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Part: LT1615ES5-1
Category:
Power Management
-> Regulators
-> Switching Regulators
Description: LT1615, Micropower Step-up DC/DC Converter in SOT-23
Company: Linear Technology Corporation
Datasheet: Download LT1615ES5-1 datasheet File size : 550 kB
Request For quote: Find where to buy LT1615ES5-1
Datasheet text preview:
LT1615/LT1615-1 Micropower Step-Up DC/DC Converters in ThinSOT
FEATURES
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DESCRIPTIO
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Low Quiescent Current: 20µA in Active Mode <1µA in Shutdown Mode Operates with VIN as Low as 1V Low VCESAT Switch: 250mV at 300mA Uses Small Surface Mount Components High Output Voltage: Up to 34V Low Profile (1mm) ThinSOTTM Package
APPLICATIO S
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LCD Bias Handheld Computers Battery Backup Digital Cameras
The LT®1615/LT1615-1 are micropower step-up DC/DC converters in a 5-lead low profile (1mm) ThinSOT package. The LT1615 is designed for higher power systems with a 350mA current limit and an input voltage range of 1.2V to 15V, whereas the LT1615-1 is intended for lower power and single-cell applications with a 100mA current limit and an extended input voltage range of 1V to 15V. Otherwise, the two devices are functionally equivalent. Both devices feature a quiescent current of only 20µA at no load, which further reduces to 0.5µA in shutdown. A current limited, fixed off-time control scheme conserves operating current, resulting in high efficiency over a broad range of load current. The 36V switch allows high voltage outputs up to 34V to be easily generated in a simple boost topology without the use of costly transformers. The LT1615's low off-time of 400ns permits the use of tiny, low profile inductors and capacitors to minimize footprint and cost in space-conscious portable applications.
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
L1 10µH
1-Cell Li-Ion to 20V Converter for LCD Bias
85
D1 20V 12mA SW LT1615 SHDN C1 4.7µF GND FB R2 130k
1615/-1 TA01
VIN 2.5V TO 4.2V VIN
80 VIN = 4.2V 75
EFFICIENCY (%)
R1 2M C2 1µF
70 65 60 55 50 0.1
C1: TAIYO YUDEN LMK316BJ475 C2: TAIYO YUDEN TMK316BJ105 D1: MOTOROLA MBR0530 L1: MURATA LQH3C100K24
0.3
U
Efficiency
VIN = 2.5V VIN = 3.3V 1 3 10 LOAD CURRENT (mA) 30
1615/-1 TA01a
U
U
1
LT1615/LT1615-1
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
ORDER PART NUMBER
TOP VIEW SW 1 GND 2 FB 3 4 SHDN 5 VIN
VIN, SHDN Voltage ......... 15V SW Voltage ..... 36V FB Voltage ........ VIN Current into FB Pin ....... 1mA Junction Temperature .......... 125°C Operating Temperature Range (Note 2) .. 40°C to 85°C Storage Temperature Range ........ 65°C to 150°C Lead Temperature (Soldering, 10 sec)......... 300°C
LT1615ES5 LT1615ES5-1 LT1615IS5 S5 PART MARKING LTIZ LTKH LTXZ
S5 PACKAGE 5-LEAD PLASTIC SOT-23
TJMAX = 125°C, JA = 256°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER Minimum Input Voltage Quiescent Current FB Comparator Trip Point FB Comparator Hysteresis Output Voltage Line Regulation FB Pin Bias Current (Note 3) Switch Off Time Switch VCESAT Switch Current Limit SHDN Pin Current SHDN Input Voltage High SHDN Input Voltage Low Switch Leakage Current Switch Off, VSW = 5V 1.2V 1V VFB < 0.6V CONDITIONS LT1615-1 LT1615 Not Switching VSHDN = 0V
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 1.2V, VSHDN = 1.2V unless otherwise noted.
MIN TYP MAX 1.0 1.2 20
q
UNITS V V µA µA V mV %/V nA ns µs
30 1 1.255 0.1 80
1.205
1.23 8 0.05
q
30 400 1.5 85 250 75 300 100 350 2 8 0.9
ISW = 70mA (LT1615-1) ISW = 300mA (LT1615) LT1615-1 LT1615 VSHDN = 1.2V VSHDN = 5V
120 350 125 400 3 12 0.25
0.01
5
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1615E and LT1615E-1 are guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the 40°C to 85°C operating temperature range are assured by design,
characterization and correlation with statistical process controls. The LT1615I is guaranteed to meet performance specifications over the 40°C to 85°C operating temperature range. Note 3: Bias current flows into the FB pin.
2
U
mV mV mA mA µA µA V V µA
W
U
U
WW
W
LT1615/LT1615-1 TYPICAL PERFOR A CE CHARACTERISTICS
Switch Saturation Voltage (VCESAT)
0.60 0.55 QUIESCENT CURRENT (µA) 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 50 25 0 25 50 TEMPERATURE (°C) 75 100 1.20 50 25 0 25 50 TEMPERATURE (°C) 75 0 100
15 50 25 0 25 50 TEMPERATURE (°C) 75 100
FEEDBACK VOLTAGE (V) SWITCH VOLTAGE (V)
ISWITCH = 500mA
ISWITCH = 300mA
Switch Off Time
550 500 400 350
SWITCH OFF TIME (ns)
450 400 350 300 250 50 VIN = 1.2V VIN = 12V
PEAK CURRENT (mA)
300 250 200 150
LT1615
VIN = 1.2V
SHUTDOWN PIN CURRENT (µA)
25
0 25 50 TEMPERATURE (°C)
PI FU CTIO S
SW (Pin 1): Switch Pin. This is the collector of the internal NPN power switch. Minimize the metal trace area connected to this pin to minimize EMI. GND (Pin 2): Ground. Tie this pin directly to the local ground plane. FB (Pin 3): Feedback Pin. Set the output voltage by selecting values for R1 and R2 (see Figure 1): SHDN (Pin 4): Shutdown Pin. Tie this pin to 0.9V or higher to enable the device. Tie below 0.25V to turn off the device. VIN (Pin 5): Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible.
V R1 = R2 OUT - 1 1.23
UW
75
Feedback Pin Voltage and Bias Current
1.25 50
25
Quiescent Current
VFB = 1.23V NOT SWITCHING
1.24 VOLTAGE 1.23
40
BIAS CURRENT (nA)
23
30
21 VIN = 12V 19 VIN = 1.2V 17
1.22
CURRENT
20
1.21
10
1615/-1 G01
1615/-1 G02
1615/-1 G03
Switch Current Limit
VIN = 12V 25
Shutdown Pin Current
20
15 25°C 10 100°C
LT1615-1 100
VIN = 12V VIN = 1.2V
5
50 100 0 50 0 25 0 25 50 TEMPERATURE (°C) 75 100 0 5 10 SHUTDOWN PIN VOLTAGE (V) 15
1615/-1 G03
1615/-1 G04
1615/-1 G05
U
U
U
3
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