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LM2641MTCX-ADJ bảng dữ liệu(PDF) 7 Page - Texas Instruments

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LM2641
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SNVS040B – JANUARY 2000 – REVISED APRIL 2013
Electrical Characteristics (continued)
Typicals and limits appearing in regular type apply for TJ = 25°C. Limits appearing in boldface type apply over the entire
junction temperature range for operation, 0 to +125°C. Unless otherwise specified under the Parameter or Conditions
columns, VIN = 10V, and VSD = VON/OFF1 = VON/OFF2 = 5V.
(1)(2)(3)
Symbol
Parameter
Conditions
Typical
Limit
Units
Secondary Feedback Threshold
2.5
V
Voltage (2NDFB/FPWM)
2.4
V(min)
2.6
V(max)
(2NDFB/FPWM) Pin
VSFB = 2.4V
Pull-Up Current
VON/OFF1 = 0V
40
80
µA(max)
VON/OFF2 = 5V
(2NDFB/FPWM) Pin
±0.1
µA
Input Leakage Current
Gate Drive
VBOOT
Bootstrap Voltage (Voltage from
CBOOT1 and CBOOT2 Source 1µA
4.5
V
CBOOT1 to SW1 and from
Each
4.3
V(min)
CBOOT2 to SW2)
HDRV1 and HDRV2 Sink and
0.35
A
Source Current
LDRV1 and LDRV2 Sink and
0.35
A
Source Current
HDRV1 and HDRV2 High-Side
VCBOOT1 = VCBOOT2 = 5V, VSW1 =
6
Ω
On-Resistance
VSW2 = 0V
HDRV1 and HDRV2 Low-Side
VCBOOT1 = VCBOOT2 = 5V, VSW1 =
4
Ω
On-Resistance
VSW2 = 0V
LDRV1 and LDRV2 High-Side
VLIN = 5V
8
Ω
On-Resistance
LDRV1 and LDRV2 Low-Side
VLIN = 5V
4
Ω
On-Resistance
Oscillator
FOSC
Oscillator Frequency
300
kHz
255
kHz(min)
345
kHz(max)
Minimum OFF-Time
VFB1 =1V, Measured at HDRV1
250
ns
350
ns(max)
Maximum Frequency of
400
kHz(min)
Synchronization
Minimum Width of
SYNC Pulses are Low-Going
200
ns(min)
Synchronization Pulses
Error Amplifier
IFB1, IFB2
Feedback Input Bias Current
VFB1 = VFB2 = 1.4V
100
nA
250
nA(max)
ICOMP1, ICOMP2
COMP Output Source Current
VFB1 = VFB2 = 1V, VCOMP1 = VCOMP2
90
µA
= 1V
40
µA(min)
ICOMP1, ICOMP2
COMP Output Sink Current
VFB1 = VFB2 = 1.4V, VCOMP1 =
60
µA
VCOMP2 = 0.2V
40
µA(min)
Voltage References and Linear Voltage Regulator
VBG
Bandgap Voltage
1.238
V
VREF
Reference Voltage
0.01 mA
≤ IREF ≤ 5 mA Source, VLIN
2.5
V
≤ 6V
2.45
V(min)
2.55
V(max)
VLIN
Output Voltage of the Linear
6V
≤ VIN ≤ 30V,
5
V
Voltage Regulator
0 mA
≤ ILIN ≤ 25 mA
4.6
V(min)
5.4
V(max)
Copyright © 2000–2013, Texas Instruments Incorporated
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