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MAX1845ETX Datasheet(PDF) 5 Page - Maxim Integrated Products

Part # MAX1845ETX
Description  Dual, High-Efficiency, Step-Down Controller with Accurate Current Limit
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1845ETX Datasheet(HTML) 5 Page - Maxim Integrated Products

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Dual, High-Efficiency, Step-Down
Controller with Accurate Current Limit
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, VDD = VCC = 5V, SKIP = AGND, V+ = 15V, TA = -40°C to +85°C, unless otherwise noted.) (Note 5)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
PWM CONTROLLERS
V+
Battery voltage, V+
2
28
Input Voltage Range
VCC/VDD
VCC, VDD
4.5
5.5
V
FB1 to AGND
1.773
1.827
FB1 to VCC
1.477
1.523
DC Output Voltage, OUT1 (Note 2)
VOUT1
V+ = 2V to 28V, SKIP = VCC,
ILOAD = 0 to 10A
FB1 to OUT1
0.985
1.015
V
FB2 to AGND
2.463
2.537
DC Output Voltage, OUT2 (Note 2)
VOUT2
V+ = 2V to 28V, SKIP = VCC,
ILOAD = 0 to 10A
FB2 to OUT2
0.985
1.015
V
Output Voltage Adjust Range
OUT1, OUT2
1
5.5
V
Dual-Mode Threshold (Low)
OVP, FB_
0.05
0.15
V
OVP, ILIM_
VCC -
1.5
VCC -
0.4
Dual-Mode Threshold (High)
FB_
1.9
2.1
V
ROUT1
VOUT1 = 1.5V
75
OUT_ Input Resistance
ROUT2
VOUT2 = 2.5V
100
k
FB_ Input Bias Current
IFB
-0.1
0.1
µA
TON = AGND
120
153
TON = REF
153
195
TON = float
217
272
On-Time, Side 1 (Note 3)
tON1
V+ = 24V, VOUT1 = 2V
TON = VCC
308
390
ns
TON = AGND
160
204
TON = REF
205
263
TON = float
295
371
On-Time, Side 2 (Note 3)
tON2
V+ = 24V, VOUT2 = 2V
TON = VCC
422
534
ns
TON = AGND
125
145
TON = REF
125
145
TON = float
125
145
On-Time Tracking (Note 3)
On-time 2, with
respect to on-time 1
TON = VCC
125
145
%
Minimum Off-Time (Note 3)
tOFF
500
ns
Quiescent Supply Current (VCC)ICC
FB forced above the regulation point
1500
µA
Quiescent Supply Current (VDD)IDD
FB forced above the regulation point
5
µA
Quiescent Supply Current (V+)
I+
Measured at V+
70
µA
Reference Voltage
VREF
VCC = 4.5V to 5.5V, no external REF load
1.98
2.02
V
Reference Load Regulation
IREF = 0 to 50uA
0.01
V
Overvoltage Trip Threshold
(Fixed-Threshold Mode)
OVP = GND, with respect to FB_ regulation
point, no load
112
117
%
Output Undervoltage Threshold
UVP = VCC, with respect to FB_ regulation
point, no load
65
75
%
Current-Limit Threshold (Fixed)
AGND - VCS_, ILIM_ = VCC
35
65
mV


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