- 您现在的位置：买卖IC网 > PDF目录20674 > MAX1765EEE+ (Maxim Integrated)IC REG DL BST/LINEAR SYNC 16QSOP PDF资料下载
参数资料
| 型号： | MAX1765EEE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/19页 |
| 文件大小： | 867K |
| 描述： | IC REG DL BST/LINEAR SYNC 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 拓扑： | 升压（升压）同步（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 2 |
| 频率 - 开关： | 1MHz |
| 电压/电流 - 输出 1： | 2.5 V ~ 5.5 V，800mA |
| 电压/电流 - 输出 2： | 2.85V/可调，500mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 0.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
Detailed Description
The MAX1765 is a highly efficient, low-noise power
supply for portable RF hand-held instruments. This
boost power supply combines an LDO linear regulator,
a low-noise, high-power, step-up switching regulator,
an N-channel power MOSFET, a P-channel synchro-
nous rectifier, shutdown control, and a precision volt-
age reference in a single 16-pin QSOP or a thermally
enhanced TSSOP-EP (Figure 1).
The switching DC-DC converter boosts a 1-cell to 3-cell
NiMH/NiCd or a single Li+ battery input to an adjustable
output voltage between 2.5V and 5.5V. The MAX1765
guarantees startup with voltages as low as 1.1V and will
remain operational down to 0.7V (Figure 2). The internal
LDO regulator provides linear postregulation for noise-
sensitive circuitry, or it can be used as a separate volt-
age output adjustable from 1.25V up to POUT.
The MAX1765 is optimized for use in cellular phones and
other applications requiring low noise during full-power
operation, as well as low quiescent current for maximum
battery life during standby and shutdown. The device
automatically transitions to a low-quiescent-current
pulse-skipping control scheme during light loads that
reduces the quiescent power consumption to 360礧.
The supply current of the device can be further reduced
to 1礎 when the device is shut down. Figure 2 shows a
typical application of the MAX1765 in normal mode.
The switching regulator supports two low-noise modes:
fixed-frequency PWM for low noise in all load conditions,
and synchronization of the internal oscillator to an
external clock driving the CLK input. In TRACK mode,
the DC and linear regulator work together to maintain
excellent PSRR without excessive efficiency loss.
Additional MAX1765 features include synchronous rec-
tification for high efficiency and increased battery life,
dual boost shutdown controls for 礟 or a pushbutton
momentary switch, and a separate shutdown control for
the linear regulator.
Step-Up Converter
During DC-DC converter operation, the internal N-chan-
nel MOSFET turns on for the first part of each cycle,
allowing current to ramp up in the inductor and store
energy in a magnetic field. During the second part of
each cycle, the MOSFET turns off and inductor current
flows through the synchronous rectifier to the output filter
capacitor and the load. As the energy stored in the
inductor is depleted, the current ramps down and the
synchronous rectifier turns off. The CLK/SEL pin deter-
mines whether a pulse-skipping or PWM control method
is used at light loads (Table 1).
Normal Operation
Pulling CLK/SEL low selects the MAX1765s normal
operating mode. In this mode, the device operates in
PWM when driving medium to heavy loads and auto-
matically switches to SKIP mode if the load requires
less power. SKIP mode allows higher efficiency than
PWM under light-load conditions.
800mA, Low-Noise, Step-Up DC-DC Converter
with 500mA Linear Regulator
10 ______________________________________________________________________________________
PIN NAME
FUNCTION
9
ONB ON Input. When low, the DC-DC is operational (Table 2).
10 PGND Power Ground
11
LX Inductor connection to the drain of P-channel synchronous rectifier and N-channel switch.
12 POUT
Boost Converter Power Output. POUT is the source of the P-channel synchronous-rectifier MOSFET
switch. Connect POUT to INL. Bypass POUT to PGND with a 100礔 capacitor.
13
INL
Linear Regulator Power Input. Source of PFET pass device connected between INL and OUTL. Connect
INL to POUT.
14 OUTL Linear Regulator Output. OUTL can source up to 500mA. Bypass OUTL to GND with a 4.7礔 capacitor.
15 TRACK
Track-Mode Control Input for DC-DC Converter. In track mode, the boost converter output is sensed at
OUT and set to 0.5V above OUTL to improve efficiency. Set TRACK to OUT for track mode and to GND
for normal operation (Table 2).
16
ONL
Linear Regulator ON Input. Enables the linear regulator output when TRACK = LOW. ONA and ONB
determine the linear regulators output state when TRACK = HIGH.
EP Exposed Pad (TSSOP Only). Internally connected to GND and PGND. Connect to a large ground plane.
Pin Description (continued)
相关PDF资料 |
PDF描述 |
|---|---|
| GBB09DHFN | CONN CARDEDGE 18POS .050" SMD |
| EL7252CSZ-T7 | IC DRIVER MOSFET DUAL HS 8-SOIC |
| VI-J4X-CX-F3 | CONVERTER MOD DC/DC 5.2V 75W |
| ISL9104IRUFEVAL1Z | EVAL BOARD 1 FOR ISL9104IRUF |
| MAX4210EETT+T | IC CURRENT MONITOR 1.5% 6TDFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1765EEE+ | 功能描述:直流/直流开关转换器 800mA Step-Up w/500mA Linear Reg 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 |
| MAX1765EEE+T | 功能描述:直流/直流开关转换器 800mA Step-Up w/500mA Linear Reg 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 |
| MAX1765EEE-T | 功能描述:直流/直流开关转换器 800mA Step-Up w/500mA Linear Reg 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 |
| MAX1765EUE | 功能描述:直流/直流开关转换器 800mA Step-Up w/500mA Linear Reg 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 |
| MAX1765EUE+ | 功能描述:直流/直流开关转换器 800mA Step-Up w/500mA Linear Reg 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 |
发布紧急采购，3分钟左右您将得到回复。