Gamma GM6605 5.0a low dropout precision regulator Datasheet

GM6605
5.0A LOW DROPOUT
PRECISION REGULATOR
Description
Features
GM6605 series of positive adjustable and fixed
regulators is designed to provide 5A output current
with low dropout voltage performance. On-chip
trimming adjusts the reference voltage with an
accuracy of ±1% for adjustable, and ±2% for fixed
output voltage versions. Besides the features
mentioned, GM6605 works well in post regulators
or micro-processor power supplies where low
voltage operation and fast transient response are
required. GM6605 includes over current protection
and thermal shutdown protection as well.
„
Adjustable or Fixed Output
„
Output Current of 5A
„
Low Dropout, 1.5V max at 5A Output
Current
„
0.04% Line Regulation
„
0.2 % Load Regulation
„
100% Thermal Limit Burn-In
„
Fast Transient Response
GM6605 is available in TO-220 and surface-mount TO263 packages.
Applications
„
Microprocessor Supply
„
Medical Equipment
„
Post Regulators for Switching Supplies
„
Printer Supplies
„
Telecommunication Systems
„
Motherboards
Typical Application Circuit
VOUT
VIN
GM6605-x.x
CIN
VIN
VOUT
GM6605-adj
5.0A
COUT
5.0A
VREF
CIN
R1
COUT
Fixed Output Voltage Version
Adjustable Output Voltage Version
VOUT = VREF X ( 1 +
R2
R1
) + IADJ X R2
GM6605V2.04
R2
1
GM6605
5.0A LOW DROPOUT
PRECISION REGULATOR
Marking Information and Pin Configurations (Top View)
TO 252
(D-PAK)
TO 220
GM6605
VVAYWW
TO 263
(D2-PAK)
GM6605
VVAYWW
GM6605
VVAYWW
3. VIN
GM6605G
VVAYWW
3. VIN
G: Green Product
VV: Output Voltage Codes (05: 5.0V, …A: ADJ)
A: Assembly/Test Site Code
Y: Year
WW: Week
2. VOUT
1. GND/ADJ
3. VIN
2 VOUT
1. GND/ADJ
GM6605V2.04
3. V
IN
3. VIN
2 VOUT
1. GND/ADJ
GM6605G
VVAYWW
3. VIN
2. VOUT
1.GND/ADJ
2
2. VOUT
1. GND/ADJ
2. VOUT
1.GND/ADJ
GM6605G
VVAYWW
GM6605
5.0A LOW DROPOUT
PRECISION REGULATOR
Ordering Number
VOUT
Package
Shipping
GM6605-ATA3T
TO-263
50 Units/Tube
GM6605-ATA3R
TO-263
800 Units / Reel
TO-220
50 Units/Tube
GM6605-ATC3T
TO-252
80 Units/Tube
GM6605-ATC3R
TO-252
2,500 Units / Reel
GM6605-1.8TA3T
TO-263
50 Units/Tube
GM6605-1.8TA3R
TO-263
800 Units / Reel
TO-220
50 Units/Tube
GM6605-1.8TC3T
TO-252
80 Units/Tube
GM6605-1.8TC3R
TO-252
2,500 Units / Reel
GM6605-2.5TA3T
TO-263
50 Units/Tube
GM6605-2.5TA3R
TO-263
800 Units / Reel
TO-220
50 Units/Tube
GM6605-2.5TC3T
TO-252
80 Units/Tube
GM6605-2.5TC3R
TO-252
2,500 Units / Reel
GM6605-3.3TA3T
TO-263
50 Units/Tube
GM6605-3.3TA3R
TO-263
800 Units / Reel
TO-220
50 Units/Tube
GM6605-3.3TC3T
TO-252
80 Units/Tube
GM6605-3.3TC3R
TO-252
2,500 Units / Reel
GM6605-5.0TA3T
TO-263
50 Units/Tube
GM6605-5.0TA3R
TO-263
800 Units / Reel
TO-220
50 Units/Tube
GM6605-5.0TC3T
TO-252
80 Units/Tube
GM6605-5.0TC3R
TO-252
2,500 Units / Reel
GM6605-ATB3T
GM6605-1.8TB3T
GM6605-2.5TB3T
GM6605-3.3TB3T
GM6605-5.0TB3T
Adj
1.8V
2.5V
3.3V
5.0V
GM6605V2.04
Ordering Information
3
GM6605
5.0A LOW DROPOUT
PRECISION REGULATOR
Ordering Information – Green Products
Ordering Number
Package
Shipping
GM6605-ATA3TG
TO-263
50 Units/Tube
GM6605-ATA3RG
TO-263
800 Units / Reel
TO-220
50 Units/Tube
GM6605-ATC3TG
TO-252
80 Units/Tube
GM6605-ATC3RG
TO-252
2,500 Units / Reel
GM6605-1.8TA3TG
TO-263
50 Units/Tube
GM6605-1.8TA3RG
TO-263
800 Units / Reel
TO-220
50 Units/Tube
GM6605-1.8TC3TG
TO-252
80 Units/Tube
GM6605-1.8TC3RG
TO-252
2,500 Units / Reel
GM6605-2.5TA3TG
TO-263
50 Units/Tube
GM6605-2.5TA3RG
TO-263
800 Units / Reel
TO-220
50 Units/Tube
GM6605-2.5TC3TG
TO-252
80 Units/Tube
GM6605-2.5TC3RG
TO-252
2,500 Units / Reel
GM6605-3.3TA3TG
TO-263
50 Units/Tube
GM6605-3.3TA3RG
TO-263
800 Units / Reel
TO-220
50 Units/Tube
GM6605-3.3TC3TG
TO-252
80 Units/Tube
GM6605-3.3TC3RG
TO-252
2,500 Units / Reel
GM6605-5.0TA3TG
TO-263
50 Units/Tube
GM6605-5.0TA3RG
TO-263
800 Units / Reel
TO-220
50 Units/Tube
GM6605-5.0TC3TG
TO-252
80 Units/Tube
GM6605-5.0TC3RG
TO-252
2,500 Units / Reel
GM6605-ATB3TG
GM6605-1.8TB3TG
GM6605-2.5TB3TG
GM6605-3.3TB3TG
GM6605V2.04
GM6605-5.0TB3TG
4
VOUT
Adj
1.8V
2.5V
3.3V
5.0V
GM6605
5.0A LOW DROPOUT
PRECISION REGULATOR
Absolute Maximum Ratings
PARAMETER
SYMBOL
RATINGS
UNITS
Input Voltage
VI
15
V
Power Dissipation
PD
Internally
Limited
W
Operating Junction Temperature
TJ
- 40 to 125
°C
Storage Temperature
Tstg
- 60 to 150
°C
260
°C
Lead Temperature 1.6mm (1/6 inch) from case for 10 seconds
Block Diagram
VIN
Thermal
Limit
VOUT
GND
GM6605V2.04
ADJ
For
fixed
output
Options
5
GM6605
5.0A LOW DROPOUT
PRECISION REGULATOR
Electrical Characteristics (TI = 25°C, Inless otherwise noted)
Parameter
Reference
Voltage
GM6605-A
Symbol
VREF
GM6605-1.8
GM6605-2.5
Output
Voltage
VO
GM6605-3.3
GM6605-5.0
Line
Regulation
Load
Regulation
Typ
Max
IOUT = 10mA, VIN – VOUT = 1.5V
1.238
1.250
1.262
10mA ≤ IOUT ≤ 5A, 3.3V ≤VIN ≤7V
1.230
1.250
1.270
IOUT = 10mA, VIN = 3.3V
1.782
1.800
1.818
10mA ≤ IOUT ≤ 5A, 3.3V ≤VIN ≤7V
1.764
1.800
1.836
IOUT = 10mA, VIN = 4V
2.475
2.500
2.525
10mA ≤ IOUT ≤ 5A, 4V ≤VIN ≤7V
2.460
2.500
2.540
IOUT = 10mA, VIN = 4.8V
3.267
3.300
3.333
10mA ≤ IOUT ≤ 5A, 4.8V ≤VIN ≤7V
3.247
3.300
3.353
IOUT = 10mA, VIN = 6.5V
4.950
5.000
5.050
10mA ≤ IOUT ≤ 5A, 6.5V ≤VIN ≤7V
4.920
5.000
5.080
0.04
0.20
%
0.08
0.40
%
1.3
1.5
V
IOUT = 10mA, 3.3V ≤VIN ≤7V
GM6605-1.8
IOUT = 10mA, 3.3V ≤VIN ≤7V
GM6605-2.5
∆VOI
IOUT = 10mA, 4V ≤VIN ≤7V
GM6605-3.3
IOUT = 10mA, 4.8V ≤VIN ≤7V
GM6605-5.0
IOUT = 10mA, 6.5V ≤VIN ≤7V
GM6605-A
VIN –VOUT =1.5V,10mA ≤ IOUT ≤ 5A
GM6605-1.8
VIN = 3.3V, 10mA ≤ IOUT ≤ 5A
GM6605-2.5
∆VOL
VIN = 4.0V, 10mA ≤ IOUT ≤ 5A
GM6605-3.3
VIN = 4,8V, 10mA ≤ IOUT ≤ 5A
GM6605-5.0
VIN = 6.5V, 10mA ≤ IOUT ≤ 5A
Dropout Voltage
VD
IOUT = 5A
Current Limit
ICL
VIN –VOUT =3V
IO(MIN)
GM6605-1.8
Quiescent
Current
GM6605-2.5
GM6605-3.3
Adjust Pin
Current
GM6605-A
IQ
VIN = 5.0V
6.8
V
V
A
5
10
mA
VIN = 4.0V, 10mA ≤ IOUT ≤ 5A
VIN = 4,8V, 10mA ≤ IOUT ≤ 5A
5
10
mA
50
120
µA
VIN = 6.5V, 10mA ≤ IOUT ≤ 5A
IADJ
Temperature Coefficient
Ripple Rejection
5.5
Unit
VIN = 3.3V, 10mA ≤ IOUT ≤ 5A
GM6605-5.0
GM6605V2.04
Min
GM6605-A
Minimum Load Current
6
Test Condition
IOUT = 10mA, 2.75V ≤VIN ≤7V
IOUT = 10mA, VIN – VOUT = 1.5V
RA
IOUT = 5A, VIN – VOUT = 1.5V
60
0.005
%/°C
80
dB
GM6605
5.0A LOW DROPOUT
PRECISION REGULATOR
Application Information
GM6605 series linear regulators provide fixed and adjustable output voltages at currents up to 5.0A.
These regulators are protected against over-current conditions and include thermal shutdown protection.
The GM6605 has a composite PNP-NPN output transistor and require an output capacitor for stability.
A detailed procedure for selecting this capacitor is as below:
Stability Considerations
The output compensation capacitor helps to determine three main characteristics of a linear regulator's
performance: start-up delay, load transient response, and loop stability. The capacitor value and type is
based on cost, availability, size, and temperature constraints. A tantalum or aluminum electrolytic
capacitor is preferred, as a film or ceramic capacitor with almost zero ESR can cause instability. An
aluminum electrolytic capacitor is the least expensive type. But when the circuit operates at low
temperatures, both the value and ESR of the capacitor will vary widely. For optimum performance over
the full operating temperature range, a tantalum capacitor is the best. A 22µF tantalum capacitor will
work fine in most applications. But with high current regulators, such as GM6605 higher capacitance
values will improve the transient response and stability. Most applications for Gm6605 involve large
changes in load current, so the output capacitor must supply instantaneous load current. The ESR of
the output capacitor causes an immediate drop in output voltage given by:
V = I x ESR
In microprocessor applications an output capacitor network of several tantalum and ceramic capacitors
in parallel is commonly used. This reduces overall ESR and minimizes the instantaneous output voltage
drop under transient load conditions. The output capacitor network should be placed as close to the
load as possible for the best results.
Protection Diodes
When large external capacitors are used with most linear regulators, it is wise to add protection diodes. If
the input voltage of the regulator is shorted, the output capacitor will discharge into the output of the
regulator. The discharge current depends on the value of capacitor, output voltage, and rate at which VIN
drops.
1N4002
1N4002
VOUT
VIN
VIN
VOUT
GM6605-Adj
GM6605-3.3
C1
C2
GND
C1
R1
ADJ
CADJ
(a) Fixed version
C2
R2
(b) Adjustable version
For GM6605, the discharge path is through a large junction, and protection diodes are normally not needed.
However, if the regulator is used with large output capacitance values and the input voltage is
instantaneously shorted to ground, damage can occur. In this case, a diode connected as shown above
in Figure 1 is recommended.
GM6605V2.04
Figure 1. Protection Diode Scheme
for large Output Capacitors
7
GM6605
5.0A LOW DROPOUT
PRECISION REGULATOR
Output Voltage Sensing
GM6605 series is a three-terminal regulator, so it cannot provide true remote load sensing. Load
regulation is limited by the resistance of the conductors connecting the regulator to the load. For best
results, GM6605 should be connected as shown 1n F1gure 2.
VIN
VOUT
Conductor
Parasitic
RC Resistance
VOUT
VIN
GM6605-A
GM6605-3.3
GND
Conductor
Parasitic
RC Resistance
ADJ
RLOAD
R1
RLOAD
R2
(a) Fixed version
(b) Adjustable version
Figure 2. Conductor parasitic resistance effects are minimized by
this grounding scheme.
Calculating Power Dissipation and Heat Sink Requirements
GM6605 series include thermal shutdown and current limit circuitry to protect the devices. However, high
power regulators normally operate at high junction temperatures so it is important to calculate the power
dissipation and junction temperatures accurately to be sure to use an adequate heat sink. The case is
connected to VOUT on GM6605, so electrical isolation may be required for some applicat1ons. Thermal
compound should always be used with high current regulators like GM6605.
The thermal characteristics of an IC depend on four factors:
1.
2.
3.
4.
Maximum Ambient Temperature TA (°C)
Power Dissipation PD (Watts)
Maximum Junction Temperature TJ (°C)
Thermal Resistance Junction to amb1ent θJA
The relationship of these four factors is expressed by equation (1):
TJ = TA + PD x θJA
Maximum ambient temperature and power dissipation are determ1ned by the design while the maximum
junction temperature and thermal resistance depend on the manufacturer and the package type.
The maximum power dissipation for a regulator is expressed by equation (2):
PD(MAX) = (VIN(MAX) – VOUT(MIN) ) x IOUT(MIN) + VIN(MIN) x IQ
where:
VIN(MAX) is the maximum input voltage,
VOUT(MIN) is the minimum output voltage,
IOUT(MAX) is the maximum output current
IQ is the max1mum quiescent current at IOUT(MAX).
GM6605V2.04
A heat sink effect1vely increases the surface area of the package to improve the flow of heat away
from the IC into the air. Each material in the heat flow path between the IC and the environment has a
thermal resistance. Like series electrical resistances, these resistance are summed to determine θJA,
the total thermal resistance between the junction and the air. This is expressed by equation (3):
8
θJA = θJC + θCS + θSA
where:
θJC is the thermal resistance of Junction to Case,
θCS is the thermal resistance of Case to Heat Sink,
θSA is the thermal resistance of Heat Sink to Ambient air.
The value for θJA is calculated using equation (3) and the result can be substituted in equation (1). The
value for θCS is 3.5°C/W for a given package typed based on an average d1ie size. For a high current
regulator such as GM6605, the majority of the heat is generated in the power transistor sect1on.
GM6605
5.0A LOW DROPOUT
PRECISION REGULATOR
Typical Performance Characteristics
1.12
Reference Voltage Deviation (%)
+0.3
TCASE = 0°C
1.10
1.05
TCASE = 25°C
1.00
0.95
0.90
TCASE = 125°C
0.85
0.80
0.75
0
+0.2
+0.1
0
-0.1
-0.2
-0.3
0.30 0.60 0.90 1.20 1.50 1.80 2.10 2.40 2.70 3.00
30
60
90
120
TJ (°C)
Figure 1. Dropout Voltage vs. Output Current
Figure 2. Bandgap Reference Voltage Deviation
Vs. Temperature
90
0.65
Minimum Load Current (mA)
80
Ripple Rejection (dB)
0
Output Current(A)
70
60
50
40
30
20
10 1
10
102
104
103
Frequency (Hz)
105
Figure 3. Ripple Rejection vs. Frequency
106
TCASE = 0°C
0.60
TCASE = 25°C
0.55
TCASE = 125°C
0.50
0.45
0.40
1
2
3
4
5
6
7
8
VIN - VOUT (V)
Figure 4. Minimum Load Current vs. VIN - VOUT
GM6605V2.04
Dropout Voltage (V)
1.15
9
GM6605
5.0A LOW DROPOUT
PRECISION REGULATOR
Package Outline Dimensions – TO263
0.390 - 0.415
(9.906 - 10.541)
0.105 - 0.180
(4.191 - 4.572)
0.060
(1.524)
TYP
0.045 - 0.055
(1.143 - 1.397)
15
TYP
0.330 - 0.370
(8.382 - 9.398)
0.059
(1.499)
TYP
0.143 + 0.012
0.143 - 0.002
(3.632 + 0305)
(3.362 - 0.508)
0.050 +/- 0.012
(1.270 +/- 0.305)
0.020 - 0.039
(0.510 - 0.990)
0.090 - 0.110
(2.286 - 2.794)
0.050
(1.270)
0.013 - 0.023
(0.330 - 0.584)
Package Outline Dimensions – TO252
0.205 – 0.215
(5.210 – 5.460)
0.039 – 0.050
(1.020 – 1.270)
0.055 – 0.080
(1.400 – 2.030)
0.018 – 0.023
(0.460 – 0.580)
SEATING PLAN
0.370 – 0.410
(9.400 – 10.420)
0.210 – 0.228
(5.330 – 5.800)
GM6605V2.04
0.090
(2.285)
TYP
10
0.180
(4.570)
TYP
0.045 – 0.060
(1.150 – 1.520)
0.030 – 0.045
(0.760 – 1.140)
0.020
(0.510)
MIN
0.018 – 0.023
(0.460 – 0.580)
GM6605
5.0A LOW DROPOUT
PRECISION REGULATOR
Ordering Number
GM 6605
APM
Gamma
Micro
Circuit
Type
- 1.8 TA3
T
Output
Voltages
Package
Type
Shipping
Type
A: ADJ
1.8: 1.8V
2.5: 2.5V
3.3: 3.3V
5.0: 5.0V
TA3: TO263
TB3: TO220
TC3: TO252
T: Tube
R: Tape & Reel
G
Blank:
Pb-free
G:Green
Note:
Pb-free products:
♦
RoHS compliant and compatible with the current require-ments of IPC/JEDEC J-STD-020.
♦
Suitable for use in SnPb or Pb-free soldering processes with 100% matte tin (Sn) plating.
♦
Lead-free (RoHS compliant)
♦
Halogen free(Br or Cl does not exceed 900ppm by weight in homogeneous material and total of
Br and Cl does not exceed 1500ppm by weight)
GM6605V2.04
Green products:
11