參數(shù)資料
型號(hào)： LTC1436AIGN
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： 2 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO24
封裝： 0.150 INCH, PLASTIC, SSOP-24
文件頁(yè)數(shù)： 18/28頁(yè)
文件大?。?/td> 518K
代理商： LTC1436AIGN
18
LTC1436A
LTC1436-PLL-A/LTC1437A
APPLICATIO
S I
FOR
ATIO
U
The output of the phase detector is a complementary pair
of current sources charging or discharging the external
filter network on the PLL LPF pin. The relationship
between the PLL LPF pin and operating frequency is
shown in Figure 7. A simplified block diagram is shown in
Figure 8.
If the external frequency (f
PLLIN
) is greater than the oscil-
lator frequency (f), current is sourced continuously, pull-
ing up the PLL LPF pin. When the external frequency is less
than f
OSC
, current is sunk continuously, pulling down the
PLL LPF pin. If the external and internal frequencies are the
same but exhibit a phase difference, the current sources
turn on for an amount of time corresponding to the phase
W
U
U
difference. Thus the voltage on the PLL LPF pin is adjusted
until the phase and frequency of the external and internal
oscillators are identical. At this stable operating point the
phase comparator output is open and the filter capacitor
C
LP
holds the voltage.
The loop filter components C
LP
and R
LP
smooth out the
current pulses from the phase detector and provide a
stable input to the voltage-controlled oscillator. The filter
components C
LP
and R
LP
determine how fast the loop
acquires lock. Typically, R
LP
= 10k and C
LP
is 0.01
μ
F to
0.1
μ
F. Be sure to connect the low side of the filter to SGND.
The PLL LPF pin can be driven with external logic to obtain
a 1:1.9 frequency shift. The circuit shown in Figure 9 will
provide a frequency shift from f
O
to 1.9f
O
as the voltage
and V
PLLLPF
increases from 0V to 2.4V. Do not exceed 2.4V
on V
PLLLPF
.
Figure 7. Operating Frequency vs V
PLLLPF
PLL LPF
2.4V MAX
3.3V OR 5V
1436 F09
18k
Figure 9. Directly Driving PLL LPF Pin
Low-Battery Comparator
The LTC1436A/LTC1437A have an on-chip low-battery
comparator which can be used to sense a low-battery
condition when implemented as shown in Figure 10. The
resistive divider R3, R4 sets the comparator trip point as
follows:
3
V
V
R
R
LBTRIP
=
+
1 19
1
4
PLLIN
50k
1436 F08
PLL LPF
C
OSC
PHASE
DETECTOR
OSC
R
LP
C
LP
C
OSC
EXTERNAL
FREQUENCY
2.4V
DIGITAL
PHASE/
FREQUENCY
DETECTOR
V
PLLLPF
(V)
0
F1.3f
O
0.7f
O
1436 F07
1.5
2.0
1.0
0.5
2.5
O
Figure 8. Phase-Locked Loop Block Diagram
Figure 10. Low Battery Comparator
–
+
LBI
V
IN
SGND
LBO
R4
R3
1436 F10
1.19V REFERENCE
LTC1436A
LTC1437A
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1436AIGN#PBF 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP 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
LTC1436AIGN#TR 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP 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
LTC1436AIGN#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP 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
LTC1436AIGN-PLL 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP 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
LTC1436AIGN-PLL#PBF 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP 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
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