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参数资料
| 型号： | LTC1539CGW |
| 厂商： | Linear Technology |
| 文件页数： | 16/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 36-SSOP |
| 标准包装： | 32 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 138kHz |
| 占空比： | 99% |
| 电源电压： | 3.5 V ~ 30 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： | 36-BSOP（0.295"，7.50mm 宽） |
| 包装： | 管件 |
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LTC1538-AUX/LTC1539
APPLICATIO N S I N FOR M ATIO N
SFB1
R6
R5
LTC1538-AUX
LTC1539*
V IN
TGL1
EXTV CC
TGS1*
SW1
BG1
SGND PGND
+
C IN
N-CH
V IN
N-CH
N-CH
?
L1
1:1
1N4148
?
V SEC
+
R SENSE
+
1 μ F
V OUT
C OUT
LTC1538-AUX
LTC1539*
V IN
TGL1
TGS1*
EXTV CC
SW1
BG1
+
C IN
N-CH
V IN
N-CH
N-CH
BAT85
L1
0.22 μ F
VN2222LL
R SENSE
+
+
1 μ F
BAT85
BAT85
V OUT
C OUT
OPTIONAL EXTV CC
1538 F04a
*TGS1 ONLY AVAILABLE ON THE LTC1539
PGND
CONNECTION
5V ≤ V SEC ≤ 9V
*TGS1 ONLY AVAILABLE ON THE LTC1539
1538 F04b
Figure 4a. Secondary Output Loop and EXTV CC Connection
greater than 4.8V. This can be done with either the
inductive boost winding as shown in Figure 4a or the
capacitive charge pump shown in Figure 4b. The charge
pump has the advantage of simple magnetics.
Figure 4b. Capacitive Charge Pump for EXTV CC
Output Voltage Programming
The LTC1538-AUX/LTC1539 have pin selectable output
voltage programming. The output voltage is selected by
the V PROG1 (V PROG2 ) pin as follows:
4. EXTV CC connected to an external supply. If an external
supply is available in the 5V to 10V range (EXTV CC ≤ V IN )
it may be used to power EXTV CC providing it is compat-
ible with the MOSFET gate drive requirements. When
V PROG1,2 = 0V
V PROG1,2 = INTV CC
V PROG2 = Open (DC)
V OUT1,2 = 3.3V
V OUT1,2 = 5V
V OUT2 = Adjustable
driving standard threshold MOSFETs, the external sup-
ply must be always present during operation to prevent
MOSFET failure due to insufficient gate drive. Note: care
must be taken when using the connections in items 3 or
4. These connections will effect the INTV CC voltage
when either or both controllers are on.
The top of an internal resistive divider is connected to
SENSE – 1 pin in Controller 1. For fixed output voltage
applications the SENSE – 1 pin is connected to the output
voltage as shown in Figure 5a. When using an external
resistive divider for Controller 2, the V PROG2 pin is left open
SENSE 1
Topside MOSFET Driver Supply (C B ,D B )
External bootstrap capacitors C B connected to the BOOST
1 and BOOST 2 pins supply the gate drive voltages for the
V PROG1
–
LTC1538-AUX
LTC1539
SGND
GND: V OUT = 3.3V
INTV CC : V OUT = 5V
+
V OUT
C OUT
1538 F05a
V PROG2 *
OPEN (DC)
R1
100pF
( )
*LTC1539 ONLY V OUT = 1.19V 1 +
topside MOSFETs. Capacitor C B in the Functional Diagram
is charged through diode D B from INTV CC when the
SW1(SW2) pin is low. When one of the topside MOSFETs
is to be turned on, the driver places the C B voltage across
the gate source of the desired MOSFET. This enhances the
MOSFET and turns on the topside switch. The switch node
voltage SW1(SW2) rises to V IN and the BOOST 1(BOOST
2) pin follows. With the topside MOSFET on, the boost
voltage is above the input supply: V BOOST = V IN + V INTVCC .
The value of the boost capacitor C B needs to be 100 times
that of the total input capacitance of the topside MOSFET(s).
The reverse breakdown on D B must be greater than
V IN(MAX) .
16
Figure 5a. LTC1538-AUX/LTC1539 Fixed Output Applications
1.19V ≤ V OUT ≤ 9V
R2
V OSENSE2
LTC1538-AUX
LTC1539
SGND
1538 F05b
R2
R1
Figure 5b. LTC1538-AUX/LTC1539 Adjustable Applications
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| LTC1539CGW#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-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: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 |
| LTC1539CGW#TR | 功能描述:IC REG CTRLR BUCK PWM CM 36-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 |
| LTC1539CGW#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-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: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 |
| LTC1539IGW | 功能描述:IC REG CTRLR BUCK PWM CM 36-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 |
| LTC1539IGW#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-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: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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