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L3751 Datasheet(PDF) 8 Page - STMicroelectronics

Part # L3751
Description  Wide 6 V to 75 V input voltage synchronous buck controller
PDF  41 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L3751 Datasheet(HTML) 8 Page - STMicroelectronics

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5
Electrical characteristics
VEN/UVLO = 1.5 V, VIN = 48 V; RRT = 24.9 kΩ; typical values are at TJ = 25 °C; minimum and maximum values are
at -40 °C ≤ TJ ≤ 125 °C, unless otherwise specified.
Table 7. Electrical characteristics
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
Input Supply
VIN
Operating input voltage
6
75
V
IQ
Quiescent current
Not switching, VSS/TRK = 0 V
1.8
2.3
mA
VEN/UVLO = 1 V
1.75
2.25
mA
IQ-SDN
Shutdown input current
VEN/UVLO = 0 V, VVCC < 1 V
8.5
21
µA
VCC regulator
VVCC
Internal regulator voltage
VSS/TRK = 0 V, 9 V ≤ VVIN ≤ 75 V,
IVCC = 10 mA
7.3
7.5
7.7
V
VVCC-LDO
VIN to VCC dropout voltage
VVIN = 6 V, VSS/TRK = 0 V, IVCC = 20 mA; TJ = 25
°C
0.25
0.63
V
ISC-LDO
VCC short-circuit current
VSS/TRK = 0 V, VVCC = 0 V; TJ = 25 °C
40
50
70
mA
VVCC-UV
VCC undervoltage threshold
VVCC rising
4.8
4.93
5.2
V
VVCC-UVH
VCC undervoltage hysteresis
VVCC falling
0.26
V
Enable and Input UVLO
VSDN
Shutdown to stand-by threshold
VEN/UVLO rising
0.42
V
VSDN-HYS
Shutdown threshold hysteresis
EN/UVLO falling
50
mV
VEN
Standby to operating threshold
VEN/UVLO rising
1.16
1.2
1.25
V
IEN-HYS
Standby to operating hysteresis
current
VEN/UVLO = 1.5 V
8
10
11
µA
Error Amplifier
VREF
FB reference voltage
FB connected to COMP
792
800
808
mV
IFB-BIAS
FB input bias current
VFB = 0.8 V; TJ = 25 °C
-0.1
0.1
µA
VCOMP-OH COMP output high voltage
VFB = 0 V, COMP sourcing 1 mA
3.3
V
VCOMP-OL
COMP output low voltage
COMP sinking 1 mA; TJ = 25 °C
0.3
V
AVOL (1)
DC gain
94
dB
GBW (1)
Unity gain bandwidth
6.5
MHz
Soft-Start and Voltage Tracking
ISS
SS/TRK capacitor charging current
VSS/TRK = 0 V
7.5
10
12
µA
RSS
SS/TRK discharge FET resistance
VEN/UVLO = 1 V, VSS/TRK = 0.1 V
12
Ω
VSS-FB
SS/TRK to FB offset
TJ = 25 °C
-15
15
mV
VSS-CLAMP SS/TRK clamp voltage
VSS/TRK – VFB, VFB = 0.8 V
115
mV
Power Good
PGUTH
FB upper threshold for PGOOD high
to low
% of VREF, VFB rising
106
108
110
%
L3751
Electrical characteristics
DS13841 - Rev 1
page 8/41



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