MAX1844ETP+ Maxim Integrated Products, MAX1844ETP+ Datasheet - Page 2

• Manufacturer Part Number: MAX1844ETP+
• Description: IC CNTRLR STP DWN HS 20-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX1844ETP+

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.8V, 2.5V, Adj
• Current - Output: 4A
• Frequency - Switching: 200kHz, 300kHz, 450kHz, 600kHz
• Voltage - Input: 2 ~ 28 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-TQFN Exposed Pad
• Power - Output: 727mW
• Output Voltage: 1 V to 5.5 V, 1.8 V, 2.5 V
• Output Current: 4000 mA
• Mounting Style: SMD/SMT
• Switching Frequency: 600 KHz
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Synchronous Pin: No
• Topology: Buck
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +28V
V
OUT, PGOOD, SHDN to GND ..................................-0.3V to +6V
FB, ILIM, LATCH, OVP, REF, SKIP,
BST to GND ............................................................-0.3V to +34V
CS to GND.................................................................-6V to +30V
DL to GND ..................................................-0.3V to (V
DH to LX .....................................................-0.3V to (BST + 0.3V)
LX to BST..................................................................-6V to +0.3V
High-Speed Step-Down Controller with
Accurate Current Limit for Notebook Computers
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.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = 15V, V
T
2
Input Voltage Range
Error Comparator Threshold
(DC Output Voltage Accuracy)
(Note 1)
Load Regulation Error
Line Regulation Error
FB Input Bias Current
Output Adjustment Range
OUT Input Resistance
Soft-Start Ramp Time
On-Time
Minimum Off-Time
Quiescent Supply Current (V
Quiescent Supply Current (V
Quiescent Supply Current (V+)
Shutdown Supply Current (V
Shutdown Supply Current (V
Shutdown Supply Current (V+)
Reference Voltage
Reference Load Regulation
CC
A
TON, UVP to GND ..................................-0.3V to (V
= +25°C.)
, V
_______________________________________________________________________________________
DD
to GND .....................................................-0.3V to +6V
PARAMETER
CC
DD
CC
DD
)
)
)
)
CC
Battery voltage, V+
V
V+ = 4.5V to 28V,
SKIP = V
I
V
FB = GND
FB = V
Rising edge of SHDN to full current limit
V+ = 24V,
V
(Note 2)
(Note 2)
FB forced above the regulation point
FB forced above the regulation point
SHDN = GND
SHDN = GND
SHDN = GND, V+ = 28V, V
V
I
= V
LOAD
REF
CC
CC
OUT
CC
DD
, V
= 4.5V to 5.5V, V+ = 4.5V to 28V
= 4.5V to 5.5V, no external REF load
= 0 to 50µA
= 2V
= 0 to 3A, SKIP = V
CC
DD
= 5V, SKIP = GND, T
CC
or adjustable feedback mode
CC
DD
+ 0.3V)
+ 0.3V)
CONDITIONS
TON = GND (600kHz)
TON = REF (450kHz)
TON = unconnected (300kHz)
TON = V
CC
CC
CC
A
= V
= 0°C to +85°C, unless otherwise noted. Typical values are at
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (T
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
(200kHz)
DD
20-Pin QSOP (derate 9.1mW/°C above +70°C)...........727mW
20-Pin 5mm
above +70°C).................................................................1.60W
= 0 or 5V
FB = OUT
FB = GND
FB = V
✕
5mm QFN (derate 20.0mW/°C
CC
2.475
1.782
0.99
1.98
MIN
-0.1
140
175
260
380
4.5
90
70
2
1
A
= +70°C)
TYP
2.00
190
145
160
200
290
425
400
550
2.5
1.8
1.7
<1
25
<1
<1
<1
9
5
2.525
1.818
MAX
+0.1
1.01
2.02
0.01
350
270
180
225
320
470
500
800
5.5
5.5
28
40
5
5
5
5
UNITS
mV
mV
ms
µA
kΩ
µA
µA
µA
µA
µA
µA
ns
ns
V
V
V
V
V