LT1308ACF#TR [Linear]
IC 4.5 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, PDSO14, 4.40 MM, PLASTIC, TSSOP-14, Switching Regulator or Controller;
| 型号： | LT1308ACF#TR |
| 厂家： | 
Linear |
| 描述： | IC 4.5 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, PDSO14, 4.40 MM, PLASTIC, TSSOP-14, Switching Regulator or Controller 转换器 |
| 文件： | 总8页 (文件大小：270K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Final Electrical Specifications
LT1308
Single Cell High Current
Micropower 600kHz
Boost DC/DC Converter
January 1998
U
DESCRIPTION
FEATURES
The LT®1308 is a micropower, fixed frequency boost
DC/DC converter that operates from an input voltage as
low as 1V. Capable of delivering 5V at load current of 1A
from a single Li-Ion cell, the LT1308 also features power
savingBurstModeoperationatlightloads. Highefficiency
is maintained over a broad 1mA to 1A load range.
■
5V at 1A from a Single Li-Ion Cell
■
3.3V at 300mA from a Single NiCd Cell
■
Low Quiescent Current: 100µA
■
Operates with VIN as Low as 1V
■
Fixed Frequency Operation: 600kHz
■
Current Mode PWM Delivers Low Output Ripple
■
Guaranteed Start-Up into Full Load
The device contains a low-battery detector with a 200mV
reference and shuts down to less than 5µA quiescent
current. No-load quiescent current is 100µA and the
internal NPN power switch handles a 2A current with a
voltage drop of just 300mV.
■
Low Shutdown Current: 3µA
■
Low-Battery Comparator
Automatic Burst ModeTM Operation at Light Load
■
■
Low VCESAT
SwitUch: 300mV at 2A
High frequency 600kHz switching allows the use of small,
surface mount components. The LT1308’s current mode
architecture provides fast response to load and line varia-
tions. The device is available in an 8-lead SO package.
APPLICATIONS
■
GSM Terminals
Digital Cameras
Answer-Back Pagers
Cordless Telephones
DECT Phones
GPS Receivers
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
■
■
■
■
Battery Backup Supplies
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TYPICAL APPLICATION
Converter Efficiency
4.2V TO 3V
95
L1
V
= 3.6V
IN
4.7µH
90
85
80
75
70
65
V
SHDN
LBI
IN
V
= 4.2V
IN
SW
R1
301k
LT1308
D1
Li-Ion
CELL
5V
1A
C1
10µF
LBO
FB
V
GND
C
V
= 3V
IN
+
C2
100µF
R2
100k
R
C
47k
C
C
22nF
1308F01
C1: CERAMIC
C2: AVX TPS SERIES
1
10
100
1000
D1: INTERNATIONAL RECTIFIER 10BQ015
L1: COILTRONICS CTX5-1
LOAD CURRENT (mA)
1308 F01a
COILCRAFT DO3316-472
Figure 1. Single Li-Ion Cell to 5V/1A DC/DC Converter
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
1
LT1308
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ABSOLUTE AXI U RATI GS
/
PACKAGE ORDER I FOR ATIO
VIN, SHDN, LBO Voltage ......................................... 10V
SW Voltage ............................................................. 30V
FB Voltage ....................................................... VIN + 1V
VC Voltage ................................................................ 2V
LBI Voltage ............................................ 0V ≤ VLBI ≤ 1V
Current into FB Pin .............................................. ±1mA
Junction Temperature...........................................125°C
Operating Temperature Range
Commercial (Note 1) ......................... –20°C to 70°C
Industrial ........................................... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
TOP VIEW
NUMBER
V
1
2
3
4
8
7
6
5
LBO
LBI
C
LT1308CS8
LT1308IS8
FB
SHDN
GND
V
IN
SW
S8 PART MARKING
S8 PACKAGE
8-LEAD PLASTIC SO
1308
1308I
TJMAX = 125°C, θJA = 80°C/W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
Commercial Grade 0°C to 70°C. VIN = 1.1V, VSHDN = VIN, TA = 25°C, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Quiescent Current
Not Switching
●
●
80
1
160
3
µA
µA
Q
V
= 0V
SHDN
V
Feedback Voltage
●
●
1.20
1.22
27
1.24
80
V
FB
I
FB Pin Bias Current (Note 2)
Reference Line Regulation
V
= V
nA
B
FB
REF
1.1V ≤ V ≤ 2V (25°C, 0°C)
1.1V ≤ V ≤ 2V (70°C)
2V ≤ V ≤ 6V
0.6
1.1
1.5
0.8
%/V
%/V
%/V
IN
IN
●
●
0.3
IN
Minimum Input Voltage
Input Voltage Range
0.92
1
6
V
V
1
g
Error Amp Transconductance
Error Amp Voltage Gain
∆I = 5µA
40
µmhos
m
A
25°C, 0°C
70°C
100
80
V/V
V/V
V
f
Switching Frequency
●
●
●
500
80
600
88
700
95
kHz
%
OSC
Maximum Duty Cycle
Switch Current Limit (Note 3)
DC = 40%
DC = 80%
2.0
1.6
2.5
2
A
A
Switch V
I
I
= 2A (25°C, 0°C)
= 2A (70°C)
300
330
350
400
mV
mV
CESAT
SW
SW
Burst Mode Operation Switch Current Limit
Shutdown Pin Current
L = 3.3µH, V
= 3.3V, V = 1.2V
200
mA
OUT
IN
V
V
V
= 1.1V
= 6V
= 0V
●
2.5
13
–1.5
4.0
26
–2.5
µA
µA
µA
SHDN
SHDN
SHDN
●
●
●
●
●
LBI Threshold Voltage
LBO Output Low
180
200
0.1
0.01
5
220
0.25
0.1
mV
V
I
= 10µA
SINK
LBO Leakage Current
LBI Input Bias Current (Note 4)
V
V
= 250mV, V
= 5V
LBO
µA
nA
LBI
LBI
= 150mV
30
2
LT1308
ELECTRICAL CHARACTERISTICS
Commercial Grade 0°C to 70°C. VIN = 1.1V, VSHDN = VIN, TA = 25°C unless otherwise noted.
SYMBOL PARAMETER
Low-Battery Detector Gain
CONDITIONS
MIN
TYP
MAX
UNITS
1MΩ Load (25°C, 0°C)
1MΩ Load (70°C)
1000
500
3000
V/V
V/V
Switch Leakage Current
Reverse Battery Current
V
= 5V
●
0.01
750
10
µA
SW
(Note 5)
mA
Commercial Grade TA = –20°C, VIN = 1.1V, VSHDN = VIN, unless otherwise noted (Note 1).
SYMBOL PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
I
Quiescent Current
V
V
= 1.3V, Not Switching
80
1
160
3
µA
µA
Q
FB
= 0V
SHDN
V
Feedback Voltage
1.195
1.22
35
1.245
V
µmhos
V/V
FB
g
Error Amp Transconductance
Error Amp Voltage Gain
Switching Frequency
Maximum Duty Cycle
∆I = 5µA
m
A
100
600
88
V
f
500
180
750
350
kHz
OSC
%
Switch V
I
= 2A, V = 1.2V
300
mV
CESAT
SW
IN
Shutdown Pin Current
V
V
= V
= 0V
2.5
–1.5
4.0
–2.5
µA
µA
SHDN
SHDN
IN
LBI Threshold Voltage
200
220
mV
Industrial Grade –40°C to 85°C. VIN = 1.2V, VSHDN = VIN, TA = 25°C, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Quiescent Current
Not Switching
●
●
80
1
160
3
µA
µA
Q
V
SHDN
= 0V
V
Feedback Voltage
●
●
1.195
1.22
27
1.245
80
V
FB
I
FB Pin Bias Current (Note 2)
Reference Line Regulation
V
= V
nA
B
FB
REF
1.1V ≤ V ≤ 2V (–40°C)
1.1V ≤ V ≤ 2V (85°C)
2V ≤ V ≤ 6V
0.6
1.1
1.5
0.8
%/V
%/V
%/V
IN
IN
●
●
0.3
IN
Minimum Input Voltage (–40°C)
Input Voltage Range
1.2
6
V
V
1.2
g
Error Amp Transconductance
Error Amp Voltage Gain
∆I = 5µA
40
µmhos
m
A
–40°C
85°C
100
80
V/V
V/V
V
f
Switching Frequency
V
IN
V
IN
= 1.3V (–40°C)
= 1.3V (85°C)
500
500
600
600
750
750
kHz
kHz
OSC
Maximum Duty Cycle
–40°C
85°C
80
75
88
95
%
%
Switch Current Limit (Note 3)
DC = 40%
DC = 80%
●
2.0
1.6
2.5
2
A
A
Switch V
I
I
= 2A (–40°C)
= 2A (85°C)
300
330
350
400
mV
mV
CESAT
SW
SW
Burst Mode Operation Switch Current Limit
L = 3.3µH, V
= 3.3V
200
mA
OUT
3
LT1308
ELECTRICAL CHARACTERISTICS
Industrial Grade –40°C to 85°C. VIN = 1.2V, VSHDN = VIN, TA = 25°C, unless otherwise noted.
SYMBOL PARAMETER
Shutdown Pin Current
CONDITIONS
MIN
TYP
MAX
UNITS
V
V
V
= 1.2V
= 6V
= 0V
●
●
●
2.5
13
–1.5
4.0
26
–2.5
µA
µA
µA
SHDN
SHDN
SHDN
LBI Threshold Voltage
LBO Output Low
●
●
●
●
180
200
0.1
220
0.25
0.1
mV
V
I
= 10µA
SINK
LBO Leakage Current
V
V
= 250mV, V
= 5V
LBO
0.01
5
µA
nA
LBI
LBI
LBI Input Bias Current (Note 4)
Low-Battery Detector Gain
= 150mV
30
1MΩ Load (–40°C)
1MΩ Load (85°C)
1000
300
3000
V/V
V/V
Switch Leakage Current
V
= 5V
●
0.01
10
µA
SW
The
●
denotes specifications which apply over the full operating
Note 3: Switch current limit guaranteed by design and/or correlation to
static tests. Duty cycle affects current limit due to ramp generator (see
Block Diagram).
Note 4: Bias current flows out of LBI pin.
Note 5: The LT1308 will withstand continuous application of 1.6V applied
temperature range.
Note 1: C grade device specifications are guaranteed over the 0°C to 70°C
temperature range. In addition, C grade device specifications are assured
over the –40°C to 85°C temperature range by design or correlation, but
are not production tested.
to GND pin while V and SW are grounded.
IN
Note 2: Bias current flows into FB pin.
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Saturation Voltage vs
Current
Transient Response
Efficiency
90
85
80
75
70
65
60
55
50
500
400
300
200
100
0
V
V
= 1.2V
IN
OUT
= 3.3V
VOUT
200mV/DIV
R1 = 169k
AC COUPLED
85°C
25°C
100mA
ILOAD
5mA
–40°C
500µs/DIV
1308 G02
VIN = 1.2V
V
OUT = 5V
C2 = 22µF
RC, CC = 47k, 6.8nF
L = 4.7µH
1
10
100
1000
0
0.5
1.0
1.5
2.0
LOAD CURRENT (mA)
SWITCH CURRENT (A)
1308 G01
1308 G03
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PIN FUNCTIONS
VC (Pin 1): Compensation Pin for Error Amplifier. Con-
nect a series RC from this pin to ground. Typical values
are 47kΩ and 22nF. Minimize trace area at VC.
SHDN (Pin 3): Shutdown. Ground this pin to turn off
switcher. MustbetiedtoVIN (orhighervoltage)toenable
switcher. Do not float the SHDN pin.
FB (Pin 2): Feedback Pin. Reference voltage is 1.22V.
Connect resistive divider tap here. Minimize trace area at
FB. Set VOUT according to: VOUT = 1.22V(1 + R1/R2).
GND (Pin 4): Ground. Connect directly to local ground
plane. Ground plane should enclose all components
associated with the LT1308.
4
LT1308
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PIN FUNCTIONS
SW (Pin 5): Switch Pin. Connect inductor/diode here.
Minimize trace area at this pin to keep EMI down.
700mV. Low-battery detector does not function with
SHDN pin grounded. If not used, float LBI pin.
VIN (Pin6):SupplyPin. Musthavelocalbypasscapacitor
LBO (Pin 8): Low-Battery Detector Output. Open collec-
tor, can sink 10µA. A 1MΩ pullup is recommended. LBO
is high impedance when SHDN is grounded.
right at the pin, connected directly to ground.
LBI (Pin 7): Low-Battery Detector Input. 200mV refer-
ence. Voltage on LBI must stay between ground and
W
BLOCK DIAGRAM
V
IN
V
6
IN
R5
40k
R6
40k
SHDN
SHUTDOWN
3
+
V
C
g
1
m
V
OUT
LBI
7
–
+
–
+
–
R1
LBO
8
ERROR
AMPLIFIER
(EXTERNAL)
FB
2
ENABLE
200mV
Q1
Q2
FB
×10
BIAS
A4
A1
R2
R3
30k
(EXTERNAL)
SW
5
COMPARATOR
–
+
DRIVER
R4
140k
FF
RAMP
GENERATOR
Q3
R
Q
+
Σ
S
A2
+
+
A = 3
–
0.03Ω
600kHz
OSCILLATOR
4
1308 BD
GND
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APPLICATIONS INFORMATION
GROUND PLANE
LAYOUT HINTS
1
8
7
6
5
The LT1308 switches current at high speed, mandating
carefulattentiontolayoutforproperperformance.Youwill
not get advertised performance with careless layouts.
Figure 2 shows recommended component placement.
Follow this closely in your PC layout. Note the direct path
oftheswitchingloops. InputcapacitorCIN must beplaced
close (<5mm) to the IC package. As little as 10mm of wire
or PC trace from CIN to VIN will cause problems such as
inability to regulate or oscillation. A 10µF ceramic bypass
capacitor is the only input capacitance required provided
the battery has a low inductance path to the circuit. The
battery itself provides the bulk capacitance the device
requiresforproperoperation.Ifthebatteryislocatedsome
2
3
4
LT1308
V
IN
L
D
C
IN
MULTIPLE
VIAs
C
OUT
GND
V
1308 F02
OUT
Figure 2. Recommended Component Placement. Traces
Carrying High Current Are Direct. Trace Area at FB Pin and VC
Pin is Kept Low. Lead Length to Battery Should Be Kept Short.
Ground Plane Should Be Placed Under All Components
5
LT1308
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APPLICATIONS INFORMATION
distancefromthecircuit, anadditionalinputcapacitormay
berequired. A220µFaluminumelectrolyticunitworkswell
in these cases. This capacitor need not have low ESR.
tive input of the gain stage is tied internally to a 200mV
reference. The positive input is the LBI pin. Arrangement
as a low-battery detector is straightforward. Figure 4
details hookup. R1 and R2 need only be low enough in
value so that the bias current of the LBI pin doesn’t cause
large errors. For R2, 100k is adequate. The 200mV refer-
ence can also be accessed as shown in Figure 5.
OPERATION FROM A LABORATORY POWER SUPPLY
If a lab supply is used, the leads used to connect the circuit
to the supply can have significant inductance at the
LT1308’s switching frequency. As in the previous situa-
tion, an electrolytic capacitor may be required at the circuit
in order to reduce the AC impedance of the input suffi-
ciently. An alternative solution is to attach the circuit
directly to the power supply at the supply terminals,
without the use of leads. The power supply’s output
capacitance will then provide the bulk capacitance the
LT1308 circuit requires.
3.3V
R1
V
IN
LT1308
LBO
1M
LBI
+
–
TO PROCESSOR
R2
100k
200mV
V
LB
– 200mV
2µA
R1 =
INTERNAL
V
BAT
REFERENCE
GND
1308 F04
SHUTDOWN PIN
The LT1308 has a shutdown pin (SHDN) that must be
groundedtoshutthedevicedownortiedtoavoltageequal
or greater than VIN to operate. The shutdown circuit is
shown in Figure 3.
Figure 4. Setting Low-Battery Detector Trip Point
200k
V
Note that allowing SHDN to float turns on both the start-
up current (Q2) and the shutdown current (Q3) for VIN >
2VBE.TheLT1308doesn’tknowwhattodointhissituation
and behaves erratically. SHDN voltage above VIN is al-
lowed. This merely reverse-biases Q3’s base emitter junc-
tion, a benign condition.
IN
2N3906
REF
LBO
LBI
V
BAT
LT1308
V
200mV
+
GND
10k
10µF
1308 F05
Figure 5. Accessing 200mV Reference
V
IN
Q3
R2
400k
SHUTDOWN
CURRENT
GSM PHONES
SHDN
The LT1308 is suitable for converting a single Li-Ion cell
to 5V for powering GSM RF power stages. Figure 6 details
a Li-Ion to 5V converter circuit using frequency compen-
sation optimized for a typical GSM pulsed load. Figure 7
details transient response of Figure 6’s circuit with a
100mA to 1A pulsed load. A slower time sweep is used to
show several transmit pulses in Figure 8. At a VIN of 2.7V,
additional output capacitance is recommended to help
minimize VOUT droop. Figure 9 shows VOUT with an input
voltage of 2.7V. Figure 10 expands the horizontal sweep
speed to 500µs/division to show detail of one transmit
pulse.
400k
START-UP
CURRENT
Q2
Q1
1308 F03
Figure 3. Shutdown Circuit
LOW-BATTERY DETECTOR
The LT1308’s low-battery detector is a simple PNP input
gain stage with an open collector NPN output. The nega-
6
LT1308
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APPLICATIONS INFORMATION
DECT PHONES
VIN = 2.7V
VOUT
200mV/DIV
AC COUPLED
The DECT standard specifies a transmit pulse 416µs in
duration. The LT1308 is capable of delivering a 400mA
pulse load from a 1.2V input with output capacitance of
100µF. Figure 11 depicts VOUT transient response of
Figure 6’s circuit, configured for a 3.3V output by chang-
ing resistor R1 to 169k. Figure 12 shows detail of one
transmit pulse at a higher sweep speed.
1A
100mA
ILOAD
1ms/DIV
1308 F09
Figure 9. GSM Load Transient Response.
At Low VIN, Large Output Capacitor (2200µF)
Serves to Hold up VOUT
L1
4.7µH
V
SHDN
LBI
IN
D1
VOUT
VIN = 2.7V
SW
NiCd
OR
Li-Ion
CELL
MBRS120
200mV/DIV
LT1308
AC COUPLED
R1
5V/1A OR
3.3V/300mA
LBO
FB
V
C
GND
C1
IL, 1A/DIV
10µF
+
C2
100µF
CERAMIC
100k
47k
33nF
1A
ILOAD
100mA
500µs/DIV
1308 F10
L1: TOKO 636CY4R7M
COILTRONICS CTX5-1
1308F06
Figure 10. GSM Load Transient Response.
Faster Sweep Speed (500µs/DIV) Details VOUT
and Inductor Current of One Transmit Pulse
FOR V
FOR V
= 5V: R1 = 309k
OUT
OUT
= 3.3V: R1 = 169k
Figure 6. DC/DC Converter for GSM/DECT Application
VIN = 1.2V
VOUT VIN = 3.6V
200mV/DIV
AC COUPLED
VOUT
200mV/DIV
AC COUPLED
400mA
ILOAD
IL, 1A/DIV
50mA
1A
ILOAD
100mA
2ms/DIV
1308 F11
100µs/DIV
1308 F07
Figure 11. DECT Load Transient Response.
With a Single NiCd Cell the LT1308 Provides 3.3V
with 400mA Pulsed Load. Pulse Width = 416µs
Figure 7. GSM Load Transient Response.
100mA to 1A Transient Response for Figure 6’s Circuit.
Pulse Width = 577µs
VOUT
200mV/DIV
AC COUPLED
V
IN = 1.2V
V
IN = 3.6V
VOUT
200mV/DIV
AC COUPLED
IL, 1A/DIV
1A
ILOAD
400mA
ILOAD
100mA
50mA
1ms/DIV
1308 F08
100µs/DIV
1308 F09
Figure 12. DECT Load Transient Response.
Faster Sweep Speed (100µs/DIV) Details VOUT and
Inductor Current of Single DECT Transmit Pulse
Figure 8. GSM Load Transient Response. Slower
Sweep Speed (1ms/DIV) Shows VOUT over Several
Transmit Pulses
7
LT1308
TYPICAL APPLICATION
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Digital Camera Power Supply
2-4 Cell to 3.3V/175mA, 5V/175mA, 18V/10mA, –10V/10mA
L1A
C6
N = 1
10µF
10µH
2
V
IN
8
1
3
3
1.6V
L1C
N = 0.3
TO 6V
V
SW
IN
L1B
N = 0.7
D1
D2
R3
+
SHDN
C1
100µF
340k
4
LT1308
GND
5V
D3
CCD BIAS
18V
V
C
FB
175mA
3.3V
7
R4
47k
10mA
175mA
C8
1nF
R2
2.08M
+
+
L1D
N = 3.5
+
+
R1
100k
C4
10µF
C3
100µF
C2
100µF
C7
22nF
6
6
C5
10µF
C1, C2, C3 = AVX TPS
C4, C5 = AVX TAJ
C6 = CERAMIC
D1, D2 = IR10BQ015
D3, D4 = BAT-85
L1E
N = 2
L1 = COILTRONICS CTX02-13973
CCD BIAS
–10V
10mA
5
1308 TA01
D4
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PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
(0.254 – 0.508)
7
5
8
6
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
SO8 0695
1
3
4
2
RELATED PARTS
PART NUMBER
LTC®1163
LTC1174
LT1302
DESCRIPTION
COMMENTS
Triple High Side Driver for 2-Cell Inputs
Micropower Step-Down DC/DC Converter
High Output Current Micropower DC/DC Converter
2-Cell Micropower DC/DC Converter
Single Cell Micropower 600kHz PWM DC/DC Converter
1.8V Minimum Input, Drives N-Channel MOSFETs
94% Efficiency, 130µA I , 9V to 5V at 300mA
Q
5V/600mA from 2V, 2A Internal Switch, 200µA I
Q
LT1304
Low-Battery Detector Active in Shutdown, 5V at 200mA for 2 Cells
3.3V at 75mA from 1 Cell, MSOP Package
LT1307
LT1316
Micropower DC/DC Converter with Programmable Peak
Current Limit
Works with High Source Impedance, 1.5V Minimum Input, Low-Battery
Detector Active in Shutdown, 33µA I , MSOP Package
Q
LTC1440/1/2
LTC1516
LT1521
Ultralow Power Single/Dual Comparators with Reference
2-Cell to 5V Regulated Charge Pump
2.8µA I , Adjustable Hysteresis
Q
12µA I , No Inductors, 5V at 50mA from 3V Input
Q
Micropower Low Dropout Linear Regulator
500mV Dropout, 300mA Current, 12µA I
Q
1308i LT/TP 0198 4K • PRINTED IN USA
Linear Technology Corporation
●
1630McCarthyBlvd.,Milpitas, CA95035-7417 (408)432-1900
8
●
●
FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 1998
相关型号：
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IC 4.5 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, PDSO14, 4.40 MM, LEAD FREE, PLASTIC, TSSOP-14, Switching Regulator or Controller
Linear
LT1308ACS8#TR
LT1308A and B - Single Cell High Current Micropower 600kHz Boost DC/DC Converter; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C
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LT1308AIS8#PBF
LT1308A and B - Single Cell High Current Micropower 600kHz Boost DC/DC Converter; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C
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