参数资料
型号: LTC1438XCG
厂商: Linear Technology
文件页数: 7/32页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 28-SSOP
标准包装: 47
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:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 70°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 管件
LTC1438/LTC1439
TYPICAL PERFOR M A N CE CHARACTERISTICS
Auxiliary Regulator
20
Sink Current Available
70
Auxiliary Regulator PSRR
10mA LOAD
60
15
50
100mA LOA D
10
40
30
5
20
0
10
0
2
4
6 8
10 12
14
16
10
100
1000
AUX DR VOLTAGE (V)
1438 G19
PI N FU N CTIO N S
V IN : Main Supply Pin. Must be closely decoupled to the
IC’s signal ground pin.
INTV CC : Output of the Internal 5V Regulator and the
EXTV CC Switch. The driver and control circuits are pow-
ered from this voltage. Must be closely decoupled to
power ground with a minimum of 2.2 μ F tantalum or
electrolytic capacitor. The INTV CC regulator turns off when
both RUN/SS1 and RUN/SS2 are low. Refer to the LTC1538/
LTC1539 for 5V keep-alive applications.
EXTV CC : External Power Input to an Internal Switch. This
switch closes and supplies INTV CC, bypassing the internal
low dropout regulator whenever EXTV CC is higher than
4.7V. Connect this pin to V OUT of the controller with the
higher output voltage. Do not exceed 10V on this pin. See
EXTV CC connection in Applications Information section.
BOOST 1, BOOST 2: Supplies to the Topside Floating
FREQUENCY (kHz)
1438 G20
SGND: Small-Signal Ground. Common to both control-
lers, must be routed separately from high current grounds
to the (–) terminals of the C OUT capacitors.
PGND: Driver Power Ground. Connects to sources of
bottom N-channel MOSFETs and the (–) terminals of C IN .
SENSE – 1, SENSE – 2: Connects to the (–) input for the
current comparators. Except for the LTC1438-ADJ, SENSE –
1 is internally connected to the first controller’s V OUT
sensing point. The first controller can only be used as a
3.3V or 5.0V regulator controlled by the V PROG1 pin with
the LTC1438, LTC1438X and LTC1439. The LTC1438-ADJ
Controller 1 implements a remote sensing adjustable
regulator. The second controller can be set to a 3.3V, 5.0V
or an adjustable regulator controlled by the V PROG2 pin
(see Table 1).
Table 1. Output Voltage Table
Drivers. The bootstrap capacitors are returned to these
LTC1438-ADJ
LTC1438/LTC1438X
LTC1439
pins. Voltage swing at these pins is from INTV CC to
Controller 1
Adjustable Only
5V or 3.3V Only
V IN + INTV CC .
Secondary Feedback Loop
SW1, SW2: Switch Node Connections to Inductors. Volt-
age swing at these pins is from a Schottky diode (external)
Controller 2
Adjustable Only
Remote Sensing
POR2 Output
Adjustable Only
Remote Sensing
POR2 Output
5V/3.3V/Adjustable
Remote Sensing
POR2 Output
voltage drop below ground to V IN .
14389fb
7
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LTC1438XCG#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-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
LTC1438XCG#TR 功能描述:IC REG CTRLR BUCK PWM CM 28-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
LTC1438XCG#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-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
LTC1439CG 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:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 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-TSSOP(0.173",4.40mm 宽) 包装:带卷 (TR)
LTC1439CG#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:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 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-TSSOP(0.173",4.40mm 宽) 包装:带卷 (TR)