LT1302-5 Linear Technology, LT1302-5 Datasheet - Page 4

• Manufacturer Part Number: LT1302-5
• Description: Micropower High Output Current Step-Up Adjustable and Fixed 5V DC/DC Converters
• Manufacturer: Linear Technology

TYPICAL PERFORMANCE CHARACTERISTICS
PI FU CTIO S
LT1302/LT1302-5
GND (Pin 1): Signal Ground. Feedback resistor and 0.1 F
ceramic bypass capacitor from V
directly to this pin.
V
RC to GND. Keep trace short.
SHDN (Pin 3): Shutdown. Pull high to effect shutdown; tie
to ground for normal operation.
FB/Sense (Pin 4): Feedback/Sense. On the LT1302 this
pin connects to CMP1 input. On the LT1302-5 this pin
connects to the output resistor string.
4
C
100
90
80
70
60
50
U
(Pin 2): Frequency Compensation Pin. Connect series
–50
Maximum Duty Cycle
–25
U
TEMPERATURE ( C)
0
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80
25
U
LT1302-5 Output Voltage vs
Load Current
0
0.1 0.2 0.3 0.4
50
W
V
IN
75
= 2.2V
LOAD CURRENT (A)
1302 G10
IN
U
100
should be connected
0.5 0.6 0.7 0.8 0.9 1.0
V
IN
= 4V
V
IN
300
275
250
225
200
175
150
= 3V
–50
Oscillator Frequency
1302 G13
–25
TEMPERATURE ( C)
0
25
I
to GND forces the LT1302 into current mode at light loads.
Efficiency drops at light load but increases at medium
loads. See Applications Information section.
V
ceramic to GND, and (2) a large value electrolytic to PGND.
When V
10 ) is recommended to isolate the V
supply noise.
T
IN
(Pin 5): Normally left floating. Addition of a 3.3k resistor
(Pin 6): Supply Pin. Must be bypassed with: (1) a 0.1 F
50
20
16
12
* APPROXIMATE
IN
8
4
0
75
Maximum Output Power*
Boost Mode
0
is greater than 5V, a low value resistor (2 to
1302 G11
100
2
INPUT VOLTAGE (V)
4
20
18
16
14
12
10
8
6
4
2
0
Shutdown Pin Bias Current
0
6
T
A
1
= 25 C
SHUTDOWN VOLTAGE (V)
8
2
1302 G14
3
10
IN
4
pin from input
5
6
7
1302 G12
8