MAX1844ETP+ Maxim Integrated Products, MAX1844ETP+ Datasheet - Page 7

• 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

(Circuit of Figure 1, V
10
Accurate Current Limit for Notebook Computers
8
6
4
2
0
0
vs. INPUT VOLTAGE (PWM MODE)
LOAD-TRANSIENT RESPONSE
NO-LOAD SUPPLY CURRENT
5
I
I
I
IN
DD
CC
STARTUP WAVEFORM
INPUT VOLTAGE (V)
10
(SKIP MODE)
500µs/div
20µs/div
15
_______________________________________________________________________________________
IN
= 15V, SKIP = GND, TON = unconnected, T
20
High-Speed Step-Down Controller with
MAX1844 toc12B
MAX1844 toc14
25
30
V
AC COUPLED
100mV/div
INDUCTOR
CURRENT
2A/div
DL
5V/div
V
1V/div
INDUCTOR
CURRENT
5A/div
DL
5V/div
SHDN
5V/div
OUT
OUT
0.8
0.6
0.4
0.2
0
0
Typical Operating Characteristics (continued)
vs. INPUT VOLTAGE (SKIP MODE)
OUTPUT OVERLOAD WAVEFORM
NO-LOAD SUPPLY CURRENT
5
I
SHUTDOWN WAVEFORM
I
IN
CC
INPUT VOLTAGE (V)
10
(UVP = GND)
(OVP = GND)
100µs/div
40µs/div
15
A
R
= +25°C, unless otherwise noted.)
20
LOAD
R
I
LOAD
DD
MAX1844 toc13A
= 112mΩ
MAX1844 toc15A
= 1Ω
25
30
V
1V/div
INDUCTOR
CURRENT
5A/div
DL
5V/div
V
1V/div
INDUCTOR
CURRENT
5A/div
DL
5V/div
OUT
OUT
OUTPUT OVERLOAD WAVEFORM
LOAD-TRANSIENT RESPONSE
(UVP = V
SHUTDOWN WAVEFORM
(PWM MODE)
(OVP = V
100µs/div
CC
40µs/div
20µs/div
, OVP = GND)
CC
R
LOAD
)
R
LOAD
= 112mΩ
MAX1844 toc13B
MAX1844 toc15B
MAX1844 toc12A
= 1Ω
V
1V/div
INDUCTOR
CURRENT
5A/div
DL
5V/div
V
1V/div
INDUCTOR
CURRENT
5A/div
DL
5V/div
V
AC COUPLED
100mV/div
INDUCTOR
CURRENT
2A/div
DL
5V/div
OUT
OUT
OUT
7