Datasheet

3
LTC1627
INPUT VOLTAGE (V)
0
EFFICIENCY (%)
90
95
100
8
1627 G01
85
80
75
2
4
6
10
V
OUT
= 2.5V
L = 15µH
V
DR
= 0V
Burst Mode OPERATION
I
LOAD
= 100mA
I
LOAD
= 300mA
I
LOAD
= 10mA
Efficiency vs Input Voltage
OUTPUT CURRENT (mA)
1
70
EFFICIENCY (%)
90
95
100
10 100 1000
1627 G03
85
80
75
V
IN
= 3.6V
V
OUT
= 2.5V
L = 15µH
V
DR
= 0V
Burst Mode
OPERATION
SYNCHRONIZED
AT 525kHz
FORCED
CONTINUOUS
OUTPUT CURRENT (mA)
1
70
EFFICIENCY (%)
90
95
100
10 100 1000
1627 G02
85
80
75
V
IN
= 3.6V
V
OUT
= 2.5V
L = 15µH
Burst Mode OPERATION
V
DR
= 0V
V
DR
= –V
IN
Efficiency vs Load Current Efficiency vs Load Current
Undervoltage Lockout Threshold
vs Temperature
DC Supply Current*
vs Input VoltageEfficiency vs Load Current
OUTPUT CURRENT (mA)
1
70
EFFICIENCY (%)
90
95
100
10 100 1000
1627 G04
85
80
75
V
OUT
= 2.5V
L = 15µH
V
DR
= 0V
Burst Mode OPERATION
V
IN
= 2.8V
V
IN
= 3.6V
V
IN
= 7.2V
TEMPERATURE (°C)
–50 –25
2.30
UNDERVOLTAGE LOCKOUT THRESHOLD (V)
2.35
2.45
2.50
2.55
75 100
2.75
1627 G05
2.40
0 25 50 125
2.60
2.65
2.70
V
IN
RAMPING UP
V
IN
RAMPING DOWN
INPUT VOLTAGE (V)
*DOES NOT INCLUDE GATE CHARGE CURRENT
2.5
100
BATTERY VOLTAGE (V)
150
250
300
350
6.5
550
1627 G06
200
4.5
3.5
7.5
5.5 8.5
400
450
500
T
J
= 25°C
V
OUT
= 1.8V
SYNCHRONIZED AT 525kHz
Burst Mode OPERATION
Reference Voltage
vs Temperature
Forced Continuous Threshold
Voltage vs Temperature
Supply Current in Shutdown
vs Input Voltage
TEMPERATURE (°C)
–50 –25
0.790
REFERENCE VOLTAGE (V)
0.792
0.796
0.798
0.800
75 100
0.808
1627 G08
0.794
0 25 50 125
0.802
0.804
0.806
V
IN
= 5V
TEMPERATURE (°C)
–50 –25
0.790
FORCED CONTINUOUS THRESHOLD VOLTAGE (V)
0.792
0.796
0.798
0.800
75 100
0.808
1627 G09
0.794
0 25 50 125
0.802
0.804
0.806
V
IN
= 5V
INPUT VOLTAGE (V)
2.5
4
SUPPLY CURRENT IN SHUTDOWN (µA)
6
10
12
14
6.5
22
1627 G07
8
4.5
3.5
7.5
5.5 8.5
16
18
20
V
RUN/SS
= 0V
T
J
= 85°C
T
J
= 25°C
T
J
= –40°C
TYPICAL PERFOR A CE CHARACTERISTICS
UW