Voltage Regulators
AN8049FHN
1.8-volt 3-channel step-up, step-down, and polarity inverting
DC-DC converter control IC
I
Overview
The AN8049FHN is a three-channel PWM DC-DC
converter control IC that features low-voltage operation.
This IC can form a power supply that provides two step-
up outputs and one step-down or polarity inverted output
with a minimal number of external components. Minimal
operating supply voltage of this IC is as low as 1.8 V, so
that it can operate from 2 dry-batteries.
20
5.20
±0.10
(5.00)
19
13
3-
Unit: mm
0
.5
C0
M
ain
Di
sc te
on na
tin nc
ue e/
d
24
R0.30
1
7
(0.77)
8
Ma
int
en
an
•
Electronic equipment that requires a power supply system
ce
I
Applications
/D
isc
on
•
Wide operating supply voltage range: 1.8 V to 14 V
20
12
•
High-precision reference voltage circuit
13 (0.44)
19
0.60
— V
REF
pin voltage:
±1%
0.50
0.20
0.10
— Error amplifier:
±1.5%
QFN024-P-0405A (Lead-free package)
•
Ultrathin surface mounting package for miniaturized
and thinner power supplies
•
Supports control over a wide output frequency range: 20 kHz to 1 MHz
•
On/off (sequence control) pins provided for each channel for easy sequence control setup
•
The negative supply error amplifier supports 0-volt input.
Common-mode input voltage range:
−
0.1 V to V
CC
−1.4
V
This allows the number of external components to be reduced by two resistors.
•
Fixed duty factor: 86%
However, the duty can be adjusted to anywhere from 0% to 100% with an external resistor.
•
Timer latch short-circuit protection circuit (charge current: 1.1
µA
typical)
•
Low input voltage malfunction prevention circuit (U.V.L.O.)
(operation start voltage: 1.67 V typical)
•
Standby function (active-high control input, standby mode current: 1
µA
maximum)
±0.10
±0.06
3.00
±0.10
I
Features
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0.10
4.00
±0.10
(1.10)
(0.77)
7
Seating plane
(0
.1
5)
1
24
8
(0.44)
(1.10)
tin
ue
0.80 max.
M
0.20
±0.10
(4.00)
4.20
±0.10
12
Publication date: December 2001
SDH00011BEB
1
AN8049FHN
I
Block Diagram
CTL1
V
REF
OSC
IN-1
DT1
V
CC
FB1
Off
0.7 V
0.3 V
21
22
5
2
15
14
1.1 mA
1.26 V
(Allowance:
±1%)
50 kΩ
Reference voltage
supply
V
REF
7
Triangular wave generator
6
On/off
control
V
CC
9
10
RB1
OUT1
PWM1
S.C.P.
FB3
18
S.C.P. comp.
0.9 V
DT3
24
3
50 kΩ 50 kΩ
IN+3
17
IN−3
Error
16 amplifier 2
1.26 V
V
REF
1.1 mA
CTL3
Error
amplifier 3
20 kΩ
20 kΩ
1.26 V
1.1 mA
1
2
3
4
5
6
7
8
9
DT2
DT1
ce
/D
Pin No.
Description
isc
I
Pin Descriptions
CTL3
CTL2
CTL1
Off
V
REF
RB2
RB1
Pl
10
11
12
OUT1
OUT2
GND
2
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DT2 1
ty e ty ur
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mi
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30 kΩ
t
30 kΩ
ai
/ on
.
R
S Q
Latch
PWM3
13
V
CC
8
1.26 V
M
ain
Di
sc te
on na
tin nc
ue e/
d
1.26 V
50 kΩ
1.26 V
Error
amplifier 1
20 kΩ
V
CC
23
1.1 mA
U.V.L.O.
OUT3
PWM2
V
REF
RB2
11
OUT2
50 kΩ
50 kΩ
12
19
20
on
tin
ue
CTL2
IN−2
FB2
di
4
1.26 V
GND
Pin No.
13
14
15
16
17
18
19
20
21
22
23
24
Description
OUT3
V
CC
Ma
int
en
an
OSC
IN+3
IN−3
FB3
IN−2
FB2
IN−1
FB1
S.C.P.
DT3
SDH000011BEB
AN8049FHN
I
Absolute Maximum Ratings
Parameter
Supply voltage
Off pin allowable application voltage
Error amplifier input allowable
application voltage
*2
OUT1 and OUT2 pin output
source current
OUT3 pin output current
Power dissipation
*1
Symbol
V
CC
V
OFF
V
IN
I
SO(OUT)
I
SI(OUT)
P
D
T
opr
T
stg
Rating
14.2
14.2
V
CC
−50
+50
111
Unit
V
V
V
mA
mA
mW
°C
°C
Operating temperature
Storage temperature
Note) *1: T
a
=
85°C. For the independent IC without a heat sink.
*2: When V
CC
is less than 6 V, V
IN−1
and V
IN+2
must be V
CC
.
I
Recommended Operating Range
Parameter
Off pin application voltage
OUT1 and OUT2 pin output source current
OUT3 pin output current
Timing resistance
Timing capacitance
Oscillator frequency
Short-circuit protection time-constant setting capacitance
Ma
int
en
an
ce
/D
isc
on
tin
Output current setting resistance
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−55
to
+150
Symbol
V
OFF
Range
0 to 14
Unit
V
I
SO(OUT)
I
SI(OUT)
R
T
C
T
−40
(min.)
40 (max.)
3 to 33
mA
mA
kW
pF
100 to 1 000
20 to 1 000
f
OUT
kHz
pF
Ω
C
SCP
R
B
1 000 (min.)
750 to 15 000
SDH00011BEB
M
ain
Di
sc te
on na
tin nc
ue e/
d
−30
to
+85
ue
3
AN8049FHN
I
Electrical Characteristics at V
CC
=
2.4 V, C
REF
=
0.1
µF,
T
a
=
25°C
Parameter
Reference voltage block
Reference voltage
Line regulation with input fluctuation
Load regulation
V
REF
temperature characteristics
V
REF
pin short-circuit current
U.V.L.O. block
V
REF
Line
Load
V
RFEdT
I
OC
I
REF
= −
0.1 mA
V
CC
=
1.8 V to 14 V
I
REF
= −
0.1 mA to
−1
mA
T
a
= −30°C
to
+85°C
1.247
−20
1.26
2
−3
1
−10
1.273
20
V
mV
mV
%
mA
Symbol
Conditions
Min
Typ
Max
Unit
M
ain
Di
sc te
on na
tin nc
ue e/
d
Circuit operation start voltage
Error amplifier 1 block
V
UON
1.59
Input threshold voltage 1
Input bias current 1
V
TH1
I
B1
V
EH1
V
EL1
1.241
High-level output voltage 1
Low-level output voltage 1
Output source current 1
Output sink current 1
1.0
I
SO(FB)1
I
SI(FB)1
−38
0.5
V
TH
temperature characteristics 1
Open-loop gain 1
Error amplifier 2 block
V
THdT1
A
V1
T
a
= −30°C
to
+85°C
Input threshold voltage 2
Input bias current 2
V
TH2
I
B2
V
EH2
V
EL2
1.241
High-level output voltage 2
Low-level output voltage 2
Output source current 2
Output sink current 2
1.0
1.67
1.75
V
on
I
SO(FB)2
I
SI(FB)2
ce
V
TH
temperature characteristics 2
Error amplifier 3 block
Input offset voltage
V
THdT2
A
V2
Ma
int
en
an
Open-loop gain 2
V
IO
Common-mode input voltage range
Input bias current 3
High-level output voltage 3
Low-level output voltage 3
Output source current 3
Output sink current 3
Open-loop gain 3
V
ICR
I
B3
V
EH3
V
EL3
I
SO(FB)3
I
SI(FB)3
A
V3
4
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1.26
0.1
1.279
0.2
V
µA
V
1.2
1.4
0.2
−31
−24
µA
mA
%
1.5
80
dB
1.26
0.1
1.279
0.2
V
µA
V
1.2
1.4
0.2
−38
0.5
−31
−24
µA
mA
%
T
a
= −30°C
to
+85°C
1.5
80
dB
−6
6
mV
V
−
0.1
−
0.6
1.0
−38
0.5
V
CC
−
1.4
−
0.3
1.2
−31
80
µA
V
µA
mA
dB
1.4
0.2
−24
SDH000011BEB
/D
isc
tin
ue
AN8049FHN
I
Electrical Characteristics at V
CC
=
2.4 V, C
REF
=
0.1
µF,
T
a
=
25°C (continued)
Parameter
Oscillator block
Oscillator frequency
Frequency supply voltage
characteristics
Frequency temperature
characteristics
Output 1 block
f
OUT
f
DV
f
DT
R
T
=
7.5 kΩ, C
T
=
680 pF
R
T
=
7.5 kΩ, C
T
=
680 pF
R
T
=
7.5 kΩ, C
T
=
680 pF
170
190
1
3
210
kHz
%
%
Symbol
Conditions
Min
Typ
Max
Unit
M
ain
Di
sc te
on na
tin nc
ue e/
d
Output duty factor 1
Du
1
R
T
=
7.5 kΩ, C
T
=
680 pF
I
O
= −10
mA, R
B
=
1 kΩ
I
O
=
10 mA, R
B
=
1 kΩ
V
O
=
0.7 V, R
B
=
1 kΩ
80
High-level output voltage 1
Low-level output voltage 1
Output source current 1
Output sink current 1
Pull-down resistor 1
Output 2 block
V
OH1
V
OL1
V
CC
−
1
−32
40
I
SO(OUT)1
V
O
=
0.7 V, R
B
=
1 kΩ
I
SI(OUT)1
R
O1
20
Output duty factor 2
Du
2
R
T
=
7.5 kΩ, C
T
=
680 pF
I
O
= −10
mA, R
B
=
1 kΩ
I
O
=
10 mA, R
B
=
1 kΩ
V
O
=
0.7 V, R
B
=
1 kΩ
80
High-level output voltage 2
Low-level output voltage 2
Output source current 2
Output sink current 2
Pull-down resistor 2
Output 3 block
V
OH2
V
OL2
V
CC
−
1
−32
40
20
I
SO(OUT)2
V
O
=
0.7 V, R
B
=
1 kΩ
I
SI(OUT)2
R
O2
Output duty factor 3
86
92
%
V
ue
Du
3
Short-circuit protection circuit block
isc
on
tin
Output saturation voltage
V
O(SAT)
an
ce
Input threshold voltage
Input latch voltage
Charge current
/D
Input standby voltage
V
STBY
V
THPC
V
IN
I
CHG
Comparator threshold voltage
On/off control block
Input threshold voltage
Off pin current
CTL block
Input threshold voltage
Charge current
Whole device
Average consumption current
Standby mode current
V
THL
V
ON(TH)
I
OFF
V
THCTL
I
CTL
V
CTL
=
0 V
R
B
=
9.1 kΩ, duty
=
50%
I
CC(OFF)
I
CC(SB)
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co L a d t ty
du
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0.2
V
−27
−22
mA
mA
kΩ
30
40
86
92
%
V
0.2
V
−27
30
−22
40
mA
mA
kΩ
R
T
=
7.5 kΩ, C
T
=
680 pF
80
86
92
%
V
0.2
0.1
V
0.8
0.9
1.0
V
0.1
V
V
SCP
=
0 V
−1.3
−1.0
1.26
−0.7
µA
V
0.7
1.0
35
1.3
V
V
OFF
=
5 V
µA
1.07
−1.3
SDH00011BEB
Ma
int
en
1.26
−1.0
1.47
−0.7
V
µA
4.2
5.5
1
mA
µA
5
单片机
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