ltc1928 Linear Technology Corporation, ltc1928 Datasheet - Page 4

• Manufacturer Part Number: ltc1928
• Description: Doubler Charge Pump With Low Noise Linear Regulator In Thinsot
• Manufacturer: Linear Technology Corporation

LTC1928-5
TYPICAL PERFOR A CE CHARACTERISTICS
BLOCK DIAGRA
4
260
240
220
200
180
160
140
120
100
2.5
Operating Current vs V
(No Load)
T
A
= 25 C
3.0
V
4.7 F
IN
C
V
IN
IN
3.5
(V)
IN
1
W
4.0
W
19285 G07
CONTROL
SHDN
POR/
U
CP
4.5
5
V
SLEW CONTROL
CHARGE PUMP
REF
SD
0.47 F
= 1.235V
C
AND
FLY
100
CLK B
90
80
70
60
50
40
OSCILLATOR
2.6
Efficiency vs Supply Voltage
550kHz
6
2.8
CN/SHDN
3.0
SUPPLY VOLTAGE (V)
+
–
3.2
3.4 3.6
BURST
ENB
3.8 4.0 4.2
T
I
C
OUT
A
FLY
= 25 C
= 15mA
= 0.47 F
19285 G08
4.4
SD
–
+
+
–
4.901
4.900
4.989
4.988
4.987
4.986
4.985
4.984
4.983
4.982
2
160
GND
0
Output Voltage vs Output Current
4
3
5
19285 BD
CPO
10
OUTPUT CURRENT (mA)
C
4.7 F
C
4.7 F
15
CPO
OUT
V
OUT
20
25
T
V
C
A
IN
FLY
30
= 25 C
= 3V
= 0.47 F
35
19285 G09
40