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LM5145 Datasheet(PDF) 19 Page - Texas Instruments

Part # LM5145
Description  LM5137 4V to 80V, 100% Duty Cycle Capable, Dual-Channel, Synchronous Buck DC/DC Controller
PDF  74 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LM5145 Datasheet(HTML) 19 Page - Texas Instruments

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7.2 Functional Block Diagram
BIAS
CONTROLLER CHANNEL 1/2
MOSFET GATE DRIVER CH1/2
5V LDO
300mA
PLL and
OSCILLATORS
DRSS
800mV
+
-
CURRENT SENSE
AMPLIFIER GAIN = 10
+
–
CURRENT
LIMIT
CBOOT1/2
UVLO
90µs
glitch filter
2ms recovery
delay
PGOV
PGUV
840mV
(8mV hyst)
760mV
(8mV hyst)
FB
SELECTOR
3.3V/5V/12V
or external FB
ERROR
AMPLIFIER
INTERNAL FB
CONFIG
DECODER
CBOOT1/2
SYNCOUT
RT
HO1/2
SW1/2
LO1/2
PGND
VCC
+
–
SOFT START
COMMON
CHARGE
PUMP
-
+
PWM
COMPARATOR
+
SS
600µS
SLOPE
COMP
RAMP
+
–
SKIP-MODE
CURRENT
LIMIT
+
–
NEGATIVE
CURRENT
LIMIT
+
–
FB1/2
FB SKIP-MODE
REGULATION
COMPARATOR
INTERNAL FB
512 CLOCKS TO HICCUP
16384 CLOCKS TO RECOVER
PWM
HICCUP FAULT TIMER
EN1/2
+
-
–5.5mV
DEAD
TIME
LOGIC
1.75V 0.3V
0V
0V
+
–
COMP STANDBY
EN
EN1/2
EN
INTLV MODE
ILIM
SW1/2
FB1 and FB2
DECODER
SEC
INTLV
DUAL (5% DRSS)
DUAL
FB Select
3.3V / 5V / 12V / External
FB1/2
CNFG
RSS
STARTUP TIME
SSTIME
SSTIME
FB
Select
VOUT1
4.3V
0.6V
3.8V
3.5V
VCC_UV
EN_CH1/2
EN_BIAS
Detect SYNC
VREFs
VREF
PG VTH (760mV, 840mV)
DUAL (10% DRSS)
INTLV (5% DRSS)
INTLV (10% DRSS)
12
TSD
VCC
PFM/FPWM
+
–
1V
0V
+
–
1V
0V
+
–
270°
90°
CLK1 0°
CLK2 180°
100mV
800mV
600mV
SYNC
OUT
600mV
120mV
–300mV
PG1/2
COMP1/2
FB1/2
VOUT1/2
ISNS1/2+
AGND
VDDA
VCC
VIN
PFM/SYNC
EN1/2
CLK1/2
1V
0.95V
EN1/2
www.ti.com
LM5137
SNVSCU3 – OCTOBER 2025
Copyright © 2025 Texas Instruments Incorporated
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Product Folder Links: LM5137



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