lt1432 Linear Technology Corporation, lt1432 Datasheet - Page 3

• Manufacturer Part Number: lt1432
• Description: 3.3v High Efficiency Step-down Switching Regulator Controller
• Manufacturer: Linear Technology Corporation

PARAMETER
Burst Mode Operation Quiescent Input Supply Current
Burst Mode Operation Output Ripple Voltage
Normal Mode Equivalent Input Supply Current
Normal Mode Minimum Operating Input Voltage
Burst Mode Operation Minimum Operating Input Voltage
Efficiency
Load Regulation
The
temperature range.
Note 1: Does not include current drawn by the power IC. See operating
parameters in standard circuit.
Note 2: Breakdown voltage on the Mode pin is 7V. External current must
be limited to value shown.
ELECTRICAL C
EQUIVALE
Operating parameters in standard circuit configuration.
V
IN
= 7V, I
denotes specifications which apply over the full operating
OUT
= 0, unless otherwise noted. These parameters guaranteed where indicated, but not tested.
* S3 IS CLOSED ONLY DURING START-UP.
** S1 AND S2 ARE SHOWN IN NORMAL
MODE. REVERSE FOR Burst Mode
OPERATION.
U
V
IN
T
HARA TERISTICS
S
3
CHE
V
IN
D2
S3*
W
C
4
A
V
TIC
+
V
SW
V
6
C
V
C
CONDITIONS
I
I
Extrapolated from I
100mA < I
5mA < I
Normal Mode
Burst Mode Operation I
Normal Mode
Burst Mode Operation 0 < I
OUT
OUT
LT1271
= 0
= 50mA
OUT
OUT
GND
< 50mA
Figure 2
V
FB
IN
< 1.5A
OUT
Note 3: Current limit sense voltage temperature coefficient is +0.33%/ C
to match TC of copper trace material.
Note 4: V
5
= 20mA
I
50mA < I
OUT
OUT
DIODE
CONTROL
OUT
= 0.5A
= 25mA
MODE
OUT
8
S1**
< 50mA
S2**
OUT
MODE
pin switched from 3.6V to 3.0V.
60mV
< 2A
V
LIM
+
1
+
–
–
2
OPTIONAL
CONNECTION
OF D2
V
OUT
MIN
4.1
GND
7
LT1432-3.3
TYP
120
1.6
3.0
4.5
86
80
70
30
5
LT1432-3.3 F02
3.3V
MAX
2.2
15
V
UNITS
mV
mV
3
mA
mA
mV
mV
p-p
p-p
%
%
V