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PDF GM3326 Data sheet ( Hoja de datos )
| Número de pieza | GM3326 | |
| Descripción | STEP-UP & DOWN DC/DC CONVERTER CONTROLLER ICS | |
| Fabricantes | Gamma Microelectronics | |
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Description
GM3326 is step-up/down DC/DC converter controller ICs
with fast, and low ON resistance drivers built-in. A versatile
step-up/ down DC/DC converter can be realised by using
with large output current only 4 basic external components
- transistors, coils, diodes, and capacitors.
Output voltage is selectable in 0.1V steps within a 2.4V ~
6.0V ( ± 2.5% accuracy) range, and switching frequency is
set at or 300KHz.
GM3326 switches from PWM to PFM control during light
loads, and the series offers high efficiencies from light
loads through to large output currents.
Soft-start time is internally set to 10 msec, which offers
protection against rush currents when the power is
switched on and also against voltage overshoot.
During shutdown (CE pin = L), consumption current can be
reduced to as little as 0.5µA or less.
Features
Input Voltage Range : 2.0V ~ 10V
Output Voltage Range : 2.4V ~ 6.0V ( ± 2.5%
accuracy) (selectable in 0.1V steps)
Oscillation Frequency : 300KHz ( ± 15%
accuracy)
Output Current : more than 250mA (VIN=2.4V,
VOUT=3.3V)
Efficiency : 81% (typ) at 5.0V, 78% (typ) at 3.3V
Stand-By : ISTB = 0.5µA (max)
Output Voltage Internal Set-Up
SOT-25 Package
Application
Mobile phones
PDAs
Palmtop computers
TYPICAL APPLICATION CIRCUITS
Portable audio equipment
Various power supplies
VOUT
Schottky
MBRS140
3L colis SMTSPR5D5047C-220
Youth coils YCDH57-220
L
Pch MOSFET
FDN338P
Nch MOSFET
FDN339AN
Schottky
MBRS140
VIN
+
CL
68µF/ 10V
Chemi_con
PT- Series
VOUT
EXT
GM3326 VDD
CE GND
+
CIN
100µF/ 10V
Chemi_con
PT- Series
www.gammamicro.com 1
1 page  
OPERATIONAL EXPLANATION
VOUT
Schottky
Nch
MOSFET
L
+
CL
Pch MOSFET
VIN
Schottky
VOUT EXT
CE
CE
VIN
GND
+
CIN
<Circuit Connection Example>
GM3326 is PWM (PWM/ PFM switching) step-up/down DC/DC converter controller ICs. Gm3326 switches to PFM
operations during light loads and is very efficient over a wide range in relation to load. Further, the efficiency can be
maintained over a wide input voltage range as both step-up & step-down operations are PWM controlled. Output voltage
settings are laser trimmed.
[ON TIME]
P-Ch MOSFET = ON, N-Ch MOSFET = ON : Current flows from VIN via Pch MOSEFT, L, Nch FET to GND : L is charged.
[OFF TIME]
P-Ch MOSFET (PSW) = OFF, N-Ch MOSFET (NSW) = OFF : Current flows from GND via Schottky 1, L, Schottky 2, to
VOUT : VOUT rises due to the charge stored at L. By comparing VOUT with the internal reference voltage, the ON TIME vs
OFF TIME ratio can be regulated & output stability can be protected.
ELECTRICAL CHARACTERISTICS (GM3326- 3.3V)
VOUT= 3.3V, FOSC= 300kHz
TA= 25°C
PARAMETER
SYMBOL
CONDITIONS
Min Typ Max Unit
Output Voltage
Supply Voltage
Supply Current 1
Supply Current 2
Stand- By Current
Oscillation Frequency
Max. Duty Ratio
VOUT
VDD
IDD 1
IDD 2
ISTB
FOSC
MAXDTY
3.218
2.0
VOUT= CE: Set Output Voltage X 0.95 applied
VOUT= CE: Set Output Voltage + 0.5 applied
VOUT= Set Output Voltage X 0.95 applied, CE= 0V
VDD=VOUT= CE: Set Output Voltage X 0.95 applied
VDD=VOUT= CE: Set Output Voltage X 0.95 applied
-
-
-
255
78
3.300
-
130
20
-
300
85
3.383
10.0
200
35
0.5
345
92
V
V
µA
µA
µA
KHz
%
PFM Duty Ratio
Efficiency Note 1
Soft- Start Time
CE 'H' Voltage
CE 'L' Voltage
EXT/ 'H' ON Resistance
EXT/ 'L' ON Resistance
PFMDTY
EFFI
TSS
VCEH
VCEL
REXTBH
REXTBL
No load
VDD=VIN= CE: Set Output Voltage X 0.95 applied
VOUT: Set Output Voltage X 0.95 applied
VOUT: Set Output Voltage X 0.95 applied
Same as IDD 1, VEXT/ = VOUT - 0.4V
Same as IDD 1, VEXT/ = 0.4V
15 25 35
- 78 -
5.0 10.0 20.0
0.65 -
-
- - 0.20
- 29 43
- 19 27
%
%
mS
V
V
W
W
Measuring Condition: Unless otherwise stated, VDD= 3.3V, IOUT= 130mA
Note 1: EFFI= {[(Output Voltage) X (Output Current)] [(Input Voltage) X (Input Current)]} X100
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet GM3326.PDF ] | |
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