Datasheet
LM5118, LM5118-Q1
www.ti.com
SNVS566G –APRIL 2008–REVISED FEBRUARY 2013
Electrical Characteristics (continued)
Limits in standard type are for T
J
= 25°C only; limits in boldface type apply over the junction temperature range of -40°C to
+125°C. Unless otherwise specified, the following conditions apply: VIN = 48V, VCCX = 0V, EN = 5V, RT = 29.11 kΩ, No
load on LO and HO
(1)
.
Symbol Parameter Conditions Min Typ Max Units
OSCILLATOR (RT PIN)
f
SW1
Frequency 1 RT = 29.11 kΩ 178 200 224 kHz
f
SW2
Frequency 2 RT = 9.525 kΩ 450 515 575 kHz
SYNC
Sync threshold falling 1.3 V
CURRENT LIMIT
V
CS(TH)
Cycle-by-cycle Sense Voltage RAMP = 0 Buck Mode -103 -125 -147 mV
Threshold (CS-CSG)
V
CS(THX)
Cycle-by-cycle Sense Voltage RAMP = 0 Buck-Boost Mode -218 -255 -300 mV
Threshold (CS-CSG)
CS Bias Current CS = 0V 45 60 µA
CSG Bias Current CSG = 0V 45 60 µA
Current Limit Fault Timer 256 cycles
RAMP GENERATOR
I
R1
RAMP Current 1 VIN = 60V, VOUT = 10V 245 305 365 µA
I
R2
RAMP Current 2 VIN = 12V, VOUT = 12V 95 115 135 µA
I
R3
RAMP Current 3 VIN = 5V, VOUT = 12V 65 80 95 µA
VOUT Bias Current VOUT = 48V 245 µA
LOW SIDE (LO) GATE DRIVER
V
OLL
LO Low-state Output Voltage I
LO
= 100 mA 0.095 0.14 0.23 V
V
OHL
LO High-state Output Voltage I
LO
= -100 mA 0.25 V
V
OHL
= V
CC
-V
LO
LO Rise Time C-load = 1 nF, VCC = 8V 16 ns
LO Fall Time C-load = 1 nF, VCC = 8V 14 ns
I
OHL
Peak LO Source Current V
LO
= 0V, VCC = 8V 2.2 A
I
OLL
Peak LO Sink Current V
LO
= VCC = 8V 2.7 A
HIGH SIDE (HO) GATE DRIVER
V
OLH
HO Low-state Output Voltage I
HO
= 100 mA 0.1 0.135 0.21 V
V
OHH
HO High-state Output Voltage I
HO
= -100 mA, 0.25 V
V
OHH
= V
HB
-V
OH
HO Rise Time C-load = 1 nF, VCC = 8V 14 ns
HO Fall Time C-load = 1 nF, VCC = 8V 12 ns
I
OHH
Peak HO Source Current V
HO
= 0V, VCC = 8V 2.2 A
I
OLH
Peak HO Sink Current V
HO
= VCC = 8V 3.5 A
HB-HS Under Voltage Lock-out 3 V
BUCK-BOOST CHARACTERISTICS
Buck-Boost Mode Buck Duty Cycle
(2)
69 75 80 %
THERMAL
T
SD
Thermal Shutdown Temp. 165 °C
Thermal Shutdown Hysteresis 25 °C
θ
JA
Junction to Ambient 40 °C/W
θ
JC
Junction to Case 4 °C/W
(2) When the duty cycle exceeds 75%, the LM5118 controller gradually phases into the Buck-Boost mode.
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