G5E1284 Fixed-mode Regulator Datasheet

G5E1284 Datasheet, PDF, Equivalent


Part Number

G5E1284

Description

4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator

Manufacture

GTM

Total Page 4 Pages
Datasheet
Download G5E1284 Datasheet


G5E1284
www.DataSheet4U.com
ISSUED DATE :2005/05/24
REVISED DATE :2006/03/29B
G5E1284
4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Description
The G5E1284 is 4A regulator with extremely low dropout voltage. This product is specifically designed to
provide well regulated supply for applications requiring 2.8V or lower voltages from 3.3V ATX power supplies
where high efficiency of the switch can be achieved without the cost and complexity associated with switching
regulator. One such application is the new graphic chipsets that requires anywhere from 2.4V to 2.7V supply.
Features
0.7V maximum dropout voltage at 4A load current
Built-in thermal shutdown
Output current limiting
Adjustable or fixed output voltage 1.5V,1.8V,2.5V,3.3V,5.0V
Fast transient response
Good noise rejection
Package Dimensions
Typical Application
REF.
A
b
c
D
E
L4
Millimeter
Min. Max.
4.40 4.80
0.76 1.00
0.36 0.50
8.60 9.00
9.80 10.4
14.7 15.3
REF.
L5
c1
L
e
L1
Ø
Millimeter
Min. Max.
6.20 6.60
1.25 1.45
13.25 14.25
1.70 REF.
2.60 2.89
3.71 3.96
Block Diagram
G5E1284-25
Pin Descriptions
Name
I/O
Adj (Gnd)
Vsense
I
Vin I
Vctrl
Vout
I
O
Description
A resistor divider from this pin to the Vout pin and ground sets the output voltage. (Gnd only for fixed mode)
The pin is the positive side of the reference that allows remote load sensing to achieve excellent load
regulation. A minimum of 10uF capacitor must be connected from this pin to ground to insure stability.
The input pin of regulator. Typically a large storage capacitor is connected from this pin to ground to insure
that the input voltage does not sag below the minimum dropout voltage during the load transient response.
This pin must always be higher than Vout in order for the device to regulate.
This pin is the supply pin for the internal control circuit as well as the base drive for the pass transistor. This
pin must always by higher than the Vout pin in order the device to regulate. A minimum of 100uF capacitor
must be connected from this pin to ground to insure stability.
The output of the regulator. A minimum of 100uF capacitor must be connected from this pin to ground to
insure stability.
G5E1284
Page: 1/4

G5E1284
ISSUED DATE :2005/05/24
REVISED DATE :2006/03/29B
Absolute Maximum Ratings
Symbol
Parameter
Vin Input Voltage
Vctrl Control Input Voltage
PD Power Dissipation (with heat sink or amount of copper board needed.)
TST Storage Temperature Range
TOP Operating Junction Temperature Range
Ratings
16
18
2.4 ~ 4.4
-65 ~ + 150
0 ~ + 150
Unit
V
V
W
Electrical Characteristics Unless otherwise specified, these specifications apply over, Cin=1uF, Cout=10uF, TJ =0~150 .
Typical value refer to TJ =25 . Vout=Vsense
Parameter
Conditions
MIN
TYP
MAX
UNIT
Reference Voltage
G5E1284-ADJ Io=10mA, TJ =25 , (Vin-Vout)=0.7V, Vctrl=Vin+1V
1.225 1.250 1.275
V
G5E1284-15 Io=10mA, TJ =25 , 2.2V Vin 12V, Vctrl=Vin+1V
1.470 1.500 1.530
V
G5E1284-18 Io=10mA, TJ =25 , 2.5V Vin 12V, Vctrl=Vin+1V
1.764 1.800 1.836
V
Output Voltage
G5E1284-25 Io=10mA, TJ =25 , 3.2V Vin 12V, Vctrl=Vin+1V
2.450 2.500 2.550
V
G5E1284-33 Io=10mA, TJ =25 , 4.0V Vin 12V, Vctrl=Vin+1V
3.235 3.300 3.365
V
G5E1284-50 Io=10mA, TJ =25 , 5.7V Vin 12V, Vctrl=Vin+1V
4.900 5.000 5.100
V
Line Regulator
G5E1284-XX Io=10mA, TJ =25 , Vout+0.7<Vin<12, Vctrl=Vin+1V
-
- 0.2 %
G5E1284-ADJ (Vin-Vout)=2V, 0mA<Io<4A, TJ=25 , Vctrl=Vin+1V
-
-
1%
G5E1284-15 Vin=3.0V, 0mA<Io<4A, TJ=25 , Vctrl=4V
- 12 15 mV
Load Regulation
G5E1284-18
G5E1284-25
Vin=3.3V, 0mA<Io<4A, TJ=25 , Vctrl=4.3V
Vin=4.0V, 0mA<Io<4A, TJ=25 , Vctrl=5V
- 15 18 mV
- 20 25 mV
G5E1284-33 Vin=5.0V, 0mA<Io<4A, TJ=25 , Vctrl=6V
- 26 33 mV
G5E1284-50 Vin=8.0V, 0mA<Io<4A, TJ=25 , Vctrl=9V
- 40 50 mV
Dropout Voltage
(Vctrl-Vout)
G5E1284-ADJ
Vadj=0V, for all conditions below. ( Vout=1%Vout)
Vin=2.05V, Io=1.5A
Vin=2.05V, Io=3.0A
Vin=2.05V, Io=4.0A
-
1.15
1.18
V
1.10 1.25
(fixed model) Vin= Vout +0.8V, Io=4.0A ( Vout=1%Vout)
- 1.10 1.25 V
G5E1284-ADJ
Vadj=0V, for all conditions below. ( Vout=1%Vout)
Vctrl=2.75V, Io=1.5A
Vctrl=2.75V, Io=3.0A
Vctrl=2.75V, Io=4.0A
-
0.26 0.38
0.50 0.60
V
0.70 0.85
Dropout Voltage
(Vin-Vout)
G5E1284-15
G5E1284-18
Vctrl=3.3V, Io=4.0A ( Vout=1%Vout)
G5E1284-25
G5E1284-33
Vctrl=Vout +1.5V, Io=4.0A ( Vout=1%Vout)
- 0.70 0.85 V
G5E1284-50
Current Limit
Vctrl=2.75V, Vin=2.05V, Vo=100mV, Vadj=0V
4.2 - - A
Minimum Load Current Vctrl=5V, Vin=3.3V, Vadj=0V
- 5 10 mA
Thermal Regulation
Ripple Rejection
Control Pin Current
30ms pulse
Vctrl=5V, Vin=5V, Io=4.0A, Vadj=0V, TJ=25 , Vripple=1Vpp at 120Hz
G5E1284-ADJ
Vadj=0V, for all conditions below.
Vctrl=2.75V, Vin=2.05V, Io=1.5A
Vctrl=2.75V, Vin=2.05V, Io=3.0A
Vctrl=2.75V, Vin=2.05V, Io=4.0A
G5E1284-15 Vctrl=3.3V, Vin=2.3V, Io=4.0A
G5E1284-18
-
60
-
0.01
70
6
30
33
0.02
-
25
60
70
%/W
dB
mA
G5E1284-25
G5E1284-33
Vctrl= Vout +1.5V, Vin= Vout +0.8V, Io=4.0A
- 33 70 mA
Adjust Pin Current
Quiescent Current
G5E1284-50
Vctrl=2.75V, Vin=2.05V, Io=10mA, Vadj=0
Vctrl=13V, Vin=12V, Io=10mA (fixed model)
- 50 150 uA
- - 12 mA
Thermal Resistance
Junction-to-Case
Control Circuitry/Power Transistor
- 2.5 -
/W
Note 1: G5E1284-ADJ incorporates an internal thermal shutdown that protects the device where the junction temperature exceeds the
allowable maximum junction temperature.
G5E1284
Page: 2/4


Features www.DataSheet4U.com ISSUED DATE :2005/05 /24 REVISED DATE :2006/03/29B G5E1284 The G5E1284 is 4A regulator with extrem ely low dropout voltage. This product i s specifically designed to provide well regulated supply for applications requ iring 2.8V or lower voltages from 3.3V ATX power supplies where high efficienc y of the switch can be achieved without the cost and complexity associated wit h switching regulator. One such applica tion is the new graphic chipsets that r equires anywhere from 2.4V to 2.7V supp ly. 4A Ultra Low Dropout Positive Adju stable or Fixed-mode Regulator Descript ion Features Package Dimensions 0.7V maximum dropout voltage at 4A load cur rent Built-in thermal shutdown Output c urrent limiting Adjustable or fixed out put voltage 1.5V,1.8V,2.5V,3.3V,5.0V Fa st transient response Good noise reject ion REF. A b c D E L4 Millimeter Min. Max. 4.40 4.80 0.76 1.00 0.36 0.50 8.6 0 9.00 9.80 10.4 14.7 15.3 REF. L5 c1 L e L1 Ø Millimeter Min. Max. 6.20 6.60 1.25 1.45 13.25 14.25 .
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