LM5156H, LM51561H
LM5156H, LM51561H
www.ti.com
SNVSBV2 – SEPTEMBER 2020
SNVSBV2 – SEPTEMBER 2020
LM5156xH 2.2-MHz Wide VIN 65-V Non-synchronous Boost/SEPIC/Flyback Controller
with 150°C Maximum Junction Temperature
1 Features
2 Applications
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Functional Safety-Capable
– Documentation available to aid functional safety
system design
Suited for wide input operating range battery
applications
– 3.5-V to 60-V Operating range (65-V abs max)
– 2.97-V to 16-V when BIAS = VCC
– Minimum boost supply voltage 1.5 V when
BIAS ≥ 3.5 V
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Multiple-output flyback without optocoupler
LED bias supply
Wide input boost, SEPIC, flyback power module
Portable speaker application
Flyback POE power supply application
Battery-powered boost, SEPIC, flyback
3 Description
The LM5156xH (LM5156H and LM51561H) device is
a wide input range, non-synchronous boost controller
that uses peak current mode control. The device can
be used in boost, SEPIC, and flyback topologies.
– Input transient protection up to 65 V
– Minimized battery drain
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Low shutdown current ( IQ ≤ 2.6 µA )
Low operating current ( IQ ≤ 490 µA )
The device can start up from a 1-cell battery with a
minimum of 2.97 V if the BIAS pin is connected to the
VCC pin. It can operate with the input supply voltage
as low as 1.5 V if the BIAS pin is greater than 3.5 V.
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Small solution size and low cost
– Maximum switching frequency of 2.2 MHz
– Integrated error amplifier allows primary-side
regulation without optocoupler (flyback)
EMI mitigation
– Selectable dual random spread spectrum
Higher efficiency with low-power dissipation
– 100-mV ±7% accurate current limit threshold
– Strong 1.5-A peak standard MOSFET driver
– Supports external VCC supply
Avoid AM band interference and crosstalk
– Optional clock synchronization
– Dynamically programmable switching frequency
from 100 kHz to 2.2 MHz
Device Information
PART NUMBER
PACKAGE(1)
BODY SIZE (NOM)
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LM5156xH
HTSSOP (14)
5.0 mm × 4.4 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VSUPPLY
VLOAD
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BIAS
GATE
CS
VCC
UVLO/SYNC
DITHOFF
AGND
PGND
FB
Integrated protection features
PGOOD
– Constant peak current limiting over input
voltage
RT
SS COMP
– Optional hiccup mode overload protection (see
the Device Comparison Table)
– Programmable line UVLO
Typical Boost Application
– OVP protection
– Thermal shutdown
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Accurate ±1% accuracy feedback reference
Programmable extra slope compensation
Adjustable soft start
PGOOD indicator
14-Pin HTSSOP package (5.0 mm × 4.4 mm)
Create a custom design using the LM5156xH with
the WEBENCH® power designer
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.
Copyright © 2020 Texas Instruments Incorporated
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Product Folder Links: LM5156H LM51561H