H8118 Synchronous Step-Up DC-
DC Converter with PFM Control
Features
External parts:Coil,
capacitor
Output voltage: Settable to between
2.1V to 5.5V in 0.1V steps
Maximum Oscillation
frequency :300KHz
Accuracy of
±2%
High efficiency :95%
Package: SOT23-5 and SOT89
Applications
Digital cameras
Electronic notebooks and PDAS
Portable CD/MD players
Cameras , video equipment
Communications equipment
Power supply for microcomputers
General Description
The H8118 Series is a Synchronous step-up
DC/DC Converter with PFM Control.
With the H8118 Series, a step-up switching
DC/DC converter can be configured by using
an external coil, capacitor. The built-in
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
H8118①②③④⑤
Designator
①
②③
④
⑤
SI
Symbol
A
Integer
P
M5
R
G
Description
Standard
Output Voltage(2.1V~5.5V)
e.g:3.3V=②：3；③：3
Package:SOT89
Package:SOT23-5
RoHS / Pb Free
Halogen Free
Ver1.5
PR
1
Shanghai Siproin Microelectronics Co.
O
IN
H8118 Synchronous Step-Up DC-
DC Converter with PFM Control
Pin Assignment
Table1 H8118A series (SOT23-5 PKG)
5
4
PIN NO.
1
PIN NAME
EN
FUNCTION
Shutdown pin
“H”: Normal operation
“L”: Step-up stopped
2
3
VOUT
NC
GND
LX
Output voltage pin
(N.C.)
GND pin
External inductor connection pin
1
2
3
4
5
SOT23-5(Top View)
Table2 H8118A series (SOT89 PKG)
PIN NO.
1
2
1
2
3
3
PIN NAME
GND
O
LX
SYMBOL
V
OUT
EN
V
LX
I
LX
PD
T
OPR
T
STG
T
SOLDER
SOT23-5
SOT-89-3
SOT89(Top View)
Absolute Maximum Ratings
PARAMETER
PR
2
IN
VOUT
RATINGS
V
SS
-0.3~V
SS
+8
V
SS
-0.3~V
SS
+8
V
SS
-0.3~V
SS
+8
1000
250
500
-40~+85
-40~+125
260℃，10s
FUNCTION
GND pin
Output voltage pin
External inductor connection pin
(Unless otherwise specified, Ta=25℃)
UNITS
V
V
V
mA
mW
mW
℃
℃
Dissipation
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.
SI
EN Pin Voltage
LX Pin Voltage
LX Pin Current
Power
Operating Temperature
Storage Temperature
Soldering Temperature & Time
VOUT Pin Voltage
Ver1.5
Shanghai Siproin Microelectronics Co.
H8118 Synchronous Step-Up DC-
DC Converter with PFM Control
Electrical Characteristics
(
Unless otherwise specified，Ta = 25℃)
PARAMETER
Output Voltage
Input Voltage
Operation Start Voltage
Operation Start Voltage
Input Current At No
Load
Current Consumption 2
Current Consumption
During Shutdown
Maximum Oscillation
Frequency
Duty Ratio1
Efficiency
SYMBOL
V
OUT
V
IN
V
ST1
V
ST1
I
SS
MIN
V
OUT(S)
×0.98
-
-
-
-
-
TYP
V
OUT
-
-
-
15
25
6
-
MAX
V
OUT(S)
×1.02
7.5
0.9
1.2
25
35
10
1.0
UNITS
V
V
V
V
uA
uA
uA
uA
CONDITION
-
-
I
OUT
=1mA, V
OUT
=2.2V~4.2V
I
OUT
=1mA, V
OUT
=4.2V~5.5V
V
IN
=1.8V, V
OUT
=3.0V
V
IN
=0.9V, V
OUT
=3.0V
V
OUT
=V
OUT(s)
+0.5V
V
EN
=0V
I
SS2
I
SSS
-
-
fosc
Duty1
EFF1
V
SH
70
300
78
IN
KHz
%
%
V
85
-
-
-
0.3
0.1
0.1
V
uA
uA
-
-
V
OUT
=0.95xV
OUT(s)
, measure
Waveform at LX pin
V
OUT
=0.95xV
OUT(s)
PR
0.75
V
SL1
I
SH
I
SL
-
-0.1
-0.1
O
90
V
OUT
=0.95xV
OUT(s)
, judge
Oscillation at LX pin
V
OUT
=0.95xV
OUT(s)
, judge
stop at LX pin
V
EN
=6V
V
EN
=0V
Shutdown Pin Input
Voltage
Shutdown Pin input
Current
Remark: VOUT(S) specified above is the set output voltage value,and VOUT is the typical value of the
actual output voltage
Application Circuits
1) H8118A without CE
SI
Ver1.5
3
Shanghai Siproin Microelectronics Co.
H8118 Synchronous Step-Up DC-
DC Converter with PFM Control
2) H8118A with CE
Note:External Component Recommendation:
1)
2)
L=47uH(Sumida)
C
F
=47uF/16V(Tantalum)
TYPICAL PERFORMANCE CHARACTERISTICS
(Cin=Cout=100uF,L=47uH)
SI
Ver1.5
PR
4
Shanghai Siproin Microelectronics Co.
O
IN
H8118 Synchronous Step-Up DC-
DC Converter with PFM Control
Package Information
5-pin SOT23-5L Outline Dimensions
SI
Ver1.5
PR
5
Shanghai Siproin Microelectronics Co.
O
IN
电子工程世界
电源技术
