gm7109 Gamma Microelectronics, gm7109 Datasheet

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gm7109

Manufacturer Part Number
gm7109
Description
150khz, 2a Step Down Voltage Switching Regulators
Manufacturer
Gamma Microelectronics
Datasheet
Application
Description
Pre-regulator for linear regulators
High-efficiency step-down buck regulator
Typical Application Circuits
GM7109 series is designed to provide all the
active function for a
regulator, and drives a maximum load current as
high as 2A
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
requiring a smaller heat sink or even no need
heat sink.
GM7109 performs well with standard inductors
from most
design of
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.
GM7109 operates at a switching frequency of
150 kHz which
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.
three-terminal linear regulators, and is
switch-mode power supplies.
of manufacturers, and simplifying the
line and load regulations. GM7109 is
allowing smaller size filter
1
Unregulated
DC Input
step-down (buck) switching
680µF
C
IN
1
GM7109-5.0
V
IN
SD
External
4
GND
Output
On-card/board switching regulators
Positive to negative converter (buck-boost)
LCD Monitors
5, 6, 7, 8
FB
Features
3
2
Standard SOP8 & PSOP8 package
3.3V, 5V, and Adjustable output versions
Adjustable version output voltage range
1.23V to 37V
V
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
150KHz, 2A STEP DOWN VOLTAGE
OUT
D1
1N5824
accuracy is to
68µH
L1
SWITCHING REGULATORS
C
220µF
5V
regulated
outpu
OUT
www.gammamicro.com.tw
±
t,
2% under specified
GM7109
1

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gm7109 Summary of contents

Page 1

... Description 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 ...

Page 2

... A: Assembly / Testing factory code Y: Year WW: Week Ordering Information Ordering Number GM7109-AS8T GM7109-AS8R GM7109-APS8T GM7109-APS8R GM7109-3.3S8T GM7109-3.3S8R GM7109-3.3PS8T GM7109-3.3PS8R GM7109-5.0S8T GM7109-5.0S8R GM7109-5.0PS8T GM7109-5.0PS8R 2 150KHz, 2A STEP DOWN VOLTAGE SO8 & PSO8 GND GND GND GND GM7109 VVVAYWW ...

Page 3

... V + 0 0.3 IN Internally Limited ) 150 + 150 - 40 to 125 2 + 260 SD 2.5V Start UP Reference COMP Current 2.5V Limit COMP COMP Latch Driver Reset Thermal Freq. Shift Limit 150KHz OSC GM7109 Unit ℃/W ℃ ℃ ℃ kV ℃ 220 220mV 2A Switch OUTPUT GND 3 ...

Page 4

... Parameter Condition Output Voltage 4.75V < Efficiency V =12V Electrical Characteristics: GM7109-5.0 (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 7V < V < 40V, 0.2A < ...

Page 5

... Average Outgoing Quality Level (AOQL). 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 ...

Page 6

... 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 ...

Page 7

... OUT I LOAD -50 -25 JUNCTION TEMPERATURE (°C) Figure 10. Switching Frequency 160 155 150 145 140 135 130 120 20 25 -50 -25 JUNCTION TEMPERATURE (°C) GM7109 SWITCHING REGULATORS V = 12V lN V =5V OUT 100 4.5V < V < 40V SWITCH Switch OFF 0 25 ...

Page 8

... D 0.050 (1.270) TYP 0.053 - 0.059 (1.346 - 1.753) SEATING PLAN 0.008 - 0.010 0.004 - 0.010 (0.203 - 0.254) (0.012 - 0.254) GM7109 SWITCHING REGULATORS 0.150 - 0.157 (3.810 - 3.988) 8.0 MAX 0.150 - 0.157 (3.810 - 3.988) 8.0 MAX ...

Page 9

... Ordering Number GM 7109 A APM Gamma Circuit Type Micro 150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS S8 Output Voltage Package Type A: Adj S8 3.3 = 3.3V PS8: Power SO 8 5.0 =5.0V GM7109 R Shipping Type R: Taping & Reel T: Tube 9 ...

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