LM2641MTC-ADJ Datasheet, PDF (7/31 Pages) Texas Instruments – LM2641 Dual Adjustable Step-Down Switching Power Supply Controller

LM2641
www.ti.com
SNVS040B – JANUARY 2000 – REVISED APRIL 2013
Electrical Characteristics (continued)
Typicals and limits appearing in regular type apply for T_J = 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, V_IN = 10V, and V_SD = V_ON/OFF1 = V_ON/OFF2 = 5V. ^(1)(2)(3)
Symbol
Parameter
Conditions
Typical
Limit
Units
Secondary Feedback Threshold
Voltage (2NDFB/FPWM)
2.5
V
2.4
V(min)
2.6
V(max)
(2NDFB/FPWM) Pin
Pull-Up Current
(2NDFB/FPWM) Pin
Input Leakage Current
V_SFB = 2.4V
V_ON/OFF1 = 0V
V_ON/OFF2 = 5V
40
80
µA(max)
±0.1
µA
Gate Drive
V_BOOT
Bootstrap Voltage (Voltage from CBOOT1 and CBOOT2 Source 1µA
4.5
CBOOT1 to SW1 and from
Each
CBOOT2 to SW2)
V
4.3
V(min)
HDRV1 and HDRV2 Sink and
Source Current
0.35
A
LDRV1 and LDRV2 Sink and
Source Current
0.35
A
HDRV1 and HDRV2 High-Side V_CBOOT1 = V_CBOOT2 = 5V, V_SW1 =
6
Ω
On-Resistance
V_SW2 = 0V
HDRV1 and HDRV2 Low-Side V_CBOOT1 = V_CBOOT2 = 5V, V_SW1 =
4
Ω
On-Resistance
V_SW2 = 0V
LDRV1 and LDRV2 High-Side
On-Resistance
V_LIN = 5V
8
Ω
LDRV1 and LDRV2 Low-Side
On-Resistance
V_LIN = 5V
4
Ω
Oscillator
F_OSC
Oscillator Frequency
300
kHz
255
kHz(min)
345
kHz(max)
Minimum OFF-Time
V_FB1 =1V, Measured at HDRV1
250
ns
350
ns(max)
Maximum Frequency of
Synchronization
400
kHz(min)
Minimum Width of
Synchronization Pulses
SYNC Pulses are Low-Going
200
ns(min)
Error Amplifier
I_FB1, I_FB2
Feedback Input Bias Current
V_FB1 = V_FB2 = 1.4V
100
nA
250
nA(max)
I_COMP1, I_COMP2
COMP Output Source Current
V_FB1 = V_FB2 = 1V, V_COMP1 = V_COMP2
90
= 1V
µA
40
µA(min)
I_COMP1, I_COMP2 COMP Output Sink Current
V_FB1 = V_FB2 = 1.4V, V_COMP1 =
V_COMP2 = 0.2V
60
µA
40
µA(min)
Voltage References and Linear Voltage Regulator
V_BG
V_REF
Bandgap Voltage
Reference Voltage
0.01 mA ≤ I_REF ≤ 5 mA Source, V_LIN
≤ 6V
1.238
2.5
2.45
V
V
V(min)
2.55
V(max)
V_LIN
Output Voltage of the Linear
6V ≤ V_IN ≤ 30V,
Voltage Regulator
0 mA ≤ I_LIN ≤ 25 mA
5
V
4.6
V(min)
5.4
V(max)
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