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DC/DC Converter. HT7737S Datasheet

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DC/DC Converter. HT7737S Datasheet






HT7737S Converter. Datasheet pdf. Equivalent




HT7737S Converter. Datasheet pdf. Equivalent





Part

HT7737S

Description

100mA PFM Synchronous Step-up DC/DC Converter



Feature


HT77xxS 100mA PFM Synchronous Step-up DC /DC Converter Features • Low start- up voltage: 0.7V (Typ.) • High effic iency: 1.8V ≤ VOUT ≤ 2.2V upper 80% , 2.7V ≤ VOUT ≤ 5.0V upper 85% (Typ .) • High output voltage accuracy: 2.5% • Output voltage: 1.8V, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V, 5.0V • Outpu t current up to 100mA • Ultra low su pply current IDD: 4μA (Typ.) • Low rip.
Manufacture

Holtek Semiconductor

Datasheet
Download HT7737S Datasheet


Holtek Semiconductor HT7737S

HT7737S; ple and low noise • Low shutdown curr ent: 0.1μA (Typ.) • TO92, SOT89, SO T23 and SOT23-5 package Applications Palmtops/PDAs • Portable communic ators/Smartphones • Cameras/Camcorde rs • Battery-powered equipment Gene ral Description The HT77xxS devices are a high efficiency PFM synchronous step -up DC-DC converter series which are de signed to operate with both wir.


Holtek Semiconductor HT7737S

e wound chip power inductors and also wi th multi-layered chip power inductors. The device series have the advantages o f extremely low start-up voltage as wel l as high output voltage accuracy. Bein g manufactured using CMOS t .


Holtek Semiconductor HT7737S

.

Part

HT7737S

Description

100mA PFM Synchronous Step-up DC/DC Converter



Feature


HT77xxS 100mA PFM Synchronous Step-up DC /DC Converter Features • Low start- up voltage: 0.7V (Typ.) • High effic iency: 1.8V ≤ VOUT ≤ 2.2V upper 80% , 2.7V ≤ VOUT ≤ 5.0V upper 85% (Typ .) • High output voltage accuracy: 2.5% • Output voltage: 1.8V, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V, 5.0V • Outpu t current up to 100mA • Ultra low su pply current IDD: 4μA (Typ.) • Low rip.
Manufacture

Holtek Semiconductor

Datasheet
Download HT7737S Datasheet




 HT7737S
HT77xxS
100mA PFM Synchronous
Step-up DC/DC Converter
Features
• Low start-up voltage: 0.7V (Typ.)
• High efficiency: 1.8V VOUT 2.2V upper 80%,
2.7V VOUT 5.0V upper 85% (Typ.)
• High output voltage accuracy: ±2.5%
• Output voltage: 1.8V, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V,
5.0V
• Output current up to 100mA
• Ultra low supply current IDD: 4μA (Typ.)
• Low ripple and low noise
• Low shutdown current: 0.1μA (Typ.)
• TO92, SOT89, SOT23 and SOT23-5 package
Applications
• Palmtops/PDAs
• Portable communicators/Smartphones
• Cameras/Camcorders
• Battery-powered equipment
General Description
The HT77xxS devices are a high efficiency PFM syn-
chronous step-up DC-DC converter series which are
designed to operate with both wire wound chip power
inductors and also with multi-layered chip power
inductors. The device series have the advantages of
extremely low start-up voltage as well as high output
voltage accuracy. Being manufactured using CMOS
technology ensures ultra low supply current. Because
of their higher operating frequency, up to 500 kHz,
the devices have the benefits of requiring smaller out-
line type lower value external inductors and capaci-
tors. The higher operating frequency also offers the
advantages of much reduced audio frequency noise.
The devices require only three external components
to provide a fixed output voltage of 1.8V, 2.2V, 2.7V,
3.0V, 3.3V, 3.7V or 5.0V.
The HT77xxS devices include an internal oscillator,
PFM control circuit, driver transistor, reference volt-
age unit and a high speed comparator. They employ
pulse frequency modulation techniques, to obtain
minimum supply current and ripple at light output
loading. These devices are available in space saving
TO92, SOT89, SOT23 and SOT23-5 packages. For
SOT23-5 package types, they also include an internal
chip enable function to reduce power consumption
when in the shutdown mode.
Selection Table
Part No.
HT7718S
HT7722S
HT7727S
HT7730S
HT7733S
HT7737S
HT7750S
Output Voltage
1.8V
2.2V
2.7V
3.0V
3.3V
3.7V
5.0V
Note: ″xx″ stands for output voltages.
Package
TO92
SOT89
SOT23
SOT23-5
Marking
HT77xxS (for TO92)
HT77xxS (for SOT89)
7xxS (for SOT23)
7xxS (for SOT23-5)
Rev. 1.50
1 June 25, 2016




 HT7737S
HT77xxS
Block Diagram
LX
VO UT
B u ffe r
P F M C o n tro l
V re f
O S C C h ip E n a b le
VO UT
GND
CE
Pin Assignment
TO 92
S O T89
123
F r o n t V ie w
G N D V O U T LX
1 23
G N D V O U T LX
S O T23
VO UT
3
S O T 2 3 -5
LX
5
GND
4
T o p V ie w
T o p V ie w
12
G N D LX
1 23
CE VO UT NC
B o tto m V ie w
G N D V O U T LX
G N D LX
CE VO UT NC
Pin Description
TO92
2
1
3
Pin No.
SOT89
SOT23
——
23
——
11
32
SOT23-5
1
2
3
4
5
Pin Name
Description
CE
VOUT
NC
GND
LX
Chip enable pin, high active
DC/DC converter output monitoring pin
No connection
Ground pin
Switching pin
Rev. 1.50
2 June 25, 2016




 HT7737S
HT77xxS
Absolute Maximum Ratings
Maximum Input Supply Voltage........................... 6.5V
Ambient Temperature Range ................ -40°C to 85°C
Storage Temperature ........................... -50°C to 125°C
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.
Thermal Information
Symbol
Parameter
θJA
Thermal Resistance (Junction to Ambient)
(Assume no ambient airflow, no heat sink)
PD Power Dissipation
Note: PD is measured at Ta=25°C
Package
SOT89
TO92
SOT23
SOT23-5
SOT89
TO92
SOT23
SOT23-5
Max.
300
300
330
320
0.33
0.33
0.30
0.31
Unit
°C/W
°C/W
°C/W
°C/W
W
W
W
W
Electrical Characteristics
Ta= 25°C; VIN= VOUT×0.6; IOUT= 10mA; unless otherwise specified
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
VIN
ΔVOUT
Input Voltage
Output Voltage Tolerance
— — 6.0 V
-2.5 — +2.5 %
VSTART
VHOLD
Starting Voltage
Voltage Hold
VIN: 0 to 2V, IOUT= 1mA
VIN: 2 to 0V, IOUT= 1mA
— 0.7 0.9 V
— 0.7 —
V
IDD Supply Current
Measured at VOUT pin when VOUT+0.5V —
4
7 μA
ISHDN
VIH
VIL
ILEAK
FOSC
DOSC
η
Shutdown Current
CE High Threshold
CE Low Threshold
LX Leakage Current
Oscillator Frequency
Oscillator Duty Cycle
Efficiency
CE= GND
Add 5.5V at VOUT pin, 4V at LX pin.
Measured at LX pin.
Measured at LX pin when VOUT×0.95
1.8V≤ VOUT≤ 2.2V
2.7V≤ VOUT≤ 5.0V
— 0.1 1.0 μA
1.5 — — V
— — 0.4 V
— 0.05
1
μA
— 500 — kHz
70 80 — %
— 80 — %
— 85 — %
Note: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating
Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific
performance limits. The guaranteed specifications apply only for the test conditions listed.
Rev. 1.50
3 June 25, 2016



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