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參數(shù)資料
| 型號(hào)： | LT1622 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low Input Voltage Current Mode Step-Down DC/DC Controller(低輸入電壓，電流模式步降DC/DC控制器) |
| 中文描述： | 低輸入電壓電流模式降壓DC / DC控制器（低輸入電壓，電流模式步降直流/直流控制器） |
| 文件頁(yè)數(shù)： | 4/16頁(yè) |
| 文件大小： | 223K |
| 代理商： | LT1622 |
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4
LTC1622
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
PI
FU
CTIO
N
S
U
U
SENSE
–
(Pin 1):
The Negative Input to the Current Com-
parator.
I
TH
(Pin 2):
Error Amplifier Compensation Point. The
current comparator threshold increases with this control
voltage. Nominal voltage range for this pin is 0V to 1.2V.
V
FB
(Pin 3):
Receives the feedback voltage from an exter-
nal resistive divider across the output capacitor.
RUN/SS (Pin 4):
Combination of Soft-Start and Run
Control Inputs. A capacitor to ground at this pin sets the
ramp time to full output current. The time is approximately
0.45s/
μ
F. Forcing this pin below 0.4V causes all circuitry
to be shut down.
SYNC/MODE (Pin 5):
This pin performs three functions.
Greater than 2V on this pin allows Burst Mode operation
at low load currents, while grounding or applying a clock
signal on this pin defeats Burst Mode operation. An
external clock between 625kHz and 750kHz applied to this
pin forces the LTC1622 to operate at the external clock
frequency. Do not attempt to synchronize below 625kHz
Pin 5 has an internal 1
μ
A pull-up current source.
GND (Pin 6):
Ground Pin.
PDRV (PIN 7):
Gate Drive for the External P-Channel
MOSFET. This pin swings from 0V to V
IN
.
V
IN
(Pin 8):
Main Supply Pin. Must be closely decoupled
to ground Pin 6.
LOAD CURRENT (mA)
1
E
100
90
80
70
60
50
40
10
100
1622 G07
1000
V
OUT
= 2.5V
R
SENSE
= 0.03
V
IN
= 3.3V
V
IN
= 4.2V
V
IN
= 8.4V
V
IN
= 6V
Efficiency vs Load Current for
Figure 1 with Burst Mode
Operation Defeated
Load Step Transient Response
Burst Enabled
I
LOAD
= 50mA TO 1.2A
V
IN
= 4.2V
1622 G08
I
LOAD
= 50mA TO 1.2A
V
IN
= 4.2V
1622 G09
Load Step Transient Response
Burst Inhibited
1
1
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