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Part: LT1616ES6
Category:
Power Management
-> Regulators
-> Switching Regulators
-> Step-Down
Description: LT1616, 1.4MHz, 600mA Step-down Switching Regulator in SOT-23
Company: Linear Technology Corporation
Datasheet: Download LT1616ES6 datasheet File size : 550 kB
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Datasheet text preview:
LT1616 600mA, 1.4MHz Step-Down Switching Regulator in SOT-23
FEATURES
s s s s s s s s s
DESCRIPTIO
Wide Input Range: 3.6V to 25V 5V at 400mA from 7V to 25V Input 3.3V at 400mA from 4.7V to 25V Input Fixed Frequency 1.4MHz Operation Uses Tiny Capacitors and Inductors Internally Compensated Low Shutdown Current: <1µA Low VCESAT Switch: 220mV at 300mA Tiny 6-Lead SOT-23 Package
APPLICATIO S
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The LT ®1616 is a current mode PWM step-down DC/DC converter with internal 0.6A power switch, packaged in a tiny 6-lead SOT-23. The wide input range of 3.6V to 25V makes the LT1616 suitable for regulating a wide variety of power sources, from 4-cell batteries and 5V logic rails to unregulated wall transformers and lead-acid batteries. Its high operating frequency allows the use of tiny, low cost inductors and ceramic capacitors. With its internal compensation eliminating additional components, a complete 400mA step-down regulator fits onto 0.15 square inches of PC board area. The constant frequency current mode PWM architecture and stable operation with ceramic capacitors results in low, predictable output ripple. Current limiting provides protection against shorted outputs. The low current (<1µA) shutdown provides complete output disconnect, enabling easy power management in battery-powered systems.
, LTC and LT are registered trademarks of Linear Technology Corporation.
s s s
Wall Transformer Regulation Local Logic Supply Conversion: 12V to 5V 12V or 5V to 3.3V, 2.5V or 1.8V Distributed Supply Regulation Digital Cameras Battery-Powered Equipment
TYPICAL APPLICATIO
3.3V Step-Down Converter
VIN 4.5V TO 25V 5 VIN BOOST LT1616 OFF ON 4 SHDN GND 2 C1 1µF SW FB 3 R2 10k 6 R1 16.5k 1 D2 C3 0.01µF L1 10µH
100 90
EFFICIENCY (%)
D1
VOUT 3.3V 300mA: VIN = 4.5V TO 25V 400mA: VIN = 4.7V TO 25V C2 10µF
1616 TA01
C1: TAIYO-YUDEN TMK316BJ105 C2: TAIYO-YUDEN JMK316BJ106ML D1: ON SEMICONDUCTOR MBR0530 D2: 1N4148 L1: SUMIDA CR43-100
U
Efficiency
VIN = 5V VIN = 12V 80 70 60 50 40 30 0 100 200 300 400 LOAD CURRENT (mA) 500
1616 G02
U
U
VIN = 20V
1
LT1616
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
ORDER PART NUMBER
TOP VIEW BOOST 1 GND 2 FB 3 6 SW 5 VIN 4 SHDN
Input Voltage (VIN) ....... 25V BOOST Pin Voltage ....... 35V BOOST Pin Above SW Pin ..... 25V SHDN Pin ...... 25V FB Voltage ....... 6V Current Into FB Pin ..... ± 1mA Operating Temperature Range (Note 2) .. 40°C to 85°C Maximum Junction Temperature .. 125°C Storage Temperature Range ........ 65°C to 150°C Lead Temperature (Soldering, 10 sec)......... 300°C
LT1616ES6
S6 PACKAGE 6-LEAD PLASTIC SOT-23
S6 PART MARKING LTNB
TJMAX = 125°C, JA = 250°C/ W
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VBOOST = 15V, unless otherwise noted. (Note 2)
PARAMETER Undervoltage Lockout Feedback Voltage FB Pin Bias Current Quiescent Current Quiescent Current in Shutdown Reference Line Regulation Switching Frequency Frequency Shift Threshold on FB Pin Maximum Duty Cycle Switch Current Limit Switch VCESAT Switch Leakage Current Minimum Boost Voltage Above Switch BOOST Pin Current SHDN Input Voltage High SHDN Input Voltage Low SHDN Bias Current VSHDN = 3V VSHDN = 0V 8 0.01 ISW = 300mA ISW = 300mA 1.8 0.4 15 0.1 1.6 7 (Note 3) ISW = 300mA VFB = Measured VREF + 10mV Not Switching VSHDN = 0V VIN = 5V to 25V VFB = 1.1V fSW = 700kHz
q q q q
CONDITIONS
MIN 1.225
TYP 3.35 1.25 150 1.9 0.01 0.005
MAX 3.6 1.275 600 2.5 2 1.8
UNITS V V nA mA µA %/V MHz V % mA
1 80 630
1.4 0.44 87 850 220
350 10 2.5 12
Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: The LT1616E is 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.
Note 3: Current limit guaranteed by design and/or correlation to static test. Slope compensation reduces current limit at higher duty cycle.
2
U
mV µA V mA V V µA µA
W
U
U
WW
W
LT1616 TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency, VOUT = 5V
100 90 80
EFFICIENCY (%)
VIN = 8V VIN = 12V
EFFICIENCY (%)
80 70 60 50 40 30 VIN = 20V
SWITCH VOLTAGE (mV)
70 60 50 40 30 0 100
VIN = 24V
300 400 LOAD CURRENT (mA)
200
Maximum Load Current at VOUT = 5V
500 L = 15µH 400 400 500
BOOST PIN CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
L = 10µH L = 6.8µH
300 OUTPUT LIMITED BY DISSIPATION 200
100
0
5
15 10 INPUT VOLTAGE (V)
Switch Current Limit
1000
1.27
SWITCH CURRENT LIMIT (mA)
TYPICAL 600 MINIMUM 400
FEEDBACK PIN VOLTAGE (V)
800
1.26
UNDERVOLTAGE LOCKOUT (V)
200
0
0
20
60 40 DUTY CYCLE (%)
UW
1616 G01
Efficiency, VOUT = 3.3V
100 90 VIN = 5V VIN = 12V
500
Switch Voltage Drop
400
300
200
100
0 0 100 300 400 LOAD CURRENT (mA) 200 500
1616 G02
500
0
200 400 SWITCH CURRENT (mA)
600
1616 G03
Maximum Load Current at VOUT = 3.3V
16 L = 10µH 14 12 10 8 6 4 2 100 20 25
1616 G04
BOOST Pin Current
L = 4.7µH OUTPUT LIMITED BY DISSIPATION
300
200
0
5
15 10 INPUT VOLTAGE (V)
20
25
1616 G05
0
0
200
400
600
1616 G06
SWITCH CURRENT (mA)
Feedback Pin Voltage
3.7 3.6 3.5 3.4 3.3 3.2
Undervoltage Lockout
1.25
1.24
1.23
80
100
1616 G07
1.22 50
25
0 25 50 TEMPERATURE (°C)
75
100
1616 G08
3.1 50
25
0 25 50 TEMPERATURE (°C)
75
100
1616 G11
3
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