Gamma GM7109-AS8R 150khz, 2a step down voltage switching regulator Datasheet

GM7109
150KHz, 2A STEP DOWN VOLTAGE
SWITCHING REGULATORS
Description
Features
GM7109 series is designed to provide all the
active function for a step-down (buck) switching
regulator, and drives a maximum load current as
high as 2A line and load regulations. GM7109 is
available in fixed output voltages of 3.3V, 5V,
and a versatile Adjustable output version.
These regulators are simple to use and require
minimum number of external components. The
features include internal frequency compensation
and a fixed-frequency oscillator.
The GM7109 is high-efficiency replacements for
popular three-terminal linear regulators, and is
requiring a smaller heat sink or even no need
heat sink.
GM7109 performs well with standard inductors
from most of manufacturers, and simplifying the
design of switch-mode power supplies. External
shutdown is included with 80 µA (typical) standby
current. The output switch has cycle-by-cycle
current limiting as well as thermal shutdown for
full protection under fault conditions.
‹
Standard SOP8 & PSOP8 package
‹
3.3V, 5V, and Adjustable output versions
‹
Adjustable version output voltage range
1.23V to 37V
‹
VOUT accuracy is to ±2% under specified
input voltage the output load conditions
‹
Input voltage range up to 40V
‹
Requires only 4 external components with
High efficiency
‹
TTL shutdown capability, low power
standby mode
‹
Built-in thermal shutdown, current limit
protection
‹
Uses standard inductors
‹
150 kHz fixed frequency internal oscillator
GM7109 operates at a switching frequency of
150 kHz which allowing smaller size filter
components than what would be needed with
lower frequency switching regulators.
GM7109 series are available in a standard 8-lead
SO package or 8 lead SO package with heat
sink.
Application
Pre-regulator for linear regulators
On-card/board switching regulators
High-efficiency step-down buck regulator
Positive to negative converter (buck-boost)
LCD Monitors
Typical Application Circuits
FB 3
1 VIN
Output 2
CIN
680µF
SD
4
L1
68µH
GND
5, 6, 7, 8
D1
1N5824
5V
regulated
output,
COUT
220µF
www.gammamicro.com.tw
GM7109V1.00
GM7109-5.0
1
Unregulated
DC Input
1
GM7109
150KHz, 2A STEP DOWN VOLTAGE
SWITCHING REGULATORS
Marking Information and Pin Configurations (Top View)
SO8 & PSO8
GND
GND
GND
GND
GM7109
VVVAYWW
VIN
VOUT
SD
FB
VVV: 033=3.3V, 050=5.0V, 00A=ADJ
A: Assembly / Testing factory code
Y: Year
WW: Week
Ordering Information
GM7109V1.00
Ordering Number
2
Output Voltage
Package
Shipping
GM7109-AS8T
Adj
SOP8
100 Units / Tube
GM7109-AS8R
Adj
SOP8
2500 Units / Reel
GM7109-APS8T
Adj
PSOP8
100 Units / Tube
GM7109-APS8R
Adj
PSOP8
2500 Units / Reel
GM7109-3.3S8T
3.3
SOP8
100 Units / Tube
GM7109-3.3S8R
3.3
SOP8
2500 Units / Reel
GM7109-3.3PS8T
3.3
PSOP8
100 Units / Tube
GM7109-3.3PS8R
3.3
PSOP8
2500 Units / Reel
GM7109-5.0S8T
5.0
SOP8
100 Units / Tube
GM7109-5.0S8R
5.0
SOP8
2500 Units / Reel
GM7109-5.0PS8T
5.0
PSOP8
100 Units / Tube
GM7109-5.0PS8R
5.0
PSOP8
2500 Units / Reel
GM7109
150KHz, 2A STEP DOWN VOLTAGE
SWITCHING REGULATORS
Absolute Maximum Ratings (Note 1)
Rating
Value
Unit
45
V
SD Pin Input Voltage / Feed Back Pin Voltage
-0.3 + VIN + 0.3
V
Output Voltage to Ground (Steady State)
-0.3 + VIN + 0.3
V
Internally Limited
-
36
℃/W
- 65 to 150
℃
+ 150
℃
Operating Temperature Range
- 40 to 125
℃
Minimum EDS Rating (Note 2)
2
kV
+ 260
℃
Maximum Supply Voltage
Power Dissipation
Thermal Resistance – Junction to Ambient (θJA)
** 2 square inch of FR-4, double sided, 1oz. minimum copper weight, is
recommended
Storage Temperature Range
Maximum Junction Temperature
Lead Temperature (Soldering, 10 sec)
Block Diagram
SD
VIN
Current
Source
Bias
1.235V
Reference
2.5V
Reference
Start UP
220
COMP
Current
Limit
2.5V
COMP
GM
R2
220mV
2A
Switch
AMP
COMP
Latch
Driver
R1 = 2.5K
Reset
Freq. Shift
150KHz
OSC
Thermal
Limit
OUTPUT
GND
GM7109V1.00
For 3.3V, R2 = 4.2K
For 5.0V, R2 = 7.6K
For Adj, R2 = 0 and R1 = OPEN
3
GM7109
150KHz, 2A STEP DOWN VOLTAGE
SWITCHING REGULATORS
Electrical Characteristics: GM7109-ADJ
(Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature
rage)
Parameter
Condition
Output Voltage
4.5V < VIN < 40V, 0.2A < ILOAD < 2A
Efficiency
VIN =12V, ILOAD=2.0A, VOUT = 3V
Symbol
VOUT
Min
1.193
1.180
η
Typ
1.230
Max
Unit
1.267
V
1.280
88
%
Electrical Characteristics: GM7109-3.3
(Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature
rage)
Parameter
Condition
Output Voltage
4.75V < VIN < 40V, 0.2A < ILOAD < 2A
Efficiency
VIN =12V, ILOAD=2.0A
Symbol
VOUT
Min
3.168
3.135
η
Typ
3.300
Max
Unit
3.432
V
3.465
73
%
Electrical Characteristics: GM7109-5.0
GM7109V1.00
(Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature
rage)
4
Parameter
Condition
Output Voltage
7V < VIN < 40V, 0.2A < ILOAD < 2A
Efficiency
VIN =12V, ILOAD=2.0A
Symbol
VOUT
η
Min
4.800
4.7500
Typ
5.000
80
Max
5.200
5.250
Unit
V
%
GM7109
150KHz, 2A STEP DOWN VOLTAGE
SWITCHING REGULATORS
Electrical Characteristics: All Output Voltage Versions
(Specifications with standard type face are for TJ = 25℃, and those with bold face type apply over full Operating Temperature
rage. Unless otherwise specified, VIN = 12V)
Parameter
Condition
Symbol
Min
Typ
Feedback Bias
Current
VFB =1.3V (Adjustable Version Only)
Ib
-
10
Oscillator
Frequency
(Note 6)
fo
Saturation
Voltage
IOUT = 2A (Notes 7, 8)
Max Duty Cycle
(ON)
(Note 8)
DC
100
Min Duty Cycle
(OFF)
(Note 9)
DC
0
Current Limit
Peak Current (Notes 7, 8)
lCL
Output Leakage
Current
Output =0V (Notes 7, 9, 10)
50
Unit
nA
100
127
150
110
VSAT
Max
-
173
kHz
173
1.16
1.4
V
1.5
Output = -0.9V (Note 10)
Quiescent
Current
(Note 9)
Standby
Quiescent
Current
SD Pin = 5V (OFF), Note 10
-
%
%
3.4
A
-
-
100
µA
-
2
-
mA
lQ
-
5
-
mA
lSTBY
-
70
200
µA
lL
SD Pin Logic
lnput Level
Low (ON)
VIH
-
1.3
0.6
High (OFF)
VIL
2.0
1.3
-
SD Pin lnput
Current
VLOGlC = 2.5V (OFF)
IH
5
15
µA
VLOGlC = 0.5V (ON)
IL
0.02
5
µA
V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating
Ratings indicate conditions for which the device is intended to be functional, but do not
guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical
Characteristics.
Note 2: The human body model is a 100pF capacitor discharged through a 1.5KΩresistor into each pin.
Note 3: Typical numbers are at 25°C and represent the most likely norm.
Note 5: External components such as the catch diode, inductor, input and output capacitors, and voltage
programming resistors can affect switching regulator system performance. When the GM7109 is used as
shown in the Figure 1 test circuit, system performance will be as shown in system parameters section of
Electrical Characteristics.
Note 6: The switching frequency is reduced when the second stage current limit is activated.
Note 7: No diode, inductor or capacitor connected to output pin.
Note 8: Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 9: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version.
GM7109V1.00
Note 4: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type
face). All room temperature limits are 100% production tested. All limits at temperature extremes are
guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to
calculate Average Outgoing Quality Level (AOQL).
5
GM7109
150KHz, 2A STEP DOWN VOLTAGE
SWITCHING REGULATORS
Test Circuit and Layout Guidelines
Careful layout is important with any switching regulators. Rapidly switching currents associated with
wiring inductance generate voltage transients which can cause problems. To minimize inductance
and ground loops, the lengths of the leads indicated by heavy lines in Figure 1&2 below should be
kept as short as possible. Single point grounding (as indicated or ground plane construction should
be used for best results. When using the Adjustable version, place the programming resistors as
close as possible to GM7109, to keep the sensitive feedback wiring short.
3
FB
1
VIN
VIN
Unregulatedd
DC Input
L1
100µH
GM7109-x.x
5~8
GND
CIN
100µF
4
SD
2
VOUT
VOUT
D1
L
O
A
D
COUT
680µF
Figure 1 Fixed Ouput Votlage Versions
CIN = 470µF, Aluminum Electrolytic
COUT = 220µF, 25V, Aluminum Electrolytic
D1 = Schottky, 5A/40V
L1 = 68µH
1
3
FB
GM7109-A
VIN
GM7109V1.00
VIN
Unregulatedd
DC Input
6
CIN
100µF
5~8
GND
4
SD
L1
100µH
VOUT
2
VOUT
R2
D1
COUT
680µF
Figure 2 Adjustable Ouput Votlage Versions
CIN = 470µF, Aluminum Electrolytic
COUT = 220µF, 25V, Aluminum Electrolytic
D1 = Schottky, 5A/40V
L1 = 68µH
VOUT = VREF (1 + R2/R1)
R1
L
O
A
D
GM7109
150KHz, 2A STEP DOWN VOLTAGE
SWITCHING REGULATORS
Typical Performance Characteristics
Figure 3. Switch Saturation Voltage
1.4
SWlTCH CURRENT LlMlT (A)
1.2
1.1
TJ = - 40°C
1.0
0.9
0.8
25°
125 °C
C
2
1
0
3
VlN = 12V
VOUT =5V
5.0
4.5
4.0
3.5
-50
4
ILOAD = 2A
1.0
ILOAD = 1A
0.8
16
SUPPLY VOLTAGE (V)
CURRENT (µA)
TJ = -40°C and 125°C
40
20
Switch OFF
4
4
3
2
1
VOUT = 1.23V
ILOAD = 120mA
Figure 10. Switching Frequency
8
160
VIN = 40V
TJ = -40°C and 125°C
7
155
FREQUENCY (kHz)
6
CURRENT(µA)
8
0
-50 -25 0
25 50 75 100 125
JUNCTION TEMPERATURE (°C)
40
Figure 9. SD Pin Current (Sinking)
5
4
3
2
150
145
140
135
130
1
0
Switch ON
5
TJ = 25°C
10
20
30
SUPPLY VOLTAGE (V)
125
Figure 8. Minimum Operating Supply Voltage
VON/OFF = 5V
0
0
100
12
150
60
75
0
-50 -25 0
25 50 75 100 125
JUNCTION TEMPERATURE (°C)
Figure 7. Shutdown Quiescent Current
80
50
4.5V < VIN < 40V
ISWITCH = 0
20
0.6
-50 -25 0
25 50 75 100
JUNCTION TEMPERATURE (°C)
100
25
24
SWlTCH CURRENT (mA)
INPUT - OUTPUT DIFFERENTIAL
L = 33µH
RIND = 0.04
VOUT = VREG = 50mV
1.2
0
Figure 6. Operating Quiescent Current
Figure 5. Dropout Voltage
1.6
1.4
-25
JUNCTlON TEMPERATURE (°C)
SWlTCH CURRENT (A)
0
5
10
15
20
SD PlN VOLTAGE(V)
25
120
-50 -25 0
25 50 75 100 125
JUNCTION TEMPERATURE (°C)
GM7109V1.00
SATURATlON VOLTAGE (V)
5.5
VlN =12V
1.3
0.7
0.6
Figure 4. Switch Current Limit
7
GM7109
150KHz, 2A STEP DOWN VOLTAGE
SWITCHING REGULATORS
Package Outline Dimensions – SO 8
0.189 - 0.197
(4.800 - 5.004)
0.228 - 0.244
(5.791 - 6.198)
0.016 - 0.050
(0.406 - 0.270)
D
0.014 - 0.020
(0.356 - 0.508)
0.050
(1.270)
TYP
0.150 - 0.157
(3.810 - 3.988)
0.053 - 0.059
(1.346 - 1.753)
SEATING PLAN
0.004 - 0.010
(0.012 - 0.254)
0.008 - 0.010
(0.203 - 0.254)
8.0
MAX
Package Outline Dimensions – PSO 8
0.189 - 0.197
(4.800 - 5.004)
0.090
(2.286)
0.095 - 0.130 0.228 - 0.244
(2.410 - 3.300) (5.791 - 6.198)
0.016 - 0.050
(0.406 - 0.270)
D
0.014 - 0.020
(0.356 - 0.508)
0.050
(1.270)
TYP
0.150 - 0.157
(3.810 - 3.988)
0.053 - 0.059
(1.346 - 1.753)
GM7109V1.00
SEATING PLAN
8
0.004 - 0.010
(0.012 - 0.254)
0.008 - 0.010
(0.203 - 0.254)
8.0
MAX
GM7109
150KHz, 2A STEP DOWN VOLTAGE
SWITCHING REGULATORS
Ordering Number
GM 7109 A
APM Gamma
R
Output Voltage
Package Type
Shipping Type
A: Adj
3.3 = 3.3V
5.0 =5.0V
S8: SO 8
PS8: Power SO 8
R: Taping & Reel
T: Tube
GM7109V1.00
Micro
Circuit Type
S8
8
10
6
9
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