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參數(shù)資料
| 型號(hào)： | GM3326-5.5ST25R |
| 廠商： | American Power Management Inc. |
| 英文描述： | PWM,PWM/PFM SWITCHING STEP-UP & DOWN DC/DC CONVERTER CONTROLLER ICS |
| 中文描述： | 脈寬調(diào)制，脈寬調(diào)制/ PFM切換升壓 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 111K |
| 代理商： | GM3326-5.5ST25R |
G
M
3
2
6
5
ELECTRICAL CHARACTERISTICS (GM3326- 3.3V)
Min
Typ
Max
Unit
PARAMETER
CONDITIONS
Min
V
= 3.3V, F
= 300kHz
OUT
OSC
T = 25°C
A
SYMBOL
Output Voltage
Supply Voltage
Supply Current 1
Supply Current 2
Stand- By Current
Oscillation Frequency
Max. Duty Ratio
PFM Duty Ratio
Efficiency
Note 1
Soft- Start Time
CE 'H' Voltage
CE 'L' Voltage
EXT/ 'H' ON Resistance
EXT/ 'L' ON Resistance
VOUT
VDD
IDD 1
IDD 2
ISTB
FOSC
MAXDTY
PFMDTY
EFFI
TSS
VCEH
VCEL
REXTBH
REXTBL
3.218
2.0
-
255
78
15
-
5.0
0.65
-
3.300
-
130
20
-
300
85
25
78
10.0
-
29
19
3.383
10.0
200
35
0.5
345
92
35
-
20.0
-
0.20
43
27
V
A
KHz
%
mS
V
W
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=V
= CE: Set Output Voltage X 0.95 applied
OUT
VDD=V
= CE: Set Output Voltage X 0.95 applied
OUT
No load
VDD=V = CE: Set Output Voltage X 0.95 applied
IN
V
: Set Output Voltage X 0.95 applied
OUT
V
: Set Output Voltage X 0.95 applied
OUT
Same as I
1, V
/ = V
- 0.4V
DD
EXT
OUT
Same as I
1, V
/ = 0.4V
DD
EXT
Measuring Condition: Unless otherwise stated, V
= 3.3V, I
= 130mA
DD
OUT
Note 1: EFFI= {[(Output Voltage) X (Output Current)]
[(Input Voltage) X (Input Current)]} X100
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 V
via Pch MOSEFT, L, Nch FET to GND : L is charged.
IN
[OFF TIME]
P-Ch MOSFET (PSW) = OFF, N-Ch MOSFET (NSW) = OFF : Current flows from GND via Schottky 1, L, Schottky 2, to
V
: V
rises due to the charge stored at L. By comparing V
with the internal reference voltage, the ON TIME vs
OUT
OFF TIME ratio can be regulated & output stability can be protected.
OPERATIONAL EXPLANATION
CIN
+
CL
VOUT
VIN
L
Schottky
Nch
MOSFET
CE
Pch MOSFET
VOUT EXT
CE
GND
VIN
<Circuit Connection Example>
Schottky
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