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HT77XX PFM Step-up DC/DC Converter
Features
* Low start-up voltage: 0.7V (Typ.), 0.9V (Max.) * High efficiency: 85% (Typ.), VOUT2.7V * High output voltage accuracy: 2.5% * Output voltage: 1.8V, 2.7V, 3.0V, 3.3V, 3.7V, 5.0V * Ultra low supply current IDD2: 4mA (Typ.) * Low ripple and low noise * Low shutdown current: 0.5mA (Typ.) * TO-92, SOT-89, SOT-23 and SOT-25 package
Applications
* Palmtops/PDAs * Portable communicators/Smartphones * Cameras/Camcorders * Battery-powered equipment
General Description
The HT77XX series is a set of PFM step-up DC/DC converter with high efficiency and low ripple. The series features extremely low start-up voltage and high output voltage accuracy. They require only three external components to provide a fixed output voltage of 1.8V, 2.7V, 3.0V, 3.3V, 3.7V or 5.0V. CMOS technology ensures ultra low supply current and makes them ideal for battery-operated applications powered from one or more cells. The HT77XX consists of an oscillator, a PFM control circuit, a driver transistor, a reference voltage unit, and a high speed comparator. They employ pulse frequency modulation (PFM) for minimum supply current and ripple at light output loading. These devices are available in space saving TO-92, SOT-89, SOT-23 and SOT-25 packages. For SOT-25 package, it also build-in a chip enable function to reduce power consumption during shutdown mode.
Selection Table
Part No. HT7718 HT7727 HT7730 HT7733 HT7737 HT7750 Note: XX stands for output voltages. Only lead free devices are available. # stands for lead free devices. For the TO-92 package, there will be a # mark at the end of the date code. Output Voltage 1.8V 2.7V 3.0V 3.3V 3.7V 5.0V TO-92 SOT-89 SOT-23 SOT-25 HT77XX (for TO-92) HT77XX# (for SOT-89) 77XX# (for SOT-23) 77XX# (for SOT-25) Package Marking
Block Diagram
V re f LX B u ffe r PFM OSC C h ip E n a b le C o n tro l 115kH z GND VOUT
CE
Rev 1.60
1
September 12, 2007
HT77XX
Pin Assignment
T O -9 2 S O T -8 9
S O T -2 3 VOUT 3
S O T -2 5 LX 5 GND 4
H T77XX 1 2 3
F r o n t V ie w
H T77XX# 1 G N D VO U T LX GND 2 VOUT 3
77XX#
T o p V ie w
77XX#
T o p V ie w
1 GND
2 LX
1 CE
2 3 VOUT
LX
NC
B o tto m
V ie w GND GND
VOUT LX
LX
CE
VOUT
NC
Pin Description
Pin No. TO-92 3/4 2 3/4 1 3 SOT-89 3/4 2 3/4 1 3 SOT-23 3/4 3 3/4 1 2 SOT-25 1 2 3 4 5 Pin Name CE VOUT NC GND LX Description Chip enable pin, high active DC/DC converter output monitoring pin No connection Ground pin Switching pin
Absolute Maximum Ratings
Supply Voltage ..............................VSS-0.3V to VSS+7V Operating Temperature ...........................-40C to 85C 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. Storage Temperature ............................-50C to 125C
Thermal Information
Symbol Parameter Thermal Resistance (Junction to Ambient) (Assume no ambient airflow, no heat sink) Package SOT-89 qJA TO-92 SOT-23 SOT-25 SOT-89 PD TO-92 Power Dissipation SOT-23 SOT-25 Note: PD is measured at Ta= 25C Rev 1.60 2 September 12, 2007 0.3 0.31 W W Max. 300 300 330 320 0.33 0.33 Unit C/W C/W C/W C/W W W
HT77XX
Electrical Characteristics
Symbol VIN DVOUT VSTART VHOLD IIN Parameter Input Voltage Output Voltage Tolerance Start-up Voltage (Fig. 1) VIN=VOUT0.6; IOUT=10mA; Ta=25C (Unless otherwise specified) Test Conditions 3/4 3/4 VIN: 0(R)2V; IOUT=1mA Min. 3/4 -2.5 3/4 3/4 3/4 VOUT=1.8V VOUT=2.7V IDD1 Supply Current 1 (Fig. 2) VS=VOUT0.95 Measured at VOUT pin VOUT=3.0V VOUT=3.3V VOUT=3.7V VOUT=5.0V IDD2 ISHDN VIH VIL ILEAK fOSC DOSC h Note: Supply Current 2 (Fig. 2) Shutdown Current CE High Threshold CE Low Threshold LX Leakage Current (Fig. 3) Maximum Oscillator Frequency (Fig. 3) Oscillator Duty Cycle (Fig. 3) VS=VOUT+0.5V Measured at VOUT pin CE=GND 3/4 3/4 VS=VOUT+0.5V, VX=6V Measured at the LX pin VS=VOUT0.95 Measured at LX pin VS=VOUT0.95 Measured at LX pin VOUT1.8V VOUT2.7V 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 2 3/4 3/4 3/4 65 3/4 3/4 Typ. 3/4 3/4 0.7 3/4 10 35 40 45 55 64 85 4 0.5 3/4 3/4 3/4 115 75 80 85 Max. 6 2.5 0.9 0.7 20 50 60 68 81 85 134 7 1 3/4 0.4 0.9 3/4 85 3/4 3/4 mA mA V V mA kHz % mA Unit V % V V mA
Minimum Hold-on Voltage (Fig. 1) VIN: 2(R)0V; IOUT=1mA No-load Input Current (Fig. 1) IOUT=0mA
Efficiency
%
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.
Test Circuit
100mH 1N 5817 V
OUT
V
IN
47mF ( T a n ta lu m )
LX
HT77XX S e r ie s GND
VOUT
100mF ( T a n ta lu m )
V
S
VOUT
HT77XX S e r ie s GND
LX
V
S
VOUT
HT77XX S e r ie s GND
LX 100W
V
X
(F ig . 1 )
(F ig . 2 )
(F ig . 3 )
Rev 1.60
3
September 12, 2007
HT77XX
Typical Performance Characteristics
1 .9 0 1 .8 5
O u tp u t V o lta g e ( V )
2 .8 0 2 .7 5
O u tp u t V o lta g e ( V )
1 .8 0 V 1 .7 5 1 .7 0 1 .6 5 1 .6 0 0
IN
V = 1 .0 V V
IN
IN
= 1 .6 V V = 1 .4 V
2 .7 0 2 .6 5 2 .6 0 2 .5 5 2 .5 0 V
IN
V = 1 .2 V V
IN
IN
= 2 .0 V V IN = 1 . 8 V = 1 .6 V
= 1 .2 V
IN
20
40
60
80
100
120
140
0
20
40
60
80
100
120
140
O u tp u t C u rre n t (m A )
O u tp u t C u rre n t (m A )
HT7718 Output Voltage v.s Output Current
HT7727 Output Voltage v.s Output Current
90% 85% 80% V V V
IN IN
90 85 V
IN
IN
= 2 .0 V V
IN
= 1 .6 V
80
= 1 .8 V
E ffic ie n c y ( % )
75% 70% 65% 60% 55% 0 = 1 .0 V
= 1 .2 V V
IN
E ffic ie n c y ( % )
75 V 70 V 65 60 55 0
IN
IN
= 1 .6 V
= 1 .4 V
= 1 .2 V
20
40
60
80
100
120
140
20
40
60
80
100
120
140
O u tp u t C u rre n t (m A )
O u tp u t C u rre n t (m A )
HT7718 Efficiency v.s Output Current
HT7727 Efficiency v.s Output Current
1 .0 0 .9 0 .8 0 .7 In p u t V o lta g e ( V ) 0 .6 0 .5 0 .4 0 .3 0 .2 0 .1 0 .0 0 2 4 6 8 10 12 14 16 18 20 H o ld - o n
In p u t V o lta g e ( V )
1 .0
S ta rt-u p
0 .9 0 .8 0 .7 0 .6 0 .5 0 .4 0 .3 0 .2 0 .1 0 .0 0 2
S ta rt u p
H o ld o n
4
6
8
10
12
14
16
18
O u tp u t C u rre n t (m A )
O u tp u t C u rre n t (m A )
HT7718 Start-Up& Hold-On Voltage
HT7727 Start-Up& Hold-On Voltage
Rev 1.60
4
September 12, 2007
HT77XX
3 .0 2 3 .0 0 2 .9 8 2 .9 6 O u tp u t V o lta g e ( V ) 2 .9 4 2 .9 2 2 .9 0 2 .8 8 2 .8 6 2 .8 4 2 .8 2 2 .8 0 0 20 40 60 80 100 120 140 V
IN
3 .4 V V = 1 .2 V V
IN IN IN
= 2 .0 V = 1 .8 V O u tp u t V o lta g e ( V )
3 .3 V V
IN
IN
= 2 .0 V V
IN
3 .2 3 .1 3 .0 2 .9 2 .8 2 .7 2 .6 2 .5 0 20 40
IN
= 1 .8 V
= 1 .5 V
= 1 .2 V
V
= 1 .5 V
O u tp u t C u rre n t (m A )
60 80 100 O u tp u t C u rre n t (m A )
120
140
HT7730 Output Voltage v.s Output Current
HT7733 Output Voltage v.s Output Current
90
85 80 75 V E ffic ie n c y ( % ) 70 65 V 60 55 50 0 V V
IN IN IN
= 2 .0 V = 1 .8 V = 1 .5 V E ffic ie n c y ( % )
85 80 75 70 65 60 55 V
IN
V V = 1 .2 V V
IN IN
IN
= 2 .0 V
= 1 .8 V
= 1 .5 V
IN
= 1 .2 V
20
40
60 80 100 O u tp u t C u rre n t (m A )
120
140
50 0
20
40
60
80
100
120
140
O u tp u t C u rre n t (m A )
HT7730 Efficiency v.s Output Current
1 .1 1 .0 0 .9 0 .8 In p u t V o lta g e ( V ) In p u t V o lta g e ( V ) 0 .7 0 .6 0 .5 0 .4 0 .3 0 .2 0 .1 0 .0 0 2 4 6 8 10 12 14 16 18 20 H o ld o n S ta rt u p 1 .0 0 .9 0 .8 0 .7 0 .6 0 .5 0 .4 0 .3 0 .2 0 .1 0 .0 0
HT7733 Efficiency v.s Output Current
S ta rt u p
H o ld o n
O u tp u t C u rre n t (m A )
2
4
6
8
10
12
14
16
18
20
O u tp u t C u rre n t (m A )
HT7730 Start-Up& Hold-On Voltage
HT7733 Start-Up& Hold-On Voltage
Rev 1.60
5
September 12, 2007
HT77XX
4 .0 3 .9 3 .8 3 .7 3 .6 O u tp u t V o lta g e ( V ) 3 .5 3 .4 3 .3 3 .2 3 .1 3 .0 2 .9 2 .8 2 .7 2 .6 2 .5 0 20 40 60 80 100 120 140 V
IN
5 .5 V V
IN IN
= 3 .0 V = 1 .5 V V
IN
5 .0 = 2 .2 V O u tp u t V o lta g e ( V ) 4 .5 4 .0 3 .5 3 .0 2 .5 2 .0 1 .5 0 20 40 60 80 V V
IN
V
IN
= 3 .0 V V
IN
= 2 .0 V
= 1 .5 V
= 1 .2 V
IN
= 1 .2 V
100
120
140
O u tp u t C u rre n t (m A )
O u tp u t C u rre n t (m A )
HT7737 Output Voltage v.s Output Current
90 85 80 V 75 E ffic ie n c y ( % ) E ffic ie n c y ( % ) 70 V V
IN IN
HT7750 Output Voltage v.s Output Current
V
IN
= 3 .0 V = 2 .2 V
100 90 V V 80
IN
IN
= 3 .0 V = 2 .0 V
IN
= 1 .5 V
70 60 V 50 40 30 20 0 20 40 60 80
IN
IN
65 60 55 50 45 40 0 20 40 60 80 100 120 140 = 1 .2 V
V = 1 .2 V
= 1 .5 V
100
120
140
O u tp u t C u rre n t (m A )
O u tp u t C u rre n t (m A )
HT7737 Efficiency v.s Output Current
HT7750 Efficiency v.s Output Current
1 .1 1 .0 0 .9 0 .8 In p u t V o lta g e ( V ) S ta rt u p
1 .8 1 .6 1 .4 In p u t V o lta g e ( V ) 1 .2 1 .0 0 .8 0 .6 0 .4 0 .2
0 2 4 6 8 10 12 14 16 18 20
0 .7 0 .6 0 .5 0 .4 0 .3 0 .2 0 .1 0 .0 H o ld o n
S ta rt u p
H o ld o n
0 .0 0
2
4
6
8
10
12
14
16
18
20
O u tp u t C u rre n t (m A )
O u tp u t C u rre n t (m A )
HT7737 Start-Up& Hold-On Voltage
HT7750 Start-Up& Hold-On Voltage
Rev 1.60
6
September 12, 2007
HT77XX
HT7718 Load Transient Response (L=100mH, COUT=100mF, VIN=1.08V)
HT7733 Load Transient Response (L=100mH, COUT=100mF, VIN=1.98V)
HT7727 Load Transient Response (L=100mH, COUT=100mF, VIN=1.62V)
HT7737 Load Transient Response (L=100mH, COUT=100mF, VIN=2.22V)
V
OUT
5 0 m V /d iv
50m A
L o a d S te p 2 0 m A /d iv
HT7730 Load Transient Response (L=100mH, COUT=100mF, VIN=1.8V)
HT7750 Load Transient Response (L=100mH, COUT=100mF, VIN=3V)
Rev 1.60
7
September 12, 2007
HT77XX
V
OUT
2 0 m V /d iv
V
OUT
2 0 m V /d iv
V
IN
V
IN
1 V /d iv
1 V /d iv
HT7733 Line Transient Response (L=100mH, COUT=100mF)
HT7750 Line Transient Response (L=100mH, COUT=100mF)
Rev 1.60
8
September 12, 2007
HT77XX
Application Circuits
Without CE Pin
100mH 1N 5817 V
OUT
V
IN
4 7 m F ( T a n ta lu m )
LX
HT77XX S e r ie s GND
VOUT
1 0 0 m F ( T a n ta lu m )
With CE Pin
100mH 1N 5817 V
OUT
V
IN
4 7 m F ( T a n ta lu m )
LX CE
HT77XX S e r ie s GND
VOUT
1 0 0 m F ( T a n ta lu m )
100mH
1N 5817 V
OUT
V
IN
4 7 m F ( T a n ta lu m )
LX CE
HT77XX S e r ie s GND
VOUT
1 0 0 m F ( T a n ta lu m )
Note:
For the SOT-25 package, when CE is pulled low, the internal blocks of the device, such as the reference band gap, gain block, and all feedback and control circuitry will be switched off. The boost converters output, VOUT, will be at a value one Schottky diode voltage drop below the input voltage and the LX pin remains in a high impedance condition. The output capacitor and load at VOUT determine the rate at which VOUT decays.
Rev 1.60
9
September 12, 2007
HT77XX
Package Information
3-pin TO-92 Outline Dimensions
A
B
D C
E F G H
Symbol A B C D E F G H I a
Dimensions in mil Min. 170 170 500 11 90 45 45 130 8 4 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 Max. 200 200 3/4 20 110 55 65 160 18 6
Rev 1.60
10
September 12, 2007
HT77XX
3-pin SOT-89 Outline Dimensions
A B
I J
E
C
D
G F H
Symbol A B C D E F G H I J
Dimensions in mil Min. 173 64 90 35 155 14 17 3/4 55 14 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 59 3/4 3/4 Max. 181 72 102 47 167 19 22 3/4 63 17
Rev 1.60
11
September 12, 2007
HT77XX
3-pin SOT-23 Outline Dimensions
D
C
L
E
H
e
A2 b A1
A
Symbol A A1 A2 b C D E e H L q
Dimensions in mm Min. 1 3/4 0.7 0.35 0.1 2.7 1.4 3/4 2.6 0.37 1 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 1.9 3/4 3/4 3/4 Max. 1.3 0.1 0.9 0.5 0.25 3.1 1.8 3/4 3 3/4 9
Rev 1.60
12
q
September 12, 2007
HT77XX
5-pin SOT-25 Outline Dimensions
D
C
L
E
H
e
A2 b A1
A
Symbol A A1 A2 b C D E e H L q
Dimensions in mm Min. 1.00 3/4 0.70 0.35 0.10 2.70 1.40 3/4 2.60 0.37 1 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 1.90 3/4 3/4 3/4 Max. 1.30 0.10 0.90 0.50 0.25 3.10 1.80 3/4 3 3/4 9
Rev 1.60
13
q
September 12, 2007
HT77XX
Product Tape and Reel Specifications
TO-92 Reel Dimensions (Unit: mm)
P ackage U p, 30
F la t S id e U p
P ackage U p,
F la t S id e D o w n
58 88 360
43
Rev 1.60
14
September 12, 2007
HT77XX
SOT-89, SOT-23 & SOT-25 Reel Dimensions
T2 D
A
B
C
T1
SOT-89 Symbol A B C D T1 T2 SOT-23 Symbol A B C D T1 T2 SOT-25 Symbol A B C D T1 T2 Description Reel Outer Diameter Reel Inner Diameter Spindle Hole Diameter Key Slit Width Space Between Flange Reel Thickness Dimensions in mm 1781.0 621.0 13.00.2 2.50.25 8.4+1.5 -0.0 11.4+1.5 Description Reel Outer Diameter Reel Inner Diameter Spindle Hole Diameter Key Slit Width Space Between Flange Reel Thickness Dimensions in mm 1781 621 130.2 2.50.25 8.4+1.5 11.4+1.5 Description Reel Outer Diameter Reel Inner Diameter Spindle Hole Diameter Key Slit Width Space Between Flange Reel Thickness Dimensions in mm 1801.0 621.5 12.75+0.15 1.90.15 12.4+0.2 17-0.4
Rev 1.60
15
September 12, 2007
HT77XX
TO-92 Carrier Tape Dimensions
P Dh
H1 H H0 l1
W2 W0 t W1 W
F1 P2 P0
F2 D0
TO-92 Symbol I1 P P0 P2 F1 F2 Dh W W0 W1 W2 H0 H1 D0 t H Note: Description Taped Lead Length Component Pitch Perforation Pitch Component to Perforation (Length Direction) Lead Spread Lead Spread Component Alignment Carrier Tape Width Hold-down Tape Width Perforation Position Hold-down Tape Position Lead Clinch Height Component Height Perforation Diameter Taped Lead Thickness Component Base Height Dimensions in mm (2.5) 12.71.0 12.70.3 6.350.4 2.5+0.4 -0.1 2.5+0.4 -0.1 00.1 18.0+1.0 -0.5 6.00.5 9.00.5 (0.5) 16.00.5 Less than 24.7 4.00.2 0.70.2 19.00.5
Thickness less than 0.380.05mm~0.5mm P0 Accumulated pitch tolerance: 1mm/20pitches. ( ) Bracketed figures are for reference only.
Rev 1.60
16
September 12, 2007
HT77XX
SOT-89, SOT-23 & SOT-25 Carrier Tape Dimensions
D
E F W C
P0
P1
t
B0
D1
P
K0 A0
SOT-89 Symbol W P E F D D1 P0 P1 A0 B0 K0 t C SOT-23 Symbol W P E F D D1 P0 P1 A0 B0 K0 t C Description Carrier Tape Width Cavity Pitch Perforation Position Cavity to Perforation (Width Direction) Perforation Diameter Cavity Hole Diameter Perforation Pitch Cavity to Perforation (Length Direction) Cavity Length Cavity Width Cavity Depth Carrier Tape Thickness Cover Tape Width Dimensions in mm 80.3 4 1.75 3.50.05 1.5+0.1 1.5+0.1 4 2 3.15 3.2 1.4 0.20.03 5.3 Description Carrier Tape Width Cavity Pitch Perforation Position Cavity to Perforation (Width Direction) Perforation Diameter Cavity Hole Diameter Perforation Pitch Cavity to Perforation (Length Direction) Cavity Length Cavity Width Cavity Depth Carrier Tape Thickness Cover Tape Width Dimensions in mm 12.0+0.3 -0.1 8.00.1 1.750.1 5.50.05 1.5+0.1 1.5+0.1 4.00.1 2.00.10 4.80.1 4.50.1 1.80.1 0.300.013 9.3
Rev 1.60
17
September 12, 2007
HT77XX
SOT-25 Symbol W P E F D D1 P0 P1 A0 B0 K0 t C Description Carrier Tape Width Cavity Pitch Perforation Position Cavity to Perforation (Width Direction) Perforation Diameter Cavity Hole Diameter Perforation Pitch Cavity to Perforation (Length Direction) Cavity Length Cavity Width Cavity Depth Carrier Tape Thickness Cover Tape Width Dimensions in mm 8.00.3 4.0 1.75 3.50.05 1.5+0.1 1.5+0.1 4.0 2.0 3.15 3.2 1.4 0.200.03 5.3
Rev 1.60
18
September 12, 2007
HT77XX
Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan Tel: 886-3-563-1999 Fax: 886-3-563-1189 http://www.holtek.com.tw Holtek Semiconductor Inc. (Taipei Sales Office) 4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan Tel: 886-2-2655-7070 Fax: 886-2-2655-7373 Fax: 886-2-2655-7383 (International sales hotline) Holtek Semiconductor Inc. (Shanghai Sales Office) 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China 200233 Tel: 86-21-6485-5560 Fax: 86-21-6485-0313 http://www.holtek.com.cn Holtek Semiconductor Inc. (Shenzhen Sales Office) 5/F, Unit A, Productivity Building, Cross of Science M 3rd Road and Gaoxin M 2nd Road, Science Park, Nanshan District, Shenzhen, China 518057 Tel: 86-755-8616-9908, 86-755-8616-9308 Fax: 86-755-8616-9722 Holtek Semiconductor Inc. (Beijing Sales Office) Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031 Tel: 86-10-6641-0030, 86-10-6641-7751, 86-10-6641-7752 Fax: 86-10-6641-0125 Holtek Semiconductor Inc. (Chengdu Sales Office) 709, Building 3, Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China 610016 Tel: 86-28-6653-6590 Fax: 86-28-6653-6591 Holtek Semiconductor (USA), Inc. (North America Sales Office) 46729 Fremont Blvd., Fremont, CA 94538 Tel: 1-510-252-9880 Fax: 1-510-252-9885 http://www.holtek.com
Copyright O 2007 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holteks products are not authorized for use as critical components in life support devices or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
Rev 1.60
19
September 12, 2007

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