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DA9251.001 25 October, 2001
This is preliminary information on a new product under development. Micro Analog Systems Oy reserves the right to make any changes without notice.
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MAS9251 is a low noise, constant frequency switched capacitor voltage doubler with regulated output. In the adjustable output version an external feedback pin allows the output voltage to be adjusted. The high switching frequency of MAS9251 guarantees low output ripple even with small ceramic capacitors. The shutdown control pin can be used to turn off the device for power saving. MAS9251 is equipped with soft-start feature, which reduces the circuit's disturbance to power supply lines during start-up by limiting the maximum input current. Low operating input voltage and low external part count make MAS9251 ideal for small battery powered portable systems. An internal thermal protection circuit prevents the device from overheating. Also the maximum output current is internally limited.
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* Two versions: Adjustable Output Fixed 5 V Output * Solution without Inductors * Soft-Start * Output Accuracy < 4% * Low External Part Count * Low Noise * Input Voltage Range: 2.7 V... 4.5 V * Shutdown Control * 1 MHz Switching Frequency * Internal Thermal Shutdown * Short Circuit Protection * MSOP-8 and CSP Packages
$33/,&$7,216
* LED Backlighting * White LED Driver * LED Brightness Control * Li-Ion Battery Backup Supplies * Local 3 V to 5 V Conversion * Smart Card Readers * PCMCIA Local 5 V Supplies
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DA9251.001 25 October, 2001
3,1 &21),*85$7,21
MSOP-8
9251
VOUT 1
8 VIN 7 FB / NC 6 CTRL 5 SGND
YWW
C+ 2 C- 3 PGND 4
TOP VIEW
CSP PACKAGE PIN 1 DESIGNATOR C+ VIN PIN 1 VOUT GND CTRL BOTTOM VIEW
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TOP VIEW
C-
Top Marking Information: vz = Product Specific Code, see p.11 Ordering Information (Y)YWW = Year Week XXXXX = Lot Number
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3LQ 1DPH VOUT C+ CPGND SGND CTRL FB VIN 3LQ 1XPEHU LQ 0623- 1 2 3 4 5 6 7 8 3LQ 1XPEHU LQ &63 1 6 4 2 3 5 7\SH O I/O I/O G G I I/O P )XQFWLRQ Regulated Output Voltage Flying Capacitor Positive Terminal Flying Capacitor Negative Terminal Ground for Switching Currents Ground for Analog Blocks Enable/Disable Pin for Charge Pump (Logic 0 = Disable, Logic 1 = Enable) Feedback Input Pin Input Supply Voltage
G = Ground, I = Input, O = Output, P = Power
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DA9251.001 25 October, 2001
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VIN
SOFT START
OUT IN
VOUT C+ C-
VREF
TEMP. PROT.
A B
CTRL SGND
CONTROL LOGIC
CLKGEN 1MHz
PGND
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VIN
FB
SOFT START
OUT IN
VOUT C+ C-
VREF
TEMP. PROT.
A B
CTRL SGND
CONTROL LOGIC
CLKGEN 1MHz
PGND
3 (11)
DA9251.001 25 October, 2001
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All voltages with respect to ground.
3DUDPHWHU Supply Voltage Output Voltage CTRL and FB Input Voltages ESD Rating Junction Temperature Storage Temperature Short Circuit Duration
6\PERO VIN VOUT VCTRL, VFB
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0LQ -0.3 -0.3 -0.3 -0.3
0D[ 6 6 VIN + 0.3 6 2 +175
(limited)
8QLW V V V kV C C s
VIN 5.7 V 5.7 V < VIN 6 V Human Body Model (HBM)
TJmax TS tSC
-55 +150 Indefinite
Stresses beyond those listed may cause permanent damage to the device. The device may not operate under these conditions, but it will not be destroyed.
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All voltages with respect to ground.
3DUDPHWHU Operating Junction Temperature Operating Ambient Temperature Operating Supply Voltage
6\PERO TJ TA VIN
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0LQ -40 -40
7\S
0D[ +125
8QLW C C V
+27 3.6
+85 4.5
Output Voltage
VOUT
For MAS9251AF For MAS9251AS see application information p 7 For adjustable output version
2.7
0.84
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TA = -40C to +85C, typical values at TA = 27C, VIN = 3.6 V, VOUT = 5.0 V, CIN = 1 F, CFLY = 1 F, COUT = 1 F, VCTRL = VIN, unless otherwise specified.
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3DUDPHWHU Output Voltage Tolerance Output Voltage Ripple Feedback Voltage Reference
6\PERO VOUT VR VFB
&RQGLWLRQV VIN = 2.7 V... 4.5 V, IOUT 40 mA VIN = 3.1 V... 4.5 V, IOUT = 100 mA VIN = 3 V, IOUT = 100 mA All conditions (internally controlled reference)
0LQ -4 -4
7\S
0D[ +4 +4
8QLW %VNOM mVP-P V
80 0.84
N &XUUHQW 3DUDPHWHUV
3DUDPHWHU Continuous Output Current Short Circuit Current Feedback Input Current Current Consumption Shutdown Current
6\PERO IOUT ISC IFB ICC ISHDN
&RQGLWLRQV VIN = 3.1 V... 4.5 V VIN = 3.6 V, RL = 0 VFB = 0.84 V IOUT = 0 mA VCTRL = 0 V, VOUT = 0 V TA = +27C TA = +85C
0LQ
7\S
0D[ 100
8QLW mA mA A mA A
300 0.1 4.5 0.01 1 5
4 (11)
DA9251.001 25 October, 2001
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3DUDPHWHU Threshold High Threshold Low
6\PERO TH TL
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0LQ 145 135
7\S 160 150
0D[ 175 165
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The hysteresis of 10 oC prevents the device from turning on too soon after thermal shut-down.
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3DUDPHWHU Shutdown Voltage OFF State ON State Shutdown Control Input Pin Current
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6\PERO VCTRL
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VCTRL = VIN VCTRL = 0 V
4 0
If CTRL-pin is not connected, MAS9251 is in OFF state (900 k pull-down resistor to ground).
3DUDPHWHU Thermal Resistance MSOP-8 (Junction-to-Air) Maximum Power Dissipation
6\PERO RJA Pd
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0LQ
7\S 206.3
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any ambient temperature
Pd MAX =
Note 1
TJ MAX - TA R JA
80
Efficiency
IrA
VIN = 3 V, IOUT = 50 mA
%
: TJ(MAX) denotes maximum operating junction temperature (+125C), TA ambient temperature, and RJA junction-to-air thermal resistance (206.3C/W).
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3DUDPHWHU Start-up Time (from control signal edge to 90% of VNOM) Switching Frequency
6\PERO tstart-up FOSC
&RQGLWLRQV VCTRL = 0 to VIN, VIN = 3 V, IOUT 100 mA
0LQ
7\S 1
0D[
8QLW ms
0.6
1
1.8
MHz
5 (11)
DA9251.001 25 October, 2001
$33/,&$7,21 ,1)250$7,21
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CFLY 1F
3 C6 OFF ON CTRL
2 C+ 1 VOUT VOUT = 5 V
VIN = 2.7 V... 4.5 V
MAS9251AF
8 VIN NC 7 COUT 1F PGND 4 SGND 5
CIN 1F
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CFLY 1F
3 C6 OFF ON CTRL
2 C+ 1 VOUT R1 FB 7 R2 COUT 1F VOUT = (1+R1/R2) * VFB
VIN = 2.7 V... 4.5 V
MAS9251AS
8 VIN
CIN 1F
PGND 4
SGND 5
I 10A
N.B.! The values of R1 and R2 should be selected so that VOUT does not exceed 5.3 V.
3DUDPHWHU Output Capacitance
6\PERO COUT
0LQ 0.47
7\S 1
0D[
8QLW F
1RWH
Low ESR (< 0.1 ) ceramic capacitor recommended, especially with high load current Flying Capacitance CFLY 0.68 1 F Low ESR (< 0.1 ) ceramic capacitor required (note 2) Input Capacitance CIN 0.47 1 F Low ESR (< 0.1 ) ceramic capacitor recommended, especially with high load current Values given on the table are minimum requirements unless otherwise specified. When selecting capacitors, tolerance and temperature coefficient must be considered to make sure that the requirement is met in all potential operating conditions. 1RWH : Polarized capacitor should never be used, since the capacitor voltage can reverse during operation.
6 (11)
DA9251.001 25 October, 2001
$33/,&$7,21 ,1)250$7,21
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6,5 5,5
d W b A W
4,5 3,5 2,5 1,5 2 2,2 2,4 2,6 2,8 3 3,2 3,4 3,6 3,8
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Vout_0 mA Vout_10 mA Vout_50 mA Vout_100 mA
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CFLY 1F
3 100 Hz PWM C6 CTRL
2 C+ 1 VOUT VOUT = VFB + VLED
VIN = 2.7 V... 4.5 V
MAS9251AS
8 VIN FB 7 COUT 1F PGND 4 SGND 5 RS 56 RS 56 RS 56 RS 56 RS 56
CIN 1F
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CFLY 1F
3 100 Hz PWM C6 CTRL
2 C+ 1 VOUT VOUT = 5 V
VIN = 2.7 V... 4.5 V
MAS9251AF
8 VIN NC 7 COUT 1F PGND 4 SGND 5 RS 91 RS 91 RS 91 RS 91 RS 91 RS 91
CIN 1F
7 (11)
DA9251.001 25 October, 2001
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Gage plane E1 E F Land Pattern Recommendation P Q L N e D A2 A1 b
6\PERO A A1 A2 b b1 c c1 D E E1 e F G L (Terminal length for soldering) M N P Q R R1 0LQ 0 0.75 0.22 0.22 0.08 0.08 1RP 0D[ 1.10 0.15 0.95 0.38 0.33 0.23 0.18 8QLW mm mm mm mm mm mm mm mm mm mm mm mm mm mm
R A R1 A
c G A M b1 (b) Section A - A
c1
0.85 0.30
0.40
3.00 BSC 4.90 BSC 3.00 BSC 0.65 BSC 4.8 0.65 0.60
0.80
0.41 1.02 0 0.25 BSC 0.07 0.07 8
mm mm mm mm mm
Dimensions do not include mold or interlead flash, protrusions or gate burrs. All measurement according to JEDEC standard MO-187.
8 (11)
DA9251.001 25 October, 2001
62/'(5,1* ,1)250$7,21
Resistance to Soldering Heat Maximum Reflow Temperature Maximum Number of Reflow Cycles Seating Plane Co-planarity Lead Finish According to RSH test IEC 68-2-58/20 2*220C 235C 2 max 0.08 mm Solder plate 7.62 - 25.4 m, material Sn 85% Pb 15%
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Pin 1 Designator
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8QLW mm mm mm mm mm mm mm mm mm mm mm mm
9 (11)
DA9251.001 25 October, 2001
5((/ 63(&,),&$7,216
W2
A
D
Tape Slot for Tape Start B
C
N
W1
5000 Components on Each Reel Reel Material: Conductive, Plastic Antistatic or Static Dissipative Carrier Tape Material: Conductive Cover Tape Material: Static Dissipative Carrier Tape
Cover Tape End
Start
Trailer
Components
Leader
'LPHQVLRQ A B C D N W 1 (measured at hub) W 2 (measured at hub) Trailer Leader
0LQ 1.5 12.80 20.2 50 12.4 160 390, of which minimum 160 mm of empty carrier tape sealed with cover tape
0D[ 330 13.50
8QLW mm mm mm mm mm mm mm mm mm
14.4 18.4
Weight
1500
g
10 (11)
DA9251.001 25 October, 2001
25'(5,1* ,1)250$7,21
3URGXFW &RGH MAS9251ASMF-T MAS9251ASMS-T MAS9251ACAF-T 3URGXFW Fixed 5 V Output Voltage Charge Pump Adjustable Output Voltage Charge Pump Fixed 5 V Output Voltage Charge Pump 7RS 0DUNLQJ Y] AF (T1) AS (T2) AF 3DFNDJH MSOP-8 MSOP-8 Chip Scale Package (CSP) (to be qualified) &RPPHQWV Tape and Reel Tape and Reel Tape and Reel
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Micro Analog Systems Oy Kamreerintie 2, P.O.Box 51 FIN-02771 Espoo, FINLAND Http://www.mas-oy.com Tel. (09) 80 521 Tel. Int. +358 9 80 521 Telefax +358 9 805 3213 E-mail: info@mas-oy.com
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Micro Analog Systems Oy reserves the right to make changes to the products contained in this data sheet in order to improve the design or performance and to supply the best possible products. Micro Analog Systems Oy assumes no responsibility for the use of any circuits shown in this data sheet, conveys no license under any patent or other rights unless otherwise specified in this data sheet, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Micro Analog Systems Oy makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification.
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