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Part: LT1614CMS8
Category:
Power Management
-> Regulators
-> Switching Regulators
-> Inverting
Description: LT1614, 750mA, Inverting 600kHz Switching Regulator
Company: Linear Technology Corporation
Datasheet: Download LT1614CMS8 datasheet File size : 550 kB
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Datasheet text preview:
LT1614 Inverting 600kHz Switching Regulator
FEATURES
s s s s s s s s s
DESCRIPTIO
Better Regulation Than a Charge Pump 0.1 Effective Output Impedance 5V at 200mA from a 5V Input 600kHz Fixed Frequency Operation Operates with VIN as Low as 1V 1mA Quiescent Current Low Shutdown Current: 10µA Low-Battery Detector Low VCESAT Switch: 295mV at 500mA
The LT ®1614 is a fixed frequency, inverting mode switching reglator that operates from an input voltage as low as 1V. Utilizing a low noise topology, the LT1614 can generate a negative output down to 24V from a 1V to 5V input. Fixed frequency switching ensures a clean output free from low frequency noise. The device contains a lowbattery detector with a 200mV reference and shuts down to less than 10µA. No load quiescent current of the LT1614 is 1mA and the internal NPN power switch handles a 500mA current with a voltage drop of just 295mV. High frequency switching enables the use of small inductors and capacitors. Ceramic capacitors can be used in many applications, eliminating the need for bulky tantalum types. The LT1614 is available in 8-lead MSOP or SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s s s s
MR Head Bias LCD Bias GaAs FET Bias Positive-to-Negative Conversion
TYPICAL APPLICATIO
L1 22µH C3 1µF
VIN 5V
L2 22µH VOUT 5V 200mA D1
5V to 5V Converter Efficiency
90
+
VIN C1 33µF 100k 1nF
SW 69.8k
EFFICIENCY (%)
24.9k
C1, C2: AVX TAJB336M010 C3: TAIYO YUDEN EMK316BJ105MF D1: MBR0520 L1, L2: MURATA LQH3C220
Figure 1. 5V to 5V/200mA Converter
+
SHDN LT1614 VC NFB GND
80
C2 33µF
70
60
1614 TA01
50
40 3 100 10 30 LOAD CURRENT (mA) 300
1614 TA02
U
U
U
1
LT1614 ABSOLUTE AXI U RATI GS
VIN, SHDN, LBO Voltage ........ 12V SW Voltage ..... 0.4V to 30V NFB Voltage ... 3V VC Voltage ....... 2V LBI Voltage ........... 0V VLBI 1V Current into FB Pin .... ±1mA Junction Temperature .......... 125°C
PACKAGE/ORDER I FOR ATIO
ORDER PART NUMBER
TOP VIEW NFB VC SHDN GND 1 2 3 4 8 7 6 5 LBO LBI VIN SW TOP VIEW
LT1614CMS8 LT1614IMS8
MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 125°C, JA = 160°C/W
MS8 PART MARKING LTID LTJB
Consult factory for Military grade parts.
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Commercial Grade 0°C to 70°C. VIN = 1.5V, VSHDN = VIN unless otherwise noted.
PARAMETER Quiescent Current VSHDN = 0V Feedback Voltage NFB Pin Bias Current (Note 3) Reference Line Regulation Minimum Input Voltage Maximum Input Voltage Error Amp Transconductance Error Amp Voltage Gain Switching Frequency Maximum Duty Cycle
q q q q
ELECTRICAL CHARACTERISTICS
CONDITIONS
VNFB = 1.24V 1V VIN 2V 2V VIN 6V
I = 5µA 500 73 70 0.75
Switch Current Limit (Note 4)
2
U
U
W
WW
U
W
(Note 1)
Operating Temperature Range LT1614C ....... 0°C to 70°C LT1614I ............ 40°C to 85°C Extended Commercial 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
NFB 1 VC 2 SHDN 3 GND 4 8 7 6 5 LBO LBI VIN SW
LT1614CS8 LT1614IS8
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125°C, JA = 120°C/W
S8 PART MARKING 1614 1614I
MIN
TYP 1 5
MAX 2 10 1.27 7 1.1 0.8 1 6
UNITS mA µA V µA %/V %/V V V µmhos V/V
1.21 2.5
1.24 4.5 0.6 0.3 0.92 16 100 600 80 80 1.2
q
750
kHz % % A
LT1614
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Commercial Grade 0°C to 70°C. VIN = 1.5V, VSHDN = VIN unless otherwise noted.
PARAMETER Switch VCESAT Shutdown Pin Current LBI Threshold Voltage
q
ELECTRICAL CHARACTERISTICS
CONDITIONS ISW = 500mA (25°C, 0°C) ISW = 500mA (70°C) VSHDN = VIN VSHDN = 0V
MIN
TYP 295 10 5
MAX 350 400 20 10 210 215 0.25 0.1 50 3
UNITS mV mV µA µA mV mV V µA nA V/ V µA
190 185
200 0.1 0.01 10 1000 0.01
LBO Output Low LBO Leakage Current LBI Input Bias Current (Note 5) Low-Battery Detector Gain Switch Leakage Current
ISINK = 10µA VLBI = 250mV, VLBO = 5V VLBI = 150mV 1M Load VSW = 5V
Industrial Grade 40°C to 85°C. VIN = 1.5V, VSHDN = VIN unless otherwise noted.
PARAMETER Quiescent Current VSHDN = 0V Feedback Voltage NFB Pin Bias Current (Note 3) Reference Line Regulation Minimum Input Voltage Maximum Input Voltage Error Amp Transconductance Error Amp Voltage Gain Switching Frequency Maximum Duty Cycle Switch Current Limit (Note 4) Switch VCESAT Shutdown Pin Current LBI Threshold Voltage LBO Output Low LBO Leakage Current LBI Input Bias Current (Note 5) Low-Battery Detector Gain Switch Leakage Current ISINK = 10µA VLBI = 250mV, VLBO = 5V VLBI = 150mV 1M Load VSW = 5V ISW = 500mA ( 40°C) ISW = 500mA (85°C) VSHDN = VIN VSHDN = 0V
q q q q
CONDITIONS
MIN
TYP 1 5
MAX 2 10 1.27 7.5 1.1 0.8 1.25 1.0 6
UNITS mA µA V µA %/V %/V V V V µmhos V/V
1.21 2
1.24 4.5 0.6 0.3 1.1 0.8
VNFB = 1.24V 1V VIN 2V 2V VIN 6V 40°C 85°C
q
q
I = 5µA 500 70 0.75
16 100 600 80 1.2 250 330 10 5 180 200 0.1 0.1 5 1000 0.01 3 350 400 20 10 220 0.25 0.3 30 750
kHz % A mV mV µA µA mV V µA nA V/V µA
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1614C is guaranteed to meet specified performance from 0°C to 70°C and is designed, characterized and expected to meet these extended temperature limits, but is not tested at 40°C and 85°C. The LT1614I is guaranteed to meet the extended temperature limits.
Note 3: Bias current flows out of NFB pin. Note 4: Switch current limit guaranteed by design and/or correlation to static tests. Duty cycle affects current limit due to ramp generator. Note 5: Bias current flows out of LBI pin.
3
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