LT1073_1 Datasheet, PDF (2/16 Pages) Linear Technology – Micropower DC/DC Converter Adjustable and Fixed 5V, 12V

LT1073
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage, Step-Up Mode ................................ 15V
Supply Voltage, Step-Down Mode ........................... 36V
SW1 Pin Voltage ...................................................... 50V
SW2 Pin Voltage ........................................... –0.4 to V_IN
Feedback Pin Voltage (LT1073) ................................. 5V
Switch Current ........................................................ 1.5A
Maximum Power Dissipation ............................. 500mW
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
I_LIM 1
V_IN 2
SW1 3
SW2 4
8 FB (SENSE)*
7 SET
6 A0
5 GND
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSIONS
T_JMAX = 125°C, θ_JA = 100°C/W (N8)
T_JMAX = 125°C, θ_JA = 120°C/W (S8)
LT1073CN8
LT1073CN8-5
LT1073CN8-12
LT1073CS8
LT1073CS8-5
LT1073CS8-12
S8 PART MARKING
1073
10735
107312
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 1.5V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
I_Q
Quiescent Current
Switch Off
q
95
130
µA
I_Q
Quiescent Current, Step-Up
No Load
LT1073-5
Mode Configuration
LT1073-12
135
µA
250
µA
V_IN
Input Voltage
Step-Up Mode
q 1.15
1.0
12.6
V
12.6
V
Step-Down Mode
q
30
V
Comparator Trip Point Voltage
LT1073 (Note 2)
q 202 212 222
mV
V_OUT
Output Sense Voltage
LT1073-5 (Note 3)
LT1073-12 (Note 3)
q 4.75
5
5.25
V
q 11.4
12
12.6
V
Comparator Hysteresis
LT1073
q
5
10
mV
Output Hysteresis
LT1073-5
LT1073-12
q
125 250
mV
q
300 600
mV
f_OSC
DC
t_ON
I_FB
I_SET
V_AO
V_CESAT
Oscillator Frequency
Duty Cycle
Switch ON Time
Feedback Pin Bias Current
Set Pin Bias Current
AO Output Low
Reference Line Regulation
Switch Saturation Voltage
Set-Up Mode
Full Load (V_FB = V_REF)
LT1073, V_FB = 0V
V_SET = V_REF
I_AO = –100µA
1V ≤ V_IN ≤ 1.5V
1.5V ≤ V_IN ≤ 12V
V_IN = 1.5V, I_SW = 400mA
q 15
19
23
kHz
q 65
72
80
%
q 30
38
50
µs
q
10
50
nA
q
60
120
nA
q
0.15
0.4
V
q
0.35
1.0
%V
q
0.05
0.1
%V
300 400
mV
q
600
mV
V_IN = 1.5V, I_SW = 500mA
400 550
mV
q
750
mV
V_IN = 5V, I_SW = 1A
700 1000
mV
q
1500
mV
A_V
A2 Error Amp Gain
R_L = 100kΩ (Note 4)
q 400 1000
V/V
2