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| 型号： | MAX1897ETP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/33页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 20-TQFN |
| 标准包装： | 60 |
| 系列： | Quick-PWM™ |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 550kHz |
| 电源电压： | 4.5 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： | 0°C ~ 85°C |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 包装： | 管件 |
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Quick-PWM Slave Controllers for
Multiphase, Step-Down Supplies
Pin Description
MAX1887
PIN
MAX1897
NAME
DESCRIPTION
Dual-Mode Current-Limit Adjustment and Standby Input. The current-limit threshold
1
19
ILIM
voltage is 1/10 the voltage seen at ILIM (V ILIM ) over a 400mV to 1.5V range. If V ILIM
drops below 250mV, the slave controller enters a low-power standby mode, forcing
DL high and DH low.
Trigger Input. Connect to the master controller ’ s low-side gate driver. For the
2
20
TRIG
MAX1887, a rising edge triggers a single cycle. For the MAX1897, the trigger input ’ s
polarity is pin selectable. POL = V CC or floating triggers on the rising edge (out-of-
phase operation), and POL = GND triggers on the falling edge (in-phase operation).
3
4
1
2
CM+
CM-
Master Controller ’ s Positive Current-Sense Input
Master Controller ’ s Negative Current-Sense Input
On-Time Selection Control Input. This is a three-level input used to determine the DH
on time (see On-Time Control and Active Current Balancing ). For the MAX1897,
connect TON as follows for the indicated switching frequencies:
GND = 550kHz
—
3
TON
floating = 300kHz
V CC = 200kHz.
For the MAX1887, the switching frequency is internally configured for 300kHz
operation. The slave controller ’ s switching frequency should be selected to closely
match the frequency of the master PWM controller.
5
6
7
4
5
6
CS-
CS+
COMP
Slave Controller ’ s Negative Current-Sense Input
Slave Controller ’ s Positive Current-Sense Input
Current Balance Compensation. Connect a series resistor and capacitor between
COMP and OUT. See the Current Balance Compensation section.
TRIG Polarity Select Input. Connect POL to V CC or float to trigger on the rising edge of
—
7
POL
TRIG (out-of-phase operation). Connect POL to GND to trigger on the falling edge of TRIG
(in-phase operation). For the MAX1887, POL is internally connected to V CC .
8
9
10
8
9
10
GND
PGND
DL
Analog Ground. Connect the MAX1897 ’ s exposed pad to analog ground.
Power Ground
Low-Side Gate-Driver Output. DL swings from PGND to V DD . DL is forced high
when the MAX1897 enters standby or shutdown mode.
Supply Voltage Input for the DL Gate Driver. For the MAX1887, V DD also serves as
11
11
V DD
the analog supply voltage input that powers the PWM core. Connect to the system
supply voltage (4.5V to 5.5V). Bypass to PGND with a 1μF or greater ceramic
capacitor, as close to the IC as possible.
Analog Supply Voltage Input for PWM Core. Connect V CC to the system supply
—
12
V CC
voltage (4.5V to 5.5V) through a series 10 ? resistor. Bypass to GND with a 0.22μF
or greater ceramic capacitor, as close to the MAX1897 as possible.
—
13
SHDN
Active-Low Shutdown Input. A logic low shuts down the MAX1897 slave controller,
immediately pulling DL high and DH low. Connect to V CC for normal operation.
10
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1897ETP+ | 功能描述:电流型 PWM 控制器 Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1897ETP+T | 功能描述:电流型 PWM 控制器 Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1897ETP-T | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1898EUB41 | 功能描述:电池管理 Linear Charger for 1-Cell Li+ Battery RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1898EUB41+ | 功能描述:电池管理 Linear Charger for 1-Cell Li+ Battery RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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