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参数资料
| 型号： | LTC1159IS-5#TR |
| 厂商： | Linear Technology |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 100% |
| 电源电压： | 4 V ~ 40 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC1159IS-5TR LTC1159IS5TR |
LTC1159
LTC1159-3.3/LTC1159-5
TYPICAL PERFOR A CE CHARACTERISTICS
600
EXTV CC Switch Drop
80
Off-Time vs V OUT
160
Current Sense Threshold Voltage
500
400
300
200
70
60
50
40
30
20
140
120
100
80
60
40
MAXIMUM
THRESHOLD
MINIMUM
100
10
LTC1159-5
20
THRESHOLD
0
0
5 10 15
20
0
0
LTC1159-3.3
1 2
3 4
5
0
0
20
40
60
80
100
SWITCH CURRENT (mA)
LTC1159 ? TPC07
PI FU CTIO S
OUTPUT VOLTAGE (V)
LTC1159 ? TPC08
TEMPERATURE ( ° C)
LTC1159 ? TPC09
V IN : Main Supply Input Pin.
SGND: Small-Signal Ground. Must be routed separately
from other grounds to the (–) terminal of C OUT .
PGND: Driver Power Grounds. Connect to source of N-
channel MOSFET and the (–) terminal of C IN .
V CC : Outputs of internal 4.5V linear regulator, EXTV CC
switch, and supply inputs for driver and control circuits.
The driver and control circuits are powered from the higher
of the 4.5V regulator or EXTV CC voltage. Must be closely
decoupled to power ground.
C T : External capacitor C T from this pin to ground sets the
operating frequency. (The frequency is also dependent on
the ratio V OUT /V IN .)
I TH : Gain Amplifier Decoupling Point. The current com-
parator threshold increases with the I TH pin voltage.
V FB : For the LTC1159 adjustable version, the V FB pin
receives the feedback voltage from an external resistive
divider used to set the output voltage.
SENSE – : Connects to internal resistive divider which sets
the output voltage in fixed output versions. The SENSE – pin
SENSE + : The (+) Input for the Current Comparator. A built-
in offset between the SENSE + and SENSE – pins, in conjunc-
tion with R SENSE , sets the current trip threshold.
N-Gate: High Current Drive for the Bottom N-Channel
MOSFET. The N-Gate pin swings from ground to V CC .
P-Gate: Level-Shifted Gate Drive Signal for the Top
P-Channel MOSFET. The voltage swing at the P-gate pin is
from V IN to V IN – V CC .
P-Drive: High Current Gate Drive for the Top P-Channel
MOSFET. The P-drive pin(s) swing(s) from V CC to ground.
CAP: Charge Compensation Pin. A capacitor to V CC pro-
vides charge required by the P-gate level-shift capacitor
during supply transitions. The charge compensation ca-
pacitor must be larger than the gate drive capacitor.
SHDN1: This pin shuts down the control circuitry only (V CC
is not affected). Taking SHDN1 pin high turns off the
control circuitry and holds both MOSFETs off. This pin
must be at ground potential for normal operation.
SHDN2: Master Shutdown Pin. Taking SHDN2 high shuts
down V CC and all control circuitry.
is also the (–) input of the current comparator.
5
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