LTM4642IY Ver la hoja de datos (PDF) - Linear Technology
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LTM4642IY Datasheet PDF : 32 Pages
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LTM4642
Electrical Characteristics The l denotes the specifications which apply over the full internal
operating temperature range (Note 2), otherwise specifications are at TA = 25°C, VIN = 12V. Per typical application in Figure 27.
Specified as each channel. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
ICPWR
IQ(VIN)
CPWR Bias Current
Input Supply Bias Current
IQ(VIN)
Input Supply Bias Current
DRVCC
Internal VCC Voltage
IDRVCC(REG)
DRVCC Load Regulation
EXTVCC(HYS) EXTVCC Switchover Hysteresis
EXTVCC
EXTVCC Switchover Voltage
Output Specifications
CPWR = 12V, MODE = Continuous
VIN = 12V, VOUT1 = 1.5V, Switching Continuous
VIN = 12V, VOUT2 = 1.5V, Switching Continuous
VIN = 20V, VOUT1 = 1.5V, Switching Continuous
VIN = 20V, VOUT2 = 1.5V, Switching Continuous
Shutdown, RUN = 0, VIN = 12V
VIN = 12V, VOUT = 1.5V, IOUT = 4A
VIN = 20V, VOUT = 1.5V, IOUT = 4A
6V < VIN < 20V, No Load
IDRVCC = 0 to 100mA
EXTVCC Ramping Positive
20
mA
25
mA
25
mA
22
mA
22
mA
10
µA
0.6
A
0.356
A
5
5.3 5.6
V
–1.5 –3
%
200
mV
4.4 4.6 4.8
V
IOUT1,2(DC)
ΔVOUT1(LINE)
VOUT(NOM)
ΔVOUT2(LOAD)
VOUT2(NOM)
VOUT1,2(AC)
fS
Output Continuous Current Range
Line Regulation Accuracy
VIN = 12V, VOUT = 1.5V (Note 5)
VOUT = 1.5V, VIN from 4.5V to 20V,
IOUT = 0A For Each Output
Load Regulation Accuracy
For Each Output, VOUT = 1.5V, 0A to 4A (Note 5)
VIN = 12V
Output Ripple Voltage
Output Ripple Voltage Frequency
IOUT = 0A, COUT = 100µF X5R Ceramic
VIN = 12V, VOUT = 1.5V
VIN = 20V, VOUT = 1.5V
IOUT = 2A, VIN = 12V, VOUT = 1.5V,
FREQ = 49.9k to Ground
0
4
A
l
0.1 0.2
%
l
±0.3 ±0.5
%
15
mV
15
mV
800
kHz
ΔVOUT(START) Turn-On Overshoot
tSTART
Turn-On Time
ΔVOUT(LS)
Peak Deviation for Dynamic Load
tSETTLE
IOUT(PK)
Settling Time for Dynamic Load
Step
Output Current Limit
Control Section
COUT = 100µF and 47µF X5R Ceramic, VOUT = 1.5V,
IOUT = 0A
VIN = 12V
VIN = 20V
COUT = 100µF X5R and 47µF Ceramic, VOUT = 1.5V,
IOUT = 0A Resistive Load, TRACK/SS = 10nF
VIN = 12V
Load: 0% to 50% to 0% of Full Load
COUT = 100µF and 47µF X5R Ceramic, VOUT = 1.5V,
VIN = 12V
Load: 0% to 50% to 0% of Full Load
COUT = 100µF and 47µF X5R Ceramic, VOUT = 1.5V,
VIN = 12V
COUT = 100µF and 47µF X5R Ceramic,
VIN = 6V, VOUT = 1.5V
VIN = 20V, VOUT = 1.5V
10
mV
10
mV
6
ms
50
mV
15
µs
7
A
7
A
VOUTS1(REG)
IVOUTS1
IVOUTS–
IVFB2
VFB2
Regulated Differential Feedback
VOUTS1-VOUTS–
VOUTS1 Input Bias Current
VOUTS– Input Bias Current
VFB2 Input Bias Current
Voltage at VFB2 Pin
Sensed at Load Point with Resistive Divider
(Note 4)
(Note 4)
(Note 4)
IOUT = 0A, VOUT = 2.5V
l 0.592 0.6 0.608
V
±5 ±25
nA
–25 –50
nA
–5 ±50
nA
l 0.592 0.6 0.608
V
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