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Part: LT1617ES5
Category:
Power Management
-> Regulators
-> Switching Regulators
-> Inverting
Description: LT1617, 350mA, Micropower Inverting DC/DC Converters in SOT-23
Company: Linear Technology Corporation
Datasheet: Download LT1617ES5 datasheet File size : 550 kB
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Datasheet text preview:
LT1617/LT1617-1 Micropower Inverting DC/DC Converters in SOT-23
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 Tiny 5-Lead SOT-23 Package
APPLICATIO S
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LCD Bias Handheld Computers Battery Backup Digital Cameras
The LT®1617/LT1617-1 are micropower inverting DC/DC converters in a 5-lead SOT-23 package. The LT1617 is designed for higher power systems with a 350mA current limit and an input voltage range of 1.2V to 15V, whereas the LT1617-1 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 offtime 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 without the use of costly transformers. The LT1617'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.
TYPICAL APPLICATION
1-Cell Li-Ion to 15V Inverting Converter
L1 22µH 5 VIN LT1617 4 C1 4.7µF SHDN GND 2 NFB 3 24.9k C3 0.22µF 1 SW D1 267k C2 4.7µF L2 22µH
80
15V 12mA EFFICIENCY (%)
VIN 2.5V TO 4.2V
75 70 65 60 55
C1: TAIYO YUDEN LMK316BJ475 C2: TAIYO YUDEN EMK316BJ475 C3: TAIYO YUDEN TMK316BJ224 L1, L2: MURATA LQH3C220K34 D1: MOTOROLA MBR0530
1617/-1 TA01
50 0.1
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Efficiency
VIN = 4.2V VIN = 2.5V 1 10 LOAD CURRENT (mA) 30
1617/-1 TA01a
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LT1617/LT1617-1
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW SW 1 GND 2 NFB 3 4 SHDN 5 VIN
VIN, SHDN Voltage ......... 15V SW Voltage ..... 36V NFB Voltage .... 3V Current into NFB 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
ORDER PART NUMBER LT1617ES5 LT1617ES5-1 S5 PART MARKING LTKF LTKA
S5 PACKAGE 5-LEAD PLASTIC SOT-23
TJMAX = 125°C, JA = 256°C/W
Consult factory for Industrial and Military grade parts.
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 < VIN < 12V VNFB = 1.23V CONDITIONS LT1617-1 LT1617 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 µA ns mV mV mA mA µA µA V V µA
30 1 1.255 0.1 2.7 120 350 125 400 3 12 0.25
1.205
1.23 8 0.05
q
1.3
2 400 85 250
ISW = 60mA (LT1617-1) ISW = 300mA (LT1617) LT1617-1 LT1617 VSHDN = 1.2V VSHDN = 5V 0.9 75 300
100 350 2 8
0.01
5
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1617 and LT1617-1 are guaranteed to meet 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. Note 3: Bias current flows out of the NFB pin.
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W
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LT1617/LT1617-1 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)
300 250 200 150
LT1617
VIN = 1.2V
SHUTDOWN PIN CURRENT (µA)
SWITCH CURRENT LIMIT (mA)
450 400 350 300 250 50 VIN = 1.2V VIN = 12V
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. NFB (Pin 3): Feedback Pin. Set the output voltage by selecting values for R1 and R2 (see Figure 1):
R1 = VOUT - 1.23 1.23 + 2 · 10 -6 R2
UW
75
Feedback Pin Voltage and Bias Current
1.25 5
25
Quiescent Current
VFB = 1.23V NOT SWITCHING
1.24 VOLTAGE 1.23
4 BIAS CURRENT (µA)
23
3
21 VIN = 12V 19 VIN = 1.2V 17
1.22 CURRENT 1.21
2
1
1617/-1 G01
1617/-1 G02
1617/-1 G03
Switch Current Limit
VIN = 12V 25
Shutdown Pin Current
20
15 25°C 10 100°C
LT1617-1 100
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
1617/-1 G06
1617/-1 G04
1617/-1 G05
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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.
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