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LT3028IDHC#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT3028
3028f
Dual 100mA/500mA
Low Dropout, Low Noise,
Micropower Regulators with
Independent Inputs
■
Low Noise: 20µV
RMS
(10Hz to 100kHz)
■
Low Quiescent Current: 30µA/Output
■
Independent Inputs
■
Wide Input Voltage Range: 1.8V to 20V
■
Output Current: 100mA/500mA
■
Very Low Shutdown Current: <0.1
µ
A
■
Low Dropout Voltage: 300mV/320mV at
100mA/500mA
■
Adjustable Outputs from 1.22V to 20V
■
Stable with as Low as 1µF/3.3µF Output Capacitor
■
Stable with Aluminum, Tantalum or
Ceramic Capacitors
■
Reverse-Battery Protected
■
No Protection Diodes Needed
■
Overcurrent and Overtemperature Protected
■
Tracking/Sequencing Capability
■
Thermally Enhanced 16-Lead TSSOP and 16-Lead
(5mm × 3mm) DFN Packages
The LT
®
3028 is a dual, micropower, low noise, low drop-
out regulator with independent inputs. With an external
0.01µF bypass capacitor, output noise is a low 20µV
RMS
over a 10Hz to 100kHz bandwidth. Designed for use in
battery-powered systems, the low 30µA quiescent current
per output makes it an ideal choice. In shutdown, quies-
cent current drops to less than 0.1µA. Shutdown control
is independent for each output, allowing for flexibility in
power management. The device is capable of operating
over an input voltage range of 1.8V to 20V. Output 1 can
supply 500mA of output current with a dropout voltage of
320mV. The device can supply 100mA of output current
from Output 2 with a dropout voltage of 300mV. Quiescent
current is well controlled in dropout.
The LT3028 regulator is stable with output capacitors as
low as 1µF for the 100mA output and 3.3µF for the 500mA
output. Small ceramic capacitors can be used without the
series resistance required by other regulators.
Internal protection circuitry includes reverse-battery pro-
tection, current limiting and thermal limiting protection.
The device is available as an adjustable device with a 1.22V
reference voltage. The LT3028 regulator is available in the
thermally enhanced 16-lead TSSOP and 16-lead, low
profile (5mm × 3mm × 0.75mm) DFN packages.
10Hz to 100kHz Output Noise
3.3V/2.5V Low Noise Regulators
■
Cellular Phones
■
Pagers
■
Battery-Powered Systems
■
Frequency Synthesizers
■
Wireless Modems
■
Tracking/Sequencing Power Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
V
OUT
100µV/DIV
20µV
RMS
3028 TA01b
3.3V AT 500mA
20µV
RMS
NOISE
249k
0.01µF 10µF
422k
3028 TA01a
OUT2
2.5V AT 100mA
20µV
RMS
NOISE
ADJ2
BYP2
GND
249k
0.01µF 10µF
261k
OUT1
ADJ1
BYP1
LT3028
IN1
V
IN1
3.7V TO
20V
1µF
SHDN1
IN2
V
IN2
2.9V TO
20V
1µF
SHDN2
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
Protected by U.S. Patents including 6118263, 6144250.
2
LT3028
3028f
T
JMAX
= 125°C, θ
JA
= 40°C/ W, θ
JC
= 10°C/ W
EXPOSED PAD (PIN 17) IS GND
MUST BE SOLDERED TO PCB
16
15
14
13
12
11
10
9
17
1
2
3
4
5
6
7
8
ADJ1
SHDN1
IN1
IN1
IN2
IN2
SHDN2
ADJ2
BYP1
NC
OUT1
OUT1
GND
OUT2
OUT2
BYP2
TOP VIEW
DHC PACKAGE
16-LEAD (5mm × 3mm) PLASTIC DFN
(Note 1)
IN1, IN2 Pin Voltage .............................................. ±20V
OUT1, OUT2 Pin Voltage ....................................... ±20V
Input-to-Output Differential Voltage....................... ±20V
ADJ1, ADJ2 Pin Voltage ......................................... ±7V
BYP1, BYP2 Pin Voltage ....................................... ±0.6V
SHDN1, SHDN2 Pin Voltage ................................. ±20V
Output Short-Circut Duration.......................... Indefinite
Consult factory for parts specified with wider operating temperature ranges.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
LT3028EFE
LT3028IFE
ORDER PART
NUMBER
FE PART
MARKING
Operating Junction Temperature Range
(Note 2) ............................................ – 40°C to 125°C
Storage Temperature Range
FE Package ....................................... –65°C to 150°C
DHC Package .................................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
T
JMAX
= 150°C, θ
JA
= 38°C/ W, θ
JC
= 8°C/ W
EXPOSED PAD (PIN 17) IS GND
MUST BE SOLDERED TO PCB
3028EFE
3028IFE
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
GND
BYP1
OUT1
OUT1
GND
OUT2
BYP2
GND
GND
ADJ1
SHDN1
IN1
IN2
SHDN2
ADJ2
GND
17
LT3028EDHC
LT3028IDHC
ORDER PART
NUMBER
DHC PART
MARKING
3028
3028I
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage Output 2, I
LOAD
= 100mA ● 1.8 2.3 V
(Notes 3, 10) Output 1, I
LOAD
= 500mA ● 1.8 2.3 V
ADJ1, ADJ2 Pin Voltage V
IN
= 2V, I
LOAD
= 1mA 1.205 1.220 1.235 V
(Notes 3, 4) Output 2, 2.3V < V
IN2
< 20V, 1mA < I
LOAD
< 100mA ● 1.190 1.220 1.250 V
Output 1, 2.3V < V
IN1
< 20V, 1mA < I
LOAD
< 500mA ● 1.190 1.220 1.250 V
Line Regulation (Note 3) ∆V
IN
= 2V to 20V, I
LOAD
= 1mA ● 110 mV
Load Regulation (Note 3) Output 2, V
IN2
= 2.3V, ∆I
LOAD
= 1mA to 100mA 1 12 mV
V
IN2
= 2.3V, ∆I
LOAD
= 1mA to 100mA ● 25 mV
Output 1, V
IN1
= 2.3V, ∆I
LOAD
= 1mA to 500mA 1 12 mV
V
IN1
= 2.3V, ∆I
LOAD
= 1mA to 500mA ● 25 mV
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C. (Note 2)
ELECTRICAL CHARACTERISTICS
3
LT3028
3028f
PARAMETER CONDITIONS MIN TYP MAX UNITS
Dropout Voltage I
LOAD
= 1mA 0.10 0.15 V
(Output 2) I
LOAD
= 1mA ● 0.19 V
V
IN2
= V
OUT2(NOMINAL)
I
LOAD
= 10mA 0.17 0.22 V
(Notes 5, 6, 10)
I
LOAD
= 10mA ● 0.29 V
I
LOAD
= 50mA 0.24 0.31 V
I
LOAD
= 50mA ● 0.40 V
I
LOAD
= 100mA 0.30 0.35 V
I
LOAD
= 100mA ● 0.45 V
Dropout Voltage I
LOAD
= 10mA 0.12 0.19 V
(Output 1) I
LOAD
= 10mA ● 0.25 V
V
IN1
= V
OUT1(NOMINAL)
I
LOAD
= 50mA 0.17 0.22 V
(Notes 5, 6, 10)
I
LOAD
= 50mA ● 0.32 V
I
LOAD
= 100mA 0.21 0.28 V
I
LOAD
= 100mA ● 0.34 V
I
LOAD
= 500mA 0.32 0.37 V
I
LOAD
= 500mA ● 0.47 V
GND Pin Current I
LOAD
= 0mA ● 25 50 µA
(Output 2) I
LOAD
= 1mA ● 60 95 µA
V
IN2
= V
OUT2(NOMINAL)
I
LOAD
= 10mA ● 230 400 µA
(Notes 5, 7) I
LOAD
= 50mA ● 12 mA
I
LOAD
= 100mA ● 2.2 4 mA
GND Pin Current I
LOAD
= 0mA ● 30 75 µA
(Output 1) I
LOAD
= 1mA ● 65 120 µA
V
IN1
= V
OUT1(NOMINAL)
I
LOAD
= 50mA ● 1 1.6 mA
(Notes 5, 7) I
LOAD
= 100mA ● 23 mA
I
LOAD
= 250mA ● 58 mA
I
LOAD
= 500mA ● 10 16 mA
Output Voltage Noise C
OUT
= 10µF, C
BYP
= 0.01µF, I
LOAD
= Full Current, 20 µV
RMS
BW = 10Hz to 100kHz
ADJ1/ADJ2 Pin Bias Current ADJ1, ADJ2 (Notes 3, 8) 30 100 nA
Shutdown Threshold V
OUT
= Off to On ● 0.80 1.4 V
V
OUT
= On to Off ● 0.25 0.65 V
SHDN1/SHDN2 Pin Current V
SHDN1
, V
SHDN2
= 0V ● 0 0.5 µA
(Note 9) V
SHDN1
, V
SHDN2
= 20V ● 1 3.0 µA
Quiescent Current in Shutdown V
IN
= 6V, V
SHDN1
= 0V, V
SHDN2
= 0V 0.01 0.1 µA
Ripple Rejection V
IN
= 2.72V (Avg), V
RIPPLE
= 0.5V
P-P
, f
RIPPLE
= 120Hz, 55 65 dB
I
LOAD
= Full Current
Current Limit Output 2, V
IN2
= 7V, V
OUT2
= 0V 500 mA
V
IN2
= 2.3V, ∆V
OUT2
= –0.1V ● 110 mA
Output 1, V
IN1
= 7V, V
OUT1
= 0V 1.3 A
V
IN1
= 2.3V, ∆V
OUT1
= –0.1V ● 520 mA
Input Reverse Leakage Current V
IN
= – 20V, V
OUT
= 0V ● 1mA
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C. (Note 2)
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT3028 regulator is tested and specified under pulse load
conditions such that T
J
≈ T
A
. The LT3028E is guaranteed to meet
performance specifications from 0°C to 125°C junction temperature.
Specifications over the –40°C to 125°C operating junction temperature
range are assured by design, characterization and correlation with
statistical process controls. The LT3028I is guaranteed and tested over the
full –40°C to 125°C operating junction temperature range.
Note 3: The LT3028 is tested and specified for these conditions with the
ADJ1/ADJ2 pin connected to the corresponding OUT1/OUT2 pin.
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LT3028IDHC#PBF

Mfr. #:
Buy LT3028IDHC#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LDO Voltage Regulators 2x 100mA/500mA L Drop, L N, uP Regs w/ I
Lifecycle:
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