- 您现在的位置：买卖IC网 > PDF目录1839 > MAX1703ESE (Maxim Integrated Products)IC REG BOOST SYNC 5V/ADJ 16SOIC PDF资料下载
参数资料
| 型号： | MAX1703ESE |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC 5V/ADJ 16SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 5V，2.5 V ~ 5.5 V |
| 输入电压： | 0.7 V ~ 5.5 V |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-SOIC |
| 其它名称： | Q1159627 |
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
Shutdown
The MAX1703 shuts down to reduce quiescent current
to 1μA. During shutdown ( ON = V OUT ), the reference,
low-battery comparator, gain block, and all feedback
and control circuitry are off. The boost converter’s out-
put drops to one Schottky diode drop below the input.
Power-Good (POK) Comparator
The MAX1703 features an uncommitted POK compara-
tor. The internal POK comparator has an open-drain
output (POK) capable of sinking 1mA. When the input
(POKIN) rises above the 1.25V reference, the POK
open-drain output turns off. The POKIN input has 10mV
of hysteresis.
To provide a power-good signal, connect the POKIN
input to an external resistor-divider between OUT and
GND (Figure 5). Calculate the resistor values as follows:
R3 = R4(V TH / V REF - 1)
where V TH is the desired input voltage trip threshold.
Since the input bias current into POKIN is less than
20nA, R4 can be a large value (such as 270k ? or less)
without sacrificing accuracy. Connect the resistor volt-
age-divider as close to the IC as possible, within 0.2in.
(5mm) of POKIN.
V IN
Reference
The MAX1703 has an internal 1.250V, 1% bandgap ref-
erence. Connect a 0.22μF bypass capacitor to GND
within 0.2in. (5mm) of the REF pin. REF can source up
to 50μA of external load current.
Gain Block
The MAX1703 gain block can function as a second
comparator, or can be used to build a linear regulator
using an external P-channel MOSFET pass device. The
gain-block output is a single-stage transconductance
amplifier that drives an open-drain N-channel MOSFET.
The g m of the entire gain-block stage is 10mmho.
Figure 6 shows the gain block used in a linear-regulator
application. The output of an external P-channel pass
element is compared to the internal reference. The dif-
ference is amplified and used to drive the gate of the
pass element. Use a logic-level PFET, such as an
NDS336P (R DS(ON) = 270m ? ) from Fairchild. This con-
figuration allows ripple reduction at the output. If a
lower R DS(ON) PFET is used, then the linear regulator
output filter capacitance may need to be increased.
To use the gain block as a comparator, refer to the
Power-Good (POK) Comparator section.
V IN
R5
10 ?
MAX1703
R3
R4
L1
4.7 μ H
CLK/SEL
LXP, LXN
POUT
MAX1703
ON
OUT
AIN
AO
POKIN
POK
REF
FB
C1
100 μ F
MBR0520L
D1
C5
0.22 μ F
C2
0.22 μ F
R1
OUTPUT
C4
2 x 220 μ F
R3
R4
CLK/SEL
ON
AIN
POKIN
REF
L1
4.7 μ H
LXP, LXN
POUT
OUT
AO
POK
FB
C1
100 μ F
MBR0520L
C4
330 μ F
R5
10 ? C5
0.22 μ F
C2
0.22 μ F
R1
R6
20k
P
BOOST
OUTPUT
LINEAR
REGULATED
OUTPUT
47 μ F
C3
0.22 μ F
PGND
GND
R2
SIGNAL GROUND
PGND
GND
R2
100k
SIGNAL GROUND
NOTE: HEAVY LINES INDICATE HIGH-CURRENT PATHS.
Figure 5. Adjustable Output (PWM Mode)
POWER GROUND
POWER GROUND
Figure 6. Using the Gain Block as a Linear Regulator
______________________________________________________________________________________
11
相关PDF资料 |
PDF描述 |
|---|---|
| MAX17041G+T | IC 2-WIRE FG W/MODEL GAUGE |
| MAX17044G+T | IC FUEL GAUGE LI-ION 8-TDFN |
| MAX17049G+ | IC FUEL/GAS GAUGE LI-ION 8TDFN |
| MAX17062ETB+T | IC TFT-LCD DC/DC CONV 10-TDFN |
| MAX17067EUA+T | IC REG BOOST ADJ 0.3A 8UMAX |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1703ESE+ | 功能描述:直流/直流开关转换器 1-3 Cell 1A Step-Up DC/DC Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1703ESE+T | 功能描述:直流/直流开关转换器 1-3 Cell 1A Step-Up DC/DC Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1703ESE-T | 功能描述:直流/直流开关转换器 1-3 Cell 1A Step-Up DC/DC Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1703EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX1703 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX17040EVKIT+ | 制造商:Maxim Integrated Products 功能描述:MAX17040G+ EVAL KIT - Boxed Product (Development Kits) |
发布紧急采购，3分钟左右您将得到回复。