參數(shù)資料
型號： MAX1854
廠商： Maxim Integrated Products, Inc.
英文描述： High-Speed, Adjustable, Synchronous Step-Down Controllers with Integrated Voltage Positioning
中文描述： 高速、數(shù)字可調(diào)、同步降壓型控制器，集成電壓定位電路
文件頁數(shù)： 2/33頁
文件大小： 840K
代理商： MAX1854
M
High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
V+ to GND..............................................................-0.3V to +30V
V
CC
, V
DD
to GND .....................................................-0.3V to +6V
PGND to GND.....................................................................±0.3V
SHDN
, VGATE to GND.............................................-0.3V to +6V
ILIM, FB, CC, REF, D0
–
D4, VPS,
TON to GND...........................................-0.3V to (V
CC
+ 0.3V)
SKIP
to GND (Note 1).................................-0.3V to (V
CC
+ 0.3V)
DL to PGND................................................-0.3V to (V
DD
+ 0.3V)
BST to GND............................................................-0.3V to +36V
DH to LX....................................................-0.3V to (V
BST
+ 0.3V)
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = +15V, V
CC
= V
DD
= 5V,
SKIP
= V
CC
, VPS = PGND,
T
A
= 0°C to +85°C
, unless otherwise noted. Typical
values are at T
A
= +25
°
C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1:
SKIP
may be forced below -0.3V, temporarily exceeding the absolute maximum rating, for the purpose of debugging proto-
type breadboards, using the no-fault test mode. Limit the current drawn to -2mA (max).
LX to BST..................................................................-6V to +0.3V
CS to GND.................................................................-2V to +30V
REF Short Circuit to GND...........................................Continuous
Continuous Power Dissipation (T
A
= +70
°
C)
24-Pin QSOP (derate 9.5mW/
°
C above +70
°
C)...........762mW
Operating Temperature Range ...........................-40
°
C to +85
°
C
Junction Temperature......................................................+150
°
C
Storage Temperature Range.............................-65
°
C to +150
°
C
Lead Temperature (soldering, 10s).................................+300
°
C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
PWM CONTROLLER
Battery voltage, V+
V
CC
, V
DD
2
28
5.5
Input Voltage Range
4.5
V
DAC codes from
1.35V to 2.0V
-1
1
DAC codes from
0.925V to 1.3V
-1.2
1.2
DC Output Voltage Accuracy
(Notes 2, 3)
V+ = 4.5V to 28V,
VPS = PGND
DAC codes from
0.6V to 0.9V
-1.5
1.5
%
FB Input Bias Current
VPS Input Bias Current
VPS Gain
CS Input Bias Current
ILIM Input Leakage Current
Soft-Start Ramp Time
I
FB
I
VPS
A
VPS
I
CS
I
ILIM
FB = 0.6V to 2.0V
V
VPS
=
±
40mV
V
VPS
= 0 or -40mV, gain from VPS to FB
0 to 28V
V
ILIM
= 0 or 5.0V
0 to full ILIM
-0.2
-1
0.153
-1
0.2
1
0.197
1
100
μ
A
μ
A
%/mV
μ
A
nA
ms
0.175
0.01
1.7
255
327
470
678
400
TON = GND
TON = REF
TON = open
TON = V
CC
205
280
425
615
300
375
520
740
500
On-Time (Note 4)
t
ON
V+ = 11.0V,
V
FB
= 1.5V
ns
Minimum Off-Time (Note 4)
t
OFF( M N)
ns
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