MAX1844ETP+ Maxim Integrated Products, MAX1844ETP+ Datasheet - Page 5

• 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

ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, V
Note 1: When the inductor is in continuous conduction, the output voltage will have a DC regulation level higher than the error com-
Note 2: On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = GND, V
Note 3: Specifications to -40°C are guaranteed by design, not production tested.
Note 4: Production testing limitations due to package handling require relaxed maximum on-resistance specifications for the QFN
Accurate Current Limit for Notebook Computers
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
Overvoltage Trip Threshold
(Fixed-Threshold Mode)
Overvoltage Comparator Offset
(Adjustable-Threshold Mode)
PGOOD Trip Threshold (Lower)
PGOOD Trip Threshold (Upper)
PGOOD Output Low Voltage
PGOOD Leakage Current
Current-Limit Threshold (Fixed)
Current-Limit Threshold
(Adjustable)
V
Lockout Threshold
Logic Input High Voltage
Logic Input Low Voltage
Logic Input Current
CC
Undervoltage
parator threshold by 50% of the ripple. In discontinuous conduction (SKIP = GND, light load), the output voltage will have a
DC regulation level higher than the trip level by approximately 1.5% due to slope compensation.
and a 250pF capacitor connected from DH to LX. Actual in-circuit times may differ due to MOSFET switching speeds.
package. The MAX1844EEP, MAX1844EGP, and MAX1844ETP contain the same die and the QFN package imposes no
additional resistance in-circuit.
PARAMETER
_______________________________________________________________________________________
High-Speed Step-Down Controller with
CC
DD
CC
DD
CC
)
)
)
)
= V
(Note 2)
FB forced above the regulation point
FB forced above the regulation point
Measured at V+
SHDN = GND
SHDN = GND
SHDN = GND, V+ = 28V, V
V
With respect to error comparator threshold, no load
OVP = GND, rising edge, hysteresis = 1%
External feedback, measured at FB with respect to
V
Internal feedback, measured at OUT with respect to the
nominal OUT regulation voltage, 1V < V
With respect to error comparator threshold, no load
OUT falling edge, hysteresis = 1%
With respect to error comparator threshold, no load
OUT rising edge, hysteresis = 1%
I
High state, forced to 5.5V
GND - V
GND - V
GND - V
Rising edge, hysteresis = 20mV,
PWM disabled below this level
LATCH, SHDN, SKIP
LATCH, SHDN, SKIP
LATCH, SHDN, SKIP
SINK
DD
CC
OVP
= 4.5V to 5.5V, no external REF load
= 5V, SKIP = GND, T
, 1V < V
= 1mA
CS
CS
CS
, ILIM = V
, V
, V
OVP
ILIM
ILIM
1.8V, rising edge, hysteresis = 1%
= 0.5V
= 2V
CC
CONDITIONS
A
CC
= -40°C to +85°C, unless otherwise noted.) (Note 3)
= V
DD
= 0 or 5V
OVP
< 1.8V
-12.5
1.98
MIN
-3.5
160
-30
7.5
4.1
2.4
12
85
35
-1
TYP
MAX
+3.5
2.02
12.5
+30
-7.5
500
800
115
240
0.4
4.4
0.8
40
17
65
5
5
5
5
1
1
BST
= 5V,
UNITS
mV
mV
mV
µA
µA
µA
µA
µA
µA
µA
µA
ns
%
%
%
%
V
V
V
V
V
5