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参数资料
| 型号： | LTC3832-1ES8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 360kHz |
| 占空比： | 95% |
| 电源电压： | 3 V ~ 8 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 ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LTC3832/LTC3832-1
APPLICATIO S I FOR ATIO
V CC
PV CC2
PV CC1
G1
V IN
Q1
Figure 8 shows a tripling charge pump circuit that can be
used to provide 2V IN and 3V IN gate drive for the external
top and bottom MOSFETs respectively. These should fully
INTERNAL
CIRCUITRY
G2
Q2
L O
+
V OUT
C OUT
enhance MOSFETs with 5V logic level thresholds. This
circuit provides 3V IN – 3V F to PV CC1 while Q1 is ON and
2V IN – 2V F to PV CC2 where V F is the forward voltage of the
Schottky diodes. The circuit requires the use of Schottky
LTC3832
Figure 6. LTC3832 Power Supplies
3832 F6
diodes to minimize forward drop across the diodes at
start-up. The tripling charge pump circuit can rectify any
ringing at the drain of Q2 and provide more than 3V IN at
PV CC1 ; a 12V zener diode should be included from PV CC1
V CC /PV CC2
PV CC1
V IN
to PGND to prevent transients from damaging the circuitry
at PV CC1 or the gate of Q1.
INTERNAL
CIRCUITRY
G1
G2
Q1
Q2
L O
+
V OUT
C OUT
The charge pump capacitors for PV CC1 refresh when the
G2 pin goes high and the switch node is pulled low by Q2.
The G2 on-time becomes narrow when LTC3832/
LTC3832-1 operates at a maximum duty cycle (95%
typical), which can occur if the input supply rises more
LTC3832-1
Figure 7. LTC3832-1 Power Supplies
3832 F7
slowly than the soft-start capacitor or if the input voltage
droops during load transients. If the G2 on-time gets so
narrow that the switch node fails to pull completely to
ground, the charge pump voltage may collapse or fail to
In many applications, V CC can be powered from V IN
through an RC filter. This supply can be as low as 3V. The
low quiescent current (typically 800 μ A) allows the use of
relatively large filter resistors and correspondingly small
filter capacitors. 100 ? and 4.7 μ F usually provide ad-
equate filtering for V CC . For best performance, connect the
4.7 μ F bypass capacitor as close to the LTC3832 V CC pin as
possible.
Gate drive for the top N-channel MOSFET Q1 is supplied
start, causing excessive dissipation in external MOSFET,
Q1. This condition is most likely with low V CC voltages and
high switching frequencies, coupled with large external
MOSFETs which slow the G2 and switch node slew rates.
The LTC3832/LTC3832-1 overcome this problem by sens-
ing the PV CC1 voltage when G1 is high. If PV CC1 is less than
2.5V above V CC , the maximum G1 duty cycle is reduced to
70% by clamping the COMP pin at 1.8V (QC in the Block
from PV CC1 . This supply must be above V IN (the main
power supply input) by at least one power MOSFET V GS(ON)
D Z
12V
1N5242
1N5817
1N5817
V IN
1N5817
for efficient operation. An internal level shifter allows PV CC1
to operate at voltages above V CC and V IN , up to 14V maxi-
mum. This higher voltage can be supplied with a separate
supply, or it can be generated using a charge pump.
10 μ F
PV CC2
PV CC1
G1
0.1 μ F
0.1 μ F
Q1
L O
Gate drive for the bottom MOSFET Q2 is provided through
V OUT
PV CC2 for the LTC3832 or V CC /PV CC2 for the LTC3832-1.
This supply only needs to be above the power MOSFET
V GS(ON) for efficient operation. PV CC2 can also be driven
LTC3832
G2
Q2
+
C OUT
3832 F08
from the same supply/charge pump for the PV CC1 , or it can
be connected to a lower supply to improve efficiency.
Figure 8. Tripling Charge Pump
sn3832 3832fs
12
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| LTC3832EGN | 功能描述:IC REG CTRLR BUCK PWM VM 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3832EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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