Datasheet

4
LTC1261
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Maximum Output Current
vs Supply Voltage
Supply Current
vs Supply Voltage
Output Voltage
vs Output Current
Output Voltage (Doubler Mode)
vs Supply Voltage
Output Voltage (Tripler Mode)
vs Supply Voltage
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE (V)
–3.9
–3.7
–3.5
–3.6
–3.8
–4.0
–4.2
–4.4
8
LT1261 • TP01
–4.1
–4.3
–4.5
213579
4
6
10
V
CC
= 5V
DOUBLER MODE
V
CC
= 3.3V
TRIPLER MODE
T
A
= 25°C
SUPPLY VOLTAGE (V)
5.0
OUTPUT VOLTAGE (V)
–3.9
–3.7
–3.5
–3.6
–3.8
–4.0
–4.2
–4.4
6.6
LT1261 • TP02
–4.1
–4.3
–4.5
5.45.2 5.6 6.0 6.4 6.8
5.8
6.2
7.0
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
SUPPLY VOLTAGE (V)
3
–4.5
–4.4
–4.3
–4.2
–4.1
–4.0
–3.9
–3.8
–3.7
–3.6
–3.5
OUTPUT VOLTAGE (V)
4
5

LTC1261 • TPC03

6

7
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
Supply Current
vs Temperature
SUPPLY VOLTAGE (V)
3.0
10
MAXIMUM OUTPUT CURRENT (mA)
20
30
40
50
3.5 4.0 4.5 5.0
LTC1261 • TPC04
5.5 6.0 6.5 7.0
V
OUT
= –4V ±5%
T
A
= 25°C
TRIPLER MODE
DOUBLER MODE
SUPPLY VOLTAGE (V)
500
1000
600
800
SUPPLY CURRENT (µA)
700
900
1200
3.5 4.5 5.5 6.5
LTC1261 • TPC05
7.5 8.03.0 4.0 5.0 6.0 7.0
V
OUT
= –4V
T
A
= 25°C
TRIPLER MODE
DOUBLER MODE
TEMPERATURE (˚C)
–40
SUPPLY CURRENT (µA)
900
1000
1200
20 60
LTC1261 • TPC06
800
700
–20 0
40 80 100
600
500
V
OUT
= –4V
V
CC
= 5V
DOUBLER MODE
V
CC
= 3.3V
TRIPLER MODE
(See Test Circuits)
Doubler Mode
1
2
3
4
8
7
6
5

LTC1261-4
SHDN
REG
OUT
COMP
V
CC

C1
+

C1
–

GND
0.1µF
LTC1261 • TCO1
3.3µF
V
OUT
= –4V ±5%
5V
10µF
+
+
2
3
4
5

10
9
8
7
11
ADJ
R
ADJ

R1
R0
OUT
C1
+

C1
–

C2
+

C2
–

0.1µF
LTC1261 • TC02
6
14
0.1µF
10µF
LTC1261CS
V
IN
= 3.3V
V
CC
GND
3.3µF
V
OUT
= –4V ±5%
+
+
TEST CIRCUITS

Tripler Mode