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Voltage Regulators
1
AN8011S
2-channel step-down, step-up, or inverting use
DC-DC converter control IC
s
Overview
The AN8011S is a DC-DC converter control IC
with two-channel output using the PWM method
which allows 500 kHz high-speed control.
Respecitve output operation can be completely
synchronized with each other by using the same
oscillation output.
s
Features
PWM control frequency of 500 kHz is available.
Wide operating supply voltage range
(V
CC
=
3.6 V to 34 V)
Built-in 2-channel of open collector type for out-
put (A single-channel is also usable for inverted
amplification type)
Each output can be stopped independently by the
external control .
Built-in on/off function for the operation/stop of IC Incorporating circuit for short-circuit portection and under-
voltage lock-out (U.V.L.O.)
The latch circuit is externally controllable.
Low consumption current (during operation: 5 mA, during standby: 2 A)
s
Applications
LCD displays, digital still cameras, and PDAs
s
Block Diagram
Unit: mm
SOP016-P-0225A
0.3
(0
to 10
)
(0.15)
10.10.3
4.20.3
6.50.3
1
8
16
9
1.27
(0.605)
Seating plane
Seating plane
0.400.25
0.10.1
1.50.2
V
REF
V
CC
Out1
DTC1
FB1
IN
-
1
IN
+
Latch
U.V.L.O.
OSC
Latch
On/
Off
Unlatch pro.
Unlatch pro.
Short pro.
Error amp.
Error amp.
PWM1
PWM2
16
15
14
13
12
11
10
9
V
REF
1
CT
2
3
RT
On/Off
4
IN
-
2
FB2
5
6
DTC2
7
Out2
8
GND
2
AN8011S
Voltage Regulators
s
Pin Descriptions
Pin No.
Symbol
Description
1
CT
Pin for connecting the oscillation frequency setting capacitor for triangular oscillation
circuit. Frequecy of triangular oscillation is set by connecting a capacitor between this
terminal and GND.
2
RT
Resistor connection pin for setting the oscillation frequency of triangular oscillation
circuit. Frequecy of triangular oscillation is set by connecting resistance between the
pin and GND
3
On/Off
"On/Off" pin for turning on/off IC. "Low" stops IC (output off) and "High" operates IC.
4
IN
-
2
Inverted input pin for channel 2 error amplifier
5
F/B 2
Output pin for channel 2 error amplifier. Gain setting or phase compensation is per-
formed by connecting resistor or capacitor between the pin and IN
-
2. It is also connected
to PWM short-circuit protecion.
6
DTC 2
Pin for setting dead-time period of channel 2. The dead-time of channel 2 is set by
connecting external resistor. Soft start function can be also given by connecting capaci-
tor in parallel with the external resistor. In addition, only channel 2 output can be turned
off by decreasing the pin voltage to below 0.12 V. (short-circuit protection function stop
circuit)
7
Out 2
Channel 2 open-collector type output pin. I
O
=
100 mA maximum
8
GND
Grounding pin of signal system.
9
V
CC
Power supply voltage application pin. It detects start voltage and stop voltages
10
Out 1
Channel 1 open-collector type output pin. I
O
=
100 mA maximum
11
DTC 1
Pin for setting dead-time period of channel 1. The dead-time period of channel 1 is set
by connecting external resistor. Soft start function can be also given by connecting capacitor
in parallel with the external resistor. In addition, only channel 1 output can be turned off
by decreasing the pin voltage to below 0.12 V. (short-circuit protection function stop
circuit)
12
F/B 1
Output pin for channel 1 error amplifier. Gain setting or phase compensation is per
formed by connecting resistor or capacitor between the pin and IN
-
1. It is also con
nected to PWM short-circuit protection.
13
IN
-
1
Inverted input pin for channel 1 error amplifier.
14
IN
+
Pin for noninverted input of channel 1error amplifier.
15
Latch
Pin for connecting the time constant setting capacitor for timer latch type short-circuit
protection circuit. The time constant for short-circuit protection is set by connecting
a capacitor between this terminal and GND.
16
V
REF
Internal reference voltage output pin (2.5 V(allowance:
3%)). If a load of 20 mA typical
or more is applied, the overcurrent protection operates to reduce V
REF
and switching
operation stops.
3
Voltage Regulators
AN8011S
s
Recommended Operating Range
Parameter
Symbol
Range
Unit
Supply voltage
V
CC
3.6 to 34
V
Parameter
Symbol
Rating
Unit
Supply voltage
V
CC
35
V
Power dissipation
*
P
D
380
mW
Operating ambient temperature
T
opr
-
30 to
+
85
C
Storage temperature
T
stg
-
40 to
+
125
C
s
Absolute Maximum Ratings at T
a
=
25
C
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Reference voltage block
Output voltage
V
REF
2.413
2.5
2.588
V
Input regulation with input fluctuation
Line
V
CC
=
3.6 V to 34 V
3
20
mV
Load regulation
Load
I
REF
=
0 mA to 5 mA
2
10
mV
Output voltage temperature
V
TC1
T
a
= -
25
C to
+
25
C
1
%
characteristics 1
*
Output voltage temperature
V
TC2
T
a
=
25
C to
85
C
1
%
characteristics 2
*
Overcurrent protection drive current
*
I
CC
-
20
mA
U.V.L.O. block
Circuit operation start voltage
V
UON
2.8
3.1
3.4
V
Hysteresis width
V
HYS
100
200
300
mV
Error amplifier block 1
Input offset voltage 1
V
IN-O1
-
6
6
mV
Input current 1
I
B1
-
500
-
25
100
nA
Common-mode input voltage range
V
CM
0.5
0.8
V
High-level output voltage 1
V
EH1
V
REF
-
0.3
V
Low-level output voltage 1
V
EL1
0.5
V
Error amplifier block 2
Input current 2
I
B2
25
100
nA
Common mode input threshold voltage
V
IN
+
0.72
0.75
0.78
V
High-level output voltage 2
V
EH2
V
REF
-
0.3
V
Low-level output voltage 2
V
EL2
0.5
V
s
Electrical Characteristics at V
CC
=
12 V, T
a
=
25
C
Note) 1. Do not apply ecternal currents or voltages to any pins not speifically mentioned.
For circuit currents, '
+
' denotes current flowing into the IC, and '
-
' denotes current flowing out of the IC.
2 *: When using the IC at T
a
of 25
C or more, the power dessipation should be decreased 3.8 mW per 1
C.
4
AN8011S
Voltage Regulators
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
PWM comparator 1/2 block
High-level input threshold voltage
V
DT-H
f
OSC
=
200 kHz, duty
=
100%
1.2
V
Low-level input threshold voltage
V
DT-L
f
OSC
=
200 kHz, duty
=
100%
0.6
V
Input current
I
DTC
R
T
=
20 k
-
37
-
34
-
31
A
Output 1/2 block
Output frequency 1
f
OUT1
C
T
=
150 pF, R
T
=
20 k
, I
O
=
30 mA
180
200
220
kHz
Frequency 1
f
dv
V
CC
=
3.6 V to 34 V
-
2
2
%
C
T
=
150 pF, R
T
=
20 k
Output duty ratio 1
Du
1
C
T
=
150 pF, R
T
=
20 k
, R
DTC
=
24 k
40
45
50
%
Output duty ratio 2
Du
2
C
T
=
150 pF, R
T
=
20 k
, R
DTC
=
33 k
65
75
85
%
Output saturation voltage 1
V
O(sat)1
I
O
=
30 mA
0.9
V
Output saturation voltage 2
V
O(sat)2
I
O
=
100 mA
1.2
V
Output leak current 1
I
OLe1
V
CC
=
34 V, when output
10
A
transistor is off
Frequency temperature characteristics 1
*
f
dT1
f
OSC
=
200 kHz, T
a
= -
30
C to
+
25
C
9
%
Frequency temperature characteristics 2
*
f
dT2
f
OSC
=
200 kHz, T
a
=
25
C to
85
C
9
%
Output frequency 2
*
f
OUT2
C
T
=
150 pF, R
T
=
6.6 k
, I
O
=
30 mA
500
kHz
Frequency 2
*
f
dv2
V
CC
=
3.6V to 34V,
2
%
C
T
=
150 pF, R
T
=
6.6 k
Short-circuit protection block
Input threshold voltage
V
SLTH
1.75
1.85
1.95
V
Latch drive voltage
V
SLON
1.15
1.25
1.35
V
Charge current
I
CHG
-
120
-
50
-
40
A
Unlatch pro. 1/2 block
Input threshold voltage
V
ULTH
0.12
V
On/off block
Threshold voltage
V
TH
0.8
2
V
Whole device
Total consumption current
I
CC
V
CC
=
12 V, R
T
=
20 k
5
7
mA
Total consumption current fluctuation
I
CC(max.)
V
CC
=
3.6 V to 34 V, R
T
=
20 k
2
mA
Standby consumption current
I
CC(SB)
V
CC
=
12 V, V
REF
is down
2
A
Maximum standby consumption current I
CC(SB-M)
V
CC
=
34 V, V
REF
is down
5
A
s
Electrical Characteristics(continued) at V
CC
=
12 V, T
a
=
25
C
Note) *: These characteristics are theoretical values based on the IC design and are not guaranteed.
5
Voltage Regulators
AN8011S
Pin No.
Equivalent circuit
Description
I/O
1
CT:
O
The terminal used for connecting a timing
capacitor to set oscillator frequency. Use a
capacitance value within the range of 100 pF
to 0.1mF. For frequency setting method, re-
fer to the "Application Notes, [2] Function
descriptions" section. Use the oscillation fre-
quency in the range of 1 kHz to 500 kHz.
2
RT:
I
The terminal used for connecting a timing
resistor to set oscillattion frequency.
Use a resistance value ranging from 5.1 k
to 20 k
.
The terminal voltage is 0.67 V typ.
3
On/Off:
I
The terminal for on/off control.
High-level input: normal operation
(V
ON/OFF
>
2.0 V typ.)
Low-level input: standby state
(V
ON/OFF
<
0.8 V typ.)
The total current consumption in the standby
state can be suppressed to a value below 5
A.
4
IN
-
2:
I
The terminal for the inverted input of ch.2
error amplifier. Use a common-mode input
ranging from
-
0.1 V to 0.8 V.
s
Terminal Equivalent Circuits
OSC
comp.
To PWM input
V
REF
CT
I
O
2I
O
1
16
2
OSC
PWM
RT (
=
0.67 V)
V
REF
16
17 k
Internal
circuit start/stop
13 k
3
On/Off
4
0.75 V
IN
-
2
V
REF
16
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