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LM3753 Datasheet, PDF (8/38 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
fBW-CS
3dB Bandwidth, CS1(2) to PWM
COMPARATOR Input
IILIM-SOURCE
VCL
tD-CL
tD-ILIM
tD-HICCUP
tD-COOL-DOWN
ILIM Source Current
VILIM = 0.6V to 3.6V, VVIN = 5.5V
Current Limit Threshold Voltage
VILIM − VCS1(2)
VILIM = 0.6V to 3.6V, VVIN = 5.5V
Current Limit Comparator
Propagation Delay
VCS1 or VCS2 stepped from 0.9V to 1.1V,
VILIM = 1V
Master or Slave Fast Current Limit VFB = 280 mV, 1-phase over-current:
Delay
VCS1 OR VCS2 > VILIM
VFB = 280 mV, 2-phase over-current:
VCS1 AND VCS2 > VILIM
Master or Slave Over-Current
1-phase over-current:
Hiccup Mode Delay
VCS1 OR VCS2 > VILIM
2-phase over-current:
VCS1 AND VCS2 > VILIM
Hiccup Over-Current Cool-Down
Time
Power Good: PGOOD, OVP, UVP
VOVP
tD-RESTART
NOVP-LATCH
OVP Threshold
OVP Restart Delay
Number of OVP Events Before
Latch-Off
VFB rising edge
VUVP
VUVP-HYS
tD-OVP/UVP
VPG-LO
IPG-LEAK
FAULT
UVP Threshold
UVP Threshold Hysteresis
OVP/UVP Debounce Time
PGOOD Low Level
PGOOD Leakage Current
VFB falling edge
IPGOOD = −4 mA
VPGOOD = 5.5V
IFAULT
Internal Pullup Current in Master
Mode
VOL-FAULT
VOH-FAULT
FAULT Output Low Level
FAULT Output High Level
IFAULT sinking 500 µA
IFAULT sourcing 50 µA
Oscillator and Synchronization (PLL): SYNC, SYNCOUT, FREQ
fSW-MIN
fSW-MAX
fSW
fSYNC
VSYNC-RISE
VSYNC-FALL
tSYNC-MIN
ISYNC
Minimum Switching Frequency
Maximum Switching Frequency
Switching Frequency Accuracy
SYNC Frequency Capture Range
SYNC Rising Threshold
SYNC Falling Threshold
SYNC Minimum Pulse Width
SYNC Bias Current
(internal or external VCC)
RFRQ = 121 kΩ
RFRQ = 21.3 kΩ
RFRQ = 78.7 kΩ
200 kHz to 1 MHz
VSYNC = 0 to 5.5V
VSYNCOUT-HI SYNCOUT Logic High Level
Sourcing 10 mA, VVCC = 4.5V external
VSYNCOUT-LO SYNCOUT Logic Low Level
Sinking 10 mA, VVCC = 4.5V external
Min
Typ
1.0
85
94
−2.5
0
200
7
3
446
223
6
125
130
2
7
75
80
25
5
0.14
5
325
0.21
VCC −
0.1
200
1000
282
300
±25
1.46
1.12
1.3
150
−15
VCC −
0.42
Max
103
4.6
135
85
0.25
300
318
1.68
25
0.48
Units
MHz
µA
mV
ns
Switch
cycles
Switch
cycles
Switch
cycles
Switch
cycles
ms
%VFB
ms
%VFB
mV
µs
V
nA
µA
V
V
kHz
kHz
kHz
%
V
V
ns
µA
V
V
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