LTC1627CS8 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1627CS8 Datasheet PDF : 16 Pages
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LTC1627
TYPICAL PERFOR A CE CHARACTERISTICS
Oscillator Frequency
vs Temperature
390
VIN = 5V
380 VSYNC/FCB = 0V
370
360
350
340
330
320
310
300
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
1627 G10
Switch Leakage Current
vs Temperature
1800
1600
VIN = 8.4V
VDR = 0V
1400
1200
1000
800
600
SYNCHRONOUS
SWITCH
400
200
0
– 50 – 25
MAIN
SWITCH
0 25 50 75
TEMPERATURE (°C)
100 125
1627 G13
Load Step Transient Response
ITH
0.5V/DIV
Oscillator Frequency
vs Input Voltage
390
VSYNC/FCB = 0V
380
370
360
350
340
330
320
310
300
2.5 3.5 4.5 5.5 6.5
INPUT VOLTAGE (V)
7.5 8.5
1627 G11
Switch Resistance
vs Temperature
0.9
VIN = 5V
0.8 VDR = 0V
0.7
SYNCHRONOUS
SWITCH
0.6
0.5
MAIN
0.4
SWITCH
0.3
0.2
0.1
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
1627 G14
Load Step Transient Response
ITH
0.5V/DIV
Maximum Output Load Current
vs Input Voltage
1100
1000
VDR = –VIN
900
VDR = 0V
800
700
600
500
400
300
VOUT = 2.5V
L = 15µH
200
2.5 3.5 4.5 5.5 6.5 7.5 8.5
INPUT VOLTAGE (V)
1627 G12
Switch Resistance
vs Input Voltage
0.9
VDR = 0V
0.8
0.7
SYNCHRONOUS SWITCH
0.6
0.5
MAIN SWITCH
0.4
0.3
0.2
0.1
0
2.5 3.5 4.5 5.5 6.5 7.5 8.5
INPUT VOLTAGE (V)
1627 G15
Burst Mode Operation
SW
5V/DIV
VOUT
50mV/DIV
AC COUPLED
VOUT
50mV/DIV
AC COUPLED
VOUT
20mV/DIV
AC COUPLED
ILOAD
500mA/DIV
ILOAD
500mA/DIV
ILOAD
200mA/DIV
25µs/DIV
VIN = 5V
VOUT = 3.3V
L = 15µH
CIN = 22µF
COUT = 100µF
ILOAD = 0mA TO 500mA
Burst Mode OPERATION
1627 G16
25µs/DIV
VIN = 5V
VOUT = 3.3V
L = 15µH
CIN = 22µF
COUT = 100µF
ILOAD = 0mA TO 500mA
FORCED CONTINUOUS MODE
1627 G17
VIN = 5V
VOUT = 3.3V
L = 15µH
CIN = 22µF
COUT = 100µF
ILOAD = 50mA
10µs/DIV
1627 G18
4
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