2
LTC1929/LTC1929-PG
ORDER PART
NUMBER
LTC1929CG
LTC1929CG-PG
LTC1929IG
LTC1929IG-PG
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
T
JMAX
= 125°C, θ
JA
= 95°C/W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V, V
RUN/SS
= 5V unless otherwise noted.
(Note 1)
Input Supply Voltage (V
IN
).........................36V to –0.3V
Topside Driver Voltages (BOOST1,2).........42V to –0.3V
Switch Voltage (SW1, 2) .............................36V to –5 V
SENSE1
+
, SENSE2
+
, SENSE1
–
,
SENSE2
–
Voltages........................ (1.1)INTV
CC
to –0.3V
EAIN, V
OS
+
, V
OS
–
, EXTV
CC
, INTV
CC
,
RUN/SS, AMPMD Voltages..........................7V to –0.3V
Boosted Driver Voltage (BOOST-SW) ..........7V to –0.3V
PLLFLTR, PLLIN, V
DIFFOUT
Voltages .... INTV
CC
to –0.3V
I
TH
Voltage................................................2.7V to –0.3V
Peak Output Current <1µs(TGL1,2, BG1,2)................ 3A
INTV
CC
RMS Output Current................................ 50mA
Operating Ambient Temperature Range
LTC1929C.................................................. 0°C to 85°C
LTC1929I .............................................. –40°C to 85°C
Junction Temperature (Note 2)............................. 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
V
EAIN
Regulated Feedback Voltage (Note 3); I
TH
Voltage = 1.2V ● 0.792 0.800 0.808 V
V
SENSEMAX
Maximum Current Sense Threshold V
SENSE
–
= 5V ● 62 75 88 mV
V
SENSE1, 2
= 5V, LTC1929 Only 65 75 85 mV
I
INEAIN
Feedback Current (Note 3) –5 –50 nA
V
LOADREG
Output Voltage Load Regulation (Note 3)
Measured in Servo Loop; I
TH
Voltage = 0.7V ● 0.05 0.5 %
Measured in Servo Loop; I
TH
Voltage = 2V ● –0.1 –0.5 %
V
REFLNREG
Reference Voltage Line Regulation V
IN
= 3.6V to 30V (Note 3) 0.002 0.02 %/V
V
OVL
Output Overvoltage Threshold Measured at V
EAIN
0.84 0.86 0.88 V
UVLO Undervoltage Lockout V
IN
Ramping Down 3 3.5 4 V
g
m
Transconductance Amplifier g
m
I
TH
= 1.2V; Sink/Source 5µA; (Note 3) 3 mmho
g
mOL
Transconductance Amplifier Gain I
TH
= 1.2V; (g
m
xZ
L
; No Ext Load); (Note 3) 1.5 V/mV
I
Q
Input DC Supply Current (Note 4)
Normal Mode EXTV
CC
Tied to V
OUT
; V
OUT
= 5V 470 µA
Shutdown V
RUN/SS
= 0V 20 40 µA
I
RUN/SS
Soft-Start Charge Current V
RUN/SS
= 1.9V –0.5 –1.2 µA
V
RUN/SS
RUN/SS Pin ON Threshold V
RUN/SS
Rising 1.0 1.5 1.9 V
V
RUN/SSLO
RUN/SS Pin Latchoff Arming V
RUN/SS
Rising from 3V 4.1 4.5 V
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
G PACKAGE
28-LEAD PLASTIC SSOP
*PGOOD ON LTC1929-PG
28
27
26
25
24
23
22
21
20
19
18
17
16
15
RUN/SS
SENSE1
+
SENSE1
–
EAIN
PLLFLTR
PLLIN
NC
I
TH
SGND
V
DIFFOUT
V
OS
–
V
OS
+
SENSE2
–
SENSE2
+
NC
TG1
SW1
BOOST1
V
IN
BG1
EXTV
CC
INTV
CC
PGND
BG2
BOOST2
SW2
TG2
AMPMD*
