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LT1316 Micropower DC/DC Converter with Programmable Peak Current Limit
FEATURES
s s
DESCRIPTION
The LT(R)1316 is a micropower step-up DC/DC converter that operates from an input voltage as low as 1.5V. A programmable input current limiting function allows precise control of peak switch current. Peak switch current can be set to any value between 30mA and 500mA by adjusting one resistor. This is particularly useful for DC/DC converters operating from high source impedance inputs such as lithium coin cells or telephone lines. The fixed off-time, variable on-time regulation scheme results in quiescent current of only 33A in active mode. Quiescent current decreases to 3A in shutdown with the low-battery detector still active. The LT1316 is available in 8-lead MSOP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
s s s s s
Precise Control of Peak Switch Current Quiescent Current: 33A in Active Mode 3A in Shutdown Mode Low-Battery Detector Active in Shutdown Low Switch VCESAT: 300mV at 500mA 8-Lead MSOP and SO Packages Operates with VIN as Low as 1.5V Logic Level Shutdown Pin
APPLICATIONS
s s s
Battery Backup LCD Bias Low Power - 48V to 5V/3.3V Converters
TYPICAL APPLICATION
2-Cell to 5V Step-Up Converter
L1 47H 6 7 VIN SHDN LT1316 NC 2 LBI RSET 3 R5 10k 1% D1: MOTOROLA MBR0520L L1: SUMIDA CD43-470 LBO GND 4 1 NC R2 324k 1% 5 SW FB 8 D1 R1 1M 1% 5V 50mA
90 3.3VIN 2.5VIN
2 CELLS
C1 47F
C2 47F
EFFICIENCY (%)
+
+
80
70
60
1316 TA01
0.1
U
U
U
Efficiency vs Load Current
1.8VIN
1
10
100
1316 TA02
LOAD CURRENT (mA)
1
LT1316
ABSOLUTE MAXIMUM RATINGS
VIN Voltage .............................................................. 12V SW Voltage ............................................... - 0.4V to 30V FB Voltage ..................................................... VIN + 0.3V RSET Voltage ............................................................. 5V SHDN Voltage ............................................................ 6V LBI Voltage ................................................................VIN LBO Voltage ............................................................. 12V Maximum Switch Current ................................... 750mA Maximum Junction Temperature ......................... 125C Operating Temperature Range Commercial ............................................. 0C to 70C Extended Commercial (Note 1) .......... - 40C to 85C Industrial (Note 2) .............................. - 40C to 85C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER INFORMATION
TOP VIEW LBO LBI RSET GND 1 2 3 4 8 7 6 5 FB SHDN VIN SW
ORDER PART NUMBER LT1316CMS8 MS8 PART MARKING LTCD ORDER PART NUMBER
MS8 PACKAGE 8-LEAD PLASTIC MSOP
TJMAX = 125C, JA = 160C/W
TOP VIEW LBO 1 LBI 2 RSET 3 GND 4 8 7 6 5 FB SHDN VIN SW
LT1316CS8 LT1316IS8 S8 PART MARKING 1316 1316I
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125C, JA = 120C/W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
Commercial grade 0C to 70C, Industrial grade - 40C to 85C, VIN = 2V, VSHDN = VIN, TA = 25C unless otherwise noted. (Notes 1, 2)
PARAMETER Minimum Operating Voltage Maximum Operating Voltage Quiescent Current Quiescent Current in Shutdown FB Pin Bias Current Line Regulation LBI Input Threshold LBI Pin Bias Current LBI Input Hysteresis LBO Output Voltage Low LBO Output Leakage Current SHDN Input Voltage High SHDN Input Voltage Low SHDN Pin Bias Current VSHDN = 5V VSHDN = 0V ISINK = 500A LBI = 1.7V, LBO = 5V VIN = 1.8V to 12V Falling Edge VSHDN = 2V, Not Switching
q
CONDITIONS
MIN
TYP 1.5 33
MAX 1.65 12 45 50 5 10 30 0.15 1.25 20 65 0.4 0.1 0.4
UNITS V V A A A A nA %/V V nA mV V A V V A A
VSHDN = 0V, VIN = 2V VSHDN = 0V, VIN = 5V
q q q q q q q q q q q q q
3 7 3 0.04 1.1 1.17 3 35 0.2 0.01 1.4 2 -1
5 -3
2
U
W
U
U
WW
W
LT1316
ELECTRICAL CHARACTERISTICS
Commercial grade 0C to 70C, Industrial grade - 40C to 85C, VIN = 2V, VSHDN = VIN, TA = 25C unless otherwise noted. (Notes 1, 2)
PARAMETER Switch OFF Time CONDITIONS FB > 1V
q
MIN 1.4 1.1 4.4 3.4 74 73
TYP 2.0 3.4 6.3 76 0.30 0.06 0.1
MAX 2.6 3.0 8.2 9.5 90 90 0.4 0.15 5
UNITS s s s s s % % V V A
FB < 1V Switch ON Time Maximum Duty Cycle Switch Saturation Voltage Switch Leakage Current Limit Not Asserted 1V < FB < 1.2V Current Limit Not Asserted 1V < FB < 1.2V ISW = 0.5A ISW = 0.1A Switch Off, VSW = 5V
q q q q q
Commercial grade 0C to 70C, VIN = 2V, VSHDN = VIN, TA = 25C unless otherwise noted.
FB Comparator Trip Point Peak Switch Current RSET = 27.4k, TA = 25C RSET = 27.4k, TA =0C RSET = 27.4k, TA = 70C RSET = 10K RSET = 121k
q q
1.21 90 90 70 250
1.23 100 100 90 290 25
1.25 110 115 110 340
V mA mA mA mA mA
Industrial grade - 40C to 85C, VIN = 2V, VSHDN = VIN, TA = 25C unless otherwise noted.
FB Comparator Trip Point Peak Switch Current RSET = 27.4k, RSET = 10k
q q q
1.205 70 200
1.23 100 290
1.255 125 370
V mA mA
The q denotes specifications which apply over the specified temperature range. Note 1: C grade device specifications are guaranteed over the 0C to 70C temperature range. In addition, C grade device specifications are assured
over the - 40C to 85C temperature range by design or correlation, but are not production tested. Note 2: I grade device specifications are guaranteed over the - 40C to 85C temperature range.
TYPICAL PERFORMANCE CHARACTERISTICS
Load Transient Response
VOUT 100mV/DIV AC COUPLED 50mA ILOAD 0mA
1316 G01
UW
Burst ModeTM Operation
VOUT 100mV/DIV AC COUPLED VSW 5V/DIV INDUCTOR CURRENT 200mA/DIV
1316 G02
Burst Mode IS A TRADEMARK OF LINEAR TECHNOLOGY CORPORATION.
3
LT1316 TYPICAL PERFORMANCE CHARACTERISTICS
Switch Saturation Voltage vs Switch Current
500
SWITCH SATURATION VOLTAGE (mV)
75C 400
300
-40C 200 25C 100
4
OFF-TIME (s) -25 0 25 50 TEMPERATURE (C) 75 100
1316 G04
100C
LBI PIN CURRENT (nA)
0 0 100 200 300 400 500 600 700 800 SWITCH CURRENT (mA)
1316 G03
Maximum On-Time vs Temperature
8 36
QUIESCENT CURRENT (A)
MAXIMUM ON-TIME (s)
7
32
FEEDBACK VOLTAGE (V)
6
5 -50
-25
0 25 50 TEMPERATURE (C)
FB Pin Bias Current vs Temperature
4 SHUTDOWN PIN CURRENT (A) 4
FB PIN BIAS CURRENT (nA)
3
PEAK SWITCH CURRENT (mA)
3
2
1 -50
-25
0 25 50 TEMPERATURE (C)
4
UW
75
1316 G06
LBI Pin Bias Current vs Temperature
8 4
Off-Time vs Temperature
6
3
2
2
1
0 -50
0 -50
-25
0 25 50 TEMPERATURE (C)
75
100
1316 G05
Quiescent Current vs Temperature
1.240
Feedback Voltage vs Temperature
34
1.235
1.230
30
28
1.225
100
26 -50
-25
0 25 50 TEMPERATURE (C)
75
100
1316 G07
1.220 -50
-25
0 25 50 TEMPERATURE (C)
75
100
1316 G08
Shutdown Pin Bias Current vs Shutdown Pin Voltage
1000
Peak Switch Current vs Temperature
RSET = 4.84k RSET = 10k
2
100
RSET = 27.4k
1
RSET = 97.3k
0
-1 75 100
1316 G11
0
1 2 3 4 5 SHUTDOWN PIN VOLTAGE (V)
6
1316 G09
10 -50
-25
0 25 50 TEMPERATURE (C)
75
100
1316 G10
LT1316 PIN FUNCTIONS
LBO (Pin 1): Low-Battery Detector Output. Open collector can sink up to 500A. Low-battery detector remains active in shutdown mode. LBI (Pin 2): Low-Battery Detector Input. When voltage at this pin drops below 1.17V, LBO goes low. RSET (Pin 3): A resistor between RSET and GND programs peak switch current. The resistor value should be between 3k and 150k. Do not float or short to ground. This is a high impedance node. Keep traces at this pin as short as possible. Do not put capacitance at this pin. GND (Pin 4): Ground. Connect directly to ground plane. SW (Pin 5): Collector of NPN Power Transistor. Keep traces at this pin as short as possible. VIN (Pin 6): Input Supply. Must be bypassed close to the pin. SHDN (Pin 7): Shutdown. Ground this pin to place the part in shutdown mode (only the low-battery detector remains active). 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). FB (Pin 8): Feedback Pin. Reference voltage is 1.23V. Connect resistive divider tap here. Minimize trace area at FB. Set VOUT according to: VOUT = 1.23V(1 + R1/R2).
BLOCK DIAGRA
LB0 1 6
LBI 2
+
A3
-
1.17V
1.5V UNDERVOLTAGE LOCKOUT R3 = 10R4 R4 8 FB R2
A1
A2
0.5V
+
A4 DRIVER Q2 x1 Q1 x200 4 RSET R5 GND
OSCILLATOR 6.3s ON 2s OFF
-
3
7
1316 F01
SHDN
Figure 1. LT1316 Block Diagram
-
+
-
+
W
U
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L1 VIN
D1 VOUT C1 R1
VIN
5
SW
VREF 1.23V
5
LT1316
APPLICATIONS INFORMATION
Table 1 simplifies component selection for commonly used input and output voltages. The methods used in determining these values are discussed in more detail later in this data sheet. VOUT can be set using the equation:
VOUT
R2 + R1 VOUT = 1.23 R2
)
)
R1 FB R2
1316 EQF01
Table 1. RSET Resistor and Inductor Values
VIN 2 2 2 2 5 5 5 5 VOUT 5 5 5 5 12 28 28 28 LOAD CURRENT 10mA 25mA 50mA 75mA 100mA 1mA 5mA 10mA RSET RESISTOR 36.8k 18.2k 10k 6.81k 6.81k 75k 22.1k 10k INDUCTOR 100H 68H 47H 33H 82H 100H 100H 100H PEAK SWITCH CURRENT 80mA 165mA 320mA 500mA 490mA 56mA 140mA 270mA
Operation To understand operation of the LT1316, first examine Figure 1. Comparator A1 monitors FB voltage which is VOUT divided down by resistor divider network R1/R2. When voltage at the FB pin drops below the reference voltage (1.23V), A1's output goes high and the oscillator is enabled. The oscillator has an off-time fixed at 2s and an on-time limited to 6.3s. Power transistor Q1 is cycled on and off by the oscillator forcing current through the inductor to alternately ramp up and down (see Figure 2).
VOUT AC COUPLED 200mV/DIV VSW 5V/DIV INDUCTOR CURRENT 100mA/DIV
DC CURRENT LIMIT (mA)
10s/DIV
1316 F02
Figure 2. Switching Waveforms
6
U
W
U
U
During the portion of the switch cycle when Q1 is turned off, current is forced through D1 to C1 causing output voltage to rise. This switching action continues until output voltage rises enough to overcome A1's hysteresis. Peak switch current is set by a resistor from the RSET pin to ground. Voltage at the RSET pin is forced to 0.5V by A4 and is used to set up a constant current through R5. This current also flows through R3 which sets the voltage at the positive input of comparator A2. When Q1 turns on, the SW pin goes low and current ramps up at the rate VIN/L. Current through Q2 is equal to Q1's current divided by 200. When current through Q2 causes the voltage drop across R4 and R3 to be equal, A2 changes state and resets the oscillator, causing Q1 to turn off. Shutdown is accomplished by grounding the SHDN pin. The low-battery detector A3 has its own 1.17V reference and is always on. The open collector output device can sink up to 500A. Approximately 35mV of hysteresis is built into A3 to reduce "buzzing" as the battery voltage reaches the trip level. Current Limit During active mode when the part is switching, current in the inductor ramps up each switch cycle until reaching a preprogrammed current limit. This current limit value must be set by placing the appropriate resistor from the RSET pin to ground. This resistance value can be found by using Figure 3 to locate the desired DC current limit and
1000
100
10 10 RSET (k)
1316 F03
100
Figure 3. DC Current Limit vs RSET Resistor Note: DC Current is the Peak Switch Current if the Power Transistor had Zero Turn-Off Delay
LT1316
APPLICATIONS INFORMATION
then adding in the amount of overshoot that will occur due to turn-off delay of the power transistor. This turn-off delay is approximately 300ns. Peak switch current = DC current limit from graph + VIN/L(turn-off delay) Example: Set peak switch current to 100mA for: VIN = 2V, L = 33H Overshoot = VIN/L(turn-off delay) = (2/33H)(300ns) = 18.2mA Refer to RSET graph and locate (100mA - 18.2mA) 82mA RSET 33k Calculating Duty Cycle For a boost converter running in continuous conduction mode, duty cycle is constrained by VIN and VOUT according to the equation:
DC = VOUT - VIN + VD VOUT - VSAT + VD
where VD = diode voltage drop 0.4V and VSAT = switch saturation voltage 0.2V. If the duty cycle exceeds the LT1316's minimum specified duty cycle of 0.73, the converter cannot operate in continuous conduction mode and must be designed for discontinuous mode operation. Inductor Selection and Peak Current Limit for Continuous Conduction Mode Peak current and inductance determine available output power. Both must be chosen properly. If peak current or inductance is increased, output power increases. Once output power or current and duty cycle are known, peak current can be set by the following equation, assuming continuous mode operation:
MINIMUM INDUCTANCE FOR CONTINOUS MODE OPERATION (H)
IPEAK =
2(IOUT) 1 - DC
Inductance can now be calculated using the peak current:
U
W
U
U
L=
VOUT - VIN + VD (tOFF) 0.4(IPEAK)
(2)
where tOFF = 2s and VD = 0.4V. As a result of equations 1 and 2, ripple current during switching will be 40% of the peak current (see Figure 2). Using these equations at the specified IOUT, the part is delivering approximately 60% of its maximum output power. In other words, the part is operating on a 40% reserve. This is a safe margin to use and can be decreased if input voltage and output current are tightly controlled. For some applications, this recommended inductor size may be too large. Inductance can be reduced but available output power will decrease. Also, ripple current during switching will increase and may cause discontinuous operation. Discontinuous operation occurs when inductor current ramps down to zero at the end of each switch cycle (see Figure 4). Shown in Figure 5 is minimum inductance vs peak current for the part to remain in continuous mode.
0mA INDUCTOR CURRENT 100mA/DIV
SW PIN 5V/DIV
1316 F04
2s/DIV
Figure 4. Discontinuous Mode Operation
1000 5V TO 18V
5V TO 12V
2V TO 5V 100
(1)
10 10
100 PEAK CURRENT (mA)
1000
1316 F05
Figure 5. Minimum Inductance vs Peak Current for Continuous Mode Operation
7
LT1316
APPLICATIONS INFORMATION
Discontinuous Mode Operation A boost converter with a high VOUT:VIN ratio operates with a high duty cycle in continuous mode. For duty cycles exceeding the LT1316's guaranteed minimum specification of 0.73, the circuit will need to be designed for discontinuous operation. Additionally, very low peak current limiting below 50mA may necessitate operating in this mode unless high inductance values are acceptable. When operating in discontinuous mode, a different equation governs available output power. For each switch cycle, the inductor current ramps down to zero, completely releasing the stored energy. Energy stored in the inductor at any time is equal to 1/2 LI2. Because this energy is released each cycle, the equation for maximum power out is: 2. IPEAK = 3. Find L
L=
2(IOUT) 2(10mA) = = 58mA 1 - DC 1 - 0.654
POUT(MAX) = 1/2L(IPEAK2)f 1 Where f = IPEAK(L) +t VIN - VSAT OFF
)
)
When designing for very low peak currents (< 50mA), the inductor size needs to be large enough so that on-time is a least 1s. On-time can be calculated by the equation:
On-Time =
)
IPEAK * L (VIN - VSAT)
)
where VSAT = 0.2V. Also, at these low current levels, current overshoot due to power transistor turn-off delay will be a significant portion of peak current. Increasing inductor size will keep this to a minimum. Design Example 1 Requirements: VIN = 2V, VOUT = 5V and ILOAD = 10mA. 1. Find duty cycle
DC =
)
VOUT - VIN + VD = 5 - 2 + 0.4 = 0.654 VOUT - VSAT + VD 5 - 0.2 + 0.4
))
)
Because duty cycle is less than the LT1316 minimum specification (0.73), the circuit can be designed for continuous operation.
8
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W
U
U
= 5 - 2 + 0.4 2s 0.4(58mA) = 293H
) )
VOUT - VIN + VD tOFF 0.4(IPEAK)
)
)
4. Find RSET resistor
Overshoot = =
)) ))
VIN 300ns L
2 = 1.8mA 330H
Find RSET from Figure 3 for 58mA - 1.8mA = 56.2mA RSET 47k Design Example 2 Requirements: VIN = 3.3V, VOUT = 28V and ILOAD = 5mA. 1. Find duty cycle:
DC =
)
VOUT - VIN + VD = 28 - 3.3 + 0.4 = 0.89 VOUT - VSAT + VD 28 - 0.2 + 0.4
))
)
Because duty cycle exceeds LT1316 minimum specification of 73%, the circuit must be designed for discontinuous operation. 2. Find POUT(MAX) Multiply POUT by 1.4 to give a safe operating margin POUT(MAX) = POUT(1.4) = (5mA)(28V)(1.4) = 0.196W 3. Set the on-time to the data sheet minimum of 3.4s and find L L= = (tON2)(VIN - VSAT)2 2POUT(MAX)(tON + tOFF) (3.4s2)(3.3 - 0.2)2 = 52H 2(0.196W)(3.4s + 2s)
LT1316
APPLICATIONS INFORMATION
4. Find IPEAK for 3.4s on-time t (V - VSAT) 3.4s(3.3 - 0.2) IPEAK = ON IN = L 52H = 0.202A 5. Find RSET resistor For through-hole applications Sanyo OS-CON capacitors offer extremely low ESR in a small package size. If peak switch current is reduced using the RSET pin, capacitor requirements can be eased and smaller, higher ESR units can be used. Ordinary generic capacitors can generally be used when peak switch current is less than 100mA, although output voltage ripple may increase. Diodes Most of the application circuits on this data sheet specify the Motorola MBR0520L surface mount Schottky diode. This 0.5A, low drop diode suits the LT1316 well. In lower current applications, a 1N4148 can be used although efficiency will suffer due to the higher forward drop. This effect is particularly noticeable at low output voltages. For higher output voltage applications, such as LCD bias generators, the extra drop is a small percentage of the output voltage so the efficiency penalty is small. The low cost of the 1N4148 makes it attractive wherever it can be used. In through-hole applications the 1N5818 is the all around best choice. Lowering Output Ripple Voltage To obtain lower output ripple voltage, a small feedforward capacitor of about 50pF to 100pF may be placed from VOUT to FB as detailed in Figure 6. Ripple voltages with and without the added capacitor are pictured in Figures 7 and 8.
Overshoot =
3.3 = 300ns = 19mA 52H
Find RSET from Figure 3 for 0.202A - 19mA = 0.183A RSET 13k These discontinuous mode equations are designed to minimize peak current at the expense of inductor size. If smaller inductors are desired peak current must be increased. Capacitor Selection Low ESR (Equivalent Series Resistance) capacitors should be used at the output of the LT1316 to minimize output ripple voltage. High quality input bypassing is also required. For surface mount applications AVX TPS series tantalum capacitors are recommended. These have been specifically designed for switch mode power supplies and have low ESR along with high surge current ratings.
SHUTDOWN L1 47H
)) ))
VIN 300ns L
2 CELLS
+
47F
Figure 6. 2-Cell to 5V Step-Up Converter with Reduced Output Ripple Voltage
U
W
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D1 R1 1M 1% FB R2 324k 1% GND
VIN SHDN LT1316
SW
C1 100pF
+
VOUT 47F
RSET 10k
1316 F06
9
LT1316
APPLICATIONS INFORMATION
VOUT 100mV/DIV AC COUPLED VOUT 100mV/DIV AC COUPLED
IL 100mA/DIV
100s/DIV
1316 F07
Figure 7. Switching Waveforms for the Circuit Shown in Figure 7 Without C1. The Output Ripple Voltage is Approximately 140mVP-P
Layout/Input Bypassing The LT1316's high speed switching mandates careful attention to PC board layout. Suggested component placement is shown in Figure 9. The input supply must have low impedance at AC and the input capacitor should be placed as indicated in the figure. The value of this capacitor depends on how close the input supply is to the IC. In situations where the input supply is more than a few inches away from the IC, a 47F to 100F solid tantalum bypass capacitor is required. If the input supply is close to the IC, a 1F ceramic capacitor can be used instead. The LT1316 switches current in pulses up to 0.5A, so a low impedance supply must be available. If the power source (for example, a 2 AA cell battery) is within 1 or 2 inches of the IC, the battery itself provides bulk capacitance and the
RSET
Figure 9. Suggested PC Layout
10
+
U
W
U
U
IL 100mA/DIV
50s/DIV
1316 F08
Figure 8. By Adding C1, Output Ripple Voltage is Reduced to Less Than 80mVP-P
1F ceramic capacitor acts to smooth voltage spikes at switch turn-on and turn-off. If the power source is far away from the IC, inductance in the power source leads results in high impedance at high frequency. A local high capacitance bypass is then required to restore low impedance at the IC. Low-Battery Detector The LT1316 contains an independent low-battery detector that remains active when the device is shut down. This detector, actually a hysteretic comparator, has an open collector output that can sink up to 500A. The comparator also operates below the switcher's undervoltage lockout threshold, operating until VIN reaches approximately 1.4V.
1 2 3 4 LT1316
8 7 6 5 L VIN
CIN D COUT
+
GND
1316 F09
VOUT
LT1316
TYPICAL APPLICATIONS N
Nonisolated - 48V to 5V Flyback Converter
D1 1N5817 2 L3 1 D2 1N4148 7 L2 C2 0.022F R1 1.3M Q1 R4 2M C1 0.1F R2 1.30M 1% 7 1 2 SHDN LB0 LBI RSET R3 604k 1% - 48V 3 R5 69.8k 1% GND 4 LT1316 FB 8 6 VIN 5 SW 6 D3 1N4148 VA VOUT 5V 50mA
Q3 2N3904
EFFICIENCY (%)
U
T1 10:1:1 3 L1 4
+ C3
47F
+ C4
47F R7 Q2 MPSA92 432k, 1%
R6 121k 1%
T1 = DALE LPE-4841-A313 (605-665-9301) L PRI: 2mH R DS(ON): 4.3 AT VGS = 2.5V R6, Q2,R7 MUST BE PLACED NEXT TO THE FB PIN IIN = 190A WHEN VIN = 48V, ILOAD = 1mA
1316 * TA03
Efficiency vs Load Current
90
80 36VIN 70 48VIN 72VIN
60
50
40 1 10 LOAD CURRENT (mA) 100
1316 TA04
11
LT1316
TYPICAL APPLICATIONS N
Positive-to-Negative Converter for LCD Bias
SHUTDOWN VIN 6 VIN 7 SHDN LT1316 5 SW FB 8 L1 33H D1 MMBD914 C2 0.01F 50V C3 100pF 50V R1 3.3M 2.2M R2 210k CONTRAST ADJUST
+
2 CELLS
C1 33F 10V RSET 3
C4: SPRAGUE 293D105X9035B2T C5: SPRAGUE 293D225X0035B2T L1: SUMIDA CD43-330
VIN 470k 1 LBO LT1316 7 SHDN RSET 3 20k
1316 TA08
+
2 CELLS
C1 47F 16V
C1: AVX TPS 47F, 16V C2: SANYO 50MV470GX L1: SUMIDA CD43-470
CAP SHUTDOWN GOOD
When Solenoid Is Energized (VENERGIZE High) Peak Input Current Remains Low and Controlled, Maximizing Battery Life
VENERGIZE 5V/DIV IL1 200mA/DIV VCAP 10V/DIV CAP GOOD 5V/DIV 500ms/DIV
1316 TA09
12
U
+
GND 4 R3 15k
C4 1F 35V D2 MMBD914
+
C5 2.2F 35V
C6 0.33F 50V
D3 MBR0530L
VOUT -20V 6mA
1316 TA06
Battery-Powered Solenoid Driver
L1 47H BAT-85 VCAP ZTX949 47k 6.8M 2 5k FB GND 4 8 324K 1N4148
6 VIN
5 SW LBI
+
C2 470F 50V
1.3k SOLENOID 50k
2N3904
VENERGIZE
LT1316
TYPICAL APPLICATIONS N
Super Cap Backup Supply
R1 10k READY 1M D1 0.5A 5 SW
+
CSUP + 0.1F 5.5V 75
RUN CIN, COUT: TAJB330M010R CSUP: PANASONIC EEC-S5R5V104
+VIN 25V TO 50V
0.022F 100V CERAMIC
0.1F 1.30M 1% 2N3904 604k 1%
U
L1 47H 6 VIN
CONNECT TO MAIN SUPPLY 5V 6mA
1.00M 1 LBO CIN 33F 10V 2 357k 7 LBI SHDN RSET 3 RSET 33k LT1316 FB GND 4 8 324k 1.00M 100pF
+
COUT 33F 10V
1316 TA10
D1: MBR0520LT3 L1: SUMIDA CD43-470
50V to 6V Isolated Flyback Converter
T1 LPRI: 2mH 1N5817 10:1:1 3 2
+ +
C1 100F 16V VOUT 6V/20mA 75% EFFICIENCY
4
1 7
-
1N4148
510k Q1 1N4148 2M 6 VIN SHDN LB0 LBI RSET 3 69.8k 1% GND 4 LT1316 FB 8 12.7k 5 SW 50k 6
7 1 2
1F 16V CERAMIC
C1 = SANYO OS-CON 100F, 16V Q1 = ZETEX ZVN 4424A T1 = DALE LPE-4841-A313 (605-665-9301)
1316 TA11
13
LT1316
TYPICAL APPLICATIONS N
LCD Bias Generator with Output Disconnect in Shutdown
VBAT 1.6V TO 3.5V OPTIONAL CONNECTION L1 22H VIN 3.3V 6 150k
+
C1 22F 6.3V 7
SHUTDOWN
C1: AVX TAJA226M006R C2: AVX TAJB335M035R L1: MURATA LQH3C220K04 Q1: MMBT3906LT3
Universal Serial Bus (USB) to 5V/100mA DC/DC Converter
RB 100 L1 33H 6 VIN SHDN LT1316 3 RSET GND R3 10k 4 FB 8 R1 324k 5 SW
VIN 4V TO 7V 7
+
C1 10F 10V
C1: 10F 10V AVX TAJB106M010 C2: 33F 10V AVX TPSC336M010 C3: 10F ALUMINUM ELECTROLYTIC D1: MBR0520LT1 L1: 33H SUMIDA CD43 (OR COILCRAFT DO1608) Q1: MPS1907A
14
U
MBR0540LT1 100pF 50V CERAMIC Q1
VIN
5 SW FB LT1316 8
3.32M 1%
VOUT 17.1V TO 19.8V 4mA
SHDN RSET 3 11k 1% GND 4 4.7M
232k 1%
+
C2 3.3F 35V
0.33F 50V CERAMIC
1316 TA12
VADJ (VOUT ADJUST) 0V TO 3.3V
D1 Q1
VOUT 5V 100mA
+
C2 33F 10V
100pF
R2 1.00M
+
C3 10F 10V
1316 TA13
LT1316
PACKAGE DESCRIPTION
0.007 (0.18) 0.021 0.006 (0.53 0.015)
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
0.016 - 0.050 0.406 - 1.270 *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
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 representation that the interconnection of circuits as described herein will not infringe on existing patent rights.
U
Dimensions in inches (millimeter) unless otherwise noted. MS8 Package 8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.118 0.004* (3.00 0.102) 8 76 5
0.192 0.004 (4.88 0.10)
0.118 0.004** (3.00 0.102)
1 0.040 0.006 (1.02 0.15) 0 - 6 TYP SEATING PLANE 0.012 (0.30) 0.0256 REF (0.65) TYP
23
4 0.034 0.004 (0.86 0.102)
0.006 0.004 (0.15 0.102)
MSOP (MS8) 1197
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 8 7 6 5
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1
2
3
4
0.053 - 0.069 (1.346 - 1.752)
0.004 - 0.010 (0.101 - 0.254)
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) TYP
SO8 0996
15
LT1316
TYPICAL APPLICATIONS N
Low Profile 2 Cell-to-28V Converter for LCD Bias
VIN 6 VIN SHDN LBI LBO RSET 3 10k
1316 TA05
SHUTDOWN 2 CELLS C1 10F
C1: MURATA GRM235Y5V106Z010 C2: SPRAGUE 293D105X9035B2T C3: 0.33F CERAMIC, 50V C4: 100pF CERAMIC, 50V D1: BAT-54 L1: MURATA LQH3C220K04
VIN 3.3V TO 4.2V
+
7 C1 22F 16V
C1: AVX TAJB226M016R C2, C3: AVX TAJA105K035R C4: AVX TAJB335M035R L1: MURATA LQH3C470
RELATED PARTS
PART NUMBER LTC 1163 LTC1174 LT1302 LT1304 LT1307 LTC1440/1/2 LTC1516 LT1521
(R)
DESCRIPTION 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
Ultralow Power Single/Dual Comparators with Reference 2.8A IQ, Adjustable Hysteresis 2-Cell to 5V Regulated Charge Pump 12A IQ, No Inductors, 5V at 50mA from 3V Input Micropower Low Dropout Linear Regulator 500mV Dropout, 300mA Current, 12A IQ
16
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 q (408) 432-1900 FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com
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L1 22H
D1
VOUT 28V 5mA C4 100pF 50V C3 0.33F 50V C2 1F 35V
5 SW 4.32M LT1316 FB 8 204k GND 4
7 1 2
+
Bipolar LCD Bias Supply
L1 47H 6 VIN 5 SW 100pF SHDN LT1316 FB 8 1N914 C2 1F 35V 1.00M 2N3904 13V 0.5mA
+
22k
10k
+
RSET 3 47k
GND 4
C3 1F 35V
88.7k
+
C4 3.3F 35V
-15V 1.5mA
BAT54 x2
(BAT54 = TWO DIODES IN SOT23)
1316 TA14
COMMENTS 1.8V Minimum Input, Drives N-Channel MOSFETs 94% Efficiency, 130A IQ, 9V to 5V at 300mA 5V/600mA from 2V, 2A Internal Switch, 200A IQ Low-Battery Detector Active in Shutdown, 5V at 200mA for 2 Cells 3.3V at 75mA from 1 Cell
1316f LT/TP 0298 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1997

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