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LM3753 Datasheet, PDF (6/38 Pages) National Semiconductor (TI) – Scalable 2-Phase Synchronous Buck Controllers with Integrated FET Drivers and Linear Regulator Controller
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Symbol Parameter
Conditions
VCC
VVCC
IVCC
VCC Linear Regulator Output
Voltage
VCC Input Current from External
Supply
0 to 3 mA sourced to an external load;
VVIN = 5.5V to 18V
VVIN = 5.5V, VVCC = 5.5V
IVCC-SD
VCC Input Shutdown Current from VEN = 0V, VVIN = 12V, VVCC = 5V
External Supply
IVCC-LIM VCC Output Current Limit
VVCC-EN VCC UVLO Thresholds
VVCC-HYS VCC Threshold Hysteresis
tD-VCC
VCC UVLO/UVP Debounce Time
VDD, NBASE, BOOT1, BOOT2, SW1, SW2
VVCC = 2.5V
VVCC = 0V
VVCC Rising
VVCC Falling
VVDD
VNBASE
VNBASE-REG
IVDD
VDD Controller Regulation Voltage VVIN = 6V to 18V
VIN-to-NBASE Dropout
VVIN − 5.5V, 700 mV source connected
from VDD to NBASE, INBASE = 5 mA
VVIN − 5.5V, 700 mV source connected
from VDD to NBASE, INBASE = 1 mA
NBASE Load Regulation
VVIN = 18V, 700 mV source connected from
VDD to NBASE, INBASE steps 1 mA to 5 mA
VDD Operating Current from
External Power Supply
VVDD = VVIN = VVCC = 5.5V, fSW = 300 kHz,
Gate Drivers unloaded
IVDD-SD
INBASE-CL
IBOOT-SD
IBOOT
VDD Shutdown Current
VEN = 0V, VVIN = 12V, VVDD = 5V
NBASE Current Limit
VNBASE = VVDD + 0.7V, ΔVVDD = −100 mV
VNBASE = VVDD = 0V
BOOT1, BOOT2 Shutdown Current VEN = 0V, VSW1(2) = 0V, VBOOT − VSW = 5V
BOOT1, BOOT2 Operating Current VBOOT1(2) = 17.0V, VSW1(2) = 12.0V, fSW =
300 kHz, Gate Drivers unloaded
ISW
SW1, SW2 Leakage Current with VVCC = 0V, VEN = 0V, VSW1(2) = 3.6V
Pre-Biased Output
VVDD-TH VDD UVLO Thresholds
VVDD-HYS VDD UVLO/UVP Hysteresis
tD-VDD
VDD UVLO/UVP Debounce Time
Thermal Shutdown
VVDD Rising
VVDD Falling
TJ-SD
TJ-HYS
Thermal Shutdown Threshold
Thermal Shutdown Threshold
Hysteresis
Rising
Min
4.25
9
4.04
3.9
4.6
5.8
3.8
3.37
Typ
4.35
10
260
30
50
4.14
4
140
8
4.85
330
130
4
1
2
10
20
4.5
650
3
4.02
3.71
310
11
160
30
Max Units
4.45
V
20
mA
µA
53
mA
4.24
V
4.1
mV
µs
5.1
V
mV
mV
mA
30
µA
mA
15
µA
µA
µA
4.28
V
4.03
V
mV
µs
°C
°C
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