Voltage Regulators
1
AN8049SH
1.8-volt 3-channel step-up, step-down, and polarity inverting
DC-DC converter control IC
s
Overview
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.
s
Features
Wide operating supply voltage range: 1.8 V to 14 V
High-precision reference voltage circuit
-- V
REF
pin voltage:
1%
-- Error amplifier:
1.5%
Surface mounting package for miniaturized and thinner power supplies
Package: SSOP-24D
0.5-mm lead pitch
7.8 mm
6.8 mm
t 1.9 mm
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
A 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
A maximum)
Alternate package versions also available.
Part No.: AN8049FHN
Package: QFN-24
0.5-mm lead pitch
5.4 mm
4.4 mm
t 0.8 mm
s
Applications
Electronic equipment that requires a power supply system
SSOP024-P-0300A
Unit : mm
6.50.3
1
12
24
13
5.50.3
7.50.3
0.50
(0.50)
Seating plane
Seating plane
0.20.1
0.650.10
0.650.10
1.50.2
0.10.1
(0.50)
0
to 10
0.15
+0.10
0.05
AN8049SH
Voltage Regulators
2
s
Block Diagram
IN-1
23
FB1
24
CTL1
7
V
CC
16
DT1
4
V
REF
9
OSC
17
Of
f
8
20 k
1.1
A
1.26 V
CTL3
DT3
IN
-
3
19
IN
+
3
FB3
20
S.C.P.
RB1
OUT1
OUT3
RB2
OUT2
GND
1
18
5
2
IN
-
2
21
FB2
22
1.26 V
Error
amplifier 3
CTL2
DT2
6
3
1.26 V
1.26 V
1.1
A
1.1
A
1.1
A
0.9 V
Error
amplifier 1
Error
amplifier 2
44 k
56 k
V
REF
V
CC
45 k
55 k
V
CC
On/off
control
Reference voltage
supply
V
REF
Sawtooth wave generator
0.7 V
0.3 V
1.26 V
(Allowance:
1%)
S.C.P. comp.
Latch
U.V.L.O.
R
S
Q
1.26 V
1.26 V
20 k
20 k
PWM2
PWM3
PWM1
V
REF
45 k
27 k
27 k
55 k
11
12
V
CC
13
10
15
14
s
Pin Descriptions
Pin No.
Symbol
Description
12
OUT1
OUT1 block push-pull output
13
OUT2
OUT2 block push-pull output
14
GND
Ground
15
OUT3
OUT3 block open-collector output
16
V
CC
Supply voltage
17
OSC
Oscillator circuit timing resistor and
capacitor connection
18
IN
+
3
Error amplifier 3 noninverting input
19
IN
-
3
Error amplifier 3 inverting input
20
FB3
Error amplifier 3 output
21
IN
-
2
Error amplifier 2 inverting input
22
FB2
Error amplifier 2 output
23
IN
-
1
Error amplifier 1 inverting input
24
FB1
Error amplifier 1 output
Pin No.
Symbol
Description
1
S.C.P.
Connection for the capacitor
that provides the short-
circuit protection circuit time
constant
2
DT3
Channel 3 soft start setting
3
DT2
Channel 2 soft start setting
4
DT1
Channel 1 soft start setting
5
CTL3
Channel 3 on/off control
6
CTL2
Channel 2 on/off control
7
CTL1
Channel 1 on/off control
8
Off
On/off control
9
V
REF
Reference voltage output
10
RB2
Connection for the OUT2
block output source current
setting resistor
11
RB1
Connection for the OUT1
block output source current
setting resistor
Voltage Regulators
AN8049SH
3
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
=
85C. 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.
s
Absolute Maximum Ratings
Parameter
Symbol
Rating
Unit
Supply voltage
V
CC
14.2
V
Off pin allowable application
V
OFF
14.2
V
voltage
CTL pin allowable application
V
CTL
V
CC
-
0.2
V
voltage
Error amplifier input pin
V
IN
6
V
allowable application voltage
*2
Supply current
I
CC
mA
OUT1 and OUT2 pin output
I
SO(OUT)
-
50
mA
source current
OUT3 pin output current
I
O
+
50
mA
Power dissipation
*1
P
D
146
mW
Operating temperature
T
opr
-
30 to
+
85
C
Storage temperature
T
stg
-
55 to
+
125
C
s
Recommended Operating Range
Parameter
Symbol
Range
Unit
Off pin application voltage
V
OFF
0 to 14
V
OUT1 and OUT2 pin output source current
I
SO(OUT)
-
40 to
-
1
mA
OUT3 pin output current
I
O
40 (max.)
Timing resistance
R
T
3 to 33
k
Timing capacitance
C
T
100 to 10 000
pF
Oscillator frequency
f
OUT
20 to 1 000
kHz
Short-circuit protection time-constant setting capacitance
C
SCP
1 000 (min.)
pF
Output current setting resistance
R
B
750 to 15 000
AN8049SH
Voltage Regulators
4
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Reference voltage block
Reference voltage
V
REF
I
REF
=
-
0.1 mA
1.247
1.26
1.273
V
Line regulation with input fluctuation
Line
V
CC
=
1.8 V to 14 V
2
20
mV
Load regulation
Load
I
REF
=
-
0.1 mA to
-
1 mA
-
20
-
3
mV
U.V.L.O. block
Circuit operation start voltage
V
UON
1.59
1.67
1.75
V
Error amplifier 1 block
Input threshold voltage 1
V
TH1
1.241
1.26
1.279
V
Input bias current 1
I
B1
0.1
0.2
A
High-level output voltage 1
V
EH1
1.0
1.2
1.4
V
Low-level output voltage 1
V
EL1
0.2
V
Output source current 1
I
SO(FB)1
-
38
-
31
-
24
A
Output sink current 1
I
SI(FB)1
0.5
mA
Error amplifier 2 block
Input threshold voltage 2
V
TH2
1.241
1.26
1.279
V
Input bias current 2
I
B2
0.1
0.2
A
High-level output voltage 2
V
EH2
1.0
1.2
1.4
V
Low-level output voltage 2
V
EL2
0.2
V
Output source current 2
I
SO(FB)2
-
38
-
31
-
24
A
Output sink current 2
I
SI(FB)2
0.5
mA
Error amplifier 3 block
Input offset voltage
V
IO
-
6
6
mV
Common-mode input voltage range
V
ICR
-
0.1
V
CC
V
-
1.4
Input bias current 3
I
B3
-
0.6
-
0.3
A
High-level output voltage 3
V
EH3
1.0
1.2
1.4
V
Low-level output voltage 3
V
EL3
0.2
V
Output source current 3
I
SO(FB)3
-
38
-
31
-
24
A
Output sink current 3
I
SI(FB)3
0.5
mA
Oscillator block
Oscillator frequency
f
OUT
R
T
=
7.5 k
, C
T
=
680 pF
170
190
210
kHz
s
Electrical Characteristics at V
CC
=
2.4 V, C
REF
=
0.1
F, T
a
=
25
C
Voltage Regulators
AN8049SH
5
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Output 1 block
Output duty factor 1
Du
1
R
T
=
7.5 k
, C
T
=
680 pF
80
86
92
%
High-level output voltage 1
V
OH1
I
O
=
-
10 mA, R
B
=
1 k
V
CC
-
1
V
Low-level output voltage 1
V
OL1
I
O
=
10 mA, R
B
=
1 k
0.2
V
Output source current 1
I
SO(OUT)1
V
O
=
0.7 V, R
B
=
1 k
-
34
-
29
-
24
mA
Output sink current 3
I
SI(OUT)1
V
O
=
0.7 V, R
B
=
1 k
40
mA
Pull-down resistor 1
R
O1
17
27
37
k
Output 2 block
Output duty factor 2
Du
2
R
T
=
7.5 k
, C
T
=
680 pF
80
86
92
%
High-level output voltage 2
V
OH2
I
O
=
-
10 mA, R
B
=
1 k
V
CC
-
1
V
Low-level output voltage 2
V
OL2
I
O
=
10 mA, R
B
=
1 k
0.2
V
Output source current 2
I
SO(OUT)2
V
O
=
0.7 V, R
B
=
1 k
-
34
-
29
-
24
mA
Output sink current 2
I
SI(OUT)2
V
O
=
0.7 V, R
B
=
1 k
40
mA
Pull-down resistor 2
R
O2
17
27
37
k
Output 3 block
Output duty factor 3
Du
3
R
T
=
7.5 k
, C
T
=
680 pF
80
86
92
%
Output saturation voltage
V
O(SAT)
I
O
=
40 mA
0.5
V
Output leakage current
I
OLE
V13
=
14 V
1
A
Short-circuit protection circuit block
Input standby voltage
V
STBY
0.1
V
Input threshold voltage
V
THPC
0.8
0.9
1.0
V
Input latch voltage
V
IN
0.1
V
Charge current
I
CHG
V
SCP
=
0 V
-
1.43
-
1.1
-
0.77
A
On/off control block
Input threshold voltage
V
ON(TH)
0.6
0.9
1.2
V
CTL block
Input threshold voltage
V
THCTL
1.07
1.26
1.45
V
Charge current
I
CTL
V
CTL
=
0 V
-
1.43
-
1.1
-
0.77
A
Whole Device
Average consumption current
I
CC(OFF)
R
B
=
9.1 k
, duty
=
50%
4.2
5.5
mA
Standby mode current
I
CC(SB)
1
A
s
Electrical Characteristics at V
CC
=
2.4 V, C
REF
=
0.1
F, T
a
=
25
C (continued)
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