ELM1117HH Bipolar 1A LDO voltage regulator
http://www.elm-tech.com
■General description
ELM1117HH is bipolar LDO three terminal voltage regulator. This series includes thermal shutdown protection
and short circuit current limiter. ELM1117 series is available in fixed version (ELM1117HH-xx Vout:1.2V, 1.8V,
2.5V, 3.3V) and adjustable version (ELM1117HH Vout:1.25V to 14.6V).
■Features
• Output voltage range (fixed)
(adj.)
• Output current
• Low dropout
• Line regulation
• Load regulation
• Thermal limit burn-in
• Current-limit
• Thermal shutdown protection
• Package
■Application
: 1.2V, 1.8V, 2.5V, 3.3V
• High efficiency linear regulators
: 1.25V to 14.6V
• Post regulators for switching supplies
: 1A
• Adjustable power supply
: Typ.1.2 V (at 1A Output current)
: Typ.0.04%
: Typ.0.4%
: 100%
: Typ.1A
: 150°C
: SOT-223
■Maximum absolute ratings
Parameter
Input voltage
Power dissipation
Operating junction temperature
Storage temperature
Thermal resistance junction to ambient
Lead temperature (soldering 10s.)
Minimum ESD rating (HBM)
Symbol
Vin
Pd
Top
Tstg
Rθja
Tlead
Vesd
Limit
+20
Internally limited
-40 to +125
-65 to +150
63
300
3
■Selection guide
ELM1117HH-xx-S, ELM1117HH-S
Symbol
a
b
Package
Product version
c, d
Output voltage
e
Taping direction
* Taping direction is one way.
H: SOT-223
H
12: Vout=1.2V,
18: Vout=1.8V
25: Vout=2.5V,
33: Vout=3.3V
S: Refer to PKG file
6 - 1
Unit
V
W
°C
°C
°C/W
°C
kV
• Fixed version
ELM1117 H H - x x - S
↑ ↑ ↑ ↑ ↑
a b c d e
• Adj. version
ELM1117 H H - S
↑ ↑ ↑
a b e
Rev.1.0
ELM1117HH Bipolar 1A LDO voltage regulator
http://www.elm-tech.com
■Pin configuration
SOT-223(TOP VIEW)
Pin No.
1
2/TAB
3
Pin name
ADJ/GND
VOUT
VIN
■Typical application
• Adjustable type
• Fixed type
Notes:
1) Cin needed if device is far from filter capacitors.
2) Cout minimum value required for stability.
Vout=Vref (1+R2/R1)+Iadj×R2
■Block diagram
Vin
+
_
Vout
For adjustable
voltage device
ADJ
GND
For fixed
voltage
device
6 - 2
Rev.1.0
ELM1117HH Bipolar 1A LDO voltage regulator
■Electrical characteristics
Parameter
Operating voltage
Output voltage(adj.)
Reference voltage
(Note 1)(adj.)
Output voltage
(Note1)(fixed)
Symbol
Vin
Vout
Vout_ref
Vout
http://www.elm-tech.com
Iload=0mA, Top=+25°C, unless otherwise noted.)
Condition
Min. Typ. Max. Unit
*
16
V
Max.Pd < 2.25W
1.25
14.60 V
1.232 1.250 1.268
Vin=+5V, Iload=10mA
V
1.5V≤Vin–Vout≤10V, Iload=10mA to 1A* 1.225 1.250 1.275
Vin=Vout+1.5V,
-1.5
+1.5
Variator from nominal Vout
%
1.5V≤Vin–Vout≤10V,
-2
+2
Iload=0mA to 1A,
Variator from nominal Vout * Vout=+1.2V -3
+2
Output voltage accuracy
Vout_acc Vin=Vout+1.5V, Iload=10mA
(at wafer testing)
Line regulation
ΔVout/ΔVin Iload=10mA, 1.5V≤Vin–Vout≤10V *
Load regulation(Note 1) ΔVout/ΔIout Vin=Vout+1.5V, Iload=10mA to 1A *
Min.load current
Il (min) Vin=+5V, Vadj=0V *
GND pin current
Ignd
Vin=Vout+1.5V, Iload=10mA to 1A *
Adjust pin current
Iadj
1.5V≤Vin–Vout≤10V, Iload=10mA *
Current limit
Ilim
Vin-Vout=1.5V *
Ripple rejection ratio
RR
Vin–Vout= 2.5V, Iload=1A
(Note 2)
Dropout voltage
Vdif
Iload=1A *
(Note 1, 3)
Temperature coefficient
ΔTop
Vin–Vout=1.5V, Iload=10mA *
On-chip thermal limiting
Tlim
-0.6
0
+0.6
%
1.0
0.040 0.238 %
0.4
0.8
%
2
7
mA
3.5
6.0 mA
35
60
μA
1.5
2.0
A
60
dB
1.2
150
1.4
V
0.015 %/°C
°C
The “ * ” denotes the specifications which apply over the full temperature range: −40°C≤ Tj≤ +125°C.
Note 1: Low duty pulse testing with Kelvin connections required.
Note 2: 120Hz input ripple (Cadj for ADJ = 25μF).
Note 3: ΔVout, ΔVref = 1%.
■Marking
• ELM1117HH-xx(Fixed type)
1117S
a,b
c to m
• ELM1117HH(Adj. type)
: Product No.code
: Output voltage (e.g. : 33=3.3V)
: Assembly lot No. :
0 ~ 9 and A ~ Z
1117SA
a to k
6 - 3
: Product No.code
: Assembly lot No. :
0 ~ 9 and A ~ Z
Rev.1.0
ELM1117HH Bipolar 1A LDO voltage regulator
http://www.elm-tech.com
■Application notes
1) Output voltage
The ELM1117HH develops a 1.25V reference voltage between the output and the adjust terminal. By placing
a resistor between these two terminals, a constant current is caused to flow through R1 and down through R2
to set the overall output voltage. Normally, this current is chosen to be the specified minimum load current of
10mA. For fixed voltage devices R1 and R2 are included in the device.
Vout = Vref × ( 1 + R2 / R1 ) + Iadj × R2
Figure 1: Basic adjustable regulator.
2) Load regulation
When the adjustable regulator is used, load regulation will be limited by the resistance of the wire connecting
the regulator to the load. The data sheet specification for load regulation is measured at the output pin of the device.
P
Connect
R1 to Case
L
Connect
R2 to Load
Figure 2: Connections for best load regulation.
Best load regulation is obtained when the top of the resistor divider (R1) is tied directly to the output pin of
the device not to the load. For fixed voltage, devices the top of R1 is internally connected to the output, and the
ground pin can be connected to low side of the load. If R1 is connected to the load, Rp is multiplied by the divider ratio, the effective resistance between the regulator and the load would be:
Rp × (1 + R2 / R1), Rp = Parasitic Line Resistance
3) Input capacitor
An input capacitor of 10μF or greater is recommended. Tantalum or aluminum electrolytic capacitors can be
used for bypassing. Larger Values will improve ripple rejection by bypassing the input to the regulator.
4) Ripple Rejection
The curves for Ripple Rejection were generated using an adjustable device with the adjust pin bypassed. With
a 25μF bypassing capacitor, 75dB ripple rejection is obtainable at any output level. The impedance of the adjust
pin capacitor, at the ripple frequency, should be < R1. R1 is normally in the range of 100W to 200W. The size of
the required adjust pin capacitor is the function of the input ripple frequency. At 120Hz, with R1=100Ω, the adjust pin capacitor should be 13μF. For fixed voltage devices and adjustable devices without an adjust pin capacitor, the output ripple will increase as the ratio of the output voltage to the reference voltage (Vout / Vref).
6 - 4
Rev.1.0
ELM1117HH Bipolar 1A LDO voltage regulator
http://www.elm-tech.com
Load Transient Response
Line Transient Response
Load Regulation (Input Voltage = 5V)
Line Regulation (Output Current = 100mA)
3.325
3.324
3.323
3.322
3.321
3.32
3.319
3.318
3.317
3.316
3.315
3.314
3.321
ELM1117HH-33
3.319
0
0.2
0.4
0.6
0.8
3.318
3.317
3.316
3.315
3.314
1
5
Output Current (A)
Output Voltage vs. Input Voltage
7
9
11
13
Input Voltage (V)
15
Input Current vs. Input Voltage
4
6
3.3V
3.5
3
5
2.5V
2.5
Input Current (mA)
Output Voltage (V)
ELM1117HH-33
3.32
Output Voltage (V)
Output Voltage (V)
■Typical characteristics
1.8V
2
1.5
1
0.5
0
ELM1117HH-33
4
3
2
1
0
0
1
2
3
Input Voltage (V)
4
5
6
6 - 5
0
2
4
6
8
Input Voltage (V)
10
12
14
16
Rev.1.0
ELM1117HH Bipolar 1A LDO voltage regulator
http://www.elm-tech.com
Output Voltage vs. Temperature (3.3V)
3
3.4
2.5
3.35
2
3.3
Output Voltage (V)
Current Limit (A)
Current Limit vs. Input Voltage
1.5
1
ELM1117HH-33
0.5
0
5
7
9
Input Voltage (V)
11
13
3.2
3.15
3.1
15
-50
Output Voltage vs. Temperature (2.5V)
-25
0
25
50
Temperature (°C)
75
100
125
Output Voltage vs. Temperature (1.8V)
2.65
1.95
2.6
1.9
2.55
1.85
Output Voltage (V)
Output Voltage (V)
3.25
2.5
2.45
2.4
1.8
1.75
1.7
1.65
2.35
-50
-25
0
25
50
Temperature (°C)
75
100
125
-50
-25
0
25
50
Temperature (°C)
75
100
125
PSRR vs. Frequency
90
80
PSRR (dB)
70
60
50
40
30
20
0.01
0.1
1
10
Frequency (KHz)
100
6 - 6
Rev.1.0