參數(shù)資料
型號(hào)： DS21Q48N
廠商： DALLAS SEMICONDUCTOR
元件分類： Digital Transmission Interface
英文描述： DATACOM, PCM TRANSCEIVER, PBGA144
封裝： BGA-144
文件頁(yè)數(shù)： 7/16頁(yè)
文件大小： 296K
代理商： DS21Q48N
MAX863
Dual, High-Efficiency, PFM, Step-Up
DC-DC Controller
______________________________________________________________________________________
15
MAX863
EXT2
CS2
VOUT2 = 12V
FLYBACK OR SEPIC
OUTPUT
VOUT1 = 3.3V, 600mA
VIN = 2.0V TO 11V OR VOUT2
N1B
IRF7301
C7
0.1
F
R4
115k
1%
C6
10pF
C2
1
F
C5
100
F
20V
≤0.1
R2
50m
R3
1M
1%
N1A
R1
50m
R5
R6
R7
100k
C1
330
F
10V
≤0.1
D1
MBRS340T3
T1
10
H, 2.5A
CTX10-4
D2
MBRS340T3
L2
10
H
2A
C3
100
F
10V
≤0.1
C4
100
F
10V
≤0.1
C9
10
F
ON/OFF
FB2
SHDN1
EXT1
D3
CMPSH-3C
CS1
LBI
LOW-BATTERY
DETECTOR OUTPUT
LBO
SENSE1 FB1
PGND
BOOT
VDD
GND
SHDN2
REF
C8
82pF
Figure 9. 3-Cell to 3.3V Step-Up/Step-Down Logic Supply with 12V for Flash Memory or Analog Functions
__________Applications Information
Low-Input-Voltage Operation
When the voltage at VDD falls and EXT1 or EXT2
approaches the MOSFET gate-to-source threshold volt-
age, the MOSFET may operate in its linear region and
dissipate excessive power. Prolonged operation in this
mode may damage the MOSFET if power dissipation
ratings are inadequate. This effect is more significant in
non-bootstrapped mode, but can occur in boot-
strapped mode if the input voltage drops so low that it
cannot support the load and causes the output voltage
to collapse. To avoid this condition, use logic-level or
low-threshold MOSFETs.
Starting Up Under Load
The Typical Operating Characteristics show the
Bootstrapped-Mode Minimum Start-Up Input Voltage
vs. Output Current graph. The MAX863 is not intended
to start up under full load in bootstrapped mode with
low input voltages.
________________Application Circuits
Bootstrapped 5V Logic and
24V LCD Bias Supply
The circuit in Figure 8 operates from two AA or AAA
cells, and generates 5V (up to 750mA) for logic and
24V (up to 35mA) for an LCD bias supply. OUT1 is
used to bootstrap the MAX863 for better MOSFET gate
drive. VOUT1 can be set to 3.3V if low threshold
MOSFETs are used.
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