Voltage Regulators
AN8049SH
1.8-volt 3-channel step-up, step-down, and polarity inverting
DC-DC converter control IC
Unit : mm
M
ain
Di
sc te
on na
tin nc
ue e/
d
12
I
Features
•
Wide operating supply voltage range: 1.8 V to 14 V
•
High-precision reference voltage circuit
SSOP024-P-0300A
— V
REF
pin voltage:
±1%
Note) The package of this product will be changed
— Error amplifier:
±1.5%
to lead-free type (SSOP024-P-0300D). See the
•
Surface mounting package for miniaturized and thinner
new package dimensions section later of this
power supplies
•
Supports control over a wide output frequency range: 20 kHz to 1 MHz
datasheet.
•
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)
•
Alternate package versions also available.
Part No.: AN8049FHN
Package: QFN024-P-0405A (Lead-free package)
0.5-mm lead pitch
Width
5.20 mm
±
0.10 mm
Depth
4.20 mm
±
0.10 mm
Thickness 0.8 mm (max.)
I
Applications
•
Electronic equipment that requires a power supply system
d
pla inc
Pl
ea
ne lud
se
pla m d m es
ne ain ain foll
htt visit
d d te te ow
p:/ fo
/w llo dis isc nan nan ing
ww wi co on ce c fo
.se ng ntin tin ty e ty ur
mi UR ue ued pe pe Pro
co L a d t ty
du
n.p bo yp pe
ct
e
life
an ut
d
as lat
cy
on es
cle
ic. t in
sta
co fo
ge
.jp rm
.
/en at
/ ion
.
0.1±0.1
(0.5)
5.5±0.3
7.5±0.3
Ma
int
en
an
ce
/D
isc
on
tin
ue
0.65±0.1
0.15
+0.1
-0.05
1.5±0.2
The AN8049SH 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. The
AN8049SH features the ability to operate from a supply
voltage as low as 1.8 V, and thus can be operated from
two dry-batteries.
1
24
0.5
I
Overview
13
0.2±0.1
0.65±0.1
6.5±0.3
Publication date: December 2001
SDH00012BEB
1
AN8049SH
CTL1
I
Block Diagram
IN-1
FB1
V
REF
OSC
DT1
V
CC
23
24
7
4
17
16
1.1
µA
1.26 V
(Allowance:
±1%)
Error
amplifier 1
20 kΩ
1.26 V
45 kΩ
Reference voltage
supply V
REF
9
Sawtooth wave generator
0.7 V
V
0.3 V On/off
CC
control
11
55 kΩ
8
Off
RB1
OUT1
M
ain
Di
sc te
on na
tin nc
ue e/
d
1.26 V
V
CC
12
S.C.P.
FB3
20
S.C.P. comp.
DT3
2
5
56 kΩ 44 kΩ
18
IN+3
19
IN−3
Error
amplifier 2
R
Q
S
Latch
1.26 V
0.9 V
V
REF
1.1
µA
CTL3
Error
amplifier 3
20 kΩ
20 kΩ
1.26 V
1.1
µA
isc
1
S.C.P.
ce
Connection for the capacitor that
provides the short-circuit protection
circuit time constant
on
Pin No.
Symbol
Description
tin
ue
I
Pin Descriptions
Ma
int
en
2
3
4
5
6
7
8
9
10
11
DT3
DT2
DT1
Channel 3 soft start setting
Channel 2 soft start setting
Channel 1 soft start setting
CTL3
CTL2
CTL1
Off
V
REF
RB2
RB1
Channel 3 on/off control
Channel 2 on/off control
Channel 1 on/off control
On/off control
Reference voltage output
Connection for the OUT2 block
output source current setting resistor
Connection for the OUT1 block
output source current setting resistor
2
d i
CTL2 6
pla nc
Pl
ea
ne lud
se
pla m d m es
ne ain ain foll
htt visit
d d te te ow
p:/ fo
/w llo dis isc nan nan ing
ww wi co on ce c fo
.se ng ntin tin
3
ty e ty ur
ue
mi UR ue
DT2
d pe pe Pro
co L a d t ty
du
n.p bo yp pe
ct
e
life
an ut
d
as lat
cy
on es
cle
ic. t in
sta
co fo
ge
.jp rm
.
27 kΩ
/en
27
t
kΩ
ai
/ on
.
PWM3
1
1.1
µA
U.V.L.O.
PWM1
15
OUT3
V
CC
10
13
PWM2
RB2
1.26 V
OUT2
V
REF
45 kΩ
55 kΩ
14
21
IN−2
FB2
22
1.26 V
GND
Pin No.
12
13
14
Symbol
OUT1
OUT2
GND
Description
OUT1 block push-pull output
OUT2 block push-pull output
/D
an
Ground
15
16
OUT3
V
CC
OSC
OUT3 block open-collector output
Supply voltage
17
Oscillator circuit timing resistor and
capacitor connection
Error amplifier 3 noninverting input
Error amplifier 3 inverting input
18
19
20
21
22
23
24
IN+3
IN−3
FB3
IN−2
FB2
IN−1
FB1
Error amplifier 3 output
Error amplifier 2 inverting input
Error amplifier 2 output
Error amplifier 1 inverting input
Error amplifier 1 output
SDH00012BEB
AN8049SH
I
Absolute Maximum Ratings
Parameter
Supply voltage
Off pin allowable application voltage
CTL pin allowable application voltage
Error amplifier input pin
allowable application voltage
*2
Supply current
Symbol
V
CC
V
OFF
V
CTL
V
IN
I
CC
Rating
14.2
14.2
V
CC
−
0.2
6
Unit
V
V
V
V
mA
mA
OUT3 pin output current
Power dissipation
*1
Operating temperature
Storage temperature
Note) 1. Do not apply external currents or voltages to any pins not specifically mentioned. For circuit currents, '+' denotes current
flowing into the IC, and '−' denotes current flowing out of the IC.
2. Items other than the storage temperature, operating temperature, and power dissipation are all stipulated for an ambient
temperature T
a
=
25°C.
3. *1: T
a
=
85°C. See the "Application Notes" for details on the relationship between IC power dissipation and the ambient
temperature.
*2: When V
CC
<
6 V, the following condition must hold: V
IN−1
=
V
IN−2
=
V
CC
−
0.2 V.
I
Recommended Operating Range
Parameter
Off pin application voltage
Timing capacitance
/D
isc
Timing resistance
on
OUT3 pin output current
tin
ue
OUT1 and OUT2 pin output source current
Short-circuit protection time-constant setting capacitance
Output current setting resistance
Ma
int
en
an
Oscillator frequency
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
U.V.L.O. block
Circuit operation start voltage
V
UON
SDH00012BEB
Symbol
V
REF
Line
Load
d
pla inc
Pl
ea
ne lud
se
pla m d m es
ne ain ain foll
htt visit
d d te te ow
p:/ fo
/w llo dis isc nan nan ing
ww wi co on ce c fo
.se ng ntin tin ty e ty ur
mi UR ue ued pe pe Pro
co L a d t ty
du
n.p bo yp pe
ct
e
life
an ut
d
as lat
cy
on es
cle
ic. t in
sta
co fo
ge
.jp rm
.
/en at
/ ion
.
I
O
+50
146
mA
°C
P
D
mW
°C
T
opr
T
stg
−30
to
+85
−55
to
+125
Symbol
V
OFF
Range
0 to 14
Unit
V
I
SO(OUT)
I
O
R
T
C
T
−40
to
−1
3 to 33
mA
40 (max.)
kΩ
pF
100 to 10 000
20 to 1 000
f
OUT
kHz
pF
Ω
C
SCP
R
B
1 000 (min.)
750 to 15 000
Conditions
I
REF
= −
0.1 mA
V
CC
=
1.8 V to 14 V
I
REF
= −
0.1 mA to
−1
mA
Min
Typ
Max
Unit
1.247
−20
1.26
2
−3
1.273
20
V
mV
mV
1.59
1.67
1.75
V
ce
M
ain
Di
sc te
on na
tin nc
ue e/
d
OUT1 and OUT2 pin output
source current
I
SO(OUT)
−50
3
AN8049SH
I
Electrical Characteristics at V
CC
=
2.4 V, C
REF
=
0.1
µF,
T
a
=
25°C (continued)
Parameter
Error amplifier 1 block
Input threshold voltage 1
Input bias current 1
High-level output voltage 1
Low-level output voltage 1
Output source current 1
Output sink current 1
V
TH1
I
B1
V
EH1
V
EL1
I
SO(FB)1
I
SI(FB)1
V
TH2
I
B2
1.241
1.0
−38
0.5
1.26
0.1
1.2
−31
1.26
0.1
1.279
0.2
1.4
0.2
−24
1.279
0.2
V
µA
V
V
µA
mA
Symbol
Conditions
Min
Typ
Max
Unit
Input threshold voltage 2
Input bias current 2
High-level output voltage 2
Low-level output voltage 2
Output source current 2
Output sink current 2
V
EH2
V
EL2
I
SO(FB)2
I
SI(FB)2
Error amplifier 3 block
Input offset voltage
V
IO
I
B3
Common-mode input voltage range
Input bias current 3
V
ICR
High-level output voltage 3
Low-level output voltage 3
Output source current 3
Output sink current 3
Oscillator block
V
EH3
V
EL3
I
SO(FB)3
I
SI(FB)3
f
OUT
Output 1 block
ce
/D
isc
Oscillator frequency
an
Output duty factor 1
Du
1
High-level output voltage 1
Low-level output voltage 1
Output source current 1
Output sink current 3
Pull-down resistor 1
Output 2 block
Output duty factor 2
High-level output voltage 2
Low-level output voltage 2
Output source current 2
Output sink current 2
4
V
OH1
V
OL1
I
SO(OUT)1
V
O
=
0.7 V, R
B
=
1 kΩ
I
SI(OUT)1
R
O1
Du
2
V
OH2
V
OL2
I
SO(OUT)2
V
O
=
0.7 V, R
B
=
1 kΩ
I
SI(OUT)2
V
O
=
0.7 V, R
B
=
1 kΩ
SDH00012BEB
d
pla inc
Pl
ea
ne lud
se
pla m d m es
ne ain ain foll
htt visit
d d te te ow
p:/ fo
/w llo dis isc nan nan ing
ww wi co on ce c fo
.se ng ntin tin ty e ty ur
mi UR ue ued pe pe Pro
co L a d t ty
du
n.p bo yp pe
ct
e
life
an ut
d
as lat
cy
on es
cle
ic. t in
sta
co fo
ge
.jp rm
.
/en at
/ ion
.
1.241
V
µA
V
V
1.0
1.2
1.4
0.2
−38
0.5
−6
−31
−24
µA
mA
6
mV
V
µA
V
−
0.1
−
0.6
1.0
V
CC
−
1.4
−
0.3
1.2
1.4
0.2
V
−38
0.5
−31
−24
µA
mA
R
T
=
7.5 kΩ, C
T
=
680 pF
170
190
210
kHz
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
86
92
%
V
V
CC
−1
−34
40
0.2
V
−29
−24
mA
mA
kΩ
17
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
27
37
80
V
CC
−1
−34
40
86
−29
92
0.2
−24
%
V
V
mA
mA
Ma
int
en
M
ain
Di
sc te
on na
tin nc
ue e/
d
Error amplifier 2 block
on
tin
ue
AN8049SH
I
Electrical Characteristics at V
CC
=
2.4 V, C
REF
=
0.1
µF,
T
a
=
25°C (continued)
Parameter
Output 2 block (continued)
Pull-down resistor 2
Output 3 block
Output duty factor 3
Output saturation voltage
Output leakage current
Du
3
V
O(SAT)
I
OLE
R
T
=
7.5 kΩ, C
T
=
680 pF
I
O
=
40 mA
V13
=
14 V
80
86
92
0.5
1
%
V
µA
R
O2
17
27
37
kΩ
Symbol
Conditions
Min
Typ
Max
Unit
M
ain
Di
sc te
on na
tin nc
ue e/
d
Short-circuit protection circuit block
Input standby voltage
V
STBY
Input threshold voltage
Input latch voltage
Charge current
V
THPC
V
IN
0.8
I
CHG
V
SCP
=
0 V
−1.43
On/off control block
Input threshold voltage
CTL block
V
ON(TH)
V
THCTL
I
CTL
0.6
Input threshold voltage
Charge current
1.07
V
CTL
=
0 V
−1.43
Whole Device
Average consumption current
Standby mode current
I
CC(OFF)
I
CC(SB)
R
B
=
9.1 kΩ, duty
=
50%
•
Design reference data
Parameter
Symbol
0.1
1.0
V
V
Note: The characteristics listed below are reference values related to the IC design and are not guaranteed.
on
Reference voltage block
V
REF
temperature characteristics
V
RFEdT
ce
Error amplifier 1 block
V
TH
temperature characteristics
V
THdT1
A
V1
Open loop gain 1
Error amplifier 2 block
V
TH
temperature variation
Open loop gain 2
Error amplifier 3 block
Open loop gain 3
Oscillator block
Frequency supply voltage
characteristics
Frequency temperature
characteristics
V
THdT2
A
V2
A
V3
f
DV
f
DT
V
CC
=
1.8 V to 14 V
R
T
=
7.5 kΩ, C
T
=
680 pF
T
a
= −30°C
to
+85°C
R
T
=
7.5 kΩ, C
T
=
680 pF
d
pla inc
Pl
ea
ne lud
se
pla m d m es
ne ain ain foll
htt visit
d d te te ow
p:/ fo
/w llo dis isc nan nan ing
ww wi co on ce c fo
.se ng ntin tin ty e ty ur
mi UR ue ued pe pe Pro
co L a d t ty
du
n.p bo yp pe
ct
e
life
an ut
d
as lat
cy
on es
cle
ic. t in
sta
co fo
ge
.jp rm
.
/en at
/ ion
.
0.9
0.1
V
−1.1 −
0.77
µA
0.9
1.2
V
1.26
1.45
V
−1.1 −
0.77
4.2
5.5
1
µA
mA
µA
Conditions
Min
Typ
Max
Unit
T
a
= −30°C
to
+85°C
T
a
= −30°C
to
+85°C
1
%
1.5
80
%
dB
1.5
80
%
dB
80
dB
1
3
%
%
SDH00012BEB
Ma
int
en
an
/D
isc
tin
ue
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
