參數(shù)資料
型號(hào)： LT1111-5
廠商： Linear Technology Corporation
英文描述： Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
中文描述： 微功率DC / DC轉(zhuǎn)換可調(diào)和固定5V，12V的
文件頁(yè)數(shù)： 6/16頁(yè)
文件大?。?/td> 337K
代理商： LT1111-5
6
LT1111
Gain block A2 can serve as a low-battery detector. The
negative input of A2 is the 1.25V reference. A resistor
divider from V
IN
to GND, with the mid-point connected to
the SET pin provides the trip voltage in a low-battery
detector application. AO can sink 300
μ
A (use a 22k
resistor pull-up to 5V).
A resistor connected between the I
LIM
pin and V
IN
sets
maximum switch current. When the switch current ex-
ceeds the set value, the switch cycle is prematurely
terminated. If current limit is not used, I
LIM
should be tied
directly to V
IN
. Propagation delay through the current limit
circuitry is approximately 1
μ
s.
In step-up mode the switch emitter (SW2) is connected to
ground and the switch collector (SW1) drives the induc-
tor; in step-down mode the collector is connected to V
IN
and the emitter drives the inductor.
The LT1111-5 and LT1111-12 are functionally identical to
the LT1111. The -5 and -12 versions have on-chip voltage
setting resistors for fixed 5V or 12V outputs. Pin 8 on the
fixed versions should be connected to the output. No
external resistors are needed.
U
LT11
O
ATI
11OPER
The LT1111 is a gated oscillator switcher. This type
architecture has very low supply current because the
switch is cycled when the feedback pin voltage drops
below the reference voltage. Circuit operation can best be
understood by referring to the LT1111 block diagram.
Comparator A1 compares the feedback (FB) pin voltage
with the 1.25V reference signal. When FB drops below
1.25V, A1 switches on the 72kHz oscillator. The driver
amplifier boosts the signal level to drive the output NPN
power switch. The switch cycling action raises the output
voltage and FB pin voltage. When the FB voltage is suffi-
cient to trip A1, the oscillator is gated off. A small amount
of hysteresis built into A1 ensures loop stability without
external frequency compensation. When the comparator
output is low, the oscillator and all high current circuitry is
turned off, lowering device quiescent current to just 300
μ
A.
The oscillator is set internally for 7
μ
s ON time and 7
μ
s OFF
time, optimizing the device for circuits where V
OUT
and V
IN
differ by roughly a factor of 2. Examples include a 3V to 5V
step-up converter or a 9V to 5V step-down converter.
W
IAGRA
BLOCK
S
LT1111 BD01
IN
V
GND
SET
A0
A2
1.25V
REFERENCE
A1
OSCILLATOR
DRIVER
SW1
SW2
LIM
I
GAIN BLOCK/
ERROR AMP
COMPARATOR
+
–
+
–
FB
LT1111-5/LT1111-12
LT1111
LT1111 BD02
IN
V
GND
SET
A0
A2
1.25V
REFERENCE
A1
OSCILLATOR
DRIVER
R1
SW1
SW2
LIM
I
R2
220k
SENSE
LT1111-5:
LT1111-12:
R1 = 73.5k
R1 = 25.5k
GAIN BLOCK/
ERROR AMP
COMPARATOR
+
–
+
–
相關(guān)PDF資料
PDF描述
LT1111 Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
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LT1111CN8 Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
LT1111CN8-5 Dual 4-Input Positive-NAND Gates 14-SOIC 0 to 70
LT1111CS8 Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1111C 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
LT1111CJ8 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 2V to 30V 8-Pin CDIP
LT1111CN8 功能描述:IC REG BUCK BST INV ADJ .4A 8DIP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:升壓（升壓） 輸出類(lèi)型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC
LT1111CN8#PBF 功能描述:IC REG BUCK BST INV ADJ .4A 8DIP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱(chēng):296-25628-2
LT1111CN8-12 功能描述:IC REG BUCK BST INV 12V .4A 8DIP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:MIC23xxx HyperLight Load™ Regulators 標(biāo)準(zhǔn)包裝:5,000 系列:HyperLight Load® 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:1.8V 輸入電壓:2.7 V ~ 5.5 V PWM 型:混合物 頻率 - 開(kāi)關(guān):4MHz 電流 - 輸出:2A 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤(pán)，8-MLF? 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-MLF?（2x2） 產(chǎn)品目錄頁(yè)面:1094 (CN2011-ZH PDF) 其它名稱(chēng):576-3303-2
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