Datasheet

2
LTC1435A
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART
NUMBER
Input Supply Voltage (V
IN
).........................36V to –0.3V
Topside Driver Supply Voltage (BOOST)....42V to –0.3V
Switch Voltage (SW)............................. V
IN
+ 5V to –5V
EXTV
CC
Voltage ........................................ 10V to –0.3V
SENSE
+
, SENSE
–
Voltages...... INTV
CC
+ 0.3V to –0.3V
I
TH
, V
OSENSE
Voltages .............................. 2.7V to –0.3V
SFB, Run/SS Voltages .............................. 10V to –0.3V
Peak Driver Output Current < 10µs (TG, BG)............. 2A
INTV
CC
Output Current ........................................ 50mA
Operating Ambient Temperature Range
LTC1435AC ............................................ 0°C to 70°C
LTC1435AI ......................................... –40°C to 85°C
Junction Temperature (Note 1)............................. 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
T
JMAX
= 125°C, θ
JA
= 130°C/ W (G)
T
JMAX
= 125°C, θ
JA
= 110°C/ W (S)
Consult factory for Military grade parts.
LTC1435ACG
LTC1435ACS
LTC1435AIG
LTC1435AIS
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
G PACKAGE
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
C
OSC

RUN/SS
I
TH

SFB
SGND
V
OSENSE

SENSE
–

SENSE
+
TG
BOOST
SW
V
IN

INTV
CC

BG
PGND
EXTV
CC
T
A
= 25°C, V
IN
= 15V, V
RUN/SS
= 5V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
I
IN
V
OSENSE
Feedback Current (Note 2) 10 50 nA
V
OSENSE
Feedback Voltage (Note 2) ● 1.178 1.19 1.202 V
∆V
LINEREG
Reference Voltage Line Regulation V
IN
= 3.6V to 20V (Note 2) 0.002 0.01 %/V
∆V
LOADREG
Output Voltage Load Regulation I
TH
Sinking 5µA (Note 2) ● 0.5 0.8 %
I
TH
Sourcing 5µA ● –0.5 –0.8 %
V
SFB
Secondary Feedback Threshold V
SFB
Ramping Negative ● 1.16 1.19 1.22 V
I
SFB
Secondary Feedback Current V
SFB
= 1.5V –1 –2 µA
V
OVL
Output Overvoltage Lockout 1.24 1.28 1.32 V
I
Q
Input DC Supply Current EXTV
CC
= 5V (Note 3)
Normal Mode 3.6V < V
IN
< 30V 280 µA
Shutdown V
RUN/SS
= 0V, 3.6V < V
IN
< 15V 16 25 µA
V
RUN/SS
Run Pin Threshold ● 0.8 1.3 2 V
I
RUN/SS
Soft Start Current Source V
RUN/SS
= 0V 1.5 3 4.5 µA
∆V
SENSE(MAX)
Maximum Current Sense Threshold V
OSENSE
= 0V, 5V 130 150 180 mV
t
ON(MIN)
Minimum On-Time Tested with Square Wave, SENSE
–
= 1.6V, 250 300 ns
∆V
SENSE
= 20mV (Note 5 )
TG Transition Time
TG t
r
Rise Time C
LOAD
= 3000pF 50 150 ns
TG t
f
Fall Time C
LOAD
= 3000pF 50 150 ns
BG Transition Time
BG t
r
Rise Time C
LOAD
= 3000pF 50 150 ns
BG t
f
Fall Time C
LOAD
= 3000pF 40 150 ns
Internal V
CC
Regulator
V
INTVCC
Internal V
CC
Voltage 6V < V
IN
< 30V, V
EXTVCC
= 4V ● 4.8 5.0 5.2 V
V
LDO
INT INTV
CC
Load Regulation I
INTVCC
= 15mA, V
EXTVCC
= 4V –0.2 –1 %
V
LDO
EXT EXTV
CC
Voltage Drop I
INTVCC
= 15mA, V
EXTVCC
= 5V 130 230 mV
V
EXTVCC
EXTV
CC
Switchover Voltage I
INTVCC
= 15mA, V
EXTVCC
Ramping Positive ● 4.5 4.7 V