Datasheet
4
LTC1627
Oscillator Frequency
vs Temperature
TEMPERATURE (°C)
–50 –25
300
OSCILLATOR FREQUENCY (kHz)
310
330
340
350
75 100
390
1627 G10
320
0 25 50 125
360
370
380
V
IN
= 5V
V
SYNC/FCB
= 0V
Maximum Output Load Current
vs Input Voltage
INPUT VOLTAGE (V)
2.5
200
MAXIMUM OUTPUT LOAD CURRENT (mA)
300
500
600
700
6.5
1100
1627 G12
400
4.5
3.5
7.5
5.5 8.5
800
900
1000
V
DR
= –V
IN
V
DR
= 0V
V
OUT
= 2.5V
L = 15µH
INPUT VOLTAGE (V)
2.5
300
OSCILLATOR FREQUENCY (kHz)
310
330
340
350
6.5
390
1627 G11
320
4.5
3.5
7.5
5.5 8.5
360
370
380
V
SYNC/FCB
= 0V
Oscillator Frequency
vs Input Voltage
TEMPERATURE (°C)
–50 –25
0
SYNCHRONOUS SWITCH LEAKAGE (nA)
200
600
800
1000
75 100
1800
1627 G13
400
0 25 50 125
1200
1400
1600
V
IN
= 8.4V
V
DR
= 0V
SYNCHRONOUS
SWITCH
MAIN
SWITCH
Switch Leakage Current
vs Temperature
Switch Resistance
vs Temperature
TEMPERATURE (°C)
–50 –25
0
SWITCH RESISTANCE (Ω)
0.1
0.3
0.4
0.5
75 100
0.9
1627 G14
0.2
0 25 50 125
0.6
0.7
0.8
V
IN
= 5V
V
DR
= 0V
SYNCHRONOUS
SWITCH
MAIN
SWITCH
Switch Resistance
vs Input Voltage
INPUT VOLTAGE (V)
2.5
0
SWITCH RESISTANCE (Ω)
0.1
0.3
0.4
0.5
6.5
0.9
1627 G15
0.2
4.5
3.5
7.5
5.5 8.5
0.6
0.7
0.8
V
DR
= 0V
SYNCHRONOUS SWITCH
MAIN SWITCH
Load Step Transient Response
V
OUT
50mV/DIV
AC COUPLED
I
TH
0.5V/DIV
I
LOAD
500mA/DIV
25µs/DIV
V
IN
= 5V
V
OUT
= 3.3V
L = 15µH
C
IN
= 22µF
C
OUT
= 100µF
I
LOAD
= 0mA TO 500mA
Burst Mode OPERATION
1627 G16
V
OUT
20mV/DIV
AC COUPLED
I
LOAD
200mA/DIV
10µs/DIV
V
IN
= 5V
V
OUT
= 3.3V
L = 15µH
C
IN
= 22µF
C
OUT
= 100µF
I
LOAD
= 50mA
1627 G18
V
OUT
50mV/DIV
AC COUPLED
I
TH
0.5V/DIV
I
LOAD
500mA/DIV
25µs/DIV
V
IN
= 5V
V
OUT
= 3.3V
L = 15µH
C
IN
= 22µF
C
OUT
= 100µF
I
LOAD
= 0mA TO 500mA
FORCED CONTINUOUS MODE
1627 G17
Load Step Transient Response
Burst Mode Operation
SW
5V/DIV
TYPICAL PERFOR A CE CHARACTERISTICS
UW