參數(shù)資料
型號(hào)： LTC1159IS-3.3
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 0.05 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 0.150 INCH, PLASTIC, SO-16
文件頁(yè)數(shù)： 6/20頁(yè)
文件大?。?/td> 288K
代理商： LTC1159IS-3.3
6
LTC1159
LTC1159-3.3/LTC1159-5
Internal divider broken at V
FB
for adjustable versions.
–
+
N-GATE
P-DRIVE
V
CC
550k
P-GATE
PGND
550k
CAP
LOW DROP SWITCH
V
CC
EXTV
CC
SHDN2
V
IN
–
+
–
+
SENSE
+
V
R
S
Q
V
TH1
–
+
25mV TO 150mV
13k
G
REFERENCE
1.25V
SGND
I
TH
C
V
OS
SENSE
–
LTC1159 FD
SHDN1
–
+
T
V
TH2
S
SLEEP
C
T
V
FB
OFF-TIME
CONTROL
SENSE
–
LOW DROPOUT
4.5V REGULATOR
100k
FU
W
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
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
(Refer to Functional Diagram)
OPERATIOU
相關(guān)PDF資料
PDF描述
LTC1159IS-5 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LTC1174 High Efficiency Step-Down and Inverting DC/DC Converter(高效率,反相DC/DC變換器)
LTC1174-3.3 High Efficiency Step-Down and Inverting DC/DC Converter(高效率,步降DC/DC變換器)
LTC1174-5 High Efficiency Step-Down and Inverting DC/DC Converter(高效率,步降DC/DC變換器)
LTC1177-12 Isolated High Side MOSFET Drivers(隔離型高邊MOS場(chǎng)效應(yīng)管驅(qū)動(dòng)器（輸入電流2.5mA）)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1159IS-5 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1159IS-5#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1159IS-5#TR 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1159IS-5#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1160CN 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Interface IC
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