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参数资料
| 型号： | LTC1625CS#TR |
| 厂商： | Linear Technology |
| 文件页数： | 13/24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： | 165kHz |
| 占空比： | 99% |
| 电源电压： | 3.7 V ~ 36 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： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LTC1625
APPLICATIO N S I N FOR M ATIO N
High input voltage applications in which large MOSFETs
are being driven at high frequencies may cause the LTC1625
to exceed its maximum junction temperature rating. Most
of the supply current drives the MOSFET gates unless an
external EXTV CC source is used. The junction temperature
can be estimated from the equations given in Note 2 of the
Electrical Characteristics. For example, the LTC1625CGN
is limited to less than 14mA from a 30V supply:
T J = 70 ° C + (14mA)(30V)(130 ° C/W) = 125 ° C
To prevent the maximum junction temperature from being
exceeded, the input supply current must be checked when
operating in continuous mode at high V IN .
3. EXTV CC connected to an output-derived boost network.
For 3.3V and other low voltage regulators, efficiency
gains can still be realized by connecting EXTV CC to an
output-derived voltage which has been boosted to
greater than 4.7V. This can be done with either an
inductive boost winding as shown in Figure 5a or a
capacitive charge pump as shown in Figure 5b.
4. EXTV CC connected to an external supply. If an external
supply is available in the 5V to 7V range (EXTV CC < V IN ),
it may be used to power EXTV CC providing it is compat-
ible with the MOSFET gate drive requirements.
EXTV CC Connection
The LTC1625 contains an internal P-channel MOSFET
V IN
TK
+
V IN
C IN
1N4148
V SEC
switch connected between the EXTV CC and INTV CC pins.
Whenever the EXTV CC pin is above 4.7V the internal 5.2V
regulator shuts off, the switch closes and INTV CC power is
supplied via EXTV CC until EXTV CC drops below 4.5V. This
OPTIONAL
EXTV CC
CONNECTION
5V < V SEC < 7V
R4
LTC1625
EXTV CC
FCB
TG
SW
T1
1:N
? +
+
C SEC
1 μ F
V OUT
C OUT
allows the MOSFET gate drive and control power to be
derived from the output or other external source during
normal operation. When the output is out of regulation
(start-up, short circuit) power is supplied from the internal
R3
SGND
BG
PGND
1625 F05a
regulator. Do not apply greater than 7V to the EXTV CC pin
and ensure that EXTV CC ≤ V IN .
Figure 5a: Secondary Output Loop and EXTV CC Connection
Significant efficiency gains can be realized by powering
INTV CC from the output, since the V IN current supplying
the driver and control currents will be scaled by a factor of
Duty Cycle/Efficiency. For 5V regulators this simply means
connecting the EXTV CC pin directly to V OUT . However, for
3.3V and other lower voltage regulators, additional cir-
cuitry is required to derive INTV CC power from the output.
The following list summarizes the four possible connec-
tions for EXTV CC :
V PUMP ≈ 2(V OUT – V D )
V IN
TK
TG
LTC1625
SW
EXTV CC
BG
+
V IN
C IN
BAT85
L1
+
1 μ F
0.22 μ F
VN2222LL
+
BAT85
BAT85
V OUT
C OUT
1. EXTV CC left open (or grounded). This will cause INTV CC
to be powered from the internal 5.2V regulator resulting
in an efficiency penalty of up to 10% at high input
voltages.
PGND
Figure 5b: Capacitive Charge Pump for EXTV CC
1625 F05b
2. EXTV CC connected directly to V OUT . This is the normal
connection for a 5V regulator and provides the highest
efficiency.
13
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相关代理商/技术参数 |
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| LTC1625IGN | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP 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 |
| LTC1625IGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC1625IGN#TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP 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 |
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| LTC1625IGNPBF | 制造商:Linear Technology 功能描述:No RSENSE Current Mode Regulator SSOP16 |
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