AT1396C | DigiCamel IC Datasheet

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AT1396 ETC1 | Alldatasheet

Document overview

Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
PDF pages: 24

Technical content

Features

95% Efficient possible DC/DC Converter
Combine Step-Up and Step-Down for 90% Efficient Boost-Buck
Bulit-in LED Driver and Open LED Overvoltage Protection
Transformerless Inverting Controller for CCD Bias
2 Channel Built-in MOSFET Current- Mode PWM and 4 Channel Extra PWM Controllers (CH-3 Synchronous Output)
Up to 1MHz Operating Frequency
Shutdown Current <1uA
Built-in Soft-Start Function
Built-in Short-Circuit Protection Function
QFN48 Package

Applications

DSC Power Supply General Description The AT1396A/B/C/D provide a complete power supply solution for digital cameras. They improve performance, component count, and size compared to other multi-channel controllers in 2-cell AA, 1-cell Li-Ion, and dual-battery designs. On-chip MOSFETs provide up to 92~95% efficiency for critical power supplies, while additional channels operate with external FETs for optimum design flexibility. All channels DC/DC operate at one fixed frequency settable from 100KHz to 1MHz to optimize size, cost, and efficiency. Pin Assignment

Ordering Information

Part Number Package Marking AT1396AN QFN48,Green AT1396AN AT1396BN QFN48,Green AT1396BN AT1396CN QFN48,Green AT1396CN AT1396DN QFN48,Green AT1396DN Aimtron reserves the right without notice to change this circuitry and specifications.

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

2 R E V D : 0 5 / 0 5 / 2 3

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

3 R E V D : 0 5 / 0 5 / 2 3

Pin No. Pin name I/O Description

1 SS1 I CH1 Soft-Start Input

2 CTL5 I CH5 Enable Input

3 CTL6 I CH6 Enable Input

4 LXU O Step-Up Converter Switching Node

5 CTLU I CH1 Enable and Chip Enable Input

6 PGND1 P Power Ground

7 PGND2 P Power Ground

8 CTLD I CH2 Enable Input

9 LXD O Step-Down Converter Switching Node

10 CTL3 I CH3 Enable Input

11 CTL4 I CH4 Enable Input

12 SS2 I CH2 Soft-Start Input

13 /SDOK O Open-Drain, Active Low, Power Good for Step-Down

14 CSCP I Short Circuit Protection Input

15 PVCC2 P Step-Down Converter Input

16 COMP2 O Step-Down Converter Compensation Node

17 FBD I Step-Down Converter Feedback Input

18 SS3 I CH3 Soft-Start Input

19 COMP3 O CH3 Compensation Node

20 FB3 I CH3 Feedback Input

21 SS4 I CH4 Soft-Start Input

22 COMP4 O CH4 Compensation Node

23 IN4 I CH4 Negative Feedback Input

24 IP4 I CH4 Positive Feedback Input

25 PVCC3 P CH3 Power

26 OUT3M O CH3 Master Output Driver

27 OUT3S O CH3 Slave Output Driver

28 PGND3 P Power Ground

29 OUT4 O CH4 Output Driver

30 OUT5 O CH5 Output Driver

31 OUT6 O CH6 Output Driver

32 PVCC4 P CH4 Power

33 GND P Power Ground

34 FB5H I CH5 Controller V oltage Feedback Input

35 FB5 I CH5 Controller V oltage Feedback/Current Feedback

36 COMP5 O CH5 Compensation Node

37 VBG O Reference Bypass

38 SS5 I CH5 Soft-Start Input

39 FB6 I CH6 Feedback input

40 COMP6 O CH6 Compensation Node

41 CT O Oscillator Control

42 VREG P Reference Output

43 FBU I Step-Up Converter Input

44 COMP1 O Step-Up Controller Compensation Node

45 VCC P IC power Input

46 PVCC1 P Power Output of the Step-Up Converter

47 SS6 I CH6 Soft-Start Input

48 SEL4 I Configures the CH4 as a Step-Up or Step-Down

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

4 R E V D : 0 5 / 0 5 / 2 3

Storage temperature T STG -55～Ð150 Ċ Operating temperature T OPR -30～Ð85 Ċ PVCC1,PVCC2,PVCC3,PVCC 4 input voltage -0.3～Ð5.5 V LXU,LXD, OUT3M,OUT3S input voltage VLX/OUT -0.3V～+5.5 V Other input Pin -0.3V～+5.5 V LXU Current 3.6 A LXD Current 2.25 A OUT3M,OUT3S Current 200 mA Power consumption Pd 1000 mW ESD Classification 2 KV

Electrical Characteristics

(PVCC1=PVCC2=PVCC3=PVCC4=VCC=3.6V , Ta=+250C) Values Parameter Symbol Condition Min. Typ. Max. Unit GENERAL Input V oltage Range VCC Channel 1 DC/DC 1.2 - 5.5 V CH1,CH2 Switch- Off Input Current IVCC No Switching, FBU=FBD=0.9V CTLU=CTLD=3.6V ,other disable - 1 1.1 mA CH1,CH2, CH3(or 4,5,6) Switch- Off Input Current IVCC No Switching, FBU=FBD=FB3=0.9V CTLU=CTLD=CTL3=3.6V other disable - 1.2 1.3 mA Shutdown Current I VCC All CTL disable - 1 10 ǄA REFERENCE Reference Output V oltage V REG I REG =1mA 2.275 2.30 2.325 V Reference Load Regulation ∆VREG1 1mA< IREG <10mA - 5 10 mV Reference Line Regulation ∆VREG2 2.5<VCC<5.5V - - 5 mV OSC Frequency f OSC CT=82pF - 500 - KHz Frequency variation with Temperature ∆fOSC1 Ta=-20°C ~+85°C - 1 10 %

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

5 R E V D : 0 5 / 0 5 / 2 3

Input V oltage ∆fOSC2 VCC =2.5V~5.5V - 1 5 % CHANNEL 1(STEP-UP) Pre-OSC to OSC Trip Level VCC1 VCC rising edge - 2.45 - V Pre-OSC to OSC Hysteresis ∆VCC1 - 100 - mV Under V oltage Lockout VCC - 2.45 - V Input V oltage Range PVCC1 Channel 1 DC/DC 1.2 - 6.0 V Normal Operating Soft-Start Charge Current ISS1 V CC =2.5V~5.5V 0.8 1 1.5 µA FBU Regulation V oltage V FBU Ta=-20°C ~+85°C 0.784 0.8 0.816 V FBU input Current I FBU FBU=0.8V - - 100 nA Current-Sense Amplifier Transresistance RCS - 0.285 - V/A Transconductance G MEA - 140 - µs Maximum Duty Cycle D MAX FBU=0.7V 85 90 95 % PVCC1 Leakage Current I L1 VLXU=0V ,PVCC1=5.5V - 5 12 µA LX Leakage Current I LX1 VLXU=5.5V - 1 5 µA RN N-Channel - 95 150 mΩ Switch On-Resistance RP P-Channel - 150 250 mΩ N-Channel Current Limit I Limit1 1.8 2.1 2.4 A P-Channel Turn-off Current IREV1 - 20 - mA Startup Current Limit I Limit-s PVCC1=1.5V - 450 - mA Startup Frequency f START PVCC1=1.5V - 200 - KHz CHANNEL 2(STEP-DOWN) Input V oltage Range PVCC2 Channel 2 DC/DC 1.2 - 6.0 V Normal Operating Soft-Start Charge Current ISS2 V CC =2.5V~5.5V 0.8 1 1.5 µA FBD Regulation V oltage V FBD Ta=-20°C ~+85°C 0.784 0.8 0.816 V FBD input Current I FBD FBD=0.8V - - 100 nA Current-Sense Amplifier Transresistance RCS - 0.6 - V/A Transconductance G MEA - 140 - µs Maximum Duty Cycle D MAX FBD=0.7V - 100 - %

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

6 R E V D : 0 5 / 0 5 / 2 3

LX Leakage Current I LX2 VLX=0~3.6V ,PVCC2=3.6V - 1 5 µA RN N-Channel - 95 150 mΩ Switch On-Resistance RP P-Channel - 150 250 mΩ P-Channel Current Limit I Limit2 1.0 1.2 1.4 A N-Channel Turn-off Current IREV2 - 20 - mA /SDOK Output Low V oltage VSDOK 0.1mA into /SDOK - 0.01 0.1 V /SDOK Leakage current I L_SDOK CTLD=0V ,/SDOK=5.5V - 0.1 1 µA CHANNEL 3 Input V oltage Range PVCC3 Channel 3 DC/DC 1.2 - 6.0 V Normal Operating Soft-Start Charge Current ISS3 V CC =2.5V~5.5V 0.8 1 1.5 µA FB3 input Current I FB3 FB3=0.8V - - 100 nA FB3 Regulation V oltage V FB3 Ta=-20°C ~+85°C, FB3=COMP3 0.784 0.8 0.816 V Error Amplifier V oltage Gain A V DC 80 - - dB Error Amplifier Frequency Bandwidth BW A V=0dB - 5 - MHz VOH - 1.0 - V Error Amplifier Output V oltage VOL - 10 - mV Isource COMP=0.8V - -0.5 - mA Error Amplifier Output Source Current Isink COMP=0.8V - 60 - µA Output Source Current Isource DUTY=90%,OUT=1/2VCC - -130 -80 mA Output Sink Current Isink DUTY=0%,OUT=1/2VCC 65 100 - mA ROH OUT=-15mA - 18 30 Ω Output On-Resistor ROL OUT=15mA - 16 25 Ω DMAX Step-Up Mode 85 90 95 % Maximum Duty Cycle DMAX Step-Down Mode - 100 - % CHANNEL 4,5,6

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

7 R E V D : 0 5 / 0 5 / 2 3

Input V oltage Range PVCC4 Channel 4,5,6 DC/DC 1.2 - 6.0 V Normal Operating Soft-Start Charge Current ISS4/5/6 V CC =2.5V~5.5V 0.8 1 1.5 µA FB4/5/6 Regulation V oltage VFB4/5/6 Ta=-20°C ~+85°C, FB_=COMP_ 0.784 0.8 0.816 V FB5 Regulation V oltage for LED Driver VFB5 Ta=-20°C ~+85°C, FB5=COMP5 0.19 0.20 0.21 V FB5H OVP Trip Level V FB5H Ta=-20°C ~+85°C, 0.98 1.00 1.02 V Error Amplifier V oltage Gain A V DC 80 - - dB Error Amplifier Frequency Bandwidth BW A V=0dB - 5 - MHz VOH - 1.0 - V Error Amplifier Output V oltage VOL - 10 - mV Isource COMP=0.8V - -0.5 - mA Error Amplifier Output Source Current Isink COMP=0.8V - 60 - µA DMAX FB_=0.7V 85 90 95 % Maximum Duty Cycle DMAX FB5=0.1V 85 90 95 % Output Source Current Isource DUTY=90%,OUT=1/2VCC - -130 -80 mA Output Sink Current Isink DUTY=0%,OUT=1/2VCC 65 100 - mA ROH OUT=-15mA - 18 30 Ω Output On-Resistor ROL OUT=15mA - 16 25 Ω SHORT CIRCUIT PROTECTION Threshold V oltage VTH CH3,CH4,CH5,CH6 - 0.9 - V CSCP Charge Current ICSCP 0.8 1.0 1.5 µA CONTROL BLOCK VIH PVCC1=VCC=1.5 ~5.5V 1.1 - VCC V CTLU input V oltage VIL PVCC1=VCC=1.5 ~5.5V 0 - 0.5 V VIH PVCC1 , 2=VCC=1.5 ~5.5V CTLD=VIH 1.1 - VCC V CTLD input V oltage VIL PVCC1 , 2=VCC=1.5 ~5.5V CTLD=VIH 0 - 0.5 V

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

8 R E V D : 0 5 / 0 5 / 2 3

VIH PVCC1 , 3=VCC=1.5 ~5.5V CTLU=VIH 1.4 - VCC V CTL3 input V oltage VIL PVCC1 , 3=VCC=1.5 ~5.5V CTLU=VIH 0 - 0.5 V VIH PVCC1 , 4=VCC=1.5 ~5.5V CTLU=VIH 1.4 - VCC V CTL4 , 5 , 6 input V oltage VIL PVCC1 , 4=VCC=1.5 ~5.5V CTLU=VIH 0 - 0.5 V VIH PVCC1 , 4=VCC=1.5 ~5.5V CTLU=CTL4=VIH 1.4 - VCC V SEL4 input V oltage VIL PVCC1 , 4=VCC=1.5 ~5.5V CTLU=CTL4=VIH 0 - 0.5 V

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

9 R E V D : 0 5 / 0 5 / 2 3

C H 1 E f f i c i e n c y V S . L o a d C u r r e n t C H 3 E f f i c i e n c y V S . L o a d C u r r e n t CH1 + CH2 Efficiency VS. Load Current CH2 Efficiency VS. Load Current CH1 + CH2 Efficiency VS. Load Current CH4 , 5 , 6 Efficiency VS. Load Current

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 1 0 R E V D : 0 5 / 0 5 / 2 3 CH4 , 5 , 6 Efficiency VS. Load Current CH4 , 5 , 6 Efficiency VS. Load Current

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 1 1 R E V D : 0 5 / 0 5 / 2 3

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 1 2 R E V D : 0 5 / 0 5 / 2 3 C H 3 S t a r t - U p W a v e f o r m V B A T = 2 . 0 V T i m e : 2 0 m S / D i v C H 3 S t a r t - U p W a v e f o r m V B A T = 3 . 0 V T i m e : 2 0 m S / D i v CH1,CH2,CH3 Start-Up Waveform V B A T = 3 . 0 V T i m e : 5 0 m S / D i v CTL3 , 2V/Div , DC VM=3.3V , 2V/Div , DC IoutM ,100mA/Div , DC IBAT , 1A/Div , DC CTL3 , 2V/Div , DC VM=5.0V , 2V/Div , DC IoutM , 100mA/Div , DC IBAT , 1A/Div , DC CTLU , 2V/Div , DC VM=5V , 5V/Div , DC VDSP_Core=1.8V , 1V/Div , DC VDSP_IO=3.3V , 2V/Div , DC

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 1 3 R E V D : 0 5 / 0 5 / 2 3 CH1 Load Transient Response V B A T = 3 . 0 V T i m e : 1 m S / D i v CH2 Load Transient Response V B A T = 2 . 0 V T i m e : 1 m S / D i v CH3 Load Transient Response V B A T = 3 . 0 V T i m e : 1 m S / D i v VM , 100mV/Div , AC Iout1 , 200mA/Div , DC VDSP_Core , 100mV , AC Iout2 , 100mA/Div , DC VDSP_IO , 100mV/Div , AC Iout3 , 100mA/Div , DC

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 1 4 R E V D : 0 5 / 0 5 / 2 3 Typical Application Circuit Multi-Battery Application

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 1 5 R E V D : 0 5 / 0 5 / 2 3 2-AA Battery Application

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 1 6 R E V D : 0 5 / 0 5 / 2 3 1-Li Battery Application

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 1 7 R E V D : 0 5 / 0 5 / 2 3

Application Information

The AT1396A/B/C/D include 6 channels DC/DC to generate a multiple-output digital camera power-supply system. It include: z Step-Up DC/DC converter with on-chip synchronous MOSFETs.(CH1) z Step-Down DC/DC converter with on-chip synchronous MOSFETs.(CH2) z Main synchronous DC/DC controller can be configured as e ither a Step-Up or Step-Down converter.(CH3) z Selectable DC/DC controller for boost/flyback/buck/inverting converters.(CH4) z White LED driver with open LED protection or boost controller.(CH5) z Boost/flyback controller.(CH6) Step-Up DC/DC Converter (CH1) The step-up DC/DC converter typi cally is used to generate a 5V or the highest of the DSC power system requirement from a 1.5V to 4.2V battery input and self-power the AT1396. The efficiency is up to 95% with an internal MOSFET and external synchronous rectifier. Step-Down DC/DC Converter (CH2) The step-down DC/DC is optimized for ge nerating DSP core voltage (down to 0.8V) at high efficiency. It runs from the vo ltage at PVCC2. This pin can be connected directly to the battery if sufficient headroom exists to avoid dropout. It can be powered from the output of another c onverter (CH1 or CH3) for boost-buck operation. The CH2 also features an open-drain /SDOK output that goes low when the CH2 is in regulation. /SDOK may be used to drive an external P-MOSFET that gates 3.3V power to the DSP after the core voltage is in regulation (Figure 1). The R1,R2 and C1 is for MOSFET soft-start function to avoid the more inrush current . Step-Up or Step-Down DC/DC Converter (CH3) The CH3 can be as a step-up (AT1396B/D) or step-down (AT1396A/C) voltage mode PWM converter. An external MOSFET a nd synchronous rectifie r allow conversion efficiencies as high as 93%. Step-down opera tion can be direct fr om Li-Ion cell if the minimum input voltage exceeds the desire d output by approximately 200mV . When

reduces the available step-up output (CH1) current for other loads. Figure 1. Using /SDOK to drive external MOSFET that gates 3.3V power to DSP after 1.8V core voltage is in regulation

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 1 9 R E V D : 0 5 / 0 5 / 2 3 Auxiliary Controller (CH4,CH5,CH6) The three auxiliary controllers operat e as fixed-frequency voltage-mode PWM controllers. They use the external MOSFE Ts, so output power is determined by external components. All of auxiliary co ntrollers have a guaranteed duty cycle of minimum duty cycle of 85%(boost-type) or 100%(buck/invertin g type). In boost designs that employ continuous current ( CCM), the maximum dut y cycle limits the boost ratio so: With discontinuous inductor current(DCM), no such limit exists for the input/output ratio since the inductor has time to fully discharge before the next cycle begins. The discontinuous conduction mode boost voltage conversion relationship is given by: W h e r e K i s d e f i n e d a s : The CH4 is selectable DC/DC controller for drive N-channel MOSFETs (SEL=high) or P-channel MOSFETs (SEL=low). It can be configure as the inverting circuit (Figure 2), typically for CCD and LCD bias. This is useful in height-Limited designs where transformers may not be desired. The efficiency is more than the charge-pump inversion for some load conditions. The CH5 can be configure as a switching- mode boost current source for white LEDs, FB5(0.2V) provides current-sensing feedbac k, while FB5H(1.0V) provides (optional) open-LED over-voltage protection(Figure 3). If used as a boost converter, FB5H is grounded and FB5(0.8V) is used as the fee dback input. In this case, CH5 behaves exactly like CH4 and CH6. The CH6 can be used for conventional DC/DC boost and flyback designs.(Figure 4 ,Figure 5 and Figure 6) %851 ≤− OUT IN V V STR LK × ×= 2 i O V VM = 411 K D VV iO ×++ ×= )1( −××= MMKD

Figure 6. +15V and –7.5V CCD Bias with Charge-Pump (using AT1202 to regulated the negative output) time Ts(s)(valid threshold 0.3~0.8V interval). Note : It could be disabled soft start function by floating SS pin.

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 2 3 R E V D : 0 5 / 0 5 / 2 3 SCP Protection Setting (CH3~CH6) The CSCP comparator detects CH3,CH4, CH5 and CH6 output voltage while the power converter work at norma l condition. At the same time, the voltage level of CSCP pin is held at low level. If th e output load of these converters rapidly malfunction or short, causing the output voltage to drop, the CSCP comparator detects that to enable short circuit protection. The time period when short circuit protection show as follow equation. Short detection time (T PE(s)) T PE(s) = 0.9 * CCSCP (ǄF) Note : It could be disabled short circuit protection function by connecting CSCP pin into the ground. Determine the triangular Oscillator Frequency The triangular oscillator frequency is determined by the timing capacitor (C T). It is difficult to incorporate these non-linear characteristics into the equation. This difference is caused by characteristics, such as changes in the maximum voltage amplitude of the sawtooth waveform with th e CT value and the circuit delay causing the maximum amplitude to become large in the case of a high oscillating frequency even for the same capacitor. In practical us e, therefore, the user should read the CT values from the characteristic curve or should determine an approximate target value by using the equation. 41000)( pFCKHzf T OSC =

Preliminary Product Information 6-Channel DC-DC Converter for DSC Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 2 4 R E V D : 0 5 / 0 5 / 2 3

Product Information

AT1396C specifications and overview.

Summary

Preliminary Product Information 6-Channel DC-DC Converter for DS

Description

Preliminary Product Information 6-Channel DC-DC Converter for DS

Source title AT1396C Datasheet(PDF) - List of Unclassifed Manufacturers

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