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LTC1438CG-ADJ Datasheet Download

Part No.:
LTC1438CG-ADJ
Download:
Download Datasheet
Description:
[Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators]
File Size:
599 K
Page:
32 Pages
Logo:
Manufacturer:
LINER [ LINEAR TECHNOLOGY ]
PCB Prototype
 LTC1438CG-ADJ Datasheet Page:2LTC1438CG-ADJ Datasheet Page:3LTC1438CG-ADJ Datasheet Page:4LTC1438CG-ADJ Datasheet Page:5LTC1438CG-ADJ Datasheet Page:7LTC1438CG-ADJ Datasheet Page:8LTC1438CG-ADJ Datasheet Page:9LTC1438CG-ADJ Datasheet Page:10 
LTC1438/LTC1439
TYPICAL PERFORMANCE CHARACTERISTICS
Normalized Oscillator Frequency
vs Temperature
10
4
RUN/SS CURRENT (µA)
5
FREQUENCY (%)
SFB CURRENT (µA)
f
O
–5
–10
– 40 –15
60
35
85
10
TEMPERATURE (°C)
Maximum Current Sense
Threshold Voltage vs Temperature
154
CURRENT SENSE THRESHOLD (mV)
152
V
OUT
50mV/DIV
150
V
OUT
50mV/DIV
148
I
LOAD
= 50mA to 1A
146
– 40 –15
1438 G14
85
10
35
60
TEMPERATURE (°C)
Burst Mode Operation
AUXILIARY OUTPUT VOLTAGE (V)
V
OUT
20mV/DIV
V
ITH
200mV/DIV
I
LOAD
= 50mA
6
U W
110
1438 G10
RUN/SS Pin Current
vs Temperature
0
– 0.25
3
–1.50
– 0.75
–1.00
–1.25
0
– 40 –15
SFB1 Pin Current vs Temperature
2
1
135
85
10
35
60
TEMPERATURE (°C)
110
135
–1.50
– 40 –15
60
35
85
10
TEMPERATURE (°C)
110
135
1438 G11
1438 G12
Transient Response
Transient Response
I
LOAD
= 1A to 3A
1438 G15
110
135
1438 G13
Soft Start: Load Current vs Time
12.2
Auxiliary Regulator Load
Regulation
EXTERNAL PNP: 2N2907A
RUN/SS
5V/DIV
INDUCTOR
CURRENT
1A/DIV
12.1
12.0
11.9
1438 G16
1438 G17
11.8
11.7
0
40
120
160
80
AUXILIARY LOAD CURRENT (mA)
200
1438 G18