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LT1317CMS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
4
LT1317/LT1317B
TYPICAL PERFOR A CE CHARACTERISTICS
UW
INPUT VOLTAGE
0
OSCILLATOR FREQUENCY (kHz)
700
650
600
550
500
2468
1317 TPC01
10 12
25°C
–40°C
85°C
Oscillator Frequency
DUTY CYCLE (%)
0 20406080100
SWITCH CURRENT (mA)
1317 TPC02
800
600
400
200
0
V
IN
= 2V
L = 10µH
Burst Mode Current Limit (LT1317)
Switch Current Limit,
Duty Cycle = 30%
SWITCH CURRENT (A)
0 0.2 0.4 0.6 0.8 1
SWITCH VOLTAGE (V
CESAT
) (mV)
1317 TPC06
700
600
500
400
300
200
100
0
25°C
–40°C
85°C
Switch Voltage Drop (V
CESAT
)
TEMPERATURE (°C)
–50 0 50–25 25 75 100
LBI INPUT BIAS CURRENT (nA)
1317 TPC05
6
5
4
3
2
1
0
LBI Input Bias CurrentSwitch Current Limit
TEMPERATURE (°C)
–50 –25
QUIESCENT CURRENT (µA)
1317 TPC09
110
100
90
80
70
60
50
40
30
0 255075100
Quiescent Current, SHDN = 2V
TEMPERATURE (°C)
–50
FEEDBACK VOLTAGE (V)
1.25
1.24
1.23
1.22
1.21
1.20
–25 0 25 50
1317 TPC07
75 100
Feedback Voltage
TEMPERATURE (°C)
–50
LBI REFERENCE VOLTAGE (mV)
1317 TPC08
203
202
201
200
199
198
197
196
195
–25 0 25 50 75 100
LBI Reference Voltage
TEMPERATURE (°C)
–50
SWITCH CURRENT (mA)
1000
900
800
700
600
500
–25 0 25 50
1317 TPC03
75 100
DUTY CYCLE (%)
0
SWITCH CURRENT (mA)
1200
1000
800
600
400
200
20 40 60 80
1317 TPC04
100
MINIMUM (25°C)
TYPICAL
5
LT1317/LT1317B
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (µA)
26
25
24
23
22
21
20
–25 0 25 50
1317 TPC10
75 100
TEMPERATURE (°C)
–50 –25 0 25 50 75 100
FB PIN BIAS CURRENT (nA)
1317 TPC11
40
36
32
28
24
20
16
12
8
4
0
Quiescent Current, SHDN = 0V FB Pin Bias Current
SHDN Pin Current
LOAD CURRENT (mA)
1
EFFICIENCY (%)
90
80
70
60
50
40
10 100 1000
1317 TPC14
V
IN
= 3V
V
IN
= 2.2V
V
IN
= 1.65V
LOAD CURRENT (mA)
1
EFFICIENCY (%)
90
80
70
60
50
40
10 100 1000
1317 TPC15
V
IN
= 3V
V
IN
= 2.2V
V
IN
= 1.65V
LOAD CURRENT (mA)
EFFICIENCY (%)
90
80
70
60
50
10 100 1000
1317 TPC13
10.3
V
IN
= 3V
V
IN
= 2.2V
V
IN
= 1.65V
5V Output Efficiency, Circuit of
Figure 1 (LT1317)
2-Cell to 3.3V Converter
Efficiency (LT1317B)
2-Cell to 5V Converter Efficiency
(LT1317B)
Burst Mode Operation (LT1317)
V
OUT
50mV/DIV
AC COUPLED
I
L
200mA/DIV
V
SW
5V/DIV
V
IN
= 2V 20µs/DIV 1317 TPC18
V
OUT
= 3.3V
I
LOAD
= 30mA
CIRCUIT OF FIGURE 1
Transient Response (LT1317B)
V
OUT
100mV/DIV
AC COUPLED
I
L
200mA/DIV
V
IN
= 2V 1ms/DIV 1317 TPC17
V
OUT
= 3.3V
CIRCUIT OF FIGURE 1
WITH LT1317B
Transient Response (LT1317)
V
OUT
100mV/DIV
AC COUPLED
I
L
200mA/DIV
V
IN
= 2V 1ms/DIV 1317 TPC16
V
OUT
= 3.3V
CIRCUIT OF FIGURE 1
I
LOAD
165mA
5mA
I
LOAD
165mA
5mA
SHDN PIN VOLTAGE (V)
0
SHDN PIN CURRENT (µA)
3
5
1317 TPC12
12 4
2
1
0
–1
–2
–3
6
6
LT1317/LT1317B
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Load Regulation (LT1317)
V
IN
= 1.5V I
LOAD
25mA/DIV 1317 TPC19
V
OUT
= 5V
V
OUT
50mV/DIV
DC COUPLED
OFFSET
ADDED
Load Regulation (LT1317)
V
IN
= 2V I
LOAD
25mA/DIV 1317 TPC20
V
OUT
= 5V
V
OUT
50mV/DIV
DC COUPLED
OFFSET
ADDED
Load Regulation (LT1317)
V
IN
= 2.5V I
LOAD
50mA/DIV 1317 TPC21
V
OUT
= 5V
V
OUT
50mV/DIV
DC COUPLED
OFFSET
ADDED
Load Regulation (LT1317)
V
IN
= 1.5V I
LOAD
25mA/DIV 1317 TPC22
V
OUT
= 3.3V
Load Regulation (LT1317)
V
IN
= 2V I
LOAD
50mA/DIV 1317 TPC23
V
OUT
= 3.3V
Load Regulation (LT1317)
V
IN
= 2.5V I
LOAD
50mA/DIV 1317 TPC24
V
OUT
= 3.3V
V
OUT
50mV/DIV
DC COUPLED
OFFSET
ADDED
V
OUT
50mV/DIV
DC COUPLED
OFFSET
ADDED
V
OUT
50mV/DIV
DC COUPLED
OFFSET
ADDED
Note: For load regulation pictures, double lines are due to
output capacitor ESR.
V
C
(Pin 1): Compensation Pin for Error Amplifier. Con-
nect a series RC network from this pin to ground. Typical
values for compensation are a 33k/3.3nF combination. A
100pF capacitor from the V
C
pin to ground is optional and
improves noise immunity. Minimize trace area at V
C
.
FB (Pin 2): Feedback Pin. Reference voltage is 1.24V.
Connect resistor divider tap here. Minimize trace area at
FB. Set V
OUT
according to: V
OUT
= 1.24V(1 + R1/R2).
SHDN (Pin 3): Shutdown. Pull this pin low for shutdown
mode (only the low-battery detector remains active).
Leave this pin floating or tie to a voltage between 1.4V and
6V to enable the device. SHDN pin is logic level and need
only meet the logic specification (1.4V for high, 0.4V for
low).
PIN FUNCTIONS
UUU
GND (Pin 4): Ground. Connect directly to local ground
plane.
SW (Pin 5): Switch Pin. Connect inductor/diode here.
Minimize trace area at this pin to keep EMI down.
V
IN
(Pin 6): Supply Pin. Must be bypassed close to the
pin.
LBI (Pin 7):
Low-Battery Detector Input. 200mV refer-
ence. Voltage on LBI must stay between ground and
700mV. Low-battery detector remains active in shutdown
mode.
LBO (Pin 8): Low-Battery Detector Output. Open collec-
tor, can sink 10µA. A 1MΩ pull-up is recommended.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT1317CMS8#PBF

Mfr. #:
Buy LT1317CMS8#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Micropower, 600kHz PWM DC/DC Converters
Lifecycle:
New from this manufacturer.
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