LTC1929-PG LINER [Linear Technology], LTC1929-PG Datasheet - Page 4

• Manufacturer Part Number: LTC1929-PG
• Description: 2-Phase, High Efficiency,Synchronous Step-Down Switching Regulators
• Manufacturer: LINER [Linear Technology]

LTC1929/LTC1929-PG
ELECTRICAL CHARACTERISTICS
SYMBOL
I
A
V
CMRR
PSRR
I
V
GBW
SR
Note 1: Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 2: T
dissipation P
LTC1929CG: T
Note 3: The LTC1929 is tested in a feedback loop that servos V
specified voltage and measures the resultant V
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
TYPICAL PERFOR A CE CHARACTERISTICS
temperature range, otherwise specifications are at T
4
B
CL
OL
CM
O(MAX)
100
80
60
40
20
0
OA
0.1
OA
Efficiency vs Output Current
(Figure 13)
J
is calculated from the ambient temperature T
D
J
according to the following formulas:
= T
OUTPUT CURRENT (A)
PARAMETER
Input Bias Current
Open Loop DC Gain
Common Mode Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Maximum Output Current
Maximum Output Voltage
Gain-Bandwidth Product
Slew Rate
A
1
+ (P
D
V
V
V
V
• 95 C/W)
IN
IN
IN
IN
= 5V
= 8V
= 12V
= 20V
10
V
V
FREQ = 200kHz
OUT
EXTVCC
W
= 2V
= 0V
1929 G01
U
100
EAIN
.
A
100
and power
80
60
40
20
CONDITIONS
Op Amp Mode (LTC1929 Only)
Op Amp Mode; 0.7V V
(LTC1929 Only)
Op Amp Mode (LTC1929 Only)
Op Amp Mode; 0V < V
Op Amp Mode; 6V < V
Op Amp Mode; V
Op Amp Mode; I
Op Amp Mode; I
Op Amp Mode; R
0
0.1
A
Efficiency vs Output Current
(Figure 13)
= 25 C. V
ITH
V
EXTVCC
The
to a
OUTPUT CURRENT (A)
= 5V
IN
denotes the specifications which apply over the full operating
1
V
DIFFOUT
DIFFOUT
DIFFOUT
L
EXTVCC
= 15V, V
= 2k (LTC1929 Only)
Note 5: When the AMPMD pin is high (default for the LTC1929-PG), the
LTC1929 IC pins are connected directly to the internal op amp inputs.
When the AMPMD pin is low, internal MOSFET switches connect four
40k resistors around the op amp to create a standard unity-gain
differential amp.
Note 6: Minimum on-time condition corresponds to the on inductor
peak-to-peak ripple current 40% of I
considerations in the Applications Information section).
CM
IN
= 0V
= 1mA (LTC1929 Only)
= 1mA (LTC1929 Only)
DIFFOUT
< 30V (LTC1929 Only)
= 0V (LTC1929 Only)
< 3V (LTC1929 Only)
RUN/SS
10
V
V
FREQ = 200kHz
IN
OUT
= 12V
< 10V
= 2V
= 5V unless otherwise noted.
1929 G02
100
100
90
80
70
60
50
5
Efficiency vs V
(Figure 13)
V
I
OUT
EXTVCC
MIN
70
70
10
10
MAX
0
= 20A
(see minimum on-time
= 5V
10
5000
TYP
V
30
90
90
35
11
2
5
V
OUT
OUT
IN
V
IN
= 1.6V
= 2V
(V)
MAX
200
15
3
UNITS
1929 G03
V/mV
MHz
V/ s
mA
nA
dB
dB
20
V
V