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INNOTECH
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INN9182
4.3V to 23V Input, 2.3-ASynchronous Step-Down Converter with Fast Transient Response
                                                                                                                                          For details, check for samples:    INN9182 
 
Features
Applications
y W-mode™® Gm Curvature Enables Fast
Transient Response
y 2.3-A Output Current
y High Efficient Integrated FETs Optimized for
portable application:
95m(High side) and 90m(Low side)
y High Efficiency
Up to 96% Efficiency @ 5V Input, 3.3V Output
Up to 94% efficiency @ 12V Input, 3.3V Output
y Wide Input Voltage Range: 4.3V to 23V @ 2.3-A
loading
y Wide Output Voltage Range: 0.923V to 18V @
2.3-A loading ( 36Watt output @max)
y Low Output Ripple and Allows Ceramic Output
Capacitor
y Thermal Shutdown Protection
y 340-KHz Switching Frequency(fsw)
y Cycle By Cycle Over Current Limit
y +/-1.5% High Accuracy Feedback Voltage
y Wide Range of Applications for Low Voltage
System
- Digital TV Power Supply
- High Definition Blu-ray Disc Players
- Networking Home Terminal
- Digital STB
- Ideal for Portable Applications
Descriptions
The INN9182 is a current mode synchronous
buck converter, and has a proprietary W-mode™®
Gm curvature circuit that enables fast transient
response, enables the device to adopt to both low
ESR output capacitors, such as POSCAP or
SP-CAP, and ultra-low ESR ceramic capacitors.
The INN9182 operates from 4.3-V to 23-V Vin
input, and the output voltage can be programmed
between 0.923v to 18v with 2.3A output current,
and +/-1.5% high accuracy output voltage.
Due to 95m(High side) and 90m(Low side)
integrated FETs, the INN9182 works in high
efficiency (up to 94% @12v Input, 3.3v output) .
Typical Application
 
  Input
 
C3    10nF
 
 
C1
10 µF/25V
C  eramic
 
 
R4 100K 2  1 
IN 
7 
EN 
BS 3 
SW 
8  FB  5 
SS COMP  G 
L1 10µH
R1 26.1K
1%
 
C8
0.1µF
 
 
64
C4 
3.3nF
R2    10K
1% 
  R3 
  2.2K 
Output
3.3V 2.3A
Cout
22µF/6.3V
Ceramic
X2
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INNOTECH
 
ORDERING INFORMATION
INN9182
TA
-40to 85
PACKAGE
SOP8
ORDERING PART
NUMBER
INN9182XXX
INN9182XXXX
PIN
8
8
TRANSPORT
MEDIA,
QUANTITY
Tube
Tape and Reel,
2500
ECO PLAN
Green
(RoHS & no Sb/Br)
 
ABOSOLUTE MAXIMUM RATINGS
Over operating free-air temperature range (unless otherwise noted)
ITEMS
NAME
VALUE
IN -0.3 to 24
BS -0.3 to 29
Voltage Range
SW
SW (10 ns transient)
-2 to 24
-2.5 to 25
FB,SS,COMP
-0.3 to 5.5
EN -0.3 to 8
TJ
Operation Junction
-40 to +150
Tstg
Storage temperature
-55 to +150
 
 
DISSIPATION RATINGS 
(2oz. trace and copper pad)
PACKAGE
θJA
θJC
SOP8
90
45
UNIT
V
V
V
V
V
V
UNIT
/W
RECOMMENDED OPERATING CONDITIONS 
Over operating free-air temperature range(unless otherwise noted)
MIN
Voltage
Supply input voltage range
4.3
VBS
-0.1
SS, FB, COMP
-0.1
EN -0.1
G -0.1
TA
Operating free-air temperature
-40
TJ
Operating junction temperature
-40
 
MAX
23
28
5
7.5
+0.1
85
125
UNIT
V
V
V
V
V
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INNOTECH
INN9182
 
ELECTRICAL CHARACTERISTICS 
Over operating free-air temperature range(unless otherwise noted)
VIN=12V, TA=25
PARAMETER
TEST CONDITIONS
Supply Current
Iin Operating-non-switching supply
current
ISDN
Shut Down Supply Current
VFB Feedback Voltage
OVP
Feedback Overvoltage Threshold
Aea Error Amplifier Voltage Gain
Gea Error Amplifier Transconductance
RDS(on)_1 High Side Switch ON Resistance
RDS(on)_2 Low Side Switch ON Resistance
Ileakgae High Side Switch Leakage Current
ILM_H
High Side Switch Current Limit
ILM_L
Low Side Switch Current Limit
Gcs COMP Voltage to Current Sense
Transconductance
Fsw_1
Switching Frequency
Fsw_2
Short Circuit Switching Frequency
Dmax
Maximum Duty Cycle
TON_min Minimum ON Time
VEN_1
EN Threshold Voltage
VHys_1
EN Threshold voltage’s Hysteresis
VEN_2
EN Lockout Threshold Voltage
VHys_2
EN Lockout Hysteresis
VUVLO
Input Under Voltage Lockout
Threshold
VHys_3
Input Under Voltage Lockout
Threshold Hysteresis
Iss Soft-Start Current
Tss Soft-Start Period
TSD
Thermal Shutdown
VIN current, TA=25, EN=1.8V,
VFB=1.0V
VEN=0V
4.3V VIN23V
IC=+/-10µA
VEN=0V, VSW=0V
Minimum Duty Cycle
From Drain to Source
VFB=0V
VFB=1.0V
VEN Rising
VIN Rising
Vss=0V
Css=0.1µF
MIN
MAX
0.900
2.8
1.1
1.8
2.4
TYP
1.3 2.0
24
0.913 0.926
1.1
1000
900
95
90
10
3.5
1.0
3.5
340
100
90
220
1.5 2.0
100
2.0 2.2
210
3.3 4.2
150
6
15
160
UNIT
mA
µA
V
V
V/V
µA/V
m
m
µA
A
A
A/V
KHz
KHz
%
ns
V
mV
V
mV
V
mV
µA
ms
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INNOTECH
TYPICAL PERFORMANCE CHARACTERISTICS
Vin=12V,Vout=3.3V, L=10µH, Cin=10µF, Cout=22µF, TA=+25
Fast Transient Response (20A/µs)
INN9182
Startup through Enable
1A Load Operation
2A Load Operation
Shutdown through Enable
Short Circuit Recovery
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INNOTECH
INN9182
PIN ARRANGEMENT 
 
 
 
BS 1
  8 SS
 
  IN 2
7 EN
 
  SW 3
6 COMP
 
  G4
 
5 FB
 
 
 
 
 
PIN FUNCTIONS 
 
PIN Description
NAME
NO.
Deatails
BS 1
Supply input for high-side NFET gate driver (boost terminal). Connect capacitor from
this pin to SW pin. An internal PN diode is connected between VREG to BS pin.
IN 2 Power input and connected to high side NFET drain
SW 3
Switch node connection between high-side NFET and low-side NFET. Also serve as
inputs to current comparators.
G 4 Signal ground pin, also serve as ground returns for low-side NFET.
FB 5 Converter feedback input. Connect with feedback resistor divider.
COMP
6
Compensation Node. Used to compensate control loop. Connect a series RC
network from COMP to G. In some cases, an additional capacitor is required
EN 7
Enable control input
SS 8
Soft-start control. A external capacitor should be connected to G.
 
 
 
 
 
 
 
 
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