LM2664M6/NOPB National Semiconductor, LM2664M6/NOPB Datasheet - Page 8

• Manufacturer Part Number: LM2664M6/NOPB
• Description: IC SW CAP/INV ADJ 40MA SOT23-6
• Manufacturer: National Semiconductor
• Type: Switched Capacitor (Charge Pump), Invertingr

Specifications of LM2664M6/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: -1.8 ~ -5.5 V
• Current - Output: 40mA
• Frequency - Switching: 160kHz
• Voltage - Input: 1.8 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Power - Output: 600mW
• Primary Input Voltage: 5V
• No. Of Outputs: 1
• Output Voltage: -5.5V
• Output Current: 40mA
• No. Of Pins: 6
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM2664M6; LM2664M6TR

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Other Applications
REGULATING V
It is possible to regulate the negative output of the LM2664
by use of a low dropout regulator (such as LP2980). The
whole converter is depicted in Figure 6. This converter can
give a regulated output from −1.8V to −5.5V by choosing the
proper resistor ratio:
OUT
FIGURE 6. Combining LM2664 with LP2980 to Make a Negative Adjustable Regulator
V
where, V
out
= V
ref
ref
(1 + R
= 1.23V
(Continued)
1
FIGURE 5. Combined Voltage Doubler and Inverter
/R
2
)
8
Note that, the following conditions must be satisfied simulta-
neously for worst case design:
V
V
in_max
in_min
+ I
+ I
out_max
out_min
<
>
V
V
out_min
out_max
x R
x R
out_max
out_min
+V
+V
drop_max
drop_min
10003112
(LM2664)
(LM2664)
10003124
(LP2980)
(LP2980)