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LT1573CS8-2.5#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT1573
sn1573 1573fas
Low Dropout
PNP Regulator Driver
Figure 1. 3.3V, 5A Microprocessor Supply
■
Low Cost Solution for High Current, Low Dropout
Regulators
■
Fast Transient Response Needs Much Less
Bulk Capacitance
■
Latching Overload Protection Minimizes
Heat Sink Size
■
Precision Output Voltage (1%)
■
Single Supply Operation: V
IN
= 2.8V to 10V
■
Small Surface Mount Package
■
Capable of Very Low Dropout Voltage (<0.2V)
■
Fixed or Adjustable Outputs
■
Shutdown
■
3.3V to 2.5V Regulators
■
Microprocessor Power Sources
■
Post Regulator for Switching Supplies
■
High Efficiency Linear Regulators
■
Ultralow Dropout Regulators
■
Low Voltage Linear Regulators
The LT
®
1573 is a regulator driver IC designed to provide
a low cost solution for applications requiring high current,
low dropout and fast transient response. When combined
with an external PNP power transistor, this device pro-
vides load current up to 5A with dropout voltages as low
as 0.35V. The LT1573 circuitry is designed for extremely
fast transient response. This greatly reduces bulk storage
capacitance when the regulator is used in applications
with fast, high current load transients.
To keep cost and complexity low, the LT1573 uses a new
time-delayed latching overcurrent protection technique
that requires no external current sense resistor. Base drive
is limited for instantaneous protection, and a time-delayed
latch protects the regulator from continuous short
circuits.
The LT1573 is available as an adjustable regulator with an
output range of 1.27V to 6.8V and with fixed output
voltages of 2.5V, 2.8V and 3.3V. Output accuracy is better
than 1% to meet the critical regulation requirement of fast
microprocessors. A special 8-pin, fused-lead surface mount
package is used to minimize regulator footprint and pro-
vide adequate heat sinking.
, LTC and LT are registered trademarks of Linear Technology Corporation.
COMP
V
OUT
V
IN
DRIVE
FB
LATCH
SHDN
GND
LT1573
+
C
TIME
C
OUT2
220µF
TANT
C
OUT1
1µF
CER
× 24
C
C
100pF
V
IN
5V
R
C
1k
R
D
24Ω
V
OUT
3.3V
GND
1573 F01
R
B
50Ω
R1
1.6k
R2
1k
LOAD
+ +
Q
OUT
MOTOROLA
D45H11
V
OUT
= 1.265V (1 + R1/R2)
FOR T < 45°C, C
OUT1
= 24 × 1µF Y5V CERAMIC SURFACE MOUNT CAPACITORS.
FOR T > 45°C, C
OUT1
= 24 × 1µF X7R CERAMIC SURFACE MOUNT CAPACITORS.
PLACE C
OUT1
IN THE MICROPROCESSOR SOCKET CAVITY
C
IN
100µF
TANT
Transient Response for
0.2A to 5A Output Load Step
10µs/DIV 1573 F01a
50mV/DIV
2.5A/DIV
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LT1573
sn1573 1573fas
ORDER PART
NUMBER
S8 PART MARKING
157333
1573I
1573
157325
157328
Consult factory for Military grade parts.
The ● denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
DRIVE
= 3V, unless otherwise noted.
(Note 1)
Input Pin Voltage (V
IN
to GND) ............................... 10V
Drive Pin Voltage (V
DRIVE
to GND).......................... 10V
Output Pin Voltage (V
OUT
to GND) .......................... 10V
Shutdown Pin Voltage (V
SHDN
to GND) .................. 10V
Operating Junction Temperature Range
LT1573C ............................................... 0°C to 125°C
LT1573I ............................................ –40°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................ 300°C
TOP VIEW
COMP
V
OUT
V
IN
DRIVE
FB
LATCH
SHDN
GND
S8 PACKAGE
8-LEAD PLASTIC SO
1
2
3
4
8
7
6
5
T
JMAX
= 125°C, θ
JA
= 85°C/ W
LT1573CS8
LT1573CS8-2.5
LT1573CS8-2.8
LT1573CS8-3.3
LT1573IS8
PARAMETER CONDITIONS MIN TYP MAX UNITS
DC Characteristics
LT1573 Reference Voltage (Adjustable)(Note 2) I
DRIVE
= 20mA, T
J
= 25°C 1.252 1.265 1.278 V
5mA < I
DRIVE
< 250mA, 3V < V
IN
< 7V, ● 1.225 1.265 1.305 V
1.5V < V
DRIVE
< 7V
LT1573-3.3 Output Voltage (Note 2) I
DRIVE
= 20mA. T
J
= 25°C 3.267 3.3 3.333 V
5mA < I
DRIVE
< 250mA, 3.5V < V
IN
< 7V, ● 3.234 3.3 3.366 V
1.5V < V
DRIVE
< 7V
LT1573-2.8 Output Voltage (Note 2) I
DRIVE
= 20mA, T
J
= 25°C 2.772 2.8 2.828 V
5mA < I
DRIVE
< 250mA, 3V < V
IN
< 7V, ● 2.744 2.8 2.856 V
1.5V < V
DRIVE
< 7V
LT1573-2.5 Output Voltage (Note 2) I
DRIVE
= 20mA, T
J
= 25°C 2.475 2.5 2.525 V
5mA < I
DRIVE
< 250mA, 3V < V
IN
< 7V, ● 2.450 2.5 2.550 V
1.5V < V
DRIVE
< 7V
Line Regulation
LT1573 (V
FB
)I
DRIVE
= 20mA, 3V < V
IN
< 7V ● 0.17 2 mV
LT1573-3.3 (V
OUT
)I
DRIVE
= 20mA, 3.5V < V
IN
< 7V ● 0.34 5 mV
LT1573-2.8 (V
OUT
)I
DRIVE
= 20mA, 3V < V
IN
< 7V ● 0.34 4 mV
LT1573-2.5 (V
OUT
)I
DRIVE
= 20mA, 3V < V
IN
< 7V ● 0.25 4 mV
Load Regulation
LT1573 (V
FB
) ∆I
DRIVE
= 20mA to 250mA ● 730 mV
LT1573-3.3 (V
OUT
) ∆I
DRIVE
= 20mA to 250mA ● 18 40 mV
LT1573-2.8 (V
OUT
) ∆I
DRIVE
= 20mA to 250mA ● 15 34 mV
LT1573-2.5 (V
OUT
) ∆I
DRIVE
= 20mA to 250mA ● 13 30 mV
FB
Pin Bias Current (Adjustable Only) V
FB
= 1.265V ● 0.8 5 µA
DRIVE Pin Current V
FB
= 1.35V, V
DRIVE
= 7V ● 2mA
V
FB
= 1.15V, V
DRIVE
= 1.5V ● 250 440 mA
DRIVE Pin Saturation Voltage I
DRIVE
= 20mA, V
FB
= 1.15V ● 0.12 0.3 V
I
DRIVE
= 250mA, V
FB
= 1.15V ● 0.73 1.4 V
SHDN Pin Threshold Voltage ● 1.0 1.33 1.6 V
SHDN Pin Current V
SHDN
= 5V 200 µA
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
3
LT1573
sn1573 1573fas
PARAMETER CONDITIONS MIN TYP MAX UNITS
LATCH Pin Latch-Off Threshold Voltage ● 0.8 1.4 2.2 V
LATCH Pin Charging Current 7 µA
LATCH Pin Latching Current 0.65 mA
V
IN
– V
OUT
Differential Threshold for Latch Disable ● 0.4 0.7 1.0 V
Input Quiescent Current V
IN
= 7V ● 1.7 3.5 mA
Minimum Input Voltage for Bias Operation ● 2.8 V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Operating conditions are limited by maximum junction
temperature. The regulated feedback or output voltage specification will
not apply for all possible combinations of input voltage, drive voltage and
drive current. When operating at maximum drive current, the drive voltage
range must be limited. When operating at maximum input and drive
voltage, the drive current must be limited.
TEMPERATURE (°C)
–50
FEEDBACK PIN VOLTAGE (V)
1.290
1.285
1.280
1.275
1.270
1.265
1.260
1.255
1.250
1.245
1.240
0
50
75
1573 G01
–25 25
100
125
150
LT1573 Feedback Pin Voltage
vs Temperature
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
3.40
3.38
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
0
50
75
1573 G02
–25
25
100
125
LT1573-3.3V Output Voltage
vs Temperature
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
2.90
2.88
2.86
2.84
2.82
2.80
2.78
2.76
2.74
2.72
2.70
0
50
75
1573 G03
–25
25
100
125
LT1573-2.8V Output Voltage
vs Temperature
TEMPERATURE (°C)
QUIESCENT CURRENT (mA)
1573 G06
3.0
2.5
2.0
1.5
1.0
0.5
0
–50
0
50
75
–25 25
100
125
150
LT1573-2.5V Output Voltage
vs Temperature
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
2.60
2.58
2.56
2.54
2.52
2.50
2.48
2.46
2.44
2.42
2.40
0
50
75
1573 G04
–25
25
100
125
Feedback Pin Bias Current
vs Temperature
Quiescent Current
vs Temperature
TEMPERATURE (°C)
–50
FEEDBACK PIN CURRENT (µA)
2.5
2.0
1.5
1.0
0.5
0
0
50
75
1573 G05
–25 25
100
125
150
The ● denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
DRIVE
= 3V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS
UW
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LT1573CS8-2.5#PBF

Mfr. #:
Buy LT1573CS8-2.5#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LDO Voltage Regulators Low Dropout Reg Driver 2.5V
Lifecycle:
New from this manufacturer.
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