MAX1945SEUI+T Maxim Integrated Products, MAX1945SEUI+T Datasheet - Page 9

• Manufacturer Part Number: MAX1945SEUI+T
• Description: IC REG STP DWN 6A 28-TSSOP
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX1945SEUI+T

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.8V, 2.5V, Adj
• Current - Output: 6A
• Frequency - Switching: 1MHz
• Voltage - Input: 2.6 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP Exposed Pad, 28-eTSSOP, 28-HTSSOP
• Power - Output: 1.19W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

140
120
100
80
60
40
20
0
(V
6.0
IN
V
V
PGND-MEASURED TEMPERATURE
= V
CC
OUT
= V
= 1.8V
CC
IN
vs. OUTPUT CURRENT
STARTUP WAVEFORMS
6.5
TRANSIENT RESPONSE
= 5V
OUTPUT CURRENT (A)
= 5V, V
V
20µs/div
1ms/div
IN
7.0
OUT
= 5V
AMBIENT TEMP:
+85°C
_______________________________________________________________________________________
1MHz, 1% Accurate, 6A Internal Switch
AMBIENT TEMP:
+25°C
AMBIENT TEMP:
0°C
= 1.8V, I
7.5
MAX1945 toc15
MAX1945 toc12
OUT
8.0
= 6A, f
V
0.5V/div
I
2A/div
V
V
100mV/div
4.5A
I
1A/div
1.5A
IN
OUT
OUT
CTL1, CTL2
OUT
2.030
2.025
2.020
2.015
2.010
2.005
2.000
SW
REFERENCE VOLTAGE vs. TEMPERATURE
-40
= 500kHz, V
Typical Operating Characteristics (continued)
-15
SHUTDOWN WAVEFORMS
TRANSIENT RESPONSE
10
TEMPERATURE (°C)
DD
V
35
IN
40µs/div
20µs/div
= V
= 3.3V
6A RESISTIVE LOAD
60
CC
, and T
V
f
SW
IN
85
Step-Down Regulators
= V
= 500kHz
CC
MAX1945 toc13
MAX1945 toc16
110
= 5V
A
= +25°C, unless otherwise noted.)
135
V
0.5V/div
I
2A/div
V
V
100mV/div
4.5A
I
1A/div
1.5A
OUT
IN
OUT
OUT
CTL1,
,
V
CTL2
12
10
8
6
4
2
0
2.5
OUTPUT SHORT-CIRCUIT CURRENT
3.0
VOLTAGE MARGINING (4%)
SWITCHING WAVEFORM
vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
3.5
V
200µs/div
400ns/div
IN
4.0
= 5V
4.5
f
SW
= 500kHz
5.0
MAX1945 toc17
MAX1945 toc14
5.5
V
2V/div
V
100mV/div
V
5V/div
I
2A/div
V
100mV/div
LX
CTL1
OUT
LX
OUT
9