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LM5123-Q1 Datasheet Preview

LM5123-Q1 Datasheet

Wide VIN Low-IQ Synchronous Boost Controller

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LM5123-Q1
SLVSFF1 – DELCMEM5B1E2R32-Q0210
SLVSFF1 – DECEMBER 2020
LM5123-Q1 2.2-MHz Wide VIN Low-IQ Synchronous Boost Controller with VOUT
Tracking
1 Features
• AEC-Q100 qualified for automotive applications
– Temperature grade 1: –40°C to +125°C, TA
• Suited for wide operating range automotive battery
powered applications
– 3.8-V to 42-V input operating range
– Dynamically programmable VOUT from 5 V to
20 V, or from 15 V to 57 V
– Minimum boost input 0.8 V when BIAS ≥ 3.8 V
– Bypass operation when VSUPPLY > VLOAD
• Minimized battery drain
– Shutdown current ≤ 3 μA
– Automatic mode transition
– Battery drain in deep sleep ≤ 11 μA (bypass
operation, charge pump off)
– Optional programmable spread spectrum
– Lead-less package
• Programmability and flexibility
– Dynamic VOUT tracking
– Dynamic switching frequency programming
– Programable line UVLO
– Adjustable soft start
– Adaptive dead-time
– PGOOD indicator
• Integrated protection features
– Cycle-by-cycle peak current limit
– Overvoltage protection
– HB-SW short protection
– Thermal shutdown
2 Applications
– Battery drain in deep sleep ≤ 33 μA (bypass
operation, charge pump on)
– BIAS IQ in sleep ≤ 11 μA (skip mode)
– Strong 5-V MOSFET drivers
• Small solution size and low cost
– Maximum switching frequency 2.2 MHz
Automotive audio power supply with tracking
Automotive LED bias supply
Automotive HVAC controller supply
Automotive motor power supply
3 Description
– Internal boot diode
– Constant peak current limit over VIN
– Supports DCR inductor current sensing
The LM5123-Q1 device is a wide input range
synchronous boost controller that employs peak
current mode control.
– QFN-20 with wettable flanks
• Avoid AM band interference and crosstalk
– Optional clock synchronization
– Switching frequency from 100 kHz to 2.2 MHz
– Selectable switching mode (FPWM, diode
emulation, skip mode)
Device Information
PART NUMBER
PACKAGE(1)
BODY SIZE (NOM)
LM5123-Q1
QFN (20)
3.5 mm x 3.5 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
• EMI mitigation
VLOAD
VSUPPLY
VSUPPLY
VSUPPLY
VOUT
BIAS
VCC
HB
RT
HO
SS
SW
COMP
LO
PGND
MODE
AGND
CSN
PGOOD
CSP
VREF
UVLO SYNC/DITHER TRK
VDD(MCU)
Power Good
Indicator to MCU
Envelop tracking
input from MCU
Typical Application
CopyrighAtn©I2M0P20OTReTxaAsNITnsNtruOmTeInCtsEInactotrhpeoreatnedd of this data sheet addresses availability, warranty, changes, use iSnusbamfeittyD-corcituicmael anpt pFleiceadtbioancsk,
1
intellectual property matters and other important disclaimers. ADVANCE INFORMATION for preproduction products; subject to change
without notice.
Product Folder Links: LM5123-Q1




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LM5123-Q1 Datasheet Preview

LM5123-Q1 Datasheet

Wide VIN Low-IQ Synchronous Boost Controller

No Preview Available !

LM5123-Q1
SLVSFF1 – DECEMBER 2020
www.ti.com
Table of Contents
1 Features............................................................................1
2 Applications..................................................................... 1
3 Description.......................................................................1
4 Revision History.............................................................. 2
5 Description (continued).................................................. 2
6 Pin Configuration and Functions...................................3
7 Specifications.................................................................. 5
7.1 Absolute Maximum Ratings ....................................... 5
7.2 ESD Ratings .............................................................. 5
7.3 Recommended Operating Conditions ........................6
7.4 Thermal Information ...................................................6
7.5 Electrical Characteristics ............................................6
8 Detailed Description...................................................... 11
8.1 Overview................................................................... 11
8.2 Functional Block Diagram......................................... 11
8.3 Feature Description...................................................11
8.4 Device Functional Modes..........................................24
9 Application and Implementation.................................. 28
9.1 Application Information............................................. 28
9.2 Typical Application.................................................... 28
9.3 System Example....................................................... 29
10 Power Supply Recommendations..............................30
11 Layout........................................................................... 31
11.1 Layout Guidelines................................................... 31
11.2 Layout Example...................................................... 32
12 Device and Documentation Support..........................33
12.1 Receiving Notification of Documentation Updates..33
12.2 Support Resources................................................. 33
12.3 Trademarks............................................................. 33
12.4 Electrostatic Discharge Caution..............................33
12.5 Glossary..................................................................33
13 Mechanical, Packaging, and Orderable
Information.................................................................... 33
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
DATE
December 2020
REVISION
*
NOTES
Initial release
5 Description (continued)
The device features a low shutdown IQ and a low IQ sleep mode, which minimizes battery drain at no and light
load condition. The device also supports an ultra-low IQ deep sleep mode with bypass operation, which
eliminates the need for an external bypass switch when the supply voltage is greater than the boost output
regulation target.
The output voltage can be dynamically programmed by using the tracking function. Controller architecture
simplifies thermal management at harsh ambient temperature conditions when compared to converter
architectures.
Wide input range supports automotive cold-crank and load dump. Minimum input voltage can be as low as 0.8 V
when BIAS is equal to or greater than 3.8 V. The switching frequency is dynamically programmed with an
external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows a
small solution size and fast transient response.
The device has built-in protection features such as peak current limit, which is constant over VIN, overvoltage
protection, and thermal shutdown. External clock synchronization, programmable spread spectrum modulation,
and a lead-less package with minimal parasitic help to reduce EMI and avoid cross talk. Additional features
include line UVLO, FPWM, diode emulation, DCR inductor current sensing, programmable soft start, and power-
good indicator.
2
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Product Folder Links: LM5123-Q1
Copyright © 2020 Texas Instruments Incorporated


Part Number LM5123-Q1
Description Wide VIN Low-IQ Synchronous Boost Controller
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