-23-8 (FC) Lead Plating System G : Green (.
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