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参数资料
| 型号： | LTC1159CG-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 20-SSOP |
| 标准包装： | 66 |
| 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： | 0°C ~ 70°C |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
LTC1159
LTC1159-3.3/LTC1159-5
FU CTIO AL DIAGRA
Internal divider broken at V FB for adjustable versions.
V IN
V CC
P-GATE
SHDN2
EXTV CC
LOW DROPOUT
4.5V REGULATOR
LOW DROP SWITCH
CAP
V CC
550k
550k
P-DRIVE
N-GATE
R
V
PGND
SENSE +
SENSE –
SLEEP
Q
S
V TH1
C
25mV TO 150mV
V OS
+
T
13k
G
100k
S
–
V TH2
1.25V
V FB
LTC1159 ? FD
OFF-TIME
CONTROL
SENSE –
SGND
REFERENCE
SHDN1
C T
I TH
OPERATIO
(Refer to Functional Diagram)
The LTC1159 uses a current mode, constant off-time
architecture to synchronously switch an external pair of
complementary power MOSFETs. Operating frequency is
set by an external capacitor at the C T pin.
The output voltage is sensed either by an internal voltage
divider connected to the SENSE – pin (LTC1159-3.3 and
LTC1159-5) or an external divider returned to the V FB pin
(LTC1159). A voltage comparator V, and a gain block G,
compare the divided output voltage with a reference volt-
age of 1.25V. To optimize efficiency, the LTC1159 auto-
matically switches between two modes of operation, burst
and continuous.
A low dropout 4.5V regulator provides the operating volt-
age V CC for the MOSFET drivers and control circuitry during
start-up. During normal operation, the LTC1159 family
powers the drivers and control from the output via the
EXTV CC pin to improve efficiency. The N-GATE pin is
referenced to ground and drives the N-channel MOSFET
gate directly. The P-channel gate drive must be referenced
to the main supply input V IN , which is accomplished by
6
level-shifting the P-drive signal via an internal 550k resistor
and external capacitor.
During the switch “ON” cycle in continuous mode, current
comparator C monitors the voltage between the SENSE +
and SENSE – pins connected across an external shunt in
series with the inductor. When the voltage across the shunt
reaches its threshold value, the P-gate output is switched
to V IN , turning off the P-channel MOSFET. The timing
capacitor C T is now allowed to discharge at a rate deter-
mined by the off-time controller. The discharge current is
made proportional to the output voltage to model the
inductor current, which decays at a rate which is also
proportional to the output voltage. While the timing
capacitor is discharging, the N-gate output is high, turning
on the N-channel MOSFET.
When the voltage on C T has discharged past V TH1 , compara-
tor T trips, setting the flip-flop. This causes the N-gate output
to go low (turning off the N-channel MOSFET) and the P-
gate output to also go low (turning the P-channel MOSFET
back on). The cycle then repeats. As the load current
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1159CN | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1159CN-3.3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1159CN-5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1159CS | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1159CS#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 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:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
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