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參數(shù)資料
| 型號： | MAX786 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual-Output Power-Supply Controller for Notebook Computers(具有25μA關(guān)斷的,3.3V/5V筆記本型電腦電源) |
| 中文描述： | 雙輸出電源控制器，用于筆記本電腦 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大小： | 301K |
| 代理商： | MAX786 |
M
Dual-Output Power-S upply
Controller for Notebook Computers
_______________________________________________________________________________________
7
PIN
1
2
3
4
5
6
NAME
CS3
SS3
ON3
D1
D2
VH
FUNCTION
Current-sense input for +3.3V; +100mV = current limit level referenced to FB3.
Soft-start input for +3.3V. Ramp time to full current limit is 1ms/nF of capacitance to GND.
ON/
OFF
control input disables the +3.3V PWM. Tie directly to VL for automatic start-up.
#1 level-translator/comparator noninverting input, threshold = +1.650V. Controls Q1. Tie to GND if unused.
#2 level-translator/comparator noninverting input (see D1)
External positive supply-voltage input for the level translators/comparators
#2 level-translator/comparator output. Sources 20μA from VH when D2 is high. Sinks 500μA to GND
when D2 is low, even with VH = 0V.
#1 level translator/comparator output (see Q2)
Low-current analog ground
3.3V reference output. Sources up to 5mA for external loads. Bypass to GND with 1μF/mA of load or
0.22μF minimum.
Oscillator control/synchronization input. Connect to VL or GND for 200kHz; connect to REF for
300kHz. For external clock synchronization in the 240kHz to 350kHz range, a high-to-low transition
causes a new cycle to start.
Shutdown control input, active low. Tie to VL for automatic start-up. The 5V VL supply stays active in
shutdown, but all other circuitry is disabled. Do not force
SHDN
higher than VL + 0.3V.
ON/
OFF
control input disables the +5V PWM supply. Tie to VL for automatic start-up.
Soft-start control input for +5V. Ramp time to full current limit is 1ms/nF of capacitance to GND.
Current-sense input for +5V; +100mV = current-limit level referenced to FB5.
Gate-drive output for the +5V high-side MOSFET
Inductor connection for the +5V supply
Boost capacitor connection for the +5V supply (0.1μF)
Gate-drive output for the +5V low-side MOSFET
Power ground
Feedback and current-sense input for the +5V PWM
5V logic supply voltage for internal circuitry. VL is always on and can source 5mA for external loads.
Supply voltage input from battery, 5.5V to 30V
Gate-drive output for the +3.3V low-side MOSFET
Boost capacitor connection for the +3.3V supply (0.1μF)
Inductor connection for the +3.3V supply
Gate-drive output for the +3.3V high-side MOSFET
Feedback and current-sense input for the +5V PWM
7
Q2
8
9
Q1
GND
REF
10
11
SYNC
12
SHDN
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
ON5
SS5
CS5
DH5
LX5
BST5
DL5
PGND
FB5
VL
V+
DL3
BST3
LX3
DH3
FB3
_______________________________________________________________________Pin Desc ription
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