HE9118 Synchronous StepUp
DCDC Converter with PFM Control
Ver13 Mar 222017
Features
 External parts Coil capacitor
 Output voltage Settable to between
21V to 55V in 01V steps
 Maximum Oscillation
frequency 300KHz
 Accuracy of ±2
 High efficiency 95
 Package
SOT23SOT233SOT235SOT89
and TO92
Applications
 Digital cameras
 Electronic notebooks and PDAS
 Portable CDMD players
 Cameras video equipment
 Communications equipment
 Power supply for microcomputers
General Description
The HE9118 Series is a Synchronous step
up DCDC Converter with PFM Control With
the HE9118 Series a stepup switching DC
DC converter can be configured by using
an external coil capacitor The builtin
MOSFET is turned off by a protection circuit
when the voltage at the LX pin exceeds the
limit to prevent it from being damaged
Block Diagram
Order Information
HE9118①②③④⑤
Designator Symbol Description
① A Standard
B Another pin definition
②③ Integer Output Voltage
(21~55) eg30V②：3③：0
④ T PackageTO92
P PackageSOT89
M PackageSOT233
M5 PackageSOT235
N PackageSOT23
⑤ R RoHS Pb Free
G Halogen Free Ver13 Mar 222017
Pin Assignment
Table1 HE9118A series (SOT23SOT233 PKG)
PIN NO PIN NAME FUNCTION
1 VOUT Output voltage pin
2 GND GND pin
3 LX External inductor connection pin
Table2 HE9118A series (SOT235 PKG)
PIN NO PIN NAME FUNCTION
1 EN Shutdown pin
H Normal operation
L Stepup stopped
2 VOUT Output voltage pin
3 NC (NC)
4 GND GND pin
5 LX External inductor connection pin
Table3 HE9118A series (SOT89 PKG)
PIN NO PIN NAME FUNCTION
1 GND GND pin
2 VOUT Output voltage pin
3 LX External inductor connection pin
Table4 HE9118A series (TO92 PKG)
PIN NO PIN NAME FUNCTION
1 GND GND pin
2 VOUT Output voltage pin
3 LX External inductor connection pin
Table3 HE9118B series (TO92PKG and SOT23PKG)
PIN NO PIN NAME FUNCTION
1 VOUT Output voltage pin
2 GND GND pin
3 LX External inductor connection pin
HE9118 Synchronous StepUp
DCDC Converter with PFM Control Ver13 Mar 222017
Marking Rule
① product code B stand for normal pin definition
C stand for different pin definition
② product code 1
③ output voltage code
Symbol Voltage(V) Symbol Voltage(V) Symbol Voltage(V) Symbol Voltage(V)
a 09 A 35 n 22 N 48
b 10 B 36 o 23 O 49
c 11 C 37 P 24 P 50
d 12 D 38 q 25 Q 51
e 13 E 39 r 26 R 52
f 14 F 40 s 27 S 53
g 15 G 41 t 28 T 54
h 16 H 42 u 29 U 55
i 17 I 43 v 30 V 56
j 18 J 44 w 31 W 57
k 19 K 45 x 32 X 58
l 20 L 46 y 33 Y 59
m 21 M 47 z 34 Z 60
④⑤
The last two of them are based on the time of this product which is the first time into production the forth
is the year of this product first time into production such as expressed in 5 in 2015 in 6 in 2016 and
the fifth is the mouth of this product first time into production it can be in 1 ~ 9 which is expressed in 0
in October in November with an A in December with B For example B1y58 represents
HE9116A33NR product is first put into production in August in 2015
HE9118 Synchronous StepUp
DCDC Converter with PFM Control Ver13 Mar 222017
Absolute Maximum Ratings
(Unless otherwise specified Ta25℃)
PARAMETER SYMBOL RATINGS UNITS
VOUT Pin Voltage VOUT VSS03~VSS+8 V
EN Pin Voltage EN VSS03~VSS+8 V
LX Pin Voltage VLX VSS03~VSS+8 V
LX Pin Current ILX 1000 mA
Power
Dissipation
SOT23
PD
250 mW
SOT233SOT235 250 mW
SOT893 500 mW
TO92 500 mW
Operating Temperature TOPR 40~+85 ℃
Storage Temperature TSTG 40~+125 ℃
Soldering Temperature & Time TSOLDER 260℃10s
Note These are stress ratings only Stresses exceeding the range specified under Absolute Maximum
Ratings may cause substantial damage to the device Functional operation of this device at other
conditions beyond those listed in the specification is not implied and prolonged exposure to extreme
conditions may affect device reliability
Electrical Characteristics
(Unless otherwise specifiedTa 25℃)
PARAMETER SYMBOL MIN TYP MAX UNITS CONDITION
Output Voltage VOUT
VOUT(S)
X098
VOUT
VOUT(S)
X102
V
Input Voltage VIN 75 V
Operation Start Voltage VST1 09 V IOUT1mAVOUT22V~42V
Operation Start Voltage VST2 12 V IOUT1mAVOUT42V~55V
Input Current At No Load ISS1 15 uA VIN18V VOUT30V
Current Consumption 2 ISS2 6 10 uA VOUTVOUT(s)+05V
Current Consumption
During Shutdown
ISSS 10 uA VEN0V
Maximum Oscillation
Frequency
fosc 300 KHz
VOUT095xVOUT(s) measure
Waveform at LX pin
Duty Ratio1 Duty1 70 78 85 VOUT095xVOUT(s)
Efficiency EFF1 90
Shutdown Pin Input
Voltage
VSH 075 V
VOUT095xVOUT(s) judge
Oscillation at LX pin
VSL 03 V
VOUT095xVOUT(s) judge
stop at LX pin
Shutdown Pin input
Current
ISH 01 01 uA VEN6V
ISL 01 01 uA VEN0V
Remark VOUT(S) specified above is the set output voltage valueand VOUT is the typical value of the
actual output voltage
HE9118 Synchronous StepUp
DCDC Converter with PFM Control Ver13 Mar 222017
Application Circuits
1) HE9118 without CE
2) HE9118 with CE
Note External Component Recommendation
1) L47uH(Sumida)
2) CF100uF16V(Tantalum)
HE9118 Synchronous StepUp
DCDC Converter with PFM Control Ver13 Mar 222017
TYPICAL PERFORMANCE CHARACTERISTICS
(CinCout100uFL47uH)
HE9118 Synchronous StepUp
DCDC Converter with PFM Control Ver13 Mar 222017
Package Information
3pin SOT23 Outline Dimensions
HE9118 Synchronous StepUp
DCDC Converter with PFM Control Ver13 Mar 222017
3pin SOT233 Outline Dimensions
HE9118 Synchronous StepUp
DCDC Converter with PFM Control Ver13 Mar 222017
5pin SOT235L Outline Dimensions
HE9118 Synchronous StepUp
DCDC Converter with PFM Control Ver13 Mar 222017
3pin SOT893 Outline Dimensions
HE9118 Synchronous StepUp
DCDC Converter with PFM Control Ver13 Mar 222017
3pin TO92 Outline Dimensions
HE9118 Synchronous StepUp
DCDC Converter with PFM Control

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