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參數(shù)資料
| 型號： | MAX1887 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quick-PWM Slave Controllers for Multiphase, Step-Down |
| 中文描述： | Quick-PWM從控制器，用于多相、降壓型電源 |
| 文件頁數(shù)： | 10/33頁 |
| 文件大小： | 1018K |
| 代理商： | MAX1887 |
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M
Quick-PWM Slave Controllers for
Multiphase, Step-Down Supplies
10
______________________________________________________________________________________
Pin Description
PIN
MAX1887
MAX1897
NAME
DESCRIPTION
1
19
ILIM
Dual-Mode Current-Limit Adjustment and Standby Input. The current-limit threshold
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.
2
20
TRIG
Trigger Input. Connect to the master controller
’
s low-side gate driver. For the
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
1
CM+
Master Controller
’
s Positive Current-Sense Input
4
2
CM-
Master Controller
’
s Negative Current-Sense Input
—
3
TON
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
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
4
CS-
Slave Controller
’
s Negative Current-Sense Input
6
5
CS+
Slave Controller
’
s Positive Current-Sense Input
7
6
COMP
Current Balance Compensation. Connect a series resistor and capacitor between
COMP and OUT. See the
Current Balance Compensation
section.
TRIG P ol ar y S el ect Inp ut. C onnect P OL to V
C C
or fl oat to tr g g er on the r si ng ed g e of
TRIG ( out- of- p hase op er ati on) C onnect P OL to GN D to tr g g er on the fal ng ed g e of TRIG
( n- p hase op er ati on) For the M AX 1887, P OL i s i nter nal y connected to V
C C
.
—
7
POL
8
8
GND
Analog Ground. Connect the MAX1897
’
s exposed pad to analog ground.
9
9
PGND
Power Ground
10
10
DL
Low-Side Gate-Driver Output. DL swings from PGND to V
DD
. DL is forced high
when the MAX1897 enters standby or shutdown mode.
11
11
V
DD
Supply Voltage Input for the DL Gate Driver. For the MAX1887, V
DD
also serves as
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
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.
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.
—
12
V
CC
—
13
SHDN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1887EEE | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX1887EEE+ | 功能描述:電流型 PWM 控制器 CDMA Cellular/PCS System Power Supplies RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX1887EEE+T | 功能描述:電流型 PWM 控制器 CDMA Cellular/PCS System Power Supplies RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX1887EEE-T | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX1888EUA | 功能描述:其他電源管理 RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
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