Voltage Regulators
1
AN8018SA
1.8-volt 2-channel step-up, step-down,
or inverting DC-DC converter control IC
n Overview
The AN8018SA is a two-channel PWM DC-DC con-
verter control IC that features low-voltage operation.
This IC can obtain the step-up, step-down and invert-
ing voltages with a small number of external components.
The minimum operating voltage is as low as 1.8 V so
that it can operate with two dry batteries. In addition,
since it uses the 16-pin surface mounting type package
with 0.65 mm pitch, it is suitable for miniaturized highly
efficient potable power supply.
n Features
• Wide operating supply voltage range (1.8 V to 14 V)
• Incorporating a high precision reference voltage circuit
(allowance: – 2%)
• Control in a wide output frequency range is possible
(20 kHz to 1 MHz).
• Built-in wideband error amplifier (single gain bandwidth
10 MHz typical)
• Built-in timer latch short-circuit protection circuit
(charge current 1.1 m A typical)
• Incorporating the under-voltage lock-out circuit (U.V.L.O.)
(circuit operation-starting voltage 1.67 V typical)
• Dead-time is variable.
• Flatness of switching current can be obtained by staggering the turn-on timing of each channel.
• Built-in unlatch function
When DT1 pin is low level, or DT2 pin is high level, independent turn-off is possible.
• Incorporating a on/off control function
(active-high control input, standby mode current: 5 m A maximum)
• Parallel operation is possible.
• Output block
• Totem pole 1 output
• Output source-current: - 50 mA maximum (Constant current output with a less supply voltage fluctuation is
possible by connecting an external resistor to pin 11)
• Output sink-current: +80 mA maximum
• Open-collector 1 output
• Output current: 50 mA maximum
n Applications
• LCD displays, digital still cameras, and PDAs
Unit: mm
SSOP016-P-0225A
18
0.5– 0.2
(1.0)
0 to 10
16
5.0– 0.2
4.4
–
0.2
6.4
–
0.3
1.2
–
0.2
0.1
–
0.1
9
0.65(0.225)
0.22
+0.10
- 0.05
0
.1
5
+
0.10
-
0.05
Seating plane