参数资料
型号: MAX1845ETX+T
厂商: Maxim Integrated Products
文件页数: 3/27页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 36-TQFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
PWM 型: 电流模式
输出数: 2
频率 - 最大: 540kHz
电源电压: 4.5 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 36-WFQFN 裸露焊盘
包装: 带卷 (TR)
Dual, High-Efficiency, Step-Down
Controller with Accurate Current Limit
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V DD = V CC = 5V, SKIP = AGND, V+ = 15V, T A = 0°C to +85°C , typical values are at +25°C, unless otherwise
noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TON = AGND
120
137
153
On-Time, Side 1 (Note 3)
t ON1
V+ = 24V,
V OUT1 = 2V
TON = REF
TON = float
153
222
174
247
195
272
ns
TON = V CC
TON = AGND
316
160
353
182
390
204
On-Time, Side 2 (Note 3)
t ON2
V+ = 24V,
V OUT2 = 2V
TON = REF
TON = float
205
301
234
336
263
371
ns
TON = V CC
TON = AGND
432
125
483
135
534
145
On-Time Tracking (Note 3)
On-time 2 with
respect to on-
time 1
TON = REF
TON = float
125
125
135
135
145
145
%
TON = V CC
125
135
145
Minimum Off-Time (Note 3)
t OFF
400
500
ns
Quiescent Supply Current (V CC )
Quiescent Supply Current (V DD )
Quiescent Supply Current (V+)
Shutdown Supply Current (V CC )
Shutdown Supply Current (V DD )
Shutdown Supply Current (V+)
I CC
I DD
I+
FB_ forced above the regulation point
FB_ forced above the regulation point
Measured at V+
ON1 = ON2 = AGND, OVP = V CC or AGND
ON1 = ON2 = AGND, V OVP = 1.8V
ON1 = ON2 = AGND
ON1 = ON2 = AGND, measured at V+,
V CC = AGND or 5V
1100
<1
25
<1
1
<1
<1
1500
5
70
5
5
5
5
μA
μA
μA
μA
μA
μA
Reference Voltage
V REF
V CC = 4.5V to 5.5V, no external REF load
1.98
2
2.02
V
Reference Load Regulation
REF Sink Current
REF Fault Lockout Voltage
I REF = 0 to 50μA
REF in regulation
Falling edge, hysteresis = 40mV
10
1.6
0.01
V
μA
V
Overvoltage Trip Threshold
(Fixed-Threshold Mode)
OVP = AGND, with respect to error-
comparator trip threshold
1V < V OVP < 1.8V, external feedback,
measured at FB_ with respect to V OVP
112
-28
114
0
117
28
%
mV
Overvoltage Comparator Offset
(Adjustable-Threshold Mode)
1V < V OVP < 1.8V, internal feedback,
measured at OUT_ with respect to OUT_
-3.5
0
+3.5
%
regulation point
OVP Input Leakage Current
Overvoltage Fault Propagation
Delay
Output Undervoltage Threshold
Output Undervoltage Protection
Blanking Time
1V < V OVP < 1.8V
FB_ forced 2% above trip threshold
UVP = V CC , with respect to error-comparator
trip threshold
From ON_ signal going high
-100
65
10
<1
1.5
70
100
75
30
nA
μs
%
ms
_______________________________________________________________________________________
3
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